Dissertations / Theses on the topic 'Marine algae'
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Lekan, Danelle Kara. "Influence of temperature, salinity and nutrients on growth and toxin of Karenia brevis clones." View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-2/r3/lekand/danellelekan.pdf.
Full textBischoff-Bäsmann, Bettina. "Der Temperaturbedarf und Biogeographie mariner Makroalgen." Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung, 1992. http://catalog.hathitrust.org/api/volumes/oclc/54346279.html.
Full textGraham, Sylvia Lynne. "Growth and grazing of microzooplankton in response to the harmful alga Heterosigma akashiwo in prey mixtures /." Online version, 2008. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=305&CISOBOX=1&REC=8.
Full textMabande, Edmund Rufaro. "Antimicrobial discovery from South African marine algae." University of the Western Cape, 2018. http://hdl.handle.net/11394/6592.
Full textAntimicrobials are chemical compounds that destroy or inhibit the growth of microorganisms. The majority of these antimicrobials are actually natural products or natural product derived with key examples being the pioneer antibiotics penicillin and cephalosporin. Antimicrobials are an extremely important class of therapeutic agents; however, the development of drug resistance and slow pace of new antibiotic discovery is one of the major health issues facing the world today. There is therefore a crucial need to discover and develop new antibacterial agents. In this study, the potential of marine algae as a source of new antibiotics was explored. Crude organic extracts and chromatographic fractions obtained from small-scale extraction of 17 different marine algae were used to prepare a pre-fractionated library that would be tested against several disease causing microorganisms. The activity of the pre-fractionated library and purified compounds was determined against a panel of drug resistant microorganisms namely Acinetobacter baumannii ATCCBAA®-1605™, Enterococcus faecalis ATCC® 51299™, Escherichia coli ATCC® 25922™, Staphylococcus aureus subsp. aureus ATCC® 33591™ and Candida albicans ATCC® 24433™. Finally, cytotoxicity tests of 50 selected library extracts and isolated compounds were done against two cell lines namely MCF-7 (breast cancer) and HEK-293 (kidney embryonic). Based on their antimicrobial activity and interesting chemical profiles, the seaweeds Plocamium sp. and Stypopodium multipartitum were selected for further study. Three new and unusual halogenated monoterpenes (4.16, 4.17 and 4.18) were isolated from Plocamium sp., and an unusual meroditerpenoid (5.8) was isolated from Stypopodium multipartitum. The metabolites were purified using preparative (silica gel) chromatography as well as semipreparative normal phase HPLC. The structures of purified compounds were determined from spectroscopic data, including nuclear magnetic resonance (NMR) spectroscopy. A small library of 153 fractions was generated from collections of South African marine algae. Pre-fractionated crude extracts showed excellent antimicrobial activity against all microbes but particularly against Staphylococcus aureus. The compounds were generally active against the Gram positive bacteria and the yeast. In conclusion, three antimicrobial halogenated monoterpenes and an unusual monoterpene were isolated from a Plocamium sp. and Stypopodium multipartitum respectively. Antimicrobial activity of crude fractions was excellent but that of isolated compounds was not as great as anticipated.
Rufaro, Mabande Edmund. "Antimicrobial discovery from South African marine algae." University of the Western Cape, 2018. http://hdl.handle.net/11394/6529.
Full textAntimicrobials are chemical compounds that destroy or inhibit the growth of microorganisms. The majority of these antimicrobials are actually natural products or natural product derived with key examples being the pioneer antibiotics penicillin and cephalosporin. Antimicrobials are an extremely important class of therapeutic agents; however, the development of drug resistance and slow pace of new antibiotic discovery is one of the major health issues facing the world today. There is therefore a crucial need to discover and develop new antibacterial agents. In this study, the potential of marine algae as a source of new antibiotics was explored. Crude organic extracts and chromatographic fractions obtained from small-scale extraction of 17 different marine algae were used to prepare a pre-fractionated library that would be tested against several disease causing microorganisms. The activity of the pre-fractionated library and purified compounds was determined against a panel of drug resistant microorganisms namely Acinetobacter baumannii ATCCBAA®-1605™, Enterococcus faecalis ATCC® 51299™, Escherichia coli ATCC® 25922™, Staphylococcus aureus subsp. aureus ATCC® 33591™ and Candida albicans ATCC® 24433™. Finally, cytotoxicity tests of 50 selected library extracts and isolated compounds were done against two cell lines namely MCF-7 (breast cancer) and HEK-293 (kidney embryonic).
Fong, Yin-shan. "Harmful Algal Blooms (HABs) in coastal waters and their management /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25436247.
