for a fixed positive integer , we say a ring with identity is n-generalized right principally quasi-baer, if for any principal right ideal of , the right annihilator of is generated by an idempotent. this class of rings includes the right principally quasi-baer rings and hence all prime rings. a certain n-generalized principally quasi-baer subring of the matrix ring are studied, and connections...

Numerous additives are used in the electrolytes of lithium-ion batteries, especially for formation an efficient solid electrolyte interphase at surface electrodes. Understanding degradation processes these compounds is thus important; they can be seen through radiolysis. In case fluoroethylene carbonate (FEC), picosecond pulse radiolysis experiments evidenced FEC.- . This radical stabilized nea...

Natural abundance 13C NMR spectroscopy at 63.4 kG was used to probe the temperature dependence of lipid dynamics in low density lipoproteins (LDL) and in aortic fibrous plaques (i&ma-media sections). Spectra of LDL from normals and a familial type II were essentially indistinguishable. At 37”C, tissue spectra exhibit numerous narrow fatty acid and cholesteryl ester ring resonances, no peaks att...

In this work, 5-mercapto-1-methyltetrazole was studied by low temperature matrix-isolation and solid-state infrared spectroscopy, DFT(B3LYP)/6-311CCG(d,p) calculations and photochemical methods. In the low temperature neat solid phase and isolated in an argon matrix, the compound was found to exist in the 1-methyl-1,4-dihydro-5H-tetrazole-5-thione tautomeric form. The infrared spectra of the co...

A pathogen is usually defined as a microorganism that causes, or can cause, disease. We have defined a pathogen as a microbe that can cause damage in a host. However, this definition immediately raises the question of what it is about the microorganism that enables it to cause disease or damage; and this takes us to an ongoing debate that dates back to the late 19th century when the germ theory...