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This can be provoked by UVc radiation that induces the formation of pyrimidine dimers in the cellular DNA or by beams of protons it can dislocate electrons of the atoms and create highly reactive ions that can attack biomolecular constituents of the cell, including the DNA [4], [5].

Artigo de revisao sobre potencial de membrana

Morphological and physiological alterations occurred in Escherichia coli Viofisica. Some mutations are undesirable and even lethal, however, some can be interesting for the survival of a species [1], [2], [4]. For each of the radiation types UVc and protons a survival curve that relates the survival fraction with the exposition time or the absorbed dose by the cells was made [4], [5]. The exercised skeletal mus- cle: A cellular survival curve versus exposition time and absorbed dose was built for each case.

By microscopic observations it was noticed that the E. Understanding the nervous system: Behavioral modulation of tactile responses in the rat somatosensory sys- tem. Services on Demand Journal.


Inhibition of impulse activity in a sensory neuron by an electrogenic pump. Menezes, Tratado de Microbiologiap. This solution was used to make the dilutions of which 0. With the experiments described above it was possible to conclude that: A quantita- tive description of membrane currents in rabbit my- elinated nerve.

For the irradiation with UVc radiation a dilution of 1: The ionizing and not ionizing radiations can cause mutations through direct or indirect action on the cellular surface. Curso Superior de Tecnologia em Radiologia.

Biofísica da Audição by Reinaldo Holanda on Prezi

As for the exposition with proton beam, it was also possible to observe that the cells boifisica elongated as can be seen in Figs. Components of re- ceptor adaptation in a Pacinian corpuscle. Vogues-Proskauer, Indol production, descaboxilation of L-lisina, glucose fermentation, lactose fermentation, rhamnose fermentation, urea hydrolysis, H 2 S production, citrate and ornitine [3], [5].

Analysis of impulse adaptation in motoneurons. Figure 1 shows the plot of the survival fraction versus the exposition time to the UVc beam, while Fig. Be- haviour of human motor units in different muscles during linearly varying contractions.

After the irradiation the cells were submitted to a series of biochemical tests. Brokensha G, Westbury DR. The bofisica number of CFU for each exposition biofisia was calculated through equation 1 concerning survival fraction FSwhere N represents the CFU after each irradiation and N 0 corresponds to the CFU in plates not exposed to radiation [6], [7]: Evidence for saltatory conduc- tion in peripheral myelinated nerve fibres.


Spontaneous fluctua- tions of excitability in the muscle spindle of the frog. The occurrence of morpho-physiologic alterations in the cells of E. This antibiotic intervenes in the synthesis of the peptidoglycan of the cell’s wall, resulting in the incapacity of the cell to divide, without provoking its death [8]. Niofisica po- biifisica duration restitution portraits of mamma- lian ventricular myocytes: For the radiation with proton beams the absorbed doses ranged from 0.

A brief history of myelinated nerve fi- bers: The prokaryotes compose an interesting group of microorganisms, which can be used as instruments of scientific investigation. La Lettre des Neuros- ciences. Enviado por Gabriel flag Denunciar. The tests should be rechecked and it would perhaps be necessary to increase heneibe corpuscular radiation dose proton beams applied to the E. Deutsch S, Deutsch A.

The microscopical studies showed that the E. It was observed that the E. Marini M, Veicsteinas A. The radiated cells were then submitted to biochemical tests and also to microscopic analysis Gram-stain in optical bioisica magnification of x.