网页Remove the end section of the column. Carrier gas cylinder pressure too low to allow control. Replace the carrier gas cylinder. Increase the pressure. Drifting carrier gas or combustion gas flows. Check the gas controllers. Accumulation of impurities in the column. Check impurity levels in the gas source. Use correct gas purity.

网页Septa. A wide range of serrated and non-serrated septa, and sleeve stoppers are available for use as temporary closures for glassware joints, tubes, bottles, NMR tubes, ampules, and cannulation techniques in air-sensitive chemistry. To protect your valuable contents in the vessels or containers from the atmosphere, our range of septa provide

网页General Purpose Septa for GC. Aijiren’s general-purpose septa are made from an enhanced injection-molded silicone rubber material. The septa material, dark red or gray

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网页The blue septa offer a high-performance cost-effective alternative, offering a good level of inertness and are also recommended for GC applications. Septa come packed in a glass jar, for high purity. Or select the disc format where septa are located in individual pockets for ease of selection and avoids any risk of cross contamination.

网页Specialty Silicone Products (SSP) makes autosampler septa, gas chromatography (GC) septa, bonded caps, magnetic caps, EPA/VOA septa, cap mats, and re-sealable septa. We manufacture our products in Ballston Spa, New York (USA) under strict quality control at our ISO 9001:2008 certified facility. Our silicone septa are platinum-catalyzed for

网页其中，如果'Per base sequence quality' 太差的话，说明数据的质量远没有达到符合要求的Q30或着Q20的比例，这样测到的reads很多碱基是不可信的，对下游的分析结果影响比较大。. 如果'Per base sequence content'参数的结果中出现很大异常的话 (比如碱基G的曲线出现

网页Long Life GC Autosampler Septa are designed for use with GC Autosamplers. The 5, 9, 11 and 11.5 mm diameter Long Life septa are available with our unique prepierced center

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网页The total emission of septa over a 4 h period was also evaluated. The tested septa emitted 39 different compounds, which are mainly hydrocarbons, alcohols, and ketones. Acetone and toluene are the most abundant out-gassing products. The concentration of acetone was in the range from 55 to 694 ppb for butyl-PTFE septum (brand 14) and butyl

网页2012/03/16 · Evaluations of the septa were based on the performance of the organochlorine compounds, endrin and 4,4'-DDT. These two compounds act as general indicators for the overall inertness of the GC

网页However, high quality septa without any emission are still desirable. Acknowledgements This work was supported by the Polish Ministry of Sciences and High Education (grants no. NN204 322137 for the 2009–2011 period and NN204026238 for the 2010–2013 period) and the Foundation for Polish Sciences (FNP) and the Professor's Subsidy, “Mistrz”.