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The optimum temperature for Post Date: Wed, 30 Jul 2008 17:18:44 +0000
In this respect he is following the usage of earlier investigators, and even of Wehmer himself, who found saccharose as suitable as glucose for the production of citric acid ; this incidentally confirms the view already ex- pressed in this chapter that the dehydrogenation of the hexose molecule by acetic acid bacteria and by the fungi discussed in these pages proceeds via the enolic form of the carbohydrate. Citric acid production has been shown by Butkewitsch and by Bernhauer to be favoured by the presence of an abundance of nitrogen in the food solution. The optimum temperature for the conversion would appear (Bernhauer ) to depend to some extent on the prevailing nitrogen con- centration, being most favourable in the presence of abundant nitrogen, at lower nitrogen concentrations.

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Perms observation on the formation Post Date: Wed, 30 Jul 2008 17:06:25 +0000
A restriction of the oxygen supply available in the culture medium favours citric acid production (Buchner and Wiisten- A PATKLY clear conception of this mode of hexose dehydro- genation has been gained in recent years by the study of certain obligatory aerobic bacilli. Subsequent investigations by Desmots on the behaviour of Ba mesentericus vulgatus, Ba mesentricus niger, and Ba mesentricus ruber ; by Fernbaoh on Ba tenuis (Tyro- thrix tenuis), and by Lemoigne on certain types claimed by him to be Ba subtdia and Ba mesentricus , showed that the substance characterized by as glyceraldehyde was this product Desmots found acetic and valeric acids as well as traces of ethyl alcohol. Perms observation on the formation of formaldehyde was confirmed by Fernbaoh in the case of Ba tenuis.

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In their study on facultative Post Date: Wed, 30 Jul 2008 16:55:23 +0000
Fernbach CH3 was detected by Lemoigne as a decomposition product of glucose by the strains described by hi as Ba subtilis and Ba mesentericus strains which produced considerable The absence of lactic acid as a product of decomposition of glucose in these cases is noteworthy. That it is not likely to have been overlooked is supported both by theoretical consideration and by experimental evidence. In their study on facultative anaerobiosis Quastel and his collaborators found that only those organisms which were capable of activating nitrates to function as hydrogen acceptors could be expected to utilize lactic acid for growth.

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It had been demonstrated previously Post Date: Wed, 30 Jul 2008 16:45:09 +0000
The aerobic bacilli do not belong to the nitrate reducing types. This was shown by Quastel in the case of Ba subtilis. It had been demonstrated previously by Lemoigne 8 that the growth of his strain of Ba subtilis, which is claimed to produce carbon dioxide, was extremely slow in a medium containing calcium lactate as sole source of carbon.

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It is probable there- fore Post Date: Wed, 30 Jul 2008 16:30:03 +0000
The various observations referred to above indicate that a direct dehydrogenation of glucose to gluconic acid does not occur. The first fermentation product is invariably a sub- stance with less than six carbon atoms. It is probable there- fore that the first stage in the action of the aerobic bacilli on glucose is the formation of hexose phosphoric esters.

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Dehydrogenation of methylglyoxal would result Post Date: Wed, 30 Jul 2008 16:10:43 +0000
A relationship to the group of the acetic acid bacteria is discernible nevertheless in the property of the aerobic bacilli of dehydrogenating glycerine to dihydroxyacetone, a reaction which, it may be recalled, was shown by Bertrand 9 to occur when Bact. xylinum acted on glycerine. Dehydrogenation of methylglyoxal would result in the formation of pyruvio acid, the presence of which was reported by Aubel as an intermediate.

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There is every reason Post Date: Wed, 30 Jul 2008 15:58:05 +0000
The functions of pyruvic acid may be assumed with Cambier and Aubel and with Quas- tel to be connected, partly at least, with the synthetic processes of the cell plasma. Through intramolecular hydro- gen transfer methylglyoxal might give rise to acetaldehyde and formic acid (Kluyver and Donker ), of which the latter Acetaldehyde has not to the writers knowledge been discovered as an intermediate fermentation product of the aerobic bacilli. There is every reason to assume, however, that acetaldehyde is produced, since ethyl alcohol, acetyl- methyloarbinol, 2:3 butyleneglycol, and hydroxybutyric acid have been found.

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The acetylmethylcarbinol is regarded Post Date: Wed, 30 Jul 2008 15:43:02 +0000
It is true that Lemoigne 4 suggests a different origin for acetylmethylcarbinol and butyleneglycol. He states that the glucose molecule becomes dislocated through the action of the bacteria and that 2 :3 butyleneglycol is thereby produced with evolution of carbon dioxide. The acetylmethylcarbinol is regarded by him as formed from 2 :3 butyleneglycol by subsequent oxidation.

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The formation of the -hydroxybutyric Post Date: Wed, 30 Jul 2008 15:23:07 +0000
But this is hardly a correct interpretation. The work of Neuberg and Rein- furth, 13 and of Kluyver, Donker, and Vissert Hooft 14 on the formation of acetylmethyloarbinol by yeast, shows that acetaldehyde is the mother substance of this compound and that it is produced from acetaldehyde in the presence of hydrogen acceptors, notably of oxygen. The formation of the -hydroxybutyric acid, detected by Lemoigne, might result from the coupling of one molecule of acetaldehyde with one molecule of acetic acid, acetaldehyde acetio acid hydroxybutyrio acid.

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Reviewing the above observations, it Post Date: Wed, 30 Jul 2008 15:03:28 +0000
The origin of the valeric acid observed by Per has not been traced by subsequent investigators; in fact it seems problematic whether this substance was really derived from carbohydrates. The presence of formic acid as a fermentation product of the aerobic bacteria has not been reported though formalde- hyde, as already mentioned, was found by PerS and by Fernbach.Reviewing the above observations, it is to be assumed that the hexose molecule in the mode of fermentation dealt with in this chapter is converted first into hexosephosphoric esters.

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