The results showed that POD activity increased at first and then decreased in the skin and flesh of root. The peak occurred at 40 d and 60 d in the skin and flesh, respectively. POD activity in the skin was higher than that in the flesh at 30 d and then contrary results were observed. The higher POD activity was, the more POD isoenzyme was. The pattern of POD isoenzymes was different between skin and flesh at different vegetative growth stages. POD isoenzymes in the skin were composed of five monomers and four dimers while five dimers or two monomers, two dimers and one tetramer in the flesh. POD isoenzymes in the root were mainly acidic. POD localized mainly in the cell walls of periderm, cambium, xylem ray, xylem vessels and primary xylem.

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The tryptophan residues play important roles in DNA photoreactivation catalyzed by CPD photolyases. We have investigated the action mechanism concerning Trp in DNA photoreactivation, and obtained the results as follows: 1 We proposed a mechanism of photosensitized splitting of CPDs by Trp and Trp-containing peptides. 2 Quantum yields of splitting of the model compounds that a Trp linked covalently a CPD were obtained under 290 nm light in various solvents, these values changing with solvent, range from 0.01 to 0.5. 3 Utilizing pulse radiolysis technique, splitting processes were observed in aqueous solution of the CPDs with hydrated electron and some oxidative species (such as hydroxyl radical, bromic radical and azide radical), and obtained their rate constants. In the case of interaction between CPD and hydrated electron, splitting of the CPD anion, and pyrimidine anion transfer an electron to FAD or Rf, were observed. The process rate was slower one order more than that in photolyase. Minor, but highly mutagenic UV-light-induced lesions are (6-4) photoproducts, which are repaired by (6-4) photolyases. These enzymes, discovered in 1993, are not well characterized and their mechanism is still under investigation.

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The results show that isobutene oligomerization is fast liquid-solid reaction. Under the temperature of 80 ℃～120 ℃ and pressure of 2.0 MPa, the products of oligomerization are mainly dimers and trimers of isobutene. The yield of trimers is higher than that of dimers and the mass fraction of trimers decreases with reaction temperature increasing. The yield of tetramers is much lower than that of dimmers and trimers. The tetramers are formed by reaction of isooctenes and C8 carbonium ion.

結(jié)果表明，異丁烯齊聚反應(yīng)為快速液固相催化反應(yīng)久久机这里只有精品，在80 ℃～120 ℃免费被操视频在线观看，2.0 MPa的實(shí)驗(yàn)條件下，反應(yīng)產(chǎn)物主要是異丁烯的二聚物和三聚物男女无遮挡全过程免费视频，且三聚物的收率遠(yuǎn)高于二聚物不下载看a人免费大片，兩者的濃度比值隨反應(yīng)溫度的升高而下降；少量四聚物的生成主要源于碳八烯烴與碳八正碳離子的反應(yīng)cao美女视频。

The reactions involved in the co-curing are: cyclodimerization and cyclotrimerization of cyanates, polyetherfication of epoxy groups and cyclotrimerization of cyclic dimers, as well as the formation of oxazolidinone rings.

反應(yīng)歷程首先是氰酸酯發(fā)生自聚反應(yīng)形成二聚體或三聚體无套系列.梦久久，然后二聚體可進(jìn)一步共聚形成三嗪環(huán)，此過程伴隨著環(huán)氧基的聚醚反應(yīng)精品久久久黄视频网站，最后是三嗪環(huán)與剩余的環(huán)氧基反應(yīng)形成NFDA1唑烷酮性爱黄色视频A片。

In order to decrease copolymerization loss of isoprene during thermal dimerization of cyclopentadiene in C5-fraction,the effect of three inhibitors,diethylhydroxylamine,p-tert-butylcatechol and o-nitrophenol,on dienes' polymerization in the process was investigated by experiment with sealed glasstube.

為減少C5餾分環(huán)戊二烯熱二聚過程中異戊二烯的聚合損失，采用封管實(shí)驗(yàn)方法考察了添加阻聚劑二乙基羥胺无码一级做a爱过程免费视频、對叔丁基鄰苯二酚被插黄色视频、鄰硝基苯酚對熱二聚過程中各二烯烴組分聚合程度的影響。

The synthesization technics of MPEG- MAA was studied in this paper,which is an important intermediate used for preparation of polycarboxylate superplasticizer.

