Cellulase finishing of woven, cotton fabrics in jet and winch machines.

Some authors have reported that as the applied agitation rate increases, the apparent activity of the endoglucanases from Trichoderma reesei towards cotton cellulose increases more markedly than does the apparent activity of the cellobiohydrolases. This suggests that the quality of cellulase finishing effects on cellulosic textiles may be machine-type dependent. The present work using total crude, endoglucanase-rich and cellobiohydrolase-rich cellulases from T. reesei confirmed that the final properties of woven, cotton fabrics treated under realistic processing conditions in a jet machine, were measurably and perceivably different from those of the same fabrics, treated using the same processing conditions of temperature, time, pH, enzyme concentration and fabric to liquor ratio, but in a winch machine. The results are interpreted in terms of the effects of agitation rate on the adsorption-desorption behaviour of the T. reesei endoglucanases and cellobiohydrolases.

[Chagasic cardiomyopathy in Mexico]. / La miocardiopatía chagásica en México.

Chronic Chagas disease, has been reported in Mexico, but changes in left ventricular function are not well known. We describe 25 patients with chronic trypanosomiasis with congestive cardiomyopathy. All of them lived in zones where the parasitosis is endemic and showed EKG abnormalities compatible with cardiomyopathy: A-V block in 8, RBBB in 9, LBBB in 7, RBBB + LAHB in 4, arrhythmias and ST-S abnormalities in 9 patients. All patients have at least one positive serological test for T Cruzi: indirect haemagglutination in 9, counterimmunoelectrophoresis in 9, complement fixation in 14 and passive agglutination of Latex sensitized beads in 4. The parasite was found by xenodiagnosis in 4 out of 5 cases. All cases had a normal coronary arteriography. The left ventriculography showed hypokinesia or akinesia of the apical, anterolateral and diaphragmatic segments in 8 patients and apical dyskinesia in 2. The ejection fraction varied from 22.3% to 51.6% with a mean of 39%. Chagas disease is a health problem in Mexico and the patients who are hospitalized present severe cardiac involvement.

Fluxo urinário na anestesia pelo halotano / Urinary flow during halothane anesthetic

Dezessete cäes previamente hidratados com soluçäo salina e recebendo pentobarbital sódico, intubados e ventilados artificialmente pelo ventilador Takaoka modelo 600, tiveram pressäo arterial e fluxo urinário registrados durante 15 minutos. Anestesia com halotano em concentraçäo de 0,5 a 1,5% e oxigênio foi administrada durante 30 minutos, quando novamente foram registrados fluxo urinário e pressäo arterial, ocorrendo diminuiçäo da pressäo arterial estatisticamente significante e diminuiçäo do fluxo urinário, estatisticamente näo significante. Os autores concluem que as modificaçöes do fluxo urinário observadas säo devidas a um efeito direto do halotano sobre a funçäo tubular renal, pois, embora estatisticamente significante as alteraçöes da pressäo arterial, näo justificam uma reduçäo do fluxo sangüíneo renal e conseqüentemente diminuiçäo da taxa de filtraçäo glomerular com queda do fluxo urinário

Niveis de potassio plasmatico em caes apos succinilcolina venosa. / Plasma potassium levels in dogs after intravenous succinylcholine

Em vinte caes adultos de ambos os sexos, apos a colheita de sangue venoso no antebraco, para controle do nivel de potassio plasmatico, foram injetados 30 mg. kg-1 de uma solucao pentobarbital sodico a 3% em agua destilada e 1 mg.kg-1 de succinilcolina por via venosa. Foram realizadas tres colheitas de sangue venoso, uma antes da administracao de pentobarbital sodico e da succinilcolina, e as outras duas com intervalo de 15 e 30 minutos, para dosagem do potassio. Os resultados revelam elevacao dos niveis de potassio plasmatico na segunda amostra, isto e, 15 minutos apos a administracao de succinilcolina. Os resultados obtidos com a terceira amostra foram aproximados dos iniciais. A analise estatistica dos resultados da segunda amostra revelou aumeto significativo. Os autores chamam atencao para o perigo da administracao de succinilcolina com pacientes com niveis de potassio plasmatico elevados no pre-operatorio