Physical and Chemical Studies of a Limited Reaction of Iodine with Proteins

The purpose of this study is study of the physical and chemical properties of the overburden of the Dzherdanak deposit. The chemical and mineralogical composition of the overburden of the Djerdanak deposit has been studied by the methods of X-ray and thermography, electron microscopy and infrared spectroscopy. The main phases are quartz, kaolinite and muscovite. The study of the fine structure of the rock under an electron microscope showed the homogeneity of the rock with pronounced uniform inclusions, which is preserved even after firing. Changes in the rock after firing at 1050 °C have been determined. The formation of mullite at this temperature has been established.

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NIKOLAY SEMENOVICH LEZNOV: BIOGRAPHY AND CONTRIBUTION TO THE DEVELOPMENT OF SCIENCE

Proceedings of VIAM ◽

10.18577/2307-6046-2021-0-7-112-124 ◽

2021 ◽

pp. 112-124

Author(s):

N.S. Kitaeva ◽

◽

Yu.M. Shiryakina ◽

R.R. Mukhametov ◽

R.O. Shitov ◽

...

Keyword(s):

Science And Technology ◽

Polymer Materials ◽

Life Stages ◽

Metallic Materials ◽

Chemical Studies ◽

Physical And Chemical

The main life stages of a doctor of technical sciences, professor, honored worker of science and technology of the RSFSR, a major specialist in the field of creation and implementation of polymers for new aviation materials, whose name was Nikolai Semenovich Leznov (12/17/1904–06/25/1984), were considered. The scientific works and achievements of the founder of the laboratory for the synthesis of polymers, binders for non-metallic materials, special liquids and physical and chemical studies of polymer materials of VIAM were analyzed and described.

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Polyurethane foam based biofilter media for toluene removal

Water Science & Technology ◽

10.2166/wst.2001.0664 ◽

2001 ◽

Vol 43 (11) ◽

pp. 35-42 ◽

Cited By ~ 8

Author(s):

W. M. Moe ◽

R. L. Irvine

Keyword(s):

Gas Phase ◽

Polyurethane Foam ◽

Solid Support ◽

High Porosity ◽

Residence Times ◽

Nutrient Limitations ◽

Support Medium ◽

Volatile Organic ◽

Chemical Studies ◽

Physical And Chemical

Polyurethane foam medium was manufactured and analyzed to determine its suitability as a solid support medium for use in gas-phase biofilters. Physical and chemical studies were conducted to determine the medium's characteristics. The medium's ability to support an active biofilm capable of degrading volatile organic compounds was assessed using a laboratory scale biofilter fed a model waste stream containing toluene for more than 250 days with empty bed residence times (EBRTs) ranging from two to four minutes. Results are presented that show how a polyurethane foam medium with high porosity, suitable pore size, low density, and an ability to sorb water was able to remove over 99% of the influent toluene when fed at a concentration of 200 ppmv. An operating strategy is described which effectively prevented two problems common to conventionally operated biofilter systems: nutrient limitations and biosolid accumulation.

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The tobacco mosaic virus particle: structure and assembly

Philosophical Transactions of the Royal Society B Biological Sciences ◽

10.1098/rstb.1999.0404 ◽

1999 ◽

Vol 354 (1383) ◽

pp. 531-535 ◽

Cited By ~ 317

Author(s):

A. Klug

Keyword(s):

Tobacco Mosaic Virus ◽

Mosaic Virus ◽

Virus Particle ◽

Particle Structure ◽

Short Account ◽

Complex Process ◽

Chemical Studies ◽

Rna Hairpin ◽

Physical And Chemical ◽

Tobacco Mosaic Virus Particle

A short account is given of the physical and chemical studies that have led to an understanding of the structure of the tobacco mosaic virus particle and how it is assembled from its constituent coat protein and RNA. The assembly is a much more complex process than might have been expected from the simplicity of the helical design of the particle. The protein forms an obligatory intermediate (a cylindrical disk composed of two layers of protein units), which recognizes a specific RNA hairpin sequence. This extraordinary mechanism simultaneously fulfils the physical requirement for nucleating the growth of the helical particle and the biological requirement for specific recognition of the viral DNA.

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EFFECTIVENESS, BEHAVIOR, AND TOXICITY OF DISPERSANTS

International Oil Spill Conference Proceedings ◽

10.7901/2169-3358-1983-1-65 ◽

1983 ◽

Vol 1983 (1) ◽

pp. 65-71 ◽

Cited By ~ 6

Author(s):

Donald Mackay ◽

Peter G. Wells

Keyword(s):

Water Column ◽

Oil Spills ◽

Current Status ◽

Dispersed Oil ◽

Chemical Studies ◽

Key Issues ◽

Oil Emulsions ◽

Dispersant Effectiveness ◽

Individual Hydrocarbons ◽

Physical And Chemical

ABSTRACT Three key issues must be addressed when deciding on the desirability of using chemical dispersants for mitigating the adverse effects of oil spills: (1) how effective a given dosage of dispersant will be on a given oil slick; (2) how the dispersed oil and dispersant diffuse into the water column, dissolve, volatilize, degrade, and interact with suspended and bottom sediments; and (3) what effects the dissolved and particulate oil and dispersant will have on water column and benthic biota. It is essential that the first two areas (physical and chemical studies) relate closely to the third (biological aspects) in order that bioassay exposure (in terms of concentration of dispersant, classes of and individual hydrocarbons, and duration) addressing the toxicity issue be realistic. Here, we review the current status of a research program which addresses these issues. Under the program, attempts are being made to quantify dispersant effectiveness (including consideration of effectiveness testing using the Mackay-Nadeau-Steelman system for oils which have evaporated and/or formed water-in-oil emulsions to various extents), water column diffusion, and partitioning of specific hydrocarbons among water, oil, and suspended sediment as well as into the atmosphere. A procedure is described which has been used to quantify the acute toxicity of dispersants to copepods and which is being extended to apply also to the toxic contributions of dissolved and particulate oil. Hopefully, by assembling quantitative expressions for effectiveness, behavior, and toxicity, those situations in which dispersion is desirable can be better identified.

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