戊基的

Earthworms might be a good bioindicator for the contamination of roxarsone to soil. No significant influence of roxarsone contamination upon the biomass and the reproductive ability of earthworms was found, which indicated that earthworms could tolerate heavy contamination of roxarsone. 2. Effects on the important enzymatic system of earthworms The activities of PROD, BROD and MROD in P450 family were inhibited.

对蚯蚓体内重要酶系统的影响洛克沙胂对P450酶系中的PROD（7-戊氧基异吩噁唑酮-O-脱乙基酶）、BROD（7-苄氧基异吩噁唑酮-O-脱乙基酶）和MROD（7-甲氧基异吩噁唑酮-O-脱乙基酶）的活性都有抑制作用，对MROD的抑制作用最明显；在抗氧化酶系统中，对过氧化氢酶在整个试验进程中都有激活作用，而对其他抗氧化酶有时起激活作用，有时起抑制作用，规律性不明显。

They were eucalyptol, bicyclo［2.2.1］heptan-2-one,1,7,7-trimethyl-,(1R)-, borneol, 1-methyl-2-(1-methyl ethenyl)-(1R-cis)-cyclobutaneethanol, limonene, 1-hydroxymethyl-7,7-dimethy lbicyclo［2.2.1］heptan-2-one,-spathulenol, 3,7,11,15-Tetramethyl-2-hexadecen-1-ol, isocitronellol,-9-Octadecenoic acid, heneicosane, respectively.

阿给中共有11个阿给炭没有检测出的成分，包括桉油精、D-樟脑、冰片、(1R-cis)- 1-甲基-2-(1-甲基乙烯基)环丁基乙醇、二戊烯、1-羟甲基-7，7-二甲基-双环［2.2.1］庚-2-酮、-匙叶桉油烯醇、3，7，11，15-四甲基-2-十六碳烯-1-醇、异香茅醇、-9-十八碳烯酸和廿一烷。

The biosynthesis of the quinoid nucleus are the same in all coenzyme Qs. The biosynthesis of the isoprenoid side chain determine the kind of coenzyme Q.

芳香环的合成在所有的辅酶Q族物质中都是相同的，异戊烯基侧链的长度则决定了辅酶Q的种类，这里存在一个关键酶，即异戊烯焦磷酸合成酶。

The auxiliary can be recovered in high yield (81%) only by filtering and recrystallization. Besides, some other aldehydes have been chosen to test the enantioselectivity of N,N\'-dibenzyl tartamide, in comparison with two other allylaborates reagents developed previously by Roush and Brown, respectively. The results show that %e.e. of homoallylic alcohol is superior to that of the former, and approaches the Brown reagent.

产物经S_N2反应得瑞格列萘中间体-甲基烯丙基-2-氯苯基-叠氮甲烷(17)；同时，将筛选出的新型手性配体N-苄基酒石酸二酰胺用于其他几种醛(正丁醛，异戊醛和环己醛)的不对称烯丙基化反应，并与广泛应用的Roush配体(22)和Brown配体(27)相比较，发现其立体选择性优于Roush配体，并接近Brown配体，但明显具有可回收利用的优势。

Trifluoromethyl-3-heptadfluoroisopropyl-2-perfluoropentene-4-(N',N'-dimethylamino propyl) imino was prepared by the reaction of hexafluoropropene timer with N,N-dimethyl propanediamine in the molar ratio 1:1.0 at room temperature for 8h, and the structures of VIII were identified by IR and NMR spectra.

以六氟丙烯三聚体与N，N-二甲基丙二胺为原料合成叔胺2-三氟甲基-3-七氟异丙基-2-全氟戊烯-4-(N'，N'-二甲胺丙基)亚胺，利用红外光谱和核磁共振确定其结构，并通过对合成条件的考察得其最佳合成条件：乙醚为溶剂，碳酸钠为缚酸剂，摩尔投料比为1：1.0，在室温下反应8小时。

When Gluma is applied in vivo, two reactions occur: first, GA reacts with part of the serum albumin in dentinal fluid, which induces a precipitation of serum albumin; and, second, the reaction of GA with serum albumin forms dihydropyridinium, whose disproportionation gives rise to free radicals, and the free radicals induce the polymerization of HEMA.

首次提出Gluma的脱敏机理为：当Gluma涂在过敏的牙本质上时，首先戊二醛交联牙本质液中的血清蛋白并产生沉淀；同时戊二醛与血清蛋白的反应产生二氢吡啶盐，它发生歧化反应，歧化过程中会有自由基产生，从而引发HEMA 聚合，生成另外一部分沉淀，这两部分沉淀共同堵住牙本质小管，起到了脱敏作用。

Isopentanol, nitrochlorobenzene, nitrotoluene and diethylbenzene were well separated in the range of optimal carrier gas velocity of 13~17cm/s.

SE-30系列毛细管色谱柱的最佳载气线这范因为13~17cm/s，且在最佳线速度下很好地分离了异戊醇、硝基氯苯、硝基甲苯及二乙苯同分异构体体系。

Using silicotungstic acid as catalyst with the catalyst supported on active carbon,2-methyl-2-ethyl-acetic-1,3-oxathiolane(targeted compound I,an aroma compound with apple flavor )was synthesized by the reaction of ethyl aceto-acetate and 2-mercapto-ethanol.

以活性炭固载硅钨酸作为催化剂，用乙酰乙酸乙酯与巯基乙醇缩和合成了具有浓郁苹果香气的香料化合物2-甲基-2-乙酸乙酯基-1，3-氧硫杂环戊烷。

Results The mixing, loading and storing processes of the construction, might generate lots of occupational hazards, including toluene, dimethylbenzene, trimethylbenzene, isopropanol, butyl alcohol, propanol, methyl methacrylate, butyl acetate, methyl isobutyl ketone, methyl ethyl ketone, acetic ether, nitro-cotton, n-hexane, n-heptane, carbinol, ethanol, ethyl propionate, diisobutyl ketone, glycol ether, isoamyl acetate, 2,4-toluene diisocyanate, isophorone, noise, power frequency electric fields.

结果 该项目在混兑生产和装卸、仓储过程中，可能产生的职业病危害因素主要有甲苯、二甲苯、三甲苯、异丙醇、丁醇、丙醇、甲基丙烯酸甲酯、乙酸丁酯、甲基异丁基甲酮、丁酮、乙酸乙酯、硝化棉、正己烷、正庚烷、甲醇、乙醇、乙酸丙酯、二异丁基甲酮、乙二醇乙醚、乙酸异戊酯、2，4甲苯二异氰酸酯、异佛尔酮、噪声、工频电场。

By the bio-assay directed fractionation of the volative constituents.dimethyl disulfide,allyl methyl trisulfide,allyl methyl sulfide and diallyl disulfide were found to increase the beating rate and beating amplitude in a standard medium,but the compund 2-pentanone without sulfide did not affect either of them.

从具有生物活性的挥发性提取物中分离得到的二甲基二硫、烯丙基甲基三硫、烯丙基甲基硫醚和二烯丙基二硫对培养心肌细胞心率和振幅均有不同程度的增强作用，而不含硫的2-戊酮则没有作用。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。