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   [ zeolite ] 的翻译结果: 查询用时:0.304秒
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zeolite
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    POSITRON ANNIHILATION IN ZEOLITE Y
    Y沸石中的正电子湮没
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    Studies on the Acidity of Zeolite Y
    Y沸石的酸性
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(1) Cytochrome c containing 0.43% iron has been obtained from beef, pig or horse heart muscles by direct adsorption of the neutralized trichloroacetic acid extracts of heart muscle on the cation exchanger"synthetic zeolite" followed by elution with 3.84 M ammonium sulfate and precipitation with 20% trichloroacetic acid. This provides a simple method for large-scale preparation of pure cytochrome c. (2) The ratio of optical densities at 550 mμ(reduced) and 278 mμ of 0.43% iron cytochrome c varies, with...

(1) Cytochrome c containing 0.43% iron has been obtained from beef, pig or horse heart muscles by direct adsorption of the neutralized trichloroacetic acid extracts of heart muscle on the cation exchanger"synthetic zeolite" followed by elution with 3.84 M ammonium sulfate and precipitation with 20% trichloroacetic acid. This provides a simple method for large-scale preparation of pure cytochrome c. (2) The ratio of optical densities at 550 mμ(reduced) and 278 mμ of 0.43% iron cytochrome c varies, with its degree of reduction, from 1.13 to 1.26. The average ratio of our preparations is 1.23. (3) The absorption spectra(230-600 mμ) of oxidized and reduced cytochrome c have been measured. The molecular extinction coefficient at 550 mμ of oxidized, 0.43% iron, cytochrome c is 0.80×10~4. This value differs considerably from that reported in the literature. (4) Some enzymic properties of cytochrome c containing 0.43% iron are compared with those of a preparation containing 0.34% iron and are found to be identical. Both can be converted into''endogenous" cytochrome c. (5) Whether pure cytochrome c contains more than 0.43% iron has been discussed. It seems that no convincing evidence has been presented to show that cytochrome c preparations with iron content higher than 0.43% as obtained by some workers do not contain a small amount of iron-rich impurity.

(一)用陽離子交换劑(synthetic zeolite)直接吸附高等動物心肌抽提液一次,並用3.84M硫酸銨作洗脫劑,即可製得含鐵量0.43%的細胞色素c。因此提供了一個大量製備純細胞色素c的簡單方法。 (二)含鐵量0.43%的細胞色素c,它的550mμ和278mμ光密度的比值,視產品的還原程度而定,其範圍從1.13到1.26,我們所製得的產品,其比值在1.23左右。 (三)我們测量了氧化及還原的細胞色素c(含鐵0.43%)從230mμ到600mμ的吸收光譜,並發現和前人所報告的略有不同。氧化細胞色素c在550mμ的消光係數為0.80×10~4,此值與文獻上的數值相差很多。 (四)我們比較了含鐵量0.43%的細胞色素c和含鐵量0.34%的細胞色素c的一些酶性質,證明他們是相同的;並且兩者都可以變成“內源”細胞色素c。 (五)我們認為現有的實驗證據不足以說明純細胞色素c的含鐵量大於0.43%。

Using water geass as silica source, the synthesis of Y-type zeolite molecular sieve was studied. By addition of nucleation centers and reduction of basicity of reaction mixture, NaY zeolite molecular sieve having silica to alumina mole ratio >4 was readily obtained from a aqueous mixture of Na aluminate and water glass. As shown by experimental results, this method has advantages of reducing the cost of raw materials, shortening the period of synthesis and giving good reproducibility. The nature...

Using water geass as silica source, the synthesis of Y-type zeolite molecular sieve was studied. By addition of nucleation centers and reduction of basicity of reaction mixture, NaY zeolite molecular sieve having silica to alumina mole ratio >4 was readily obtained from a aqueous mixture of Na aluminate and water glass. As shown by experimental results, this method has advantages of reducing the cost of raw materials, shortening the period of synthesis and giving good reproducibility. The nature and role of the nucleation centers were also discussed.

本工作研究了以水玻璃作为二氧化硅原料合成Y型沸石分子筛。采用添加晶核中心和降低反应混合物碱度,由水玻璃和铝酸钠的水混合物很易制得硅铝比大于4的NaY沸石分子筛。实验结果表明,这个方法具有原料价廉,合成周期短和重复性好的优点。对于晶核中心的性质和作用还作了讨论。

Using water geass as silica source,the synthesis of Y-type zeolite molecular sieve was studied.By addition of nucleation centers and reduction of basicity of reaction mixture,NaY zeolite molecular sieve having silica to alumina mole ratio>4 was readily obtained from a aqueous mixture of Na aluminate and water glass.As shown by experimental results,this method has advantages of reducing the cost of raw materials,shortening the period of synthesis and giving good reproducibility.The nature and role...

Using water geass as silica source,the synthesis of Y-type zeolite molecular sieve was studied.By addition of nucleation centers and reduction of basicity of reaction mixture,NaY zeolite molecular sieve having silica to alumina mole ratio>4 was readily obtained from a aqueous mixture of Na aluminate and water glass.As shown by experimental results,this method has advantages of reducing the cost of raw materials,shortening the period of synthesis and giving good reproducibility.The nature and role of the nucleation centers were also discussed.

本工作研究了以水玻璃作为二氧化硅原料合成 Y 型沸石分子筛。采用添加晶核中心和降低反应混合物碱度,由水玻璃和铝酸钠的水混合物很易制得硅铝比大于4的 NaY 沸石分子筛。实验结果表明,这个方法具有原料价廉,合成周期短和重复性好的优点。对于晶核中心的性质和作用还作了讨论。

 
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