物资采购工作的特点及要求

~~Theoretical study of Structural and analytical potential energy functions of GaN[1]D.L.Luo,D.Q.Meng,Z.H.Zhu,Acta Phys.Sin.52[2003]2438. [2]H.Y.Wang,Z.H.Zhu,Chin.Phys.12[2003]154. [3]P.Waltereit,O.Brandt,A.Trampert,H.T.Grahn,J.Menniger,M.Ramsteiner,M.Reiche,K.H.Ploog,Nature406[2000]865. [4]Z.H.Zhu,H.G.Yu,Molecular structure and molecular potential function,Science Press,Beijing1997.…     

新疆鼓藻类(Desmids)植物新记录种

2010年6月～7月,在新疆库车大、小龙池设6个样点,所采集的藻类标本经过鉴定,发现有新疆未记录的鼓藻类植物15种,隶属于4属,包括7种8变种,分别是Closterium acerosumvar.acerosum,C.acerosumvar.angolense,C.attenuatum,C.ehrenbergii var.malinvernianum,C.ehren-bergii var.pseudopodolium,C.incurvum,C.lanceolatumvar.lanceolatum,C.nasutum,C.praelon-gum,C.pseudolunula var.major,C.sigmoideum,C.strigosum var.strigosum,Pleurotaeniumtruncatum,Cosmarium undulatum var.minutum和Euastrum bidentatum等,并描述了其形态学特征.     

河南玉兰属二新种

描述了河南木兰科Magnoliaceae玉兰属Yulania Spach的两个新品种,即:莓蕊玉兰(Yulania fragar-igynandria T.B.Zhao Z.X.Chen et H.T.Dai,sp.Nov)和大别玉兰Y.dabieshanensis T.B.Zhao Z.X.Chenet H.T.Dai,sp.nov.ined.莓蕊玉兰叶倒卵圆状椭圆形,背面灰绿色,基部心形、圆形,稀楔形.玉蕾顶生,或腋生,大,陀螺状,或卵球状(基部短柱状,长8～12 mm),长2.0～3.0 cm,径2.0～2.5 cm;芽鳞状托叶花前脱落.单花具花被片9～18枚,花瓣状,花被片外面中部以下中间亮紫红色;有时具1～3枚肉质、披针形、亮紫红色花被片.雌雄蕊群大,草莓状,径1.8～2.3 cm,有时具2～5枚雌蕊群而特殊.大别玉兰叶椭圆形及菱萼状—卵圆形.有4种花型.     

四川溲疏属的分类研究 （Ⅱ）：种的简介及新分类群

介绍了四川溲疏属植物20种,5变种及1栽培变型,每种均有文献考证、学名订正、特征集要及产地和生境,新分类群D.leiboeneie P.He et L.C.Hu, D.piloea var.longiloba P.He et L.C.Hu,D.jinyangensis P.He eL L.C.Hu及D.longifolia var.deneitomentosa P.He et L.C.Hu均有详细拉丁文描述并附模式标本照片,还记录了两个四川省新分布种:D.bodiaieri Rehd.,D.rehderiana C.K.Schn.,对伞花亚组Subsect Cymosae Rehd.中建立的新系(Ser.Multiradiatae P.He,Ser.Pauciradiatae P.He)作了拉丁文补充描述。     

中国黑腹果蝇种组的组成与分布

1999~2004年,对全国27个省市的果蝇进行调查的结果表明:中国黑腹果蝇种组由10个种亚组组成,共67种.其中包括6个新种(D.sp.likeelegans,D.sp.likeauraria,D.sp.liketrapezifrons1,D.sp.liketrapezifrons2,D.sp.liketakahashii,D.chayusp nov);4个新记录种(D.giriensis,D.ogumai,D.ohnishii,D.pseudobaimaii);6个广布种(D.auraria,D.kikkawai,D.melanogaster,D.simulans,D.suzukii和D.takahashii).分布于全国33个省市,垂直分布的海拔高度在3 000 m以下.     

