Results 251 to 260 of about 825,143 (309)
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Pure and Applied Chemistry, 1976
Abstract A small grain of iron catalyst, used in the synthesis of ammonia, has an external surface of about 1 cm2/g, but it has an internal surface of 100,000 cm2/g. Since catalysis takes place on the surface, obviously the surface in the pores is of vital importance.
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Abstract A small grain of iron catalyst, used in the synthesis of ammonia, has an external surface of about 1 cm2/g, but it has an internal surface of 100,000 cm2/g. Since catalysis takes place on the surface, obviously the surface in the pores is of vital importance.
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Pore structure analysis without a pore shape model
Journal of Colloid and Interface Science, 1967Abstract All methods presently employed for pore structure analysis are based on idealized models for the pore shapes. Most investigators assume that the pores are cylindrical; some use the parallel plate pore model. The extent to which valid inferences can be drawn from the structure curves based on such idealizations is open to question.
Stephen Brunauer +2 more
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Fuel, 2015
Abstract Pore connectivity is limited in shale formations, unlike in conventional reservoirs, for which cyclic void models, such as the regular-lattice model, are often used to represent the connectivity. In the cyclic models, the random assignment of throat sizes to lattice elements leads to a plateau-like variation of a capillary pressure with ...
A. Sakhaee-Pour, Steven L. Bryant
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Abstract Pore connectivity is limited in shale formations, unlike in conventional reservoirs, for which cyclic void models, such as the regular-lattice model, are often used to represent the connectivity. In the cyclic models, the random assignment of throat sizes to lattice elements leads to a plateau-like variation of a capillary pressure with ...
A. Sakhaee-Pour, Steven L. Bryant
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Structural analysis of mitochondrial pores
Experientia, 1990Structural information about the channel in the mitochondrial outer membrane, derived from sequence analysis and electron microscopy of two-dimensional crystals, is summarized. A model for the channel is presented, consisting of a cylindrical beta-barrel that is formed by one or two 30-kDa polypeptides, with an alpha-carbon backbone diameter of 3.8 nm.
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Nuclear pore structure and function
Seminars in Cell Biology, 1992Nuclear pores are huge macromolecular assemblies, approximately 120 nm in diameter, that perforate the nuclear membrane and mediate nucleocytoplasmic transport. Nuclear pores are constructed from a cylindrical spoke-plug complex sandwiched between nucleoplasmic and cytoplasmic rings.
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Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1990
Small-angle x-ray scattering has been used in an investigation of the pore structure of “sivol,” a material prepared by thermochemical treatment of chrysotile asbestos. It has been shown that sivol has a well-developed pore structure. Pore size distribution curves have been obtained, showing a maximum with a radius of gyration R=2.5–3.0 nm.
G. M. Plavnik +3 more
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Small-angle x-ray scattering has been used in an investigation of the pore structure of “sivol,” a material prepared by thermochemical treatment of chrysotile asbestos. It has been shown that sivol has a well-developed pore structure. Pore size distribution curves have been obtained, showing a maximum with a radius of gyration R=2.5–3.0 nm.
G. M. Plavnik +3 more
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Pore-forming bacteriocins: structural–functional relationships
Archives of Microbiology, 2018Peptides and proteins are important bioorganic compounds in nature, among which a special place is occupied by antimicrobial substances. There are more than 2000 different antimicrobial peptides (AMPs) produced by a variety of living organisms. Bacteriocins produced by bacteria are the minor group, whose chemical structures are most complicated among ...
Alexey S, Vasilchenko +1 more
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Imaging the Pore Structure of Geomaterials
Science, 1995Laser scanning confocal microscopy can be used to image the pore structure of geologic materials in three dimensions at a resolution of 200 nanometers. The technique involves impregnation of the void space with an epoxy doped with a fluorochrome whose fluorescent wavelength matches the excitation wavelength.
Fredrich, J. +2 more
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2013
Dependence of texture on the pore structure is one of the most important fields of research. This is due to high sample-to-sample variations in application of mechanical tests. Tension, compression and flexure tests are the most common mechanical tests used in texture evaluation.
Alper Gueven, Zeynep Hicsasmaz Katnas
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Dependence of texture on the pore structure is one of the most important fields of research. This is due to high sample-to-sample variations in application of mechanical tests. Tension, compression and flexure tests are the most common mechanical tests used in texture evaluation.
Alper Gueven, Zeynep Hicsasmaz Katnas
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Nuclear Pore Complex Structure in Birds
Journal of Structural Biology, 1997The nuclear envelope consists of two parallel membranes enclosing an aqueous lumen. In places there are pores in both membranes at which the two membranes are joined. Within these pores reside the nuclear pore complexes. The current structural models of the nuclear pore complex have been derived from a number of studies using different electron ...
M W, Goldberg, I, Solovei, T D, Allen
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