William Weiss

Bio: William Weiss is an academic researcher from Food and Drug Administration. The author has contributed to research in topics: Bioassay & Pasteurization. The author has an hindex of 3, co-authored 9 publications receiving 97 citations.

The effect of mouthwashes on the oral flora.

Abstract: A study has been made of the efficacy of several commercial mouthwashes representing as many classes of chemical agents. The method employed tends to represent, as closely as possible, the conditions of use. The selective antibacterial activity of the washes was measured in terms of “before” and “after” total bacterial counts, and the incidence of streptococci, staphylococci, fusoform bacteria, and lactobacilli. There is included a study of the length of time that elapses after the use of the mouthwashes before the number of bacteria in the oral cavity reaches the number resent before washing. Data obtained from these studies indicate that each of the compounds significantly reduces the total bacterial count in the mouth, and that some deal selectively with microorganisms. Each mouthwash, however, leaves residues of active bacteria among those removed from the oral cavity by a rinse technique. It appears also that the effect of the compounds is of short duration.

The influence of "oral antiseptics" on the number of bacteria washed out of the mouth as measured by a rinse technique.

Abstract: Hourly rinses of 20 ml each of physiological salt solution for thirty seconds established a pattern of fluctuation in the number of bacteria in the mouth during the course of an eight-hour working day There was a gradual increase in the number of bacteria during the first three hourly washes The influence of eating, between the third and fourth hours, was reflected in a sharp reduction in the number of bacteria recovered at the fourth hourly wash The number of bacteria increased at the fifth hourly wash (first hour after lunch) and continued to increase at each succeeding wash The original prelunch levels in bacterial count were reached by approximately the seventh hour (third hour after lunch) Subsequent tests with "oral antiseptics” were made, employing four rinses at hourly intervals in order to avoid the complicating influence of eating The results of these tests are compared with the levels indicated to be normal by physiological salt solution rinses over the same test periods

Laboratory Tests for the Assessment of Nutritional Status

Abstract: (1973). Laboratory Tests for the Assessment of Nutritional Status. CRC Critical Reviews in Clinical Laboratory Sciences: Vol. 4, No. 3, pp. 215-340.

ON THE QUENCHING OF SINGLET OXYGEN BY α‐TOCOPHEROL

Abstract: —D-α-tocopherol was found to be an effective quencher of 1O2 molecules (k= 2.5 times 108mol-1 s-1 in pyridine) by measuring its effect on the autosensitized photooxidation of rubrene. The quenching process was shown to be almost entirely ‘physical’, that is, α-tocopherol deactivated about 120 1O2 molecules before being destroyed. The results suggest that this process may be a mechanism for the protective effect of α - tocopherol in photodynamic action.

Bioavailability and analysis of vitamins in foods

Abstract: Bioavilability and Analysis of Vitamins in Foods , Bioavilability and Analysis of Vitamins in Foods , کتابخانه دیجیتال جندی شاپور اهواز