NOPR Collection:

Effect of capsicum annum on the inhibition of growth of cholesterol crystals

Tue, 01 Jun 2004 00:00:00 GMT

Title: Effect of capsicum annum on the inhibition of growth of cholesterol crystals Authors: George, Thomas T; Pillai, K Mohanan Abstract: Cholesterol is a well-known lipid found in atherosclerotic plaques. Crystals of cholesterol were grown by single diffusion gel growth technique. The inhibitory role of capsicum annum on the growth of cholesterol crystals is reported. The extract incorporated in the gel has considerable role in the reduction of nucleation centers and in inhibiting the growth of cholesterol crystals. Page(s): 465-466

Studies on fluid structure and molecular interactions of amides

Tue, 01 Jun 2004 00:00:00 GMT

Title: Studies on fluid structure and molecular interactions of amides Authors: Thenappan, T; Sankar, U Abstract: Fluid structure in amides could be readily studied by dielectric measurements by virtue of the influence of local order and the overall dipole moment. The short-range interactions between permanent dipoles could be described by the Kirkwood-Frohlich correlation factor. In dilute solutions of amides with inert solvents, the interaction between the solute species among themselves may be given by the modified form of the correlation factor (g') by taking care of solvent- solvent interaction. The dielectric constants of the binary mixtures of acrylamide, acetamide, benzamide and pthalimide in 1,4-dioxan were measured at 298, 308 and 318 K. The results were interpreted in the light of the theory. The nature of interaction was identified in all systems. Page(s): 435-439

Excitation and ionization of laser-pumped potassium vapour

Tue, 01 Jun 2004 00:00:00 GMT

Title: Excitation and ionization of laser-pumped potassium vapour Authors: Mahmoud, M A Abstract: The excitation and ionization of low dense K vapur (n_o10¹⁴ cm ^-3) by resonant cw laser radiation (I10³w. cm^-2) have been studied theoretically and the processes responsible for the transfer of energy from the laser -excited atoms into ionization have been presented. It has been established that seed electrons created by collisional ionization processes were heated in superelastic collisions with laser excited atoms, and subsequent electron - impact excitation and ionization as well as Penning ionization of high lying levels lead to the creation of more electrons. Page(s): 429-434

High spectral purity cavity stabilized microwave oscillators

Tue, 01 Jun 2004 00:00:00 GMT

Title: High spectral purity cavity stabilized microwave oscillators Authors: Gupta, A Sen Abstract: Low noise microwave oscillators and novel techniques of reducing the close in noise in these oscillators by using a high Q cavity as a frequency discriminator have been presented. In essence the discriminator converts noiseinduced frequency fluctuations into corresponding phase variations of a signal reflected from it. An accurate model for the noise floor of the cavity discriminator has been described. The noise cancellation depends on factors such as— the cavity Q, microwave power into the cavity, the input coupling coefficient and the level of carrier suppression. Experimental results indicate reasonably good agreement with the model. Page(s): 459-464