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JB/T 7917-1999 滚动轴承 圆柱滚子轴承斜挡圈 外形尺寸

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基本信息
标准名称:滚动轴承 圆柱滚子轴承斜挡圈 外形尺寸
英文名称:Rolling bearings - Cylindrical roller bearings,separate thrust collars - Boundary dimensions
中标分类: 机械 >> 通用零部件 >> 滚动轴承
ICS分类: 机械系统和通用件 >> 轴承 >> 滚动轴承
替代情况:JB/T 7917-1995(原标准号GB 4665-1984);标准内容已被GB/T 20060-2006 涵盖。
发布日期:1999-06-28
实施日期:2000-01-01
首发日期:1900-01-01
作废日期:2010-01-20
归口单位:全国滚动轴承标准化技术委员会
出版日期:1900-01-01
页数:6页
批文号:国机管[1999]365号
适用范围

本标准等同采用 ISO 246:1995《滚动轴承 圆柱滚子轴承斜挡圈 外形尺寸》,是对 JB/T 7917-95《圆柱滚子轴承斜挡圈 外形尺寸》的修订。其修改如下:

前言

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引用标准

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所属分类: 机械 通用零部件 滚动轴承 机械系统和通用件 轴承 滚动轴承
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Product Code:SAE AS649
Title:Hose Assembly, Polytetrafluoroethylene, Metal Braid, Medium Pressure, Flareless, Straight to 90掳
Issuing Committee:G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Scope:No scope available.【英文标准名称】:StandardGuideforDeterminingDNASingle-StrandDamageinEukaryoticCellsUsingtheCometAssay
【原文标准名称】:用彗星分析法测定真核细胞中DNA单线损伤的标准指南
【标准号】:ASTME2186-2002a
【标准状态】:现行
【国别】:
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E47.02
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:损伤;电池;核酸;遗传学
【英文主题词】:biomarker;cellular;Cometassay;DNAdamage;DNAstrandbreaks;stresseffects;toxic
【摘要】:1.1Thisguidecoverstherecommendedcriteriaforperformingasingle-cellgelelectrophoresisassay(SCG)orCometassayforthemeasurementofDNAsingle-strandbreaksineukaryoticcells.TheCometassayisaverysensitivemethodfordetectingstrandbreaksintheDNAofindividualcells.ThemajorityofstudiesutilizingtheCometassayhavefocusedonmedicalapplicationsandhavethereforeexaminedDNAdamageinmammaliancellsinvitroandinvivo(1-4).ThereisincreasinginterestinapplyingthisassaytoDNAdamageinfreshwaterandmarineorganismstoexploretheenvironmentalimplicationsofDNAdamage.1.1.1TheCometassayhasbeenusedtoscreenthegenotoxicityofavarietyofcompoundsoncellsinvitroandinvivo(5-7),aswellastoevaluatethedose-dependentanti-oxidant(protective)propertiesofvariouscompounds(3,8-11).Usingthismethod,significantlyelevatedlevelsofDNAdamagehavebeenreportedincellscollectedfromorganismsatpollutedsitescomparedtoreferencesites(12-15).StudieshavealsofoundthatincreasesincellularDNAdamagecorrespondwithhigherordereffectssuchasdecreasedgrowth,survival,anddevelopment,andcorrelatewithsignificantincreasesincontaminantbodyburdens(13,16).1.2ThisguidepresentsprotocolsthatfacilitatetheexpressionofDNAalkalinelabilesingle-strandbreaksandthedeterminationoftheirabundancerelativetocontrolorreferencecells.TheguideisageneralonemeanttofamiliarizelabpersonnelwiththebasicrequirementsandconsiderationsnecessarytoperformtheCometassay.Itdoesnotcontainproceduresforavailablevariantsofthisassay,whichallowthedeterminationofnon-alkalinelabilesingle-strandbreaksordouble-strandedDNAstrandbreaks(8),distinctionbetweendifferentcelltypes(13),identificationofcellsundergoingapoptosis(programmedcelldeath,(1,17)),measurementofcellularDNArepairrates(10),detectionofthepresenceofphotoactiveDNAdamagingcompounds(14),ordetectionofspecificDNAlesions(3,18).1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatoryrequirementspriortouse.1.3Thisguideisarrangedasfollows:SectionScope1ReferencedDocuments2Terminology3SummaryofGuide4SignificanceandUse5EquipmentandReagents6AssayProcedures7TreatmentofData8ReportingData9Keywords10AnnexA1References

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