Thioacetamide (TA), a potent centrilobular hepatotoxicant, undergoes a two-step bioactivation mediated by microsomal CYP2E1 to TA sulfoxide (TASO), and further to TA-S,S-dioxide (TASO2), a reactive metabolite that initiates cellular necrosis. Our earlier studies showed that bioactivation-mediated liver injury of TA is not dose-proportional. The objective of this study was to examine whether inc...

There is increasing evidence that androgens play a significant role in the development and progression of breast cancer. 5alpha-Reductase (SRD5A2) is an enzyme that is expressed in androgen-dependent tissues, and it catalyzes the reduction of testosterone to its more bioactive form, dihydrotestosterone, which then transactivates a number of genes. One of these genes encodes for prostate-specifi...

Human JL-calpain is activated maximally by 100-200 JLM Ca2+. Both the 80 kDa and 29 kDa subunits of JL-calpain have a EF-hand type calcium-binding domain. It is known that trivalent terbium ion (Tb3+) mimics Ca2+ in many biological systems. We found that Tb3+ alone transiently activated calpain. However, in the presence of Ca2+ , Tb3+ inhibited JL-calpain with an IC5o of about loo JLM. As high ...

Several transfer RNA precursors which accumulate in a strain of Escherichia coli temperature-sensitive for RNase P have been described. These precursors range from 135 to 690 nucleotides in length. Their tRNA content has been determined by digestion of the precursors to 4 S RNA, followed by Sanger fingerprint analysis of the purified 4 S material. Identification of some of these tRNAs, as well ...

Tenax-TA, a solid-phase sorbent, was used as an alternative to hexadecane for continuous delivery of tetrachloroethene (PCE) to Desulfuromonas strain BB1, a chloro-respiring microorganism. In both batch and bioreactor configurations, Tenax not only maintained low, steady-state concentrations of PCE in an active culture for several months but also adsorbed the product of dechlorination, cis-1,2-...

Does the type of knowledge, and levels of ability and experience needed, depend on rank in managerial accounting? Are the knowledge, ability, and experience needed for managerial accounting success, consistent with the Libby & Luft (L&L) model (1993) of the determinants of judgment performance in accounting? We explore these questions using structural equation models of the performance evaluati...

in vivo microdialysis was used to study the effects of morphine on glutamate release from the ventral tegmentum area (vta) in freely moving rats. intraperitoneal (i.p.) injection of acute and repeated morphine at increasing doses significantly enhanced glutamate release. only a minor tolerance developed to this dosage of morphine. ap-s (2-amino-5-phosphonovaleric acid, 0.5 mg/kg i.p.), a nmda r...

L1 (LINE-1) elements constitute a large family of mammalian retrotransposons that have been replicating and evolving in mammals for more than 100 Myr and now compose 20% or more of the DNA of some mammals. Here, we investigated the evolutionary dynamics of the active human Ta L1 family and found that it arose approximately 4 MYA and subsequently differentiated into two major subfamilies, Ta-0 a...