ph optimum 中文意思是什麼

ph optimum 解釋
ph最適值
  • ph : PH ＝public health 公共衛生。【化學】表示氫離子濃度的倒數的對數的符號。
  • optimum : n. （pl. optimums, -ma ） 【主、生】（成長繁殖等的）最適條件，最適度。adj. 最適宜的。 the optimum temperature 最適溫度。
  1. 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

    論文詳細研究了反應單體的摩爾比、反應溫度、時間、濃度、反應溶液的酸堿度及甲醛的滴加速度等對產品ash - jd性能的影響，通過試驗，得到了這些因素的最佳水平。
  2. It is shown that the effect of pac removing fluoride is closely related to ph value and the optimum range of ph value is between 6. 1 ? 7. 1. under this condition, further studies are made on the optimum coagulant dosage, mixing time, artificial turbidity, filtration rate and filter bed ' s depth and the optimum range of these parameters have been determined

    堿式氯化鋁的除氟能力與原水的ph值有密切的關系，除氟最佳ph值范圍為6 . 1 ? 7 . 1 。在此條件下，進一步對最佳投藥量、混合時間、反應時間、人工輔助投加濁度、濾速及濾層厚度進行了研究，確定了其最優的取值。
  3. The result shows that, the optimum coagulation ph of nom is about 5. 0 and the mechanism for nom removal varies with ph

    實驗結果表明，有機物的最佳混凝ph值在5 . 0左右。
  4. 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菌株對環境因子的適應性研究：無氮培養條件下，測定溫度、碳源、酸堿度、滲透壓對w12生長及固氮能力的影響，結果表明，在15 - 40下均能生長並表達固氮酶活性，其最適生長及固氮的溫度為25 - 35 ；能利用葡萄糖、蔗糖、蘋果酸、甘露醇等多種碳源生長並固氮，當培養基中同時存在蔗糖和蘋果酸時，細菌生長和固氮活性最強；在偏酸和偏堿的條件下（ ph4 . 5 - 8 . 5 ）均能保持較強的生長勢和較高的固氮酶活性，並能通過調節自身代謝平衡並適應環境的酸、堿性變化，使培養液趨于中性：能耐受較高的滲透壓，培養液中卜、 5 naci濃度對其生長和固氮酶活性影響不大，當naci濃度升至2時，菌株的生長勢及固氮酶活性才有所下降：低濃度的鉸對其固氮酶活性影響不大，在0
  5. The xylanase activity of the mutant kept stable after 10 generations. after orthogonal designing experiment, the optimum fermentation conditions of a. niger j 506 were obtained, which is as followed : concentration of the major carbon resource 4 %, ratio between bran and corncob 5 : 5, concentration of glucose 0. 1 %, concentration of ammonium oxalate as supplemental nitrogen resource 2. 0 %, the initial ph of liquid medium 5. 0, 100ml / 250ml flask

    經過正交試驗設計，得出突變株a . nigerj506產木聚糖酶最佳的工藝條件為：主碳源濃度4 、麩皮與玉米芯的比例為5 ： 5 、輔加碳源葡萄糖的濃度是0 . 1 、輔加氮源草酸銨的濃度是2 . 0 ，培養基初始ph為5 . 0 ， 250ml三角瓶的裝液量為100ml 。
  6. The purified enzyme was a monomeric protein whose optimum ph was 8. 0. inhibitor study demonstrated that it was a metalloprotease and contained sulfhydryl groups essential for catalytic activity. its activity was inhibited by divalent cations such as zn2 +, mn2 +, and the kj values of zn2 +, mn2 + were imm

    這種酶溫度適應范圍較廣，在較大溫度變化區間內都具有明顯的活性，但是對緩沖溶液ph值的變化卻很敏感，體外以明膠為底物時最適溫度為38oc ，最適ph值為8
  7. It is studied that the activity against eumycetes of the fermentation filtrate ( 16h ) of strain jw - 725 is the strongest. the optimum nutritional sources are wheat bran and soya bean meal. the fermentation filtrate reserved under 4 still has bioactivity after 20 days or so, but its bioactivity decreases much while being treated under high temperature. the ph of fermentation filtrate has much influence upon the bioactive substance, and it remains activity at the range of 5

