Coulomb-nuclear potential resonances for oscillatory structure in second energy derivative of fusion cross section times energy

In a nucleus-nucleus collision, resonances depicted by larger values of reaction cross section (σ R) at specific energies are generated by the combined Coulomb-nuclear potential by virtue of well-developed pocket in it. The generation of such resonance is ascertained by the peak value of phase-shift time or dwell time at the resonance energy. We extract the results of fusion cross section (σ F) from σ R in the presence of such resonances and present them in the form of a quantity D F(E) = (d2(Eσ F)/dE 2): the second energy derivative of the product of σ F and energy E. In principle the variation of the quantity D F(E) as a function of energy shows two peaks and a negative dip between them around each resonance energy stated above. There can be several resonances in a given angular momentum trajectory denoted by partial wave ℓ. Hence each ℓ would carry a number of peaks and dips for the result of D F(E) over a range of energy. These results of D F(E) from a large number of ℓs involved in a heavy-ion collision shall be added together and, after some mutual cancellation and/or addition, the final result of D F(E) will show an oscillatory structure with a large number of residual peaks and dips present over the range of energy of variation. These calculated results of D F(E) give successful explanation of the corresponding results extracted from the experimental results of σ F at different energies in the cases of heavy-ion system of reactions, namely 16O + 208Pb, 36S + 110Pd, 58Ni + 60Ni and thereby it is confirmed that peaks and dips found in the variation of D F(E) extracted from the measured results of σ F as a function of the energy are critically influenced by the potential pocket resonances generated in the reactions

A Minor Acylated Triterpenoid Saponin from the Seeds of Pithecellobium dulce

A novel acylated triterpenoid saponin, designated pithecelloside, is isolated from the seeds of Pithecellobium dulce and characterised as 3-O-[a-L-arabinopyranosyl-(1 ! 2)-a-L-arabinopyranosyl-(1 ! 6�-b-D-glucopyranosyl]- 21b-O-[(20E)-60-hydroxy-20,60-dimethylocta-20,70-dienoyl]acacic acid 1

Woodfordia Fruticosa: Traditional Uses and Recent Findings

Woodfordia fruticosa Kurz of the family Lythraceae is a plant of tropical and subtropical region with a long history of medicinal use. A wide range of chemical compounds including tannins (especially those of macrocyclic hydrolysable class), flavonoids, anthraquinone glycosides, and polyphenols have been isolated from this species in recent times. Extracts and metabolites of this plant, particularly those from flowers and leaves, possess useful pharmacological activities. A comprehensive account of the chemical constituents and the biological activities is presented and a critical appraisal of the ethnopharmacological issues is included in view of the many recent findings of importance on this plant