Journal articles on the topic 'Degree Discipline: Marine Biology'
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Dubynin, Alexander. "Conservation Biology as an Academic Discipline: Novosibirsk State University’s Master’s Degree Program Experience." BIO Web of Conferences 38 (2021): 00027. http://dx.doi.org/10.1051/bioconf/20213800027.
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A reduction in the planet’s biodiversity requires an active response by politicians, environmental activists, and scientists. Modern biological education should provide an opportunity to acquire the knowledge and skills necessary to solve complex tasks targeted at preserving and restoring vulnerable species habitats and ecosystems. Students study conservation biology at many universities around the world with this as their goal. For the first time in Russia, a Master’s Conservation Biology course for biology students was developed and tested at Novosibirsk State University. This primer course (108 hours) includes lectures, discussions, excursions, elements of gamification, combines auditorium and online classes, uses social networks for additional communication with students, and experienced practitioners. The course has been highly rated by students and can be expanded to include a larger audience.
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Borucinsky, Mirjana, and Boris Pritchard. "Lexical bundles in maritime texts." ICAME Journal 46, no. 1 (August 1, 2022): 5–17. http://dx.doi.org/10.2478/icame-2022-0001.
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Abstract Lexical bundles are recurring frequent word combinations. Research has shown that lexical bundles vary in genre and register (Biber 2006; Biber, Conrad and Cortes 2004; Hyland 2008a, 2008b; Scott and Tribble 2006). However, the degree to which they vary by discipline remains inconclusive. The main aim of this paper is to establish whether lexical bundles are discipline specific, i.e., whether each discipline draws on a specialized lexical repertoire or whether there is a core vocabulary shared across various disciplines. For that purpose, maritime texts covering the subdomains marine engineering, navigation, maritime law and shipping have been collected so as to investigate the structure and function of lexical bundles and to find out how they shape meaning in specialized discourse. For the purposes of the study, a 7.4 M corpus consisting of two monolingual subcorpora and one bilingual subcorpus was compiled. This corpus can be used as a basis for further studies in the field. Furthermore, the paper discusses problems encountered while extracting N-grams from a corpus, as well as classification criteria for the identification of lexical bundles. The results show that lexical bundles identified in maritime texts are phrasal rather than clausal. The results also indicate that lexical bundles are discipline specific. Teaching these specialized features that shape discourse can improve students’ language production and should thus be the focus of instruction in ESP.
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Lercari, Diego. "Analysis of three decades of research in marine sciences in Uruguay through mapping of science and bibliometric indexes." Latin American Journal of Aquatic Research 49, no. 1 (March 1, 2021): 1–17. http://dx.doi.org/10.3856/vol49-issue1-fulltext-2584.
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Uruguay has recently expanded its Exclusive Economic Zone (EEZ), having more aquatic sovereignty than terrestrial territories. In this country, various State institutions have carried out the study of marine science for several decades, but their academic development has not been analyzed. The formal evaluation of scientific research represents a crucial opportunity to define long-term policies requiring greater knowledge of the territory and its resources. In this context, this work carries out a systematic and quantitative review of Uruguay authors' international publications over three decades. The productivity indicators trend is evaluated concerning context variables, predominant research topics are identified, and collaboration networks are characterized. We collected and analyzed data on marine science articles in which an author or co-author is affiliated to an institution in Uruguay from 1990 to 2018 using the Scopus database. It was found that scientific activity measured by a bibliographic analysis showed an increase in the number of articles, authors, and research topics but nowadays show signs of stagnation. Moreover, specific indicators show a great degree of centralism (institutional and authorial), low dynamism, and decreased international collaboration. The largest academic capacities are focused in specific biological disciplines, with little physics and almost nil in geology and chemistry. Decentralization and strengthening sectorial funding for marine science will boost Uruguay's discipline for facing future challenges.
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Wang, Shuhong, Lu Xing, and Hanxue Chen. "Impact of marine industrial structure on environmental efficiency." Management of Environmental Quality: An International Journal 31, no. 1 (January 13, 2020): 111–29. http://dx.doi.org/10.1108/meq-06-2019-0119.
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Purpose Recently, China has been paying increasing attention to how to improve the efficiency of the marine environment and realize a green and sustainable development of the marine economy. Consequently, the industrial structure is crucial to improving efficiency. The purpose of this paper is to introduce environmental factors into the efficiency analysis framework and explore the relationship between marine industrial structure and marine environmental efficiency. Design/methodology/approach This paper uses marine economic data under the DEA-BBC model to measure the marine environmental efficiency of provinces and cities and classifies them by cluster analysis. Then, the marine industrial structure and marine environmental efficiency are studied by an econometric model with human capital, ownership structure, land economic development level, scientific research input and government intervention degree as control variables. Findings The overall level of marine environmental efficiency is relatively low in China, increasing and then decreasing over the research period. The rationalization of industrial structure and scientific research input have significant promoting effects on marine environmental efficiency, while the degree of government intervention has a significant inhibiting effect. The positive effect of human capital on efficiency depends on whether it can be successfully converted into productivity. The effects of industrial structure advancement, ownership structure and land economic development level of on the marine environmental efficiency are mixed. Originality/value The results provide a theoretical and decision-making basis for China to transform and upgrade its marine industrial structure and sustainably develop the marine economy.
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Krasko, Anatoli, Heinz C. Schröder, Sanja Perovic, Renate Steffen, Michael Kruse, Willi Reichert, Isabel M. Müller, and Werner E. G. Müller. "Ethylene Modulates Gene Expression in Cells of the Marine SpongeSuberites domunculaand Reduces the Degree of Apoptosis." Journal of Biological Chemistry 274, no. 44 (October 29, 1999): 31524–30. http://dx.doi.org/10.1074/jbc.274.44.31524.
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Mann, Danny, and Jason Morrison. "Are there curricular differences between biology-based and application-based "bio" engineering disciplines?" Canadian Biosystems Engineering 63, no. 1 (December 31, 2021): 9.19–9.29. http://dx.doi.org/10.7451/cbe.2021.63.9.19.
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Several authors have previously promoted the transformation of the application-based agricultural engineering discipline into a biology-based biological engineering discipline. A systematic analysis of titles for courses being taught by ASABE-umbrella programs across North America was undertaken to identify curricular differences between biology-based and application-based “bio” engineering disciplines. Based on 44 ASABE-umbrella programs analyzed, the four most commonly used program names were biological engineering (25%), biosystems engineering (20%), biological systems engineering (15.9%) and agricultural engineering (13.6%). Definitions of these four program names were reviewed; biosystems, biological systems and agricultural engineering are typically defined such that they are best described as application-based “bio” engineering disciplines while biological engineering is best described as a biology-based engineering discipline. Based on statistical analysis of the frequency of words in course titles, there was a significant increase in the usage of the word “food” and a lack of the word “project” in the course titles within biological engineering programs. Over half of the unique options were found in biological engineering programs suggesting that they do offer unique course content compared with biosystems, biological systems and agricultural engineering degree programs, however, it is noteworthy that four options appear across all four degrees. It is concluded that there are curricular differences between biology-based and application-based “bio” engineering disciplines, however, the curricular differences are not as substantive as one might conclude from the philosophical discussions in the literature. Alternatively, it may simply not be possible to detect curricular differences solely from an analysis of the course titles
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Kriangwanich, Wannapimol, Kittisak Buddhachat, Anocha Poommouang, Siriwadee Chomdej, Chatchote Thitaram, Patcharaporn Kaewmong, Kongkiat Kittiwattanawong, and Korakot Nganvongpanit. "Feasibility of melting fingerprint obtained from ISSR-HRM curves for marine mammal species identification." PeerJ 9 (June 25, 2021): e11689. http://dx.doi.org/10.7717/peerj.11689.
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Currently, species identification of stranded marine mammals mostly relies on morphological features, which has inherent challenges. The use of genetic information for marine mammal species identification remains limited, therefore, new approaches that can contribute to a better monitoring of stranded species are needed. In that context, the ISSR-HRM method we have proposed offers a new approach for marine mammal species identification. Consequently, new approaches need to be developed to identify individuals at the species level. Eight primers of the ISSR markers were chosen for HRM analysis resulting in ranges of accuracy of 56.78–75.50% and 52.14–75.93% in terms of precision, while a degree of sensitivity of more than 80% was recorded when each single primer was used. The ISSR-HRM primer combinations revealed a success rate of 100% in terms of discrimination for all marine mammals included in this study. Furthermore, ISSR-HRM analysis was successfully employed in determining marine mammal discrimination among varying marine mammal species. Thus, ISSR-HRM analysis could serve as an effective alternative tool in the species identification process. This option would offer researchers a heightened level of convenience in terms of its performance and success rate. It would also offer field practice to veterinarians, biologists and other field-related people a greater degree of ease with which they could interpret results when effectively classifying stranded marine mammals. However, further studies with more samples and with a broader geographical scope will be required involving distinct populations to account for the high degree of intraspecific variability in cetaceans and to demonstrate the range of applications of this approach.
