野生驯化鸡腿蘑新菌株“唐研一号”的生物学特性研究

通过研究表明，野生驯化鸡腿蘑新菌株“唐研一号”的生物学效率为１１９％－１５３５，平均为１４０％左右。其最佳母种培养基的配方为：麦秸２００ｇ，马铃薯２００ｇ，葡萄糖２０ｇ，琼脂２０ｇ，蛋白胨３ｇ，磷酸二氢钾１．５ｇ，硫酸镁０。．５ｇ，水１００ｍＬ，母种培养基最适ｐＨ６－７。     

Effect of Dietary Protein Concentration and Feeding Rate on Weight Gain,Feed Efficiency,and Body Composition of Pond-Raised Channel Catfish Ictalurus punctatus1

Two experiments were conducted in earthen ponds to evaluate the effect of dietary protein concentration and feeding rate on weight gain, feed efficiency, and body composition of channel catfish. In Experiment 1, two dietary protein concentrations (28% or 32%) and four feeding rates (≤ 90. ≤ 112, ≤ 135 kg/ha per d, or satiation) were used in a factorial arrangement. Channel catfish Ictalurus punctatus fingerlings (average size: 27 g/fish) were stocked into 0.04-ha ponds at a rate of 24,700 fish/ha. Fish were fed once daily at the predetermined maximum feeding rates for 282 d (two growing seasons). In Experiment 2, three dietary protein concentrations (24, 28, or 32%) and two feeding rates (≤ 135 kg/ha per d or satiation) were used. Channel catfish (average size: 373 g/fish) were stocked into 0.04-ha ponds at a rate of 17,300 fish/ha. Fish were fed once daily for 155 d. In both experiments, five ponds were used for each dietary treatment. Results from Experiment 1 showed no differences in total feed fed, feed consumption per fish, weight gain, feed conversion ratio (FCR), or survival between fish fed diets containing 28% and 32% protein diets. As maximum feeding rate increased, total feed fed, feed consumption per fish, and weight gain increased. There were no differences in total feed fed, feed consumption per fish, or weight gain between fish fed at ≤ 135 kg/ha per d and those fed to satiation. Fish fed the 28% protein diet had a lower percentage carcass dressout and higher percentage visceral fat than fish fed the 32% protein diet. Dietary protein concentrations of 28% or 32% had no effect on fillet protein, fat, moisture, and ash. Feeding rate did not affect FCR, survival, percentage carcass dressout, or fillet composition, except fillet fat. As feeding rate increased, percentage visceral fat increased. Fish fed at ≤ 90 kg/ha per d had a lower percentage fillet fat than fish fed at higher feeding rates. In Experiment 2, dietary protein concentration or maximum feeding rate did not affect total feed fed, feed consumption per fish, weight gain, FCR, or survival of channel catfish. Feeding rate had no effect on percentage carcass dressout and visceral fat, or fillet composition. This was due to the similar feed consumption by the fish fed at the two feeding rates. Fish fed the 24% protein diet had lower carcass dressout, higher visceral fat and fillet fat than those fed the 28% or 32% protein diet. Results from the present study indicate that both 28% and 32% protein diets provide satisfactory fish production, dressed yield, and body composition characteristics for pond-raised channel catfish fed a maximum rate of 90 kg/ha per d or ahove.     

大功率磁力驱动泵的研制

介绍了大功率磁力驱动泵的原理，结构设计、主要零件的材质选择及加工难点，并由此制作出性能令人满意的样机。     

用突变模型研究森林蓄积的稳定性(英文)

模型构造的方法是以Logistic方程描述生长量 ,假设采伐量为常量且等于生长量时 ,推导出折迭突变模型 .此模型有助于管理层制定管理决策 ,防止森林消亡 .该文又通过曲线采伐模型及Logistic生长模型推导出尖角突变模型 ,这个模型给出了采伐将导致突变发生的敏感区域 ,而且通过模型的滞后性使人们清楚地意识到森林一旦遭受破坏 ,再想恢复需入更大的力量     

施肥措施对大扁杏生理特征的影响

用根施Ｎ、Ｐ肥，叶面喷施稀土和硼砂三种方法，研究了施肥对大扁杏光合作用和抗旱性的影响，结果表明，在较好的立地条件下，每株施用Ｎ肥１．７８ｇ＋Ｐ肥８．４２ｇ的施肥量对大扁杏幼树作用不明显；在较差的立地条件（荒坡）下，不论土壤施肥，还是叶面施稀土和硼砂都能明显地提高大扁杏的光合作用和抗旱性，增加叶面积系数，并且得到了三种肥料的最佳使用量。     

南输成品油管道输送能力问题

介绍了南输成品油管道的实际情况，针对管道的最大输能力及最佳经济输量问题进行了分析讨论。     

大型屋面板制作主肋钢筋的改进

本文通过分析、计算、现场实践.采用高强钢丝Φ_5~k,取代原Ⅰ、Ⅱ级钢筋制作大型屋面板,结果表明.提高了强度等级.工期、观感、降低了工程造价.     

分光光度法检测微量甲醛和长效清应用过程中甲醛含量变化

采用乙酰丙酮分光光度法测定水中微量甲醛的含量。本法在４１４ｎｍ波长处有最大吸收，吸收值和甲醛含量之间有良好的相关关系，相关系数ｒ为０．９９９９９，用于样品检测的相对平均偏差小于２％，加标回收率在９５％－１０５％之间。显色可稳定达１小时。用本法检测长效清（复方甲醛）应用过程中甲醛浓度的变化，发现甲醛含量始终在其最初浓度的±１０％以内，非常稳定     

冬小麦越冬期茎尖超微结构变化与玉米赤霉烯酮的关系

应用酶联免疫技术和电镜技术，研究了冬小麦品种燕大１８１７越冬期内源玉米赤霉烯酮（ＺＥＮ）含量和茎尖超微结构的变化，结果表明，随着秋末冬初气温逐渐降低，日照缩短，茎尖ＺＥＮ含量逐渐增加，１１月下旬含量达到高峰，随后急剧下降，到１月下旬又出现一个小的含量高峰。在小麦茎尖ＺＥＮ含量出现高峰前后（１１月底，１２月初），茎尖细胞中线粒体和质体的体积增大，形状也发生变化，线粒体从低温诱导前的圆球形变为长形、哑     

浅析我国麻类产品的地位和开发前景

全面分析了世界主要麻类作物的地位,论述了麻类产品的开发前景。