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Articles 1 - 4 of 4
Full-Text Articles in Organisms
Development Of Periapical Lesions In Immunosuppressed Rats, Phillip A. Waterman Jr.
Development Of Periapical Lesions In Immunosuppressed Rats, Phillip A. Waterman Jr.
Loma Linda University Electronic Theses, Dissertations & Projects
The pathogenesis of periapical lesions is the interaction of the oral flora with the existing host defenses. The role of bacteria has been established in endodontic disease but the contribution of the host defenses in periapical lesion formation is less clear. The purpose of this study was to compare periapical lesion development in immunosuppressed rats with that in normal rats. Thirty-five, eight-week old Sprague-Dawley rats were equally divided into seven groups. Groups 1, 2, and 3 were given weekly injections of Cytoxan, an immunosuppressive agent. Groups 4, 5, and 6 received no immunosuppressive therapy. Group 7 served as a control, …
The Influence Of Antimicrobial Use On Bacterial Resistance, James T. Griffith
The Influence Of Antimicrobial Use On Bacterial Resistance, James T. Griffith
Walden Dissertations and Doctoral Studies
Antimicrobial resistance is becoming an increasingly serious problem accompanied by relatively few studies examining the relationship between use and resistance. The present study undertakes a twenty year analysis of antimicrobial production and factors affecting antimicrobial use for a particular microorganism (Stp. faecalis)/antimicrobial agent (Cephalothin) combination. The period is inclusive of the market introduction of the agent and considerate of prescribing practices to the present time. The accumulated data reveal that there is indeed a relationship between total drug availability (medicinal, agricultural) and increased antimicrobial resistance. The data also suggest that national (or global) use changes would likely have a long …
Biodegradation Of Crude Oil By Marine Higher Fungi, Brian J. Dyer
Biodegradation Of Crude Oil By Marine Higher Fungi, Brian J. Dyer
Biological Sciences Theses & Dissertations
Four experiments were performed to determine the ability of marine higher fungi to grow in and degrade crude oil. Eight species, previously determined to be hydrocarbonoclastic, were grown in artificial sea water medium (ASM) and southern Louisiana crude oil. The dry mycelial weights were measured and consumption of crude oil was measured gravimetrically. The two species with the best growth, Corollospora maritima and Zalerion maritimum, were grown in ASM containing crude oil spiked with three known hydrocarbons. To this was added glucose (0.15%) and incubated 49 days to test for possible cometabolism of hydrocarbons. Hydrocarbons remaining in the growth …
Revival Of Metabolism In Rehydrated Marasmius Oreades, Lorie J. Warren
Revival Of Metabolism In Rehydrated Marasmius Oreades, Lorie J. Warren
Honors Theses, 1963-2015
Mushrooms from the genus Marasmius have the ability to revive -- viz., dried specimens regain their original shape when moistened. The purpose of this study was to determine if the basidiocarps are metabolically active upon revival or whether they simply absorb moisture like a sponge. The reduction of tetrazolium chloride to a red, water-insoluble formazan pigment was used as a measure of respiratory activity. Basidiocarp samples were incubated in a phosphate buffer containing 1% tetrasolium chloride. After a suitable period, the samples were extracted with MeOH to remove any formazan pigment and the absorbance measured at 530 nm. Fresh M. …