scholarly journals Soil polysaccharides synthesized by microorganisms in soil

1971 ◽  
Author(s):  
◽  
De-Shin Wang
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
High Molecular Weight ◽  
Amino Sugars ◽  
Uronic Acids ◽  
Carbohydrate Fraction

"The carbohydrate fraction of soil organic matter consists mainly of a mixture or heteropolysaccharides of high molecular weight. The major monosaccharide components are several sugars, uronic acids, amino sugars, and amino acids... "-Introduction

scholarly journals Characterization of Soil Organic Matter Individual Fractions (Fulvic Acids, Humic Acids, and Humins) by Spectroscopic and Electrochemical Techniques in Agricultural Soils

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1067
Author(s):  
Aleksandra Ukalska-Jaruga ◽  
Romualda Bejger ◽  
Guillaume Debaene ◽  
Bożena Smreczak
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Humic Acids ◽  
Agricultural Soils ◽  
Fulvic Acids ◽  
Sorption Properties ◽  
Aliphatic Chains

The objective of this paper was to investigate the molecular characterization of soil organic matter fractions (humic substances (HS): fulvic acids-FAs, humic acids-HAs, and humins-HNs), which are the most reactive soil components. A wide spectrum of spectroscopic (UV–VIS and VIS–nearIR), as well as electrochemical (zeta potential, particle size diameter, and polydispersity index), methods were applied to find the relevant differences in the behavior, formation, composition, and sorption properties of HS fractions derived from various soils. Soil material (n = 30) used for the study were sampled from the surface layer (0–30 cm) of agricultural soils. FAs and HAs were isolated by sequential extraction in alkaline and acidic solutions, according to the International Humic Substances Society method, while HNs was determined in the soil residue (after FAs and HAs extraction) by mineral fraction digestion using a 0.1M HCL/0.3M HF mixture and DMSO. Our study showed that significant differences in the molecular structures of FAs, Has, and HNs occurred. Optical analysis confirmed the lower molecular weight of FAs with high amount of lignin-like compounds and the higher weighted aliphatic–aromatic structure of HAs. The HNs were characterized by a very pronounced and strong condensed structure associated with the highest molecular weight. HAs and HNs molecules exhibited an abundance of acidic, phenolic, and amine functional groups at the aromatic ring and aliphatic chains, while FAs mainly showed the presence of methyl, methylene, ethenyl, and carboxyl reactive groups. HS was characterized by high polydispersity related with their structure. FAs were characterized by ellipsoidal shape as being associated to the long aliphatic chains, while HAs and HNs revealed a smaller particle diameter and a more spherical shape caused by the higher intermolecular forcing between the particles. The observed trends directly indicate that individual HS fractions differ in behavior, formation, composition, and sorption properties, which reflects their binding potential to other molecules depending on soil properties resulting from their type. The determined properties of individual HS fractions are presented as averaged characteristics over the examined soils with different physico-chemical properties.

Amino acids and amino sugars as indicators of the source and degradation state of sedimentary organic matter

2021 ◽  
Vol 230 ◽  
pp. 103931
Author(s):  
Jin-E Wei ◽  
Yan Chen ◽  
Jian Wang ◽  
Shi-Bo Yan ◽  
Hong-Hai Zhang ◽  
...  
Keyword(s):  
Amino Acids ◽  
Organic Matter ◽  
Sedimentary Organic Matter ◽  
Amino Sugars ◽  
Degradation State

Composition of High-Molecular-Weight Heteroatomic Components of Oil Shale Organic Matter

2020 ◽  
Vol 60 (9) ◽  
pp. 991-997
Author(s):  
E. Yu. Kovalenko ◽  
A. V. Petrov ◽  
I. S. Korol’ ◽  
T. A. Sagachenko ◽  
R. S. Min ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
High Molecular Weight ◽  
Oil Shale

Direct chromatographic enantioresolution of fully constrained β-amino acids: exploring the use of high-molecular weight chiral selectors

Amino Acids ◽  
2014 ◽  
Vol 46 (5) ◽  
pp. 1235-1242 ◽  
Author(s):  
Roccaldo Sardella ◽  
Federica Ianni ◽  
Antonella Lisanti ◽  
Stefania Scorzoni ◽  
Francesca Marini ◽  
...  
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Chiral Selectors

High molecular weight organic matter in martian meteorites

2002 ◽  
Vol 50 (7-8) ◽  
pp. 711-716 ◽  
Author(s):  
M.A. Sephton ◽  
I.P. Wright ◽  
I. Gilmour ◽  
J.W. de Leeuw ◽  
M.M. Grady ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
High Molecular Weight ◽  
Martian Meteorites

scholarly journals High molecular weight dissolved organic matter enrichment selects for methylotrophs in dilution to extinction cultures

2015 ◽  
Vol 9 (12) ◽  
pp. 2725-2739 ◽  
Author(s):  
Oscar A Sosa ◽  
Scott M Gifford ◽  
Daniel J Repeta ◽  
Edward F DeLong
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
High Molecular Weight
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