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Letteratura scientifica selezionata sul tema "Ultrastructure (Biology)"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 agosto 2024

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Articoli di riviste sul tema "Ultrastructure (Biology)"

1

Montanaro, Jacqueline, Daniela Gruber e Nikolaus Leisch. "Improved ultrastructure of marine invertebrates using non-toxic buffers". PeerJ 4 (31 marzo 2016): e1860. http://dx.doi.org/10.7717/peerj.1860.

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Many marine biology studies depend on field work on ships or remote sampling locations where sophisticated sample preservation techniques (e.g., high-pressure freezing) are often limited or unavailable. Our aim was to optimize the ultrastructural preservation of marine invertebrates, especially when working in the field. To achieve chemically-fixed material of the highest quality, we compared the resulting ultrastructure of gill tissue of the musselMytilus eduliswhen fixed with differently buffered EM fixatives for marine specimens (seawater, cacodylate and phosphate buffer) and a new fixative formulation with the non-toxic PHEM buffer (PIPES, HEPES, EGTA and MgCl2). All buffers were adapted for immersion fixation to form an isotonic fixative in combination with 2.5% glutaraldehyde. We showed that PHEM buffer based fixatives resulted in equal or better ultrastructure preservation when directly compared to routine standard fixatives. These results were also reproducible when extending the PHEM buffered fixative to the fixation of additional different marine invertebrate species, which also displayed excellent ultrastructural detail. We highly recommend the usage of PHEM-buffered fixation for the fixation of marine invertebrates.

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2

Neuhaus, B. "Ultrastructure, Biology, and Phylogenetic Relationships of Kinorhyncha". Integrative and Comparative Biology 42, n. 3 (1 luglio 2002): 619–32. http://dx.doi.org/10.1093/icb/42.3.619.

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3

Thanos, Panayotis, Seiichiro Okajima e Julia Terzis. "Ultrastructure and Cellular Biology of Nerve Regeneration". Journal of Reconstructive Microsurgery 14, n. 06 (agosto 1998): 423–36. http://dx.doi.org/10.1055/s-2007-1000203.

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4

Zhang, Li, Bijia Song, Xuan Zhang, Mu Jin, Lixin An, Tiandong Han, Fan Liu e Zhiyao Wang. "Resveratrol Ameliorates Trigeminal Neuralgia-Induced Cognitive Deficits by Regulating Neural Ultrastructural Remodelling and the CREB/BDNF Pathway in Rats". Oxidative Medicine and Cellular Longevity 2022 (28 novembre 2022): 1–17. http://dx.doi.org/10.1155/2022/4926678.

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Chronic pain often leads to cognitive impairment. Resveratrol (Res), a natural polyphenol existing in Polygonum cuspidatum, has been widely investigated for its antinociceptive, anti-inflammatory, and neuroprotective properties. Our aim was to explore the ameliorating effects of resveratrol on pain-related behaviors and learning and memory deficits induced by cobra venom-induced trigeminal neuralgia (TN). The TN model of rats was established by injecting cobra venom solution beneath the epineurium of the infraorbital nerve. Resveratrol was intragastrically administered at a dose of 40 mg/kg twice daily beginning on postoperative day 15. CREB inhibitor 666-15 was intraperitoneally administered at a dose of 10 mg/kg from POD 35-42 after morning resveratrol treatment. Mechanical allodynia was measured via von Frey filaments. Rat free movement was videotaped and analyzed. Spatial learning and memory were evaluated via the Morris water maze test. Ultrastructures of the hippocampal DG region and infraorbital nerve were observed by transmission electron microscopy. We found that resveratrol alleviated TN-induced allodynia, ameliorated learning and memory deficits, restored the ultrastructure of hippocampal neurons and synapses, repaired the damaged myelin sheath of the infraorbital nerve, and activated the CREB/BDNF pathway in the hippocampus of TN rats. CREB inhibitor administration suppressed the resveratrol-rescued abnormal hippocampal ultrastructural changes and aggravated spatial learning and memory impairment by inhibiting CREB/BDNF pathway activation in the hippocampus. Our findings indicated that resveratrol alleviated pain and improved cognitive deficits, probably by regulating neural ultrastructure remodelling and the CREB/BDNF pathway.

