Search Results - (Author, Cooperation:R. Krishna)

2018-05-16

National Academy of Sciences

0027-8424

1091-6490

Biology

Medicine

Natural Sciences in General

2016-05-21

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2016-02-26

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2012-03-31

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2013-05-25

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1089-7623

AIP Digital Archive

Physics

Electrical Engineering, Measurement and Control Technology

The long trace profiler (LTP) was developed in order to measure the mid- and long-period variations in optical components for beamlines of high-brightness synchrotron sources. The LTP is a slope measuring instrument, and the optic under test is typically measured along a single tangential line, giving a two-dimensional profile. If a three-dimensional height profile (surface map) is desired, it is necessary to combine the integrated slopes of several measurements. A series of LTP measurements and a data processing method used to combine standard LTP data into a three-dimensional height profile are described. The measurement of a synchrotron beamline mirror and its three-dimensional height profile are presented. © 1995 American Institute of Physics.

Electronic Resource

1749-6632

Blackwell Publishing Journal Backfiles 1879-2005

Natural Sciences in General

Electronic Resource

1089-7550

AIP Digital Archive

Physics

This article presents numerical studies on the deformation of particles during dynamic compaction of metal powders. The analysis of the process is based on a micromechanics approach using multiple particle configurations. The material considered is elastoviscoplastic with interparticle friction. Two-dimensional studies on particles in close packed arrangement were carried out using plane strain conditions for deformation and thermal response. The finite element method using an explicit dynamic analysis procedure was used for the simulations. The influence of speed of compaction, strain hardening, strain rate dependency, interparticle friction and size of the powder particles on the final shape and temperature variations within the particles were analyzed. The studies offer useful information on the shape and temperature variations within the particles. The results provide a better understanding of the dynamic compaction process at the micromechanics level. © 1999 American Institute of Physics.

Electronic Resource

1550-7408

Blackwell Publishing Journal Backfiles 1879-2005

Biology

SYNOPSIS. Hartmannella (Culbertson strain A-1) was found to undergo encystment (80–90% in 72 hr) on a non-nutrient agar containing 0.015 M MgCl2 and 0.02 M taurine. Encystment was completely inhibited by 1 × 10−5 M Mitomycin C, or 1 × 10−7 M cycloheximide or 1 × 10−6 M Actinomycin D. The ability of the amoebae to consume glucose increased fourfold within 24 hr incubation in this medium. The specific activities of cellulose synthetase, hexosephosphate transaminase and uridine diphosphosphoglucose pyrophosphorylase were also stimulated. Dehydrogenases mediating electron transfer from pyruvate, malate, succinate, α-ketoglutarate and α-glycerophosphate to triphenyltetrazolium and from glucose-6-phosphate to nicotinamide-adenine dinucleotide phosphate were, however, repressed during this period of incubation in the encystment medium. The results suggested that, during encystment of Hartmannella A-1, there was a metabolic switchover and the enzyme machinery of the amoeba was oriented more towards biosynthesis of cyst wall constituents than towards the aerobic breakdown of carbohydrates.

Electronic Resource

1550-7408

Blackwell Publishing Journal Backfiles 1879-2005

Biology

SYNOPSIS. Serologic reactions elicited by sonically ruptured trophic and cystic forms of Hartmannella culbertsoni were studied. The antigens of trophic amoebae reacted with their homologous rabbit antiserum showing multiple precipitin lines which could not be seen when the reacting antigens were treated with trypsin prior to application on the Ouchterlony plates. Antigens of trophic amoeba did not react with antiserum against cysts. Cyst antigens reacted with their homologous antiserum only after trypsin treatment. Antigens prepared from trophozoites excysting from cysts reacted positively with the antiserum against antigens of trophic amoebae.Antigens of trophic as well as cystic forms fixed guinea pig complement in presence of their homologous antisera. With the trophic form, this property was abolished after trypsin treatment. Non-specific complement fixation mediated by cyst antigens was abolished by treatment with cellulase. Antiserum against trophic amoebae immobilized trophozoites and, in the presence of guinea pig complement, led to their lysis.

Electronic Resource

1550-7408

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Hartmannella culbertsoni trophozoites are transformed into viable cysts on exposure to a non-nutrient agar medium containing 15 mM MgCl2 and 20 mM taurine. Amebae differentiating in this encystment medium incorporate more uracil-2-14C into RNA and more leucine-1-14C or valine-1-14C into proteins than controls. Encysting organisms incorporate significantly more glucose-U-14C into cellulose and glucosamine-1-14C into mucopolysaccharides. Incorporation of glucose-U-14C into cellulose and of glucosamine-1-14C into mucopolysaccharides are inhibited by actinomycin D or cycloheximide.

