三价

It includes the following steps: extract trivalent iron ion and divalent iron ion in water phase through organic extractant, get predecessor of; absterge it with secondary distilled water for2-3 times and get pure load metal predecessor of organic phase; mix organic phase of Mg2 and Fe3 with mol rate of 1:2 and introduce them into autoclave, add distilled water according to the rate of 3:1 or 4:1 of organic phase and water phase and airproof it, and then mix it fiercely, stripping with hydrothermal method at temperature between 200 degree C and 300 degree C and make them react for 2.5 hours; cool it to the room temperature under natural condition, separate liquid and centrifugalize it, absterge it with absolute alcohol for 2-3 times and dry it at temperature of 50 degree C for 30-180 minutes, then get product of magnesium ferrite.

包括如下步骤：通过有机萃取剂来萃取水相中的三价铁离子和二价镁离子，制得有机相前驱物；用二次蒸馏水洗涤2-3次，获得纯净的负载金属有机相前驱物；按照Mg 2 和Fe 3 摩尔比1∶2将有机相混合均匀后引入高压釜中，按照有机相与水相的比例为3∶1或4∶1加入蒸馏水，密封后，对溶液进行强力搅拌，水热反萃的温度在200-300℃之间反应2.5小时；自然冷却至室温，分液，离心分离，用无水乙醇洗涤2-3次，在50℃下干燥30-180分钟，得铁酸镁产品。

Morphologically, the two hexaploids are characterized by the general gigantic appearance, diagnostic of the enhancing growth in horizontal direction of such organs as leaves, stems, various compone...

它们在减数分裂时的单价体数目比三倍体显著地减少了，但另外却有少量三价体和四价体出现。

Simultaneously, the total extractible myoglobin decreased and the proportion of metmyoglobin increased significantly when the pressure above 400MPa. Beef discoloration after pressure processing may result from oxidation of ferrous myoglobin to ferric metmyoglobin, globin denaturation and structural changes. At 40℃, the changes of beef color was similar to that of room temperature's. When the temperature rise to 60℃, most of muscle proteins denatured, a small quantity of native myoglobin could not affect the color of beef significantly. Therefore, protein denaturation was attributed to the main cause of discoloration in beef muscle after pressurization at 60℃.

压力处理导致色泽变化的直接原因可能是由于二价铁的肌红蛋白氧化成三价铁的高铁肌红蛋白、球蛋白的变性及结构的变化所致。40℃时的压力处理，色泽的变化规律与室温下相似，只是色泽变化的程度更为剧烈，蛋白质变性在色泽变化中起到的作用逐渐加强。60℃下的压力处理，绝大部分蛋白质发生变性，少量未变性的肌红蛋白对色泽不会产生明显的影响，此温度的压力处理，蛋白质变性是造成肌肉失去红色的主要原因。

Recently, since hexavalent chromium has bad effects on environment, etc., research on the trivalent chromium plating has been accelerated.

近年来，由于六价铬对环境等方面带来污染影响，于是加紧了对三价铬电镀的研究。

The amounts of iron bacteria in the distribution system water and the water from each treatment processes were determined by Most Probable Number and Plate Counts methods.

铁细菌一般生活于含氧少但溶有较多铁及二氧化碳的水中，能在氧化二价铁成三价铁化合物的过程中起催

The genes of hammerhead ribozymes targeted against two and three sites on negative strand of potato spindle tuber viroid were designed, synthesized and cloned according to the action manner of hammerhead ribozyme.

根据锤头型核酶的作用模式，设计、合成并克隆了特异切割马铃薯纺锤形块茎类病毒负链RNA不同区域位点的双价和三价锤头型核酶基因。

Mainly engaged in plastic plating technology research, development, production and processing, the company's main products are copper, bronze plating, nickel, nickel-plated black, and the plating of trivalent chromium 6 Trivalent chromium, and so on.

永翔五金塑胶有限公司主要从事塑胶电镀技术的研究、开发、生产及加工，目前公司主要产品有镀铜、镀古铜、镀镍、镀黑镍、镀三价铬及六价铬等。

In addition, UE/HPLC/ICP-MS equipped with anion exchange column to speciate Cr and Cr in the μg/L level. H2 and He were used as collision gas in the ICP-MS detection to reduce the interference of multiatomic ions for Cr-52 ion monitoring.

又为继续提高灵敏度，本研究也使用超音波震荡/阴离子交换管柱的高效能液相层析/感应耦合电浆质谱法将三价铬及六价铬分离，并且将侦测范围降低至μg/L。

The results show that compared with Cr coating, Cr plating possesses many advantages, such as high efficiency, high throwing power, high covering power, low toxicity. However, maintenance of the bath is complex and frequent.

结果表明：与六价铬电镀工艺相比，三价铬电镀工艺具有低毒性、常温施镀、电流效率高、生产效率高、镀层性能好等优点，但其调整维护相对频繁、复杂。

On the other hand, the higher contents of hematite would not necessarily make the rocks red-colored, due to the suppression by other pigments, such as organic matter in black or ferrous iron of chlorite in green.

总体而言，浅红色岩层含有最高的总铁含量和赤铁矿铁，灰色岩层则以顺磁性的亚铁为主，暗色和绿色岩石仅含有顺磁性的二价铁或者与相对丰度较低的三价铁共存。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。