Results 271 to 280 of about 68,115 (310)

On the mechanism of collapse of monolayers of macromolecular substances: poly(l, d, and dl)alanine

Journal of Colloid and Interface Science, 1981
Abstract The collapse process of monolayers of poly( l , d , dl )alanine has been studied at the air—water interface, and on substrates containing Ca2+, Na+, and K+. It is demonstrated that the collapse process occurs in two stages. The first, attributable to a process of nucleation, is related to the detachment of the polymeric chains from the ...
GABRIELLI, GABRIELLA, BAGLIONI, PIERO, FERRONI, ENZO   +2 more
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AGGREGATION PATTERNS AND MACROMOLECULAR MORPHOLOGY OF HUMIC SUBSTANCES: A FRACTAL APPROACH

Soil Science, 1999
Fractal geometry provides a powerful means for the quantitative description of heterogeneous and highly irregular systems encountered in nature. Humic substances represent a typical class of natural compounds that may be amenable to a fractal description because of their well known physical and chemical heterogeneity and molecular complexity.
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MACROMOLECULAR PROPERTIES OF SOIL HUMIC SUBSTANCES: FACT, FICTION, AND OPINION

Soil Science, 1999
A critical review of 'random coil' and 'self-associating aggregate' models and of earlier concepts of the macromolecular structure of humic substances (HS) is undertaken as a result of the development of more recent information and hypotheses.
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Proton magnetic resonance studies on water in the presence of various macromolecular substances

Journal of Molecular Biology, 1959
Because of the magnetic properties associated with atomic nuclei, it is possible to measure the absorption of electromagnetic radiation (40–60 Mc/s) by protons when a sample is placed in a strong magnetic field (10,000–15,000 gauss). By keeping the radio-frequency constant and varying the magnetic field an absorption curve having a maximum at the so ...
Aksel A. Bothner-By, Aksel A. Bothner-By, Aksel A. Bothner-By, John Gergely, John Gergely, John Gergely, Endre A. Balazs, Endre A. Balazs, Endre A. Balazs   +8 more
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Synthesis of Macromolecular Substances by Condensation Polymerization and Stepwise Addition Polymerization

2001
Condensation polymerizations (polycondensations) are stepwise reactions between bifunctional or polyfunctional components, with elimination of simple molecules such as water or alcohol and the formation of macromolecular substances. For the preparation of linear condensation polymers from bifunctional compounds (the same considerations apply to ...
Helmut Ritter, h.c. Dietrich Braun, Harald Cherdron   +2 more
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Urinary Macromolecular-Inhibitory-Substances of Calcium-Oxalate-Monohydrate Crystal Growth

1989
It is well known that urinary glycosaminoglycans (GAG) exert inhibitory activity on crystal growth and aggregation. The purpose of this study was to evaluate the inhibitory activity of GAG in a natural form, namely as proteoglycan or glycoprotein.
Atsushi Matsumoto, Akira Wakatsuki, Shunji Nishio, Hidenobu Iwata, Masafumi Takeuchi   +4 more
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A vibrating membrane bioreactor (VMBR): Macromolecular transmission—influence of extracellular polymeric substances

Chemical Engineering Science, 2009
Abstract The vibrating membrane bioreactor (VMBR) system facilitates the possibility of conducting a separation of macromolecules (BSA) from larger biological components (yeast cells) with a relatively high and stable macromolecular transmission at sub-critical flux. This is not possible to achieve for a static non-vibrating membrane module.
Gunnar Eigil Jonsson, Søren Prip Beier
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Structure and properties of polyelectrolyte complexes consisting of polysaccharide, polypeptide, and a synthetic macromolecular substance

Die Makromolekulare Chemie, Rapid Communications, 1985
Reaction du chlorhydrate de diethylamino-2 ethyldextrane avec un melange de poly-2 glutamate de sodium et de sulfate de potassium de l'alcool ...
Naoji Kubota, Yasuo Kikuchi
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Ultrasonic velocity in macromolecular substances [PDF]

Journal of Polymer Science, 1949
M. Baccaredda, Giulio Natta
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Deep eutectic solvent: Synthesis, classification, properties and application in macromolecular substances

International Journal of Biological Macromolecules
Deep eutectic solvent (DES) is a kind of solvent prepared by mixing hydrogen bond donors and hydrogen bond acceptors, and have become a hot topic in ecological civilization construction due to its low toxicity and sustainability. Its excellent properties such as low volatility, thermal stability and biodegradability make it stand out among many organic
Yuying, Gao, Min, Fan, Xiaoxiao, Cheng, Xiaofang, Liu, Hui, Yang, Wenya, Ma, Min, Guo, Li, Li   +7 more
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