Read e-book online The Enzymology of the Cell Surface Tension at the Cell PDF


By Aser Rothstein, Edmund N. Harvey

ISBN-10: 3211803459

ISBN-13: 9783211803455

ISBN-10: 3709154499

ISBN-13: 9783709154496

obvious houses, its constitution, composition, electric houses, me­ chanical homes, and such a lot really, its permeability homes. None of those homes are patently linked to floor enzymes. What are the capabilities of the cellphone floor which may require the presence of enzymes? From a simply hypothetical perspective, the mobile actions within which mobilephone floor enzymes are possibly useful may be divided into different types; first, these actions with regards to the construction and upkeep of the mobile floor constitution itself, and moment, these actions that are focused on interactions among the mobile and its surroundings. in the course of development of a phone, because it enlarges, new structural ma­ terial has to be synthesized and assembled within the phone membrane. even though it is a possibility that new structural fabric is synthesized within the inside of the cellphone, it's tricky to imagine its whole synthesis and ultimate meeting within the outer edge of the cellphone, with out the help of enzymes on the website. in relation to non-growing cells, even if no internet synthesis of latest structural fabric is critical, the turnover of some of the elements through a continuing degradation and resynthesis has to be regarded as a pos­ sibility.

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Additional info for The Enzymology of the Cell Surface Tension at the Cell Surface

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Ml. (ROTIISTEI:'>' and LARRABEE 1948; courtesy Organie r Total I mM/l. I mM/I. 5 ! 4 J. celIul. a. ) tration of orthophosphate within the cytoplasm is 1 to 2 X 10-2 M or 100 times as high, it is evident that the uranium must be located on the outside of the cell where it is influenced by the phosphate of the medium rather than by the phosphate of the cell. The chemical nature of the cell surface loci with which uranium combines have been investigated in some detail (ROTHSTEIN. FRENKEL, and LARRABEE 1948).

The evidence for surface action of uranyl ion is of several kinds (ROTHSTEIN and LARRABEE 1948). J • 8 0 ~ Ii: • • 6 • • :;) IL. 0 4 1&1 ~ ~ Q. 2 :;) 0 2 0 FINAL U- CONCENTRATION 3 IN MEDIUM IN MOLS I LITER 4 x 105 Fig. 8. The relationship between the tlnal concentration of U in the medium and the U-uptake per cell after one hour. /m\. (RO'l'HSTEIN and LARRAnE~: 1948; courtesy J. cellu\. a. ) a reversible complex. The equilibrium between the cell and the uranium in solution is achieved at a rapid rate, in fact, so rapid that unreasonable assumptions concerning the permeability of the membrane to uranyl iou would have to be made if penetration into the interior of the cell were required for its inhibitory activity.

On the basis of a carrier memanism it would have to be postulated that a specific carrier for galactose is produced during adaption in addition to the new enzyme, galactokinase, whim is known to appear. Furthermore, two kinds of glucose carrier would have to be available, one of whim is operative only under aerobic conditions. The hypothesis that surface enzyme reactions are necessary for sugar uptake is mum more attractive. It is compatible with all of the data, the 42 II, E, 4: A. ROTHSTEIN, The Enzymology of the Cell Surface sugar specificity, the requirement for polyphosphate, the effects of K+, H+, Ca++, Mg++ and U0 2 ++, the aerobic versus anaerobic effects, kinetics, etc.

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The Enzymology of the Cell Surface Tension at the Cell Surface by Aser Rothstein, Edmund N. Harvey

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