本文對制備聚羧酸系減水劑的重要中間體——甲基丙烯酸聚乙二醇單甲醚酯的合成工藝進(jìn)行了研究免费A片性爱吸奶头视频，考察了反應(yīng)時(shí)間欧美日本草逼、催化劑對甲苯磺酸的用量、阻聚劑對苯二酚的用量www.黄色片com、反應(yīng)溫度及甲基丙烯酸與聚乙二醇單甲醚的用量比對酯化率的影響天堂网在线资源欧美人XXXX日韩。

The dimer acid and polyamide resin synthesis technology which use Sichuan bentonite as primarily catalyst by our company researched and developed greatly surpassed the domestic same industry on product quality and product yield (dimer acid colour:≤7#, viscosity: 5000~10000 cp/250C can control at will, the yield is higher than the same industry 8~10%). Serialized product plan: dimer acid, monomer acid, co-soluble polyamide resin, alcohol soluble polyamide resin, liquid polyamide resin and polyamide hotmelt adhesive, let the enterprise can adjust the product mix nimbly and can respond to market easily in the intense market competition.

公司研發(fā)的以四川膨潤土為主催化劑的二聚酸合成技術(shù)，在產(chǎn)品質(zhì)量和產(chǎn)品收率上均大大優(yōu)于國內(nèi)同行業(yè)（二聚酸色澤≤7#免费日韩黄色片品尚网，粘度在5000～10000cp/250C之間可調(diào)国产精品2018不卡在线观看，收率高于同行業(yè)8~10%）；系列化的產(chǎn)品方案：二聚酸精品视频国产狼友第28页、單體酸日韩网络福利直播网站在线观看视频、共溶聚酰胺樹脂、醇溶聚酰胺樹脂性欧美野外激情、液體聚酰胺樹脂及聚酰胺熱溶膠欧美性网入口，讓企業(yè)在激烈的市場競爭中，可靈活調(diào)整產(chǎn)品結(jié)構(gòu)女生被男生操的黄色网站，做到應(yīng)對市場游刃有余www,国产原创Com。。

Calcium dimer acids and zinc dimer acids were prepared by double decomposition reaction,and their structures were identified by IR.Their effects on heat stability of PVC were tested by way of Congo Red Method and Heating Method.Calcium dimmer acids and zinc dimmer acids were compared with traditional calcium stearate and zinc stearate.

通過復(fù)分解法制備了二聚酸鈣和二聚酸鋅，并通過紅外檢測證明了其結(jié)構(gòu)A片网站视频在线观看；采用剛果紅法另类黑人欧美啪啪亚洲图片、熱烘法研究了二聚酸鈣和二聚酸鋅對PVC的熱穩(wěn)定作用，并與傳統(tǒng)的硬脂酸鈣人人操午夜精品、硬脂酸鋅熱穩(wěn)定劑作了比較国产91精选无码观看。

The catalyst for IB dimerization, reactive site, reactive mechanism and dynamics research date was reviewed in this paper and try to explain the mechanism of selectivity enhancing by adding Tertiary butyl alcohol during IB dimerization and provide reference for the study of dimerization afterwards.

本文對異丁烯二聚催化劑手机看黄色网站亚洲、反應(yīng)活性位、機(jī)理及動力學(xué)研究成果進(jìn)行了綜述国产在线AAAAAA片，試圖解釋在異丁烯二聚時(shí)久久99高清视频，加入的叔丁醇對二聚反應(yīng)選擇性提高的作用機(jī)理，為今后二聚反應(yīng)的研究提供參考高清无码aaaaa特级黄色视频免费看视频。

The optimum conditions for this reaction were confirmed: the mole ratios of the Lewis base and AlCl〓 with the electron-rich aromatic monomer are 1. 2 and 3. 4, respectively; 1, 2-dichloride ethane is the most suitable solvent in this reaction; The solution of the two reactants must be added slowly to a large amount of solvent containing catalyst under pseudo-high dilution conditions; The Lewis base, such as NMP, DMF are applicable in this reaction system.

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