Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 9 of 9
Full-Text Articles in Life Sciences
The Fecal Shedding Of Listeria Monocytogenes By Conventional And "Germ Free" Mice, Margaret Joyce Ramsay
The Fecal Shedding Of Listeria Monocytogenes By Conventional And "Germ Free" Mice, Margaret Joyce Ramsay
Loma Linda University Electronic Theses, Dissertations & Projects
A series of experiments involving Listeria monocytogenes was undertaken to study first the fecal shedding of Listeria by conventional mice challenged intraperitoneally with Listeria and second the fecal shedding and ability to survive of germ free mice with similar challenge. In addition, mites infesting Listeria infected mice were cultured for their possible contamination by Listeria.
Conventional mice were challenged intraperitoneally with a single near LD50 dose of Listeria. Fecal Listeria were detected by collecting specimens from each mouse daily for the first 4 days and every second day thereafter. The feces was held at 7°C for 14 …
Host And Prophage Modifications Of Ultraviolet Induction In Salmonella Potsdam, Bela B. Toth
Host And Prophage Modifications Of Ultraviolet Induction In Salmonella Potsdam, Bela B. Toth
Loma Linda University Electronic Theses, Dissertations & Projects
In induction experiments with naturally occurring and artificially lysogenic strains of S. potsdam, cells were irradiated in buffer, transferred to complete medium, and then assayed for free phage. Irradiation was followed by half hourly samples for free phage from the growing populations of irradiated cells. For an estimation of burst sizes, the irradiated cells were diluted out to a final concentration of 1 cell per ml and distributed to tubes in 0.5 ml quantities. All assays were done by the top-layer method with streptomycin incorporated in the top-layer and SP2-strr as the bacterial indicator. The non-lysogenic strain S. …
Isolation Of A Toxic Substance From Centaurea Repens, Merton E. Sprengel
Isolation Of A Toxic Substance From Centaurea Repens, Merton E. Sprengel
Loma Linda University Electronic Theses, Dissertations & Projects
A poisonous steroid-type compound was isolated from Centaurea repens. After extraction with absolute ethanol, removal of the solvent, addition of 2% HCl to precipitate the pigments, and filtering, the pH was adjusted to 9 with aqueous anunonia. This solution was exhaustively extracted with chloroform, evaporated to dryness, and extracted with ethyl ether.
This fraction was chromatographed on silica-gel plates, using 10:1 1,2-dichloroethane-methanol as the developer. The band at Rf 4.2 was removed and found toxic to mice. Labored, slow, gasping respiration and frequent involuntary muscular contractions became apparent within a few minutes following the intraperitoneal injection into each animal. Death …
A Comparative Study Of The 5- And 3-Meal Plans In Six Convalescent Hospitals In San Bernardino County, Donna J. Meek
A Comparative Study Of The 5- And 3-Meal Plans In Six Convalescent Hospitals In San Bernardino County, Donna J. Meek
Loma Linda University Electronic Theses, Dissertations & Projects
A study comparing the 3- and 5-meal plans of food service, as used in long-stay geriatric units in San Bernardino County, have been compared. Three homes utilizing the 5-meal plan and three utilizing the 3-meal plan, to serve as controls, were chosen. A random sample of ten patients from each home was observed for three days to find the daily average nutrients in the foods served, eaten, and wasted. Also, interviews to compare factual information and attitudes were utilized for sample patients and personnel. The nutritional data was analyzed on the computer.
The results indicated that those on the 5-meal …
Ecology Of Marine Invertebrate Fouling Organisms In Hampton Roads, Virginia, Dale R. Calder
Ecology Of Marine Invertebrate Fouling Organisms In Hampton Roads, Virginia, Dale R. Calder
Dissertations, Theses, and Masters Projects
Investigations were conducted from 15 May 1964 to 3 January 1966 to determine the incidence, distribution, and abundance of marine invertebrate fouling organisms in Hampton Roads, Virginia. Dredging carried out at seven stations revealed that benthic organisms most likely to be involved in fouling were Thuiaria argentea, Alcyonidium verrilli, Microciona prolifera, Amathia vidovici, and Aeverrillia armata. All of these species occur in the Pier 12 berthing area of the Norfolk Naval Base, with. !· argentea and~- verrilli being most abundant. Detailed studies of the organisms attaching to asbestos fiber test panels were made at Pier 12 of the Naval Base. …
Classification And Structures Of The Tidal Marshes Of The Poropotank River, Virginia, James Arthur Kerwin
Classification And Structures Of The Tidal Marshes Of The Poropotank River, Virginia, James Arthur Kerwin
Dissertations, Theses, and Masters Projects
No abstract provided.
The Metabolism Of Krebs Cycle Intermediates And Malonate By Eggs And Early Embryonic Stages Of Arbacia Punctulata, Russell Chancellor Addison
The Metabolism Of Krebs Cycle Intermediates And Malonate By Eggs And Early Embryonic Stages Of Arbacia Punctulata, Russell Chancellor Addison
Dissertations, Theses, and Masters Projects
No abstract provided.
Parasitic Copepods Of Some Antarctic And New Zealand Fishes, David E. Zwerner
Parasitic Copepods Of Some Antarctic And New Zealand Fishes, David E. Zwerner
Dissertations, Theses, and Masters Projects
No abstract provided.
Descriptions Of Fecal Pellets Of Some Common Invertebrates In The Lower York River And Lower Chesapeake Bay, Virginia, John N. Kraeuter
Descriptions Of Fecal Pellets Of Some Common Invertebrates In The Lower York River And Lower Chesapeake Bay, Virginia, John N. Kraeuter
Dissertations, Theses, and Masters Projects
No abstract provided.