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Author: Aleksey Kuznetsov
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110618028
Category : Science
Languages : en
Pages : 123
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Book Description
Porphyrins, composed of four pyrrole subunits, are highly important compounds, which are ubiquitous in biological systems. This book reviews the factors that influence physical and chemical properties of tetrapyrrole species and explores the ways to tune geometric and electronic structures of porphyrins in order to modify their electronic, optical and magnetic characteristics.
Author: Aleksey Kuznetsov
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110618028
Category : Science
Languages : en
Pages : 123
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Book Description
Porphyrins, composed of four pyrrole subunits, are highly important compounds, which are ubiquitous in biological systems. This book reviews the factors that influence physical and chemical properties of tetrapyrrole species and explores the ways to tune geometric and electronic structures of porphyrins in order to modify their electronic, optical and magnetic characteristics.
Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 196
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Book Description
Author: Armin Börner
Publisher: Springer Nature
ISBN: 3662665212
Category : Science
Languages : en
Pages : 234
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Book Description
Living organisms are distinguished by their chemical basis. Thus, knowledge of the properties of the elements and the interactions of the resulting compounds is a prerequisite for understanding biology. Chemistry answers the questions of why, among the more than 100 elements of the periodic table (PSE), carbon and not silicon is the dominant element in biology and why precious metals, such as gold and silver, do not play a role. The PSE provides information about why phosphoric acid and not sulfuric acid acts as a bridge in polynucleic acids and why DNA had to evolve from RNA. At the same time, only chemistry makes clear why D-glucose is so central in building biopolymers such as cellulose and glycogen, and why the citrate cycle is logically self-contained and without alternative. Biochemistry is also a synthesis chemistry that differs from "man-made" synthesis chemistry "only" in terms of the framework conditions. Individuals are selected from the multitude of elements of the PSE and the almost infinite number of chemical compounds. The selection is based on the environmental conditions on Earth, such as moderate temperatures, preferably atmospheric pressure, solvent water and as primary reaction partner oxygen. The hypothesis is developed that the guiding principle of modern biology, the theory of evolution, has its roots in the underlying chemistry. This turns Darwinism from its biological head to its chemical feet. For example, the effect of phenols as radical scavengers is a priori chemical, before biological phenomena could evolve from it as differences in distinction in colored flowering plants. The book develops a completely new, chemistry-centered view of "animate nature" and challenges a changed, biologically oriented didactics of chemistry in schools and universities.
Author: Lech Wojciech Szajdak
Publisher: Springer
ISBN: 3319431072
Category : Technology & Engineering
Languages : en
Pages : 314
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Book Description
This volume looks at the impact that different cropping systems and tillage have on soil’s biologically active substances. It considers how phytotoxins accumulate and can inhibit the development of cultivated plants. Coverage explores the continuous cropping of rye, crop rotation, no tillage, and conventional tillage. It offers a comprehensive, comparative approach to allelopathic plant-soil interactions. The authors focus on free and bounded biologically active substances such as amino acids, auxins, humic and fulvic acids, transient radicals, and enzymes in light sand soils fertilized with different mineral and organic fertilizers. The chapters address fundamental questions relevant to the environmental challenges we face today and will deal with in the future. The results involve asking basic questions motivated by soil's chemical and biochemical processes. The answers will lead to the improvement of the quality of soil’s organic matter, which, in turn, can lead to increased crop yields. Readers will come to understand the relationship between ecological processes and environmental change on individual levels of biocomplexity as well as on systems in their entirety. The title is ideal for students and teachers for laboratory practical classes. Soil scientists, biochemists, chemists, plant ecophysiologists, “Natural Products” organic chemists, and other environmental scientists and specialists will also find it useful.
Author: Donald John Baumgartner
Publisher: Krieger Publishing Company
ISBN:
Category : Science
Languages : en
Pages : 272
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Book Description
Author: Gennady Zaikov
Publisher: CRC Press
ISBN: 9067644196
Category : Technology & Engineering
Languages : en
Pages : 375
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Book Description
This monograph summarizes scientific achievements in the field of polysaccharide chemistry performed in the last decade. For the first time, the particular features of polysaccharide structure, physical-chemical properties and biochemical transformations in their interrelations are considered as well as the questions of polysaccharide modification along the whole hierarchical chain, including starch mono-, di-, oligo- and polysaccharides, chitin, chitozan and cellulose. Polysaccharide interactions with diverse solvents and low-molecular, macrocyclic and high-molecular substances in solutions are scrutinized. Several aspects of mechanical-chemical modification of polysaccharides in solid state and in gel are observed. Modern concepts of enzyme degradation of polysaccharides and technologies of natural polymers processing are analyzed. The book is intended for wide range of readers: students, post graduates, engineers and scientists engaged in polymer chemistry, organic and physical chemistry.
Author: Biman Bagchi
Publisher: Cambridge University Press
ISBN: 1107037298
Category : Medical
Languages : en
Pages : 383
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Book Description
A unified overview of the dynamical properties of water and its unique and diverse role in biological and chemical processes.
Author: Hisashi Koga
Publisher: Methods in Molecular Biology
ISBN:
Category : Medical
Languages : en
Pages : 292
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Book Description
This book orchestrates the differential fields of technology in order to create a new era of the study of reverse chemical genetics. It introduces fundamental resources as well as the modification of these resources by recent molecular technologies.
Author: University of California (1868-1952)
Publisher:
ISBN:
Category : Universities and colleges
Languages : en
Pages : 1492
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Book Description
Author:
Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 732
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Book Description
