Results 211 to 220 of about 2,713 (253)
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Macromolecular material (humic substance) in the water column and sediments
Marine Chemistry, 1992Abstract The progress during the past 10–15 years in the studies of organic macromolecules (humic substances, HS) in seawater and sediments is reviewed. The review describes the advances in the characterization of seawater and sedimentary HS, HS formation models, studies on the geochemical role of marine HS, and future research needs.
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Microvascular Research, 1980
Abstract Bradykinin (0.8 μg base/min) infused locally intraarterially into canine forelimbs perfused at constant inflow causes marked increases in lymph flow rate and lymph total protein concentration. This same dose of bradykinin infused locally intraarterially for 60 min into forelimbs perfused at constant inflow with vasopressin (0.8 P.U./min) or ...
Bhagavan S. Jandhyala +2 more
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Abstract Bradykinin (0.8 μg base/min) infused locally intraarterially into canine forelimbs perfused at constant inflow causes marked increases in lymph flow rate and lymph total protein concentration. This same dose of bradykinin infused locally intraarterially for 60 min into forelimbs perfused at constant inflow with vasopressin (0.8 P.U./min) or ...
Bhagavan S. Jandhyala +2 more
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Modes of Absorption of Macromolecular Substances
1995When we speak about absorption of macromolecular substances we must take into consideration the barriers of the gastrointestinal tract which hinder their uptake and transportation into the lymphatics and the blood. These barriers can be differentiated into morphological and functional barriers.
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On the mechanism of collapse of monolayers of macromolecular substances: poly(l, d, and dl)alanine
Journal of Colloid and Interface Science, 1981Abstract 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 +2 more
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AGGREGATION PATTERNS AND MACROMOLECULAR MORPHOLOGY OF HUMIC SUBSTANCES: A FRACTAL APPROACH
Soil Science, 1999Fractal 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, 1999A 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, 1959Because 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 +8 more
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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 +2 more
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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 +2 more
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Urinary Macromolecular-Inhibitory-Substances of Calcium-Oxalate-Monohydrate Crystal Growth
1989It 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 +4 more
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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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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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