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Dissertations / Theses on the topic 'Embryonic axes'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hyman, Anthony Arie. "Establishment of division axes in the early embryonic divisions of Caenorhabditis Elegans." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256630.

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2

Pennerstorfer, Markus. "Cleavage and cell fates in Phoronida." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17282.

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Die vorliegende Arbeit befasst sich mit Aspekten der frühen Entwicklung der Phoronida („Hufeisenwürmer“). An drei Arten wird der Furchungsprozess untersucht (Phoronis pallida, Phoronis muelleri, Phoronis vancouverensis). Dies erfolgt sowohl mithilfe der 4D-Mikroskopie als auch anhand von immunocytochemischen Markierungen der Mitosespindeln und konfokaler Laser-Scanning-Mikroskopie. Verschiedene morphologische Merkmale des Furchungsprozesses werden quantitativ erfasst und innerhalb sowie zwischen den Arten verglichen. Die Ergebnisse zeigen eine weitgehend übereinstimmende Furchung bei P. pallid

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3

Canning, David Richard. "The mechanisms of formation of the embryonic axis." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329968.

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4

Rakeman, Andrew Steven. "The role of Nap1-mediated cell migration : during morphogenesis and axis specification in the mouse /." Access full-text from WCMC:, 2006. http://proquest.umi.com/pqdweb?did=1296088091&sid=9&Fmt=2&clientId=8424&RQT=309&VName=PQD.

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5

Tatar, Tülin. "Nanog-Tcf15 axis during exit from naïve pluripotency." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31231.

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Pluripotent cells have the dual abilities to self-renewal and to differentiate into all three germ layers. Pluripotent cells can be isolated from two different stages of mouse embryogenesis. Embryonic stem cells (ESCs) are isolated from the inner cell mass (ICM) of the pre-implantation embryo and are considered to be in a naïve state. On the other hand, cells isolated from epiblast of the post-implantation embryo are referred as epiblast stem cells (EpiSC) and are representative of primed pluripotency. ESCs and EpiSCs are distinct from each other in terms of the morphology, the gene regulator

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6

Chahda, Juan Sebastian. "Analysis of Scaling Properties of Embryonic Morphogen Gradients During Drosophila Evolution." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1437000710.

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7

Lee, Hojoon. "On the extracellular network of interacting proteins that patterns the embryonic dorsal-ventral axis." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1317324081&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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8

Mastromina, Ioanna. "Investigation into the expression, role and regulation of the Myc oncogene during vertebrate embryonic body axis elongation." Thesis, University of Dundee, 2017. https://discovery.dundee.ac.uk/en/studentTheses/76216355-3572-4642-aaf8-72a9948af467.

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9

Goulding, Morgan Ben. "Comparative and experimental analysis of precocious cell-lineage diversification in the embryonic dorsoventral axis of the gastropod Ilyanassa /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008339.

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10

Denans, Nicolas. "Role of the Hox genes in the control of the body axis elongation of the chicken embryo." Strasbourg, 2011. http://www.theses.fr/2011STRA6147.

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La segmentation de la colonne vertébrale est une caractéristique des vertébrés. Au cours de l’embryogénèse, les somites, précurseurs des vertèbres, se forment de façon périodique par segmentation de la partie antérieure du mésoderme présomitique (PSM), un tissu mésenchymateux situé de part et d’autre du tube neural. Le PSM se forme par l’ajout progressif de cellules dans sa partie postérieure provenant de progéniteurs originaires de la ligne primitive puis du bourgeon caudal au cours de la gastrulation. Le nombre de somites est défini de façon très précise au sein d’une même espèce bien qu’il

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11

Youbicier, Simo Benoît-Jules. "Etude cinétique et chronobiologique de l'influence de la bursectomie et de la bursine sur les activités corticotropes, épiphysaires et immunitaires chez le poulet." Montpellier 2, 1994. http://www.theses.fr/1994MON20121.

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La reactivite fonctionnelle des systemes corticotrope, epiphysaire et immunitaire b a ete determinee soit apres sollicitation antigenique par injection iterative de thyroglobuline porcine, soit a l'occasion des oscillations circadiennes. Le modele aviaire a ete choisi en raison de la presence d'un organe lymphoide b distinct qui n'existe pas chez les mammiferes, la bourse de fabricius. Les reponses corticotrope, (acth), corticosurrenalienne (corticosterone), epiphysaire (melatonine, nat) et immunitaire (immunoglobulinesm m et g speciiques) au stimulus antigenique sont supprimees apres bursecto

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12

Dubrulle, Julien. "Implication de la voie de signalisation FGF dans le couplage entre l'élongation de l'axe antéropostérieur et la somitogénèse chez l'embryon de poulet." Paris 6, 2002. http://www.theses.fr/2002PA066109.