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Vanbeselaere, Jorick, Chunsheng Jin, Barbara Eckmair, Iain B. H. Wilson, and Katharina Paschinger. "Sulfated and sialylated N-glycans in the echinoderm Holothuria atra reflect its marine habitat and phylogeny." Journal of Biological Chemistry 295, no. 10 (January 22, 2020): 3159–72. http://dx.doi.org/10.1074/jbc.ra119.011701.
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Among the earliest deuterostomes, the echinoderms are an evolutionary important group of ancient marine animals. Within this phylum, the holothuroids (sea cucumbers) are known to produce a wide range of glycoconjugate biopolymers with apparent benefits to health; therefore, they are of economic and culinary interest throughout the world. Other than their highly modified glycosaminoglycans (e.g. fucosylated chondroitin sulfate and fucoidan), nothing is known about their protein-linked glycosylation. Here we used multistep N-glycan fractionation to efficiently separate anionic and neutral N-glycans before analyzing the N-glycans of the black sea cucumber (Holothuria atra) by MS in combination with enzymatic and chemical treatments. These analyses showed the presence of various fucosylated, phosphorylated, sialylated, and multiply sulfated moieties as modifications of oligomannosidic, hybrid, and complex-type N-glycans. The high degree of sulfation and fucosylation parallels the modifications observed previously on holothuroid glycosaminoglycans. Compatible with its phylogenetic position, H. atra not only expresses vertebrate motifs such as sulfo– and sialyl–Lewis A epitopes but displays a high degree of anionic substitution of its glycans, as observed in other marine invertebrates. Thus, as for other echinoderms, the phylum- and order-specific aspects of this species' N-glycosylation reveal both invertebrate- and vertebrate-like features.
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Chan, Joe, My Svensson, Trond Jenssen, Erik B. Schmidt, and Ivar A. Eide. "Marine n-3 fatty acid consumption in a Norwegian renal transplant cohort: Comparison of a food frequency questionnaire with plasma phospholipid marine n-3 levels." PLOS ONE 15, no. 12 (December 17, 2020): e0244089. http://dx.doi.org/10.1371/journal.pone.0244089.
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Background High levels of plasma marine n-3 fatty acids (n-3FAs) are associated with improved patient and graft survival in renal transplant recipients (RTRs). The aim of this study was to evaluate the utility of a new food frequency questionnaire (FFQ) to estimate marine n-3FA consumption in future epidemiological research. Methods We developed an FFQ with a simple design of 10 questions to assess intake of marine sources of n-3FAs. RTRs included in the recent ORENTRA trial (n = 132) completed the study FFQ at the baseline visit eight weeks after engraftment and at the end of study visit one year post-transplant. We measured the reference biomarker plasma phospholipid (PL) marine n-3FA levels by gas chromatography at the same time points to evaluate association and degree of agreement between FFQ based marine n-3FA consumption estimates and the biomarker. Results The median plasma PL marine n-3FA level was 6.0 weight percentage (wt)% (interquartile range [IQR] 4.7 to 7.3) at baseline and 6.3 wt% (IQR 4.8 to 7.4) at end of study. Median FFQ based marine n-3FA consumption estimates were 22.8 g/month (IQR 13.0 to 34.0) at baseline and 20.3 g/month (IQR 14.5 to 32.3) at end of study. FFQ based marine n-3FA consumption estimates showed a moderate correlation with plasma PL marine n-3FA levels at baseline (Spearman’s correlation coefficient rs = 0.43, p<0.001) and a stronger correlation at end of study (rs = 0.62, p<0.001). Bland Altman plots showed a reasonable degree of agreement between the two methods at both time points. Conclusions Marine n-3FA consumption estimates based on the FFQ showed a moderate correlation with the reference biomarker plasma PL marine n-3FA levels. The FFQ might be useful in epidemiological studies where resources are limited.
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Arheden, Håkan. "Clinical physiology: a successful academic and clinical discipline is threatened in Sweden." Advances in Physiology Education 33, no. 4 (December 2009): 265–67. http://dx.doi.org/10.1152/advan.00072.2009.
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Clinical physiologists in Sweden are physicians (the majority with a PhD degree) with thorough training in system physiology and pathophysiology. They investigate patients in a functional approach and are engaged in basic and applied physiology teaching and research. In 1954, clinical physiology was founded as an independent academic and clinical discipline by the Swedish government to ensure “contact between routine clinical work and the scientific progression.” Up until 2008, clinical physiology was an independent clinical discipline but was then made a subdiscipline to radiology, a fundamentally different discipline. Individuals wishing to become clinical physiologists are required to be trained and certified as European radiologists, after which training and certification as clinical physiologists may be pursued. This means that radiologists without training in clinical physiology have become gatekeepers for future clinical physiologists. Unfortunately, this development takes place at a time when research and education in preclinical integrative physiology have diminished in favor of other organizational levels, such as cellular and molecular biology. The responsibilities for education and research in integrative human physiology have therefore mainly been transferred to clinical physiologists. Clinical physiology has been a successful independent clinical discipline in Sweden for the past 55 years and could serve as a model for other countries. Unless clinical physiologists regain control over their own discipline, systems physiology as a knowledge base and resource for patient care, education, and research will be severely impaired.
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Canadelli, Elena. "Biological stations and the study of marine life: Umberto D'Ancona and the Hydrobiological Station of Chioggia (1940–1964)." ICES Journal of Marine Science 73, no. 5 (November 17, 2015): 1447–57. http://dx.doi.org/10.1093/icesjms/fsv209.
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Abstract Marine zoological stations played an important role in the history of biology and the study of marine life. From the 1870s onward, a large number of biological stations were founded across Europe from Naples to Bergen. In the light of the new theory of evolution and the emerging discipline of ecology, it becomes increasingly necessary for biologists to study nature in the field. Beginning in the second half of the 19th century, much of the research on aquatic organisms was conducted at such stations. The aquatic environment appeared to be particularly suitable for research on the theory of evolution, on embryology, physiology, anatomy, and organism–environment interactions. Marine stations also served as sites for the study of fishery management and fish farming and aquaculture. The hydrobiological station located in the town of Chioggia on the Venetian Lagoon represents one of the less well-known examples of such research centres. It was set up in 1940 by the Italian zoologist Umberto D'Ancona of the University of Padua (1896–1964), who modelled it on already existing zoology, hydrobiology, and fish farming stations in Italy and abroad. Their research was conducted on the ecosystems of the Venetian Lagoon and the northern part of the Adriatic Sea, the natural stocks of valuable commercial fish species, and the reproductive biology of various teleosts. This essay will review the history of the Hydrobiological Station in Chioggia during the period 1940–1964 when it was directed by D'Ancona, its work in the fields of marine biology and fishery, and its ties with other marine stations in Italy and abroad.
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Oliveira, Cicero Diogo, Rosangela Lessa, Zafira Almeida, and Francisco Marcante Santana. "Biology and fishery of Acoupa Weakfish Cynoscion acoupa (Lacepède, 1801): a review." Neotropical Biology and Conservation 15, no. 3 (August 14, 2020): 333–49. http://dx.doi.org/10.3897/neotropical.15.e55563.
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The present study describes the fishery and biology of Acoupa Weakfish Cynoscion acoupa, an important fishery resource in South America. We found and analyzed 31 articles and 10 publications about the species. Cynoscion acoupa is an estuarine marine species, which has a feeding habit with preference for fish and crustaceans. Its spawning occurs during two periods of the year and the size at maturity of females is 40 to 50 cm, while males mature earlier, with 38–40 cm. Their growth is considered slow to moderate, with growth coefficient k ranging from 0.13 to 0.28, and the species can reach up to 15 years of age. C. acoupa is target of commercial and recreational fisheries in estuarine and marine coastal environments, mainly in the northern region of South America. The fisheries occur throughout the year, with different fishing gear, being more frequent with gillnets. In addition, fishing is more frequent on juveniles, which may compromise the stock. This species is categorized as of Least Concern by the International Union for Conservation of Nature, although it has a high degree of vulnerability to fishing, which, combined with overexploitation, shows that C. acoupa should be listed as under threat of extinction to some degree. The lack of studies on the species makes it difficult to establish management measures. Therefore, further studies should be prioritized, especially on reproductive biology, growth and fishing exploitation.
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Nerio, Ron, Althea Webber, Effie MacLachlan, David Lopatto, and Avrom J. Caplan. "One-Year Research Experience for Associate’s Degree Students Impacts Graduation, STEM Retention, and Transfer Patterns." CBE—Life Sciences Education 18, no. 2 (June 2019): ar25. http://dx.doi.org/10.1187/cbe.19-02-0042.
