Structure of Carboxyl Groups in Humic Acids

How many carboxyl groups does an average molecule of humic - like substances contain ?

the role of thematic structure in comprehending spoken language

in fact this study is concerned with the relationship between the variation in thematice structure and the comprehension of spoken language. so the study focused on the following questions: 1. is there any relationship between thematic structure and the comprehension of spoken language? 2. which of the themes would have greated thematic force and be easier for the subjects to comprehend? accord...

Carboxyl Groups in Carbohydrate-concanavalin a Interaction

I. The role of carboxyl groups in the binding of specific carbohydrates to concanavalin A, the phytohemagglutinin of the jack bean, has been studied using two techniques: (I) H + titration in the presence and absence of methyl a-D-mannopyranoside, a specifically bound carbohydrate ligand and (2) chemical modification of the protein carboxyl groups employing glycine methyl ester and a water-solu...

Enzymatic carboxyl activation of amino acids.

Previous work in this laboratory (l-3) had revealed that the incorporation of C14-labeled amino acids into the protein of rat liver microsome fraction was dependent upon ATP’ and enzymatic components of the soluble protein fraction. Part of this enzymatic requirement was accounted for by enzymes which would generate ATP from a precursor such as phosphocreatine, phosphopyruvate, or phosphoglycer...

Ultraweak chemiluminescence from γ-irradiated humic acids

Humic substances, i.e. dark paramagnetic polymeric anionic polyelectrolytes, belong to the most widespread macromolecular substances of biogenic origin in soil and aquatic environments. The exact structure of humic substances is unknown because of their complexity resulting from unrecurring precursors, from their composition and their process of synthesis. Degradation processes of these substan...