碳13的delta值 碳13的delta值是指样品中碳13同位素相对于标准物质PDB(Pee Dee Belemnite)的比例偏差。它的计算公式为: δ13C(‰)= ((13C/12C)样品 /(13C/12C)PDB - 1)× 1000 其中,‰表示千分之一,13C/12C是指碳13同位素和碳12同位素的比例。 δ13C值为负数表示样品中的碳13同位素相对于PDB较少,...
做了13c-尿素呼气试验结果是阳性delta=做了13c-尿素呼气试验结果是阳性delta=30.12正常值小于3。5是...
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Kankan diamonds (Guinea) III: δ 13C and nitrogen characteristics of deep diamonds. Investigates the carbon isotope composition, nitrogen impurities and aggregation level of diamonds from the Kankan area in Guinea. Origin of peridotitic an... Stachel,T.,Harris,... - 《Contributions to Mineralogy...
A level of delta 13C-UBT of>4 per thousand was diagnosed as H. pylori-positive. After the stomach was endoscopically sprayed with phenol red, biopsy specimens were taken from the antrum, body and cardia of the stomach for the assessment of H. pylori density, and activity (neutrophil ...
[translate] acompound drives 化合物驱动 [translate] aReconstruction of delta C-13 of chemocline CO2 (aq) in past oceans and lakes using the delta C-13 of fossil isorenieratene 三角洲chemocline二氧化碳aq C-13的重建 () 通过海洋和湖使用三角洲化石isorenieratene C-13 [translate] ...
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13c呼气实验结果分级为0级、I级、II级、III级,hp阳性25.5属于II级,相对中度严重。2. hp阳性代表幽门螺旋杆菌感染,可能出现消化道症状。3. 建议正规抗幽门螺旋杆菌治疗,使用公筷,防止传染他人及再次感染。 幽门杆菌可以自己消灭吗 3个小妙招 自己在家就能杀灭干净! 幽门杆菌可以自己消灭吗 幽门螺杆菌可以自己消灭,...
Reliability of isotopic fractionation (Delta N-15, Delta C-13) for the delimitation of trophic levels of oribatid mites: Diet strongly affects Delta C-13 b... Reliability of isotopic fractionation (Delta N-15, Delta C-13) for the delimitation of trophic levels of oribatid mites: Diet ...
In all cases the isotopic shift delta C-13 increases from the apex along the distance on a growth surface. In cases A and B, calcite deposited at the apex is in isotopic equilibrium with the solution of the drip water. The difference between delta C-13 at the apex and the end of the...