    發酵液在4下保存20天左右仍有抗菌活性；但經高溫處理后，其抗菌活性降低很多； ph對抑菌物質的生物活性影響比較大，抑菌物質保持活性的ph范圍是5 . 0 7 . 0 。分離到的多粘芽孢桿菌（ b polymyxajw - 725 ）對柑橘青黴菌（ p
  8. The transformed hairy roots were detected for agropine to make sure the transformation was successful. a conclusion was reached as follows : agrobacterium rhizogenes r1601 was an ideal strain for hairy roots transformation from trichosanthes bracteata voigt which exhibited extraordinary transformation rate ( 60 % ). od600 = 0. 7 was the optimum infection concentration for the tested transforming agent, with temperature at 25, ph at 6. 0, 20min of infection and 48h of co - culture and phytohormone at 1. 0mg / l being the most favourable hairy root - inducting pattern

    通過實驗和對結果的數據分析，得出下面的結論：發根農桿菌r1601是較好的大苞栝樓發根的誘導菌株，它對預培養24h的大苞栝樓子葉外植體具有最好的轉化效率和發根誘導率（ 60 ） ，最適的菌株感染濃度od _ （ 600 ）為0 . 7 ，溫度27 、 ph值為6 . 0 、 20min的感染時間和48h的共培養，以及黑暗條件和1 . 0mg / l的激素最有利於發根誘導的環境條件。
  9. The enzyme had its optimum activity at ph 3. 5 and 55 and its km for sodium carboxymethyl cellulose at 50 and ph 5. 0 was 7. 41mg / ml. sacilin was inhibited the enzyme

    -葡萄糖苷酶與內切-作用，可加速水解羧甲基纖維素鈉；內切p ?葡聚糖苷酶對葡萄糖苷酶水解水楊素具有抑制作用。
  10. The optimum technic conditions have been gotten in in preparaing high dispersive a1 ( oh ) 3 colloid by controlling reactant concentration, ph value, reaction temperature, matured time. they are the prereguisite to prepare nanopoder of a - a1203. this paper entirely and systematically studies the following three kinds of drying stages : oven drying, dehydration with alcohols and azeotropic distillation stage

    本文採用逐步逼近法進行了氫氧化鋁膠體的沉降實驗，對膠體形成的體系反應物的初始濃度、體系的ph值、反應溫度和膠體的陳化時間進行了系統優化，並獲得了制備高分散氫氧化鋁膠體的最佳工藝參數；此膠體經過過濾、 80下烘乾后所得樣品，在掃描電鏡下直接觀察其粒徑為50nm ，且分佈范圍窄，顆粒的表面清潔，為球形。
  11. As both the recombinant plasmids and the host dh5a had no laciq gene which encode lac represser, the trc promoter was not repressed by lac represser and always active. therefore the afpga could be constitutively expressed without iptg induction in the host dh5. in the shaking flask, the optimum ph and temperature for afpga expression was 7. 0 and 30

    兩重組質粒再轉化宿主菌dh5 ，由於重組質粒和宿主菌dh5均不含laci ~ q調控基因，重組菌不產生阻遏蛋白，控製表達的trc啟動子始終處于「開」狀態，因而所得重組菌dh5 pkkfpga和dh5 psmlfpga不需誘導便能組成型表達pga 。
  12. In order to obtain the mn - zn ferrite precursor particle which has itra - fme property, the optimum technological condition was obtained through the orthogonal experiments in this paper. in the co - precipitation procession of preparation the leading factors that affect the size of the particle are ratio of the ion concentration ( a ), ph of the reaction ( b ), temperature of reaction ( c ), and aging time ( d )

    本文通過拉丁正交試驗，以粒徑尺寸為考察目標，將離子濃度比（ a ） ，反應ph值（ b ） ，水浴溫度（ c ）和陳化時間（ d ）作為四參量，利用每一參量為變量進行試驗確定各參量值，從而確定製備超細錳鋅鐵氧體前驅體粉末的條件。
  13. It is a metalloprotease, having a basic proteolytic activity with the optimum ph of 9. 5 and being inhibited by edta. its anti - coagulation activity was characterized

