| 1. | Minimum zinc solubility is in the ph range 6. 0 to 8. 0 .
土壤PH值为60-80时，锌的溶解度最小。 |
| 2. | Durability in water at given ph : no effect on material in ph range of 3 - 11
耐酸碱性：在ph为3 ? 11范围的水中，本品不受影响。 |
| 3. | 2 extensive ph range of application : it will go into effect during ph5 - 12
广泛的ph值适应范围： ph5 - 12范围内可发挥增稠功能。 |
| 4. | Mightysil gp is a versatile , highly reliable hplc column designed for use with a variety of samples having a wide ph range from acidic to basic
Mightysil gp为一用途广泛，且具高信赖度之管柱，可用于分析多种具备广泛酸硷值之样品。 |
| 5. | By the mixing of sodium sulfide and sodium molybdate within a suitable ph range , molybdenum trisulfide particles were obtained as precipitation substance
在一定酸性的条件下将硫化钠和钼酸钠的水溶液进行混合与反应，生成棕色三硫化钼膏状沉淀。 |
| 6. | Each species has the ability to grow within a specific ph range , which may be broad or limited , with the most rapid growth occurring within a narrow optimum range
每一种生物都具有在特定酸碱度范围内生长的能力，这个范围可能宽或窄，在一个窄小的最适范围内会有最快速的生长。 |
| 7. | 2 . preparation and application of variablevalency drugs pqc sensors based on ion - pair complexes . pqc sensors obtained much higher sensitivity and wider ph range than the electrodes based on nemst equaion
来自各种药物制剂和体液中各种药物的分析结果表明，这种传感器制作简便，操作方便，灵敏度高，选择性好，线性范围一般较宽。 |
| 8. | 5 and was virtually inactive above ph 6 . 0 . when the enzyme was incubated at various ph values at 37 ? c for 30 min in the absence of substrate and the residual activity was measured , the phytase was found to be stable at the ph range of 2 to 8
该酶反应的最适ph值为5 . 5 ，在phz一6之间都有较高的酶活性， ph大于6时植酸酶的活性迅速下降，在phz一8之间的稳定性很好，活性> 70 % 。 |
| 9. | Its cell wet weight increases in 72h and then keeps constant . studies on the partial enzyme characters of recombinant phytase showed that the recombinant phytase had two ph optima ( 2 . 5 - 3 . 0 and 5 . 0 - 5 . 5 ) and a temperature optimum 55 , and with higher activity under the ph ranged from 4 . 5 to 6 . 0
重组植酸酶部分酶学性质的研究结果表明:重组酶在ph值2 . 5一3 . 0和5 . 0一5 . 5时酶活性最高，且在ph4 . 5一6 . 5之间均有较高的酶活性，最适作用温度为55 。 |
| 10. | 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 |