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The CUNY Research Scholars Program (CRSP) provides a yearlong faculty-mentored research experience to associate’s degree students. The program takes place at all 10 associate’s degree–granting colleges within the City University of New York system. We report on a mixed-methods study of 500 students who participated in the program during its initial 3 years. Quantitative longitudinal assessments revealed that students who engaged in CRSP were more likely to be retained in a science, technology, engineering, and mathematics (STEM) discipline or to graduate with a STEM degree than their counterparts in a matched comparison group. Furthermore, students who participated in CRSP demonstrated an increased likelihood of transferring to the more research-intensive 4-year schools within the CUNY system and to R1 universities outside the CUNY system. CRSP students reported an increased sense of belonging in college based on survey data, and focus groups with their mentors provided insight into the factors that led to the gains listed above. These combined results—of student data analysis, student surveys, and mentor focus groups—provide evidence that early research experiences for associate’s degree students contribute to their academic success.
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Guțu, Modest, and Iorgu Petrescu. "Richard W. Heard (February 14, 1939 – November 2, 2022)." Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa” 65, no. 2 (December 31, 2022): 199–204. http://dx.doi.org/10.3897/travaux.65.e99011.
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Professor Dr. Richard Willis Heard, a longtime and outstanding collaborator of the “Grigore Antipa” National Museum of Natural History of Bucharest, passed away on November 2, 2022. Richard was born on February 14, 1939 in Savannah, Georgia (USA). He was a graduate of Savannah Country Day School and attended the University of Georgia, receiving his BS and MS degree in Zoology. He received his PhD degree in Biology at the University of Southern Mississippi (1976). He worked for more than 35 years at the Gulf Coast Research Laboratory (The University of Southern Mississippi), passing through various hierarchical steps, up to that of Head of the Invertebrate Zoology Section. He was drawn to know the marine invertebrates of the Gulf of Mexico, Caribbean Sea, and western Atlantic Ocean. His research focused primarily on the study of peracarid crustaceans. Also he mentored many students and young researchers specializing in marine biology.
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Dyer, Michael G. "Toward Synthesizing Artificial Neural Networks that Exhibit Cooperative Intelligent Behavior: Some Open Issues in Artificial Life." Artificial Life 1, no. 1_2 (October 1993): 111–34. http://dx.doi.org/10.1162/artl.1993.1.1_2.111.
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The tasks that animals perform require a high degree of intelligence. Animals forage for food, migrate, navigate, court mates, rear offspring, defend against predators, construct nests, and so on. These tasks commonly require social interaction/cooperation and are accomplished by animal nervous systems, which are the result of billions of years of evolution and complex developmental/learning processes. The Artificial Life (AL) approach to synthesizing intelligent behavior is guided by this biological perspective. In this article we examine some of the numerous open problems in synthesizing intelligent animal behavior (especially cooperative behavior involving communication) that face the field of AL, a discipline still in its infancy.
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Telford, S. R. "Annotation: marine waters and nonenteric illness--matching the degree of analytical rigor to the biology of the infectious process." American Journal of Public Health 86, no. 9 (September 1996): 1203–4. http://dx.doi.org/10.2105/ajph.86.9.1203.
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Fu, Xinhua, Wei Wang, Jianhua Hao, Xianglin Zhu, and Mi Sun. "Purification and Characterization of Catalase from Marine BacteriumAcinetobactersp. YS0810." BioMed Research International 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/409626.
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The catalase from marine bacteriumAcinetobactersp. YS0810 (YS0810CAT) was purified and characterized. Consecutive steps were used to achieve the purified enzyme as follows: ethanol precipitation, DEAE Sepharose ion exchange, Superdex 200 gel filtration, and Resource Q ion exchange. The active enzyme consisted of four identical subunits of 57.256 kDa. It showed a Soret peak at 405 nm, indicating the presence of iron protoporphyrin IX. The catalase was not apparently reduced by sodium dithionite but was inhibited by 3-amino-1,2,4-triazole, hydroxylamine hydrochloride, and sodium azide. Peroxidase-like activity was not found with the substrate o-phenylenediamine. So the catalase was determined to be a monofunctional catalase. N-terminal amino acid of the catalase analysis gave the sequence SQDPKKCPVTHLTTE, which showed high degree of homology with those of known catalases from bacteria. The analysis of amino acid sequence of the purified catalase by matrix-assisted laser desorption ionization time-of-flight mass spectrometry showed that it was a new catalase, in spite of its high homology with those of known catalases from other bacteria. The catalase showed high alkali stability and thermostability.
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Nascimento, K. S., C. S. Nagano, E. V. Nunes, R. F. Rodrigues, G. V. Goersch, B. S. Cavada, J. J. Calvete, S. Saker-Sampaio, W. R. L. Farias, and A. H. Sampaio. "Isolation and characterization of a new agglutinin from the red marine alga Hypnea cervicornis J. Agardh." Biochemistry and Cell Biology 84, no. 1 (February 1, 2006): 49–54. http://dx.doi.org/10.1139/o05-152.
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The biochemical characterization of a new lectin (Hypnea cervicornis agglutinin or HCA) isolated from the Brazilian red alga H. cervicornis is reported. The haemagglutinating activity of the lectin was only inhibited by the glycoprotein porcine stomach mucin at a minimum inhibitory concentration of 19 µg·mL–1. No haemagglutination inhibition was detected after the addition of simple sugars. The MALDI-TOF molecular masses of native and reduced and carbamidomethylated HCA were, respectively, 9196.6 Da and 9988.2 Da, indicating that the primary structure of the protein is crosslinked by 7 disulfide bonds. This unusual structural feature among lectins, along with its N-terminal sequence and amino-acid composition, clearly shows that HCA belongs to a protein family distinct from the isolectins Hypnin A1 and A2 isolated from the related Japanese alga Hypnea japonica. On the other hand, HCA displayed a high degree of similarity to the agglutinin from the Brazilian species Hypnea musciformis. Our data indicate the occurrence of structural diversity among lectins of closely related species living in distant ecosystems, i.e., the Pacific coast of Japan and the Atlantic coast of Brazil, and support the hypothesis that the lectin content (lectinome) might serve as a biomarker for taxonomical purposes.Key words: agglutinin, lectin, isolation, Hypnea cervicornis, red marine alga.
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Drinkwater, Michael J., Kelly E. Matthews, and Jacob Seiler. "How Is Science Being Taught? Measuring Evidence-Based Teaching Practices across Undergraduate Science Departments." CBE—Life Sciences Education 16, no. 1 (March 2017): ar18. http://dx.doi.org/10.1187/cbe.15-12-0261.
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While there is a wealth of research evidencing the benefits of active-learning approaches, the extent to which these teaching practices are adopted in the sciences is not well known. The aim of this study is to establish an evidential baseline of teaching practices across a bachelor of science degree program at a large research-intensive Australian university. Our purpose is to contribute to knowledge on the adoption levels of evidence-based teaching practices by faculty within a science degree program and inform our science curriculum review in practical terms. We used the Teaching Practices Inventory (TPI) to measure the use of evidence-based teaching approaches in 129 courses (units of study) across 13 departments. We compared the results with those from a Canadian institution to identify areas in need of improvement at our institution. We applied a regression analysis to the data and found that the adoption of evidence-based teaching practices differs by discipline and is higher in first-year classes at our institution. The study demonstrates that the TPI can be used in different institutional contexts and provides data that can inform practice and policy.
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Pluvinage, Benjamin, Craig S. Robb, Roderick Jeffries, and Alisdair B. Boraston. "The structure of PfGH50B, an agarase from the marine bacterium Pseudoalteromonas fuliginea PS47." Acta Crystallographica Section F Structural Biology Communications 76, no. 9 (August 19, 2020): 422–27. http://dx.doi.org/10.1107/s2053230x20010328.
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The recently identified marine bacterium Pseudoalteromonas fuliginea sp. PS47 possesses a polysaccharide-utilization locus dedicated to agarose degradation. In particular, it contains a gene (locus tag EU509_06755) encoding a β-agarase that belongs to glycoside hydrolase family 50 (GH50), PfGH50B. The 2.0 Å resolution X-ray crystal structure of PfGH50B reveals a rare complex multidomain fold that was found in two of the three previously determined GH50 structures. The structure comprises an N-terminal domain with a carbohydrate-binding module (CBM)-like fold fused to a C-terminal domain by a rigid linker. The CBM-like domain appears to function by extending the catalytic groove of the enzyme. Furthermore, the PfGH50B structure highlights key structural features in the mobile loops that may function to restrict the degree of polymerization of the neoagaro-oligosaccharide products and the enzyme processivity.
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Lindegren, Martin, David M. Checkley, Mark D. Ohman, J. Anthony Koslow, and Ralf Goericke. "Resilience and stability of a pelagic marine ecosystem." Proceedings of the Royal Society B: Biological Sciences 283, no. 1822 (January 13, 2016): 20151931. http://dx.doi.org/10.1098/rspb.2015.1931.
