Two lines of chickens, derived by two-way selection for either a high (HPC) or low (LPC) plasma corticosterone response to social stress, were inoculated with Marek's disease virus (MDV). Lymphocyte transformation (LT) microassays were performed to assess the CMI response of leucocytes from HPC and LPC MDV-infected chickens. Blastogenesis was quantitated by ³H-thymidine uptake. Leucocytes from chickens specifically sensitized with either heat-killed tuberculin or 1,5-di-fluoro-2,4-dinitrobenzene were subsequently stimulated in vitro with either purified protein derivative (PPD) or dinitrophenyl-bovine serum albumin (DNP-BSA) conjugate. Phytohemagglutinin (PHA-P) was used to assess non-specific lymphocyte transformation. MDV-infected HPC and LPC chicken leucocytes were also compared for their ability to lyse ⁵¹Cr-labeled fowl erythrocytes upon stimulation with PHA-P. Leucocytes from non-infected LPC control chickens underwent blastogenesis to a greater extent than did non-infected HPC control chickens. Although all tumor-bearing chickens demonstrated a markedly suppressed LT response, LPC chickens demonstrated a greater LT response than did HPC chickens. Relative to steroid level chickens infected with MDV, but without tumors, demonstrated a suppressed LT response; however, this response was greater than that of chickens with tumors, but less than that of normal controls. Under conditions of sustained high social stress, HPC chickens demonstrated a decreased cell-mediated cytotoxicity (CMC) in comparison with LPC chickens. In both steroid lines, CMC decreased with the onset and severity of tumors. The impaired CMI seen in the HPC line corresponded with an increased tumor incidence and a greater mortality in this line than in the LPC line. Metyrapone, a chemical which blocks adrenal corticosterone synthesis, transiently enhanced CMC and initiated tumor regression in birds debilitated with MD tumors. Early treatment with 500 ppm metyrapone mixed in feed was most effective. / M.S.

Members of the genus, Treponema, require long-chain fatty acids for growth in vitro. Serum, added to culture medium, provides a source of long-chain fatty acids. These fatty acids, however, are esterified to triglycerides, phospholipids, and cholesterol. In this study, the major pathways of complex lipid catabolism in five species of Treponema were investigated. Lipase, the enzyme which hydrolyzes triglycerides, was demonstrated using four lipid substrates in five species. Chromatographic data demonstrated that, during growth, treponemes completely utilized lysophosphatidylcholine, present in serum-supplemented culture medium, while phosphatidylcholine and phosphatidylinositol were not utilized. Whole cultures and cell free extracts were examined for the presence of specific enzymes of phospholipid catabolism. Phospholipase B and glycerophosphorylcholine diesterase activities were demonstrated in five species of Treponema. Acid phosphatase activity was demonstrated in two species. Utilization of L-α-glycerophosphate and glycerol, products of phospholipid catabolism, was examined. Glycerol was utilized from culture medium by one species, while α-glycerophosphate was utilized by four species. Phospholipases A, C, and D, α-glycero-phosphate dehydrogenase, and alkaline phosphatase activities were not found in five species of Treponema. Based on the specific enzymes demonstrated in this study, two pathways of phospholipid catabolism are proposed. / M.S.

