Frequency Amplitude Gradient
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Análise espectral de padrões-gradiente de séries temporais curtas / Gradient spectral analysis for short time series
With the modernization of data collecting technology, in the time series format, new methodological challenges, for analyzing and interpreting variability patterns, have been growing. In general, such challenges are due to several collecting data problems when they are under extreme environmental variations, data satellite transmission and other inherent ins
Publicado em: 2008
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2. Estudos analíticos dos grafoelementos do eletroencefalograma em sono: fusos do sono, ondas agudas do vértex e o gradiente de freqüência e amplitude, como indicadores de comprometimento neurológico na criança
Innumerable studies have focused been reported on the sleep spindles (SS), Sharp Vertex Waves (SVW) and REM, NREM Sleep as indicators interpreting EEG patterns in children. However, Frequency and Amplitud Gradient (FAG) is rarely cited sleep parameter in children,that occurs during NREM Sleep. It was first described by Slater and Torres, in 1979, but has not
Publicado em: 2006
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3. Caracterização e zoneamento ambiental da reserva particular do patrimônio natural Parque Ecológico João Medeiros (Fazenda Verde, Rondonópolis, MT).
This study was undertaken at the Lapa microbasin (Itirapina/ Ipeúna), located in the central Cuestas region of the State of São Paulo, Brazil, with the objective to characterize ichthyofauna composition and longitudinal distribution within the basin and to examine the diversity, richness and equability for each of the 12 sample stations. Sampling took plac
Publicado em: 2005
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4. Excitatory effects of Buthus C56 toxin on Drosophila larval neuromuscular junction
Buthus C56 toxin from venom of the Indian red scorpion Mesobuthus tamulus was studied for its effects on spontaneous miniature excitatory junctional potentials (MEJP) on Drosophila larval neuromuscular junctions. C56 toxin was isolated on CM-Cellulose with linear gradient of ammonium acetate buffer, pH 6.0. Toxin purity was determined on SDS slab gel electro
Journal of Venomous Animals and Toxins including Tropical Diseases. Publicado em: 2003
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5. Changes of frequency spectrum of the CSF pulse wave caused by supratentorial epidural brain compression.
The frequency spectrum of the CSF pulse wave and amplitude transfer function from arterial to CSF pressure were estimated in the lateral ventricle and cisterna magna during the course of supratentorial epidural compression of brain in anaesthetised ventilated cats. Ventricular fluid pressure, the amplitude of spectral components of the CSF pulse and the ampl
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6. Intramural mechanism of esophageal peristalsis: roles of cholinergic and noncholinergic nerves.
We examined the role of peripheral cholinergic and noncholinergic mechanisms in esophageal peristalsis. Intramural nerve elements in rings of circular muscle from six different levels of the opossum esophagus were stimulated transmurally so as to cause neurally mediated muscle contractions. Stimulus frequency was varied from 2 to 40 Hz. An increase in stimul
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7. Myogenic electrical control activity in longitudinal muscle of human and dog colon.
1. The myogenic electrical activities of longitudinal muscle cells of the dog and human colon were investigated using intracellular microelectrodes. 2. The resting membrane potentials of dog and human longitudinal muscle cells at the serosal side of the muscle layer were -49.4 +/- 0.9 and -44.8 +/- 1.3 mV respectively. 3. Spontaneous electrical activity cons
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8. Generation of slow-wave-type action potentials in canine colon smooth muscle involves a non-L-type Ca2+ conductance.
1. The hypothesis was addressed that a non-L-type calcium conductance is involved in the generation of the initial part of the slow-wave-type action potential in the canine colon. 2. In the absence of a sodium and chloride gradient (NaCl replaced by glucamine), and in the presence of nitrendipine (in 'glucamine-nitrendipine' Krebs solution), a major portion
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9. Visual stimuli induce waves of electrical activity in turtle cortex
The computations involved in the processing of a visual scene invariably involve the interactions among neurons throughout all of visual cortex. One hypothesis is that the timing of neuronal activity, as well as the amplitude of activity, provides a means to encode features of objects. The experimental data from studies on cat [Gray, C. M., Konig, P., Engel,
The National Academy of Sciences of the USA.
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10. Predictions of thermodynamic efficiency in a pumped biochemical reaction.
We propose and analyze a possible experimental system for the investigation of the thermodynamic efficiency of generating biochemical gradients. We investigate the efficiency of a model pump that uses 6-phosphofructokinase (EC 2.7.1.11, an enzyme that exhibits highly nonlinear kinetics), chromatophores from Rhodobacter sphaeroides, and light to generate a bi
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11. Calcium spikes and calcium plateaux evoked by differential polarization in dendrites of turtle motoneurones in vitro.
1. The ability of dendrites in turtle motoneurones to support calcium spikes and calcium plateaux was investigated using differential polarization by applied electric fields. 2. Electric fields were generated by passing current through transverse slices of the turtle spinal cord between two plate electrodes. The linear extracellular voltage gradient generate
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12. Electrical coupling of circular muscle to longitudinal muscle and interstitial cells of Cajal in canine colon.
1. Electrical communication between circular muscle, longitudinal muscle and interstitial cells of Cajal (ICC) was investigated; the hypothesis was tested that the resting membrane potential (RMP) gradient in the circular muscle of canine colon is caused by electrical coupling to neighbouring cells. 2. Isolated longitudinal muscle exhibited spike-like action