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5

Barnabas, A. D., P. Bunsi, Y. Naidoo, W. J. Przybylowicz e J. Mesjasz-Przybylowicz. "Effects Of Varying Salinity On Leaf Ultrastructure Of Potamogeton Pectinatus L". Microscopy and Microanalysis 5, S2 (agosto 1999): 1256–57. http://dx.doi.org/10.1017/s1431927600019607.

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Potamogeton pectinatus is a submerged halophyte which occurs in waters of low salinity (5% to 10%). Its upper salinity tolerance has been reported to be 19%. Reasons why P.pectinatus is unable to tolerate salinities in excess of 19%is important to our understanding of its biology. In the present study, leaf ultrastructure of plants growing at low salinity was compared with plants growing at high salinity in order to assess the effects of different salinities on the ultrastructure. Attention was focussed on ultrastructural changes occurring in the leaf epidermis, the main photosynthetic tissue.Plants were grown in seawater at two salinities : 5%(low salinity) and 20% (high salinity). Pieces of mature leaf blades from both treatments were harvested and prepared for Transmission Electron Microscopy (TEM) following standard procedures. The overall distribution and concentration of chlorine (CI) in the leaves was ascertained since this element is the most abundant anion in seawater and is important in considerations of salt tolerance in submerged halophytes.

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6

Pennec, Marcel Le, e Peter G. Beninger. "Ultrastructural characteristics of spermatogenesis in three species of deep-sea hydrothermal vent mytilids". Canadian Journal of Zoology 75, n. 2 (1 febbraio 1997): 308–16. http://dx.doi.org/10.1139/z97-039.

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To enhance our understanding of the reproductive biology of deep-sea hydrothermal vent mytilids, the histology of the male gonad and the ultrastructure of its gametes were studied in Bathymodiolus thermophilus, B. puteoserpentis, and B. elongatus. Specimens of B. thermophilus were collected at the 13°N site on the East Pacific ridge, while B. puteoserpentis were sampled from the Snake Pit site of the mid-Atlantic ridge and B. elongatus were obtained from the North Fiji Basin. Gonad histology conformed to the typical bivalve profile; the differences in the proportions of acinal and interacinal tissue, as well as differences in acinal fullness in B. puteoserpentis, indicate that gametogenesis is discontinuous in these deep-sea mytilids. Evidence of protandric hermaphroditism was observed in B. elongatus, which exhibited acini containing both maturing and residual male gametes and immature oocytes. The ultrastructural characteristics of the male gametes conform to those described for littoral bivalve species, and the spermatozoon is of the primitive type. No species-specific differences in spermatozoon ultrastructure were discerned. No evidence of bacterial inclusions was found in either the gametes or the associated gonad cells in any of the species examined. The male gametes are thus probably not vectors for the endosymbiotic bacteria that characterize the nutritional biology of the adults in this genus.

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Till, Gerd O. "Oxidants and Antioxidants: Ultrastructure and Molecular Biology Protocols". Archives of Pathology & Laboratory Medicine 127, n. 8 (1 agosto 2003): 1054. http://dx.doi.org/10.5858/2003-127-1054a-oaauam.

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Comporti, Mario. "Oxidants and Antioxidants: Ultrastructure and Molecular Biology Protocols". Tissue and Cell 35, n. 2 (aprile 2003): 153. http://dx.doi.org/10.1016/s0040-8166(02)00108-8.

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9

Lucocq, John. "Unbiased 3-D quantitation of ultrastructure in cell biology". Trends in Cell Biology 3, n. 10 (ottobre 1993): 354–58. http://dx.doi.org/10.1016/0962-8924(93)90106-b.

