| Source | Human 293 cells | M.W. | 24.6 kDa | CAS No. | |
|---|---|---|---|---|---|
| Structural Info | |||||
| Formulation | Lyophilized in sterile filtered solution of PBS, pH7.4, 10% trehalose (stabilizer) | ||||
| Reconstitution | Before reconstitution, werecommend a brief spin to drive down any material dislodged from the bottom ofthe tube. The lyophilized protein shouldbe reconstituted in sterile H2O. Further dilutions should be made in buffer or medium containing carrierproteins, such as albumin or serum. | ||||
| Stability | The lyophilized protein isstable for at least 1 year if stored at -80 °C. Reconstituted protein is stable for at least 1 month at 4 °C, but shouldbe stored in aliquots at -80 °C for longer term. Avoid repeated freeze/thaw. | ||||
| Purity | Greater than 95% by SDS-PAGE | ||||
| Biological Activity | The activity was determined by using a reporter gene assay in human 293 cells for the inhibition of activity of BMP4 (2.5 ng/mL).The EC50 ranges from 25 - 100 ng/mL. | ||||
| Country of Origin | USA | ||||
Noggin has been shown to be ahigh-affinity binding protein to BMP and antagonizes BMP bio-activities. It can be added to cell culture medium forembryonic stem cells to maintain pluripotency.The recombinant human Noggin comprises 216 aminoacids after removal of the signal peptide and has a predicted molecular mass of24.6 kDa. As a result of glycosylation, itmigrates as an approximately 30 kDa band in SDS-PAGE under reducing conditionsStemRD"s Noggin ismade in human 293 cells, which renders human-specific post-translationalmodifications. We purified this product through a series ofchromatography.
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谢谢各位!
不过制冰机里的冰不可以,那冰怎么得到呢?
protocol上面说在离心菌液的时候离心管里面要有1/2的冰啊,这个冰应该是碎冰而不是直接冻出来的整块的冰吧。
大家是怎么得到的呢?谢谢!!
制冰机原理:
制冰机是一种将水通过蒸发器由制冷系统制冷剂冷却后生成冰的制冷机械设备。根据蒸发器和生成过程方式原理不同,生成的冰的形状也不同,人们一般根据冰形状将制冰机分为颗粒冰机、片冰机、板冰机、管冰机、壳冰机等等。
制冰机的分类:
按冰的形状可分:鳞形片冰机,雪花制冰机,条冰机,板冰机,块冰机(可分食用小块冰机和工业用大块冰机),冰粒机,颗粒机,管冰机,子弹头制冰机。
实验室制冰机种类选择:
我们平时在外面就餐时,经常看到商家在饮料中加入冰块,有时候是方块的,有时候是中空的,还有在菜市场买海鲜的时候也会看到下面铺着一层冰,究竟有什么区别吗?我们在开展实验室工作的时候,应如何选择制冰机呢?
实验室制冰机主要是用于在开展生命科学相关实验时,给样品提供冰浴环境,防止样品(如核酸、蛋白)因为温度的变化导致降解或变质,从而保障实验结果的准确性和有效性。绝大部分的时候,我们的样品是放在EP管、离心管、pcr管等容器里面,然后把样品管插在冰浴中,靠接触来实现温度的保持。由于样品和冰无法直接接触,而是要通过管壁来传输,所以管壁和冰浴的接触面积是冰浴效果的保障,为了更好的保障样品,应尽量的扩大管壁和冰浴的接触面积。
针对以上考虑,实验室制冰机一般选择雪花制冰机,该种类型的制冰机生产出来的冰呈雪花状碎冰,由于颗粒很小,可以和管壁进行密切的接触,保障冰浴效果。
对于出冰的具体要求中,还有一点是非常重要的,出来的雪花冰要求有15-25%的含水量,这样可极大的提高冰浴和管壁的接触效果。
文章来源:厦门国仪科学仪器有限公司

