By Helmut Metzner, Geoffrey H. Bourne
Paper he mentioned the consequences whim were acquired from his reports of the adrenal gland. the consequences he acquired are most likely top instructed in his personal phrases: -"To see even if the adrenal cortex comprises this type of decreasing agent the gland was once lower with a knife into halves-which have been immersed in a zero. four% AgN0 answer. In a couple of minutes the cortical half three was once obvious to darken throughout the deposition of decreased metal silver. In 1 / 4 of an hour the lower floor of the cortex grew to become thoroughly black whereas the medulla remained principally uncoloured. The black colouration ends in the direction of the medulla with a pointy margin, which corresponds to the anatomical margin among the medulla and cortex. just like the medulla, different organs, comparable to mind, liver and muscle stay virtually uncoloured. " while the gland was once immersed in a mix of potassium iodate and acetic acid-a reagent for adrenalin, the medulla turned violet in color and the cortex remained colourless. SZENT-GYORGYI for this reason got here to the realization that: -"The adrenal cortex consequently, comprises a few particular hugely decreasing agent which might be no arte truth, seeing that its motion is produced within the virtually clean fabric. " Methyl alcohol extracts of the cortex lowered impartial silver nitrate virtually at once and whilst the parts of the interrenal glands of Elasmobranm fishes have been handled with silver nitrate strategies they too went black-so that it seemed that this hugely decreasing issue was once a funda psychological constituent of adrenal tissue.
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Extra resources for Die Ascorbinsäure in der Pflanzenzelle. Vitamin C in the Animal Cell
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J. FRANCIS, 1952: Studies on the formation of vitamin C in slices of potato tissue. Canad. J. Bot. 30, 665. BABBAR, 1. , and B. AHMAD, 1949: Ascorbic acid. VI. Oxalic acid as an extractant of ascorbic acid from plant materials and its effect on the stabiIity of ascorbic acid. Ann. Biorhem. and exper. Med. (India) 9, 103. , und E. POMMER, 1938: über die Beeinflussung der AscorbinsäurebiIdung bei einigen Getreidepflanzen. Z. Bodenkde. u. Pflanzenern. 9/10, 724. BARAKAT, M. , N. BADRAN, and S. K. SHEHAB, 1952: Photoelectric colorimetric determination of ascorbic acid.
Es ist häufiger gezeigt worden, daß AS-Zufuhr die Assimilationsintensität der versChiedensten Pflanzen erhöht (vgl. z. B. BUKATSCH 1939 b). Lange blieb unklar, inwieweit man darin einen spezifischen AS-Effekt erblicken darf (EGLE 1950). Wenn siCh auCh bald zeigen ließ, daß kein einfaCher pH-Effekt vorliegt (LuGER 1954), so fehlten doCh VergleiChsuntersuChungen mit anderen Reduktonen, die ein ebenso niedriges Redoxpotential einregulieren können (vgl. SOMERS, KELLY und HAMNER 1948). Neuerdings hat sich nun aber zeigen lassen, daß die AS als Cofaktor an der photosynthetisChen Phosphorylierung beteiligt ist (ARNON 1956).
Abb. zw. aus der Galactose über die d-Galacturonsäure und das I-Galactono-y-Lacton (vgl. Abb. 25) nahe. Aus Pisurn H OH H / "'- ~--I 1 H-C-OHI ° ------1 1 HO-C-H 1 OH "'- C/ - - H-i-OHI -4H H-C-OH 1 H-C--- <[ I-i-H I H-C-OHI ° 1 / H-i--- 1 1 ' I I~C-H 1 IHO-C-H 1 1 I ° / --+2H / ° 0=,--1 ,--I HO-C-H 1 HO-C-H I °I HO-C -2H --~ H-6-_1 11 HO-C 1 1 d-Glucurono-y-Lacton I HO-C-H 1 CHsOH "'-H I ° H-6-1 ! HO-C-H IHO-1-H HO d-Glucose I OH-C-- --C --C=O CHzOH 0=,- CHzOH I-Gulono-y-Lacton I-Ascorbinsäure Abb.