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10

Griffiths, Gareth. "Ultrastructure in cell biology: do we still need it?" European Journal of Cell Biology 83, n. 6 (2004): 245–51. http://dx.doi.org/10.1078/0171-9335-00375.

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Tesi sul tema "Ultrastructure (Biology)"

1

Goss, Steven Philip Allan. "Ultrastructure and Mitosis of Glaucosphaera vacuolata". W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539625804.

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2

Ridden, John. "Studies on the cell biology of the human sebaceous gland". Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258034.

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3

Kurmann, Marie Helena. "Pollen wall ultrastructure and development in selected gymnosperms /". The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487322984316368.

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4

Taylor, Wilson A. "Comparative analysis of sporoderm ultrastructure in fossil and extant lycopods /". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487599963591563.

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5

Hossler, Fred E. "Ultrastructure Atlas of Human Tissues". Digital Commons @ East Tennessee State University, 2014. http://amzn.com/1118284534.

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Presents a variety of scanning and transmission electron microscope images of the major systems of the human body. This book looks at the structure and function of tissues at the subcellular and molecular level, an important perspective in understanding and combating diseases.
https://dc.etsu.edu/etsu_books/1047/thumbnail.jpg

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6

Griffin, Bethany Ann. "Taxonomic Implications of Sporanglial Ultrastructure Within the Subfamily Melobesioideae Corallinales, Rhodophyta)". W&M ScholarWorks, 1997. https://scholarworks.wm.edu/etd/1539626098.

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7

Bedell, Mark T. "Phylogenetic Implications of Sporangial Ultrastructure in the Subfamily Lithophylloideae (Corallinales, Rhodophyta)". W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539626209.

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8

Osborn, Jeffrey Mark. "Comparative ultrastructure of fossil gymnosperm pollen and implications regarding the origin of angiosperms /". The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487757723994964.

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9

au, Lynleys@calm wa gov, e Lynley M. Stone. "Floral Biology and Propagation of Blue-Flowered Conospermum Spp". Murdoch University, 2003. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040824.145625.

