This what the preceding phenomena teach shall have occasion compare them later with others which relate the vital action exercised We may here permitted make a digression. In his work fermentations, which Schützenberger has recently published, the author criticises the deductions that have dra from the preceding experiments, and combats the explanation which have given the phenomena fermentation. It an easy matter show the weak point Schützenberger's reasoning. We determined the power the ferment the relation the weight sugar decomposed the weight the yeast produced.

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Schützenberger asserts that in doing this lay down a doubtful hypothesis, and thinks that this power, which terms fermentative energy, may estimated more correctly the quantity sugar decomposed buy essay papers online the unit-weight yeast in unit-time moreover, since our experiments show that yeast very vigorous when has a sufficient supply oxygen, and that, in such a case, can decompose much sugar in a little time, Schützenberger concludes that must then have great power as a ferment, even greater than when performs its functions without the aid air, since under this condition decomposes sugar very slowly.

In short, disposed draw from our observations the very opposite conclusion M.

Schützenberger has failed notice that the power a ferment independent the time during which performs its functions. We placed a trace yeast in one litre saccharine wort propagated, and all the sugar was decomposed. Now, whether the chemical action involved in this decomposition sugar had required for its completion one day, or one month, or one year, such a factor was no more importance in this matter than the mechanicallabour required raise a ton materials from the ground the top a house would affected the fact that had taken twelve hours instead one.

The notion time has nothing with the definition work.

Schützenberger has not perceived that in introducing the consideration time into the definition the power a ferment, must cheapest essay writing services introduce at the same time, that the vital activity the cells which independent their character as a ferment. Apart from the consideration the relation existing between the weight fermentable substance decomposed and that ferment produced, there no occasion speak fermentations or ferments. The phenomena fermentation and ferments have been placed apart from others, precisely because, in certain chemical actions, that ratio has been out proportion but the time that these phenomena require for their accomplishment has nothing with either their existence proper, or with their power.

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The cells a ferment may, under some circumstances, require eight days for revival and propagation, whilst, under other conditions, only a few hours are necessary that, if introduce the notion time into our estimate their power decomposition, may led conclude that in the first case that power was entirely wanting, and that in the second case was considerable, although all the time are dealing with the same organism-the M.

Schützenberger astonished that fermentation can take place in the presence free oxygen, as suppose, the decomposition the sugar the consequence the nutrition the yeast, at the expense the combined oxygen, which yields itself the ferment.

At all events, argues, fermentation ought slower buy essays online safe in the presence free oxygen.

But why should slower? We have proved that in the presence oxygen the vital activity the cells increases, that, as far as rapidity action concerned, its power cannot diminished. It might, nevertheless, weakened as a ferment, and this precisely what happens. Free oxygen imparts the yeast a vital activity, but at the same time impairs its power as yeast-quâ yeast, inasmuch as under this condition approaches the state in which can carryon its vital processes after the manner an ordinary fungus the mode life, that in which the ratio between the weight sugar decomposed and the weight the new cells produced will the same as holds generally among organisms which are not ferments. In short, varying our form expression a little, may conclude with perfect truth, from the sum total observed facts, that the yeast which lives in the presence oxygen and can assimilate as much that gas as necessary its perfect nutrition, ceases absolutely a ferment at all. Nevertheless, yeast formed under these conditions and subsequently brought into the presence sugar, out the influence air, would decompose more in a given time than in any other its states. The reason that yeast which has formed in contact with air, having the maximum free oxygen that can assimilate fresher and possessed greater vital activity than that which has been formed without air or with an insufficiency air. Schützenberger would associate this activity with the notion thesis proposal writing time in estimating the power the ferment but forgets notice that yeast can only manifest this maximum energy under a radical change its life conditions having no more air at its disposal thesis printing and breathing no more free oxygen. In other words, when its respiratory power becomes null, its fermentative power at its greatest. Schützenberger asserts exactly the opposite ISI his work-Paris.

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