Results 221 to 230 of about 185,932 (259)

Soil physical and chemical barriers to more efficient water use by crops

Agricultural Meteorology, 1974
ABSTRACT Reuss, J. O. and Danielson, R. E., 1974. Soil physical and chemical barriers to more efficient water use by crops. Agric. Meteorol., 14: 129–152. The potential exists for significant gains in crop production through plant modification, for improved adaptation to soil physical and chemical conditions.
J.O. REUSS, R.E. DANIELSON
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The Water Barrier in Human Epidermis

Archives of Dermatology, 1963
The rate of water vapor transpiration through normal excised human skin at 10 to 20 C is 2.9 gm/sq m/hr, with a standard deviation of 1.9 gm/sq m/hr. The rate of water vapor transpiration through excised skin is not affected by freezedrying, rapid freezing in 15% glycerol solution to 68 C, exposure to 0.1 normal sodium hydroxide or to 6 M urea for 24 ...
H D, ONKEN, C A, MOYER
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Condoms as physical and chemical barriers against human immunodeficiency virus.

JAMA, 1988
In an in vitro model, 20 condoms containing 0.9 mL of 6.6% (vol/vol) nonoxynol 9 and ten condoms without nonoxynol 9 were tested as physical and chemical barriers against human immunodeficiency virus (HIV). Each condom was mounted on a hollow dildo and placed in a glass cylinder. The HIV inoculum and HIV-free medium were placed on opposite sites of the
C A, Rietmeijer, J W, Krebs, P M, Feorino, F N, Judson   +3 more
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Physics of metal-corrrelated barrier with chemical modulation-metal heterostructure

Physica B: Condensed Matter, 2014
Abstract Barrier planes described by the Ionic Hubbard model sandwiched between metallic planes on both sides are studied using unrestricted Hartree Fock. For zero onsite correlation, the presence of the metallic interface generates an additional gap in the energy spectrum away from half filling, if the chemically modulated potential in the barrier ...
Tribikram Gupta, Sanjay Gupta
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Mucosal physical and chemical innate barriers: Lessons from microbial evasion strategies

Seminars in Immunology, 2015
The innate immune system has evolved since millions of years under a selective pressure. Among the different host mechanisms selected and conserved as a first line of defense, the gastrointestinal mucus layer constitutes an efficient physical and chemical barrier against invading microbes.
Brice, Sperandio, Natalie, Fischer, Philippe J, Sansonetti   +2 more
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Physical barriers: an alternative to prevent negative impacts of chemically treated wood

Journal of the Indian Academy of Wood Science, 2013
There exists a possibility of leaching out of chemicals along with preservative components from chemically treated wood on exposure to water or moisture. Physical barriers have gained much acceptance in this regard as alternative non-biocidal wood protection method as it is supposed to reduce leaching and subsequent negative impacts of wood ...
A. Sreeja, Leela Edwin
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Fragrant chitosan nanospheres: Controlled release systems with physical and chemical barriers

Carbohydrate Polymers, 2011
Abstract Existing fragrance controlled release systems are either based on a physical barrier, such as entrapment of the fragrant molecules inside the micro- or nano-spheres, or a chemical barrier, such as labile chemical bonds. Here, we propose a system with a combination of the two approaches but fabricated via a simple surfactant free one step ...
Thapakorn Tree-udom, Supason P. Wanichwecharungruang, Jiraporn Seemork, Sunatda Arayachukeat   +3 more
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Composite prostheses used to repair abdominal wall defects: Physical or chemical adhesion barriers?

Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2005
AbstractIn a composite prosthesis, the component placed at the peritoneal interface takes the form of a physical or chemical barrier. In this experimental study performed on the white New Zealand rabbit, several composites were examined to establish the effectiveness of these barriers at impeding adhesion formation.
J M, Bellón, N, Serrano, M, Rodríguez, N, García-Honduvilla, G, Pascual, J, Buján   +5 more
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Assessment of skin barrier function and biochemical changes of ex vivo human skin in response to physical and chemical barrier disruption

European Journal of Pharmaceutics and Biopharmaceutics, 2017
Topical dermatotherapy is intended to be used on diseased skin. Novel drug delivery systems even address differences between intact and diseased skin underlining the need for pre-clinical assessment of different states of barrier disruption. Herein, we studied how short-term incubation in culture media compared to incubation in humidified chambers ...
Nadine, Döge, Araks, Avetisyan, Sabrina, Hadam, Eva Katharina Barbosa, Pfannes, Fiorenza, Rancan, Ulrike, Blume-Peytavi, Annika, Vogt   +6 more
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Physical and chemical behaviour of clay-based barriers under percolation with test liquids

Engineering Geology, 1985
Abstract A research and development-project is being carried out at the University of Braunschweig, West Germany, in which the permeability and durability of clayey liners for waste deposits are investigated. Results of long-term permeability tests with different aggressive test liquids (distilled water, two organic and five inorganic test liquids ...
H. Simons, E. Reuter
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