[Cerebrospinal-fluid affinity of cefoxitin].
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Adult↗
Biomedical subjects
J Berlin
Publications and source records attributed to J Berlin.
5-Methyltryptophan resistant cells of Catharanthus roseus.
Several cell lines resistant to 5-methyltryptophan were selected from wild type cells of different Catharanthus roseus suspension cultures. The resistant cells had up to 30 times the normal levels of free tryptophan. Despite the increased pool size of tryptophan anthranilate synthetase activity of resistant cells was as sensitive to inhibition by L-tryptophan as wild type cells. The overproduction of tryptophan did not lead to intensified accumulation of tryptamine nor of indole alkaloids. This was supported by a low conversion of tryptophan to tryptamine in vivo and in vitro. The overproduction of one of the primary precursors was evidently not sufficient to stimulate the rate of indole alkaloid synthesis in Catharanthus cells.
Anthranilate Synthase↗
[The sedative and amnesic effects of flunitrazepam during regional anaesthesia (author's transl)].
The sedative, hypnotic and amnesic effects of flunitrazepam, a new benzodiazepine, were tested in doses of 0 (placebo), 0,4 mg and 0,8 mg. These doses were sufficient to produce a satisfying sedative effect on patients, being operated on in regional anaesthesia. In few cases we found undesirable effects. Positive and negative aspects of amnesia will be discussed.
Adult↗
[Naloxone reversal of fentanyl anaesthesia in major vascular surgery (author's transl)].
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Anesthesia, General↗
Elective hysterectomy.
Hysterectomy is the most frequently performed major operation. Its frequency is increasing due to greater use of elective indications such as uterine cancer prophylaxis, contraception, and menopausal problems. The effects of elective simple hysterectomy are evaluated in terms of morbidity and mortality rates and costs. Among 35-year-old women operated upon, the average over-all gain in life expectancy is only 0.2 years. This is due to the saving of 1.3 per cent of women who would have died from cancer of the cervix or endometrium; they gained 14.3 years of life. In addition, 3 per cent of women are spared the development of and treatment for these two conditions. All women operated upon would be relieved of some undesirable aspects of the menopausal years such as irregular uterine bleeding. There are also economic gains. However, the operation has adverse health effects which could offset any gains from cancer prevention. In addition, each year of life saved would cost about $12,800 and most of the added years would be lived in old age. Delaying the operation to age 45 and including oophorectomy would result in a lower cost per year of life saved-about $9,800-but the risk of adverse health effects probably would be increased very much. Cancer prophylaxis cannot justify elective hysterectomy; we cannot assess whether quality-of-life considerations do.
Adult↗
An epidemic of pediculosis capitis.
An epidemic due to Pediculus humanus capitis occurred in the public schools of Buffalo, New York, in the winter of 1973. A survey at one elementary school showed that 20% of whites and no blacks were infested, and a city-wide prevalence survey during the academic year September 1972 to May 1973 showed that 7.2% of all pupils were infested. An epidemiological investigation showed that sex, age, race, socioeconomic status, crowding, method of closeting garments, and family size influenced the distribution of pediculosis but that hair length apparently was not a factor. Poverty and ignorance appeared to contribute to the persistence of infestation.
Adolescent↗
Oxidative decarboxylation of para-hydroxybenzoic acids by peroxidases under in vivo and in vitro conditions.
Oxidative decarbyxylation of p-hydroxybenzoic acids in plant cell suspension cultures is catalyzed by peroxidases. This reaction has been characterized in vivo and in vitro. Decarboxylation of substituted benzoic acids yields monomeric, dimeric and oligomeric benzoquinones. All peroxidases obtained from soybean (Glycine max) cell suspension cultures by gel electrophoresis are equally capable to decarboxylate p-hydroxygenzoic acids as indicated by their rather low differences in specific activity for various benzoic acids.
Decarboxylation↗
Amino acid uptake by amino acid analog resistant tobacco cell lines.
Two tobacco cell lines resistant to p-fluorophenylalanine (PFP) and one resistant to 5-methyltryptophan (5-MT) are compared with wild type cells in their ability to absorb amino acids from the medium. One p-fluorophenylalanine-resistant cell line shows greatly reduced uptake of all amino acids so is resistant to growth inhibition by other amino acid analogs. The impaired absorption is noted with amino acids, amino acid analogs and shikimate, but not with cinnamate, salicylate, nicotine, glucose, 3-O-methylglucose and palmitate. The phenylalanine transport system of the PFP-resistant cell line and the wild type both have Km values of 90 micrograms, but have different Vmax values. Several analogs of phenylalanine and several neutral L-amino acids inihibt the phenylalanine transport system, while L-aspartic acid, L-arginine, D-phenylalanine or chlorogenic acid do not interfere with the L-phenylalanine uptake. The results indicate the presence of more than one transport system for amino acid uptake. The lessened uptake of all amino acids, the specificity of the uptake systems and the unchanged binding let us conclude that a pleiotropic mutation or that some inhibitor causes the reduced uptake of all amino acids by the PFP-resistant cell line.
Amino Acids↗
Evidence for distinct amino acid transport systems in cultured tobacco cells.
It is shown by competition experiments that tobacco cell lines have distinct transport systems for L-amino acids. For all tested amino acids the Lineweaver-Burk plots were diphasic indicating the presence of more than one carrier for any one amino acid. Moreover distinct transport systems for neutral, acidic and basic amino acids were kinetically characterized. Based on competition experiments neutral amino acids were absorbed by all transport systems. Aspartic acid entered the cells via its own carrier and via the basic carrier while arginine was taken up only by the basic carrier. Neutral amino acids such as L-leucine or L-phenylalanine were taken up faster than acidic or basic amino acids.
Alanine↗
Effects of alpha-aminooxy-beta-phenylpropionic acid on phenylalanine metabolism in p-fluorophenylalanine sensitive and resistant tobacco cells.
A p-fluorophenylalanine (PFP) resistant cell line with high phenylalanine ammonia lyase (PAL) activity and wild type cells with low PAL activity were compared in their responses to PAL inhibition by alpha-aminooxy-beta-phenylpropionic acid (AOP). Inhibition of PAL reduced the levels of the main phenolic compounds to 30% of the controls. Free phenylalanine pools increased 17 fold in the resistant line and 6 fold in the sensitive line, respectively. The accumulation of phenylalanine did not reduce the flow of labeled shikimic acid into the aromatic amino acids tyrosine and phenylalanine. The results are discussed with respect to the feedback inhibition of chorismate mutase activity by phenylalanine and tyrosine in both cell lines.
Ammonia-Lyases↗