Search Results - (Author, Cooperation:B. Bhat)

2011-06-10

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Adipocytes/cytology/metabolism ; Animals ; Caveolin 1/metabolism ; Cell Size ; Diabetes Mellitus, Type 2/physiopathology ; Disease Models, Animal ; Gene Expression ; Gene Expression Regulation ; Gene Silencing ; Glucose/metabolism ; Homeostasis ; Hyperglycemia/physiopathology ; Insulin/*metabolism ; Liver/metabolism ; Male ; Mice ; Mice, Inbred C57BL ; MicroRNAs/genetics/*metabolism ; Signal Transduction ; Up-Regulation

1745-4565

Blackwell Publishing Journal Backfiles 1879-2005

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Process Engineering, Biotechnology, Nutrition Technology

Black pepper, its oleoresin or its active principle piperine fed to rats at doses 5 to 20 times normal human intake did not cause any adverse effect on: (1) growth, food efficiency ratio and organ weights; (2) RBC, WBC and differential counts; (3) the levels of blood constituents like hemoglobin, total serum proteins, albumin, globulin, sugar and cholesterol; (4) the levels of serum aminotransferases and phosphatases and (5) fat and nitrogen balance.

Electronic Resource

0040-4020

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Chemistry and Pharmacology

Electronic Resource

0040-4039

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Chemistry and Pharmacology

Electronic Resource

1432-0681

Springer Online Journal Archives 1860-2000

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

Übersicht Mit Hilfe der verallgemeinerten Fourier-Analyse werden lineare Plattenschwingungen mit Dämpfung bei stochastischer Erregung behandelt. Die Spektraldichte der Druckerregung wird dabei in einer besonderen Form (mit ausgeprägtem Maximum) angenommen, wie sie oft bei tatsächlichen technischen Problemen vorhanden ist. Die Raumkorrelation des Drucks über die Plattenoberfläche sei Eins. Lösungen des Problems werden numerisch ausgearbeitet bis zu den Kreuzkorrelationsfunktionen für die Beschleunigung und die Biegespannungen, wobei der quadratische Mittelwert des Erregerdrucks und einige zur Beschreibung der speziellen Spektraldichte nötigen Kennwerte verwendet werden. Für die Mittelpunkte von Rechteckplatten mit allseitig-drehbaren und allseitig-eingespannten Rändern sind die Autokorrelationsfunktionen dimensionslos in Diagrammen dargestellt.

Summary Generalized harmonic analysis was applied to solve the linear response problem of vibrating elastic plates with damping under stochastic pressure. The power spectral density of the external pressure was taken to be of a typical peaked shape resembling actual physical conditions. The spatial correlation of pressure over the plate area was taken to be unity. Results give the cross-correlation functions for the acceleration and stresses in terms of the mean-square value of the load and the characteristic constants used to describe the power spectral density curve. For the centres of rectangular plates with simply-supported and built-in edges dimensionless response autocorrelation functions are plotted.

Electronic Resource

1420-9071

Springer Online Journal Archives 1860-2000

Biology

Medicine

Summary Giemsa staining of hop (Humulus lupulus L.) chromosomes at metaphase revealed kinetochore-like structures in the centromeric region.

Electronic Resource

1573-4803

Springer Online Journal Archives 1860-2000

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

Abstract A procedure to estimate the effective elastic moduli and coefficient of thermal expansion (CTE) of particulate-reinforced metal matrix composites (MMCs) using a two-dimensional finite element method is presented. The actual microstructural geometry of the composites with randomly distributed second-phase particles is incorporated in the model. A generalized plane strain technique, realistically to describe the three-dimensional behaviour, is also incorporated in the model. The elastic moduli and the CTE, estimated using this model, agree favourably with the experimental data. The technique is shown to be superior compared to the conventional two-dimensional plane stress and plane strain approximations. Also, the results indicate that the effect of the shape of the randomly distributed second-phase particles on the effective elastic moduli is insignificant. Although the procedure is demonstrated for particulate MMCs, it can be easily extended to many other materials as well.

Electronic Resource

1573-4803

Springer Online Journal Archives 1860-2000

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

Abstract Microstructure of wrought, laser and electron beam processed NARloy-Z (Cu-3 wt% Ag–0.5 wt% Zr) was investigated for thermal stability at elevated temperatures 539–760°C (1100 to 1400°F) up to 94 h. Optical and scanning electron microscopy and electron probe microanalysis were employed for studying microstructural evolution and kinetics of precipitation. Grain boundary precipitation and precipitate free zones (PFZs) were observed in the wrought alloy after exposing to temperatures above 605°C (1120°F). Fine-grained microstructure observed in the laser and electron beam (EB) processed NARloy-Z was much more stable at elevated temperatures. Tensile properties of laser and EB glazed NARloy-Z can be tailored by giving suitable heat treatments and maintaining the same strength with increased ductility. Microstructural changes correlated well with hardness measurements and mechanical properties.

