LGR 二氧化碳同位素分析儀最新應用:應用LGR二氧化碳同位素分析儀,通過(guò)測定腸易激綜合癥患者的呼出氣體中的13CO2和12CO2的同位素分子比率,可以對患者體內小腸細菌過(guò)度生長(cháng)情況做出正確診斷Diagnosis of small intestinal bacterial overgrowth in irritable bowel syndrome patients using high-precision stable 13CO2/12CO2 isotope ratios in exhaled breath Gourab D. Banik,a Abhijit Maity,a Suman Som,a Chiranjit Ghosh,a Sunil B. Daschakraborty,b Sujit Chaudhuri,b Shibendu Ghoshc and Manik Pradhan*ad Hydrogen breath tests (HBT) are widely used for the d...
發(fā)布時(shí)間:
2015
-
01
-
22
瀏覽次數:50
Short-term e?ects of thinning, clear-cutting and stump harvesting on methane exchange in a boreal forest關(guān)于人類(lèi)對北方森林的疏伐、濫砍濫伐和樹(shù)樁采伐對甲烷交換的短期影響 E. Sundqvist1, P. Vestin1, P. Crill2, T. Persson3, and A. Lindroth1 1Department of Physical Geography and Ecosystem Science, Lund University, Sweden 2Department of Geological Sciences, Stockholm University, Sweden 3Department of Ecology, Swedish University of Agricultural Sciences, Sweden原文鏈接:http://www.biogeosciences-discuss.net/11/4637/2014/bgd-11-4637-2014.pdf
發(fā)布時(shí)間:
2015
-
01
-
05
瀏覽次數:53
Short-term e?ects of thinning, clear-cutting and stump harvesting on methane exchange in a boreal forest關(guān)于人類(lèi)對北方森林的疏伐、濫砍濫伐和樹(shù)樁采伐對甲烷交換的短期影響 E. Sundqvist1, P. Vestin1, P. Crill2, T. Persson3, and A. Lindroth1 1Department of Physical Geography and Ecosystem Science, Lund University, Sweden 2Department of Geological Sciences, Stockholm University, Sweden 3Department of Ecology, Swedish University of Agricultural Sciences, Sweden 原文鏈接:http://www.biogeosciences-discuss.net/11/4637/2014/bgd-11-4637-2014.pdfShort-term e?ects of thinning, clear-cutting and stump harve12f9fc...
發(fā)布時(shí)間:
2015
-
01
-
05
瀏覽次數:42
In Situ Measurement of Dissolved Methane and Carbon Dioxide in Freshwater Ecosystems by Off-Axis Integrated Cavity Output Spectroscopy應用LGR離軸積分腔輸出光譜技術(shù)原位測量淡水生態(tài)系統中的溶解甲烷和二氧化碳 Gonzalez-Valencia R1, Magana-Rodriguez F, Gerardo-Nieto O, Sepulveda-Jauregui A, Martinez-Cruz K, Anthony KW, Baer D, Thalasso F. AbstractA novel low-cost method for the combined, real-time, and in situ determination of dissolved methane and carbon dioxide concentrations in freshwater ecosystems was designed and developed. This method is based on the continuous sampling of water from a freshwater ecosystem to a gas...
發(fā)布時(shí)間:
2014
-
12
-
25
瀏覽次數:158
瑞士科學(xué)家應用LGR快速甲烷分析儀在空中測量甲烷氣體排放 奶牛是最能代表瑞士的動(dòng)物,為這個(gè)國家生產(chǎn)奶酪,巧克力和牛奶,同時(shí),也不斷排放一種溫室氣體:甲烷。甲烷對氣候變化的影響,是二氧化碳的20倍?,F在,ABB旗下的LGR機載型快速甲烷分析儀為科學(xué)家們提供了可靠的工具來(lái)測量這一乳業(yè)副產(chǎn)品—甲烷。更多信息,請瀏覽:http://www.abb.com/cawp/seitp202/35E15CA4261E301BC1257D16003F6A08.aspx https://plus.google.com/102984631679721608539/posts/9dWxQEj3qEq
發(fā)布時(shí)間:
2014
-
07
-
23
瀏覽次數:67
NOAA使用LGR的CO分析儀來(lái)提高主要氣體的參考標準,之所以選用LGR CO分析儀,是因為它有著(zhù)更高的準確性、精確度和線(xiàn)性相關(guān)度。詳情請訪(fǎng)問(wèn)網(wǎng)址:http://www.wmo.int/pages/prog/arep/gaw/documents/CO_scale_X2014-notice.pdf或者查看如下附件: CO_scale_X2014-notice.pdfacc77c567b1f7446c11b5d76b0e55842.pdf (143.68 KB)
發(fā)布時(shí)間:
2014
-
05
-
29
瀏覽次數:69
Where does streamwater come from in low relief forested watersheds? A dual isotope approach探訪(fǎng)低起伏森林流域中溪水的來(lái)源 J. Klaus1,2, J. J. McDonnell2,3, C. R. Jackson4, E. Du5, and N. A. Griffiths6 1Centre de Recherche Public – Gabriel Lippmann, Department of Environment andAgro-biotechnologies, Belvaux, Luxembourg2Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada3University of Aberdeen, School of Geosciences, Aberdeen, UK4Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, USA5Climate Science Department, Lawrence Ber...