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Blue-flowered Conospermum are endemic to Western Australia, and show great potential as cut flowers. Propagation from cuttings or seed proved difficult, and root initiation in vitro is problematic. This thesis examines the floral biology of the species and the possibility of using somatic embryogenesis to overcome propagation problems. A survey of explant tissue types for C. eatoniae and C. caeruleum was carried out to identify tissue that could be induced into embryogenic pathways. Vegetative, semi-floral and floral buds were initiated into culture from February to June, but were found unsuitable for embryogenesis, producing shoots, callus or dying in culture. Leaves from in vitro leaf cultures formed callus in the presence of 2,4-D and BAP, but were unable to differentiate into embryos in the presence of a variety of growth regulator combinations and concentrations. Immature zygotes died in culture. Direct embryogenesis and/or embryogenic callus was observed on mature zygotes of the species C. caeruleum, C. spectabile, C. dorrienii and C. brownii, and somatic embryos were maintained in culture for up to 18 months for C. caeruleum. Maturation and germination of somatic embryos proved difficult; treatments of cold, ABA, desiccation or mannitol did not induce maturation. It appears that developmental pathways in Conospermum are well defined and are difficult to alter in vitro. It was concluded that somatic embryogenesis has limited commercial potential in these species. Conospermum species have an active pollination mechanism where the style is held in a state of tension when the flower opens. When pressure is applied at the base of the style by an insect, the style flicks downwards, striking the insect pollinator and releasing pollen from the anther in a single dusty mass. However, the breeding systems of blue-flowered Conospermum have not previously been well explored. Flowers on a C. eatoniae inflorescence opened from the basal end upwards acropetally, with the terminal two or three buds never opening. Fruit and seed set occurred only from the basal one to three buds. Isolation of C. eatoniae and C. amoenum flowers showed they were unable to self-pollinate in the absence of insect pollinators. Experiments to determine the timing of the peak of stigmatic receptiveness were inconclusive. Pollen germinated and penetrated the stigma 0 ¡V 6 days after anther dehiscence. Pollen loads on the stigma did not relate to the number of pollen tubes observed down the style. Controlled pollinations of cultivated C. eatoniae at a field station using self and cross pollen, revealed compatibility with a range of pollen genotypes, as pollen tubes were observed extending down the style. However, late-acting incompatibility could not be ruled out as controlled crosses failed to set any seed as flowers were shed from the bush. DNA analysis of open pollinated C. eatoniae seed progeny from two plants from a field station and two plants in natural bushland revealed very different pollination habits. Plants from the field station showed no outcrossing, with progeny closely resembling the maternal parent, whereas plants from the wild population showed outcrossing with several different paternal parents. These results suggest self-pollinated seed can be reliably obtained in a plantation situation using stands of ramets of the same clone. Alternatively, assuming that the required insect pollinators are present in a cultivated stand, it should be possible to obtain cross pollinated seed by surrounding the maternal plant with the desired paternal parent. Unusual pollen behaviour was observed for many blue-flowered species, a white-flowered species of Conospermum, and close relative, Synaphea petiolaris. Up to three pollen tubes emerged from the triporate pollen in vitro, and at rates of up to 55 Ýms-1. This rate was maintained for only 2 s but is greater than 20 times faster than reported in the literature for any species, in vitro or in vivo. Pollen with multiple tubes was also observed on the stigma in vivo in C. amoenum flowers. Changing the osmotic pressure of the germination medium by altering sucrose concentration influenced the number of tubes to emerge from the pollen grain; generally the number of tubes decreased as sucrose increased. However, the rate of tube growth was unaffected. The addition of calcium channel blockers to the germination medium had no effect on Conospermum growth rate, nor did they eliminate pulses of tube growth. Observation of Conospermum pollen ultrastructure revealed similarities to Gramineae pollen. The tube cytoplasm was packed with vesicles filled with material of similar electron density to the cell wall. Few golgi were identified, and the apical end of the tube contained these vesicles, smaller secretory vesicles and mitochondria. This is atypical of the tip, which is normally free of large vesicles. Distinct zones in the cytoplasm were not identified, which is similar to Gramineae. Like the grasses, Conospermum appears to pre-manufacture cell wall material and store it in vesicles ready for rapid germination and extension. A biological function of multiple pollen tube emergence with such rapid growth was not elucidated. This research has shown Conospermum to be a complex and very interesting genus. Further investigation into the remarkable growth of multiple pollen tubes would enhance our knowledge of the biological processes involved in tube growth and the process of fast wall formation. The potential benefits to the cut flower industry of commercialising some of these species warrants further effort to find an efficient method of propagation. Introduction into horticulture may be the only means by which these threatened species will survive.

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10

Kokinos, John Peter. "Studies on the cell wall of dinoflagellate resting cysts : morphological development, ultrastructure, and chemical composition". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/17366.

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Libri sul tema "Ultrastructure (Biology)"

1

Tamar, Berner, a cura di. Ultrastructure of microalgae. Boca Raton: CRC Press, 1993.

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2

Gunning, Brian E. S. Plant cell biology: Structure and function. Boston, Mass: Jones and Bartlett Publishers, 1996.

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3

Edward, Bittar E., a cura di. Structural biology. Greenwich, Conn: JAI Press, 1991.

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4

service), ScienceDirect (Online, a cura di. Methods in nano cell biology. Amsterdam: Academic Press, 2008.

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5

Hamel, T. E. Essai sur la constitution atomique de la matière. [S.l: s.n., 1986.

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6

Gunning, Brian Edgar Scourse. Plant cell biology: An ultrastructural approach. Dublin: M.W.Steer, 1986.

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7

W, Steer Martin, a cura di. Plant cell biology: Structure and function. Sudbury, Mass: Jones and Bartlett Publishers, 1996.