Electronic Resource

1432-2242

Springer Online Journal Archives 1860-2000

Biology

Summary Reciprocal crosses between varieties of maize were developed in such a way that the genome of one variety was introduced into the cytoplasm of the other in fractions of 25, 50, and 75 per cent. Cytoplasmic effects on yield, maturity, plant height, and ear height were measured at each of the three nuclear constitutions. The results indicated that the cytoplasmic effects on quantitative characters were not consistently produced irrespective of the nuclear constitution and some relationship existed between the number of polygenes introduced and the cytoplasmic effects. The hypothesis was put forward that cytoplasmic effects on quantitative characters would be expressed only when the genes of one parent remained below a certain threshold concentration in the hybrid nucleus. Once this level was crossed by increasing the number of genes alien to the cytoplasm the cytoplasmic effects disappeared.

Electronic Resource

1573-5060

Chrysanthemum cinerariaefolium ; pyrethrum ; breeding ; mass selection ; recurrent selection ; population improvement

Springer Online Journal Archives 1860-2000

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Summary A population improvement programme in pyrethrum had progressively increased the mean pyrethrins content from 1.33 percent in the unselected base population to 1.97 percent in the population developed after one cycle of each of mass and recurrent selections. The selection had also increased the range of variation and the relative frequency of desirable plants.

Electronic Resource

1573-6857

Springer Online Journal Archives 1860-2000

Biology

Abstract Intervarietal reciprocal F1's and backcrosses were made between varieties of maize to study the cytoplasmic effects on quantitative characters like grain yeild, maturity, plant and ear heights, and number of ears per plant. It was found that the expression of all characters except the number of ears per plant was modified by the cytoplasm. Cytoplasmic effects were explained on the basis of the “plasmon-sensitive genes” hypothesis.

Electronic Resource

1572-9559

Springer Online Journal Archives 1860-2000

Physics

Abstract The dispersion characteristics of a shielded suspended dielectric are computed using mode matching technique. From the dispersion characteristics the dielectric and conductor loss, quality factor and wave impedances are derived. The dimensions of shielded suspended dielectric are same as that of a rectangular metallic wave guide at Ka band.

Electronic Resource

1573-4803

Springer Online Journal Archives 1860-2000

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

Abstract The hot-working characteristics of the metal-matrix composite (MMC) Al-10 vol % SiC-particulate (SiCp) powder metallurgy compacts in as-sintered and in hot-extruded conditions were studied using hot compression testing. On the basis of the stress-strain data as a function of temperature and strain rate, processing maps depicting the variation in the efficiency of power dissipation, given by η = 2m/(m+1), where m is the strain rate sensitivity of flow stress, have been established and are interpreted on the basis of the dynamic materials model. The as-sintered MMC exhibited a domain of dynamic recrystallization (DRX) with a peak efficiency of about 30% at a temperature of about 500°C and a strain rate of 0.01 s−1. At temperatures below 350°C and in the strain rate range 0.001–0.01 s−1 the MMC exhibited dynamic recovery. The as-sintered MMC was extruded at 500°C using a ram speed of 3 mm s−1 and an extrusion ratio of 10∶1. A processing map was established on the extruded product, and this map showed that the DRX domain had shifted to lower temperature (450°C) and higher strain rate (1 s−1). The optimum temperature and strain rate combination for powder metallurgy billet conditioning are 500°C and 0.01 s−1, and the secondary metal-working on the extruded product may be done at a higher strain rate of 1 s−1 and a lower temperature of 425°C.

Electronic Resource

1573-4803

Springer Online Journal Archives 1860-2000

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

Abstract Metal matrix composites using prealloyed 6061 Al (containing 1% Mg) and elemental blend Al-4 Mg alloys with 10 vol% SiC particulate reinforcements were fabricated using powder metallurgy techniques. The consolidation of the powders was effected by the section rolling process recently developed at the Defence Metallurgical Research Laboratory. This process involves the successive steps of cold isostatic pressing, vacuum sintering and special canning followed by section rolling. This resulted in a high-integrity composite product. An interfacial layer containing magnesium-rich precipitates observed in both the composites is suggested to be the major reason for the low (compared to the value predicted by the rule of mixtures) modulus and strength values in these composites. This layer also appeared to promote interfacial failure at the alloy/SiC interface. The Al-4 Mg alloy, which is known to be non-heat treatable, was found to respond to precipitation hardening heat treatment in the composite. The enhanced generation of dislocations due to the presence of SiC, promoting a more homogeneous precipitation of the second phase and the possibility of an inhomogeneous distribution of magnesium (as a result of elemental blending) are suggested to be the major factors responsible for rendering the Al-4 Mg alloy amenable to the precipitation hardening heat treatment.

Electronic Resource

1618-2650

Best. von Eisen(II), Kobalt(II) mit 7-Nitroso-8-hydroxychinolin-5-sulfonsäure ; Spektralphotometrie

Springer Online Journal Archives 1860-2000

Chemistry and Pharmacology

Electronic Resource