Biomedical subjects
Publications and source records attributed to K W Smith.
Semiempirical molecular orbital calculations have been performed on a series of hydrazone uncouplers of mitochondrial oxidative phosphorylation which show insecticidal activity. Regression analysis yielded significant correlations between uncoupling activity, insecticidal potency and such physicochemical or theoretically-derived parameters as lipophilicity, pKa and atom charges.
Explore the source record for details and available documents.
Metabolic changes between the preoperative period and the defunctionalized stage after ileal pouch-anal anastomosis were investigated in 21 patients. Aspects studied included weight change, renal function, liver function, lipid metabolism, and two hematologic parameters. Of 21 patients, 19 lost weight. Cholesterol levels decreased from 183 +/- 30 IU/1 to 122 +/- 48 IU/1 (P less than .0001). Triglyceride levels rose from 95 +/- 29 IU/1 to 190 +/- 86 IU/1 (P less than .01). Significant elevations were seen in values of four liver function tests: SGOT, SGPT, lactic dehydrogenase, and alkaline phosphatase (P less than .05). Blood urea nitrogen levels increased from 11.1 +/- 4.7 mg/100 ml to 21.8 +/- 24.8 mg/100 ml (P less than .05). Serum creatinine levels rose from 0.97 +/- .18 mg/100 ml to 1.5 +/- 1.2 mg/100 ml (P less than .05). Uric acid levels increased from 5.6 +/- 1.8 mg/100 ml to 7.5 +/- 2.3 mg/100 ml (P less than .001). Hemoglobin values did not change significantly. Platelet counts rose from 304,000 +/- 79,000 to 447,800 +/- 189,000 (P less than .05). Identification of these systematic alterations in metabolic parameters during the defunctionalized stage can aid the physician in management of these patients.
This study evaluated the validity of the scoring systems employed by 41 health risk assessment instruments (HRAs) with respect to the probability of death due to coronary heart disease. Validity was assessed by comparing predictions of mortality risk produced by each HRA to estimates from the Framingham Heart Study and the Risk Factor Update Project. Correlations with both epidemiologic estimates indicated that instruments employing logistic regression or the Geller/Gesner methodology had the highest validity coefficients, while validity was lowest for self-administered general health status and lifestyle questionnaires. However, most instruments using the Geller/Gesner technique appear to systematically overestimate the probability of CHD mortality. For HRAs based on additive risk scales, validity was often attenuated by the crude categorization of some risk factors and by the omission of the effects of age from the scoring system.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
The technique of single-layer continuous polypropylene colorectal anastomosis is described. The authors' experience with their initial 100 cases is analyzed in detail. No clinical leaks or anastomotic strictures were noted in a two-year follow-up period. The technique is safe, easily learned, rapidly performed, and it does not add significantly to the cost of medical care. The authors' total experience with this anastomosis now exceeds 350 cases.
Inhibition of bacterial metabolism by the lactoperoxidase (LP)-hydrogen peroxide (H2O2)-thiocyanate system was studied with representatives of serotypes a through g of Streptococcus mutans. The aims were to determine whether the amount of H2O2 released from these catalase-negative bacteria is sufficient to activate the LP system and whether these oral bacteria are resistant to inhibition by the LP system, which is active in human saliva. When the washed, stationary-phase cells were incubated aerobically with LP, thiocyanate, and glucose (Glc), greater than 90% inhibition of Glc utilization and lactate production was obtained with strains that released large amounts of H2O2 (BHT, FA-1, OMZ-176); 20 to 50% inhibition was obtained with strains that released about half as much H2O2 (B-13, Ingbritt); and no inhibition was obtained with strains that released only small amounts of H2O2 (AHT, HS-6, GS-5, LM-7, OMZ-175, 6715-15). Inhibition was most effective at pH 5, whereas release of H2O2 and accumulation of the inhibitor (hypothiocyanite ion) were highest at pH 8. With H2O2-releasing cells from early stationary phase, preincubation with Glc abolished inhibition, though it did not influence H2O2 release. Cells harvested 24 h later were depleted of sulfhydryl compounds. Inhibition of these cells was abolished by preincubation with Glc and certain sulfhydryl or disulfide compounds (reduced or oxidized glutathione, cysteine or cystine). This preincubation increased cell sulfhydryl content but had no effect on H2O2 release. All strains were inhibited when incubated with LP, thiocyanate, and added (exogenous) H2O2. Smaller amounts of H2O2 were required to inhibit at pH 5, and larger amounts were required to inhibit cells preincubated with Glc or with Glc and the sulfhydryl or disulfide compounds. The results indicate that pH, amount of H2O2, cell sulfhydryl content, and stored-carbohydrate content determine susceptibility to inhibition.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Since the first successful resection of a colonic neoplasm was carried out in 1823, many attempts have been made to find the ideal technique for bowel anastomosis, in respect both of the surgical technique employed and the suture material used. We have finally adopted a single layer anastomosis with a continuous polypropylene suture. To out knowledge, no series of such anastomoses has so far been reported, and we now review our technique, first described by Allen in 1979, and our very satisfactory experiences following our adoption of it for virtually all colorectal anastomoses above the peritoneal reflection.
A joint clinical study was conducted to test the effectiveness of topical dinitrochlorobenzene ointment in the treatment of warts. The feasibility of this therapeutic modality was demonstrated by the fact that warts completely cleared in more than 80 percent of the eighty-four patients enrolled in the study. Healing time average from three to six weeks. Complications incurred are presented and ways to minimize them are reviewed.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
The purpose in this study was to determine whether there was a significance difference between conservative management and plating of scapular body fractures. Bilateral scapular body fractures were created in 10 dogs. The left scapula in each dog was treated by open reduction and plating of the scapular spine. The right scapula was not treated. Plating enhanced healing and early return of function, but there was no significant difference in the long-term results.
Explore the source record for details and available documents.
Explore the source record for details and available documents.