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Biomedical subjects

S Riva

Publications and source records attributed to S Riva.

160 records · Page 9Linked to original sources
PubMed1968

Relationship between competence for transfection and for transformation.

Deoxyribonucleic acid (DNA) extracted from phage SPP1 is highly infectious on Bacillus subtilis competent cells; the efficiency of infection is 5 x 10(3) to 6 x 10(3) phage equivalents per plaque-forming unit. This DNA was used to study the relationship between competence for transfection and for transformation. The experiments were concerned with the frequency of infection and transformation in mutants exhibiting different levels of competence, the effect of periodate on competence for infection and for transformation, the competition between phage and bacterial DNA, the transformation of cells preinfected with phage DNA, and the infection of cells pretreated with bacterial DNA. The data show that B. subtilis cells competent for transformation are also competent for transfection and vice versa; transfection with phage DNA represents, therefore, a simple way to measure the total number of competent cells in a culture. The fraction of competent cells, determined by SPP1 DNA infection, varied from 10(-2) to 7 x 10(-2).

Bacillus subtilis↗
PubMedDate not supplied

Congenital misalignment of pulmonary vessels and alveolar capillary dysplasia: how to manage a neonatal irreversible lung disease?

Congenital misalignment of pulmonary vessels (MPV) with alveolar capillary dysplasia is a rare condition consisting of anomalous veins in bronchovascular bundles, a decreased number of alveolar capillaries, and increased muscularization of pulmonary arterioles. In the literature, infants reported as having such a malformation developed respiratory distress with persistent pulmonary hypertension and ultimately died. We report the case of an infant with MPV and alveolar capillary dysplasia who was unresponsive to maximal cardiorespiratory support, including high-frequency oscillatory ventilation and inhaled nitric oxide; the infant died of pulmonary hemorrhage after 19 days, during venoarterial extracorporeal membrane oxygenation bypass. We conclude that the diagnosis of MPV and alveolar capillary dysplasia should be considered during autopsy of infants who have died of irreversible persistent pulmonary hypertension. If a lung biopsy in infants with prolonged refractory hypoxemia confirms such diagnosis before death, expensive and invasive treatments such as extracorporeal membrane oxygenation could be avoided.

Administration, Inhalation↗
PubMedDate not supplied

Hemodynamic effects of ibopamine in patients with idiopathic congestive cardiomyopathy.

We administered 150 mg of ibopamine orally to 10 patients suffering from idiopathic congestive cardiomyopathy. Hemodynamic function was evaluated by right heart catheterization and by measurement of cardiac output with the thermodilution technique. Ibopamine caused no significant change in heart rate or mean arterial pressure. Cardiac index, stroke volume index, and left ventricular work index all increased significantly by about 30%. Mean pulmonary arterial pressure decreased by about 30%, and systemic vascular resistance decreased by about 20%. The effects peaked at about 3 h and lasted 5-7 h. No side effects were noted. These findings with invasive techniques confirm those of others using noninvasive techniques, and suggest that ibopamine may be useful in the treatment of congestive heart failure.

Adult↗
PubMedDate not supplied

Disseminated Burkitt's lymphoma after kidney transplantation: a case report in a boy with Drash syndrome.

PURPOSE: We discuss the clinical, laboratory findings and treatment of a boy who developed Burkitt's lymphoma (BL) after renal transplant and some issues about lymphoproliferative disorders after transplantation. METHODS: A 6-year-old boy with Drash syndrome developed disseminated Burkitt's lymphoma 38 months after transplantation for renal failure. Immunosuppressive therapy had consisted of prednisolone and cyclosporine. Polychemotherapy was initiated. RESULTS: Polychemotherapy induced rapid and complete remission of the disease without major side effects despite the renal transplant allograft and prolonged immunosuppression. CONCLUSIONS: A child with posttransplantation B-cell high-grade lymphoma can be successfully treated with the same chemotherapy regimen used for ordinary cases.

Antineoplastic Combined Chemotherapy Protocols↗