The goal of this study was to determine whether the stress of forced exercise would result in injury to the myocardium. Male rats with 8% of body weight attached to the tail were forced to swim 3.5 h (3.5S), forced to swim 5 h (5S), or pretrained for 8 days and then forced to swim 5 h (T5S). Rats were killed immediately after they swam (0 h PS) and at 3 h (3 h PS), 24 h (24 h PS), and 48 h afte...

4-Methylaminorex is a stimulant drug of abuse that exists as four stereoisomers: cis-4R,5S, cis-4S,5R, trans-4S,5S, and trans-4R,5R. These isomers have previously been shown to differ markedly in various respects. In the present study we assessed the effects of the isomers of 4-methylaminorex (2.5, 5.0, and 10 mg/kg i.p.) on extracellular dopamine and 5-hydroxytryptamine (5-HT) levels in the nu...

Ribosomal RNAs (rRNAs) are transcribed from two multicopy DNA arrays: the 5S ribosomal DNA (rDNA) array residing in a single human autosome and the 45S rDNA array residing in five human autosomes. The arrays are among the most variable segments of the genome, exhibit concerted copy number variation (cCNV), encode essential components of the ribosome, and modulate global gene expression. Here we...

The organization of the 5s rRNA genes in the MACronuclear genome of Tetrahymena thermophila was examined during MAC development and replication. The 5s genes are arranged in several tandem arrays of alternating transcribed and spacer sequences in both MICronucleus and MAC. The number of EcoRI fragments bearing 5s gene clusters is similar in MIC and MAC. Most fragments occur in both the MIC and ...

ramethylchroman-2-ylmethoxy)benzyl]-2,4-dioxothiazollidine, troglitazone, is a mixture of two racemic diasteromers, the (±)(2R*,5S*) and (±)-(2R*,5R*) diastereomers. The molecular and crystal structures of both diastereomers have been reported.1,2 Slow crystallization of troglitazone with an aqueous acetone solution gave dihydrated single crystals that were different from the reported diastereo...

The strong-field many-electron dynamics is studied via the resonance-enhanced high-order harmonic generation (HHG) of niobium. In intense IR lights excited states Nb with configuration $4{d}^{3}5s\phantom{\rule{0.16em}{0ex}}np$ play a vital role in enhanced HHG below ionization potential, even though electron initially occupying $5s$ orbital most active. energies these increase linearly laser i...

Simian virus 40 (SV40) large tumor antigen (T antigen) exists in multiple molecular forms, some of which are separable by zone velocity sedimentation of soluble extracts from infected monkey cells. Three subclasses of this antigen from SV40-infected monkey cells have been separated and characterized: the 5S, 7S, and 14S forms. Newly synthesized T antigen occurs primarily in the 5S form. Chemica...

5,6-dihydroxy-5,6-dihydrothymidine (thymidine glycol) is a major product of the reaction of thymidine with reactive oxygen species, including those generated by ionizing radiation. Thymidine glycol exists as 2 diastereomeric pairs by virtue of the chirality of the C(5) and C(6) atoms. A simple procedure is described for synthesizing and purifying each of the diastereomeric pairs separately. Aft...

A method for the isolation of structural genes, whose transcripts do not contain terminal poly(A) sequences, is presented. Poly(A) tails of predicted length were synthesized at the 3'-OH ends of RNA molecules employing Escherichia coli ATP : RNA adenyltransferase (EC 2.7.7.19). The gene isolation was performed in two steps: (a) enrichment of DNA fragments carrying the genes of interest, (b) sub...