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8

Pavelka, Margit. Functional ultrastructure: Atlas of tissue biology and pathology. 2^a ed. New York: SpringerWein, 2010.

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9

1931-, Armstrong Donald, a cura di. Oxidants and antioxidants: Ultrastructure and molecular biology protocols. Totowa, N.J: Humana Press, 2002.

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10

Roth, J. (Jürgen), Prof. Dr. Dr, a cura di. Functional ultrastructure: Atlas of tissue biology and pathology. 2^a ed. New York: SpringerWein, 2010.

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Capitoli di libri sul tema "Ultrastructure (Biology)"

1

Verdonk, P. "Histology-Ultrastructure-Biology". In The Meniscus, 19–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02450-4_3.

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2

Pereira, Hélder, Ibrahim Fatih Cengiz, Joana Silva-Correia, Maggali Cucciarini, Pablo E. Gelber, Joao Espregueira-Mendes, Joaquim Miguel Oliveira e Rui Luís Reis. "Histology-Ultrastructure-Biology". In Surgery of the Meniscus, 23–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49188-1_3.

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3

Plowman, Jeffrey E., e Duane P. Harland. "Fibre Ultrastructure". In Advances in Experimental Medicine and Biology, 3–13. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8195-8_1.

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4

Deacon, Jim. "Fungal Structure and Ultrastructure". In Fungal Biology, 48–66. Malden, MA USA: Blackwell Publishing Ltd., 2013. http://dx.doi.org/10.1002/9781118685068.ch3.

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Cole, W. C., e R. E. Garfield. "Ultrastructure of the Myometrium". In Biology of the Uterus, 455–504. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5589-2_15.

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Marks, Sandy C., e Steven N. Popoff. "Ultrastructural biology and pathology of the osteoclast". In Ultrastructure of Skeletal Tissues, 239–52. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-1487-5_13.

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Kost, Gerhard, e Karl-Heinz Rexer. "Morphology and Ultrastructure of Piriformospora indica". In Soil Biology, 25–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-33802-1_2.

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Krause, William J. "Biology of the duodenal (Brunner’s) glands". In Ultrastructure of the Digestive Tract, 67–84. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-2071-5_5.

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Dvorak, Ann M. "Ultrastructure of Human Basophils". In Advances in Anatomy Embryology and Cell Biology, 13–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74145-6_3.

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10

Gao, Yuansheng. "Ultrastructure of Vascular Smooth Muscle". In Biology of Vascular Smooth Muscle, 19–34. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-7122-8_2.

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Atti di convegni sul tema "Ultrastructure (Biology)"

1

Backman, V., H. Subramanian, P. Pradhan, Y. Liu, I. Capoglu, J. D. Rogers, H. K. Roy e A. Taflove. "Detecting alterations in cell ultrastructure with optical imaging". In 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2009. http://dx.doi.org/10.1109/iembs.2009.5333173.

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2

Tanabashi, Sayuri. "Welcome to the Microworld: STEAM Education Approach to Learn Plant Ultrastructure Cell Biology". In 2021 IEEE International Conference on Engineering, Technology & Education (TALE). IEEE, 2021. http://dx.doi.org/10.1109/tale52509.2021.9678877.

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3

Pitinova, Maria, Yulia Kalyuzhnaya e Alexander Logvinov. "Ultrastructural changes in the crayfish abdominal ganglia after axotomy". In Optical Technologies for Biology and Medicine, a cura di Elina A. Genina e Valery V. Tuchin. SPIE, 2022. http://dx.doi.org/10.1117/12.2623573.

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Eid, Aya, James A. Winkelmann, Graham Spicer, Luay M. Almassalha e Vadim Backman. "Spectral based tissue classification and ultrastructural characterization using ISOCT (Conference Presentation)". In Biophysics, Biology and Biophotonics IV: the Crossroads, a cura di Adam Wax e Vadim Backman. SPIE, 2019. http://dx.doi.org/10.1117/12.2513825.

