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Biomedical subjects

A Bianchi

Publications and source records attributed to A Bianchi.

At least 415 records · Page 23Linked to original sources
PubMed1981

Cephalosporins. II. Synthesis and structure-activity relationships of new 7-vinylenethioacetamido and thioacrylamido cephalosporins.

The synthesis and in vitro structure-activity relationships of 7-vinylenethioacetamido and thioacrylamido cephalosporins with various substituents at the 3-position are described. 7(Z)-beta-Vinylenethioacetamido cephalosporins proved the most active against Gram-positive and Gram-negative bacteria. 7-[(Z)-beta-Cyanovinylenethioacetamido]-3-[(1-methyl-1H-tetrazol-5-yl)-thiomethyl]-3-cephem-4-carboxylic acid (K 13101, 40) was several times more active in vitro than cefazolin.

Acrylates↗
PubMed1981

Clinical study of possible interactions between indoprofen and oral anticoagulants.

Possible interactions between indoprofen (IP) and Warfarin Na (W) were studied in 18 patients under chronic anticoagulant treatment, according to a cross-over, double-blind design, comparing 600 mg daily of IP with placebo (PL). In all subjects the dosage of W was kept constant throughout the study (21 days). No significant differences were found between IP and PL either on coagulation parameters or on platelet count and platelet adhesiveness. Afte IP a significant decrease in platelet aggregation (induced by ADP and adrenaline) was observed. The results suggest that indoprofen can be administered to patients under anticoagulant treatment, although frequent checks of the coagulation parameters are advisable in these cases.

Administration, Oral↗
PubMed1980

[Influence of Zn++ and of Mg++ on alkaline phosphatase activity of different origins].

Many researches have shown the role of some bivalent ions on the structure and function of alkaline phosphatase. For this reason we considered interesting to assay the effect of Zn++ and Mg++, at various concentrations, on the activity of alkaline phosphatase (APase) from different sources. The isoenzymes of alkaline phosphatase used for the experiments were from rat kidney and bone, from calf intestinal mucosa and from Escherichia coli. In order to investigate the effect of Zn++ and Mg++ on the enzyme activity, the two ions were removed using EDTA as chelating agent. The residual enzymatic activity was measured after having preincubated for 15 min the enzyme with EDTA at a final concentration of 0.05 mM, 0.1 mM, 0.5 mM, 5 mM, 25 mM. The reactivation of the enzyme was studied using as reference a sample, in which the final concentration of EDTA was 5 mM. In these series of experiments the enzymatic activity was assayed after a preincubation of the reaction mixture with ZnCl2 10 mM, MgCl2 10 mM and ZnCl2 +MgCl2 10 mM. The inactivation in the time of the enzyme by 5 mM EDTA was also studied. The results obtained show that APase from intestinal mucosa maintained, at the lower concentrations of EDTA (0.05, 0.1 and 0.5 mM), a residual activity higher than that of the enzymes of other source. Moreover, whilst the activity of the mucosal enzyme was completely restored by the addition of Zn++, the complete reactivation of the other enzyme activities was obtained only by the addition of Zn++ and Mg++ together. Concerning the inactivation by EDTA during the time, it was shown that APase from calf intestinal mucosa was inactivated after 60 min of incubation, while the enzymes from other sources lost completely their activity after 10 min.

Alkaline Phosphatase↗
PubMed1980

Intestinal loop lengthening--a technique for increasing small intestinal length.

A reproducible technique is described for doubling the length of a loop of small intestine, while simultaneously reducing its luminal diameter, and preserving the maximum amount of small bowel mucosa for intestinal adaptation. In pig experiments, 7 loops have been increased in length by the "intestinal loop lengthening" procedure, with survival of 5 of the 7 animals for a period of 16-26 wk. Leakage from the lengthened intestinal segment led to the death of one animal. At a second operation, or at termination of the experiment, all seven lengthened loops had a good blood supply and were patent along their full length. Histologic examination of 3 of the 4 specimens from the first phase of the study confirmed their viability. The potential application of intestinal loop lengthening in the management of the short gut syndrome is discussed.

Animals↗
PubMed1980

Purification of phytase from rat intestinal mucosa.

Phytase has been purified from intestinal mucosa of rats fed on a phytic acid-enriched diet. The purification consisted of four steps: homogenate preparation, ultrafiltration procedure, DEAE cellulose chromatography, and Sephadex G-100 chromatography. The enzyme was purified 828-fold, as can be seen from the polyacrylamide gel electrophoresis pattern.

6-Phytase↗
PubMed1979

[Influence in vivo of sorbitol on sorbitol dehydrogenase activity].

Previous researches carried out on the metabolism of sorbitol in the rat showed the influence of this polyalcohol on the activity of some dehydrogenases NAD and NADP-dependent and on lacate/pyruvate, NADH/NAD and NADPH/NADP ratios. Since sorbitol dehydrogenase (SDH, EC 1.1.1.14) is an enzyme with a great affinity for sorbitol, it seemed interesting to investigate the effect of a sorbitol-enriched diet on SDH activity in the rat liver after different periods of dietary treatment (20, 40, 60 days). SDH was assayed by a continuous optical test according to Bücher et al. The data obtained show a repressive action on SDH activity by a sorbitol-enriched diet. In fact, whilst after 20 days of treatment SDH activity decreased of about 18% in respect of the controls, after 60 days a decrease of 80% was observed. This result is so interesting to stimulate other investigations in vitro on the kinetics of such metabolic reaction in the attempt to explain the relation between the enzyme and its substrate.

Animals↗
PubMed1979

[Development of bacterial populations of telluric, enteric, and marine origin in planktonic systems exposed to urban pollution; mathematical data analysis].

A study of the comparative distribution of different types of bacterial populations in the sea area where the city of Marseille rejects its waste water shows that, when in contact with the marine environment, a great part of the allochthonic bacterial population undergoes physiological stress expressed by an abrupt reduction of the effectives and by weak values of the energetic charge. The presence of coliforms and streptococci in waste water lens, at important distances from discharging conduits, shows the possibility of a large diffusion for a fraction of the bacterial populations that withstand the initial stress. From mathematical analyses, an inverse correlation is revealed between detergents and the bacterial population as a whole, and between phenols and various allochthonic bacterial populations. The above results were evidenced through a sampling strategy based upon a 24-h-cycle study and a search for mathematical correlations between several biological, chemical, and physical parameters.

Adenosine Triphosphate↗