Search PubMed⌕ Search

Biomedical subjects

D Charles

Publications and source records attributed to D Charles.

At least 73 records · Page 4Linked to original sources
PubMed1980

Urinary tract infections in the female.

Special problems peculiar to urinary tract infections (UTIs) in the female include higher frequency than in males, recurrent infections, restrictions on antibiotic use during pregnancy, and the "urethral syndrome." Current concepts in the management of UTI include recognition of significant infection with total count of less than 100,000 organisms per milliliter; awareness that untreated UTI usually does not lead to progressive renal failure; importance of differentiating between upper and lower UTI; use of antibody coating of bacterial for distinguishing upper from lower UTI; evidence that 1-day (or single-dose) therapy may be adequate for cystitis, whereas pyelonephritis usually requires treatment beyond 2 weeks; evidence of effective prophylaxis; and indications that Chlamydia may be responsible for some cases of urethral syndrome.

Adolescent↗
PubMed1980

Holistic medicine.

Explore the source record for details and available documents.

Ambulatory Care Facilities↗
PubMed1979

Biochemical analyses of natural and induced null variants of Drosophila enzymes.

For the characterization of null mutants identified in Drosophila populations, several Drosophila enzymes including alcohol dehydrogenase, cytoplasmic malate dehydrogenase, alpha-glycerol phosphate dehydrogenase, and phosphoglucose isomerase were co-purified to homogeneity using an 8-(6-aminohexyl)-amino-ATP-Sepharose affinity column followed by DEAE-Sepharose column chromatography. Mitochondrial malate dehydrogenase was purified by the use of CM-Sepharose and the same ATP affinity column. Alcohol dehydrogenase and alpha-glycerol phosphate dehydrogenase were mapped on a two-dimensional gel. Antiserum was raised in rabbits against these Drosophila enzymes. The presence of cross-reacting material in null mutants was characterized by double immunodiffusion, immunoelectrophoresis, and two-dimensional gel electrophoresis. By immunological techniques, two natural null variants of malic enzyme and one of phosphoglucose isomerase were shown to be negative to cross-reacting material. Two low-dose-rate gamma-radiation-induced null mutants of cytoplasmic malate dehydrogenase were shown to be positive to cross-reacting material. Two-dimensional gel analyses enabled the characterization of three natural null variants of alpha-glycerol phosphate dehydrogenase. The viability of some null mutants with homozygous null or null/deficiency genotypes is discussed in terms of the in vivo metabolic roles of the related enzymes.

Alcohol Oxidoreductases↗
PubMed1979

Analyses of mouse and Drosophila proteins by two-dimensional gel electrophoresis.

Two-dimensional gel electrophoresis was employed for the protein analysis of several different mouse tissues and Drosophila. The number of protein spots detected with conventional protein dye staining techniques ranged from 110 in erythrocyte lysate to 320 in liver homogenate. Strain variation of protein spots on the gels was examined in five different tissues from two strains of inbred mice (DBA/2J and C57BL/6J) and their F1 hybrids. The protein spots which exhibited strain variation were shown to be autosomally inherited and to follow Mendelian genetics. From these analyses, it was shown that the frequencies of protein variations between these two strains of mice vary from 1 to 5% with the tissue examined. During the course of this study, the protein spots corresponding to nine muscle proteins and three testis enzymes from the mouse as well as two Drosophila enzymes were assigned on two-dimensional gels of their respective homogenates. Radioisotope labelling of Drosophila and autoradiography of the two-dimensional gels were also performed to improve the sensitivity and resolution of the technique. The potential application of two-dimensional gel electrophoresis for mutant screening as well as biochemical genetic studies is discussed.

Animals↗
PubMed1979

Iridocyclectomy technique and results.