Full textLo, Shiu-hong. "Antibacterial activity of some marine planktonic algae in Hong Kong /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19667152.
Full textNylund, Göran M. "Chemical mediation of fouling in seaweeds /." Göteborg : Göteborg University, Department of Marine Ecology, 2005. http://www.loc.gov/catdir/toc/fy0701/2006388585.html.
Full textFletcher, Kyle. "Genetic investigations of oomycetes associated with marine algae." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=227933.
Full textPaul, Nicholas Andrew School of Biological Earth & Environmental Sciences UNSW. "The ecology of chemical defence in a filamentous marine red alga." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Sciences, 2006. http://handle.unsw.edu.au/1959.4/24304.
Full textMcGee, Dorien Kymberly. "Morphologic comparisons of shallow and deepwater benthic marine diatoms of Onslow Bay, North Carolina /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/mcgeed/dorienmcgee.pdf.
Full textLevine, Michael R. Muller-Parker Gisèle. "The effects of season and microhabitat on the distribution and nutritional contributions of two algal symbionts in the intertidal anemone Anthopleura xanthogrammica /." Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=335&CISOBOX=1&REC=11.
Full textCarter, Alan Robert. "Studies on the biology of the economic marine red alga Gelidium pristoides (Turner) Kuetzing (Gelidiales : Rhodophyta)." Thesis, Rhodes University, 1987. http://hdl.handle.net/10962/d1004774.
Full textPande, Nilesh Navalkishor. "Interactions between the toxic alga, Alexandrium fundyense, and its bacterial associates stimulation, inhibition, and specificity /." Restricted access (UM), 2008. http://libraries.maine.edu/gateway/oroauth.asp?file=orono/etheses/37803141.pdf.
Full textTitle from PDF title page. Available through UMI ProQuest Digital Dissertations. Includes bibliographical references (leaves 55-66). Also issued in print.
Raccagni, Monica. "Organic nitrogen uptake by marine algae : consequences for marine ecosystem functioning and biodiversity." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/12816.
Full textCarter, Anne Margaret. "Studies on the bioactivities of selected Eastern Cape seaweeds." Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1004093.
Full textZhang, Fangzhu. "Harmful algae from container ship ballast water taken from the open ocean and from Oakland, California (May, 1996 to April, 1997) /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19589049.
Full textTurner, David J. "Effects of sedimentation on the structure of a phaeophycean dominated macroalgal community /." Title page, table of contents and abstract only, 2004. http://web4.library.adelaide.edu.au/theses/09PH/09pht944.pdf.
Full text"July 2004" Includes bibliographical references (leaves 150-172). Also available electronically.
Nguyen, Thi Hong Minh, and Van Hanh Vu. "Bioethanol production from marine algae biomass: prospect and troubles." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-99282.
Full textSự gia tăng giá nhiên liệu hóa thạch cùng với cảnh báo toàn cầu về biến đổi khí hậu hướng đến việc nghiên cứu tìm ra những nguồn năng lượng có thể tái tạo. Năng lượng sinh học là một trong những nguồn quan trọng được các nhà khoa học và doanh nghiệp quan tâm. Mặc dù ethanol sinh học đã được biết đến như là một trong những dạng năng lượng tái tạo quan trọng nhất để giảm thiểu các khí nhà kính và cảnh báo toàn cầu, nhưng chỉ có một số ít bài báo về nó. Trong bài tổng quan này, chúng tôi giới thiệu vắn tắt việc sản xuất ethanol sinh học từ tảo. Nó đưa ra cái nhìn sâu hơn về những khó khăn và tiềm năng hứa hẹn của sản xuất ethanol sinh học từ tảo
Djabayan-Djibeyan, Pablo. "A comparison of lectins in green Venezuelan marine algae." Thesis, University of Portsmouth, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343338.
Full textTsang, Angela Ka Yen. "The uptake of arsenicals by the marine algae Isochrysis galbana and Dunaliella tertiolecta." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29198.
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Chemistry, Department of
Graduate
Yang, Zhenbo. "Harmful algal blooms in selected Hong Kong coastal waters." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22534374.
Full textWilson, William Hector. "Characterisation of viruses infecting marine phytoplankton." Thesis, University of Warwick, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283512.
Full textCraggs, Rupert Justin. "Wastewater nutrient removal by marine microalgae." Thesis, University of St Andrews, 1994. http://hdl.handle.net/10023/14217.
