New suitable approaches were investigated to visualize the photodynamic inactivation (PDI) of bacteria immobilized on agar surfaces. The PDI capacities of a cationic photosensitizer (5,10,15,20-tetra(4-N,N,N-trimethylammoniumphenyl)porphyrin) and an anionic photosensitizer (5,10,15,20-tetra(4-sulfonatophenyl)porphyrin) were analyzed on a typical…

Extracts of fruit peels contain antioxidants that protect the bacterium "Escherichia coli" against damage induced by ultraviolet light. Antioxidants neutralise free radicals, thus preventing oxidative damage to cells and deoxyribonucleic acid. A high survival rate of UV-exposed cells was observed when grapefruit or grape peel extract was…

Eleven practical microbiology books intended or recommended for schools have been evaluated for safety. A number of the texts are unsatisfactory and suggest techniques and, or organisms which are potentially dangerous. (Author)

Alfalfa hay, cut and baled for fodder, is a source of protein that rivals or surpasses soybeans. Technology that makes possible the extraction of nutrients from this and other non (human)-food sources on land and in the sea can increase the Earth's food potential. (Author/BT)

This student's manual covers analytical methods for residual chlorine and turbidity. Topics include sample handling, permissable concentration levels, substitution of residual chlorine for bacteriological work, public notification, and the required analytical techniques to determine residual chlorine and turbidity. The publication is intended for…

This instructor's guide presents analytical methods for residual chlorine and turbidity. Topics include sample handling, permissable concentration levels, substitution of residual chlorine for bacteriological work, public notification, and the required analytical techniques to determine residual chlorine and turbidity. This publication is intended…

Reference sources on microbiological laboratory design are cited. Subjects covered include--(1) policies and general requirements, (2) ventilated cabinets, (3) animal isolation equipment, (4) air handling, ventilation, and filtration, (5) germicidal ultraviolet irradiation, (6) aerosol test facilities, (7) process production of microorganisms, and…

Information on the centromere, or kinetochore, varies from textbook to textbook. This article reviews and reconsiders how this body is defined. (BB)

Describes types of industrial techniques involving biochemical products, specifying the advantages and disadvantages of batch and continuous processes, and contrasting biochemical and chemical engineering. See SE 506 318 for Part I. (AL)

Compares the problems associated with long-duration manned space missions with environmental problems on Earth. Argues that bioastrononautical research can contribute much in the areas of pollution control, nutrition, microbiology, and group psychology. (EB)

Suggests suitable species of microscopic green algae for demonstrating diversity of form, increasing complexity in related species, the animal" and plant" characteristics of protists, and protist behavior. (AL)