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Dissertations / Theses on the topic 'Hydra vulgaris'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Schade, Marsha. "Oogenese in Hydra vulgaris." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-87249.

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2

Münder, Sandra Tamara. "Die Rolle des Notch-Signaltransduktionsweges bei Muster- und Grenzbildungsprozessen in Hydra vulgaris." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-136253.

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3

Sudhop, Stefanie. "Knospung-steuernde Gene in Hydra vulgaris ein evolutionsgeschichtlich alter FGFR kontrolliert die Knospenablösung /." [S.l.] : [s.n.], 2006. http://archiv.ub.uni-marburg.de/diss/z2006/0130.

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4

Dash, Bhagirathi. "Molecular cloning and characterization of important stress and redox regulatory genes from Hydra vulgaris." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4994.

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In this research, important stress and redox regulatory genes present in Hydra vulgaris were isolated and characterized to facilitate our understanding of the evolution and mechanisms of stress response. H. vulgaris heat shock protein 70 (HvHSP70), extracellular copper zinc superoxide dismutase (HvECCuZnSOD), manganese superoxide dismutase (HvMnSOD), phospholipid peroxidase glutathione peroxidase (HvPHGPx) and monofunctional catalase (HvCatalase) were cloned and characterized with regard to stress response, phylogeny and molecular structure. The HSP70 gene isolated from H. vulgaris encodes a polypeptide of 650 amino acids (Mw=710,037) and is interrupted by three intron sequences. The 5' non-coding region of the HvHSP70 possessed the canonical heat shock elements. Phylogenetically HvHSP70 formed a distinct lineage. A molecular model generated for the N-terminal fragment of the HvHSP70 displayed the heat shock protein fold and domains of phosphotransferases. The EC-CuZnSOD cDNA isolated from H. vulgaris encodes a protein of 189 amino acids (Mw=20959.73); the first 19 amino acids constitute the presumed signal peptide. Phylogenetically HvEC-CuZnSOD is grouped with ECCuZnSODs from several organisms. A molecular model generated for the HvEC-CuZnSOD displayed the CuZnSOD (beta)-barrel fold. The MnSOD cDNA isolated from H. vulgaris encodes a protein of 219 amino acids (Mw=24348.75); the first 21 amino acids constitute the presumed mitochondria-targeting signal peptide. Phylogenetically HvMnSOD is clustered with mollusk and crustacean MnSODs. A molecular model generated for the HvMnSOD displayed the N-terminal long alpha antiparallel hairpin and the Cterminal mixed alpha/beta fold characteristic of MnSODs. The PHGPx gene isolated from H. vulgaris encodes a polypeptide of 168 amino acids (Mw=18746.51) including a TGA-encoded selenocysteine at residue 44 and lacks any intron. Phylogenetically HvPHGPx is grouped with PHGPxs from several organisms. A molecular model generated for the HvPHGPx displayed the thioredoxin fold. The 3'-end of a cDNA sequence encoding for 168 amino acids of the Cterminal end of a catalase was isolated from H. vulgaris. Phylogenetically HvCatalase is grouped with heme-containing monofunctional catalases. Hydrae exposed to thermal, starvation, oxidative and metal stress responded by regulating respective mRNA transcriptions suggesting that these genes are involved in stress and (anti)oxidative processes and may have potential as molecular biomarkers for assessing aquatic environment quality.

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5

Motamedi, Mina. "Characterization of anti-apoptotic protein family members (Bax inhibitor-1 and Lifeguard) in Hydra vulgaris." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-160446.

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6

Münder, Sandra Tamara [Verfasser], and Angelika [Akademischer Betreuer] Böttger. "Die Rolle des Notch-Signaltransduktionsweges bei Muster- und Grenzbildungsprozessen in Hydra vulgaris / Sandra Tamara Münder. Betreuer: Angelika Böttger." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2011. http://d-nb.info/1017233144/34.

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7

Reichart, Lisa [Verfasser], and Monika [Akademischer Betreuer] Hassel. "Functional analysis of siRNA mediated knockdowns of fibroblast growth factors in Hydra vulgaris / Lisa Reichart ; Betreuer: Monika Hassel." Marburg : Philipps-Universität Marburg, 2021. http://d-nb.info/1226287352/34.

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8

Fowler, Susan J. "Molecular analysis of glucose-induced basement membrane thickening in hydra vulgaris : a non-mammalian model for diabetic microangiopathy." Thesis, University of Manchester, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706484.

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9

Reichart, Lisa Andrea [Verfasser], and Monika [Akademischer Betreuer] Hassel. "Functional analysis of siRNA mediated knockdowns of fibroblast growth factors in Hydra vulgaris / Lisa Reichart ; Betreuer: Monika Hassel." Marburg : Philipps-Universität Marburg, 2021. http://d-nb.info/1226287352/34.