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Leng, Huijie, Jeffry S. Nyman, Xuanliang Dong, Michael J. Reyes e Xiaodu Wang. "A Semi-Empirical Constitutive Model for Post Yield Behavior of Bone in Tension". In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176237.

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Among the material properties that can be assessed through mechanical testing, toughness quantifies the energy required for failure and is therefore most suited for characterizing bone quality. As much of the toughness of bone occurs after yielding, post yield behavior of bone is attracting more and more attention [1, 2]. Although a lot of experimental studies have been conducted on post yield behavior of bone, little efforts have been made to develop constitutive relation for post yield behavior of bone tissues. Elucidating the underlying mechanism of post-yield behavior of bone is critical for further development of clinical strategies to predict and prevent age and disease related bone fractures. In addition, such understanding could help bridge the gap between biology and mechanics of bone since cellular activities are directly related to the ultrastructural architecture and composition of the tissue. Moreover, an accurate constitutive model is always required in numerical modeling and simulating the mechanical behavior of bone under different loading conditions. Based on the results reported in the literature and obtained in our laboratory, this study intends to develop and verify a semi-empirical constitutive model of the post-yield and failure behavior of the cortical bone tissue in tension.

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"An increase in the number of CAG repeats in the huntingtin gene enhances pathological ultrastructural aberrations in the cells and neurons". In Bioinformatics of Genome Regulation and Structure/Systems Biology (BGRS/SB-2022) :. Institute of Cytology and Genetics, the Siberian Branch of the Russian Academy of Sciences, 2022. http://dx.doi.org/10.18699/sbb-2022-499.

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Rapporti di organizzazioni sul tema "Ultrastructure (Biology)"

1

Katan, Jaacov, e Michael E. Stanghellini. Clinical (Major) and Subclinical (Minor) Root-Infecting Pathogens in Plant Growth Substrates, and Integrated Strategies for their Control. United States Department of Agriculture, ottobre 1993. http://dx.doi.org/10.32747/1993.7568089.bard.

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In intensive agriculture, harmful soilborne biotic agents, cause severe damage. These include both typical soilborne (clinical) major pathogens which destroy plants (e.g. Fusarium and Phytophthora pathogens), and subclinical ("minor") pathogens (e.g. Olpidium and Pythium). The latter cause growth retardation and yield decline. The objectives of this study were: (1) To study the behavior of clinical (major) and subclinical (minor) pathogens in plant growth substrate, with emphasis on zoosporic fungi, such as Pythium, Olipidium and Polymyxa. (2) To study the interaction between subclinical pathogens and plants, and those aspects of Pythium biology which are relevant to these systems. (3) To adopt a holistic-integrated approach for control that includes both eradicative and protective measures, based on a knowledge of the pathogens' biology. Zoospores were demonstrated as the primary, if not the sole propagule, responsible for pathogen spread in a recirculating hydroponic cultural system, as verified with P. aphanidermatum and Phytophthora capsici. P. aphanidermatum, in contrast to Phytophthora capsici, can also spread by hyphae from plant-to-plant. Synthetic surfactants, when added to the recirculating nutrient solutions provided 100% control of root rot of peppers by these fungi without any detrimental effects on plant growth or yield. A bacterium which produced a biosurfactant was proved as efficacious as synthetic surfactants in the control of zoosporic plant pathogens in the recirculating hydroponic cultural system. The biosurfactant was identified as a rhamnolipid. Olpidium and Polymyxa are widespread and were determined as subclinical pathogens since they cause growth retardation but no plant mortality. Pythium can induce both phenomena and is an occasional subclinical pathogen. Physiological and ultrastructural studies of the interaction between Olpidium and melon plants showed that this pathogen is not destructive but affects root hairs, respiration and plant nutrition. The infected roots constitute an amplified sink competing with the shoots and eventually leading to growth retardation. Space solarization, by solar heating of the greenhouse, is effective in the sanitation of the greenhouse from residual inoculum and should be used as a component in disease management, along with other strategies.

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