The carbohydrate moiety of secretory arabinogalactan protein in bean seedlings (Phaseolus vulgaris L. cv. Prélude) is attached to the peptide backbone through hydroxyproline, serine, and threonine. Hydroxyproline-linked side chains, consisting of arabinose, galactose, glucose, and rhamnose, comprise the major part of the sugar residues. These hydroxyproline glycosides differ from those in non-e...

The role of pentoses in intermediary metabolism has received much attention within the past few years. The phosphate esters of D-ribose, D-ribulose and D-xylulose have been identified as key intermediates in the pentose phosphate pathway of glucose metabolism in both plant and mammalian tissue (1). More recently, another alternate pathway of glucose dissimilation, the uronic acid pathway, has b...

In a study of the mechanism of action of notatin, the flavin adenine dinucleotide-dependent glucose aerodehydrogenase of molds, Bentley and Neuberger (2) in 1949 obtained evidence suggesting that the enzyme preparation also catalyzed the mutarotation of glucose. Keilin and Hartree (3, 4) demonstrated that some notatin samples contained a second enzyme, named mutarotase, which was the most activ...

In a study of the mechanism of action of notatin, the flavin adenine dinucleotide-dependent glucose aerodehydrogenase of molds, Bentley and Neuberger (2) in 1949 obtained evidence suggesting that the enzyme preparation also catalyzed the mutarotation of glucose. Keilin and Hartree (3, 4) demonstrated that some notatin samples contained a second enzyme, named mutarotase, which was the most activ...

The leaf-spot disease of sugar beet caused by Cercospora beticola is of considerable economic importance in these countries where the conditions of high light-intensity (Calpouzos & Stallknecht, 1967) and relative humidity (Pool Rr McKay, 1916) favour spore germination and the establishment of infection. High light-intensity greatly increases carbohydrate exudation from leaves (Tukey et al., 19...

Antioxidant and antimicrobial properties of chitosan-sugar complex from six types of sugar (glucose, fructose, lactose, arabinose, maltose, and galactose) were investigated. Antioxidant properties were measured by the DPPH test and a measurement of reducing power. These two methods showed the same profile of antioxidant activity. All chitosan-sugar complexes demonstrated better antioxidant acti...

The anaerobic fungus Neocallimastix sp. strain R1 was grown for up to 5 days on a medium containing autoclaved Italian ryegrass hay as the carbon source. Culture supernatants and digested cell walls were harvested at 12-h intervals. Supernatants were analyzed for the fermentation products formate and acetate, and residual cell walls were analyzed for dry-matter and neutral-sugar losses. Fungal ...

The ability of indole derivatives to facilitate RNA polymerase transcription of the L-arabinose operon in Escherichia coli was shown to require the catabolite activator protein (CAP) as well as the araC gene product. Adenosine 3',5'-monophosphate (cAMP) was not obligatory for araBAD transcription when the cells were grown in the presence of 1 mM indole-3-acetic acid or in the presence of indole...

The aim. aim of the study was to content polysaccharide fractions depending on dissolution, qualitative composition and quantitative sugars in corn silk, leaves roots.
 Materials methods. To different polysaccharides - water-soluble (WSPS), pectin substances (PS), hemicelluloses A (HC A) B (HM B) used a gravimetric method based extraction with suitable solvent followed by sedimentation wei...

BACKGROUND Potato pulp constitutes a complicated system of four types of polysaccharides: cellulose, hemicellulose, pectin and starch. Its composition makes it a potential and attractive raw material for the production of the second generation bioethanol. The aim of this research project was to assess the usefulness of commercial enzymatic preparations for the hydrolysis of potato pulp and to e...