Benthic blue-green algal mats in Lake Bonney, South Victoria-land, Antarctica, were investigated during the 1972-73, 1973-74 and 1974-75 austral summers. This investigation included (1) the distribution, structure, biological and chemical composition, and (2) measurements of photosynthesis, respiration and accumulation rates and modes of mats from the lake and associated meltstreams. The contribution of mat primary productivity to the total lake metabolism was estimated. Thin lemon-yellow mats of high algal diversity dominated by diatoms and filamentous blue-green algae comprised the stream mat community. These mats inoculated shallow areas in the lake undergoing glacial sediment influx where thick (up to 2.5 cm) laminated mats resided. The thick mats had orange upper surfaces and dark blue-green, sometimes anaerobic bottoms. Further from stream sources, mats were thinner, less laminated and more fractured. Mat pieces detached and rose into the water column buoyed by gases where they photo-oxidized, decomposed, or became frozen in new winter ice. Oscillatoriaceous algae (<i>Schizothrix, Oscillatoria</i> and <i>Phormidium</i> spp) dominated the thick mats. Diatoms (<i>Navicula</i> and <i>Nitzschia spp</i>) and coccoid green algae resided near mat surfaces and <i>Nostoc</i> sp grew throughout the mats. Thick mats photosynthesized at a range of 118-667 mg O₂/m²/12 hr and respired at a range of 100-460 mg O₂/m²/12 hr. Thin lake mats 2 photosynthesized at an average rate of 47 mg O₂/m²/12 hr and respired at a rate of 34 mg O₂/m²/12 hr. Thick lake mat fixed carbon at a range of 330-470 mg C/m²/12 hr with high dark bottle values, while stream mat fixed carbon at a range of 320-340 mg C/m²/12 hr with low dark bottle values. Comparisons of standing crop, carbon fixation rates and annual lamination patterns enabled identification of a variable growth pattern spanning 5-10 yr. Comparisons between lake mat and phytoplankton productivity data led to an estimated mat productivity contribution of 20-30% of total lake primary productivity. This investigation is the first to encompass all these aspects of benthic algal mat development in lakes and represents the only study yet conducted for Antarctica. / M.S.

李家祥. / 手稿本(cops. 2 & 3 複印本) / Thesis (M.A.)--香港中文大學硏究院哲學學部. / Shou gao ben (cops. 2 & 3 fu yin ben) / Includes bibliographical references: leaves 170. / Li Jiaxiang. / Thesis (M.A.)--Xianggang Zhong wen da xue yan jiu yuan zhe xue xue bu. / Chapter 第一章 --- 前言 --- p.1 / Chapter a --- 序 --- p.1 / Chapter b --- 關於唐君毅先生著作的分歧問題 --- p.7 / Chapter c --- 唐君毅先生早年形上學要略 --- p.14 / Chapter 第二章 --- 証立心之本體之道路 --- p.20 / Chapter a --- 世間悲情之現起 --- p.23 / Chapter b --- 超越要求之出現 --- p.28 / Chapter c --- 從用見體 --- p.37 / Chapter d --- 本體之証立 --- p.49 / Chapter 第三章 --- 心之本體的特種特性 --- p.59 / Chapter a --- 本體之在其自身 --- p.59 / Chapter b --- 本體之表現 --- p.63 / Chapter c --- 本體之無限性 --- p.68 / Chapter d --- 本體之至善 --- p.74 / Chapter 第四章 --- 現實世界之存有上之形上根據 --- p.78 / Chapter a --- 世界之顯現 --- p.79 / Chapter b --- 物質之存有性 --- p.86 / Chapter 第五章 --- 人之存有性 --- p.96 / Chapter a --- 「人」是什麼? --- p.98 / Chapter 第六章 --- 心之本體之自我回歸 --- p.106 / Chapter a --- 罪惡 --- p.112 / Chapter b --- 道德 --- p.115 / Chapter c --- 本體回歸之途程 --- p.119 / Chapter d --- 餘論 --- p.135 / Chapter 第七章 --- 評論 --- p.140 / Chapter a --- 唐先生對哲學的態度 --- p.141 / Chapter b --- 對唐先生哲學相干的批評 --- p.144 / Chapter c --- 唐先生早年形上學所提供的世界觀對人生活動之指向 --- p.145 / Chapter d --- 契入這個世界觀的道路 --- p.151 / Chapter e --- 唐先生晚年對這一型形上學之安頓 --- p.156 / Chapter f --- 總結 --- p.168 / 參考書目 --- p.170

Th. 3e cycle--Géogr.--Saint-Étienne, 1975.

No description available.

No description available.

Univ., Diss.--Trier, 2003.

by Victoria Y. Jin, Alexander H. Levis. / Cover title. / Includes bibliographical references (p. 9). / Research supported by the Office of Naval Research. N00014-84-K-0519 Research supported by the Basic Research Group of the Joint Directors of Laboratory through the Office of Naval Research. N00014-85-K-0782

Th. 3e cycle--Sci. écon.--Rennes 1, 1979.