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.

Glucocorticosteroids are drugs commonly used to suppress immune or inflammatory responses. The present study was done to evaluate the influence of glucocorticoids on immunity in fibrosarcoma-bearing mice. Effects of hydrocortisone-21-sodium succinate (HCS) on mitogen-induced lymphocyte proliferation were assessed. T cells from nontumor-bearing mice showed a 2-fold suppression of phytohemagglutinin (PHA) responsiveness with the addition of 0.1 µg HCS. However, T cells from mice with 3-4 week tumors did not demonstrate as great a suppression, if any. Kinetic studies during tumor growth demonstrated a decrease in HCS suppression of mitogen-induced DNA synthesis at 8-10 days post-tumor cell inoculation. RCS-treated cells from mice with 3-4 week tumors had a 2- fold increase in blastogenesis over untreated PHA controls. The role of macrophages and their involvement in the steroid sensitivity of the PHA response is unclear. Evidence reported here indicated that macrophages may be involved as mediators of steroid sensitivity and may therefore limit the extent of their suppressive and/or enhancing activity. In vivo administration of methylprednisolone acetate (MPA) demonstrated that steroids can interfere with the growth and progression of fibrosarcomas in their syngenic BALB/c hosts. The strongest delay in tumor appearance was observed when the steroid was administered 4-7 days post-tumor cell inoculation. It is assumed that after tumor cell inoculation, precursor cells of both suppressor and cytotoxic lymphocytes were entering a proliferative stage to form mature cells. These studies indicated that steroid suppression was directed against a suppressor T cell and possibly acts by preventing its differentiation. It is thought that this suppressor cell acts by inhibiting the lytic function of effector T cells. Thus, by eliminating suppressor T cells, the immune response is capable of eliciting strong anti-tumor immunity. / M.S.

This study was conducted to: (a) determine scrotal circumference (SC) and testicular consistency (tone) of performance tested, yearling beef bulls of various breeds; (b) correlate these values with performance data; (c) attempt, by means of a buyer survey, to evaluate the fertility and overall desirability of the beef bulls sold through the Virginia BCIA Bull Test Stations; (d) study the relationship between several semen characteristics, scrotal circumference, and testicular consistency measurements of yearling beef bulls. Final SC was correlated .60 (P < .01) with initial SC and -.31 (P < .01) with final weak spring tone. Final weak spring tone was correlated .87 (P < .01) with final strong spring tone. Final SC was positively correlated with final weight .44 to .64 (P < .01) and age .40 to .52 (P < .01). Final weak spring tone was negatively correlated with final weight -.35 (P < .01) and age -.30 to -.34 (P < .01). When the least-squares means were calculated for final SC, the final SC of the Angus breed was significantly different from the final SC of the Simmental and Polled Hereford breeds (both P < .01). For the bulls placed on a collection regimen, SC was positively correlated with ejaculate volume, .53 (P < .01) to .57 (P < .05), and with sperm output .55 to .71 (P < .01). No significant correlations were found between the tone measurements and the semen traits. / 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.