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The optimal carbon source and nitrogen source were also determined as 20 g/L glucose, 15 g/L tryptone and 5 g/L beef extract, respectively.

经过对产酶条件的优化，确定最佳摇瓶产酶条件为：葡萄糖20 g/L，蛋白胨15 g/L，牛肉膏5 g/L，玉米浆15 g/L， KH2PO4 3 g/L， MgSO4·7H2O 0.5 g/L，初始pH 7.0，培养温度37℃，装液量20 mL/250 mL三角瓶，摇床转速200 r/min。

Let G = V(G,E be a simple graph with |V| vertices and |E| edges. Let |V|= p,|E|= q, if there exists f: V →{1,2,...,p} be an injective mapping, and define an inducedfunction f":E→{1,2,...,q} by setting f"=|f-f| for all∈E. If f maps E onto {1,2,...,q}, then f is said to be a Skolem-graceful labeling of G, the graph G is said to be a Skolem-graceful graph.

对一个给定的简单图G=V(G，E，|V|和|E|分别是图G的顶点数和边数，令|V|=p，|E|=q，如果存在一个一一映射f：V→{1，2，…，p}，使得对所有边∈E，由f′=|f-f|所导出的映射函数f′：E→{1，2，…，q}是一一对应关系，则称f是图G的一个Skolem优美标号，图G被称为Skolem优美图。

Results: The linearity range for the determination was 10~1500 μg/L for sulfanilamide, 50~1500 μg/L for sulfathiazole, 10~1500 μg/L for sulfamethoxazole and 10~1500 μg/L for sulfamethazine.

结果：磺胺、磺胺噻唑、磺胺甲恶唑和磺胺甲嘧啶的线性范围分别是：10~1500μg/L、50~1500μg/L、10~1500μg/L、10~1500μg/L；检出限分别为：8.3、12、7.9、9.1μg/L；回收率为

The Bi-Cayley graph BC of G with respect to S is defined as the bipartite graph with vertex set G ×{ 0,1} and edge set {(g, 0)(sg, 1): g ∈ G,s ∈ S}.

Bi-Caylcy图BC是一个二部图，它的顶点集为G×{0，1，边集为{(g，0)(sg，1)：g∈G，s∈S。

The AMF spore average density was 24.88 per 20 g soil , the species richness was 1.94 per soil sample, the species diversity index was 2.56, and the species evenness was 0.65. Glomus, but they all were of prominent genus in the investigation area and Acaulospora, Scutellospora were of common genus while Entrophospora was rarely found. In the 13 species AM fungi, G.mosseae was of prominent species, and G.geosporum, G.intraradices, G.etunicatum were of common speices, while the others were of rarely species. There were 87.5% sand fixation plant were infected with arbuscular mycorrhizal fungi, the highest spore density, the strongest infection strength of the whole roots and the best species richness belonged to Chenopodiaceae while Polygonacea was the lowest.

四属AM真菌中，Glomus为优势属， Scutellospora 、Acaulospora为常见属，Entrophospora则为稀有属；十三种AM真菌中，G.mosseae、G.geosporum分别为优势种、最常见种，G.intraradices，G.etunicatum为常见种，其余均为稀有种；五科固沙植物中，87.5%的植物能被菌根侵染，其中藜科植物孢子密度最高，整个根系侵染强度最强，种的丰度最高，蓼科植物孢子密度、整个根系侵染强度、种的丰度则最低；禾本科植物不仅具有最好的丛枝结构，且具有相对高的亲和性，能与12种AM真菌共生。

If G is a {2K_1+K_2, C_4}-free graph, we show thatifα＞3 then G is a split graph, and ifα=3 then for any independentset S of cardinality 3, G-S is a chordal graph or G-S?

