成A人片亚洲日本久久,丰满乳乱亲伦小说,两个小婕子和我做受HD,短篇公交车高H肉辣全集目录

產(chǎn)品展示
PRODUCT DISPLAY
技術(shù)支持您現(xiàn)在的位置:首頁 > 技術(shù)支持 > 細(xì)菌培養(yǎng)方法

細(xì)菌培養(yǎng)方法

  • 發(fā)布日期:2020-08-06      瀏覽次數(shù):3785
    • 細(xì)菌培養(yǎng)方法

      1儀器:

      K罩細(xì)菌過濾效率檢測儀、高壓蒸汽滅菌器、電子天平、生化培養(yǎng)箱、軌道式振蕩器、超潔凈工作臺、菌落計(jì)數(shù)器

      1. 試劑及材料:

      蒸餾水、75%酒精、金黃色葡萄球菌ATCC 6538、胰蛋白酶大豆瓊脂(TSA)、胰蛋白胨大豆肉湯培養(yǎng)基(TSB)、蛋白胨水、酒精燈、90mm平皿、500ml錐形瓶

      1. TSA培養(yǎng)基的配制

      取一個干凈的500ml的錐形瓶,稱取16g TSA,溶于400ml水中,包扎后放入高壓蒸汽滅菌器中滅菌(121℃-123℃,20min),滅菌結(jié)束后取出,待其冷卻至50℃-60℃時,將液體培養(yǎng)基逐個倒25ml左右入無菌培養(yǎng)皿中,操作應(yīng)在超潔凈工作臺上進(jìn)行,以酒精燈的火焰周圍作為無菌區(qū)域,避免雜菌污染。

      待培養(yǎng)基冷卻凝固后,將其倒置放入恒溫培養(yǎng)箱中,37℃條件下培養(yǎng)24h,將有菌落生長的培養(yǎng)基舍棄不用,無雜菌生長的取出備用,盡量現(xiàn)用現(xiàn)做,如不能盡快使用,應(yīng)密封放在4℃冰箱內(nèi)冷藏,可保存3-4天。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

      1. 菌懸液的制備

      將金黃色葡萄球菌ATCC6538接種在已滅菌好的100mlTSB(胰蛋白胨大豆肉湯液體培養(yǎng)基)中,在37℃震蕩培養(yǎng)24h。

      用無菌移液槍取出上述培養(yǎng)好的菌液1ml注入9ml一滅菌好的蛋白胨水中,混勻,一次逐級稀釋10倍,稀釋至10-7(根據(jù)菌種實(shí)際情況來判斷需要稀釋至多少),然后分別取10-5、10-6、10-7菌液各0.1ml接種到備TSA培養(yǎng)基上,每個稀釋稀釋倍數(shù)做少4組平行,用涂布棒沿同一方向涂抹均勻,(不要涂抹到培養(yǎng)皿的邊緣上),放入生化培養(yǎng)箱中培養(yǎng),培養(yǎng)溫度(37±2)℃,培養(yǎng)時間(24±2)h。培養(yǎng)結(jié)束后用菌落計(jì)數(shù)器計(jì)數(shù),根據(jù)稀釋倍數(shù)確定原始菌液的濃度。

      計(jì)算公式:原始濃度=(A/V)*D

      A為培養(yǎng)皿上的平均菌落數(shù)

      V為接種液的體積

      D為稀釋倍數(shù)

      按照上述方法確定原始菌液的濃度后,用1.5%的蛋白胨水將上述培養(yǎng)物稀釋至約5*105cfu/ml。

      TSB的制備:稱取3gTSB, 溶于100ml水中,放入高壓蒸汽滅菌器中(121℃-123℃,20min)滅菌,冷卻后備用。

      蛋白胨水的配制:稱取1.5g蛋白胨溶于100ml水中,包扎,放入高壓蒸汽滅菌器中(121℃-123℃,20min)滅菌,冷卻后備用。

      實(shí)驗(yàn)結(jié)束后逐級取出培養(yǎng)皿并蓋上皿蓋,標(biāo)記后倒置放入恒溫培養(yǎng)箱中,37℃培養(yǎng)24-48h.試驗(yàn)中,陽性對照組應(yīng)進(jìn)行至少兩次實(shí)驗(yàn),終陽性質(zhì)控結(jié)果取平均值。

      培養(yǎng)結(jié)束后,將所有培養(yǎng)皿取出,使用菌落計(jì)數(shù)器進(jìn)行計(jì)數(shù),并將每一級菌落數(shù)對應(yīng)陽性孔轉(zhuǎn)換表進(jìn)行轉(zhuǎn)換,轉(zhuǎn)換后的數(shù)值求和,即得出菌落總數(shù),陽性質(zhì)控值范圍應(yīng)在(2200±500)cfu之間。

      細(xì)菌過濾效率計(jì)算公式如下:

      BFE=(C-T)/C*

      式中:C為陽性質(zhì)控平均值,T為實(shí)驗(yàn)組菌落總和

    聯(lián)系方式
    • 電話

      17321150489

    • 傳真

      021-69003627

    在線客服
    99久久久无码国产精品试看| 做爰高潮A片免费视频一| 99无码熟妇丰满人妻啪啪| 双乳被老汉揉搓A毛片免费观看 | 精品国产麻豆免费人成网站| 人妻少妇被粗大爽9797PW| 波多野结衣人妻厨房大战| 日本少妇被黑人XXXXX| 精品久久久久久无码国产| 国产女爽爽精品视频天美传媒| 欧美,日韩,国产,专区| 成都视频高清完整版在线观看 | 国产女人高潮视频在线观看| 久久综合亚洲色HEZYO国产| 色伦专区97中文字幕| 精品人体无码一区二区三区| 中文字幕丰满孑伦无码精品| 日本理伦片午夜理伦片| 老师你的真嫩真紧AV視頻| SM调教论坛一区| 少妇性饥渴无码A区免费| 成A人片亚洲日本久久| 国产精品亚洲一区二区三区| 又大又紧又粗C死你视频| 男男调教后菊撑开扩张A片 | 17岁日本高清免费观看完整版| 太子从小H后必须夹玉势SM| 呦系列视频一区二区三区| 大肉蒂被嘬的好爽H| 天美传媒年轻的母亲| 欧美人妻精品一区二区三区| 脱了内裤猛烈进入A片视频免费| 欧美性激烈粗大精品XXX| 成人区精品人妻一区二区不卡| 国产麻豆一精品一AV一免费| 亚洲精品无码久久久久去Q| 乱中年女人伦AV三区| 成人网站WWW污污污网站| А√天堂资源官网在线资源 | 一本久道久久综合狠狠躁| 辽宁老妓女叫床高潮|