The carbon isotope composition of single alkanes (δ13Cia) in two plants (Leontopodium leontopodioidies and Taraxacum mongolicum ) growing in the northeastern Qinghai-Tibet plateau was analyzed by means of GC-IMS in order to know its relationship with altitude,and furthemore, to gain new data for the research on climatic changes.

用色譜—同位素質(zhì)譜儀對(duì)青藏高原東北部高寒草甸生態(tài)系統(tǒng)中的兩種高等植物—火絨草和蒲公英的烷烴進(jìn)行分析AV-级福利黑白配久久，討論環(huán)境因素對(duì)植物單體烷烴碳同位素組成（δ13Cia）的影響。

Result The results showed that its components were quite complex, and 89 organic compounds were identified. There were 72 kinds of oxygen-containing organic compounds which included esters, phenols, aethers, ketones and alcohols in the depolymerization product, small amounts of alkanes, alkenes, arenes, thiophenol and nitrogen-containing organic compounds were also detected, which showed that characteristics of the product with high oxygen content, low nitrogen and sulphur content.

結(jié)果］超臨界乙醇解聚產(chǎn)物成分十分復(fù)雜看片在线，GC/MS分析鑒定出89種有機(jī)化合物黄片mmm播放，其中72種為含氧化合物欧美日韩精品久久久久久，主要有酯、酚人人摸人人干、醚97人人操网站、酮和醇等，還檢測(cè)出少量烷烴99r视频国产在线观看免费、烯烴人人操V潮、芳烴、苯硫酚和含氮化合物69操碰人操女人色，反映了解聚產(chǎn)物的高含氧量和低含氮硫量的特性av毛片对白。

The preliminary tracing study on pollutant source using some molecular geochemical parameters was conducted. The results indicate that the smaller sizes of airborne particle result in the lower CPI value and a stronger tendency of unimodal distribution for n - alkanes.

運(yùn)用分子地球化學(xué)參數(shù)對(duì)污染源進(jìn)行的初步示蹤研究結(jié)果表明，顆粒物粒徑越細(xì)免费的三级网址，正構(gòu)烷烴越趨向于單峰形分布日韩在线一区二区三区免费视频，碳優(yōu)勢(shì)指數(shù)越低。

All the compounds were isolated and identified from the bituminous coals for the first time, bis(2-ethylheptyl) terephthalate and 18-ethyl-17-(hexan-2\'-yl) docosanoic acid are new compounds.Further more, a Colourless Oil Liquid, a white acerate crystals containing some alkanes, a white tabular crystals consisting of some fatty acid esters and a white powder crystals in which some fatty acids exist were isolated and analysed by GC/MS for the first time.Through this research, a study method of"classification extract of bituminous coal- separation with silica-gel and gelatin column chromatographies- identification of the isolated compounds by FTIR, GC/MS, LC/MS, 1H NMR and 13C NMR analyses"was established and proved to be a practical approach toward separable and non-destructive identification of some organic compounds in bituminous coals for coal chemistry research.

本研究建立了&原煤分級(jí)萃取-硅膠與凝膠柱層析分離與純化-GC/MS或LC/MS檢測(cè)-FTIR网站色色色色色、MS久久综合国产精、1H NMR和13C NMR波譜解析&這一煤中有機(jī)化學(xué)成分的非破壞性分離與分析的研究方法，并驗(yàn)證該研究方法有效可行黄片视频吗。

Then the molecular structure information connectivity indices of 22 alkoxyl silicon chlorides , 61 sulfides and 74 alkanes were calculated.

利用線性回歸技術(shù)分別建立了 22個(gè)烷氧氯硅烷a无码毛片免费视频、61個(gè)單硫醚化合物的mY與這些物質(zhì)的氣相色譜保留指數(shù)RI的定量結(jié)構(gòu)/保留相關(guān)關(guān)系模型。

Previous studies have showed that bicyclic alkanes and MMAs biomarkers in sediment are related to the parent material import of Botryococcus braunii.

