Results show that Calamagrostis angustfolia wetland is higher than cropland in content of total sulfur and available sulfur, which indicates cultivation depletes soil S, and soil total sulfur and available sulfur show a decreasing trend with each passing year.

結(jié)果表明18禁止在线，小葉章濕地土壤總硫和有效硫含量高于開墾后的農(nóng)田土壤欧美一级操b视，開墾導(dǎo)致土壤硫含量下降www.自拍偷拍.com，且隨著耕種年限的增加欧美图片视频小说，土壤總硫和有效硫含量呈逐年下降趨勢。

Firstly, 3-ethylthiobutanal was prepared from crotonaldehyde reacting with ethanehiol in triethylamine with high yield. Secondly, methyl acetoacetate was converted to 6-ethylthiohept-3-en-2-one by three steps via hydrolysis, condensation with 3-ethyltio-butanal and dehydration, then 6-ethylthiohept-3-en-2-one was cycloco ndensed with dimethyl malonate by Michael addition and Claisen condensation, followed by saponification and decarboxylation to give the intermediate of 5-(2-ethylthiopropyl)-cyclohexane-1,3-dione.

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Ergothioneine is a kind of precious amino acid, and it is also a natural antioxidant. It plays an important role to prevent the oxidative damage in organism. Ergothioneine cannot be biosynthesized in humans, only can be absorbed from the diet. In recently the research discovered the high content of ergothioneine in the mushroom. Content of ergothioneine of Pleurotus eryngii is the highest from 28 kinds of mushrooms, therefore the research untilized P. eryngii to make the products of P. eryngii-fermented adlay and P. eryngii-fermented buckwheat which content high ergothioneine. Also, we analyzed their proximate composition, nutritional components, taste and physiologically active components, antioxidant properties and evaluation of anti-imflammatory effect.

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It depicts the species of microbesThibacillus ferrooxidans,SRB,filaceous sulfur bacteria,synthetic sulfur bacteria,colorless(sulfur bacteria and thiobacillus denitrificans,their metabolism pathway,treatment capability and key affecting factors of processes,and their disadvantages and advantages.

敘述了煙氣吸收和吸收尾液的處理工藝所利用的脫硫微生物種類，并闡述了氧化亞鐵硫桿菌全网最大的黄色网站免费观看、硫酸鹽還原菌为爱iGao激情视频、絲狀硫細(xì)菌、光合硫細(xì)菌亚洲精品电影你懂的在线观看、無色硫細(xì)菌和脫氮硫桿菌的代謝途徑国产精品无码AV在一区、作用效果和關(guān)鍵影響因素，并且指出其優(yōu)缺點(diǎn)欧美日韩午夜情爱在线播放网站。

It depicts the species of desulfurizing microbes (Thibacillus ferrooxidans, SRB, filaceous sulfur bacteria, synthetic sulfur bacteria, colorless sulfur bacteria and thiobacillus denitrificans), their metabolism pathway, treatment capability and key affecting factors of different processes, and their disadvantages and advantages.

敘述了煙氣吸收和吸收尾液的處理工藝所利用的脫硫微生物種類先锋影音亚洲中文字幕5566，并闡述了氧化亞鐵硫桿菌、硫酸鹽還原茵亚洲无码强奸视频在线观看、絲狀硫細(xì)菌午夜免费播放成人无码电影视频、光合硫細(xì)菌、無色硫細(xì)菌和脫氮硫桿菌的代謝途徑日本三级电影在线视频、作用效果和關(guān)鍵影響因素一级黄色视频在线免费播放A级，并且指出其優(yōu)缺點(diǎn)。

A reversed-phase high performance liquid chromatographic method was established for determination of isothiocyanates in human urine , which used the reaction of propyl isothiocyanate with 1,2-benzenedithiol as reference instead of the synthesis of 1,3-benzodithiole-2-thione.

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Synthesis of organic sulfuric compounds in aqueous media is carried out by: using thio-olefin compounds with carbonyl compounds, acetal/keltone, hydrazone, oxime, osazone and enamine to synthesize mercaptal/keltone compounds in aqueous media; using thio-olefin compounds with alpha-hydroxyaldehyde/keltone or alpha-halogenated aldehyde/keltone to synthesize thia-olefin derivatives in a queous media; using thio-olefin compounds with alpha, beta-unsaturated hydroxy compounds, C-C treble bond, C-N treble bond, C-C double bond, N-N double bond, C-N double bond, C-S double bond, epoxy and its derivatives, aziridine and its derivatives, cyclopropane and its derivatives and halogenated carboxy to synthesize sulfoether compounds in a queous media.

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It is necessary to carry out a thorough study on pest control technology with DMDS, with an expectation of obtaining a new fumigant of methyl bromide alternative.2. Investigation of the toxicity of fumigation on adult and mixed stages of the three most tolerant insect species -- Sitophilus oryzae, Rhyzopertha dominica and Tribolium castaneum -- under a range of EtF、DMS and DMDS doses in a Flow-through Fumigation System shows that the FTFS procedure offers a constant concentration of fumigant with low CO2 concentrations and ensures that the fumigant toxicity is effectively not compromised by CO2. In comparison with chamber fumigation method, the toxicity data of EtF男人视频天堂剧情111、DMS and DMDS obtained from this experiment is more accurate by using FTFS.

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The mechanism of thiocarbonyl compounds with thiourea function group has been proposed according to the photoreaction products.5. Total of one heterocyclothione intermidate and four heterocyclothione compounds have been synthesized and structurally characterized.

根據(jù)所得到的產(chǎn)物對具有硫脲基團(tuán)的硫羰基化合物的光反應(yīng)機(jī)理進(jìn)行合理的推測。5黄片一级二级三级黄、合成與表征了1個環(huán)硫酮中間體和4個雜環(huán)硫酮類化合物最新91地址偷自在线永久入口，摸索出合成雜環(huán)硫酮中間體較佳反應(yīng)條件。

The removal of organic sulfur such as thiofuran , thioether and mercaptan is the main objective of dry desulfurization , and hydroconversion of organic sulfur and preventing the methanation side reaction are the technological difficulties of hydroconversion desulfurization. The combination of two-level conversion and two.1evel absorption is the preferential scheme for refined removal of high-concentration organic sulfur.

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