The technique and results of 30 iridocyclectomies performed by the senior author are reviewed. Although the total number of cases is small for statistical purposes, its main value is that all the operations were performed by one surgeon, which means a uniform criteria for the indications, surgical technique, management of complications, immediate and postoperative decisions, follow-up control, and direct discussion of the histopathology with the pathologist. Three techniques were used: (1) routine excision only of uveal tissue in 15 cases, (2) cyclectomy, ie, plus excision of deep scleral wall in four cases, and (3) block excisions of cornea, sclera, affected iris, and ciliary body followed by a reconstructive penetrating graft in 11 cases. Twenty-one cases were melanocytoma; one, metastatic tumor; one, nevus; two, cysts; and three, foreign body granulomas. Prognostic features such as cell type, largest diameter above 10 mm, tumor thickness, tumor at edge, iris or ciliary body origin, location, and preoperative glaucoma are discussed, and some practical conclusions are advanced. The follow-up control for 21 melanoma cases in the series is five to ten years or more in 11 cases and up to four years in ten cases. The visual results are also analyzed.

Adult↗
PubMed1979

Deuterium-labeled steroids for study in humans. II. Preliminary studies on estrogen production rates in pre- and post-menopausal women.

6,7-Dideuterio-3-hydroxy-1,3,5(10)-estratrien-17-one (dideuterio-estrone) and 4-deuterio-1,3,5(10)-estratriene-3,17 beta-diol (monodeuterio-17 beta-estradiol) were used for the estimation of estrogen production rates in pre- and post-menopausal women. The results are concordant with those obtained by radioisotope administration as reported in the literature. This preliminary study suggests that one or more steroids labeled with one or multiple deuterium and/or other stable isotopes may be employed for the measurement of production rates of steroid hormones which are derived from multiple precursors.

Adult↗
PubMed1979

Cerebral abscess associated with an intrauterine contraceptive device.

The present communication is the first report of a metastatic brain abscess occurring as a complication of severe intrauterine device (IUD)-related pelvic inflammatory disease (PID). The diagnostic and therapeutic problems are discussed, and a suggestion is made for the reporting of all IUD-associated infections to a central agency.

Anti-Bacterial Agents↗
PubMed1977

Stable long-term recordings from cat peripheral nerves.

A procedure has been developed for the stable long-term recording of nerve signals in unanesthetized mammals, which should have wide application in basic research on the nervous system and also in clinical areas such as the derivation of control signals for powered prostheses. Methods are fully described for constructing devices consisting of (1) Silastic nerve cuffs containing three or more electrodes, (2) coiled leads insulated with Silastic which extend from the cuffs to an integrated circuit socket, (3) a vitreous carbon transcutaneous connector which surrounds the integrated circuit socket and makes a good interface with the skin. Neural activity has been recorded from mammalian nerves for many months during normal behaviour. The peak-to-peak amplitude and latency of the recorded compound action potentials remain stable and may continue at a constant level more or less indefinitely. A tripolar recording configuration between a central lead and the two end leads, which are connected together, permits good rejection of EMG signals from surrounding muscles. The amplitude of single unit potentials increases as the square of the conduction velocity of the nerve fibre. Thus, the largest nerve fibres will dominate the signals recorded during behaviour. The reasons for premature termination of a few experiments are given together with methods for overcoming these problems. For example, platinum-iridium electrodes remain relatively stable, whereas silver wires tend to fracture after being in an animal for several months. This and other relationships are discussed which permit an optimal design of nerve cuffs for a given recording situation.

Action Potentials↗
PubMed1976

The significance of urinary free cortisol and progesterone in normal and anencephalic pregnancy.

Urinary free cortisol and progesterone were determined by radioimmunoassay in 18 normal and 16 anencephalic pregnancies and urinary free cortisol levels in 9 nonpregnant women. In normal pregnancy the urinary free cortisol (46.89 +/- 34.02 mug per 24 hours) was significantly higher (P less than 0.001) than that found with anencephaly (17.19 +/- 13.20 mug per 24 hours) and 2 1/2 times (P less than 0.001) the nonpregnant value (18.47 +/- 5.44 mug per 24 hours). In 12 of the anencephalic pregnancies, urinary free cortisol levels (11.05 +/- 5.56 mug per 24 hours) were significantly lower than in nonpregnant women (P less than 0.001). Urinary progesterone levels in normal pregnancy (15.57 +/- 9.66 mug per 24 hours) and anencephaly (18.54 +/- 12.69 mug per 24 hours) were comparable. The cortisol excretion values associated with anencephaly indicate that the normal fetus contributes substantially to the maternal plasma cortisol pool. Urinary free cortisol determinations may be a useful index of fetal adrenal dysfunction.

Adrenal Glands↗