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Biomedical subjects

R Katz

Publications and source records attributed to R Katz.

At least 271 records · Page 15Linked to original sources
PubMed1981

A circle system with a rotating wick vaporizer.

The humidity output of a circle system was raised to 28 mg H2O/l by the use of a modified rotating wick vaporizer placed in the center of the soda lime canister and coaxial inspiratory and expiratory limbs. Both the fresh gas inflow and the expired gases passed through the lime and reached a compartment below it. The bag/ventilator connector, bearing a pressure relief valve, opened on the lateral wall of that compartment. Gases returning to the inspiratory valve passed: (1) through a tube in the canister connecting the inferior compartment to the vaporizer above water level, (2) through the upper portion of the vaporizer and around the rotating wick, and (3) through a tube emerging from the top of the vaporizer to reach the inspiratory valve. Thus inspired gases were humidified by the rotating wick constantly replenishing its water content warmed by the reaction of neutralization. The use of coaxial inspiratory and expiratory limbs reduced water condensation outside the canister.

Anesthesiology↗
PubMed1981

Exposure to halothane and enflurane affects learning function of murine progeny.

This study was conducted to assess the learning function of murine progeny born of mothers that had received either 1% or 2% halothane or 2% or 4% enflurane, on days 6 and 10 or days 14 and 17 or gestation. Their timed performance at the age of 6 to 7 weeks was compared in a maze with that of control mice of similar ages that had not been exposed to anesthetics prenatally. All mice exposed to halothane in utero performed poorly at first, especially the group with mothers exposed to 2% halothane on days 14 and 17 of pregnancy. By the 10th training period, the performance of all mice improved but remained significantly slower than control mice. The offsprings of mice exposed to enflurane also performed poorly on the first training period, but between the fifth and seventh training periods, made statistically significant progress. However, they too remained slower in maze performance than control mice. Although blood pressure and arterial blood gas studies were only performed on two pregnant mice, data obtained suggest that the anesthetics did not have sufficient effect on respiration to affect our results. Second generation offspring, born to dams exposed to 2% halothane in utero late in pregnancy and sired by normal unexposed males, were also consistently slower than control mice, indicating a possible genetic effect induced by the anesthetic.

Animals↗
PubMed1980

Modification of avian sarcoma proviral DNA sequences in nonpermissive XC cells but not in permissive chicken cells.

For the first time, we present evidence with restriction enzymes HpaII and MspI which indicates that the proviral DNA sequence of avian sarcoma virus is modified by methylation in a nonpermissive rat cell line but not in permissive chicken cells. Some of the endogenous viral sequences in the permissive cells were also methylated. No 5-methylcytosine could be detected in the unintegrated viral DNA.

5-Methylcytosine↗
PubMed1980

Pulmonary echinococcosis: a pediatric disease of the Southwestern United States.

Three cases of pulmonary echinococcosis in native American children emphasize the need to consider the diagnosis in the differential diagnosis of mass lesions of the chest when the appropriate environmental conditions are present. Two children presented with a non-productive cough, while one was asymptomatic. Surgery is the treatment of choice for pulmonary echinococcal cysts. All three children did well after thoracotomy, and one child has a normal roentgenogram six years after surgery. Recent evidence seems to indicate that transmission of the Echinococcus among native Americans in the Southwest is increasing, and thus human echinococcal disease may be of increasing clinical importance.

Child, Preschool↗
PubMed1979

Necrolytic migratory erythema, presenting as candidiasis, due to a pancreatic glucagonoma.

A 54-year-old male with diabetes, weight loss, glossitis and Candidiasis presented with the typical cutaneous eruption of necrolytic migratory erythema. The suspicion of pancreatic glucagonoma was confirmed by an elevated plasma glucagon level. Surgical removal of the pancreatic alpha cell tumor resulted in a complete disappearance of all symptoms. The importance of the recognition of the skin eruption of necrolytic migratory erythema as a clue to the presence of pancreatic glucagonoma is emphasized.

Candidiasis↗
PubMed1979

Non-effect of Massachusetts cement kiln dust upon the food intake, body weight, or activity of female rats.

The addition of Georgia cement kiln dust to the diet of cattle or weanling male rats has been reported to increase body weight and feed efficiency. We attempted to replicate these effects by adding kiln dust to the Purina laboratory chow of adult female rats. Massachusetts cement kiln dust caused no significant change in food intake, weight gain, or activity. The kiln dust effect appears, therefore to depend upon (a) ingredients peculiar to Georgia kiln dust, (b) age (juveniles vs. adults), (c) sex and/or (d) deficiencies of the control diet.

Animals↗
PubMed1979

Glottic reconstruction after near total laryngectomy.

It is generally accepted that vertical partial laryngectomy can yield satisfactory cure rates in properly selected glottic carcinomas. Several authors have discussed different reconstructive techniques following extended vertical partial laryngectomy. These have included the use of stents, keels, various soft tissue "free" grafts, or muscle transplants. All of the above require prolonged tracheostomy and staged surgical procedures with the resultant upper airway sometimes being less than satisfactory.

Adult↗