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Biomedical subjects

A Pinotti

Publications and source records attributed to A Pinotti.

7 recordsLinked to original sources
PubMed2001

Effect of aluminum sulfate and cationic polyelectrolytes on the destabilization of emulsified wastes.

Emulsified oil in wastewater constitutes a severe problem in the different treatment stages. Aluminum salts have been traditionally used as coagulants in wastewater treatments. Polyelectrolytes are used to coagulate and flocculate colloidal systems. The performance of aluminum sulfate in comparison to polyelectrolytes (chitosan and polyacrylamide) as conditioning chemicals for an emulsion waste was tested, and the predominant mechanisms acting in each case were analyzed. Turbidimetry, jar test, colloidal titration and microscopy were used to test emulsion destabilization. Both charge neutralization and bridge formation were identified and confirmed as mechanisms of interaction of polyelectrolytes with waste constitutents. Charge neutralization would be more important for chitosan than for polyacrylamide treatment. A coincidence between the doses necessary to reach zero colloidal charge and minimum turbidity was observed for polyelectrolytes. The time necessary to produce system clarification was larger for aluminum sulfate than for polyelectrolytes; this time was shortened for higher aluminum sulfate concentration. The pH showed a marked effect on aluminum sulfate performance with the optimum at pH 6; polyelectrolyte action was practically not affected by pH. Polyelectrolyte addition produced the minimum turbidity for the same doses that zero colloidal charge; at higher doses, emulsion was restabilized and became turbid again. However, aluminum sulfate treatment did not produce emulsion restabilization.

Acrylic Resins↗
PubMed1998

Mathematical modelling of microbial growth in packaged refrigerated beef stored at different temperatures.

Gompertz and logistic models were fitted to experimental counts of microorganisms growing in beef stored at 0, 4, 7, 9 and 10 degrees C. Samples were packaged in polyethylene (high gaseous permeability) and in EVA/SARAN/EVA (low gaseous permeability) films, being EVA ethyl vinyl acetate and SARAN polyvinyl and polyvinylidene chloride copolymer. Lag phase duration (LPD) and specific growth rate (mu) were obtained as derived parameters for lactic acid bacteria, Enterobacteriaceae, Pseudomonas sp. and psychrotrophic microorganisms. The reciprocal of LPD was fitted to an Arrhenius type equation; LPD of lactic acid bacteria showed a marked dependence on temperature, with activation energy values (ELPD) of 222.2 and 216.9 kJ/mol for polyethylene and ESE respectively. The effect of initial microbial population at different storage temperatures on adaptation period was analyzed. As the initial microbial population increased, adaptation period decreased for all studied microorganisms and for both packaging films. The effect of temperature on specific growth rate was better interpreted by the Arrhenius model than by the linear or the square root equations. Psychrotrophic microorganisms in beef showed the highest activation energy values for specific growth rate (E mu) in both packaging films, being E mu 85.50 and 103.10 KJ/mol for polyethylene and ESE film respectively. In both films, Enterobacteriaceae showed the lowest E mu values, being 15.33 and 59.89 kJ/mol in ESE and polyethylene respectively. The final number of microorganisms (maximum population density) did not show significant changes with storage temperature.

Animals↗
PubMedDate not supplied

[Synchronous esophageal and stomach neoplasm: importance of diagnosis and treatment].

The association of esophageal and gastric cancer has been described because of the better technology in methods for diagnosis. In surgery for esophageal cancer, a gastric tube is often prepared to provide a new route for oral ingestion. Although patients with simultaneous esophageal cancer and gastric cancer have been reported, it is often difficult to diagnose the coexistence of gastric cancer preoperatively due to the presence of esophageal stenosis. In this paper we report on one case of the rare combination of squamous cell cancer of the esophagus and simultaneous adenocarcinoma of the stomach.

Adenocarcinoma, Mucinous↗
PubMedDate not supplied

[Initial phase of the left ventricular ejection (mesosystole) in coronary artery disease].

