株

As shown by the result, the biomass and astaxanthin content of oceanic red yeast was reduced due to the presence of β-ionone which inhibited the synthesis of carotenoids. The lethality rate of oceanic red yeast would attained 92.3% if 370 mg/L of the β-ionone concentration was contained in the plate medium. The oceanic red yeast mutated by ethyl methane sulfonate was cultured on plate medium containing 370 mg/L of the β-ionone. 200 mutants were randomly screened, positive mutants with increased the biomass, astaxanthin volumetric yield and astaxanthin specific yield accounted for 18% of the total strain, the mutants with higher biomass, astaxanthin volumetric yield and astaxanthin specific yield higher occupied 22.5%, 45% and 46%, respectively.

实验结果表明，在β-紫罗兰酮存在的情况下，由于类胡萝卜素合成受到抑制，海洋红酵母的生物量和虾青素合成量都减少；当平板培养基中β-紫罗兰酮浓度达到370 mg/L时，海洋红酵母的致死率为92.3%；在这种平板培养基上涂布经甲基磺酸乙酯诱变的海洋红酵母，随机筛选200个菌落，结果表明生物量、虾青素体积产率和细胞产率均有所提高的正突变株占18%，生物量、虾青素体积产率和细胞产率的单项指标有所提高的正突变株分别占22.5%、45%和46%。

HO-69,a strain producing antibacterial substance ,was isolated from healthy oral cavity,and was identified by API system as Lactobacillus plantarum.

从健康成年人的口腔中筛选出一株产抑菌物质的菌株HO-69，经API系统鉴定为植物乳杆菌。

A Actinomycete strain producing a broad-spectrum antifungal substance was isolated from the soil of the Qinling mountain in Shaanxi. The strain numbered Z139 was initially identified as a variety of Micropolyspora rabrobranea.

从陕西秦岭山区采集的土样中分离到1株具有广谱抗真菌活性的放线菌菌株Z139，经初步鉴定为小多孢菌属红棕褐小多孢菌的一个变种。

Contents of saccharides,proteins,proline,glycine,leucine,isoleucine,tyrosine,and

个别"两用系"的不育株与可育株花蕾酯酶和细胞色素氧化酶同工酶谱也有一定差异。

The results indicate that both the precipitates produced by Leptospirillum ferriphium strain DY and Acidirhiobacillus ferrooxidans strain GF are composed of jarosite and ammonium jarosite. However, the content of jarosite in the precipitates synthesized by strain GF is 5.53% higher than that synthesized by strain DY, but the content of ammonium jarosite in the precipitates synthesized by strain DY is 15.24% higher than that synthesized by strain GF.

结果表明：无论是嗜铁钩端螺旋菌DY菌株，还是嗜酸氧化亚铁硫杆菌GF菌株合成的沉淀都是黄钾铁矾和黄铵铁矾的混合物；其中，GF合成的沉淀混合物中黄钾铁矾的含量比DY合成的黄钾铁矾约高出5.53%；而DY合成的沉淀中，黄铵铁矾的含量比GF合成的沉淀中的黄铵铁矾的含量约高出15.24%。

Karyotype analysis was performed for the cultured cells of passages 10, 20, 30, and 35 to evaluate their genetic stability.

分别对建株前和建株后10、20、30、35代的细胞株进行染色体核型分析。

Fig.1 cDNA sequence of HEV isolates from l to 6 are China, Pakistan, Kirghiz Republic,Burma,Indian and Mexico

1为中国株，2～6分别为巴基斯坦，吉尔吉斯坦，缅甸，印度，墨西哥株

Lactic acid bacteria were isolated and its biological properties were studied from Kumiss products collected from the pastoral area in Xilin Guole.

从内蒙古锡林郭勒牧区采集马奶酒样品，进行了乳酸菌的分离及其生物学特性的研究，分离到9株乳球菌，分别归属于3个属6个种，这些菌株能够产酸凝乳，发酵乳的风味纯正，适宜生长温度范围较宽，适合做乳制品的发酵剂。

Objective: To study the optimal condition on lactase production by yeast Kluyveromyces fragilis to increase the enzyme productivity.

摘 要：目的：为进一步提高产乳糖酶酵母Kluyveromyces fragilis株的酶产量，对该菌株的培养产酶发酵条件进行优化试验。

Strains of bacteria were isolated from 35 samples, among of them 31 strains were lactic acid bacteria.

从 35 个乳样中分离到 66 株菌，其中 31 株被鉴定为乳酸菌。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。