nitrogen concentration 中文意思是什麼

nitrogen concentration 解釋
吹乾儀
  • nitrogen : n 【化學】氮，氮氣。 nitrogen chloride 三氯化氮。 nitrogen cycle 氮循環。 nitrogen dioxide 二氧化...
  • concentration : n. 1. 集中。2. 【化學】提濃，蒸濃，濃縮；濃度；稠密度；【礦物】汰選，選礦，富化。3. 集中注意，專心。
  1. The primary results showed : using m199 as diluents containing 20 % bovine serum, it is better to freeze the cells slowly freezing at fist then increase freezing speed ( for example, from 0 to - 6 freezing speed is about - 0. 05 a minute, from - 6 to - 40, freezing speed is about - 0. 5 a minute ), studies on effect of various concentration of dmso demonstrate that about 12. 5 % dmso gave the highest post - thaw percentage of viable cells. the concentration of bovine serum had no different effect on the percentage of the viable embryo cells of misgurnus auguillicaudatus. the embryo cells derived 6 from the later stage of blastula offish is more resistant to the cryogen than the cells of early stage of blastula. the cells preserved in liquid nitrogen at - 196 were thawed and cultivated, a few cells were found adhere to the surface of culture vessel when the percentage of viable cell was more than 30 %. the cells in only two culture vessels were found to proliferated and gave rise to many small morphologically undifferentiated cells

    研究初步表明:以細胞培養液m199 （含2既的小牛血清，常規量雙抗）為凍存稀釋液對泥鰍胚胎細胞冷凍保存宜採取先慢后快的方式（例如，從0一一6 ，凍存速度為一0 . 05 / min ，再以一0 . 5 / min的速度從一6一一40 ） ; dmso的保護效應濃度為12 . 506左右;小牛血清的濃度對泥鰍胚胎細胞的成活率影響不明顯;囊胚晚期細胞抗凍性比中早期強;通過對不同批次的凍存細胞解凍培養，解凍后成活率為30 %以上細胞培養數天後均有少數細胞貼壁，但只發現兩瓶培養細胞有明顯增殖現象產生許多未分化的小細胞。
  2. This method is to obtain multi - fungi from water and waster water by methylene chloride fluid - fluid extract nitrogen, and then take the concentration purification to the highly effective liquid phase color spectrometer where it can be detected by the diode matrix detector

    摘要用二氯甲烷液液萃取氮吹濃縮法萃取水和廢水中的多菌靈，取濃縮純化后的有機相直接進樣到高效液相色譜儀，用二極體矩陣檢測器檢測，根據保留時間外標法定量。
  3. In chapter 1, the history investigation of gap : n with dilute nitrogen concentration, especially its isoelectronic exciton mechanics and the study background of gapn alloys are briefly introduced

    早在二十世紀六十年代， thomas等人就發現在gap : n中，存在一系列尖銳譜線。
  4. Area was the best inorganic nitrogen source which should maintain at high concentration at earlier part of fermentation because of saccharomycete ' s feature

    尿素是最佳的無機氮源，由於酵母細胞對氮源吸收利用特點，在發酵初期氮源需要保持較高水平。
  5. The design and structure of nitrogen tetroxide concentration monitor are introduced

    摘要介紹了四氧化二氮毒氣濃度監測儀的設計思路和組成結構。
  6. Some key points are resolved with advanced software design conception and technology, and a nitrogen tetroxide concentration monitor with sound and light alarm is developed

    通過採用先進的軟體設計思想與技術，解決了幾個關鍵問題，成功地研製出了具有聲光報警功能的高性能四氧化二氮毒氣濃度監測儀。
  7. Liupanshui beer co. ltd. has retrieved from bankruptcy to rapid development depending on technical innovation and improvement as follows : strengthening the control of saccharifying boiling intensity, the age of fermenting beer, filtration time, bottle washing of remnant alkali, sterilization intensity, and pressure prepare in nitrogen filling etc. ; making full play of employee ' s initiative and installing new equipments ; making control of filtration beginning time and keeping stable beer storage time at 0 ; settling the problem of beer species by high concentration dilution method ; applying low - pressure boiling system to increase boiling intensity, shorten boiling time, and increase beer non - biologic stability ; and making innovation of fermentation techniques to increase beer quality etc

    摘要六盤水啤酒有限責任公司依靠科技創新、走科技進步之路，通過加強對生產過程的糖化煮沸強度、發酵酒齡、開濾時間、洗瓶殘堿、殺菌強度、灌裝氮氣背壓等方面的控制；發揮人的主觀能動性，實施增加硬體設施；控制開濾時間，穩定控制0貯酒時間；利用高濃稀釋解決品種矛盾；採用低壓煮沸系統，提高煮沸強度、縮短煮沸時間，提高啤酒的非生物穩定性；改進發酵工藝，提高產品質量等措施，使企業實現了發展。
  8. 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
  9. 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 。
  10. During this time both the monthly average algae density and lasting time increased year after year. the main algae forming algae bloom was cyanophyta and the dominant generas were microcystis. the accumulation of nutrients ( such as total nitrogen and total phosphorus ) with high concentration, high temperature of water and strong sunshine caused the algae bloom

