- ￥599
- Sigma-Aldrich
- 进口
- 81255-250G
- 2026年01月19日
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- 详细信息
- 文献和实验
- 技术资料
- 保存条件：
常温
- 保质期：
根据瓶身LOT号查询
- 英文名：
Poly(ethylene glycol)
- 库存：
有现货
- 供应商：
浙江羽翔生物科技有限公司
- CAS号：
25322-68-3
- 规格：
250G
属性
质量水平
200
产品线
BioUltra
形式
solid
分子量
Mr 5000-7000
杂质
insoluble matter, passes filter test
≤20 mg/kg peroxides (as H2O2)
pH值（酸碱度）
5.5-7.0 (25 °C, 50 mg/mL in H2O)
溶解性
H2O: 50 mg/mL at 20 °C, clear, colorless
痕量阴离子
chloride (Cl-): ≤50 mg/kg
sulfate (SO42-): ≤50 mg/kg
痕量阳离子
Al: ≤5 mg/kg
As: ≤0.1 mg/kg
Ba: ≤5 mg/kg
Bi: ≤5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤200 mg/kg
Li: ≤5 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Mo: ≤5 mg/kg
Na: ≤200 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Sr: ≤5 mg/kg
Zn: ≤5 mg/kg
λ
50 mg/mL in H2O
紫外吸收
λ: 260 nm Amax: 0.15
λ: 280 nm Amax: 0.10
SMILES字符串
C(CO)O
InChI
1S/C2H6O2/c3-1-2-4/h3-4H,1-2H2
InChI key
LYCAIKOWRPUZTN-UHFFFAOYSA-N
一般描述
应用
其他说明
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文献和实验Copper limiting threshold in the terrestrial ammonia oxidizing archaeon Nitrososphaera viennensis.
Ammonia oxidizing archaea (AOA) inhabiting soils have a central role in the global nitrogen cycle. Copper (Cu) is central to many enzymes in AOA including ammonia monooxygenase (AMO), the enzyme involved in the first step of ammonia oxidation. This study explored the physiological response of the AOA soil isolate, Nitrososphaera viennensis (EN76T) to Cu-limiting conditions in order to approach its limiting threshold under laboratory conditions. The chelator TETA (1,4,8,11-tetraazacyclotetradecane N, N', N″, N‴-tetraacetic acid hydrochloride hydrate) with selective affinity for Cu2+ was used to lower bioavailable Cu2+ in culture experiments as predicted by thermodynamic speciation calculations. Results show that N. viennensis is Cu-limited at concentrations ≤10-15 mol L-1 free Cu2+ compared to standard conditions (10-12 mol L-1). This Cu2+ limiting threshold is similar to pure cultures of denitrifying bacteria and other AOA and AOB inhabiting soils, freshwaters and sewage (<10-16 mol L-1), and lower than pure cultures of the marine AOA Nitrosopumilus maritimus (<10-12.7 mol L-1), which also possesses a high amount of Cu-dependent enzymes.
导致错误引发（False priming）。降低引物与模板相似性的一种方法是，引物中四种碱基的分布最好是随机的，不要有聚嘌呤或聚嘧啶的存在。尤其 3' 端不应超过 3 个连续的 G 或 C，因这样会使引物在 GC 富集序列区错误引发。 7、引物自身及引物之间不应存在互补序列 引物自身不应存在互补序列，否则引物自身会折叠成发夹结构（Hairpin）使引物本身复性。这种二级结构会因空间位阻而影响引物与模板的复性结合。引物自身不能有连续 4 个碱基的互补。两引物之间也不应具有互补性，尤其应避免
B1014 ADP,2Na,2H2 O (腺苷-5'-二磷酸腺苷) 100mg/250mg/1g 60/150/500 Sigma分装 B1017 Agar,Bacterological (琼脂粉-细菌培养级) 100g 100 日本分装 B
PRODUCTION OF COMPLETELY ES CELL-DERIVED FETUSES BY AGGREGATION WITH TETRAPLOID
of aggregation plate Materials: Dissecting microscope; Sterile tissue culture dishes (Easy Grip 35 x 10 mm, Falcon 3001-3); 1 ml syringe with 26 G 1/2 needle of KSOM medium; light mineral oil (EMBRYO TESTED) (e.g. Sigma: M8410);
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