Full textJong, Yde Sijbrand Diederick Maria de. "Systematic, phylogenetic and biogeographic studies of Atlantic seaweeds." [Leiden] The Netherlands : Rijksherbarium/Hortus Botanicus, Leiden University, 1998. http://catalog.hathitrust.org/api/volumes/oclc/40701628.html.
Full textMadikiza, Liwalam Onwabile. "The role of grazers and basal sustrate cover in the control of intertidal algal distribution." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&.
Full textTurner, David John. "Effects of sedimentation on the structure of a phaeophycean dominated macroalgal community." Connect to this title online, 2004. http://hdl.handle.net/2440/37702.
Full textThesis (Ph.D.)--School of Earth and Environmental Sciences, 2004.
Plumb, Jeremy. "Population dynamics and endophytic flora of Chondrus crispus (Rhodophyta) : a temporal study." Thesis, Bath Spa University, 1999. http://researchspace.bathspa.ac.uk/1584/.
Full textTruxal, Laura T. "Characterization of novel compounds isolated from Karenia brevis cultures." View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-3/rp/truxall/lauratruxal.pdf.
Full textKune, Daniel. "Extraction and purification of polyunsaturated fatty acids from marine algae." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406588.
Full textLo, Shiu-hong, and 羅兆康. "Antibacterial activity of some marine planktonic algae in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B3121339X.
Full textLinnane, Kevin. "The effects of heavy metals on marine algae - animal interactions." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440576.
Full textScott, Caroline Daphne. "The role of blue-green algae as marine fouling organisms." Thesis, University of Portsmouth, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282555.
Full textYoung, John J. "Experimental harvests of macroalgae along the Oregon coast with an analysis of associated epiphytic diatom communities." Thesis, Thesis (M.S.)--University of Oregon, 2003, 2003. http://hdl.handle.net/1794/10076.
Full textGoodsell, Paris Justine. "Consequences of disturbance for subtidal floral and faunal diversity /." Title page, abstract and table of contents only, 2004. http://web4.library.adelaide.edu.au/theses/09PH/09phg6555.pdf.
Full textRuchonnet, Diane Astrid. "The chemical ecology and antibacterial activity of the brown alga Halidrys siliquosa and other Scottish seaweeds." Thesis, University of Aberdeen, 2007. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=186834.
Full textMystikou, Alexandra. "Seaweed biodiversity around the Antarctic Convergence in the South Atlantic." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=227597.
Full textCrawley, Karen Ruth. "Detached macrophyte accumulations in surf zones: Significance of macrophyte type and volume in supporting secondary production." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2006. https://ro.ecu.edu.au/theses/1744.
Full textSteyn, Paul-Pierre. "The ecophysiology of Gelidium Pristoides (Turner) Kuetzing : towards commercial cultivation." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1117.
Full textKennish, Robin. "Seasonal patterns of algal availability, influences on diet selection and fitness of the tropical crab grapsus albolineatus." Thesis, Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17591533.
Full textZhang, Fangzhu, and 張芳珠. "Harmful algae from container ship ballast water taken from the open ocean and from Oakland, California (May, 1996 to April, 1997)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31220277.
Full textConnolly, Helen. "The formation of halocarbons by marine organisms." Thesis, Bangor University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280676.
Full textAdams, John Anthony. "Benthic calcareous algae as Jurassic marine temperature indicators in Western Europe." Thesis, Cardiff University, 2004. http://orca.cf.ac.uk/55372/.
Full textMcIntosh, Kyle Douglas. "Pharmaceutical applications and toxicity of extracted alkenones from marine Isochrysis algae." University of Toledo Health Science Campus / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=mco1564780576118206.
Full textJanuary, Grant Garren. "Bioprospecting for bioactive polysaccharides from marine algae endemic to South Africa." University of the Western Cape, 2016. http://hdl.handle.net/11394/5322.