河南《鸡公山木本植物图鉴》增补(Ⅱ)——河南玉兰属两新种

描述了河南玉兰属Yulania Spach两新种:两型玉兰Y.dimorpha T.B.Zhao et Z.X.Chen,sp.nov.和信阳玉兰Y.xinyangensis T.B.Zhao,Z.X.Chen et H.T.Dai,sp.nov..两型玉兰形态特征是:叶2种类型,玉蕾2种类型.花2种类型:①单花花被片9枚,有萼、瓣之分,瓣状花被片先端具喙,边部明显波状起伏;②单花花被片9枚,花瓣状,先端无喙,边缘微波状起伏.信阳玉兰的形态特征是:叶宽倒卵圆状三角形,先端最宽,通常微凹,或具短尖头,有时2裂,或具3个短三角状尖头.玉蕾顶生,小,卵球状,或短柱状.花喇叭型,单花花被片6～9枚,匙形.     

利用ISSR分子标记研究樱桃李野生类型的遗传多样性及亲缘关系

利用ISSR分子标记技术对产于中国天山的40个樱桃李(Prunus divaricata Ldb.)野生类型遗传多样性进行研究。通过遗传多样性研究及UPGMA聚类分析显示,野生樱桃李种下类群间遗传多样性有差异,平均多样性指数(I)为0.488,遗传相似系数(Hs)介于0.504~0.851之间,平均为0.678,遗传距离(GD)的范围在0.127 0~0.604 2之间,等位基因数(Na)和有效等位基因数(Ne)分别为1.908和1.571,而平均Nei基因多样性指数为0.17,平均Shannon信息指数(I)为0.22则显示其群体遗传多样性较低;分子标记下的聚类结果,可将中国天山产的40个樱桃李野生类型归为4大类,结合形态学特征分析,研究表明中国天山的40个野生樱桃李可划分为4个变种,即矮生樱桃李P.divaricata var.humila(N.R.Cui et L.Wang)D.F.Cui,comb.nov.、黑果樱桃李P.divaricata var.nigrooarp(N.R.Cui et L.Wang)D.F.Cui,comb.nov.、红果樱桃李P.divaricata var.phoenicea(Z.Xu)D.F.Cui,comb.nov.和黄果樱桃李P.divaricata var.luteola(N.R.Cui)D.F.Cui,comb.nov.。     

中国春蜒新种及珍稀种记述,Ⅰ(蜻蜒目:春蜒科)

本文是对作者于1990年出版的《中国春蜓分类》一书作修订补充系列著作的第一篇,内有:(I)GOMPHINAE:(1)Davidius属合胸前面具7字形纹种类厘订,含:1.D.truncus Chao,sp.nov.=D.fruhstorferi junior Chao 1954(部份),=D.f.serenus Asahina 1956(部份);2.D.fruhstorferi Martin,=Gomphus junior Navas 1936,syn.nov.,=D.f.junior Chao 1954(部份);D.f.serenus Asahina 1956(部份),=D.f.guizhouensis Chao et Liu 1990,syn.nov.,=D.f. simaoensisZhou 1992,syn.nov.;3.D.trox Needham重新描述,(?),新配模,(?);4.D.squarrosus Zhu;5.D.zhoui Chao,sp.nov,=D.trox Zhou 1986,非Needham 1931,误订,=D.trox Yang et Davies1993,非Needham 1931.误订.(2)Trigomphus lautus Needham重新描述,(?),新配模,(?).(3)Anisogomphus anderi Lieftinck稚虫描述.(Ⅱ).ONYCHOGOMPHINAE:(4)Nihonogomphus为2亚属,Nihonogomphus Oguma(s.s.)雄性阳茎无后叶,含有bequaerti Chao 1954,Chaoi Zhou et Wu1992,lie fiincki Chao 1954,montanus Zhou et Wu 1992,semanticus Chao 1954,silvanus Zhou et Wu1992,simillinus Chao 1982,thomassoni(Kirby)1990,viridis Oguma 1926(亚属模式种).Lobogomphus Chao,subgen,nov.,含有brevipenn     

取自深海的泥泞微生物

SubmarinemissionfindslifeinthedeepesttrenchonEarth.TheirhomeliesfurtherbeneathsealevelthanEverest'speakrisesaboveit.Andyettinyor鄄ganismshavebeenfoundlivingattheverybottomofthePacificOcean'sdeepesttrench,there鄄motestspotontheglobe.Themicroscopicorganisms,calledforaminifera,liveinmudatthebottomofChallengerDeepintheMarianaTrench,almost11kilometresbeneaththewavesofthewesternPacificOcean.Thepres鄄sureatthisdepthisacrushing1,090timesthatatthesurface.ResearchersledbyHiroshiKitazatooftheJapanA…     