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The accelerating loss of biodiversity and ecosystem services worldwide has accentuated a long-standing debate on the role of diversity in stabilizing ecological communities and has given rise to a field of research on biodiversity and ecosystem functioning (BEF). Although broad consensus has been reached regarding the positive BEF relationship, a number of important challenges remain unanswered. These primarily concern the underlying mechanisms by which diversity increases resilience and community stability, particularly the relative importance of statistical averaging and functional complementarity. Our understanding of these mechanisms relies heavily on theoretical and experimental studies, yet the degree to which theory adequately explains the dynamics and stability of natural ecosystems is largely unknown, especially in marine ecosystems. Using modelling and a unique 60-year dataset covering multiple trophic levels, we show that the pronounced multi-decadal variability of the Southern California Current System (SCCS) does not represent fundamental changes in ecosystem functioning, but a linear response to key environmental drivers channelled through bottom-up and physical control. Furthermore, we show strong temporal asynchrony between key species or functional groups within multiple trophic levels caused by opposite responses to these drivers. We argue that functional complementarity is the primary mechanism reducing community variability and promoting resilience and stability in the SCCS.
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Young, Robert G., Cathryn L. Abbott, Thomas W. Therriault, and Sarah J. Adamowicz. "Barcode-based species delimitation in the marine realm: a test using Hexanauplia (Multicrustacea: Thecostraca and Copepoda)." Genome 60, no. 2 (February 2017): 169–82. http://dx.doi.org/10.1139/gen-2015-0209.
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DNA barcoding has been used successfully for identifying specimens belonging to marine planktonic groups. However, the ability to delineate species within taxonomically diverse and widely distributed marine groups, such as the Copepoda and Thecostraca, remains largely untested. We investigate whether a cytochrome c oxidase subunit I (COI-5P) global pairwise sequence divergence threshold exists between intraspecific and interspecific divergences in the copepods plus the thecostracans (barnacles and allies). Using publicly accessible sequence data, we applied a graphical method to determine an optimal threshold value. With these thresholds, and using a newly generated planktonic marine data set, we quantify the degree of concordance using a bidirectional analysis and discuss different analytical methods for sequence-based species delimitation (e.g., BIN, ABGD, jMOTU, UPARSE, Mothur, PTP, and GMYC). Our results support a COI-5P threshold between 2.1% and 2.6% p-distance across methods for these crustacean taxa, yielding molecular groupings largely concordant with traditional, morphologically defined species. The adoption of internal methods for clustering verification enables rapid biodiversity studies and the exploration of unknown faunas using DNA barcoding. The approaches taken here for concordance assessment also provide a more quantitative comparison of clustering results (as contrasted with “success/failure” of barcoding), and we recommend their further consideration for barcoding studies.
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Rose, Steven. "Précis of Lifelines: Biology, freedom, determinism." Behavioral and Brain Sciences 22, no. 5 (October 1999): 871–85. http://dx.doi.org/10.1017/s0140525x99002204.
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There are many ways of describing and explaining the properties of living systems; causal, functional, and reductive accounts are necessary but no one account has primacy. The history of biology as a discipline has given excessive authority to reductionism, which collapses higher level accounts, such as social or behavioural ones, into molecular ones. Such reductionism becomes crudely ideological when applied to the human condition, with its claims for genes “for” everything from sexual orientation to compulsive shopping. The current enthusiasm for genetics and ultra-Darwinist accounts, with their selfish-gene metaphors for living processes, misunderstand both the phenomena of development and the interactive role that DNA and the fluid genome play in the cellular orchestra. DNA is not a blueprint, and the four dimensions of life (three of space, one of time) cannot be read off from its one-dimensional strand. Both developmental and evolutionary processes are more than merely instructive or selective; the organism constructs itself, a process known as autopoiesis, through a lifeline trajectory. Because organisms are thermodynamically open systems, living processes are homeodynamic, not homeostatic. The self-organising membrane-bound and energy-utilising metabolic web of the cell must have evolved prior to so-called naked replicators. Evolution is constrained by physics, chemistry, and structure; not all change is powered by natural selection, and not all phenotypes are adaptive. Finally, therefore, living processes are radically indeterminate; like all other living organisms, but to an even greater degree, we make our own future, though in circumstances not of our own choosing.
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Cronin, Thomas W., and Nadav Shashar. "The linearly polarized light field in clear, tropical marine waters: spatial and temporal variation of light intensity, degree of polarization and e-vector angle." Journal of Experimental Biology 204, no. 14 (July 15, 2001): 2461–67. http://dx.doi.org/10.1242/jeb.204.14.2461.
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SUMMARYSensitivity to polarized light is widespread among marine animals, including crustaceans, cephalopods and some fishes. They use this ability to orient and find prey, and possibly for a number of other visual tasks. Unlike the ultraviolet-sensitive polarization receptors of most insects, the polarization receptors of marine invertebrates tend to be maximally sensitive near 500nm, suggesting that polarized light in water differs from that in air. The underwater field of partially linearly polarized light has been studied for nearly 50 years, but data are still limited and sparse. We measured the submarine polarized light field from 350 to 600nm throughout the day on a coral reef in the Florida Keys at a depth of 15m using the underwater laboratory Aquarius as a research platform. Our results show that the angle of polarization as viewed along any given line of sight at this depth is a relatively simple function of solar position and that the degree of polarization is greatest 60–90° from the sun. Both e-vector angle and degree of polarization vary only slightly with wavelength, although light is sometimes less polarized in the ultraviolet. Since light is most intense at medium wavelengths and polarization is nearly maximal at these wavelengths, invertebrate polarization photoreceptors are spectrally well placed. Also, the relative spectral constancy of the angle and degree of polarization supports fish polarization sensitivity, which relies on spectrally diverse photoreceptor sets.
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Williams, Terrie M. "The evolution of cost efficient swimming in marine mammals: limits to energetic optimization." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 354, no. 1380 (January 29, 1999): 193–201. http://dx.doi.org/10.1098/rstb.1999.0371.
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Mammals re–entered the oceans less than 60 million years ago. The transition from a terrestrial to an aquatic lifestyle required extreme morphological and behavioural modifications concomitant with fundamentally different locomotor mechanisms for moving on land and through water. Energetic transport costs typically reflect such different locomotor modes, but can not be discerned from the fossil record. In this study the energetic challenges associated with changing from terrestrial to aquatic locomotion in primitive marine mammals are examined by comparing the transport, maintenance and locomotor costs of extant mammals varying in degree of aquatic specialization. The results indicate that running and swimming specialists have converged on an energetic optimum for locomotion. An allometric expression, COT TOT = 7.79 mass −0.29 ( r 2 = 0.83, n = 6 species), describes the total cost of transport in J kg −1 m −1 for swimming marine mammals ranging in size from 21 kg to 15,000 kg. This relation is indistinguishable from that describing total transport costs in running mammals. In contrast, the transitional lifestyle of semi–aquatic mammals, similar to that of ancestral marine mammals, incurs costs that are 2.4–5.1 times higher than locomotor specialists. These patterns suggest that primitive marine mammals confronted an energetic hurdle before returning to costs reminiscent of their terrestrial ancestry, and may have reached an evolutionary limit for energetic optimization during swimming.
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Schunter, C., M. Pascual, J. C. Garza, N. Raventos, and E. Macpherson. "Kinship analyses identify fish dispersal events on a temperate coastline." Proceedings of the Royal Society B: Biological Sciences 281, no. 1785 (June 22, 2014): 20140556. http://dx.doi.org/10.1098/rspb.2014.0556.
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Connectivity is crucial for the persistence and resilience of marine species, the establishment of networks of marine protected areas and the delineation of fishery management units. In the marine environment, understanding connectivity is still a major challenge, due to the technical difficulties of tracking larvae. Recently, parentage analysis has provided a means to address this question effectively. To be effective, this method requires limited adult movement and extensive sampling of parents, which is often not possible for marine species. An alternative approach that is less sensitive to constraints in parental movement and sampling could be the reconstruction of sibships. Here, we directly measure connectivity and larval dispersal in a temperate marine ecosystem through both analytical approaches. We use data from 178 single nucleotide polymorphism markers to perform parentage and sibship reconstruction of the black-faced blenny ( Tripterygion delaisi ) from an open coastline in the Mediterranean Sea. Parentage analysis revealed a decrease in dispersal success in the focal area over 1 km distance and approximately 6.5% of the juveniles were identified as self-recruits. Sibship reconstruction analysis found that, in general, full siblings did not recruit together to the same location, and that the largest distance between recruitment locations was much higher (11.5 km) than found for parent–offspring pairs (1.2 km). Direct measurements of dispersal are essential to understanding connectivity patterns in different marine habitats, and show the degree of self-replenishment and sustainability of populations of marine organisms. We demonstrate that sibship reconstruction allows direct measurements of dispersal and family structure in marine species while being more easily applied in those species for which the collection of the parental population is difficult or unfeasible.
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Wood, Christopher D., Takuya Nishigaki, Toshiaki Furuta, Shoji A. Baba, and Alberto Darszon. "Real-time analysis of the role of Ca2+ in flagellar movement and motility in single sea urchin sperm." Journal of Cell Biology 169, no. 5 (May 31, 2005): 725–31. http://dx.doi.org/10.1083/jcb.200411001.
