Comment on "Relativistic extension of shape-invariant potentials"

This comment directs attention to some fails of the Alhaidari approach to solve relativistic problems. It is shown that his gauge considerations are way off the mark and that the class of exactly solvable relativistic problems is not so enlarged as Alhaidari thinks it is

S-Matrix on the Moyal Plane: Locality versus Lorentz Invariance

Twisted quantum field theories on the Groenewold-Moyal plane are known to be non-local. Despite this non-locality, it is possible to define a generalized notion of causality. We show that interacting quantum field theories that involve only couplings between matter fields, or between matter fields and minimally coupled U(1) gauge fields are causal in this sense. On the other hand, interactions between matter fields and non-abelian gauge fields violate this generalized causality. We derive the modified Feynman rules emergent from these features. They imply that interactions of matter with non-abelian gauge fields are not Lorentz- and CPT-invariant.Comment: 15 pages, LaTeX, 1 figur

Relativistic Green functions in a plane wave gravitational background

We consider a massive relativistic particle in the background of a gravitational plane wave. The corresponding Green functions for both spinless and spin 1/2 cases, previously computed by A. Barducci and R. Giachetti \cite{Barducci3}, are reobtained here by alternative methods, as for example, the Fock-Schwinger proper-time method and the algebraic method. In analogy to the electromagnetic case, we show that for a gravitational plane wave background a semiclassical approach is also sufficient to provide the exact result, though the lagrangian involved is far from being a quadratic one.Comment: Last paper by Professor Arvind Narayan Vaidya, 18 pages, no figure

Antioxidant Capacity of Fresh and Dry Leaf Extracts of Sixteen Scutellaria Species

The antioxidant capacity of 16 Scutellaria species was examined using Trolox equivalent antioxidant capacity (TEAC) assay. Total polyphenol, antioxidant capacity estimation and flavonoid content measurements were conducted on fresh and air dried leaf extracts. The highest total polyphenol content was obtained in dry leaf extracts of S. ocmulgee at 732.41 67 mg/g of gallic acid equivalent. Dry leaf extracts of S. ocmulgee registered 2480.93 μmol/g of Trolox equivalent antioxidant capacity and the highest total flavonoid content with 200.63 μg/mL from fresh leaf extracts of S. alpina. Rosemary (Rosmarinus officinalis), a common herb with known high antioxidant potential, was used as a standard for comparison with the Scutellaria species