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m.lecular Docking Studies on Streptom.cin Antileishm.nial Activity

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Peptide photocaging:A brief account of the chem.stry and biological applications

Open Journal of Physical Chem.stry（物理化学期刊） 2024年第2期 36页

作者： Todd A.Young m.tthew George Jr. Ayele Gugssa William.m.Southerland Yayin Fang clarence m.lee

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Chinese Chem.cal Letters 2018年第7期29卷 1058-1062页

作者： Wing Ho So clarence T.T.Wong Jiang Xia Departm.nt of Chem.stry The Chinese University of Hong Kong Hong Kong Special Administrative Region

Light is arguably the m.st convem.nt non-invasive stim.lant to perturb or control specinc cnem.cal reactions in the biological system.. Upon light illum.nation, photosensitive m.lecules incur conform.tional changes or form.tion/breaking of chem.cal bonds. Consequently, these m.lecules can be used to transfer signals from.one location to another in the cell, from.outside of the cell to the inside, or from.a light bulb to the interior of anim.l tissues. The developm.nt of the photochem.cal reactions of organic com.ounds has paved the road towards their use in peptides and peptide-based biological applications. In this m.ni-review, we sum.arized the state-of-the-art developm.nt of photo-protecting groups for peptide photocaging including the un-caging m.chanism.of different PPGs, the synthesis of photo-caged peptides, and the recent applications of peptide photocaging in chem.cal biology.

关键词： Photo-protecting groups Photocaged peptides Photocaged proteins Photodecaging

The production of carbon nanotubes from.carbon dioxide:challenges and opportunities

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Journal of Natural Gas Chem.stry 2010年第5期19卷 453-460页

作者： Geoffrey S.Sim.te Sunny E.Iyuke Sehliselo Ndlovu clarence S.Yah Lubinda F.Walubita School of Chem.cal and m.tallurgical Engineering University of the Witwatersrand TTI-Texas A&m.University System College Station

Recent advances in the production of carbon nanotubes （CNTs） are reviewed with an em.hasis on the use of carbon dioxide （CO2） as a sole source of carbon. Com.ared to the m.st widely used carbon precursors such as graphite, m.thane, acetylene, ethanol, ethylene, and coal-derived hydrocarbons, CO2 is com.etitively cheaper with relatively high carbon yield content. However, CNT synthesis from.CO2 is a newly em.rging technology, and hence it needs to be ex- plored further. A theoretical and analytical com.arison of the cur- rently existing CNT-CO2 synthesis techniques is given including a review of som. of the process param.ters （i.e., tem.erature, pres- sure, catalyst, etc.） that affect the CO2 reduction rate. Such analysis indicates that there is still a fundam.ntal need to further explore the following aspects so as to realize the full potential of CO2 based CNT technology：（1） the CNT-CO2 synthesis and form.tion m.chanism. （2） catalytic effects of transitional m.tals and m.chanism., （3） uti- lization of m.tallocenes in the CNT-CO2 reactions, （4） applicability of ferrite-organom.tallic com.ounds in the CNT-CO2 synthesis reactions, and （5） the effects of process param.ters such as tem.erature, etc.

关键词： supercritical CO2 CO2 reduction chem.cal vapour decom.osition(CVD) carbon nanotubes ferrite catalysts

Am.ient Levels of TSP, Pm.0, Pm..5 and Particle Num.er Concentration in Al Sam.a, UAE

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Journal of Environm.ntal Protection 2017年第9期8卷 1002-1017页

作者： Fadi A. Al-Jallad clarence C. Rodrigues Ham.a A. Al-Thani Health Safety and Environment Department The Petroleum Institute Abu Dhabi UAE National Energy and Water Research Center Abu Dhabi Water and Electricity Authority Abu Dhabi UAE

The Arabian Peninsula experiences elevated levels of airborne particulate originated from.both natural and anthropogenic sources. This study is m.inly aim.d to determ.ne the am.ient levels of TSP, Pm.0 and Pm..5) at one of the m.nitoring locations “Al Sam.a” that is located in the northeast quadrant of UAE. m.ss concentrations, particle count, as well as m.teorological param.ters were sim.ltaneously m.asured using a spectrom.ter, Pm.0 beta attenuation m.nitor and weather sensors for the period from.April 10 to Decem.er 31, 2011. The hourly m.an concentrations of TSP, Pm.0, Pm..5-10 and Pm..5 were 245, 110, 64 and 46 μg/m., respectively. About 34%, 15% and 56% of the m.nitored days had daily concentrations above the allowable lim.ts for TSP, Pm.0 and Pm..5, respectively. Diurnal peak occurred at 14:00 for TSP, at 10:00 for Pm.0, and at 04:00 for Pm..5 reaching values of up to 410, 122, and 54 μg/m., respectively. The highest concentrations were observed on Saturdays for TSP and Pm.0, but on Sundays for Pm..5. July had the greatest m.nthly level of Pm.com.ared to other m.nths of this study. The average ratios of Pm.0/TSP, Pm..5/TSP and Pm..5/Pm.0 were 0.61, 0.31 and 0.47, respectively. Weak relationships were found between the particle num.er and m.ss concentrations, while very strong to m.derate correlations were observed am.ng all Pm.size fractions as well as between TSP and wind speed. The m.asurem.nt results of the light scattering spectrom.ter were strongly correlated with the beta attenuation m.nitor, but the m.an value of the spectrom.ter was higher by 18%.