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Eggs of many marine and mammalian species attract sperm by releasing chemoattractants that modify the bending properties of flagella to redirect sperm paths toward the egg. This process, called chemotaxis, is dependent on extracellular Ca2+. We used stroboscopic fluorescence imaging to measure intracellular Ca2+ concentration ([Ca2+]i) in the flagella of swimming sea urchin sperm. Uncaging of cyclic GMP induced Ca2+ entry via at least two distinct pathways, and we identified a nimodipine-sensitive pathway, compartmentalized in the flagella, as a key regulator of flagellar bending and directed motility changes. We found that, contrary to current models, the degree of flagellar bending does not vary in proportion to the overall [Ca2+]i. Instead we propose a new model whereby flagella bending is increased by Ca2+ flux through the nimodipine-sensitive pathway, and is unaffected by [Ca2+]i increases through alternative pathways.
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Lindell, Debbie, Etana Padan, and Anton F. Post. "Regulation of ntcA Expression and Nitrite Uptake in the Marine Synechococcus sp. Strain WH 7803." Journal of Bacteriology 180, no. 7 (April 1, 1998): 1878–86. http://dx.doi.org/10.1128/jb.180.7.1878-1886.1998.
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ABSTRACT NtcA is a transcriptional activator involved in global nitrogen control in cyanobacteria. In the absence of ammonium it regulates the transcription of a series of genes encoding proteins required for the uptake and assimilation of alternative nitrogen sources (I. Luque, E. Flores, and A. Herrero, EMBO J. 13:2862–2869, 1994). ntcA, present in a single copy in the marine Synechococcus sp. strain WH 7803, was cloned and sequenced. The putative amino acid sequence shows a high degree of identity to NtcA from freshwater cyanobacteria in two functional domains. The expression ofntcA was negatively regulated by ammonium from a putative transcription start point located downstream of an NtcA consensus recognition sequence. Addition of either rifampin or ammonium led to a rapid decline in ntcA transcript levels with half-lives of less than 2 min in both cases. Nitrate-grown cells showed highntcA transcript levels, as well as the capacity for active nitrite uptake. However, ammonium-grown cells showed low levels of thentcA transcript and did not utilize nitrite. The addition of ammonium to nitrite uptake-active cells resulted in a gradual decline in the rate of uptake over a 24-h period. Active nitrite uptake was not induced in cells transferred to medium lacking a nitrogen source despite evidence of elevated expression of ntcA, indicating that ntcA expression is not sufficient for uptake capacity to develop. Nitrate and nitrite addition led to the development of nitrite uptake, whereas the addition of leucine did not. Furthermore, nitrite addition triggered the de novo protein synthesis required for uptake capacity to develop. These data suggest that nitrite and nitrate act as specific inducers for the synthesis of proteins required for nitrite uptake.
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Pfeifer, K., W. Frank, H. C. Schroder, V. Gamulin, B. Rinkevich, R. Batel, I. M. Muller, and W. E. Muller. "Cloning of the polyubiquitin cDNA from the marine sponge Geodia cydonium and its preferential expression during reaggregation of cells." Journal of Cell Science 106, no. 2 (October 1, 1993): 545–53. http://dx.doi.org/10.1242/jcs.106.2.545.
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Ubiquitination of proteins is a critical step in the controlled degradation process of many polypeptides. Here we show that sponges, the simplest multicellular group of eukaryotic organisms, are also equipped with the ubiquitin pathway. The polyubiquitin cDNA was isolated and characterized from the marine sponge Geodia cydonium. The open reading frame contains six ubiquitin moieties, which are lined up head to tail without spacers. A comparison of the predicted amino acid sequence of the six sponge ubiquitin-coding units with those from other organisms revealed a high degree of homology (> 93%). The ubiquitin gene is expressed to almost the same extent in the two main compartments of the sponge, the cortex and the medulla. However, only in the cortex are detectable amounts of the ubiquitin protein synthesized. The ubiquitin protein isolated from the sponge organism was found to initiate protein degradation in the heterologous reticulocyte system in the same manner as bovine ubiquitin. In vitro studies with dissociated sponge cells revealed that the homologous aggregation factor causes (i) a strong increase in the steady-state level of mRNA coding for ubiquitin and (ii) a drastic increase in ubiquitin protein synthesis, while the homologous lectin failed to display that effect in isolated cells. These data suggest that ubiquitin may play a role in sponge morphogenesis.
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Price, Andrew R. G. "The Marine Food Chain in Relation to Biodiversity." Scientific World JOURNAL 1 (2001): 579–87. http://dx.doi.org/10.1100/tsw.2001.85.
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Biodiversity provides “raw materials” for the food chain and seafood production, and also influences the capacity of ecosystems to perform these and other services. Harvested marine seafood species now exceed 100 million t y -1 and provide about 6% of all protein and 17% of animal protein consumed by humans. These resources include representatives from about nine biologically diverse groups of plants and animals. Fish account for most of the world’s marine catches, of which only 40 species are taken in abundance. Highest primary productivity and the richest fisheries are found within Exclusive Economic Zones (EEZ). This narrow strip (200 nautical mile/370 km wide) is not only the site of coastal “food factories” but also the area associated with heaviest perturbation to the marine environment. Structural redundancy is evident in marine ecosystems, in that many species are interchangeable in the way they characterise assemblage composition. While there is probably functional redundancy within groups, the effects of species loss on ecosystem performance cannot be easily predicted. In particular, the degree to which biodiversity per se is needed for ecosystem services, including seafood/fishery production, is poorly understood. Many human activities, including unsustainable fishing and mariculture, lead to erosion of marine biodiversity. This can undermine the biophysical cornerstones of fisheries and have other undesirable environmental side effects. Of direct concern are “species effects”, in particular the removal of target and non-target fishery species, as well as conservationally important fauna. Equally disrupting but less immediate are “ecosystem effects”, such as fishing down the food web, following a shift from harvested species of high to low trophic level. Physical and biological disturbances from trawl nets and dynamite fishing on coral reefs can also severely impact ecosystem structure and function. “Broadscale” biological and social effects brought about by fishing carry even more far-reaching consequences. For example, fishing itself can change the age at which sexual maturity is reached, thus affecting the reproductive status of the stock. Hence, fishing may be regarded as a mediator of evolution. Social impacts include conflicts over fish prices and policies arising from heavy fishing and inadequate institutional structures. Measures to increase the sustainability of catches and of biodiversity need to be much more tightly coupled. Promising approaches include use of bio-economic indicators and fully protected marine areas. High- and local-level governance options are also examined. Use of expert systems incorporating “fuzzy logic” are providing useful environmental insights in the ASEAN countries and other parts of the world, and have applications in fishery management and biodiversity conservation.
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Lebaron, P., M. Troussellier, P. Got, and B. Baleux. "Distribution spatio-temporelle d'une population bactérienne allochtone (coliformes thermotolérants) dans un écosystème marin côtier (Bassin de Thau, France)." Canadian Journal of Microbiology 36, no. 5 (May 1, 1990): 307–17. http://dx.doi.org/10.1139/m90-055.
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The variation in the levels of thermotolerant coliforms has been measured at various time–space observation scales in a marine coastal ecosystem (Thau pond). The spatial distribution of the bacteria was organized in the ecosystem (observation distance ≈1 km) in the form of either spots or gradients. The latter only appeared after massive drifts from the watershed. A strong local variation (< 1 km) was permanently associated with a broader observation scale. Local variation can develop from rapidly decreasing gradients in the levels of thermotolerant coliforms, starting from the drift points of the watershed. The variation with time was high whatever the observation frequency (monthly, daily, hourly). Monthly sampling usually revealed higher bacterial counts during winter compared with summer. During winter, the daily and hourly degree of variation of the bacterial levels was comparable and the populations were organized according to a linear trend. In summer time, there was a higher degree of variation in the populations and hourly variations can show cyclic trends (diurnal minima and nocturnal maxima). Our results show that privileged sampling scales occur and should be considered when evaluating the impact of environmental parameters (sun exposure, role of the watershed… ) and trying to correlate them. These results also enabled us to define a better sampling strategy for the detection of thermotolerant coliforms in such an ecosystem. Key words: thermotolerant coliforms, marine coastal ecosystem, spatial distribution, variation with time, sampling. [Journal translation]
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Hou, Zhenxin, Cynthia K. Faulk, and Lee A. Fuiman. "Dynamics of diet-egg transfer of fatty acids in the teleost fish, red drum ( Sciaenops ocellatus )." Philosophical Transactions of the Royal Society B: Biological Sciences 375, no. 1804 (June 15, 2020): 20190646. http://dx.doi.org/10.1098/rstb.2019.0646.
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Eggs of marine organisms are increasingly being recognized as important components of marine food webs. The degree to which egg fatty acid profiles reflect maternal diet fatty acid profiles, and therefore the value of fatty acids in eggs as trophic biomarkers, depends on the species' reproductive strategy and the extent of modification of ingested fatty acids. We measured the dynamics of transfer of recently ingested fatty acids to spawned eggs in a batch-spawning teleost, red drum ( Sciaenops ocellatus ). Results of 21 diet-shift experiments, from which the fatty acid profiles of the diets and eggs were compared, showed that 15 of 27 fatty acids measured (one saturated, two monounsaturated and 12 polyunsaturated fatty acids) in eggs were correlated with their levels in the recent diet, and the rate of incorporation into eggs was proportional to the magnitude of the diet shift. Large shifts in diet might occur naturally during spawning migrations or when prey communities vary over time. Results of this study indicate that fatty acids in red drum eggs can be useful for studying adult diet and exploring trophic linkages in marine systems. This article is part of the theme issue ‘The next horizons for lipids as ‘trophic biomarkers': evidence and significance of consumer modification of dietary fatty acids'.
