Life Sciences Commons^™

Studies On The Occurrence And Elemental Composition Of Bacteria In Freshwater Plankton, K. N. Booth, D. C. Sigee, E. Bellinger

Scanning Microscopy

The occurrence and cation content of bacteria in a eutrophic freshwater lake (Rostherne Mere, Cheshire, UK) were investigated over a one year sampling period in relation to cation changes in the lake surface water and phytoplankton.

Scanning electron microscope examination of trawl-net and filtered samples demonstrated bacterial association with Anabaena, Aphanizomenon and diatoms. Direct counts of associated and unassociated bacteria showed that increases in bacterial population relate to population decline of major algal constituents.

Spectrophotometric determination of selected cation levels in the lake water demonstrated wide fluctuations throughout the sampling period, with elevated levels of transition metals before and at …

The Electron Microscope Detection And X-Ray Quantitation Of Cations In Bacterial Cells, D. C. Sigee, M. H. El-Masry, R. H. Al-Rabaee

Scanning Electron Microscopy

Electron microscope autoradiography and X-ray microanalysis have been used for the detection and quantitation of cations in the bacterium Pseudomonas tabaci. These techniques differ in the information they provide (relating to either cation uptake or in situ levels), their applicability to different cations, their sensitivity and their spatial resolution. With uptake of ⁶³Ni²⁺, high resolution autoradiography (involving gold latensification and physical development) demonstrated a high degree of cation localisation to the central nucleoid area (glutaraldehyde-fixed cells) and within this to the constituent chromatin (acetic-alcohol preparations).

X-ray microanalysis of whole bacterial cells revealed the presence of substantial levels …

Characterization Of Gram-Positive Bacterial Isolates From Burn Victims, Trisha A. Hannan

Dissertations and Theses

Streptococcus and Staphylococcus were collected from patients hospitalized at the Oregon Burn Center, Emanuel Hospital, Portland, Oregon, between October 27, 1980 and January 1, 1981. Forty-five isolates of Staphylococcus and twenty-one isolates of Streptococcus, Lancefield Group D, were included in the investigation.

The objectives of the investigation were: (i) to identify to the species level all isolates, (ii) to determine their susceptibility to antimicrobial agents, (iii) to test the organisms. over time for increasing resistance to silver, (iv) to determine, if present, a bacterium harbored within the burn unit (nosocomial bacterium), and (v) to determine any recognizable pattern of successive …

Limnological Aspects Of Lake Mead, Nevada-Arizona, John R. Baker, James E. Deacon, Thomas A. Burke, Samuel S. Egdorf, Larry J. Paulson, Richard W. Tew, Bureau Of Reclamation

Publications (WR)

Lake Mead is a deep, subtropical, moderately productive, desert impoundment with a negative heterograde oxygen profile occurring during; the summer stratification. investigations of the Boulder Basin of Lake Mead by the University of Nevada were initiated in November 1971. The primary objective of the study was to determine what effects industrial and sewage effluent from the Las Vegas metropolitan area, discharged into Las Vegas Bay, have had on the water quality and limnological conditions of Boulder Basin. Data from the 1975-76 period are presented in detail, with earlier data included in the summaries and discussions.

Measurements of water temperature, dissolved …

Characterization Of Selected Bacteria From The North Arm Of The Great Salt Lake, John L. Crane Jr.

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Thirteen bacterial cultures were isolated from the North arm of Great Salt Lake during the months of January and February of 1973. Eleven isolates were gram-negative pleomorphic rods which lysed in hypotonic solution. The remaining two were gram-positive cocci. All isolates and one known strain of Halobacterium salinarium were subjected to examination of morphological, cultural, physiological, and biochemical characteristics. A numerical taxonomic analysis was applied to the compiled characters to compute a coefficient of similarity for each individual isolate as compared to all other isolates. A comparative analysis was included in the similarity computation using characters assembled from those reported …

The Effects Of Atropine On The Growth And Respiration Of Two Species Of Bacteria Normally Inhabiting The Human Gastro-Intestinal System, Mary M. Ramos

Theses & Dissertations

It is the purpose of this study to determine whether the drug atropine has an effect on bacteria found normally inhabiting the human body, most specifically the gastrointestinal system. Atropine is one of the oldest drugs in medicine. It is derived from the roots and leaves of solanaceous plants such as henbane and Jimson weed. Atropine is often termed a belladonna alkaloid because it can also be found in the deadly nightshade plant, Atropa belladonna. Atropine is a highly competitive antagonist of acetylcholine at receptor sites in smooth muscles, cardiac muscle, and various glandular cells (5). Therefore, its effects are …

Studies On Some Bacteriolytic Bacteria Isolated From An Oxidation Pond, Paul Christian Radich

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

During bacteriological studies of the Logan City Sewage Oxidation Ponds, Logan, Utah, a group of bacteria was discovered which could lyse killed cells of Escherichia coli. The present research effort was an attempt to determine whether two isolates from this earlier study might play a role in the reduction of coliforms and other bacteria in the oxidation ponds. It was also desired to characterize partially the lytic enzymes produced by the two isolates and to determine as far as possible the organisms' identity.

Both isolates were Gram negative rod-shaped organisms with a single polar flagellum. On Cytophaga agar they …

The Effect Of Las Vegas Wash Effluent Upon The Water Quality In Lake Mead, D. A. Hoffman, P. R. Tramutt, F. C. Heller, Bureau Of Reclamation

Publications (WR)

This study developed from observations made during an earlier study on Lake Mead which was reported in CHE-70, Water Quality Study of Lake Mead. Results from that study indicated that poor-quality water was flowing into the Las Vegas Bay reach of Boulder Basin, Lake Mead. Also reports of deteriorating water quality, resulting in taste and odors in domestic water supplies taken from Boulder Basin as well as a reduction in the attractiveness of Las Vegas Bay for recreational uses caused by aquatic plants and algae blooms, indicated a need for a concentrated study concerning the effects of flows from Las …

Studies On An Antibiotic-Producing Strain Of Bacillus Megaterium X, Kishori Madhukar Chaubal

University of the Pacific Theses and Dissertations

On July 10, 1968, while observing the effects of ultra-violet light on a plate culture of Sarcino lutea, o contaminant was found growing in the form of a colony surrounded by a clear zone of inhibition where S. lutea had failed to grow. A smear from this contaminant colony was found to contain a Gram positive, chain-ond spore-forming bacillus. The organism was isolated and its antagonism against S. lutea was reshocked. Preliminary investigation of its activity against other bacteria indicated that this activity was directed against 5. lutea only. I was decided to continue the investigations with two aims in …

Molds And Bacteria In House Dust And Furniture Stuffing, Mary Ann Swaebly

Journal of the Minnesota Academy of Science

No abstract provided.