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Showing 1 to 20 of 77 for “"yolk sac"”.
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An in vitro model of human yolk sac and epiblast crosstalk
… the hypoblast being the portion of the human yolk sac that lies adjacent to the epiblast. However, the functional role of such a structure within the context of human development is yet to be understood. In vitro stem cell modelling of the human yolk sac- epiblast interaction offers a system …
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A Manometric Analysis of Metabolic Activity in the Developing Chick Yolk Sac
The advance of the avian yolk sac over the surface of the yolk sphere offers a system exhibiting an extremely rapid growth rate with subsequent sudden decrease in this rate. To attempt.to understand the factors controlling such a growth phenomena, one approach is an inspection of the changes in …
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The role of thrombopoietin in promoting yolk sac hematopoietic progenitor cell growth and differentiation
This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).
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Analysis of Mouse EKLF/KLF2 E9.5 Double Knockout: Yolk Sac Morphology and Embryonic Erythroid Maturation
… Using light and electron microscopy, the yolk sacs and dorsal aortae from EKLF/KLF2 double knockout (KO) E9.5 (embryonic day 9.5) were examined to determine whether these KLFs have compensatory functions in morphology of blood cells and vessels. EKLF/KLF2 double KO E9.5 erythroid, …
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An Analysis of Morphogenetic Movements on the Marginal Indentations of the Chick Embryo Yolk Sac
The normal production of a multicellular organism from a single-celled zygote depends upon the processes of growth, differentiation, and morphogenesis. The classification of an organism as multicellular necessitates the involvement of the growth process, since multicellularity implies the …
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Ontogeny and biological function of epithelial cells in the chicken yolk sac and small intestine
The chicken yolk sac and small intestine are connected through the yolk stalk and share many biological similarities. During the embryonic stage, the extra-embryonic yolk sac helps the embryo to absorb nutrients primarily in the last two weeks of incubation. The chicken yolk sac physically moves …
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The Influence of Nucleic Acids of Yolk Origin on the Growth and Development of the Avian Yolk Sac
The problem of elucidating the genetic control mechanism of developing organisms is extremely- interesting to the developmental biologist. Our current knowledge of genetic control tells us that hereditary information is coded primarily into nuclear DNA, characteristic differentiated phenotypes …
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Gene Expression of Nutrient Transporters and Digestive Enzymes in the Yolk Sac Membrane and Small Intestine of the Developing Embryonic Chick
Chick embryos derive nutrients from the yolk during incubation and transition to intestinal absorption posthatch. Nutrient uptake is mediated by digestive enzymes and membrane bound transporter proteins. The objective of this study was to determine expression profiles of nutrient transporters and …
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Effect of probiotics or high incubation temperature on gene expression and cell organization of the small intestine and yolk sac of chicks
The small intestine and yolk sac (YS) are important organs for nutrient absorption and innate immunity in chickens during the post-hatch or prehatch periods. These organs share a similar structure of epithelial cell-lined villi with tight junctions between adjacent cells. Probiotics have been …
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Eomes Directs the Formation of Spatially and Functionally Diverse Extra-Embryonic Mesoderm Derived Tissues
… of the embryo, including the amnion, chorion, yolk-sac, and allantois. Together, they protect the embryo and play key roles in the supply of nutrients and oxygen, waste management, haematopoiesis, and establishing the maternal-foetal interface. Embryonic stem cell (ESC)-derived in vitro …
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Localization of Calbindin-D<sub>28k</sub> in Extra-Embryonic Membranes of Two Oviparous Scincid Lizards.
… calcium. The chorioallantoic membrane and yolk sac of oviparous squamate reptiles (lizards and snakes) transport calcium from the eggshell and yolk to the developing embryo. I used immunohistochemistry to localize calbindin-D<sub>28K</sub> expression in the chorioallantoic membrane and yolk …
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Using single cell transcriptomics to characterise endothelial populations in embryonic haematopoiesis
… from the aorta gonad mesonephros (AGM) and yolk sac, respectively. We showed that Cd44 could be used to mark all stages of haematopoietic development arising from the AGM. This enabled us to provide transcriptional data on haemogenic endothelium, identifying potential new regulators of …
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Effects of high incubation temperature on the developing small intestine and yolk sac of broiler chicks with insight into goblet cell development in the small intestine early posthatch
… 39.5°C) on the developing small intestine and yolk sac, which provide the chick with nutrients posthatch and during embryogenesis. Studying these organs and mechanisms occurring during this time could potentially indicate why chicks from eggs subjected to a higher incubation temperature are not …
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The Role of HNF4A in Germ Cell Tumor Development
Yolk sac tumor is a histological category of germ cell tumors, which represent the most frequent malignancy in young men. Little is known about the molecular mechanisms responsible for the aberrant differentiation and oncogenic potential of yolk sac tumors. Multiple recurrent chromosomal copy …
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Runx1 in Primitive Hematopoiesis and Characterization of Hematopoietic Stem Cells in a Mouse Chronic Inflammatory Arthritis Model
… hematopoiesis, occurring exclusively in the yolk sac, is characterized by its transient nature. As the primitive hematopoiesis declines in the yolk sac, definitive hematopoietic progenitors generated in the yolk sac and/or embryo take over in blood cell production. Whether the transition from …
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Impacts of sedimentation on early-life phenotypes and gene expression in coho salmon (Oncorhynchus kisutch)
… significantly lower fork lengths and weights. Yolk sac area and volume were also lower in fish from the 20% fine sediment treatment, suggesting a decrease in yolk sac conversion efficiency. Gene expression analysis of three general (HIF1A_6, ALD_1, HemA1_1) and four hypoxia-specific (Anillin, …
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The impacts of embryo development and asynchronous hatching on morphology, growth, and development of larval burbot (Lota lota).
… Initial morphology such as total length and yolk sac area, as well as growth and yolk sac utilization rates were significantly different between early, middle, and late hatching larvae within and between families of burbot (p</p>
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CHARACTERIZING THE ROLE OF PUTATIVE VIRULENCE GENES ASSOCIATED WITH INFECTION, COLONIZATION AND PERSISTENCE OF SALMONELLA ENTERITIDIS IN CHICKEN USING A BIOLUMINESCENT REPORTER
… Other predilection sites were the crop and yolk sac, which were colonized at 24 hours p.i. (in crop) and 4 days p.i. (in yolk sac), respectively. Our findings regarding the temporal pattern of colonization were not possible without the BLI and establishing in-vivo imaging capabilities will …
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Nutritional parameters associated with enteric Escherichia coli and rotavirus in poults
… used in these experiments was isolated from the yolk sac of stunted poults. Inoculation of day-old poults was done orally in one experiment and via the yolk sac in another series of experiments. Experiments were designed in a factorial arrangement of E. coli inoculation and dietary protein level …
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Sublethal effects of cadmium and diazinon on reproduction and larval behavior in zebrafish (Brachydanio rerio)
… exposed to Cd during embryonic, hatching, and yolk sac stages and exposed to diazinon during a yolk sac stage to monitor larval swimming behavior (swimming speed). Cadmium exposure increased median spawning time and male gonadosomatic index (GSI); decreased fecundity, fertilization success, and …
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