如果图G不含与4-圈和2K_1+K_2同构的导出子图，我们证明了如果α＞3，那么G是一个split图；如果α=3，那么对于G的任一个有三个元素的独立集S，G-S是一个弦图或者G-S？

The culture ingredients and conditions were optimized with the orthonormal table L_9(3~4) method. Studies showed that the culture components for optimization of β-mannanase production were yeast extract 20 g/L, Konjak powder 20 g/L,(NH_4)_2SO_4 2 g/L, KH_2PO_4 1 g/L and MgSO_4 · 7H_2O 1 g/L; and the optimal culture conditions were seed incubation time 8-12 h, inoculation ratio 6%, culture volume 25 mL, pH 7.5, fermentation temperature 40 ℃ and fermentation time 25 h.

通过正交设计方法筛选优化该菌培养基配方和产酶条件，培养基配方为：酵母抽提物20g／L、魔芋粉20 g／L、(NH_4)_2 SO_4 2 g／L、KH_2PO_4 1 g／L、MgSO_4·7H_2O 1 g／L；产酶条件为：菌种种龄8～12h、接种量6％、装液量25 ml、pH7.5、培养温度40℃、培养时间25h。

On the inhibition to mycelial growth, the 95% ethanol extract had significantly inhibition to P. ultimum, F. oxysporum f. sp cucumber, R. solani and B. cinerea, and at the top treatment concentration of 0.002 g/mL, the inhibition rate reached to 60.32% 58.50%, 55.89% and 55.17%, respectively; But the 95% ethanol extract almost had no inhibition to S. rolfsii, its rate was just 17.19% at 0.002 g/mL.③On the inhibition to sprouting, the 95% ethanol extract had significantly inhibition to B. cinerea, R. solani, F. oxysporum f. sp cucumber and P. ultimum, and at the top treatment concentration of 0.002 g/mL, the inhibition rate reached to 95.24%, 90.48%, 89.47% and 85.71%, respectively; and the rate would exceed 40% to four fungi mentioned above when their concentration was not lower to 0.005g/mL. The 95% ethanol extracthad infirm inhibition to S. rolfsii, its rate was just 43.48% at 0.002 g/mL.

在抑制菌丝生长方面，鱼腥草95%醇提物对豌豆根腐病菌、黄瓜枯萎病菌、马铃薯立枯丝核病菌和大白菜灰霉病菌均有良好的抑制作用，在最高处理浓度为0.002 g/mL时抑制率分别达到60.32%、58.50%、55.89%和55.17%；对辣椒白绢病菌几乎没有抑制作用，在最高处理浓度为0.002 g/mL时抑制率仅为17.19%；③在抑制孢子萌发方面，鱼腥草95%醇提物对大白菜灰霉病菌、马铃薯立枯丝核病菌、黄瓜枯萎病菌和豌豆根腐病菌抑制效果明显，在最高处理浓度为0.002 g/mL时的抑制率分别达到95.24%、90.48%、89.47%和85.71%，且在处理浓度不低于0.000 5 g/mL时对以上4种真菌孢子的抑制率超过40%；对辣椒白绢病菌抑制作用较弱，在最高处理浓度为0.002 g/mL时仅为43.48%。

The recoveries of chlortetracycline (0.01μg/mL、0.10μg/mL、0.20μg/mL、0.40μg/mL、2.00μg/mL) in muscle, liver and kidney were 92％～101％;:88％～04％; 79％～86％, respectively.

金霉素在0.01μg／mL、0.10μg／mL、0.20μg／mL、0.40μg／mL、2.00μg／mL五个添加水平上的平均回收率分别为：肌肉：92％～101％；肝：88％～94％；肾：79％～86％。

The optimal medium components were: sodium alginate 3 g/L,(NH4)2SO4 3 g/L, NaCl 20 g/L, KH2PO4 0.1 g/L, CaCl2 0.1 g/L; The optimal culture conditions were: 25 ml medium in 250 mL Erlenmeyer flask, inoculum's volume 3%, shaking speed of 150 r/min, initial pH 7.5, at 28°C for 24 h.

该菌株产酶的最佳培养基组成为：褐藻胶3 g/L、(NH4)2SO4 3 g/L、NaCl 20 g/L、KH2PO4 0.1 g/L、CaCl2 0.1 g/L；最佳培养条件为：250 mL三角烧瓶中装液量25 mL、接种量3%、摇瓶转速150 r/min、pH7.5、培养温度为28℃、培养时间为24 h。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