    此組分具有堿性蛋白酶活性，最佳反應ph約為9 . 5 ，不耐高溫， edta能抑制其蛋白酶活性，是一種金屬蛋白酶。
  14. Laccase being catalyzer, the degradation mechanism of 2, 4 - dichlorophenol, 4 - chlorophenol and 2 - chlorophenol is studied. the effects of reaction time, ph, temperature, concentration of chlorophenols and laccase on the removal of chlorophenols are discussed in detail, as well as the optimum reaction condition

    採用漆酶為催化劑，研究2 ， 4二氯酚4氯酚和2氯酚的催化降解機理，探討了反應時間ph值反應溫度氯酚濃度以及漆酶濃度對其降解效果的影響和最適降解條件。
  15. In this paper, the optimum conditions of catalyst preparation were found by studying the influences of the sol - gel process parameters on the crystal structure of the nanometer la1 - xsrxmno3, such as the value of original solution ph, the temperature of water bath, the baking temperature of sol

    本文研究了採用溶膠-凝膠法制備納米鈣鈦石型氧化物催化劑過程中，初始溶液ph值、水浴溫度、焙燒溫度對納米la1 - xsrxmno3晶體結構影響。
  16. 30 % ~ 60 % ammonium sulfate fractionation of the crude extract was carried out at 4 ?. the optimum temperature and ph for it were 37 ? and 6. 5

    結果發現，該酶作用的最適ph為6 . 5 ，最適溫度為37 ；在ph5 8之間穩定，其熱穩定性不高。
  17. There are at least three kinds of ep in petal : thiol - proteinase, metallo - proteinase, serine proteinase. they gather at the site between 43 kd and 66. 2 kd ( about 52 kd ) on the substrate gel electrophoresis. the optimum ph of thiol - proteinase, metallo - proteinase is ph 6, which are looked as acid ep, the serine proteinase has two forms, one is acid ep ( ph 6 ), and the other is alkali ( ph 10 )

    花瓣中都至少有3種內肽酶：巰基蛋白酶、金屬蛋白酶、絲氨酸蛋白酶，三者聚集在底物膠電泳膠條的43kd 66 . 2kd之間的位置，約為52kd ；前兩種最適ph為6 ，是酸性內肽酶，后一種有酸（ ph6 ） 、堿（ ph10 ）兩種存在形式，既是酸性內肽酶又是堿性內肽酶。
  18. An optimum ph for pm h + - atpase hydrolysis activity was around 7. 0, and the optimum temperature was 37 in vitro. thaw / freezing decreased the enzyme hydrolysis activity in our experiment

    綠豆下胚軸質膜h ~ + - atpase水解活力受溫度的影響， 37時，體外反應的水解活力最高。
  19. And then the sde ligands were immobilized on the spacer arms - containing paam beads by glutaraldehyde or edc to prepare the bionic adsorbents. the factors that can influence the immobilized ligand density were also studied. the optimum conditions of coupling sde ligands through its - nh to paam beads by glutaraldehyde are : the initial concentration of 5mg / ml ( 8g wet paam beads ) of sde gives more efficient results than the higher ones ; the concentration of glutaraldehyde which activated paam beads is 5 % ; ph of activation is 7. 0 ; the coupling reaction time is at least 4 hours

    同時對影響sde配體固定化量的各種因素也做了初步的探討，結果如下：戊二醛固定化sde配體的最適條件為： sde配體的初始濃度為sing ml （載體用量為sg ，濕重）時，效率最高；活化載體時的ph值為7刀；戊二醛的活化濃度為5 ：偶聯時的ph值為7刀；偶聯時間不少於4小時。
  20. Escherichia coli phytase appa is an alternative enzyme with performance advantages over the conventional a. niger enzyme. the appa phytase displays several favorable characteristics : an acidic ph optimum close to the physiological ph range of the stomach of pigs and chickens, higher affinity to sodium phytate, greater resistance to pepsin than the commercially available a. niger phya, and higher catalytic efficiency for phytate than that of all other known phytases

    大腸桿菌來源的appa植酸酶是一種新型的植酸酶，與常規的黑麴黴植酸酶相比具有許多優點，如與豬、雞等畜禽胃的ph環境更加適應，與底物植酸更強的親合性以及對消化道蛋白酶更強的抵抗性。
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