黑龙江省三江平原丹顶鹤的数量分布

在地面调查的基础上,我们使用Y-11轻型飞机对黑龙江省三江平原地区的丹顶鹤的数量分布近行了调查,调查时飞行高度80米,航速140公里/小时,续航里程共3748公里。调查结果表明,丹顶鹤在三江平原主要分布在8个地区,其中嘟噜河下游、洪河自然保护区、七星河流域和兴凯湖低地是主要繁殖地,总数量共309只。     

四川省西部鱼类寄生粘孢子虫——1.粘体虫属六新种(粘孢子纲:双壳目)

本文报导四川省西部鱼类寄生粘孢子虫粘体虫属六新种,即异型粘体虫,新种Myxosoma disparis sp.nov.,四川粘体虫,新种Myxosoma sichuanensis sp.nov.,光唇粘体虫,新种Myxosoma acrossochilusi sp.nov.鳅粘体虫,新种Myxosoma nemachilusi sp.nov.斜囊粘体虫,新种Myxosoma obliqua sp.nov.,雅安粘体虫,新种Myxosoma yaanensis sp.nov.。     

云南叶螨属一新种(蜱螨目:叶螨科)

在鉴定云南叶螨标本时,发现叶螨属一新种,现记述如下。模式标本保存于上海农学院。本文量度单位均为微米。 食禾叶螨Tetranychus graminivorus新种(图1—14) 雌螨 体长(包括喙)454,宽298。椭圆形。浅黄绿色。须肢端感器圆柱形,长6.8,     

中国东北地区常见有瓣蝇类调查初步报告

与人类杂处的蝇类,在我国东北地区的分布情况尚少系统调查。作者于1956年5月、8月曾赴内蒙东北部(伊图里河、图里河),6月、7月赴营口、盘山(田庄台),借这些机会,顺便采集了蝇类标本;同年9月组内同志去绥中也采回部分标本;1957年5月至10月作者又赴吉林、辽宁两省各地进行了蝇类调查。其中有瓣蝇类已经定名的共计5科26属68种,有6种为国内新记录。兹将结果报告如下:     

吉林省寄螨亚科三新种(啤螨目:寄螨科)

本文记述寄螨亚科(Parasitinae)三新种。模式标本保存于吉林省地方病第一防治研究所。文内测量单位为微米,括号内为测量平均值。     

Enzymatic synthesis of trisaccharides and alkyl β-d-glucosides by the transglycosylation reaction of β-glucosidase from Fusarium oxysporum

Purified β-glucosidase from Fusarium oxysporum catalyses hydrolysis and transglycosylation reactions. By utilizing the transglycosylation reaction, trisaccharides and alkyl β-d-glucosides were synthesized under optimal conditions in the presence of various disaccharides and alcohols. The yields of trisaccharides and alkyl β-d-glucosides were 22–37% and 10–33% of the total sugar, respectively. The enzyme retained 70–80% of its original activity in the presence of 25% (w/v) methanol, ethanol and propanol. Thus, β-glucosidase from F. oxysporum appears to be an ideal enzyme for the synthesis of useful trisaccharides and alkyl β-d-glucosides.     

Studies of the effect of organic solvents on the stability of β-glucosidase fromFusarium oxysporum

Summary The effect of organic solvents on the stability of -glucosidase in a powder form, isolated fromFusarium oxysporum, has been studied using several organic solvents of different degree of hydrophobicity. It was found that -glucosidase remains quite stable after a prolonged incubation in the presence of most of the organic solvents used, even at temperatures as high as 70°C. Only dimethyformamide (DMF) and tetrahydrofuran (THF) reduce considerably the enzyme activity in a short preincubation period. Studies on the effect of the pH of the buffer used prior to lyophilization, as well as of exogenous added water to the incubation mixture, on enzyme stability show that it is more stable in pH 5.0 and in the lowest water content. In addition it was found that the presence of glucose in the lyophilization procedure gives a significant protection to the enzyme when it is incubated for 30 h in pentanol and n-hexane.