In patients with coronary artery disease (CAD), the ventricular ejection is altered specially the initial phase or the mid-systole. We studied such abnormalities through two-dimensional echocardiography and phonocardiography. We studied 40 patients with CAD and 11 normal subjects, we determined the times and volumes of total, initial and end of systole for to calculate the ejection fraction, integrated ejection and mean ejection rate. The measurements of total systole did not show important differences. In contrast, the initial ejection time (IET), the initial integrated ejection (IIE), the mid-systolic stroke volume (MSV), the mid-systolic ejection fraction (MEF) and the mean mid-systolic ejection rate (MMER) showed significant differences. The CAD group compared with normal subjects, had lower values of IET (P less than 0.05), MSV and MEF (P less than 0.01). The presence of myocardial infarction, the number of arteries with significant obstruction and the elevation of the left ventricular enddiastolic pressure had relationship with decrease in IIE (P less than 0.01) and with amount of MSV, MMER and MSV/end systolic stroke volume ratio (P less than 0.01). On the other hand, patients with angina, specially unstable and in those with ventricular aneurysm, the IIE showed higher values (P less than 0.01) and MSV, MMER, the percentage of mid-systolic ejection fraction and MSV/ESV ratio were lower (P less than 0.01). We conclude that in CAD, the mid-systolic changes are more sensitive than those of the whole systole. In presence of heart failure, the reduced stroke volume is ejected almost totally in the initial period or mid-systole. In patients with ventricular aneurysm or in those with unstable angina is the opposite behavior, the mid-systolic ejection is reduced and the small volume is ejected in the end last period or end systole. These observations could be useful to recognize the damage and the severity of it in CAD.

Coronary Disease↗
PubMedDate not supplied

[Electro-echocardiographic correlation in mitral valve prolapse].

The study was performed in 33 patients with echocardiographic diagnosis of mitral valve prolapse (PVM), without any other associated heart disease. A 19 derivations electrocardiogram (ECG) was performed a direct inscription 4 channel Samborns 150 machine at 25 and 50 mm/sec. The purpose of the study was determine the alterations in ventricular depolarization and repolarization, and to correlate them with valve prolapse, as well as with cavitary and parietal dimensions, as measured by M mode and/or two-dimensional echocardiography. Left ventricular hypertrophy detected by ECG agreed with the ECO test in 77%; the sensitivity was of 86% and specificity of 67.5%. Left ventricular hypertrophy detected by ECG was not related with the type of prolapse. Ventricular repolarization alteration was very frequent (84.8%). Association of this parameter with initial notch of R in a VF becomes important for diagnosis suspicion (p less than 0.01). When the abnormal repolarization affected the anterolateral wall, posterior valve prolapse was frequent; when the posteroinferior region was the affected one, the prolapse occurred more frequently in both valves. An important correlation (p less than 0.01) was found between left ventricular dilatation detected by ECO and the abnormal ventricular repolarization.

Adolescent↗
PubMedDate not supplied

[Clinical diagnosis of left auricular myxoma based on its echocardiographic and surgical verification].

We studied six patients with atrial myxoma, 5 occurred in left atrium and one in the right atrium, the diagnosis was verified with echocardiogram and surgery, we determined the clinical, electrocardiographic and radiological differences between the mitral stenosis and myxoma. We found that patients with atrial myxoma have no history of rheumatic fever, the dyspnea was less severe of shorter and duration, patient had paroxysmal dyspnea. In contrast dizziness, faintness, hemiparesis and/or angina were the more frequent symptoms. A diastolic mitral snap was a very frequent finding, less frequent was the diastolic rumble no patient had pre-systolic murmur. The left atrium was generally not dilated and the left atrial appendage as well as the pulmonary artery were not prominent in chest X-Rays. The P wave in lead II was not more than 0.11 sec and the ventricular complex in VI did not show tall R ware. With the previous elements it is possible to suspect the diagnosis of left atrial myxoma. The diagnosis should, of course, be confirmed by echocardiography.

Adolescent↗