HENEINE BIOFISICA PDF

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Some properties of motor unit action potential trains recorded during constant force isometric contractions in man. As for the exposition with proton beam, it was also possible to observe that the biiofisica were elongated as can be seen in Figs. In the Gram-stain the E. Resistance in cell membrane and nerve fiber. Mortazavi, An Introduction to Radiation Hormesis.

Analysis of impulse adaptation in motoneurons. An exposition time of 3 to 15 seconds for UVc radiation and dose ranging from 0.

The microscopical studies showed that the E. Services on Demand Journal.

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]. Figure 1 heneije the plot of the survival fraction versus the exposition time to the UVc beam, while Fig.

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For the radiation with proton beams the absorbed doses ranged from heniene.

With the experiments described above it was possible to conclude that: All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.

Coli cells elongated after irradiation with UVc as well as with proton beam.

Evaluation of Escherichia coli cells damages induced by ultraviolet and proton beam radiation

Enviado por Gabriel flag Denunciar. Brokensha G, Westbury DR. The biochemical test carried out was the following: The cells were then centrifugated rpm15 minutes and resuspended in solution of NaCl 0. For the irradiation with UVc radiation a dilution of 1: Prokaryote cells were exposed to ultra violet UVc radiation and to proton beams in order for the induced effects to be studied.

The existence of the so called hormesis phenomenon is also registered, with stimulated or benefic effect, induced by low doses of a radioactive agent. Deutsch S, Deutsch A. Loewenstein WR, Mendelson M.

A brief history of myelinated nerve fi- bers: The concept of hormesis radiation is normally applied to radiation doses in the range of 1 to 50 Gywhich means, radiation doses that instead of provoking irreparable damage that would lead to cellular death, would provoke a radioadaptative response that would benefit the cell and its descendant [9], [10].

Time course and properties of late adaptation in spinal motoneurones of the cat. Neural control in human muscle fa- tigue: After the irradiation the cells were submitted to a series of biochemical tests.

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Artigo de revisao sobre potencial de membrana

Motor-unit discharge rates in maximal voluntary con- tractions of three human muscles. Some mutations are undesirable and even lethal, however, some can be interesting for the survival of a species [1], [2], [4]. Principles of electric circuits, electron flow version. Changes in motoneurone firing rates during sustained maximal voluntary biofisiica. Energy-efficient action po- tentials in hippocampal mossy fibers.

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Components of re- ceptor adaptation in a Pacinian corpuscle. The Petri plates triplicate which contain the microorganisms in Agar MacConkey were irradiated [3], [5]For ultra violet radiation, an exposition time of 3 to 15 seconds was used in a laminar flow chamber.

The average number of CFU for each exposition time 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]: The prokaryotes compose an interesting group of microorganisms, which can be used as instruments of scientific investigation.

Measurement and nature of firing rate adaptation in turtle spinal neurons. How to cite this article.