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13

Mendes, Anabela Lindo dos Santos. "Cultura in vitro de embriões imaturos em ameixeira europeia." Master's thesis, Universidade de Évora, 1997. http://hdl.handle.net/10174/12550.

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Foram colhidos semanalmente, desde os 7 aos 70 dias após a polinização (DAP), frutos de Prunus domestica cv. ‘Rainha Cláudia Verde' provenientes de polinização livre. Com o objectivo de obter plântulas, foram extraídos os óvulos e/ou embriões e os eixos embrionários e testados três meios de cultura base, adicionando ou não diferentes tipos de reguladores de crescimento (auxina, giberelina e citocinina) e amino-ácidos (caseína hidrolisada 500 mg/l), tendo-se também variado a concentração de sacarose (2 e 10%). Foi ainda testada a técnica de perfuração da testa do óvulo e a influência do frio (3

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14

Flandre, Frédéric. "Mise au point d'un système de régénération du pois (Pisum sativum L. ) par embryogenèse somatique." Amiens, 1994. http://www.theses.fr/1994AMIES013.

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Nous avons mis au point un protocole de régénération du pois (Pisum Sativum L. ) qui utilise soit des embryons zygotiques immatures, soit des axes embryonnaires de graines matures. Nous avons aussi mis au point un protocole original qui permet l'obtention de microplantes et qui pourrait être utilisé dans l'optique de la création de semences artificielles du pois. Les travaux réalisés sur les axes embryonnaires de graines matures ont conduit à la régénération de plantes entières, fertiles. L'estimation de leur niveau de ploïdie, par cyrtométrie de flux, a permis de confirmer leur état diploïde.

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15

Aragón, Manresa Ferran. "The role of vHnf1 and Fgf Signaling in the caudal Hindbrain Patterning." Doctoral thesis, Universitat Pompeu Fabra, 2008. http://hdl.handle.net/10803/7147.

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Durant els primers estadis del desenvolupament embrionari dels metazous els teixits embrionaris son progressivament regionalitzats fins que adquireixen destins específics. En els vertebrats, el tub neural, que és el primordi del sistema nerviós central, es tempranament regionalitzat en el seu eix antero-posterior i queda dividit en les tres vesícules cerebrals i la medul·la espinal. La vesícula cerebral més posterior rep el nom de rombencèfal. En el rombencèfal un següent estadi de regionalització condueix cap a una organització en una serie de segments anomenats rombomers. Aquesta organitzaci

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16

Fowler, Candace. "Cryopreservation of Zea mays L. embryonic axes." Thesis, 2011. http://hdl.handle.net/10539/9125.

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The successful cryopreservation of a South African maize cultivar (Hybrid 6363) was not possible due to the large size of the intact caryopses. To overcome the problem the embryonic axes were isolated. Isolation of the axes from dry caryopses proved challenging and resulted in the damage of 50% of all axes isolated. To ensure the successful removal of the intact axes from the caryopses, imbibition over a period of 30 minutes to 6.5 hours was employed to soften the testa and the pericarp. The effects of imbibition and subsequent cryostorage on the sample water content, vigour and viability were

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17

Wang, Jiunn-Dwu, and 王俊讀. "Effect of Chemicals on the Germination of Embryonic Axes of Artificially Aged Edible Soybean Seeds." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/67732086867317325213.

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碩士<br>國立中興大學<br>農藝學研究所<br>84<br>The present study was designed to evaluate the effect of antioxidants and chemical reagents on the germination of embryonic axes of artificially aged soybean seeds subjected to 3, 6 and 9 days accelerated aging (40 C, 79% relative humidity).The results indicated that the treatments reduced the peroxide contents, changed the enzyme activities and the soluble protein contents. Nevertheless, the imbibitional leakage and germination percentage wewe not affect sig

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18

Cherian, Jency. "Towards developing effective decontamination procedures for in vitro culture of embryonic axes excised from recalcitrant seeds." Thesis, 2013. http://hdl.handle.net/10413/10775.

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Control of seed-associated micro-organisms is vital in reducing losses of plants of economic importance. Recalcitrant seeds being metabolically active and able to be stored only under conditions of high relative humidity makes it more difficult to control contaminants. Nevertheless, means need to be developed to eliminate, or at least curtail, seed-associated fungi and bacteria. The use of biological control is a highly recommended alternative to chemical control for reducing the risk of killing beneficial organisms, as well as in terms of health and environmental hazards. Furthermore, when wo

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19

Walker, Marieanne Julie. "Some investigations of the responses of Quercus robur and Ekebergia capensis embryonic axes to dehydration and cryopreservation." Thesis, 2000. http://hdl.handle.net/10413/4657.

