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 20 of 1992 for “"Plasticity"”.
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Plasticity of Identity
M.Arch. + M.F.A.
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Stress and Hippocampal Plasticity
… system experiences a certain degree of plasticity in response to stress. This dissertation examines the effects of chronic restraint stress on several parameters of hippocampal plasticity, including dentate gyrus neurogenesis, polysialic acid neural cell adhesion molecule (PSA-NCAM) …
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The plasticity of diamond
… attention has been given to the role of microplasticity and the nature of crack formation in the deformed zone formed beneath the indenter. It is then shown that a similar approach can be applied to the case where a cone, made from a softer material, replaces the conventional rigid indenter. …
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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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Rate independent crystal plasticity
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Plasticity of magnesium crystals.
Massachusetts Institute of Technology. Dept. of Metallurgy. Thesis. 1966. Ph.D.
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Immunological investigations into synaptic plasticity
… technology was applied to the study of synaptic plasticity resulting from passive avoidance training in the chick and long-term potentiation in the rat. These studies fell into three categories: 1) the disruption of memory for a one-trial passive avoidance task by intracranial injection of an …
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Photoperiod, Brain Plasticity, and Behavior
… in the hippocampus, the form of neuronal plasticity that is the putative mechanism of how memories are stored in the brain. In Chapters 3 and 4 I explore how photoperiod-mediated changes in hormones alter hippocampal function. Given that mammals use pineal melatonin rhythms to monitor day …
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Cytoskeletal Networks Driving Presynaptic Plasticity
… revealed that this process, known as synaptic plasticity, is tightly controlled by signaling cascades that ultimately expand or contract actin networks within postsynaptic sites. In this dissertation, I advance the field of synaptic plasticity by focusing on presynaptic terminals, which are …
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Plasticity and non-simple materials
"The connection between non-simple materials and plasticity is explored. The thermodynamic relations of conventional rate-independent plasticity and various classes of second-deformation-gradient plasticity are derived within the context of a theory with internal variables using the …
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Plasticity of γ-TiAl alloys
… achieve an understanding of the development of plasticity and flaw formation during cyclic loading. The general plasticity of a γ-TiAl alloy, Ti-45Al-2Nb-2Mn(at.%)-0.8vol.%TiB2, in compression was investigated by mapping the development of localised strain at the specimen surface. Methods were …
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Molecular mechanisms of synaptic plasticity
Synaptic plasticity serves as a central molecular mechanism underlying learning and memory formation in the brain. An increase in intracellular calcium concentrations triggered by neuronal activity induces synaptic plasticity, and calmodulin is a key protein that detects the elevated calcium levels …
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Plasticity of anisotropic porous metals.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1970.
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Transformation induced plasticity in ceramics
Transformation induced plasticity was investigated in a model ceramic. The effect upon toughness of the martensitic transformation from the cubic (paraelectric) to the tetragonal ( ferroelectric) phase in BaTiO3 was determined. The K1C fracture toughness, as measured by the hardness indentation …
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Induction and Maintenance of Synaptic Plasticity
… system can qualitatively reproduce plasticity results in response to spike-timing dependent plasticity (STDP) and presynaptic stimulation protocols. A reduced model based on the CaMKII system is used to elucidate which parameters control the synaptic plasticity outcomes in response …
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PLASTICITY IN PROTEIN SEQUENCE-FUNCTION RELATIONSHIPS
… relationship and provide insight into how this plasticity functions in the mechanism and evolution of allostery in BirA. Our deepened understanding of allostery in BirA and in general may facilitate the development of synthetic allosteric proteins in the future.
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Studies of plasticity after neuronal injury
… may benefit from strategies to enhance CNS plasticity. This Thesis makes use of an experimental strategy to promote plastic changes, that is, the enzyme chondroitinase ABC (ChABC) which degrades chondroitin sulphate proteoglycans - a major class of inhibitory extracellular matrix molecules. …
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Stochastic Mean-Field Polycrystal Plasticity Methods
Finally, we incorporate the STM in a finite element simulation of the Taylor impact of two tantalum specimens. Our simulation predictions mimic the texture and deformation data measured from a powder metallurgy specimen. However, round-corner square rolled (RCSR) specimen simulations over-predict …
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