Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Multicellularity"”.
-
Regulation of cell size and cell division in the filamentous cyanobacterium Anabaena: a paradigm of bacterial multicellularity
La forma y el tamaño celular son caracteres codificados en el genoma bacteriano y, por tanto, hereditarios. En cada especie bacteriana, estos rasgos son constantes, aunque pueden sufrir modificaciones a lo largo del ciclo celular o bajo ciertas condiciones ambientales. En bacterias, la forma …
-
Understanding the Evolution of Aggregative Multicellularity: A Molecular Phylogenetic Study of the Cellular Slime Mold Genera Sorodiplophrys and Pocheina
<p>Cellular slime molds are amoeboid protists that have a unicellular trophic phase and multicellular dispersal stage formed through the aggregation of individuals in their life cycles. These organisms were once thought to form a monophyletic group in the Mycetozoa. After careful morphological, …
-
Design and quantification of a tissue type specific genetic circuit in plants
… arise from the innate complexity of multicellularity. The ability to quantitatively control gene expression within specific cell types can address some issues arising from multicellularity. In my research, I developed a genetic circuit with the ability to induce and quantitatively …
-
Bacterial collectives
… group‑level reproduction. Their incomplete multicellularity makes them ideal for studying early steps toward multicellularity. In this thesis, I follow the evolutionary trajectory of SBW25 multicellular mats, from their emergence as multicellular groups and their underlying genetic …
-
Mechanisms for the Evolution of Superorganismality in Ants
… the animal phylogeny, and indeed, origins of multicellularity represent the same evolutionary process. Understanding the origin and elaboration of superorganismality is a major focus of research in evolutionary biology. Although much is known about the ultimate factors that permit the …
-
Isolation and Characterization of Two siamese Phenotypic Modifiers and Their Role in Endoreplication and Trichome Development
… manner. Mutations in ENS1 also enhance the multicellularity of sim mutant trichomes indicating that ENS1 plays a role in the regulation of the cell cycle during trichome cell differentiation. We have shown that ENS1 is required by the negative regulators of trichome branching for the …
-
An Analysis of Morphogenetic Movements on the Marginal Indentations of the Chick Embryo Yolk Sac
… the involvement of the growth process, since multicellularity implies the production of additional cellular units. In general, growth is associated with an increase. The increase may involve mass, cell numbers, cell size, genetic material, or a combination of these. However, the developing …
-
Conserved and Novel Properties of Clathrin-Mediated Endocytosis in Dictyostelium Discoideum
… that clathrin may convey specific advantages for multicellularity. Furthermore, the spatiotemporal dynamics and requirements for individual components of the clathrin-mediated endocytic pathway differ between yeast and mammals. I therefore sought to study the components of clathrin-mediated …
-
Physical and Stochastic Aspects of Microorganism Behaviour
… important biological question of the origin of multicellularity. Why was it that single-celled organisms evolved to become multicellular? In particular, we study closely the species $\textit{Salpingoeca rosetta}$, which has the ability to form colonies that resemble true multicellular organisms. …
-
Using Deep Learning to Extract Multicellular Aggregation Features of Myxococcus xanthus
… self-organization—especially in prokaryotic multicellularity—remain incompletely understood. The bacterium Myxococcus xanthus, known for its intricate aggregation and fruiting body formation under nutrient deprivation, offers a powerful model for studying these dynamics. This thesis addresses …
-
Multicellular Phenotypic Studies of Single Gene Variants in Myxococcus xanthus
… list of <em>M. xanthus</em> genes involved in multicellularity, and expanded our knowledge regarding the possible molecular pathways underlying physiological and morphological changes.</p> <p>Although the cellular function of some of the genes in the genome of an organism can be deduced from …
-
Major transitions in the plant tree of life: insights from genes, genomes and traits
… has been marked by major transitions such as multicellularity, terrestrialisation and the origin of stomata, roots and seeds. These events have been accompanied by the gain, loss, expansion and contraction of gene families. Genome sequencing has increased the potential insights from …
-
Identifying a common cause of the loser cell status in Drosophila melanogaster.
… is thought to have evolved at the advent of multicellularity to enforce cell co-operativity and ensure the fitness of the host organism. Accumulating evidence over the last 40 years has suggested key roles for cell competition during development, adult tissue homeostasis and at the onset and …
-
Quantitative Characterisation of Morphological and Phenotypic Changes During Microbial Cell Differentiation and Multicellular Behaviour
Bacteria inhabit almost every conceivable niche on the planet and have evolved adaptations that confer fitness to one or a number of environments. Because of these adaptations, some species of bacteria are successful living in such different environments as the root of a plant and in the gut of a …
-
Technologies to decode the multicellular networks within the human body
This is a story about how it is possible for collections of cells to physically assemble into coordinated multicellular systems. In other words, how millions of individual cells are able to physically interact with each other in an organized way, as well as how pathogens such as viruses can exploit …