Bacteria are frequently found as contaminants in cell cultures. However, cell cultures sometimes lack visual signs of bacterial contamination, e.g. fast decoloration of the medium. Moreover, it has been demonstrated that standard antibiotics are mostly ineffective against resistant bacterial infection but have a strong impact on cell metabolism, growth and differentiation.
Frequent screening of cell cultures for bacterial contamination is therefore indispensable in order to get reliable results. Hence, PromoCell offers a PCR-based Bacteria Test Kit that has been developed for accurate and reliable in vitro diagnosis of 45 bacteria species, many of them usually found as contaminants in cell cultures (e.g. Actinomyces, Bacillus, Enterococcus, Escherichia, Fusobacterium, Klebsiella, Lactobacillus, Micrococcus, Mycobacterium, Pseudomonas, Porphyromonas, Prevotella, Salmonella, Serratia, Legionella, Staphylococcus, Streptococcus, Peptostreptococcus, etc.). The kit provides a highly sensitive, easy and rapid method to detect bacterial infection in various in situ biological materials, including cell cultures. Detection requires as little as 12 bacteria genomes per sample volume. The protocol can be completed within 3.5 hours with a hands-on time of less than 40 minutes. The kit contains all necessary components for setting up a PCR including a positive control DNA as well as an internal control DNA to prove a successfully performed PCR run. The kit does not amplify eukaryotic DNA.
ebiomall.com
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首先，不否认它比大多数国产的试剂盒做得好，提取的纯度、方便度和量，都还很不错。
其次，它是日本的。so我觉得实验室用用天根的，就非常好了。拒绝日货，从实验室做起。
向左转|向右转
TAKARA的RR047A逆转录试剂盒，做逆转录程序设置错误本来应该37℃15min85℃5s，变成37℃15s，85℃
5s，请问再重新设置程序可以吗，85℃酶会全部失活吗？
如果是用转录出的cDNA做那跟平时就一样了。不需要特别的试剂盒、
一、cDNA第二链的合成:
1. 第一链反应完成后,取2ul一链产物－20℃冰箱中保存，待电泳检测。其余的产物合并，混匀，然后顺序加入下列试剂(promega):
20ul 10×DNA Polymerase I buffer
6ul10mM dNTP(自己配制)
xuldd H2O
1ulRNase H(2U/ul)
10ul DNA Polymerase I(10U/ul)
总体系为200ul;
2. 混匀后,16℃反应2.5小时;
3. 70℃灭活10分钟;
4. 反应完成后,得到200ul cDNA第二链反应体系,将此体系置于冰上;
5．取2ul二链产物，同保存的一链产物一起电泳鉴定。同时上1kb ladder，确定双链的大小范围。
注：一链，二链的电泳图是smear，且二链稍比一链大一些。
二、双链cDNA末端补平:
1. 在第二链反应体系中,顺序加入下列试剂(promega):
6ul 10mM dNTP
2ul T4 DNA Polymerase(8.7U/ul)
2ul BSA(10mg/ml)
2. 稍微离心混匀反应物, 37℃反应至少30分钟,然后75℃灭活10分钟;
3. 加入等体积酚/氯仿/异戊醇,剧烈振荡后,常温下13000g离心5分钟;
4. 离心后,吸取上清于另一1.5ml eppendof管中,加入等体积氯仿,上下颠倒几次混匀后,常温下13000g离心5分钟;
5. 吸取上清至另一eppendof管,加入1/10V3M NaAc(PH5.2)和2.5V预冷的无水乙醇,混匀,-20℃放置过夜以沉淀双链cDNA;
6. 第二日,将昨日沉淀物在4℃,13000g离心60分钟以充分沉淀双链cDNA;
7.离心完毕,弃上清,加入1ml 70%乙醇洗涤沉淀,常温下13000g离心5分钟;
8.离心完毕,弃上清,干燥沉淀至无乙醇气味.
注：第3，第4步可以用PCR 纯化试剂盒代替。
PCR纯化试剂盒操作流程：
1．溶液PE使用前应加入适量体积95％－100％的乙醇，混匀。
2．向200ul二链补平产物中加入5倍体积的buffer PB，混匀。
3．加入spin column中，13000rpm离心1min。
4．加入0.75ml buffer PE，13000rpm离心1min。
5．13000rpm，再离心1min。
6．将spin column放入一新的离心管中，加入50ul buffer EB，静置10min。
7．13000rpm离心2min。
8．加入30ul buffer EB，静置10min。
9．13000rpm离心2min。
10．加入1/10体积3M的NaAc，2.5倍体积无水乙醇，混匀，－20℃沉淀过夜。
1.模板提取（一般为RNA）：Trizol、氯仿、异丙醇、无水乙醇、DEPC处理水
2.模板浓度测定：分光光度计或NanoDrop
3.逆转录：逆转录试剂盒（或者一步法试剂盒），这一步可以用普通PCR做，也可以用水域做。
4.荧光定量PCR试剂：通常有用SYBR Green Mix做的，但是这里建议你用EvaGreen做，灵敏度和平行性都要好于SYBR Green，并且如果你那是ABI或者Stratagene的PCR如果用SYBR Green还需要加一步Rox很麻烦。
5.其他：除了以上的那些还需要离心管、PCR管或板（Axygen反应比较好）、移液枪等，暂时就想到这么多。