Biomedical Application of Laser

INTRODUCTIONLasershaverevolutionizedresearchanddevelopmentinmedicineanddentistry .Theyhaveledtode velopmentandproductionofmanynewproducts .Laserapplicationsindiagnosis,treatmentandsurgeryareenormousandhaveledtospeedyandmoreefficientresults,aswellasbetterandquickerhealingProcesses.Theapplicationscouldbeclassifiedintermsofareasofusesorintermsofinstruments/products.Inthispa per,discussionswillnotbegroupedinaparticularfashion ,butwi1lbeonspecificapplications .Alotofin formationontheseapplica…     

水杨酸对NaCl胁迫下水稻种子萌发和幼苗生长的影响

在 Na CL胁迫下 ,对水稻种子萌发和幼苗生长进行培养的试验结果显示 ,9g· L-1Na Cl胁迫水稻种子萌发受到抑制 .Na Cl胁迫的同时 ,分别添加 0 .0 2 ,0 .0 5 ,0 .1 0 ,0 .1 5和 0 .2 0 g· L-1的水杨酸 ,水稻种子的发芽率、发芽指数、活性指数、芽长和根长均降低 ,幼苗丙二醛含量增加 .0 .0 2 ,0 .0 5 ,0 .1 0 ,0 .1 5和 0 .2 0 g· L-1的水杨酸没有缓解 9g· L-1Na Cl的抑制作用 .     

川西北泥盆系沙窝子组碳酸盐岩特征及用途

川西北龙门山地区泥盆纪沙窝子组碳酸盐岩分布广泛,资源量丰富,通过碳酸盐岩各类特征分析,对其用途进行了探讨,能够有效提高碳酸盐岩资源利用效率。沙窝子组碳酸盐岩包括灰岩和白云岩,灰岩CaO含量50. 89%～55. 27%,MgO含量0. 12%～0. 99%,SiO_2含量0. 62%～3. 73%,SO3含量0. 02%～0. 087%,K_2O+Na_2O为0. 035%～0. 098%,可满足水泥、建筑、冶金等各类用途。白云岩Ca O含量28. 19%～35. 06%,MgO含量16. 27%～21. 12%,SiO_2含量0. 24%～7. 07%,SO_3含量0. 020%～0. 76%。碳酸盐岩(灰岩+白云岩)饱和抗压强度在35～75 MPa之间,压碎值8. 2%～10. 9%,坚固性指标2%～4%,碱集料反应14 d膨胀率为0. 009%～0. 014%;总α值为3. 50×102～3. 52×10~2Bq/kg,总β值为1. 62×102～1. 76×10~2Bq/kg;内照指数小于0. 08,外照指数小于0. 06;所有指标均符合建筑石料用标准。     

The 5′ untranslated region of fruA mRNA in Myxococcus xanthus positively regulates the expression of its own gene

Studyingthemolecularmechanismsgoverningmorphogenesisofmulticellularstructureandcelldifferen-tiationhasbeenoneofthecentralthemesinlifesciences.M.xanthus,aGram-negativebacterium,isoneofthesim-plestorganismsthatundergoaprogramofmulticellulardevelopment.Inresponsetonutrientstarvation,approxi-mately100000cellsmovetowardanaggregationcentertoformafruitingbody.Withinthenascentfruitingbody,rod-shapedcellsgraduallyshortenanddifferentiateintoroundmyxospores.Sporesgerminatetoinitiatevegetativegrowthifnut…     

广义Smash-双积LW(△△)RH的映射刻画

作为Smash积和Smash余积的推广,S. Caenepeel, B. Ion, G. Militaru和S. Zhu给出了R-smash积, W-smash余积和广义Smash-双积的概念. 本文讨论了广义Smash-双积的一些性质,通过引进广义相容映射系统概念,给出了广义Smash-双积的映射刻画. 推广了D.E. Radford关于Smash-双积的相应结论.     