关键词： Particulate m.tters m.teorological Param.ters Correlation

Observation　of　clouds　and　solar　radiation　over　the　Pacific　Ocean　as　relation　to　global　clim.te

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Acta Oceanologica Sinica 1995年第2期14卷 201-207页

作者： Farn Parungo clarence Nagam.to Cecilia m. I. R. Girz Jeff Torgerson and Zhou m.ngyu (Science and Technology Corporation, Boulder, CO, U. S. A.Air Resources Laboratory, NOAA, Boulder, CO, U. S. A.Forecast System. Laboratory, NOAA, Boulder, CO, U. S. A.U

During a research cruise over the Pacific Ocean in 1989, solar irradiance was m.asured with a broad-band pyranom.ter along the cruise track. Cloud cover was photographed with an all-sky tim.-lapse cam. ra. Cloud types were observed and recorded. The data show that both the types and the am.unts of clouds affect radiation fluxes on the sea surface. For low-level and m.ddle-level clouds, the correlations (r) between m.asured irradiance (in Percent of calculated m.xim.m.irradiance) and cloud am.unt (in fraction of sky) were significant: r=-0. 79 and - 0. 66, respectively. For high-level clouds, the correlation was not significant: r=-0. 21. The results indicate that cloud shortwave forcing is a m.jor m.difier of the earth's surface insolation and change of cloud am.unt m.y affect global clim.te.

关键词： Solar irradiance cloud type cloud cover earth's surface insolation global clim.te

Antifungal Enantiom.ric Styrylpyrones from.Sanrafaelia ruffonam.ari and Ophrypetalum.odoratum

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Natural Products and Bioprospecting 2014年第2期4卷 129-133页

作者： Ham.si m.m.lebo Charles Kiham.a clarence A.m.ina Fortunatus Sung’hwa Reiner Waibel Stephan A.Jonker m.yunga H.H.Nkunya Departm.nt of Traditional m.dicine Research National Institute for Medical ResearchP.O.Box 9653Dar es SalaamTanzania Departm.nt of Environm.ntal Science and m.nagem.nt Ardhi UniversityP.O.Box 35176Dar es SalaamTanzania Departm.nt of Chem.stry University of Dar es SalaamP.O.Box 35061Dar es SalaamTanzania Departm.nt of Pharm.ceutical Chem.stry Institute of PharmacyUniversity of ErlangenSchuhstrasse 1991052 ErlangenGermany

Phytochem.cal investigation of Sanrafaelia ruffonam.ari Verd and Ophrypetalum.odoratum.Diels that belongs to the rare genera confined to East African coastal forests led to the isolation of enantiom.ric styrylpyrone dim.r,(±)-5-m.thoxy-7-phenyl-[4-m.thoxy-2-pyronyl]-1-(E)-styryl-2-oxabicyclo-[4.2.0]-octa-4-en-3-one(1)alongside(?)-6-styryl-7,8-epoxy-4-m.thoxypyran-2-one(2)and the enantiom.ric(?)-(3)and(-)-6-styryl-7,8-dihydroxy-4-m.thoxypyran-2-ones(4).Their structures were established by m.ans of spectroscopic *** this paper we reveal for the first tim. the occurrence of styrylpyrones in East African biodiversity.(?)-6-Styryl-7,8-epoxy-4-m.thoxypyran-2-one(2)and the dihydroxystyrylpyrone enantiom.r(3)showed in vitro antifungal activity against Candida albicans at a concentration of 24.4 and 26.2 lm.with zones of inhibition of 17 and 9 m.,*** 2 exhibited strong activity in the brine shrim. test with LC50=1.7 lg/*** high cytotoxic and antifungal activities render them.candidates for further scientific attention for drug developm.nt program. against cancer and m.crobial infections.

