The relationship between malic acid production and carbon assimilation was examined in the submerged aquatic Crassulacean acid metabolism (CAM) plant, Isoetes howellii Engelmann. Under natural conditions free-CO(2) level in the water was highest at 0600 hours and (14)CO(2) assimilation rates in I. howellii were also highest at this time. After 0900 hours there was a similar pattern in (a) rate ...

We aimed to unravel the events which favor the seed-rhizobacterium Bacillus amyloliquefaciens strain ALB629 (hereafter ALB629) interaction and which may interfere with the rhizobacterium colonization and growth on the spermosphere of common bean. Seed exudates from common bean were tested in vitro for ALB629 biofilm formation and bacterial growth. Furthermore, the performance of ALB629 on plant...

This study was designed to characterize isolates of Leuconostoc species from Oregon wines. Gram-positive cocci were isolated, and their biochemical properties and abilities to decompose malic acid were determined. All of the isolates were heterofermentative, catalase negative, and facultatively anaerobic and occurred in pairs and chains. They produced acid from glucose, fructose, mannose, ribos...

A number of metabolic reactions have been shown to occur in microorganisms in recent years, which help to explain their ability to utilize 2-carbon compounds for growth. The central reaction for acetate-grown organisms appears to be the malic synthetase described by Wong and Ajl (1956, 1957) in which a 4-carbon compound, malic acid, is synthesized from acetyl coenzyme A (CoA) and glyoxylic acid...

Drábek O., Kipkoech Kiplagat I., Komárek M., Tejnecký V., Borůvka L. (2015): Study of interactions between relevant organic acids and aluminium in model solutions using HPLC and IC. Soil & Water Res., 10: 172–180. The interactions of different organic acids such as citric, malic, oxalic, and fulvic with aluminium were studied using ion-exchange chromatography (IC) and high performance liquid ch...

The rate of malic acid consumption in the Crassulacean acid metabolism (CAM) plant Kalanchoë daigremontiana Hamet et Perrier was found to be more rapid than the rate of photosynthetic oxygen evolution under all levels of irradiation by white light. This accounts for the accumulation of carbon dioxide in CAM tissues in the light.Action spectra of malate consumption and photosynthetic oxygen evol...

The competitive inhibition of malic dehydrogenase by /3-fluorooxaloacetate has been reported by Kun et al. (1). In addition to its inhibitory effect, /3-fluoro-oxaloacetate also oxidized reduced diphosphopyridine nucleotide enzymatically, but at a rate only 0.02% that of oxaloacetate. It was also shown (2) that fi-fluorooxaloacetate was a competitive inhibitor of glutamic-aspartic transaminase,...

The purpose of these experiments were to determine possible relationships between certain indices of lipid metabolism and specific gene expression in chickens fed graded levels of dietary crude protein. Male, broiler chickens growing from 7 to 28 days of age were fed diets containing 12 or 30% protein ad libitum. Both groups were then switched on day 28 to the diets containing the opposite leve...

Although biotin is required for the synthesis of the inducible malic enzyme in Lactobacillus arabinosus 17-5 (I), partially purified preparations of the enzyme do not contain biotin (a), and avidin does not affect the activity of the enzyme (3). The formation of another enzyme, ornithine transcarbamylase, in iStreptococcus Zactis 8039 is also diminished by a biotin deficiency (4), but purified ...