Physiological response of natural C.taklimakanensis B.R.Pan et G.M.Shen to unconfined groundwater in the hinterland of the Taklimakan Desert

Calligonum. taklimakanensis B.R.Pan et G.M.Shen is an indigenous species that grows in the Taklimakan Desert. This study shows the relationship between C.taklimakanensis B.R.Pan et G.M.Shen and water conditions in the hinterland of the desert. The results show that: (1) Depth of water table is an important factor that affects water potential (ψp, ψA), osmotic potential (ψsat, ψtlp), relative water content (RWCtlp, ROWCtlp), and transpiration rate. (2) The degree of mineralization has a significant impact on the water potential of plants. A high degree of mineralization can strongly reduce plant productivity. (3) C. taklimakanensis B.R.Pan et G.M.Shen reduces the temperature of assimilation sticks through a high transpiration rate and maintains relatively high water content to adapt to drought and hot weather conditions in the hinterland of the desert. In addition, C. taklimakanensis B.R.Pan et G.M.Shen adapts to the water status in the desert through self-regulation or even sacrificing productivity.     

3期评刊表

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科技一生，营销一生，欢喜一生 访欢喜大师解仑

"来自蒙古.祖籍山东,生于上海,长于台湾,求学美国.工作美德,回到上海,死于中国."这是解仑为自己写的墓志铭.也是他的足迹.然而记者为他总结了另外三句话:科技一生,营销一生.欢喜人生.科技是一种物质性的贯穿.营销是行为中无处不在的精髓,欢喜则是一种生活态度.     

南湖污染源解析与污染负荷核算

南湖是武汉市"四水共治"行动计划中需要优先实施水环境提升的水体,其水环境功能区划目标为地表水Ⅳ类,但其现状水质一直处于Ⅴ类或劣Ⅴ类,常年达不到水功能要求,亟需治理.通过对南湖污染源进行解析,核算污染负荷,确定了排口是南湖最大的污染源,其对COD、NH3-N、TP的贡献量分别为550. 2 t/a、60. 3 t/a和7. 8 t/a,负荷比分别为67. 4%、71. 4%和70. 3%.其次为城市径流污染,其对COD、NH3-N、TP的贡献量分别为153. 01 t/a、15. 30 t/a和3. 06 t/a,负荷比分别为18. 8%、18. 1%和27. 6%.再次为降尘污染,其对COD、NH3-N、TP的贡献量分别为112. 4 t/a、8. 7 t/a和0. 2 t/a,负荷比分别为13. 8%、10. 3%和1. 8%.最后为农田种植污染,其对COD、NH3-N、TP的贡献量分别为0. 6 t/a、0. 1 t/a和0. 03 t/a,负荷比分别为0. 1%、0. 2%和0. 3%.     

Evolution of stomatal and trichome density of the Quercus delavayi complex since the late Miocene

A fossil oak species,Quercus tenuipilosa Q.Hu et Z.K.Zhou,is reported from the upper Pliocene Ciying Formation in Kunming,Yunnan Province,southwestern China.The establishment of this species is based on detailed morphologic and cuticular investigations.The fossil leaves are elliptic,with serrate margins on the apical half.The primary venation is pinnate,and the major secondary venation is craspedodromous.The tertiary veins are opposite or alternate-opposite percurrent with two branches.The stomata are anomocytic,occurring only on the abaxial epidermis.The trichome bases are unicellular or multicellular.The new fossil species shows the closest affinity with theextant Q.delavayi and the late Miocene Q.praedelavayi Y.W.Xing et Z.K.Zhou from the Xiaolongtan Formation of the Yunnan Province.All three species share similar leaf morphology,but differ with respect to trichome base and stomatal densities.Q.tenuipilosa.Q.praedelavayi,and Q.delavayi can be considered to constitute the Q.delavayi complex.Since the late Miocene,a gradual reduction in trichome base density has occurred in this complex.This trend is the opposite of that of precipitation,indicating that increased trichome density is not an adaptation to dry environments.The stomatal density(SD)of the Q.delavayi complex was the highest during the late Miocene,declined in the late Pliocene,and then increased during the present epoch.These values show an inverse relationship with atmospheric CO_2 concentrations,suggesting that the SD of the Q.delavayi complex may be a useful proxy for reconstruction of paleo-CO_2 concentrations.     

英语词汇教学探微

词汇是语言的基本要素之一,词汇教学是英语教学中的重要一环,在词汇教学中要注意十个方面的问题1.词音和词形相结合,2.分析词的结构,3.分析词的意义,4.注意词形和词义相结合,5.注意词义联想,6.归纳分类,7.英语释义,8.词语替换,9.在语境中学习词汇,10.练习促记忆.