    結果表明，水溫較高的夏秋季（一般為7 9月）是天津市城市供水水源的藻類高發期；近幾年，高藻期含藻量呈逐年增加趨勢，持續時間呈逐年延長趨勢；高藻期水源水以藍藻為主，所佔藻類總數最高和最低比例分別為91和70 ，其中的優勢屬為微囊藻屬；水源水中高含量的氮、磷等營養鹽是藻類高發的內在因素，水溫、光照等是外在誘發因素。
  11. Photo of ammonia nitrogen concentration nh3 - n in the tuen mun river

    屯門河tn1的氨氮含量圖片
  12. Study on nitrogen concentration and deposition amount in wet deposition in typical wetland ecosystem of sanjiang plain

    三江平原典型濕地系統濕沉降中氮濃度及沉降量初步研究
  13. The violent disorder of flooding and ebbing resulted in the release of nitrogen in tidal flat sediment and overlying water so that total nitrogen concentration raised rapid on water surface

    漲潮初和落潮末潮流對灘面的強烈擾動會導致灘面沉積物及間隙水中氮的釋放，造成上覆水體中tn濃度的迅速升高。
  14. However, except nitrate, the nitrogen concentration including nitrite, ammonia, don, pn and tn in spring 1998 were higher than those in autumn 1997, with the average concentration of 4. 9714. 65, 0. 67 ?. 20, 0. 7210. 30, 9. 2516. 88, 7. 3014. 42 and 22. 9 ? 0. 2 mol / dm3 in autumn, and 4. 5812. 39, 0. 70 + 0. 14, 2. 2611. 05, 9. 8814. 92, 7. 8816. 21 and 25. 318. 94 mol / dm3 in spring, respectively. the n / p ratio in autumn 1997 was 13. 217. 54 in average which a little lower than redfield ratio, nevertheless in spring 1998 the value was as high as 25. 6113. 0, much hi gher than redfield ratio. there shows a clear seasonal variation of phosphorus structure in two seasons, but the nitrogen structure almost unchanged

    兩個季節海水中磷的結構變化明顯，秋季磷主要以pp （ 54 ）為主，而春季長江口營養鹽、石油烴對海洋生態系統影響及動力學研究主要以po4一p （ 51 % ）為主;兩季節氮的結構基本一致，溶解氮都以don為主，分別為40 %和39 % :秋季no3一n比例較春季略高（ 22 % ） ，而春季nh4一n比例較秋季略高（ 9 % ） 。
  15. Percent nitrate nitrogen, ammonium nitrogen and total phosphor was not a significantly variable at the different depths. 2 ) vegetation type results in significant difference in nitrate removal. lolium perenne l is most effective on reducing nitrate nitrogen concentration, accounting to 90 %. for total phosphor, natural vegetation is most effective, reaching 61. 01 %

    2 ）不同植被緩沖帶對銨氮、總磷、硝氮、總氮的去除效果不同，牧傑對氮鹽的去除效果最強，特別是對硝氮的吸收達到90 ，對總磷吸收能力在總體上弱於氮元素的吸收能力，在自然植被處達到最高，為61 . 01 。
  16. The seasonal change of total nitrogen concentration was controlled by the nitrogen transportation of yangtze runoff and it was a little more in summer and autumn but a little less in spring

    Tn濃度季節性變化受長江徑流n素輸送量的控制，夏、秋兩個季節的tn濃度較大，而春季較小。
  17. Chemolithoautotrophic nitrifying bacteria have many unfavorable physiological characteristics, namely, slow growth, small biomass and susceptible to environmental factors. to remove high ammonia - nitrogen concentration in wastewater from refineries, we directly enriched nitrifying bacteria of activated sludge via optimizing enrichment conditions ( temperature > phu nh4 + - n concentration ). the results showed that the number of nitrifying bacteria after 6 weeks enrichment increased 32. 8 times and nitrification rate improved 2. 76 times than that before enrichment

    實驗結果表明，在ph7 . 7 8 . 5 、 28 ， 150rpm振蕩暗培養的條件下，通過不斷添加富集培養基，經過6周的培養后，可以使硝化細菌的數量增加32 . 8倍，硝化速率提高2 . 76倍，達到了富集的目的。
  18. Fortunately, with the improvement in the material growth, gap1 - xnx alloys with nitrogen concentration as high as several percentage have been successfully grown by molecular beam epitaxy ( mbe ) or metalorganic vapor - phase epitaxy ( movpe ). more and more attentions have been paid to this alloy for its distinct property such as the giant band gap and effect, for this reason, gap1 - xnx alloys are usually called abnormal alloys

    人們研究發現， gapn混晶具有一些獨特的光電性質，例如其帶隙不是gap和gan的線性內插值，而是存在著較大的帶隙降低和巨大的帶隙彎曲系數，因此gapn混晶又被稱為「反常」混晶，從而引起了人們越來越多的關注，並成為當前的一個研究熱點。
  19. On the contrary, nitrogen concentration decreased with increasing light levels. defoliation led to lower leaf nitrogen content but higher nitrogen concentration contrasted with controlled plants. researches showed that leaf nitrogen content and leaf nitrogen concentration change with different light and defoliation treatment

    研究發現，單位葉重和單位葉面積n含量呈現不同變化的原因是由於不同處理植株比葉重之間有顯著差異的緣故，光照水平的降低和葉損失都會使植株的比葉重減小。
  20. Photo of total kjeldahl nitrogen concentration in the siu lek yuen nullah tr23l

    小瀝源明渠tr23l的凱氏氮含量圖片
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