Gasometric Determination of Carboxyl Groups in Amino Acids

Slyke, Donald D. Van; Dillon, Robert T.

doi:10.3181/00379727-34-8621p

Cited by 38 publications

(35 citation statements)

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“…Inasmuch as in preserved plasma, both free amino-acids and polypeptides are increased, the enzyme operating must contain both proteinase and peptidase activity. Therefore, it is not identical with crystalline trypsin of Northrup and Kunitz which does not contain any peptidase activity (15). In its activity at the pH of plasma, 7.4, it does resemble the enzyme of chloroform-treated plasma which has optimal activity at this pH (22 2.…”

mentioning

confidence: 94%

Preservation of Normal Human Plasma in the Liquid State. Iii. Studies on Chemical and Physico-Chemical Changes During the Second Year of Storage 12

Lozner¹,

Taylor²,

Lemish³

et al. 1944

J. Clin. Invest.

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confidence: 94%

Preservation of Normal Human Plasma in the Liquid State. Iii. Studies on Chemical and Physico-Chemical Changes During the Second Year of Storage 12

Lozner¹,

Taylor²,

Lemish³

et al. 1944

J. Clin. Invest.

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“…The cation exchange resin AG 50W-X8 (100-200 mesh) was purchased from Bio-Rad Laboratories in the ammonium form and was converted to the Li' form by washing with an excess of 4 M LiCl and distilled H20. Methional and selenomethional were prepared from D,L-methionine and D,L-selenomethionine, respectively, by a Strecker degradation with ninhydrin (19,21). Ferredoxin was prepared from spinach leaves by acetone fractionation and column chromatography on Whatman DE52 cellulose (18).…”

mentioning

confidence: 99%

Interactions of Methionine and Selenomethionine with Methionine Adenosyltransferase and Ethylene-generating Systems

Konze¹,

Kende²

1979

Plant Physiol.

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Since selenomethionine appears to be a better precursor of ethylene in senescing flower tissue of Ipomoe tricolor and in indole acetic acid-treated pea stem sections than is methionine (Konze JR, N Schilling, H Kende 1978 Plant Physiol 62: 397-401), we compared the effectiveness of selenomethionine and methioine to participate in reactions which may be connected to ethylne biosynthesis. Evidence is presented that selenomethionine is also a better substrate of methionine adenosyltransferase (ATP: methionine S-adenosyltransferase, EC 2.5.1.6) from L trolor, the V,"for selenomethionine being twice as high as that for methionine. The affinity of the enzyme is higher for methionine than for selnomthionine, however. Methionine added to flower tissue together with sekeomethionine inhibits the enhancement of ethylene synthesis by the seleno analog. Likewise, methioine reduces the high, selenomethionine-dependent reaction rates of methioine adenosyltransferase from L tricolor flower tissue. On the other hand, selenomethionine is less effective as an ethylene precursor than is methionine in model systems involving oxidation by free radicals. It was concluded that activation of methionine by methionine adenosyltransferase and formation of S-adenosylmethionine are more likely to be involved in ethylene biosynthesis than is oxidation ofmethionine by free radicals.In all plant tissues investigated thus far, methionine was found to be the precursor of ethylene (for reviews see refs. 13 and 22). Since methionine can be converted to ethylene in vitro via methional (14,20)

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“…Glycine and total a amino N were measured by techniques previously described (17,18). Each value is the average of duplicate determinations.…”

Section: Methodsmentioning

confidence: 99%

Studies on Amino Acid Metabolism. Ii. Blood Glycine and Total Amino Acids in Various Pathological Conditions, With Observations on the Effects of Intravenously Administered Glycine 1

Vries¹,

Alexander²,

Quamo³

1948

J. Clin. Invest.

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Gasometric Determination of Carboxyl Groups in Amino Acids

Cited by 38 publications

References 0 publications

Preservation of Normal Human Plasma in the Liquid State. Iii. Studies on Chemical and Physico-Chemical Changes During the Second Year of Storage 12

Preservation of Normal Human Plasma in the Liquid State. Iii. Studies on Chemical and Physico-Chemical Changes During the Second Year of Storage 12

Interactions of Methionine and Selenomethionine with Methionine Adenosyltransferase and Ethylene-generating Systems

Studies on Amino Acid Metabolism. Ii. Blood Glycine and Total Amino Acids in Various Pathological Conditions, With Observations on the Effects of Intravenously Administered Glycine 1

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