Effects of diverse environmental factors on the growth rate ( od4oo ) and nitrogenase activity ( ara ) of the strain w12 hi nitrogen - free culture were investigated in our experiments . the results implied that the strain w12 could easily adapt to different cultural conditions : it could use various carbon sources ( especially glucose , sucrose , malic acid , mannitol ) , propagate quickly and fix nitrogen at a temperature range of 15 ? to 40 ? and at 25 - 35 ? for optimum , at a ph range of 4 to 8 . 5 , at a saline concentration range of 0 . 01 % to 1 . 5 % ; low nlv " concentration had little effect on its nitrogenase activity . ara could also be detected when it grow in the culture media with 5mmol / l ntv " W12菌株对环境因子的适应性研究：无氮培养条件下，测定温度、碳源、酸碱度、渗透压对w12生长及固氮能力的影响，结果表明，在15 - 40下均能生长并表达固氮酶活性，其最适生长及固氮的温度为25 - 35 ；能利用葡萄糖、蔗糖、苹果酸、甘露醇等多种碳源生长并固氮，当培养基中同时存在蔗糖和苹果酸时，细菌生长和固氮活性最强；在偏酸和偏碱的条件下( ph4 . 5 - 8 . 5 )均能保持较强的生长势和较高的固氮酶活性，并能通过调节自身代谢平衡并适应环境的酸、碱性变化，使培养液趋于中性：能耐受较高的渗透压，培养液中卜、 5 naci浓度对其生长和固氮酶活性影响不大，当naci浓度升至2时，菌株的生长势及固氮酶活性才有所下降：低浓度的铰对其固氮酶活性影响不大，在0
Its unique compound formula can regulate the skin ph value , inhibit excessive sebum secretion , and decompose excessive greases through oxidizing reaction with greases on the skin surface ; the shrinking factor contained can smoothen and shrink pores inward , improve roughness arising from pore blocking , make skin look tight and fine 其独特的复合配方，能调节皮肤的酸碱度，抑制皮脂线分泌过多油脂，并能与皮肤表面的油脂发生氧化反应，使多馀油脂分解代谢，蕴含收敛因子更能畅通毛孔，令毛孔向内收缩，从而改善因毛孔阻塞而造成的粗糙问题，使肌肤看起来紧实细致。
In order to investigate the effects of ph , temperature , naf and bivalent cations on the conformation of the phosphatase in solution , we monitored the difference of intrinsic fluorescence of the phosphatase and compared changes of the enzyme activity under those conditions . the tertiary structure loosed and the intensity of fluorescence decreased below ph 6 . 0 . the intensity of fluorescence was lowest at ph 5 . 0 and the tertiary structure was reconstructed as the solution ph was increased 其中在ph5 . 0及以下时，蛋白质的三级结构变得松散，荧光强度下降， ph5 . 0时尤为显著，而当溶液ph高于5 . 0时(酶的最适ph ) ，样品的荧光发射强度明显增加，表明酶蛋白受溶液酸碱度的影响，构象发生部分变化，部分trp残基向疏水环境移动，其三级结构得到恢复。
A quantitative appraisal of the prospect of uranium mineralization is completed based on a set of hydrochemical data acquired from the known in - situ leachable sandstone - type uranium , including radon content , acid - alkali ratio , oxidized and reduced electronic potential , hydrocarbonate radical and uranium content in water 但是在找铀过程中仅用水化学成份、氡含量、酸碱度和氧化还原电位等数值进行描述，说明它们与铀矿化的关系，这种单一因素的描述不能综合反映与铀矿化的联系程度，以定量评价铀矿化与上述因素的关系，从而影响了水化学找矿的效果。
The factors influencing on the performance of ash - jd such as the moore ratio of monomers , the reaction temperature and time , concentration , the ph value of reaction solution and the drippy speed of formaldehyde were studied carefully . through experiments , the optimum level of those factors was gained 论文详细研究了反应单体的摩尔比、反应温度、时间、浓度、反应溶液的酸碱度及甲醛的滴加速度等对产品ash - jd性能的影响，通过试验，得到了这些因素的最佳水平。
It is considered that pretreatment could improve the physical and chemical of ofmsw characteristics , such as solubility , acidity , alkalinity , and biodegradability , and accordingly increase soluble chemical demand ( cod ) and volatile fatty acid ( vfa ) , enhancing biogas yield , reducing hydraulic retention time ( hrt ) , optimizing anaerobic process and releasing post - treatment 研究认为，通过溶胞处理能够改善有机垃圾的物理化学性质如发酵物料的溶解度、酸碱度等，提高微生物对难降解有机物的分解，增加可溶性cod和挥发性酸的浓度，优化发酵细菌的代谢途径以及产物的组成等，从而增加生物气产量，缩短水力停留时间，强化厌氧发酵过程，减轻了后续处理的负担。
Efficiency : richly contain vegetal essence , tea polyphenol , hamamelis essence and ha , instantly penetrate into deep skin , soften horniness , supply moisture and nutrition , balance skin ph value , shrink pores , constantly moisturize skin , activate reticulum cells , remove fine and dry lines , firm droopy skin and make refreshing , moist , firm and bright 功效：富含丰富的植物精华成份、茶多酚、金缕梅精华和透明质酸，迅速渗透肌肤内层，软化角质，补充肌肤水份和养份、平衡皮肤酸碱度、收缩毛孔，同时提供长效保湿，活化皮肤网状组织细胞，减少细纹、干纹的产生，紧实松驰肌肤，用后令肌肤清爽滋润，回复弹性光泽。
In the article , it states another model of oxygen corrosion - corrosion caused by dissolving oxygen , it causes damage on the metal wall surface by oxygenation when the oxygen content in the water is much higer and it is affected by some extra factors ( such as temperature , degree of the acid and the basicity , the content of solid , the water power of scouring and so on ) 本文讲述的是另一种形式的氧腐蚀溶解氧的腐蚀，即由于水中氧含量较高在一定外加条件作用下（如温度、酸碱度、固含量、水力冲刷等）而引起金属壁面的氧化破坏。
From above experiments it is indicated that by regulating the ph in the microenvironment and exposing the habitat of the microorganisms in alkali environment the spore germinating ratio is inhibited and primary infection site decreased , in this way the occurrence and spread of the disease are managed effectively 从以上试验可以看出，调节微环境的酸碱度，使微生物栖息地微环境处于偏碱状态下，能抑制病原菌孢子的萌发，减少初侵染点，从而有效地控制了病害的发生和扩展。