前人研究表明欧美激情黑人，葡萄藻可能是地質(zhì)體中兩環(huán)倍半萜和單甲基支鏈烷烴的重要母質(zhì)來(lái)源aa美国一级性爱片。

The results show that the formation of dry gas is abided by reaction mechanism involving the cleavage of pentacoordinated Carbonium ion which is formed by the protonation of alkanes over acidic catalyst.

結(jié)果表明，烷烴分子首先在催化劑酸性中心作用下發(fā)生質(zhì)子化反應(yīng)毛片直播在线，烷烴分子鏈上易受到氫質(zhì)子進(jìn)攻的位置一般在其叔碳原子或碳鏈中心碳原子附近的C—H鍵或C—C鍵處欧美精品极品高清免费，形成兩種反應(yīng)過(guò)渡態(tài)物種——五配位正碳離子H-Carbonium和C-Carbonium。

The elaboration of systems that are able to mimic those enzymes should provide very important tools for three main purposes:(1) the development of new catalysts for important reactions in industrial and fine chemistry, such as the selective oxidation of alkanes and the stereoselective epoxidation of alkenes;(2) the prediction of the oxidative metabolism of new biologically active molecules such as drugs.(3) mimetic peroxidase of high catalytical activity and selectively is very important in bio-analytical field.

建立一系列關(guān)于這些酶的模擬體系將為以下三個(gè)方面的研究工作提供非常重要的工具：（1）工業(yè)或者精細(xì)化工方面重要反應(yīng)新型催化劑的開(kāi)發(fā)久久久久99，例如烷烴的選擇性氧化以及具有立體選擇性的烯烴環(huán)氧化91足交在线；（2）新的生物活性物質(zhì)，例如藥物的氧化機(jī)理的研究和預(yù)測(cè)天堂大秀一级黄片；（3）具有合適底物的高活性過(guò)氧化物酶模擬酶在生化分析領(lǐng)域的前景欧美激情性爱视频小说。

The biomarkers such as the n-Alkanes, the isoprenoids, the terpane, and cholestane were detected through GC-MS analysis. Based on the study of the biomarkers, the biological evolution during Permian and Triassic can be divided as three stages, namely, the mixing source stage of low biota such as thallose and advanced plant in late Permian (below bed 63), the stage of low biota such as thallose in the boundary transitional layer (bed 63-69) and the mixing source stage of advanced plant and low biota such as thallose in early Triassic (above bed 69). What's more, the second stage near the boundary transitional layer can be subdivided into 4 stages. The stages of biota evolution is close related with sedimentary environment changing and the boundary transitional layer.

利用GC—MS分析技術(shù)，在陸相地層中檢測(cè)出正構(gòu)烷烴一级av无码、類異戊二烯烷烴海外黄色视频、萜烷和甾烷類生物標(biāo)志化合物并根據(jù)生物標(biāo)志化合物和特征值研究，將二疊系—三疊系生物演化劃分為三個(gè)大的階段国产尤物视频一区，即晚二疊世的菌藻類低等生物與高等植物混源階段（63層以下）视频一区二区公开，界線異常層的菌藻類低等生物階段（63-69層）和早三疊世高等植物與菌藻類低等生物混源階段（69層以上），界線附近異常層的第二階段又進(jìn)一步細(xì)分為4個(gè)次一級(jí)階段黄色毛片日韩无码，生物演化階段與沉積環(huán)境變化及界線異常層具有非常密切關(guān)系国产精美自拍视频91。

The main conclusions of this thesis were as follows: 1 Through compared the original peaks, relative concentration distribution and diagnostic ratios of normal alkanes,Naphthalene, Dibenzothiophene, Fluorene, Phenanthrene, Chrysene and their alkyl PAHs, terpane-sterane biomakers of five crude oils, it was confirmed that five single crude oil was unmatched each other.

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