Full textFucoidan is a marine-derived sulphated polysaccharide with bioactive properties ideal for the food, chemical and pharmaceutical industries. The polysaccharide consists largely of L-fucose, has a highly heterogeneous structure and is of diverse origin. Fucoidan was extracted from Ecklonia maxima, Laminaria pallida and Splachnidium rugosum and the effect of different extraction methods on fucoidan heterogeneity was assessed. Extraction methods employed hot water, hydrochloric acid or calcium chloride salt. Fucoidan yield and purity were determined by various colorimetric assays. Highest fucoidan yield was obtained with the hot water extraction method as seen by highest L-fucose content. Splachnidium rugosum extracts contained ~5 times more L-fucose than Ecklonia maxima and Laminaria pallida extracts. The salt extraction method yielded extracts free of contaminants, however L-fucose content in all extracts was >20 times lower. Acid extraction yielded highest levels of uronic acid contamination and liberated sulphate from the fucoidan polysaccharide. The fucose-to-sulphate ratio for Ecklonia maxima was approximately 1:5, whilst the ratios for Splachnidium rugosum and Laminaria pallida were approximately 1:1 and 1:2, respectively. The acid and salt extraction methods removed all traces of protein contaminants, while the hot water method retained very low levels of protein. The extraction method used to isolate fucoidan was a determining factor in yield and purity. Chemical compositional analyses of hot water extracts were assessed by gas chromatography mass spectroscopy. Splachnidium rugosum and Laminaria pallida extracts consisted largely of L-fucose, while Ecklonia maxima fucoidan was characterized with high glucose abundance. Crude hot water and acid extracts from Splachnidium rugosum tissue were fractionated and purified by (anionic) ion exchange chromatography as bioactivity has been correlated to lower molecular weight forms. In water extracts, ion exchange chromatography resulted in close to 90% decrease in L-fucose, sulphate and uronic acid, while protein content increased by 57%. Similar results were reported for acid extracts; however protein content did not change significantly. These results show that method of extraction may affect the composition of fucoidan post-purification. Hot water extraction is recommended due to higher fucoidan yield, as reflected by L-fucose content, and higher sulphate-to-fucose ratio. High protein content after ion exchange chromatography was however of concern. Since mucilage in Splachnidium rugosum thallus was free of protein, fucoidan was precipitated from mucilage with ethanol. Fucoidan yield of mucilage was >15-fold higher than content in purified hot water extracts with a sulphate-to-fucose ratio of ~1:1. The average molecular weight of native fucoidan in mucilage was estimated at 2367 kDa. The polysaccharide was hydrolysed by gamma-irradiation levels of 10-50 kGy to fractions ranging between 60 and 15.5 kDa. Hot water crude fucoidan extracts from Ecklonia maxima, Laminaria pallida, and Splachnidium rugosum were assessed for anti-oxidant activity by measuring the ability to scavenge free radicals and the capacity to reduce copper ions with 2,2-Diphenyl-1-picrylhydrazyl and Cupric Reducing Anti-oxidant Capacity assays, respectively. Ecklonia maxima crude fucoidan displayed highest anti-oxidant activity and capacity, having the potential to scavenge reactive oxygen species as well as the capacity to reduce copper to less toxic forms in mammalian systems. Splachnidium rugosum showed weakest anti-oxidant activity and lowest reducing capacity. The anti-cancer activity of crude and purified hot water Splachnidium rugosum extracts, as well as non-irradiated (native) and gamma-irradiated fucoidan, and commercially procured fucoidan were assessed for anti-cancer activity against MCF-7 breast cancer cells. Splachnidium rugosum crude and purified fucoidan displayed a half maximal inhibitory concentration of 0.7 mg/mL and 0.029 mg/mL, respectively. Low cytotoxicity of crude and purified Splachnidium rugosum fucoidan against non-cancerous breast epithelial cell line MCF-12A was observed, as seen by half maximal inhibitory concentration values of 2 mg/mL and 0.663 mg/mL, respectively. The cancer specific selectivity of purified Splachnidium rugosum fucoidan was therefore much higher as reflected by 10-fold higher selectivity index than that of crude fucoidan. Native and low molecular weight gamma-irradiated fucoidan also showed bioactive properties including anti-cancer activity as seen by the reduction of cell proliferation in vitro, whereas crude fucoidan showed the ability to scavenge free radicals, and the capacity to reduce copper ions.
National Research Foundation (NRF)
Jones, A. M. "Studies on fouling algae with specific reference to Ceramium rubrum c.a.Agardh." Thesis, University of Portsmouth, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370502.
Full textLambade, S. B. "High density culture of marine microalgae using semi-continuous and continuous systems." Thesis, Central Marine Fisheries Research Institute, 1999. http://eprints.cmfri.org.in/11077/1/Lambade%20Sunil%20Bharguram.pdf.
Full textMisciattelli, Natalia. "Control of pathogenic bacteria in marine larval culture systems." Thesis, Bangor University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311387.
Full textFakee, Jameel. "The isolation and characterisation of secondary metabolites from selected South African marine red algae (Rhodophyta)." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001472.
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Hutchinson, Neil. "Spatial variation on tropical rocky shores : the role of herbivory and disturbance /." Thesis, Click to view the E-thesis via HKUTO, 1999. http://sunzi.lib.hku.hk/hkuto/record/B42575618.
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