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Żeber-Dzikowska, Ilona. "Czym jest edukacja biologiczna w wychowaniu człowieka?" Studia Ecologiae et Bioethicae 7, no. 2 (December 31, 2009): 105–18. http://dx.doi.org/10.21697/seb.2009.7.2.09.
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Schools allow to develop and extend the approaches and attitudes in the social, moral, ideological, and religious spheres. The realization of these matters is possible due to the fulfillment of three basic school functions, i.e. didactic, educational, and protective. No one should forget that human education starts already in the period of childhood. Initially, parents introduce the children to the indispensable problems and matters in their future lives. It takes place in the form of games. They satisfy their growing need of gaining the knowledge, by answering numerous questions. They develop the knowledge through practical activities to let them gain experience, that is, organize walks, educational games, and so forth. Then young people begin school education, which influences, to a large degree, their lives. Then, in the educational process, the subject of Biology appears, almost certainly already known thanks to the parents’ education. The scientific discipline called Biology is a very important element in the education of people, which is helpful in understanding their own personalities and the surrounding reality. The wide range of biological contents as well as the short reflection on the subject of gaining the knowledge in the range of Biology allows us to notice, that this discipline, similarly to other disciplines shapes the personality of young, growing up people. All things considered, however, it differs from disciplines such as history, or mathematics, because it is closely and directly related to the human being and functioning, as the basis of human life. Biology, more considerably and effectively, than different disciplines, makes the students sensible towards human needs as well as the needs of nature and its protection.
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PRIATNI, SRI, DIAH RATNANINGRUM, WAWAN KOSASIH, EEN SRIENDAH, YOICE SRIKANDACE, TINA ROSMALINA, and SRI PUDJIRAHARTI. "Protein and fatty acid profile of marine fishes from Java Sea, Indonesia." Biodiversitas Journal of Biological Diversity 19, no. 5 (September 21, 2018): 1737–42. http://dx.doi.org/10.13057/biodiv/d190520.
Full textAbstract:
Priatni S, Ratnaningrum D, Kosasih W, Sriendah E, Srikandace Y, Rosmalina T, Pudjiraharti S. 2018. Protein and fatty acidprofile of marine fishes from Java Sea, Indonesia. Biodiversitas 19: 1737-1742. Indonesia is the second largest producer of capturefisheries products in the world and the most capture fisheries production comes from marine fisheries. Marine fish is a source of protein,amino acid, saturated and unsaturated fatty acids, which are important components of diet. The objective of the study was to investigatethe protein and fatty acids profile of nine marine fish samples from Java Sea of Indramayu West Java, Indonesia. The analysis datashowed that the total protein content of fish samples ranged from 61.07% (Pampus argenteus) to 86.56% (Tetraodontidae). Meanwhile,total lipid content of fish samples ranged from 1.73% (Tetraodontidae) to 9.82% (Leiognathus equulus). The concentration of α-AminoNitrogen (AN) of fish protein hydrolysate was ranging from 31 mM (Nemipterus hexodon) to 69 mM (Mystacoleucus padangensis)and% Degree of Hydrolysis (DH) was ranging from 9.33% to 20.39%. The molecular weight of protein fish samples had similar profilesprimarily for almost all samples, which could be observed from a typical band with the weight around 49 kDa. The saturated fatty acid(Ʃ SFA) compositions of fish species ranged from 1094.03-4233.03 μg/g. Oleic acid (MUFA) content of all fish species ranged from257.91-1216.06 μg/g. However, only three fish species contain of Poly Unsaturated Fatty Acid (PUFA) linoleic acid as the following;Selaroides leptolepis (171.36 μg/g), Oxyeleotris marmorata (249.40μg/g) and Tetraodontidae (140.35 μg/g). The highest SFA contentwas found in S. leptolepis with palmitic acid (C16:0) as the dominant saturated fatty acid (2320.88 μg/g). S. leptolepis also containedhigh oleic acid (1216.06 μg/g) and linoleic acid (171.36 μg/g).
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Volkov, A. F. "OPPORTUNITIES AND TECHNIQUES OF USING THE DATABASES OF TINRO «ZOOPLANKTON OF THE NORTH PACIFIC, OKHOTSK, BERING, AND CHUKCHI SEAS», «NEKTON TROPHOLOGY», AND «MARINE BIOLOGY»." Izvestiya TINRO 198 (October 2, 2019): 239–61. http://dx.doi.org/10.26428/1606-9919-2019-198-239-261.
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Structure of the databases «Zooplankton…» and «Nekton trophology» is described and some techniques are proposed for nekton studies using these bases in conjunction with the database «Marine Biology». All three databases are regularly updated. The bases «Zooplankton…» and «Nekton trophology» contain raw data on plankton and feeding of nekton collected in the North Pacific and the Okhotsk, Bering and Chukchi Seas in 1984–2018. The «Nekton trofology» database contains information for 97 species of nekton, mostly for mass species (72–78 % of samples belong to 5 most numerous species), and 156 species of prey, including 27 species of Copepoda, 7 species of Euphausiacea, 9 species of Amphipoda, 14 species of Decapoda, 6 species of Coelenterata, 15 species of Cephalopoda, and 60 species of Pisces, other groups of prey are represented by 1–2 species. The data are spatially sorted by biostatistical areas and their sub-areas, in total 64 sub-areas in the Okhotsk Sea, 32 areas in the Bering Sea, 30 areas in the North Pacific, and 5 areas in the Chukchi Sea. Mean depth is determined for each sub-area. Method of spatial distribution mapping is demonstrated with using the sub-areas as integral stations or the 1-degree grid for Surfer software. Technique of regional inventory is explained with summarizing and averaging the data and calculation of various indicators as plankton–nekton ratio, etc. The 1-degree trapeziums are numbered for easier usage. Some useful examples are presented with the author’s comments (showing his personal opinion).
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Rogers, Clare, Melanie Gubbels Bupp, Unyoung Kim, Gregory DeKrey, Sharon Stranford, Rheem Medh, and Gloria Tomich. "Successful integration of practical flow cytometric experience into undergraduate education. (51.4)." Journal of Immunology 186, no. 1_Supplement (April 1, 2011): 51.4. http://dx.doi.org/10.4049/jimmunol.186.supp.51.4.
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Abstract Flow cytometry is an essential tool in almost every discipline of cell biology, and is increasingly utilized in a variety of other associated yet diverse fields, including molecular biology, bioengineering, microbiology and marine biology. For many years, access to the use of flow cytometers as teaching tools, even in large universities, was limited to graduate programs, due to the cost of instrument purchase and maintenance, and to the complexity of operation. Recently, several affordable, bench-top flow cytometers have appeared on the market. The affordability and user-friendly nature of these instruments have made them attractive to the faculty of various departments at medium- and small-sized universities and colleges for use both as teaching tools and in faculty research projects. We have compiled information here on the funding sources for both purchase and maintenance of these instruments at our various institutions, and share information on applications, protocols and lab exercises that have worked well with our students. Example protocols described include applications such as immunophenotyping, apoptosis (annexin/propidium iodide), monocytic phagocytosis, intracellular and mitochondrial reactive oxygen species detection, and detection of fluorescent protein expression in bacteria.
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Zhang, Liying, Zhuting Li, Lei Zhang, Zhixiao Lei, Liming Jin, Jijuan Cao, and Chunshan Quan. "High-Efficiency Reducing Strain for Producing Selenium Nanoparticles Isolated from Marine Sediment." International Journal of Molecular Sciences 23, no. 19 (October 8, 2022): 11953. http://dx.doi.org/10.3390/ijms231911953.
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Selenium nanoparticles (SeNPs) are all important for research because they exhibit a higher degree of absorption and lower toxicity than that of their organic and inorganic forms. At present, there are few reports on marine strains that can reduce Se(IV) to generate Se(0). In this study, a strain that reduces sodium selenite to SeNPs with high efficiency was screened from 40 marine strains. The SeNPs-S produced by the whole cells and SeNPs-E produced by the extracellular extract were characterized by FTIR, UV, Raman, XRD and SEM. Based on the results, the two kinds of SeNPs exhibited obvious differences in morphology, and their surfaces were capped with different biomacromolecules. Due to the difference in shape and surface coating, opposite results were obtained for the antibacterial activity of SeNPs-S and SeNPs-E against Gram-positive and Gram-negative bacteria. Both SeNPs-S and SeNPs-E exhibited no obvious cytotoxicity at concentrations up to 100 μg/mL, but SeNPs-E retained lower cytotoxicity when its concentration increased to 200 μg/mL. This is the first report on the detailed difference between the SeNPs produced by whole cells and cell extracts.