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Recalcitrant seeds are those that are shed at high water contents, are actively metabolic throughout development, when they are, and remain, desiccation-sensitive, and may also be chilling sensitive. These properties preclude their conventional storage. Because recalcitrant seeds lose viability rapidly (within a few days to several months depending on the species) the long-term storage of their germplasm is achievable only by cryopreservation [i.e. storage at very low temperatures, generally in or over, liquid nitrogen at -196°C or -150°C, respectively. Generally the seeds are far too l

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20

Kistnasamy, Provain. "Some invetsigations on the responses to desiccation and exposure to cryogenic temperatures of embryonic axes of Landolphia kirkii." Thesis, 2011. http://hdl.handle.net/10413/8903.

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Landolphia kirkii is scrambling shrub forming an integral part of the flora along the coastal areas of north-eastern South Africa. The non-sustainable harvesting of fruit as food source, by monkeys and rural communities and the highly recalcitrant nature of their seeds threatens the continuation of the species. In addition, the ability of the plants to produce high quality rubber makes its long-term conservation highly desirable. Previously, attempts have been made to cryopreserve germplasm of L. kirkii, but no survival had been recorded at cryogenic temperatures of below -140ºC. The present s

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21

Ntuli, Tobias M. "Some effects of drying rate and wet storage on aspects of the physiology and biochemistry of embryonic axes from diesiccation- sensitive seeds." Thesis, 2004. http://hdl.handle.net/10413/2459.

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Desiccation-sensitive seeds show differential viability characteristics during drying at different rates. A number of studies have demonstrated that rapid dehydration permits survival to lower water contents than does slower desiccation. The aim and objective of the present study was to test the hypothesis which states that rapid drying of desiccation-sensitive seeds removes water sufficiently fast to reduce the accumulation of metabolic damage. In addition, the hypothesis that wet storage subjects desiccation-sensitive seeds to mild, but increasingly severe, water stress causing oxidative dam

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22

Šídová, Monika. "Časo-prostorové utváření molekulárních gradientů v časném embryonálním vývoji Xenopus laevis." Doctoral thesis, 2015. http://www.nusl.cz/ntk/nusl-266302.

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Clarifying the underlying spatio-temporal mechanisms that determine body pattern is important for detailed understanding of embryonic development. A crucial question of vertebrate embryogenesis remains: when and how are single blastomeres determined for differentiation that subsequently leads to body axes specification and the formation of different tissues and organs? The answer to this question will be beneficial for primary research as well as in the field of applied medicine. The main aim of the presented thesis was to study spatio-temporal molecular gradients of cell fate determinants dur

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23

Premsagar, Varsha. "Optimising methods for embryonic axis fixation and micropropagation of Syzygium cordatum Hochst." Thesis, 2009. http://hdl.handle.net/10413/8295.

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Syzygium cordatum Hochst. (family - Myrtaceae), commonly called the umDoni (Zulu) tree, is found throughout South Africa. The tree is utilised for its fruit, bark and wood by many villagers, and this demand has placed potential pressure on existing populations. It is necessary to conserve this widely used tree before it becomes threatened by over-utilisation. Seeds of S. cordatum are recalcitrant and storable only in the short-term at 16oC over moist paper towel (hydrated storage). The study was initiated to follow deterioration of the embryonic axes, in relation to dehydrated versus and hydra

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24

QUAN, ZHONG-HE, and 全中和. "Organogenesis, somatic embryogenesis and histological studies on soybean embryogenic axes and immature cotyledon culture." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/35350112795387463253.

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25

Chang, Ya Han, and 張雅涵. "Involvement of RhoA-kinase (ROCK)-myosin II axis in the induction of a neural progenitor phenotype in human embryonic stem cell-derived mesenchymal progenitors (EMPs)." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/35524516770445369374.

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碩士<br>國立清華大學<br>分子與細胞生物研究所<br>100<br>Current advances in stem cell biology have brought much hope for therapy of neuro-degenerative diseases. However, neural stem cells (NSCs) are rare adult stem cells, and the use of non-NSCs requires efficient and high-yielding lineage-specific differentiation prior to transplantation for efficacy. We report on the efficient differentiation of human embryonic stem cell-derived mesenchymal progenitors (EMPs) into a neural phenotype with use of Y-27632, a clinically compliant small molecular inhibitor of Rho kinase (ROCKs). EMPs are a population of mesenchymal

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