PubMed Health⌕ Search

Biomedical subjects

M Marchetti

Publications and source records attributed to M Marchetti.

At least 181 records · Page 10Linked to original sources
PubMed1988

True hermaphroditism: diagnosis and surgical treatment.

We documented a new case of 46,XY true hermaphroditism in an 18-year-old patient, reared as a female at birth, with ambiguous genitalia and primary amenorrhea. At laparotomy, bilateral dysgenetic ovotestis containing gonadoblastoma were found. Karyotypes of peripheral lymphocytes and cells from tissue of both gonads were all 46,XY. Plastic surgery was conducted to transform ambiguous genitalia to the full female phenotype. Clitoreduction by glans resection and fastening of the corpora cavernosa in the labia major with enlargement of the vaginal orifice were performed. The results was a small eretcile organ with preserved sensitivity and a female capable of normal sexual activity.

Adolescent↗
PubMed1987

Rapid determination of simazine and atrazine in water at the parts per trillion (10(12) level. Extraction by a miniaturized carbopack B trap followed by high-performance liquid chromatography.

A rapid and simple method for the determination of trace amounts of simazine and atrazine in water is described. A 250-ml volume of water is pre-concentrated by passage at a flow-rate of about 30 ml/min through a small trap containing 50 mg of graphitized carbon black (Carbopack B). After washing with 150 microliters of methanol, the two herbicides are desorbed with 700 microliters of dichloromethane-methanol (60:40, v/v). After removal, of the solvent, the extracted sample is fractionated and analysed by reversed-phase high-performance liquid chromatography with UV detection at 220 nm. A single assay can be completed within 40 min from the receipt of the water sample. Recoveries of simazine and atrazine added to 250 ml of water at the level of 50 ng/l were 97.2 and 95.8% and the limits of detection were 0.07 and 0.15 ng. respectively. At the 50 ng/l level in water, the coefficients of variation for simazine and atrazine were 3.7 and 4.0% (n = 7), respectively.

Atrazine↗
PubMed1987

Liver cytosolic protein-bound folates in phenobarbitone-treated rats.

The effect of acute phenobarbitone treatment on the distribution of endogenous bound folates in three specific cytosolic folate-binding proteins (FBP-C), has been studied in rat liver. The bound folate amount shows no difference between treated and control rats. As it is well known that FBP's preferentially bind longer-chain polyglutamates, the content of which is markedly lower in phenobarbitone-treated rat liver, it might be suggested that shorter chain folates also bind to FBP's in these animals.

Animals↗
PubMed1987

Protein bound folates in liver of castrated rats.

The effect of castration and testosterone treatment on the distribution of [3H] radioactive and endogenous bound folates in hepatic cytosolic folate binding proteins (FBP-C) has been studied in rats. The distribution of [3H] radioactive bound folates in these FBP's shows no significant difference in the three experimental group animals. On the contrary a significant decrease in the amount of endogenous bound folates is observed in castrated if compared with control rats, particularly marked for FBP-CI and FBP-CII bound folates. The testosterone treatment of castrated rats partially restores bound folate levels. The decrease of bound folates in castrated rats might be ascribable to a lower availability of longer-chain forms, almost the ones that bind to FBP's; however lower binding protein content and/or lower affinity for ligands cannot be excluded.

Animals↗
PubMed1987

Folylpolyglutamate synthetase activity in regenerating rat liver.

Regenerating liver of hepatectomized rat showed marked changes in folylpolyglutamate pattern. The activity of folylpolyglutamate synthetase, investigated at various times after the operation, showed a slight increase at 12 h, reached its highest value at 36 h and, for all the time studied, remained at the upper level as compared with controls. These results may contribute to explain the higher incorporation in regenerating liver of 3H folic acid into folylpolyglutamates at a higher number of glutamate residues and is consistent with the hypothesis that the addition of glutamate represents a control step in folate coenzyme synthesis and consequently of one-carbon metabolism.

Animals↗
PubMed1987

Liver folylpolyglutamate synthetase activity in folic acid-deficient rats.

To investigate the influence of folate deficiency on the addition process of glutamyl unit to folylpolyglutamates, liver folylpolyglutamate synthetase was studied. The enzyme activity appears slightly decreased in deficient liver as compared with control. This decline might be more evident in the hepatic cell owing to the lesser availability of reduced forms, preferred substrates of the enzyme.

Animals↗
PubMed1987

Cervical pathology in young patients.

The authors have studied 152 patients aged between 15 and 20 year old who underwent colposcopy and colpocytology. They have compared the incidence of white colposcopic lesions with the results of the cytology. According to literature the results have pointed out that the very young patients are "at risk-patients" for serious cervical lesions and that depistage of gynecologic tumors must be done in all the other women.

Adolescent↗
PubMed1986

Endometrial hormonal receptors as marker of benign breast disease (B.B.D.).

The problem of hormonal treatment of benign disease and mastodynia is still dividing Clinicians and Researchers. The Authors, in order to select the patients suitable to be treated, propose the assay of Estradiol and Progesterone Receptors in the most accessible hormone-dependent tissue: the Endometrium. Author's data point out a quite different behaviour of Estradiol and Progesterone cytoplasmic receptors in the Endometrium of women with B.B.D. and controls. The knowledge of this information in the single patients will release from subjectivity when deciding about B.B.D. therapy or when trying to correct unsatisfactory treatment.

Adult↗
PubMed1985

The time course of [3H]PteGlu uptake and its incorporation into pteroylpolyglutamates in liver of phenobarbitone treated rats.