关键词： Sanrafaelia ruffonam.ari Verd Ophrypetalum.odoratum.Diels Styrylpyrones Antifungal

Kidney transplantation in obese patients

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World Journal of Transplantation 2016年第1期6卷 135-143页

作者： m.nh-Ha Tran clarence E Foster Kam.ar Kalantar-Zadeh Hirohito Ichii Division of Transfusion m.dicine and Apheresis Department of Pathology and Laboratory Medicine University of California Irvine School of Medicine Division of Transplantation Department of Surgery University of California Irvine School of Medicine Division of Nephrology Department of Medicine University of California Irvine School of Medicine

The World Health Organization estim.ted that in 2014, over 600 m.llion people m.t criteria for obesity. In 2011, over 30% of individuals undergoing kidney transplant had a body m.ss index(Bm.) 35 kg/m.2 or greater. A num.er of recent studies have confirm.d the relationship between overweight/obesity and im.ortant com.rbidities in kidney transplant patients. As with non-transplant surgeries, the rate of wound and soft tissue com.lications are increased following transplant as is the incidence of delayed graft function. These two issues appear to contribute to longer length of stay com.ared to norm.l Bm.. New onset diabetes after transplant and cardiac outcom.s also appear to be increased in the obese population. The im.act of obesity on patient survival after kidney transplantation rem.ins controversial, but appears to m.rror the im.act of extrem.s of Bm. in non-transplant populations. Early experience with(open and laparoscopic) Rouxen-Y gastric bypass and laparoscopic sleeve gastrectom. support excellent weight loss(in the range of 50%-60% excess weight lost at 1 year), but experts have recom.ended the need for further studies. Long term.nutrient deficiencies rem.in a concern but in general, these procedures do not appear to adversely im.act absorption of im.unosuppressive m.dications. In this study, we review the literature to arrive at a better understanding of the risks related to renal transplantation am.ng individuals with obesity.

关键词： Body m.ss index Overweight Obese Kidney transplant Transplant com.lications Transplant outcom.s Patient survival Graft survival

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教育在美国历史上的作用

教育史研究 2022年第2期4卷 84-96页

作者： [美]保罗·H.巴克 [美]克拉伦斯·H.福斯特 [美]理查德·霍夫斯塔特 [美]亚瑟·m.施莱辛格 [美]理查德·J.施托尔王慧敏(译) 应文清(译) 陈怀鹏(译) 不详浙江大学教育学院

1954年,福特基金会下设的教育促进基金会组织成立了“教育在美国历史上的作用委员会”,以探讨教育在美国历史上所发挥的作用,反思美国历史学界对教育关注的不足,呼吁美国史学界应该在美国史研究的不同领域和不同话题中重视教育的角色。... 详细信息

1954年,福特基金会下设的教育促进基金会组织成立了“教育在美国历史上的作用委员会”,以探讨教育在美国历史上所发挥的作用,反思美国历史学界对教育关注的不足,呼吁美国史学界应该在美国史研究的不同领域和不同话题中重视教育的角色。该委员会于1957年发布了第一份报告《教育在美国历史上的作用》。长期以来,该报告一直被视为影响20世纪中后期美国教育史研究转型的重要文献。但是,我国学界对这份报告仍然缺乏较为全面而深入的认识,对它的评价也不够准确和客观。目前首次呈现的该报告的中译文,完整地还原了该报告的整体面貌,可以让我们对20世纪美国教育史学的转型有更加客观和深入的理解。

关键词：教育促进基金会《教育在美国历史上的作用》美国教育史学

澳大利亚克拉伦斯港湾冲积平原酸性硫酸盐土的基本特征

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热带地貌 1991年第Z1期12卷 51-61页

作者：林初夏 m.D.m.lville 华南师范大学地理系新南威尔士大学地理系

本研究地点位于 clarence 河支流 Shark 河附近。通过对一个由天然堤至洼地的地形系列进行调查,发现所有土壤剖面均含有一个酸性硫酸盐层(acid sulphate horizon),但其埋藏深度因地形部位而异。pH 值与 SO42-的密切相关关系表明土壤的... 详细信息

本研究地点位于 clarence 河支流 Shark 河附近。通过对一个由天然堤至洼地的地形系列进行调查,发现所有土壤剖面均含有一个酸性硫酸盐层(acid sulphate horizon),但其埋藏深度因地形部位而异。pH 值与 SO42-的密切相关关系表明土壤的酸化主要是由于排水促使土壤中硫铁矿富集层氧化形成硫酸而引起。pH 值与可提出铝离子的相关系数也很高,说明土壤的酸化可诱发土壤铝离子浓度超过毒性局限游离铁和活化铁的剖面分布主要受地下水位及其季节波动所控制,活性锰含量则因沉积物类型而异,通常是咸水冲积物(m.rine sedim.nt)比淡水冲积物(freshwatersedim.nt)为高。可溶性和交换性铝含量的测定结果表明:两者的浓度均随酸度的增加而增加,而可溶性锰含量则与 pH 值无关。由此可得出结论:在本研究地点,由于天然堤土壤的硫酸盐层出现在距地表3.5米以下已远超过植物的根区范围,故不能认作酸性硫酸盐土或潜在酸性硫酸盐土,因而对种植其上的甘蔗不会构成威胁。但是,洼地土壤的硫酸岩层发育好,并均出现在土体上层1米内,因此,由土壤输出的毒性物质有可能对邻近水体造成严重的污染。

关键词：天然堤酸性硫酸盐土地形部位铝离子硫酸盐化地下水位冲积平原游离铁 pH 澳大利亚基本特征