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とある魔術の禁書目録のヒロインの一人であり、とある科学の超電磁砲の主人公。<br> 『超電磁砲(レールガン)』の異名を持つ御坂美琴のスレです。<br> 彼女の恋が成就するように祈りつつ、マターリ語りましょう。 <br>CV:佐藤利奈
とある魔術の禁書目録のヒロインの一人であり、とある科学の超電磁砲の主人公。<br> 『超電磁砲(レールガン)』の異名を持つ御坂美琴のスレです。<br> 彼女の恋が成就するように祈りつつ、マターリ語りましょう。 <br>CV:佐藤利奈
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<nowiki>{|</nowiki>表头<br>
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<nowiki>! 标题文字 !</nowiki>标题单元格
<nowiki>| 示例 |</nowiki>内容单元格

2020年5月8日 (五) 16:08的版本

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Dithiothreitol (DTT) is the common name for a small-molecule redox reagent known as Cleland's reagent. DTT's formula is C4H10O2S2 and the molecular structure of its reduced form is shown at the right; its oxidized form is a disulfide-bonded 6-membered ring (shown below). Its name derives from the four-carbon sugar, threose. DTT has an epimeric ('sister') compound, dithioerythritol. A common use of DTT is as a reducing or "deprotecting" agent for thiolated DNA. The terminal sulfur atoms of thiolated DNA have a tendency to form dimers in solution, especially in the presence of oxygen. Dimerization greatly lowers the efficiency of subsequent coupling reactions such as DNA immobilization on gold in biosensors. Typically DTT is mixed with a DNA solution and allowed to react, and then is removed by filtration (for the solid catalyst) or by chromatography (for the liquid form). The DTT removal procedure is often called "desalting.". DTT is frequently used to reduce the disulfide bonds of proteins and, more generally, to prevent intramolecular and intermolecular disulfide bonds from forming between cysteine residues of proteins. However, even DTT cannot reduce buried (solvent-inaccessible) disulfide bonds, so reduction of disulfide bonds is sometimes carried out under denaturing conditions (e.g., at high temperatures, or in the presence of a strong denaturant such as 6 M guanidinium hydrochloride, 8 M urea, or 1% sodium dodecylsulfate). Conversely, the solvent exposure of different disulfide bonds can be assayed by their rate of reduction in the presence of DTT. DTT can also be used as an oxidizing agent. Its principal advantage is that effectively no mixed-disulfide species are populated, in contrast to other agents such as glutathione. In very rare cases, a DTT adduct may be formed, i.e., the two sulfur atoms of DTT may form disulfide bonds to different sulfur atoms; in such cases, DTT cannot cyclize since it has no remaining free thiols. Due to air oxidation, DTT is a relatively unstable compound whose useful life can be extended by refrigeration and handling in an inert atmosphere. Since protonated sulfurs have lowered nucleophilicities, DTT becomes less potent as the pH lowers. Tris(2-carboxyethyl)phosphine HCl (TCEP hydrochloride) is an alternative which is more stable and works even at low pH.
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Dithiothreitol (DTT) is the common name for a small-molecule redox reagent known as Cleland's reagent. DTT's formula is C4H10O2S2 and the molecular structure of its reduced form is shown at the right; its oxidized form is a disulfide-bonded 6-membered ring (shown below). Its name derives from the four-carbon sugar, threose. DTT has an epimeric ('sister') compound, dithioerythritol. A common use of DTT is as a reducing or "deprotecting" agent for thiolated DNA. The terminal sulfur atoms of thiolated DNA have a tendency to form dimers in solution, especially in the presence of oxygen. Dimerization greatly lowers the efficiency of subsequent coupling reactions such as DNA immobilization on gold in biosensors. Typically DTT is mixed with a DNA solution and allowed to react, and then is removed by filtration (for the solid catalyst) or by chromatography (for the liquid form). The DTT removal procedure is often called "desalting.". DTT is frequently used to reduce the disulfide bonds of proteins and, more generally, to prevent intramolecular and intermolecular disulfide bonds from forming between cysteine residues of proteins. However, even DTT cannot reduce buried (solvent-inaccessible) disulfide bonds, so reduction of disulfide bonds is sometimes carried out under denaturing conditions (e.g., at high temperatures, or in the presence of a strong denaturant such as 6 M guanidinium hydrochloride, 8 M urea, or 1% sodium dodecylsulfate). Conversely, the solvent exposure of different disulfide bonds can be assayed by their rate of reduction in the presence of DTT. DTT can also be used as an oxidizing agent. Its principal advantage is that effectively no mixed-disulfide species are populated, in contrast to other agents such as glutathione. In very rare cases, a DTT adduct may be formed, i.e., the two sulfur atoms of DTT may form disulfide bonds to different sulfur atoms; in such cases, DTT cannot cyclize since it has no remaining free thiols. Due to air oxidation, DTT is a relatively unstable compound whose useful life can be extended by refrigeration and handling in an inert atmosphere. Since protonated sulfurs have lowered nucleophilicities, DTT becomes less potent as the pH lowers. Tris(2-carboxyethyl)phosphine HCl (TCEP hydrochloride) is an alternative which is more stable and works even at low pH.

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とある魔術の禁書目録のヒロインの一人であり、とある科学の超電磁砲の主人公。<br> 『超電磁砲(レールガン)』の異名を持つ御坂美琴のスレです。<br> 彼女の恋が成就するように祈りつつ、マターリ語りましょう。 <br>CV:佐藤利奈
下为显示:
とある魔術の禁書目録のヒロインの一人であり、とある科学の超電磁砲の主人公。
『超電磁砲(レールガン)』の異名を持つ御坂美琴のスレです。
彼女の恋が成就するように祈りつつ、マターリ語りましょう。
CV:佐藤利奈

标题

1-5级标题

= 1级标题 = == 2级标题 == === 3级标题 === ==== 4级标题 ==== ===== 5级标题 =====

表格

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{| class="wikitable" |- ! 标题文字 !! 标题文字 !! 标题文字 |- | 示例 || 示例 || 示例 |- | 示例 || 示例 || 示例 |- | 示例 || 示例 || 示例 |}
示例:

标题文字 标题文字 标题文字
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示例 示例 示例

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{| class="wikitable sortable" |- ! 标题文字 !! 标题文字 !! 标题文字 |- | 示例 || 示例 || 示例 |- | 示例 || 示例 || 示例 |- | 示例 || 示例 || 示例 |}
示例:

标题文字 标题文字 标题文字
示例 示例 示例
示例 示例 示例
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{|表头
|-换行 ! 标题文字 !标题单元格 | 示例 |内容单元格