Studies on tumour inhibitory activity of indigenous drugs: Part I. Tumour inhibitory activity of Hippophae salicifolia, D.DON

The extracts of the bark of Hippophae salicifolia D.DON have been found to possess significant inhibitory activity on mouse fibrosarcoma. The tumour tissues showed that there was a degeneration and even necrosis of tumour calls. The alcoholic extract (B) of the bark also possesses an inhibitory activity against Yoshida sarcoma (ascites), as evidenced by the increase in survival period of the experimental animals. The chemistry of the bark is under investigation

Magnetic Structure in Fe/Sm-Co Exchange Spring Bilayers with Intermixed Interfaces

The depth profile of the intrinsic magnetic properties in an Fe/Sm-Co bilayer fabricated under nearly optimal spring-magnet conditions was determined by complementary studies of polarized neutron reflectometry and micromagnetic simulations. We found that at the Fe/Sm-Co interface the magnetic properties change gradually at the length scale of 8 nm. In this intermixed interfacial region, the saturation magnetization and magnetic anisotropy are lower and the exchange stiffness is higher than values estimated from the model based on a mixture of Fe and Sm-Co phases. Therefore, the intermixed interface yields superior exchange coupling between the Fe and Sm-Co layers, but at the cost of average magnetization.Comment: 16 pages, 6 figures and 1 tabl

New chemical constituents in tobacco

New chemical constituents in a variety of Indian tobacco (N. tabacum) have been isolated by means of chromatography on alumina. The separation of four steryl glycosides, four sterols, one ketosteroid and nine waxy compounds have been reported in this paper. Attempts have been made to elucidate the chemistry of all these products

Metabolism of thiosters of carcinogenic hydrocarbons. Part : Metabolism of dibenzothiophene

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In situ polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source Related Articles In situ polarized 3 He system for the Magnetism Reflectometer at the Spallation Neutron Source

Novel mono-static arrangement of the ASDEX Upgrade high field side reflectometers compatible with electron cyclotron resonance heating stray radiation Rev. Sci. Instrum. 83, 10E317 (2012) Density profile measurements with X-mode lower cut-off reflectometry in ASDEX Upgrade Rev. Sci. Instrum. 83, 10E315 (2012) First results of the SOL reflectometer on Alcator C-Mod Rev. Sci. Instrum. 83, 10E309 (2012) Metamaterial near-field sensor for deep-subwavelength thickness measurements and sensitive refractometry in the terahertz frequency range Appl. Phys. Lett. 100, 221101 (2012) High-pressure cell for neutron reflectometry of supercritical and subcritical fluids at solid interfaces Rev. Sci. Instrum. 83, 045108 (2012) Additional information on Rev. Sci. Instrum. We report on the in situ polarized 3 He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer at the Spallation Neutron Source at Oak Ridge National Laboratory. Using the spin exchange optical pumping method, we achieved a 3 He polarization of 76% ± 1% and maintained it for the entire three-day duration of the test experiment. Based on transmission measurements with unpolarized neutrons, we show that the average analyzing efficiency of the 3 He system is 98% for the neutron wavelength band of 2-5 Å. Using a highly polarized incident neutron beam produced by a supermirror bender polarizer, we obtained a flipping ratio of >100 with a transmission of 25% for polarized neutrons, averaged over the wavelength band of 2-5 Å. After the cell was depolarized for transmission measurements, it was reproducibly polarized and this performance was maintained for three weeks. A high quality polarization analysis experiment was performed on a reference sample of Fe/Cr multilayer with strong spin-flip off-specular scattering. Using a combination of the position sensitive detector, time-of-flight method, and the excellent parameters of the 3 He cell, the polarization analysis of the two-dimensional maps of reflected, refracted, and off-specular scattered intensity above and below the horizon were obtained, simultaneously. [http://d