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Evans, Matthew R., Mike Bithell, Stephen J. Cornell, Sasha R. X. Dall, Sandra Díaz, Stephen Emmott, Bruno Ernande, et al. "Predictive systems ecology." Proceedings of the Royal Society B: Biological Sciences 280, no. 1771 (November 22, 2013): 20131452. http://dx.doi.org/10.1098/rspb.2013.1452.
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Human societies, and their well-being, depend to a significant extent on the state of the ecosystems that surround them. These ecosystems are changing rapidly usually in response to anthropogenic changes in the environment. To determine the likely impact of environmental change on ecosystems and the best ways to manage them, it would be desirable to be able to predict their future states. We present a proposal to develop the paradigm of predictive systems ecology, explicitly to understand and predict the properties and behaviour of ecological systems. We discuss the necessary and desirable features of predictive systems ecology models. There are places where predictive systems ecology is already being practised and we summarize a range of terrestrial and marine examples. Significant challenges remain but we suggest that ecology would benefit both as a scientific discipline and increase its impact in society if it were to embrace the need to become more predictive.
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Lopez, Pierre, Denis Saulnier, Shital Swarup-Gaucher, Rarahu David, Christophe Lau, Revahere Taputuarai, Corinne Belliard, et al. "First Isolation of Virulent Tenacibaculum maritimum Isolates from Diseased Orbicular Batfish (Platax orbicularis) Farmed in Tahiti Island." Pathogens 11, no. 2 (January 21, 2022): 131. http://dx.doi.org/10.3390/pathogens11020131.
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The orbicular batfish (Platax orbicularis), also called ‘Paraha peue’ in Tahitian, is the most important marine fish species reared in French Polynesia. Sudden and widespread outbreaks of severe ‘white-patch disease’ have occurred since 2011 in batfish farms one to three weeks after the transfer of juveniles from bio-secured hatcheries to lagoon cages. With cumulative mortality ranging from 20 to 90%, the sustainability of aquaculture of this species is severely threatened. In this study, we report for the first time the isolation from diseased batfish of several isolates belonging to the species Tenacibaculum maritimum, a major pathogen of many marine fish species. Histopathological analysis, an experimental bath challenge and a field monitoring study showed that T. maritimum is associated with ‘white-patch disease’. Moreover, molecular and serological analyses performed on representative isolates revealed some degree of genetic diversity among the isolates, a finding of primary importance for epidemiological studies and the development of management and control strategies such as vaccination.
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Soderstrom, Mark. "Family Trees and Timber Rights: Albert E. Jenks, Americanization, and the Rise of Anthropology at the University of Minnesota." Journal of the Gilded Age and Progressive Era 3, no. 2 (April 2004): 176–204. http://dx.doi.org/10.1017/s1537781400003339.
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Hindsight allows present-day scholars to view the development of academic disciplines in a light that contemporaries would never have seen. Hence, from our perspective, Mary Furner's assertion that anthropology developed as a profession reacting against biology and the physical sciences makes sense, for we tend to celebrate the triumph of cultural anthropology as the coming of age of the discipline. However, this trajectory of professional development was not a necessary or predestined development. Rather, the eventual (if occasionally still embattled) predominance of culture over the categories of race, nation, and biology was only one of many possible outcomes. This paper investigates a different trajectory, one that most current scholars would hope has been relegated to the dustbin of history. It is still a cautionary tale, though, in that while the racial anthropology followed in this narrative did not survive World War II, its practitioners did enjoy a degree of prominence and influence that was much greater and longer than has been generally acknowledged by current accounts.
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Li, Jia, Zhu Xianglei, and Xu Guoliang. "Research status and development trend of altruism in the biological field - knowledge graph analysis based on CiteSpace." Journal of Biology and Medicine 6, no. 1 (December 1, 2022): 042–47. http://dx.doi.org/10.17352/jbm.000034.
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Based on the visualization analysis of foreign literature on altruistic behavior in recent ten years (2012-2022) by CiteSpace, it is found that the research on altruistic behavior in the field of biology abroad has experienced the initial exploratory stage, the outbreak stage, and now enters the stable and deepening stage. The discipline distribution is mainly behavioral ecology, supplemented by evolutionary biology, biomathematics, and genetics. The author has three main cooperative groups, and a relatively tight cooperative network has been formed locally in related fields. From the perspective of cooperation degree, the cooperation density of major research institutions is high, and relevant research has been relatively mature. Judging from the period calculated in the software, altruism, cooperation, kin Selection, reciprocity, and inclusive fitness emerged earlier. In recent years, constitutive theory, density dependence, and Habitat construction have emerged, which may become a new direction for future research. Therefore, future research can expand the scope of disciplines, strengthen the cooperation between authors and units, and explore other research hotspots.
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Abdel-Wahab, Basel A., Hanaa F. Abd El-Kareem, Ahmad Alzamami, Cinderella A. Fahmy, Basem H. Elesawy, Maged Mostafa Mahmoud, Ahmed Ghareeb, et al. "Novel Exopolysaccharide from Marine Bacillus subtilis with Broad Potential Biological Activities: Insights into Antioxidant, Anti-Inflammatory, Cytotoxicity, and Anti-Alzheimer Activity." Metabolites 12, no. 8 (July 31, 2022): 715. http://dx.doi.org/10.3390/metabo12080715.
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In the presented study, Bacillus subtilis strain AG4 isolated from marine was identified based on morphological, physiological, phylogenetic characteristics and an examination of 16S rRNA sequences. Novel exopolysaccharide (EPSR4) was extracted and isolated from the Bacillus subtilis strain as a major fraction of exopolysaccharide (EPS). The analysis of structural characterization indicated that EPSR4 is a β-glycosidic sulphated heteropolysaccharide (48.2%) with a molecular weight (Mw) of 1.48 × 104 g/mole and has no uronic acid. Analysis of monosaccharide content revealed that EPSR4 consists of glucose, rhamnose and arabinose monosaccharide in a molar ratio of 5:1:3, respectively. Morphological analysis revealed that EPSR4 possess a high crystallinity degree with a significant degree of porosity, and its aggregation and conformation in the lipid phase might have a significant impact on the bioactivity of EPSR4. The biological activity of EPSR4 was screened and evaluated by investigating its antioxidant, cytotoxicity, anti-inflammatory, and anti-Alzheimer activities. The antioxidant activity results showed that EPSR4 has 97.6% scavenging activity toward DPPH free radicals at 1500 µg/mL, with an IC50 value of 300 µg/mL, and 64.8% at 1500 µg/mL toward hydrogen peroxide free radicals (IC50 = 1500 µg/mL, 30 min). Furthermore, EPSR4 exhibited considerable inhibitory activity towards the proliferation of T-24 (bladder carcinoma), A-549 (lung cancer) and HepG-2 (hepatocellular carcinoma) cancer cell lines with IC50 of 244 µg/mL, 148 µg/mL and 123 µg/mL, respectively. An evaluation of anti-inflammatory activity revealed that EPSR4 has potent lipoxygenase (LOX) inhibitory activity (IC50 of 54.3 µg/mL) and a considerable effect on membrane stabilization (IC50 = 112.2 ± 1.2 µg/mL), while it showed cyclooxygenase (COX2) inhibitory activity up to 125 µg/mL. Finally, EPSR4 showed considerable inhibitory activity towards acetylcholine esterase activity. Taken together, this study reveals that Bacillus subtilis strain AG4 could be considered as a potential natural source of novel EPS with potent biological activities that would be useful for the healthcare system.
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Kiessling, Wolfgang, Nussaïbah B. Raja, Vanessa Julie Roden, Samuel T. Turvey, and Erin E. Saupe. "Addressing priority questions of conservation science with palaeontological data." Philosophical Transactions of the Royal Society B: Biological Sciences 374, no. 1788 (November 4, 2019): 20190222. http://dx.doi.org/10.1098/rstb.2019.0222.
Full textAbstract:
Palaeontologists often ask identical questions to those asked by ecologists. Despite this, ecology is considered a core discipline of conservation biology, while palaeontologists are rarely consulted in the protection of species, habitats and ecosystems. The recent emergence of conservation palaeobiology presents a big step towards better integration of palaeontology in conservation science, although its focus on historical baselines may not fully capture the potential contributions of geohistorical data to conservation science. In this essay we address previously defined priority questions in conservation and consider which of these questions may be answerable using palaeontological data. Using a statistical assessment of surveys, we find that conservation biologists and younger scientists have a more optimistic view of potential palaeontological contributions to the field compared to experienced palaeontologists. Participants considered questions related to climate change and marine ecosystems to be the best addressable with palaeontological data. As these categories are also deemed most relevant by ecologists and receive the greatest research effort in conservation, they are the natural choice for future academic collaboration. This article is part of a discussion meeting issue ‘The past is a foreign country: how much can the fossil record actually inform conservation?’