Electronic Resource

0010-7565

General, Interdisciplinary

1436-5073

Springer Online Journal Archives 1860-2000

Chemistry and Pharmacology

Zusammenfassung Molybdän (VI) wird in Gegenwart von Thiocyanat und Chinolin (oder ähnlichen Basen) in 2,5-m Salzsäure sehr rasch zu Mo(V) reduziert. Dieses wird als [MoO(Chin)2(SCN)3] mit Nitrobenzol extrahiert. Die orangerote Lösung hat ihr Absorptionsmaximum bei 470 nm; die molare Extinktion beträgt 18 000±200. Bis 5μg Mo/ml entspricht die Lösung dem Beerschen Gesetz. Cu(II), Fe(III), Ti(IV) und W(VI) stören, doch läßt sich diese Störung beseitigen.

Summary Molybdenum (VI) is reduced to the pentavalent state very rapidly in the presence of thiocyanate and quinoline (or similar bases) in 2.5M hydrochloric acid medium. It distributes into nitrobenzene as [MoO(Qn)2(SCN)3] giving a orange red extract with maximum absorbance at 470 nm and molar absorbance 18 000 ±200. The system obeys Beer's law up to 5μg of Mo per ml. Cu(II), Fe(III), Ti(IV) and W(VI) interfere; but methods have been developed for the elimination of interference.

Electronic Resource

1432-0630

71.25P ; 78.70

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Physics

Abstract The effect of theα-γ or bcc-fcc phase transition on the electron momentum distribution and Compton profiles of iron has been theoretically examined by a band structure calculation in the two phases. The calculated band Compton profile for the bcc phase shows a good agreement with the experimental results by Phillips and Weiss. The calculated directional Compton profiles show significant changes while going from the bcc to the fcc phase.

Electronic Resource

1432-0614

Springer Online Journal Archives 1860-2000

Biology

Process Engineering, Biotechnology, Nutrition Technology

Summary Incubation of acetates of geraniol, citronellol and linalool with Aspergillus niger resulted in their hydrolysis to corresponding alcohols which were further hydroxylated to their respective 8-hydroxy derivatives. In the case of linalyl acetate, besides linalool and 8-hydroxylinalool, small amounts of geraniol and α-terpineol were also formed. Microsomes (105 000xg sediment) prepared from induced cells of A. niger were found to convert (1-3H)citronellol to 8-hydroxy citronellol in the presence of NADPH and O2. The pH optimum for the hydroxylase was found to be 7.6.

Electronic Resource

1420-9136

Chlorofluoromethane ; Ozone ; Photochemistry ; 2-D model

Springer Online Journal Archives 1860-2000

Geosciences

Physics

Abstract two-dimensional time dependent model of the stratosphere incorporating the major interactions between radiative-photochemical and dynamical processes is described. The main prognostic equations considered are the thermodynamic equation and the general conservation equation for the minor chemical constituents representing the odd oxygen (O x =O+('D)+O3), odd hydrogen (HO x =HO+HO2), N2O, odd nitrogen (NO x =NO+NO2+HNO3), CF2Cl2, CFCl3 and odd chlorine (Cl x =Cl+ClO+HCl). The zonal wind and mean meridional circulations are determined diagnostically by the integration of the thermal wind equation and the stream function equation in the meridional plane espectively. The large scale eddy processes are parameterized in terms of zonal mean quantities using the generalized diffusion formulation on a sloping surface. The radiative heating and cooling and the hotochemical sources and sinks are incorporated in a form which allows for the major interactions among the minor trace constituents, temperature and mean circulation. Two integrations consisting of natural stratosphere and a stratosphere contaminated by the chlorofluoromethanes through lower boundary fluxes are carried out for 23 model years by changing the declination of the sun every day and using 6-hour time step. The model simulations of temperature, mean circulation, ozone, HO x , N2O and NO x in the meridional plane for the normal stratosphere, show satisfactory agreement with the available observations. Based on the results of second integration it is found that the injection of chlorofluoromethanes in the atmosphere at the estimated current production rates can lead to significant changes in the meridional distribution of ozone, temperature and NO x in the middle and upper stratosphere. The results also indicate that the percentage total ozone depletion increases from tropics to high latitudes and from summer to winter high latitudes. Also discussed are the results of additional experiments incorporating the reaction of HO2 with NO and the reactions involving ClNO3.

Electronic Resource

1432-0967

Springer Online Journal Archives 1860-2000

Geosciences

Abstract Utilising about 170 chemical analyses of granitic rocks of proved origin from different parts of the world, a new field is suggested in the Ca-Na-K (ionic weight per cent) trilinear diagram to distinguish the replacement from the magmatic type.

Electronic Resource

1432-0924

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Abstract A new finite element crack growth algorithm has been developed to simulate dynamic fracture. In this algorithm, pseudo elements with very high initial density are placed below the crack plane and the density is reduced to zero in a gradual manner as the crack passes the element. A number of linear elastic and elasto-viscoplastic problems have been carried out to test the new algorithm. The results are compared with some of the existing crack growth models.

Electronic Resource