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10

Motamedi, Mina [Verfasser], and Angelika [Akademischer Betreuer] Böttger. "Characterization of anti-apoptotic protein family members (Bax inhibitor-1 and Lifeguard) in Hydra vulgaris / Mina Motamedi. Betreuer: Angelika Böttger." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1038652677/34.

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11

Belmonte, Julio Monti. "Modelo de animóides aplicado à segregação celular." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/10726.

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Este trabalho apresenta uma generalização do modelo mínimo de movimento coletivo de Vicsek-Gregoire adaptado para a descrição da dinâmica celular de organismos pluricelulares de dois tipos de tecidos, como encontrado na Hydra Vulgaris. O trabalho se divide em duas partes. Na primeira é feita uma revisão histórica dos experimentos biológicos sobre o assunto assim como dos principais modelos matemáticos usados para descrever o problema. Ao final é apresentado o novo modelo mínimo de movimento coletivo (modelo de animóides) que será usado no restante da dissertação. Na segunda parte é feita uma exploração dos aspectos do modelo. Primeiro é construído um diagrama de fases para uma população homogênea de animóides (partículas), na qual se encontrou quatro fases distintas: gasosa, líquida, sólida e a de movimento coletivo. Também foi feito um estudo mais detalhado da difusão interna dos animóides dentro de um agregado, incluindo casos heterogêneos, onde se encontrou a existência de uma aparente superdifusão, assim como tempos de confinamento, para certos conjuntos de parâmetros. Finalmente ao final da segunda parte o modelo foi aplicado à simulação da segregação celular a partir de dois tecidos misturados. Além de se obter resultados que concordam perfeitamente com a principal hipótese biológica sobre o fenômeno, também foi estudado o papel que o movimento coletivo das células desempenha na segregação dos tecidos.
This work presents a generalization of the minimal collective movement model of Vicsek-Gregoire adapted for the description of the dynamics of multi-cellular organisms with two kinds of tissues, like Hydra Vulgaris. This work is composed of two main parts. In the first one an historical review is made about the biological experiments concerning the subject and also about the main mathematical models used for de description of the problem. At the end a new minimal collective movement model (boids model), which will be used in the rest of this dissertation, is presented. In the second part the model is explored in a more systematically way. First a phase diagram is build for an homogeneous population of boids (particles) where is found the existence of four distinct phases: gas, liquid, solid and also the collective movement phase. A study of the internal diffusion of boids inside a cluster is also made for both homogeneous and heterogeneous cases. An apparent super-diffusion, as also a trap time, is founded for certain sets of parameters. Finally, at the end of the second part the model is used for the simulation of the tissue segregation phenomena. The results obtained are in perfect agreement with the main biological hypothesis, and a study of the role of the collective movement in the segregation dynamics is also made.

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12

Schade, Marsha [Verfasser]. "Oogenese in Hydra vulgaris / Marsha Schade." 2008. http://d-nb.info/989690253/34.

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13

Dupre, Christophe. "Non-overlapping neural networks in Hydra vulgaris." Thesis, 2018. https://doi.org/10.7916/D87W7K0V.

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To understand the emergent properties of neural circuits it would be ideal to record the activity of every neuron in a behaving animal and decode how it relates to behavior. We have achieved this with the cnidarian Hydra vulgaris, using calcium imaging of genetically engineered animals to measure the activity of essentially all of its neurons. While the nervous system of Hydra is traditionally described as a simple nerve net, we surprisingly find instead a series of functional networks that are anatomically non-overlapping and are associated with specific behaviors. Three major functional networks extend through the entire animal and are activated selectively during longitudinal contractions, elongations in response to light and radial contractions, while an additional network is located near the hypostome and is active during nodding. Additionally, we show that the behavior of Hydra is made of regularly occurring radial contractions, which expel the content of the gastric cavity about every 45 minutes. These results demonstrate the functional sophistication of apparently simple nerve nets, and the potential of Hydra and other basal metazoans as a model system for neural circuit studies.

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14

Hotz, Tobias [Verfasser]. "Identifizierung und Charakterisierung regio-spezifisch exprimierter Gene bei Hydra vulgaris / vorgelegt von Tobias Hotz." 2006. http://d-nb.info/982216424/34.

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15

Sudhop, Stefanie [Verfasser]. "Knospung-steuernde Gene in Hydra vulgaris : ein evolutionsgeschichtlich alter FGFR kontrolliert die Knospenablösung / vorgelegt von Stefanie Sudhop." 2006. http://d-nb.info/980816637/34.

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