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Kocsis, Ádám T., Carl J. Reddin, Christopher R. Scotese, Paul J. Valdes, and Wolfgang Kiessling. "Increase in marine provinciality over the last 250 million years governed more by climate change than plate tectonics." Proceedings of the Royal Society B: Biological Sciences 288, no. 1957 (August 18, 2021): 20211342. http://dx.doi.org/10.1098/rspb.2021.1342.
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Amidst long-term fluctuations of the abiotic environment, the degree to which life organizes into distinct biogeographic provinces (provinciality) can reveal the fundamental drivers of global biodiversity. Our understanding of present-day biogeography implies that changes in the distribution of continents across climatic zones have predictable effects on habitat distribution, dispersal barriers and the evolution of provinciality. To assess marine provinciality through the Phanerozoic, here we (a) simulate provinces based on palaeogeographic reconstructions and global climate models and (b) contrast them with empirically derived provinces that we define using network analysis of fossil occurrences. Simulated and empirical patterns match reasonably well and consistently suggest a greater than 15% increase in provinciality since the Mesozoic era. Although both factors played a role, the simulations imply that the effect of the latitudinal temperature gradient has been twice as important in determining marine provinciality as continental configuration.
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Paterson, J. Terrill, Jay J. Rotella, Kevin R. Arrigo, and Robert A. Garrott. "Tight coupling of primary production and marine mammal reproduction in the Southern Ocean." Proceedings of the Royal Society B: Biological Sciences 282, no. 1806 (May 7, 2015): 20143137. http://dx.doi.org/10.1098/rspb.2014.3137.
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Polynyas are areas of open water surrounded by sea ice and are important sources of primary production in high-latitude marine ecosystems. The magnitude of annual primary production in polynyas is controlled by the amount of exposure to solar radiation and sensitivity to changes in sea-ice extent. The degree of coupling between primary production and production by upper trophic-level consumers in these environments is not well understood, which prevents reliable predictions about population trajectories for species at higher trophic levels under potential future climate scenarios. In this study, we find a strong, positive relationship between annual primary production in an Antarctic polynya and pup production by ice-dependent Weddell seals. The timing of the relationship suggests reproductive effort increases to take advantage of high primary production occurring in the months after the birth pulse. Though the proximate causal mechanism is unknown, our results indicate tight coupling between organisms at disparate trophic levels on a short timescale, deepen our understanding of marine ecosystem processes, and raise interesting questions about why such coupling exists and what implications it has for understanding high-latitude ecosystems.
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Delsett, Lene Liebe, Patrick Scott Druckenmiller, Aubrey Jane Roberts, and Jørn Harald Hurum. "A new specimen ofPalvennia hoybergeti: implications for cranial and pectoral girdle anatomy in ophthalmosaurid ichthyosaurs." PeerJ 6 (October 12, 2018): e5776. http://dx.doi.org/10.7717/peerj.5776.
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The Late Jurassic Slottsmøya Member Lagerstätte on Spitsbergen preserves a diverse array of marine reptiles, including four named taxa of ophthalmosaurid ichthyosaurs. One of these,Palvennia hoybergeti, is based on the single holotype specimen (SVB 1451) with an incomplete skull. A newly discovered specimen (PMO 222.669) with a disarticulated but largely complete skull and anterior postcranium is described, which considerably expands our knowledge of this taxon. Two additional new ophthalmosaurid specimens with pectoral girdles from the same member are described. The taxonomic utility of the ophthalmosaurid pectoral girdle is contentious, and an assessment of seven pectoral girdles from the Slottsmøya Member provides a basis for addressing this question via a 2D landmark principal component analysis of baracromian coracoids. The analysis reveals a taxonomic signal in the coracoids but also highlights the degree of individual variation. Commonly used phylogenetic characters do not fully encapsulate the degree of variation seen in coracoids and in some cases combine analogous features.
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Haug, Carolin. "Feeding strategies in arthropods from the Rhynie and Windyfield cherts: ecological diversification in an early non-marine biota." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1739 (December 18, 2017): 20160492. http://dx.doi.org/10.1098/rstb.2016.0492.
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The key to understanding fossil ecosystems is to understand the life habits of long extinct organisms. Yet, as direct observations are no longer possible, morphological details are usually the only available data source. One important aspect of lifestyle is feeding strategies, which can be inferred from morphological structures in comparison with those of extant relatives. The Lower Devonian Rhynie and Windyfield cherts preserve even minute structures to a high degree of detail, which allows investigation of the functional morphology of structures possibly involved in feeding. In this contribution, the feeding structures of different arthropods from the Rhynie and Windyfield cherts are described and the corresponding feeding strategies of the animals are discussed. This overview illustrates that in this early non-marine biota, a wide range of feeding strategies already existed. This article is part of a discussion meeting issue ‘The Rhynie cherts: our earliest terrestrial ecosystem revisited’.
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Rapacciuolo, Giovanni, J. Michael Beman, Lauren M. Schiebelhut, and Michael N. Dawson. "Microbes and macro-invertebrates show parallel β-diversity but contrasting α-diversity patterns in a marine natural experiment." Proceedings of the Royal Society B: Biological Sciences 286, no. 1912 (October 9, 2019): 20190999. http://dx.doi.org/10.1098/rspb.2019.0999.
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Documenting ecological patterns across spatially, temporally and taxonomically diverse ecological communities is necessary for a general understanding of the processes shaping biodiversity. A major gap in our understanding remains the comparison of diversity patterns across a broad spectrum of evolutionarily and functionally diverse organisms, particularly in the marine realm. Here, we aim to narrow this gap by comparing the diversity patterns of free-living microbes and macro-invertebrates across a natural experiment provided by the marine lakes of Palau: geographically discrete and environmentally heterogeneous bodies of seawater with comparable geological and climatic history, and a similar regional species pool. We find contrasting patterns of α-diversity but remarkably similar patterns of β-diversity between microbial and macro-invertebrate communities among lakes. Pairwise dissimilarities in community composition among lakes are positively correlated between microbes and macro-invertebrates, and influenced to a similar degree by marked gradients in oxygen concentration and salinity. Our findings indicate that a shared spatio-temporal and environmental context may result in parallel patterns of β-diversity in microbes and macro-invertebrates, in spite of key trait differences between these organisms. This raises the possibility that parallel processes also influence transitions among regional biota across the tree of life, at least in the marine realm.
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Lewis, John D., and Juan Ausió. "Protamine-like proteins: evidence for a novel chromatin structure." Biochemistry and Cell Biology 80, no. 3 (June 1, 2002): 353–61. http://dx.doi.org/10.1139/o02-083.
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Protamine-like (PL) proteins are DNA-condensing proteins that replace somatic-type histones during spermatogenesis. Their composition suggests a function intermediate to that of histones and protamines. Although these proteins have been well characterized at the chemical level in a large number of species, particularly in marine invertebrates, little is known about the specific structures arising from their interaction with DNA. Speculation concerning chromatin structure is complicated by the high degree of heterogeneity in both the number and size of these proteins, which can vary considerably even between closely related species. After careful examination and comparison of the protein sequences available to date for the PL proteins, we propose a model for a novel chromatin structure in the sperm of these organisms that is mediated by somatic-type histones, which are frequently found associated with these proteins. This structure supports the concept that the PL proteins may represent various evolutionary steps between a sperm-specific histone H1 precursor and true protamines. Potential post-translational modifications and the control of PL protein expression and deposition are also discussed.Key words: protamine-like proteins, histones, chromatin structure, sperm, evolution.
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Kwok, Anita Y. C., Jason T. Wilson, Michael Coulthart, Lai-King Ng, Lucy Mutharia, and Anthony W. Chow. "Phylogenetic study and identification of human pathogenicVibriospecies based on partialhsp60 gene sequences." Canadian Journal of Microbiology 48, no. 10 (October 1, 2002): 903–10. http://dx.doi.org/10.1139/w02-089.
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The use of hsp60 gene sequences for phylogenetic study and identification of pathogenic marine vibrios was investigated. A 600-bp partial hsp60 gene was amplified by PCR and sequenced from 29 strains representing 15 Vibrio species within the family Vibrionaceae. Sequence comparison of the amplified partial hsp60 gene revealed 7182% sequence identity among different Vibrio species and 96100% sequence identity among epidemiologically distinct strains with the same species designation. This degree of discrimination allows unambiguous differentiation of all Vibrio species included in the current study from each other, as well as from Aeromonas hydrophila and Plesiomonas shigelloides, which are often misidentified as Vibrio species by conventional biochemical methods. Based on the hsp60 gene sequences, two previously unidentified shrimp isolates were found to be more closely related to Vibrio alginolyticus (9394% sequence identity) than to Vibrio parahaemolyticus (89% sequence identity), whereas 16S rRNA gene analysis was unable to differentiate among these closely related species (9597% sequence identity). Our results indicate that the hsp60 gene may be a useful alternative target for phylogenetic analysis and species identification of marine Vibrios to complement more conventional identification systems.Key words: Vibrio, hsp60, 16S rRNA, phylogenetic analysis, species identification.