ABSTRACT
Anabolic steroids are abused for performance enhancement by athletes, and for appearance alteration by others. Urine drug testing is an effective deterrent in reducing their abuse. We have reviewed the current status of published information on the urinary metabolites (neutral fraction) of 17 anabolic steroids. The steroids are separated into five groups based on their structures: 17α-methyl steroids, 19-nor steroids, steroids with A-ring modifications, steroids with an extra ring, and steroids with B-ring and C-ring modifications. Common metabolic pathways are noted and summarized.
ABSTRACT
Mass spectrometry in both electron-impact and positive chemical ionisation modes has been used to elucidate the structures of the decomposition products of zopiclone after gas chromatography. A high-performance liquid chromatographic method has been developed for the determination of zopiclone in whole blood. After selective extraction (butyl chloride) the extracts are chromatographed on Spherisorb ODS-5 (5 microns) using dibasic ammonium phosphate-acetonitrile (40:60). The zopiclone is measured by ultraviolet detection with a limit of quantitation of 4 ng/ml. This method has been successfully applied to the determination of zopiclone in post-mortem blood. Zopiclone levels found in five post-mortem cases are presented.
Subject(s)
Chromatography, High Pressure Liquid/methods , Hypnotics and Sedatives/blood , Piperazines/blood , Azabicyclo Compounds , Electrons , Humans , Mass Spectrometry , Postmortem Changes , Reproducibility of Results , Spectrophotometry, UltravioletABSTRACT
The yeast RNA1 gene encodes a cytosolic protein that affects pre-tRNA splicing, pre-rRNA processing, the production of mRNA, and the export of RNA from the nucleus to the cytosol. In an attempt to understand how the RNA1 protein affects such a diverse set of processes, we sought second-site suppressors of a mutation, rna1-1, of the RNA1 locus. Mutations in a single complementation group were obtained. These lesions proved to be in the same gene, SRN1, identified previously in a search for second-site suppressors of mutations that affect the removal of intervening sequences from pre-mRNAs. The SRN1 gene was mapped, cloned, and sequenced. DNA sequence analysis and the phenotype of disruption mutations showed that, surprisingly, SRN1 is identical to HEX2/REG1, a gene that negatively regulates glucose-repressible genes. Interestingly, SRN1 is not a negative regulator of RNA1 at the transcriptional, translational, or protein stability level. However, SRN1 does regulate the level of two newly discovered antigens, p43 and p70, one of which is not glucose repressible. These studies for the first time link RNA processing and carbon catabolite repression.
Subject(s)
Gene Expression Regulation, Fungal , Genes, Fungal , Genes, Regulator , RNA Processing, Post-Transcriptional , Saccharomyces cerevisiae/genetics , Amino Acid Sequence , Base Sequence , Cloning, Molecular , DNA Mutational Analysis , DNA, Fungal/genetics , Genes, Suppressor , Glucose/physiology , Molecular Sequence Data , RNA, Fungal/metabolism , RNA, Messenger/genetics , Repressor Proteins/genetics , Restriction MappingABSTRACT
Eighty-eight survivors of an aircraft accident on the M1 motorway were taken to three major hospitals, two of which were teaching hospitals, in the immediate vicinity. We describe the effects of this on the three blood transfusion and haematology laboratories concerned and on the regional transfusion centre, describe how the work was processed, and list the lessons learnt.
Subject(s)
Accidents, Aviation , Blood Transfusion , Hematology , Laboratories, Hospital , Blood Donors , England , Equipment and Supplies , Hospital Communication Systems , Hospital Departments , Humans , Patient Identification Systems , Specimen Handling/standardsABSTRACT
Since 1983 a large number of small-scale illicit laboratories producing morphine and heroin from commercially available, codeine-based pharmaceutical products have been encountered in New Zealand. The codeine demethylation procedure is based on the use of pyridine hydrochloride. Very simple laboratory equipment and reagents are required and these can be utilised by people with little or no chemical background, following a recipe-like procedure. The process yields a characteristic product known as 'homebake'. This process is fully described.
Subject(s)
Codeine , Forensic Medicine , Heroin , Illicit Drugs , Laboratories , Morphine , Chemical Phenomena , Chemistry , New Zealand , Nonprescription DrugsABSTRACT
A reversed-phase high-performance liquid chromatographic method for the fluorometric determination of morphine in biological samples has been developed. Column effluent is mixed with alkaline potassium ferricyanide to produce the fluorescent dimer pseudomorphine. The method provides higher chromatographic specificity and sensitivity than conventional high-performance liquid chromatography. Morphine can be detected at levels of 10 ng on column.