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 10 of 10 for “"nerve impulses"”.
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Variability in the Firing of Nerve Impulses in Eccentric Cells of the Limulus Eye
… of variability in the discharge of impulses by neurons. The neuron in which variability was studied is the eccentric cell in the compound eye of the horseshoe crab, Limulus polyphemus. In Part I a theory is presented which accounts for the variability in the response of an eccentric …
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The effects of anticholinergic drugs on sea anemones
The first proof of the chemical mediation of nerve impulses by the peripheral release of specific chemicals was made by Loewi (1921). He demonstrated that during stimulation of the vagus nerve leading to an excised frog’s heart (Figure 1) a chemical mediator that he called Vagus-substance was …
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Identifying modifier genes in SMA model mice
… Muscular Atrophy (SMA) involves the loss of nerve cells called motor neurons in the spinal cord and is classified as a motor neuron disease, it affects 1 in 5000-10000 newborns, one of the leading genetic causes of infant death in USA. Mutations in the SMN1, UBA1, DYNC1H1 and VAPB genes cause …
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Biosynthesis and Signaling of Glucocorticoids and Progestins and Their Effects on Myelin Synthesis in Schwann Cell/neuronal Co-Cultures
… system that facilitates the transmission of nerve impulses in a fast and efficient manner. Steroids hormones can be synthesized de novo in the nervous system. The major objective of this research was to identify the steroid signal transduction pathways between neurons and Schwann cells that …
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Effects of Electromagnetic Fields on the Visually Evoked Response in the Visual Cortex
… of the visual cortex. From the fact that nerve impulses are propagated by the motions of electrically charged ions, the question arose whether the presence of an external electromagnetic field might affect either the propagation of nerve impulses traveling through the optical nerve pathway …
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The Structural and Functional Analysis of a Voltage-Dependent Potassium Channel
… voltage, a function that lies at the heart of nerve impulse generation and propagation. These channels contain transmembrane voltage-sensing domains that contain highly conserved cationic amino acids known as "gating charges." The gating charge residues move under the influence of the …
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Visualization of Local Anesthetic in the Pterygomandibular Space (PMS): Educational Module for Inferior Alveolar Nerve Blocks (IANBs)
… of neurons, thus blocking the transmission of nerve impulses to the brain and ultimately the perception of pain. Inferior alveolar nerve (IAN) blocks have the highest incidence of failure of any block injections, ranging from 15-20% (AlHindi, Rahsed, and AlOtaibi, 2016, p. 85). Factors, such as …
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Effects of high hydrostatic pressure on neuromuscular transmission in shallow-living and deep-living crustaceans
… decreased with increasing frequency of nerve stimulation; i. e., there was a pressure-induced increase in facilitation. Also a pressure-induced increase in the duration of the falling phase of the e.j.p. was observed which served to increase the level of depolarization resulting from …
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The Unconditioned Orogastric Secretory Reflex
… in the given reflex and the frequency of the nerve impulses conveyed to the nerve centers from the receptor apparatus. The numerous forms of interaction between various reflexes to be observed in spinal animals, their reciprocal intensification and inhibition, are regarded by the modern reflex …
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MR Susceptibility Mapping: Improved Quantification and Applications in Developmental Brain Imaging
… the axons, and is crucial in the transmission of nerve impulses. Human cognition, sensation and motor functions all rely on the efficient transmission of neural signals, where compromised myelin integrity may lead to severe neurological and physical disorders. Myelin abnormality can be a hallmark …