苹果梨施用复合肥的研究

苹果梨园连续多年施用复合肥，土壤营养、树体营养得到明显改善。结果表明，盛果期梨树，在连年施有机肥的基础上，单株适宜施肥量为800g。花后一次性施人，既省工又省肥。     

Growth performance of weanling pigs fed corn-soybean meal diets with or without dried whey at various L-lysine.HCl levels

A total of 490 crossbred weanling pigs were used to evaluate the responses to and the subsequent interaction between dietary dried whey and crystalline L-lysine.HCl on postweanling growth and feed efficiency at two periods postweaning. The experiment was conducted as a 2 x 5 factorial arrangement of treatments in a randomized complete block design to evaluate two levels of edible-grade dried whey (0 or 25%) and five dietary lysine levels ranging from 1.10 to 1.50% in .10% increments using a corn-soybean meal mixture as the basal feedstuff. Pigs were allotted by weight, litter, and sex to seven replicates at weaning (23 +/- 2 d) and fed their treatment diets for a 35-d period. Daily gain and feed intake were greater (P less than .01) for both the 0- to 21- and the 22- to 35-d periods when dried whey was fed; the relative magnitude of the response to dried whey was greatest during the initial 21-d period. Growth responses during the 0- to 21-d period were, however, independent of dietary lysine level, suggesting that dietary lysine at a level of 1.10% is not the limiting nutrient in a corn-soybean meal diet or a corn-soybean meal diet with dried whey. From 22 to 35 d postweaning a linear growth response to lysine level occurred when the dried whey diet was fed, but no response was detected when lysine was added to the corn-soybean diet, resulting in a diet x lysine level interaction (P less than .10).(ABSTRACT TRUNCATED AT 250 WORDS)     

应用多元回归原理预测西门塔尔初产母牛305天产奶量

利用多元回归原理，对甘肃省家畜繁育中心种牛场22头西门塔尔种子母牛最高日产量（x1）、90d泌乳量（x2）与初产３０５d泌乳量（y）的关系进行研究，得出回归方程：y=303.23 32.73x1 2.167x2，显著性检验结果，Ｐ＜０.01，差异极显著。     

汞在兰州市多介质环境中的分布特征及成因初探

为探讨汞在兰州市多介质环境中的分布特征及成因，用金砂吸附及AMA254高级测汞仪测定了兰州市不同功能区大气、土壤和水体三介质中的总汞含量。结果表明，兰州市大气总汞浓度年平均值为28．62ng·m^-3，其中采暖期为48．48ng·m^-3，非采暖期为9．42ng·m^-3；兰州市土壤剖面汞含量的差异较大，表层汞含量高，最高峰值0．117mg·kg^-1，向下逐渐减少到土壤背景值；兰州市黄河水体中总汞浓度夏季高于冬季，夏季水体中汞以溶解态为主，冬季以颗粒态为主。由以上结果初步推论兰州市大气汞浓度显著受到人为活动的影响，且工业污染源和生活污染源均对大气汞浓度有所贡献；土壤和大气汞浓度未达到污染水平：兰州市黄河水体中汞浓度绝大部分超过《地面水环境质量标准》的Ⅲ类标准值。     

黄河沉积物对Cd~(2+)的吸附及其形态转化影响的实验研究

采用现场采样及室内分析方法,研究了黄河沉积物对Cd2+的吸附及吸附作用对Cd形态转化的影响。结果表明,Cd2+的吸附等温线属于Langmuir型,Cd2+的吸附强烈地依赖于pH值,离子强度的升高、泥沙浓度的增加以及温度的降低均不利于Cd2+吸附;Cd2+被黄河沉积物吸附后主要转入可交换态和碳酸盐结合态,决定了由Cd造成的污染不易消除。     

The amount of recycled crust in sources of mantle-derived melts

Plate tectonic processes introduce basaltic crust (as eclogite) into the peridotitic mantle. The proportions of these two sources in mantle melts are poorly understood. Silica-rich melts formed from eclogite react with peridotite, converting it to olivine-free pyroxenite. Partial melts of this hybrid pyroxenite are higher in nickel and silicon but poorer in manganese, calcium, and magnesium than melts of peridotite. Olivine phenocrysts' compositions record these differences and were used to quantify the contributions of pyroxenite-derived melts in mid-ocean ridge basalts (10 to 30%), ocean island and continental basalts (many >60%), and komatiites (20 to 30%). These results imply involvement of 2 to 20% (up to 28%) of recycled crust in mantle melting.     

HPLC法测定人参健脾丸中橙皮苷的含量

目的建立人参健脾丸中橙皮苷的含量测定方法。方法采用高效液相色谱法测定。结果橙皮苷的线性范围为0．35～4．2μg，平均加样回收率为99．98％（n=5），RSD为1．54％（n=5）。结论该方法简便、可靠、准确，可用于该制剂的质量控制。     

葡萄皮天然紫色素的理化性质研究

本文研究了葡萄皮紫色素的可见吸收光谱、光稳定性、热稳定性、耐氧化性、耐糖性及金属离子对色素稳定性的影响。结果表明：葡萄皮紫色素色质优良，有广阔的开发应用前景。