室内型胶合板天然耐久性的初步研究

作为一项反映材料优劣的重要的评价指标,天然耐久性直接决定了材料的使用寿命.笔者通过对胶合板胶合强度性能连续14年的跟踪测定,讨论和分析了胶合板的天然耐久性.最后总结出了胶合板在使用过程中随时间迁移其胶合强度性能随外界变化的规律,以期为胶合板的生产制备、生产工艺的改进及其应用领域的拓宽等方面起到一定的指导作用.     

TheEstimationofStemTaperCurvefromtheRadialInformationatThreeLocationsontheStem

该文探讨了不用编制削度表直接建立高精度立木干曲线的方法．当采用干曲线是３次多项式时，通常根据１０分法测定树干各部位直径，用最小二乘法求出该方程式的参数．从数学角度，只要知道树干任意３个部位的直径，就可以用最小二乘法或联立方程式求解干曲线参数．本文以樟子松为例，探讨用树干哪３个部位直径拟合的干曲线最接近实际干曲线，为建立立木干曲线提供有效方法．利用９个部位半径（方法Ⅰ）和利用其中３个部位半径（方法Ⅱ，２８种组合）分别拟合干曲线，结果表明方法Ⅱ的６种半径组合的精度良好，其中的３种组合，（ｒ１．３，ｒ０．３，ｒ０．７），（ｒ１．３，ｒ０．４，ｒ０．７）和（ｒ１．３，ｒ０．４，ｒ０．８）是拟合现实干曲线的有效方法．     

Lack of effect of recombinant bovine interferon alpha I1 in the treatment of experimentally-induced bovine warts.

Fifteen four-month old calves were inoculated, on five scarified sites on each side of the neck, with a suspension of ground wart tissue from a steer naturally infected with bovine papilloma virus 1. Warts started to appear about one month postinfection and were measurable in ten calves two months postinfection, when the trial started. After stratification on the size of the warts, all fifteen calves were allocated randomly to one of the following treatment groups: twice weekly intramuscular injections of 5 mg recombinant bovine interferon alpha I1 (rBoIFN alpha I1), weekly injection of 5 mg of rBoIFN alpha I1 or placebo, for three weeks. The biggest wart on each calf at the beginning of the trial was measured and photographs of all warts were taken weekly for five weeks. An analysis of covariance on the log of the volumes of warts during the five weeks of the trial showed a significant difference between groups (p = 0.026). Warts in treated groups tended to grow faster than in the placebo group.     

二十三个柚品种特性评价

对1965年定植的23个柚(Citrus grandis Osbeck)品种进行了20多年的性状比较。筛选出矮化类型6个,早熟和晚熟类型各3个,丰产类型6个,品质优良类型11个。发现仅有部分柚品种富含维生素C;果汁中维生素C含量与酸含量呈明显负相关。证实长寿沙田柚中的冬瓜圈和古老钱两个选系比广西沙田柚更丰产优质;垫江白柚质优,但产量低。简述了各参试品种的利用前途。     

Alkaline phosphatase isoenzymes in feline serum using an agarose gel alkaline phosphatase kit method.

Total serum alkaline phosphatase (ALP) activity is the product of the combined activity of isoenzymes from a number of tissue sources. In this study, a commercially available kit for electrophoretic separation of ALP isoenzymes in an agarose gel was used to separate ALP isoenzymes in feline tissue extracts and serum. Five separate bands of ALP activity were identified. These bands were numbered 1 to 5 with band 1 having the most anodal migration. The tissue of origin corresponding to the migration position of the isoenzymes are as follows: Band 3 was the liver isoenzyme, band 4 was the bone isoenzyme and ALP isoenzymes of both intestine and kidney migrate in the position labelled band 5. Band 1 appears to be related to albumin and does not represent true ALP activity. The tissue source of band 2 (a and b) was not identified. Serum ALP activity of mature, healthy cats is primarily of liver origin. Immature cats (< 1 year of age) have a greater proportion of the bone isoenzyme in the serum.     

刺槐抗旱造林技术的研究

在不同类型区及不同立地条件下，研究了提高剌槐成活率和生长量的抗旱造林技术。结果表明，采用径流集存、吸水剂蘸根、覆膜覆草及幼林地少量施肥技术，均可显著提高剌槐造林成率与生长量，提高幅度为２．０％－８．９％和１４．５％－８７．５％。采用混草技术可增收可观的优质牧草，经济效益和生态效益显著。