發(fā)布時(shí)間:
2014
-
03
-
17
瀏覽次數:38
Approaches for Achieving Long-Term Accuracy and Precision of #18Oand #2H for Waters Analyzed using Laser Absorption Spectrometers應用LGR液態(tài)水同位素分析儀長(cháng)期測定#18O和#2H的準確度和精度Leonard Irwin Wassenaar, Tyler Coplen, and Pradeep K. AggarwalEnviron. Sci. Technol., Just Accepted Manuscript ? Publication Date (Web): 16 Dec 2013Downloaded from http://pubs.acs.org on December 23, 2013 Approaches_for_Achieving_Long-Te rm_Accuracy_and_Precision_o209a5d42766de93abb6ff307d9ad4db5.pdf (800.18 KB)
發(fā)布時(shí)間:
2013
-
12
-
27
瀏覽次數:49
青海湖流域具鱗水柏枝植物水分利用氫同位素示蹤研究趙國琴1,2 李小雁1,2* 吳華武2 張思毅2 李廣泳21地表過(guò)程與資源生態(tài)國家重點(diǎn)實(shí)驗室, 北京 100875; 2北京師范大學(xué)資源學(xué)院, 北京 100875 摘要 具鱗水柏枝(Myricaria squamosa)是我國高寒地區廣泛分布的優(yōu)勢河谷灌木, 具有維持河谷濕地系統穩定的功能。然而, 目前國內外有關(guān)具鱗水柏枝水分利用來(lái)源的定量研究很少。該文運用氫穩定同位素示蹤方法, 分析了青海湖流域具鱗水柏枝莖(木質(zhì)部)水和潛在水源(地下水、河水和土壤水)的氫穩定同位素比率(δD)的季節變化, 發(fā)現具鱗水柏枝在不同水文環(huán)境下的植物水分利用來(lái)源有明顯差異。研究結果表明, 生長(cháng)在河岸邊的具鱗水柏枝在6、7月主要利用地下水與河水, 分別占其所利用水分的89%、86%和55%、65%, 8月主要利用0–20 cm土層的土壤水, 9月水源不詳。生長(cháng)在離河岸約100 m處的具鱗水柏枝在6月主要利用地下水與河水(91%、70%), 在7–9月以0–60 cm土層的土壤水為主要水源。這表明生長(cháng)在河岸邊的具鱗水柏枝對地下水和河水的依賴(lài)程度較高, 而距離河岸約100 m時(shí)對土壤水的利用量較多, 反映出生長(cháng)在不同生境中的具鱗水柏枝對特定水分條件的特殊適應結果。關(guān)鍵詞 氘同位素, 具鱗水柏枝, 植物水分...
發(fā)布時(shí)間:
2013
-
12
-
16
瀏覽次數:47
植物葉片、莖稈和土壤水δ18O和δD是研究土壤-植被-大氣系統生態(tài)水文循環(huán)過(guò)程的重要示蹤劑。與傳統的穩定同位素質(zhì)譜(IRMS)技術(shù)相比, 穩定同位素紅外光譜(IRIS)技術(shù)具有測量速度快、運行成本低等優(yōu)勢,將促進(jìn)穩定同位素生態(tài)學(xué)的發(fā)展。利用低溫真空蒸餾抽提技術(shù)獲得的植物葉片和莖稈水中含有甲醇和乙醇類(lèi)有機污染物,造成δ18O和δD的IRIS測量值偏離IRMS測量值(2.64±0.43)‰和(3.6±0.8)‰,超過(guò)了儀器精度。中國科學(xué)院地理科學(xué)與資源研究所的科研人員利用純水混入不同濃度的色譜純甲醇或乙醇,結合LGR公司生產(chǎn)的908-0008液態(tài)水同位素分析儀及光譜分析軟件確定甲醇(NB)和乙醇(BB)類(lèi)物質(zhì)污染程度的光譜度量值, 建立了葉片莖稈水δ18O和δD的光譜污染校正方法。該研究成果將于近日發(fā)表在《中國生態(tài)農業(yè)學(xué)報》第20卷第10期。 2012 紅外光譜測定葉片莖稈水18O和2H有機污染校正方法.pdf0db6094cf0b94390a2b7199c20ca8cdf.pdf (717.60 KB)
發(fā)布時(shí)間:
2012
-
09
-
11
瀏覽次數:53