The uptake of an injected dose of [3H]PteGlu and its incorporation into folate forms in the liver of control and phenobarbitone-treated rats were investigated at a number of time intervals from 1 to 24 h. At 1 h the hepatic uptake of the label was quite similar in both groups of animals and radioactivity was incorporated only in pteroylmonoglutamates. At 6 h label was present also in pteroylpolyglutamate forms and radioactivity values were similar in the two groups. At longer time periods the radioactivity was lower in treated animals than in control ones. The whole data show that phenobarbitone on the one hand does not modify the transport of the vitamin; on the other, it does interfere with "pteroylpolyglutamate synthetase activity".

Animals↗
PubMed1985

Surgery as diagnostic and therapeutic moment in the management of cervical cancer.

Therapeutical program in cervical cancer usually include surgical or radiotherapeutical interventions or a combination of the two, variously integrated with techniques and sequences of application. Treatment planning and evaluation of results are normally based on the classification into clinical stages codified by the FIGO. But this classification, though providing useful prognostic standards of judgement, has proved to be inadequate to identify specific therapeutical guidance. Within a single clinical stage different risk factors have been identified which influence prognosis thus determining the therapeutical treatment more than staging itself. Furthermore clinical staging has failed to predict the surgical stage correctly in a significant number of cases. The index of correction after surgical staging shows discrepancy in about 1/3 of cases. In these cases a therapeutical program based on clinical examination exclusively may prove to be inadequate. The results reported by Authors warrant a rational resort to operative staging in cervical cancer in order to establish the real topography of the original focus more correctly. This indication is further strengthened by the need to identify lymphatic involvement, notably of para-aortic nodes, in locally advanced cases since such an occurrence bears a significant influence on the patient's prognosis and possibility of treatment. On the bases of these considerations the Authors suggest surgery as primary treatment in the management of cervical cancer.

Adult↗
PubMed1985

The uptake of [3H] pteroylglutamic acid into rat liver during regeneration and its incorporation into pteroylpolyglutamates of that organ.

The metabolism of injected [3H] PteGlu in hepatectomized rats was studied. Significantly higher radioactivity was found in all folate derivatives of regenerating liver. The results confirm the hypothesis according to which the decrease of endogenous polyglutamate content of regenerating liver might be ascribed to greater utilization rather than to lower synthesis of these coenzymes.

Animals↗
PubMed1984

Effect of phenobarbitone on folic acid metabolism in the rat.

Anticonvulsant drugs have well-known relationships with folic acid, often leading, in epileptic patients on long term treatment to signs of folic acid deficiency and to haematological complications. The findings of this work, carried out on rats, show strong interference of phenobarbitone with folic acid metabolism, particularly with pteroylpolyglutamate synthesis in liver. This is proved by lower polyglutamate content, lower 3H folate incorporation in polyglutamate forms and in protein-bound folates, and also by lower blood radioactivity, higher urinary excretion of 3H folate metabolites and by higher 3H folate concentration in kidneys.

Animals↗
PubMed1984

Effect of cimetidine on serum carboxyl and aminoterminal fragments of parathyroid hormone in chronic uraemic patients.

The effect of cimetidine on abnormally elevated serum levels of parathyroid hormone was studied in 21 patients with secondary hyperparathyroidism due to chronic renal failure, receiving regular dialysis treatment. The concentrations of carboxyl (-COOH) and aminoterminal (-NH2) fragments of circulating immunoreactive parathyroid hormone (iPTH) were determined before and after 2 months af treatment with cimetidine 400 mg/day. All patients had, on admission, raised levels of either hormonal fragment. The mean pre-treatment value was 17.2 mU/ml for -COOH terminus (upper normal limit 6.5 mU/ml) and 5.7 mU/ml for -NH2 terminus (upper normal limit 1.9 mU/ml). At the end of cimetidine treatment the mean values were 19.9 and 5.7 mU/ml respectively for the two forms of circulating iPTH. No changes in total serum calcium, phosphate or alkaline phosphatase activity were recorded during the study. These results do not indicate any lowering effect of cimetidine on serum iPTH in chronic uraemic patients with secondary hyperparathyroidism.

Adult↗
PubMed1984

Conisation as an important point in the diagnosis and treatment of pre-invasive neoplasy.

110 cases of conisation carried out in the Obstetric and Gynecological Clinic of the University of Padua between 1.1.74 and 31.12.82 have been considered. The operations were always performed on completion of diagnostic assertions comprising colpocytology, colposcopy and biopsy, this last undertaken upon indications from both colposcopic and colpo-cytological examinations. The comparison of the histological sample with the serial on the cone, with the cytological, colposcopical and bioptic ones, correspond in the importance of the lesion in almost 90% of cases. The reliability of the diagnosis by the three methods associated and then integrated by the conisation therefore approaches 100%. Prophylaxis carried out in this way allows a personalisation in the operation which, though respecting radicality, must be as non-demolitary as possible.

Biopsy↗
PubMed1984

The metabolism of [3H] pteroylglutamic acid in rat liver during regeneration after partial hepatectomy.

The rate of [3H] PteGlu uptake and of its incorporation into pteroylpolyglutamate derivatives at different times after label administration, was studied in the regenerating liver of rats 36 hr after partial hepatectomy. While 1 hr after administration of labelled PteGlu the radioactivity levels in regenerating livers are quite similar to controls, they are markedly higher 6, 12, 24 hr after label injection, which is mostly due to the high polyglutamate content. If the regenerating process, on the one hand does not modify the folate uptake rate, it does, on the other, increase the capacity for retaining folates, thanks to a more powerful ability to convert them into pteroylpolyglutamates.

Animals↗