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.
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Showing 1 to 16 of 16 for “"morphological plasticity"”.
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Morphological plasticity of astrocytes
Studies of the central nervous system plasticity have concentrated on synaptic and neuronal changes and often ignored the role that glial cells play in interneuronal communication. Current research has begun to examine one type of glial cell, the astrocyte. Astrocytes are involved in the regulation …
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Analysis of activity-dependent morphological plasticity of dendritic spines on hippocampal neurons
Dendritic spines are the main sites of synaptic input onto excitatory neurons. As recent experiments showed that synaptic activity and especially long-term potentiation (LTP) can modify spine morphology and number, I studied the effect of long-term depression (LTD) on these parameters. I used a …
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Intraclonal Morphological Plasticity within the Myzus persicae (Sulzer) Complex Related to Host Plant and Temperature
… 15°C, 20°C, and 25°C. The intraclonal plasticity of two tobacco collected morphs and one turnip collected morph was investigated in relation to these combinations of host and temperature in a 4 x 3 x 3 factorial experimental design. Fifth generation mature apterous aphids were mounted …
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The role of light signaling on astrocytic morphological plasticity in the adult male rat suprachiasmatic nucleus
The body’s master clock lies at the base of the hypothalamus immediately above the optic chiasm. Because of the intimate connection to the optic chiasm, this hypothalamic nucleus was named the suprachiasmatic nucleus (SCN). Environmental light signaling conveys time of day and seasonal changes to …
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Experience, neuroanatomical plasticity and expression of the immediate early gene ZENK in the visual cortex of weanling rats
… regulatory transcription factor correlates with morphological plasticity, using a model of experience-dependent plasticity.
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Morphologische Plastizität
… this study was to reveal factors affiliated with morphological plasticity in Daphnia cucullata. This planktonic crustacean shows a seasonal variation in body shape that is commonly known as cyclomorphosis. Here I show that both predator-released chemicals and water-soluble “alarm” signals from …
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Factors Promoting Variation in Feeding Morphology of Larval Southern Toads (Bufo Terrestris)
Larval anurans exhibit morphological plasticity in response to environmental conditions. However, the effect of the environment on morphological traits associated with feeding has been understudied. The purpose of this study was to: 1) determine if diet composition and feeding behavior affect …
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Transgenic Tools in Ants and the Representation of Alarm Pheromones in the Ant Antennial Lobe
… These features, especially their extreme morphological plasticity, collective behavior, and complex chemical communication, together with their small sizes and relatively simple brains, make ants intriguing model systems for many topics in neurobiology. While many ant species possess …
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Crimpy Sorts a BMP into the Regulated Secretory Pathway for Activity-Dependent Release in Drosophila Motorneurons
… the signaling pathways that underlie such plasticity has been a major goal of modern neuroscience. BMP signaling critically regulates both morphological plasticity and neurotransmission in motorneurons at the Drosophila neuromuscular junction (NMJ). However the mechanisms that establish BMP …
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Level of UV-B Radiation Influences the Effects of Glyphosate-Based Herbicide on Fitness of the Spotted Salamander
… mortality, immune function, body condition, and morphological plasticity of larvae of the spotted salamander (Ambystoma maculatum) under conditions that reflect open and closed canopy light regimes. Larval salamander responses to glyphosate-based herbicide varied depending on UV-B conditions. In …
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The taxonomic and systematic relationships of several salt marsh Fucus taxa (Heterokontophyta, Phaeophyceae) within the Gulf of Maine and Ireland examined using microsatellite markers
… an introduction to the genus Fucus and discusses morphological plasticity, systematic difficulties, and studies of hybridization between different Fucus species.</p><p>Chapter II describes my development of microsatellite markers for Fucus. Four polymorphic microsatellite loci were used to …
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Investigating Bacterial Filamentation as a Survival Strategy for Infection
… cues for survival; a phenomenon called morphological plasticity. Our understanding of this plasticity is based mainly on stress-free growth conditions in the laboratory, making it difficult to determine its role in bacterial responses to the pressures of ‘real-world’ environments. One …
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Ecology and taxonomy of free-living marine nematodes from Cienfuegos Bay, Caribbean Sea
… a problematic taxon. Its species show high morphological plasticity, possess few diagnostic characters and identification keys are lacking. A revision of the genus was carried out based on morphological and morphometric data from the literature and from observations of specimens collected in …
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Nutrient Foraging in Ten Southeast Coastal Plain Plant Species
… are native to the South Carolina coastal plain. Morphological responses of the root system (scale, precision and discrimination) and overall plant response (sensitivity) to increasing nutrient heterogeneity were tested. Ten individuals of each species were placed into four treatments which had …
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The Role of Rac1 in Synaptic Plasticity, Learning and Memory
… remodeling, referred to as synaptic plasticity. Changes in the morphology of synapses are necessary for learning and memory storage, and require the rearrangement of the actin cytoskeleton at dendrites and actin rich dendritic spines which are the loci excitatory of synaptic …
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Molecular systematics of the genus Hypnea (Rhodophyta) in South Africa, with the description of a new genus, Tenebris (Cystocloniaceae, Rhodophyta)
… is shrouded in taxonomic confusion due to morphological plasticity of species and general lack of clear morphological characters. Of 113 species described worldwide only half of that number is accepted taxonomically. Of the 11-recorded species in South Africa there are currently 8 …