ppb 中文意思是什麼

ppb 解釋
p. p. b. ＝parts per billion 十億分之一。

  1. Standard practice for determination of adsorptive capacity of activated carbon by a micro - isotherm technique for adsorbates at ppb concentrations

    用ppb濃縮時吸附物的微縮等溫線技術測定活性炭吸附能力的標準實施規程
  2. The results showed that the mean proportion of polymorphic loci ( ppb ) of anabasis aphylla, which comprised 3 subpopulations ( 58 individuals sampled ), generated by 16 primers was 94. 56 %, the value of ppb of ceratocarpus arenarius, which had 4 subpopulations ( 80 individuals sampled ), using 16 primers was 98. 00 %. the paper had proved that the higher genetic diversity and the genetic differentiation existed in the populations of boih anabasis aphylla and ceratocarpus arenarius, while the latter had much more genetic diversity than the former. moreover, the study discussed the shannon information index and nei ' s gene diversity index of the two species natural populations, which indicated that there were more genetic variations within the subpopu

    另外，通過rapd資料的聚類分析及相關性分析研究，發現無葉假木賊和角果藜自然種群的遺傳結構與綠洲沙漠過渡帶的微生境生態因子（主要是土壤因子）相關，其中無葉假木賊亞種群遺傳多樣性水平不僅與土壤含水量（ w ） 、鉀鈉離子濃度（ k + na ）和氯離子濃度（ cl ）呈顯著的正相關（ p 0 . 05 ） ，還與土壤中有機質（ som ） 、全氮（ nt ）和全磷（ pt ）含量呈顯著的負相關；同時，角果藜種群的遺傳多樣性水平與土壤中有機質（ som ）和全氮（ nt ）含量呈顯著的正相關，而與co _ 3 ~ （ 2 - ）濃度呈顯著的負相關；除此之外，其它土壤生態因子與兩物種遺傳多樣性水平的相關性均不顯著（卜0 . 05 ） 。
  3. All drill water to be pretreated with 2 ppb gluteraldehyde

    所有的鉆井水都要按每桶加兩磅的戊二醛作預處理。
  4. 6 %, the result of issr is ppb = 70. 83 %, h = 0. 2383, i = 0. 3576. 5

    八角蓮和六角蓮在遺傳上已有有明顯的分化。
  5. Add 25 ppb bentonite and allow to hydrate for a minimum of 6 hrs

    按每桶鉆井液加25磅的膨潤土，允許水化至少6個小時。
  6. In original english language for the 1st impression. the net price to the publisher is at the ratio 1. 6 of the ppb cost

    原書第一次印刷的文字形式是英文。出版者支付的凈價依據ppb成本1 . 6的比率計算。
  7. Among the asthmatic chinese children, the level of nitric oxide is about 80 parts per billion ( ppb ) while for normal children it is only 29ppb

    結果發現患有哮喘的華人兒童中，一氧化氮的濃度為80ppb ，正常兒童則只有29ppb 。
  8. Ultrapur is the guaranteed ultra - pure class reagent that meets the need for superior trace analysis to ppb, ppt detection limits and beyond

    Kanto taiwan corp . utrapur為超高純度級之試劑，適用於超微量之分析，可達到或超越ppb ppt級之偵測極限。
  9. Standard test method for determining residual vinyl chloride monomer content in ppb range in vinyl chloride homo - and co - polymers by headspace gas chromatography

    用液上氣相色譜法測定氯乙烯均聚物和共聚物中的十億分之一級殘余氯乙烯單體含量的標準試驗方法
  10. The pharmacy and poisons board ( ppb ) is the statutory authority set up under the pharmacy and poisons ordinance to take charge of the registration of pharmaceutical products in hong kong

    藥劑業及毒藥管理局是根據《藥劑業及毒藥條例》 （ 《條例》 ）的規定而成立的法定機構，負責處理本港藥劑製品的注冊事宜。
  11. The results of issr analysis is ppb = 66. 67 %, h = 0. 2089, i = 0. 3172. genetic diversity of issr is higher than that of allozymes. genetic diversity of d. pleiantha is higher than d. versipelis

    六角蓮的遺傳多樣性高於於八角蓮，等位酶的多態位點比率p為55 . 6 ， issr的多態位點百分率均為70 . 83 ，基因多樣性為0 . 2383 ， shannon多樣性指數為0 . 3576 。
  12. The genetic diversity of p. sibirica, which is represented by 98 individuals collected from all 5 subpopulations, investigated with rapd markers. 77 loci were selected by fourteen 10 - mer primers, of which 76 were polymorphic. the percentage of polymorphic loci ( ppb ) of five subpopulations was 70. 13 %, 77. 99 %, 62. 34 %, 67. 53 %, and 61. 04 % respectively

    用rapd分子標記對叉毛蓬5個亞居群共98個個體進行了遺傳多樣性檢測， 14個10堿基寡聚核甘酸引物共檢測到77個位點，其中多態位點76個，多態位點比率為98 . 7 。
  13. They were registered in hong kong in november 2000 and june 2001 respectively. both avandia and actos had been subject to two - year carcinogenicity studies on rodents and subsequent clinical trials on humans before their registration applications were tendered to the ppb for consideration

    有關公司為這兩種藥物向藥劑業及毒藥管理局提出申請注冊前，已就這兩種藥物在老鼠身上進行為期兩年的致癌性研究，其後也在人體進行臨?測試。
  14. The percentage of specific polymorphic loci ( spb ) was 70 %, and the percentage of population polymorphic loci ( ppb ) varied from 14 % to 20 %. and hn population amount was the highest ( 20 % ), whereas the jx population was the lowest ( 14 % ), which indicated low genetic diversity within population and little variability among populations. 2

    八角蓮種水平多態性條帶比率ppb為70 . 02 ，種群水平多態性條帶比率ppb從14 . 78到20 . 19 ，平均為16 . 67 ，其中湖南天平山種群遺傳多樣性水平最高（ 20 ） ，江西種群最低（ 14 ） ，反映了種群內遺傳多樣性水平較低和種群間遺傳多樣性水平相差不大； 2
  15. The higher ppb ( 77. 99 % ) was in subp. 2 and lower ( 61. 04 % ) in subp. 5. the ppb ' s order was subp. 2 > subp. l > subp. 4 > subp. 3 > subp. 5. the result revealed higher genetic diversity level in p. sibirica

    利用shannon多樣性指數估計5個亞居群的遺傳多樣性，叉毛蓬亞居群內和亞居群間的遺傳多樣性所佔的比例分別為69 . 33和30 . 67 ，遺傳變異大部分存在於亞居群之內。
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