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11.
INTRODUCTIONNongreenplastidsofheterotrophictissuesarecarbohydrate importingorganellesand ,inthecaseofamyloplastsofstoragetissues,thesiteofstarchsynthesis.Investigationofwholetissuesfromavarietyofstarchsynthesizingcropplantsindicatedthathexoseunitswereimpo…  相似文献   
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公正是一个含义丰富且用法不一的概念。从政治伦理的角度区分 ,公正有三层涵义。从政府权能讲 ,公正就是正义 ,正义作为一种法理精神体现了制度安排的合理性 ;从社会伦理而言 ,公正就是公平 ,公平主要体现为一种社会利益的分配原则 ;从个体德性讲 ,公正就是正直。三者是一个有机整体 ,共同构成官德建设的灵魂  相似文献   
13.
INTRODUCTIONC2 chiral 1 ,1’ bi 2 naphthol 1occupiesapositionofprimeimportanceinawiderangeofenantioselectivereactions.Itplaysanimportantroleinasymmetricsyntheseswithveryhighen antiomericpurity.Relevantliteraturereportsseveralmethodsforthepreparationofoptical…  相似文献   
14.
Verbal retelling abilities for social studies lectures were examined and compared in 20 adolescent boys, ages 12-5 to 14-7, with language-learning disabilities (LLD) and 29 with normal language abilities (NL). Participants viewed one videotaped social studies lecture with a comparison expository discourse structure and one with a causation discourse structure. Following each lecture presentation, participants verbally retold the lecture. Results of several repeated-measures analyses of variance indicated that the group with LLD produced a significantly smaller number of T-units, subordinate clauses, subordinate clauses per T-unit, T-units per second, lecture components per second, and percentage of lecture components in their retellings, compared with the group with NL, regardless of lecture type. Both groups produced a significantly greater number of T-units and subordinate clauses for the comparison lecture. By contrast, both groups recalled a significantly greater number of lecture components per T-unit and per second for the causation lecture. Results indicated that the comparison discourse structure facilitated more substantive and elaborate retellings, whereas the causation discourse structure facilitated more efficient, concise retellings in both groups. Research and instructional implications are discussed.  相似文献   
15.
INTRODUCTIONThemicropumpiskeycomponentofmicrofluidicsystem .Theintegrationofmicropumpwithothermicrofluidiccomponentscanbewide lyu  相似文献   
16.
Abstract : IncinerationasamethodofreducingMunicipalSolidWaste (MSW)volumeandrecoveryofener gyhasbeendevelopedgraduallyinChina .Moreattentionispaidonpolychlorinateddibenzo p dioxinsandpolychlorinateddibenzofurans (PCDD Fs)formedinMSWincinerationprocess .Thisp…  相似文献   
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INTRODUCTIONAntisenseoligodeoxynucleotides (ASODN )caninhibittranscriptionandinterferewithspe cialgeneexpression .AfixedpointontheK rasgenewithhighmutationrateinpancreaticcarci nomaoffersanintracellulartargetforpancreaticcarcinomagenetherapywithASODN (Cai…  相似文献   
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INTRODUCTIONSince 1 978,China’sfisheryindustryhaswitnessedarapiddevelopmentandannualgrowthof 1 2 %rise .Theoutputofaquaticproductshasbeentoprankingintheworldfor 1 2runningyearssince 1 988whenChinasurpassedJapanin1 998.Lastyear’soutputamountedto 4 1milliontons(National…  相似文献   
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INTRODUCTIONStudiesofsecondlanguageacquisition(SLA)areoftenviewedasbasedonfirstlan guageacquisitionresearch .Infact,peopleusedtoexplainphenomenainSLAwithinstancesandtheoriesderivedfromresearchinfirstlanguageacquisition.However,thereisnowageneralconsensus…  相似文献   
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INTRODUCTIONAftertheKyotoProtocolwassigned ,theworldwiderefrigerationandair conditioningin dustryfaceduptogreatchangesintheenviron mentalproblem .Forautomotiveair conditioning(AAC) ,thecurrentrefrigerant,R 13 4a ,hasbeenregardedasrestricted use refrigeran…  相似文献   
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