SRAP标记在夏华2号甘蓝种子纯度检测中的应用

应用SRAP技术对夏华2号甘蓝种子纯度进行了分子检测研究。结果表明,从100对SRAP引物中筛选出1对引物(Me-5/Em-8)能清晰地扩增出父、母本的特异性条带,并且F1代带型呈双亲互补。利用这对SRAP引物对夏华2号种子进行纯度检测,检测纯度为97%,与田间生物学性状表现相符合,表明SRAP技术可用于夏华2号甘蓝种子纯度鉴定。     

可免钝化涂装的纳米材料复合粉末涂料研制

用SiO2、ZnO、TiO2 3种纳米材料复合改性粉末涂料，显著改进涂膜的附着力和防蚀性，制得的纳米材料复合粉末涂料在铝合金型材上无铬钝化涂装，产品性能完全达到有关国标和行标的要求，某些性能超过对应的传统涂装的产品性能。对涂膜形态、涂膜与铝合金的界面结构用扫描电镜、透射电镜进行了表征。并介绍了该产品在减少六价铬的污染、节约成本上的重大意义及推广前景。     

黄党散超微粉对肉鸡生产性能的影响

选择健康、体重基本一致的1日龄艾维菌白羽肉仔鸡250羽，随机分为5个处理组，即在肉鸡基础日粮中不添加任何添加剂（空白对照）、添加2．0％黄党散普通粉剂（药物处理对照）、添加0．5％黄党散超微粉剂、添加1．0％黄党散超微粉剂和添加1．5％黄党散超微粉剂，探讨黄党散超微粉剂对肉鸡生产性能的影响。结果表明：黄党散对肉鸡的生产性能具有显著影响，且黄党散超微粉优于普通粉；在肉鸡日粮中添加黄党散超微粉剂，能显著提高肉鸡的成活率、平均日增重和饲料利用率。其中添加量为1．0％时效果最好，肉鸡总成活率为94％，饲养第8周时平均日增重为1226．61g，料肉比为1．90。     

水泥粉体喷射搅拌桩在南湖排涝站工程地基处理中的应用

泵站基础处理是泵站工程的关键，对于含水量大、压缩性高、透水性差、灵敏度高、承载力低的软基面处理，水泥粉体喷射搅拌桩在技术经济方面有着明显优势，本文结合南湖排涝站工程地基处理施工实际，探讨水泥粉体喷射搅拌桩（简称水泥粉喷桩）施工工艺及质量控制。     

Stability of Fish Powder Made from Saithe (Pollachius virens) as Measured by Lipid Oxidation and Functional Properties

ABSTRACT

Lipid oxidation and functional properties were monitored in spray dried fish powder made from saithe (Pollachius virens) by-products. The fresh powder exhibited slight antioxidant activity in a model system of linoleic acid emulsion. The freshly made powder had low lipid extract-ability in polar solvents and over 30% free fatty acids (FFA). Further lipid oxidation took place during storage, independent of storage temperatures. Functional properties measured by color changes, water-binding capacity, apparent viscosity and protein solubilty changed more during storage at 30°C than 0°C.     

杨木粉无胶模塑成形工艺参数优化

在成形压力、成形温度、保温保压时间3个单因素试验的基础上,运用响应面分析法,以试件的静曲强度、内结合强度、吸水率等4个性能指标为评价指标,对杨木粉末的高压无胶模塑成形最佳工艺进行了研究,并利用统计学方法建立了试件的静曲强度二次多项数学模型。结果表明,杨木粉末的最佳高压无胶模塑成形工艺条件为:成形压力70 MPa、成形温度160℃、保温保压时间30 min;在最佳工艺条件下,试件材质塑化明显,密度高达1.38 g/cm3,吸水率仅为2.57%,静曲强度、抗拉强度和内结合强度分别达到了50.11、20.77、4.23 MPa。     

选择性激光烧结后处理工艺技术研究现状

针对选择性激光烧结（SLS）在无压以及无支撑条件下对材料进行激光加热烧结获得成型件的致密性较低、强度较差的问题,采用后处理工艺可以提高成型件的各项性能.根据不同原材料烧结机理的不同,介绍SLS原材料及其成型方法,分别论述金属粉末、高分子粉末、陶瓷粉末以及复合粉末烧结成型件的后处理工艺研究现状和方法以及成型件经后处理后的性能变化.重点研究SLS新型原材料木塑复合材料和它的后处理工艺,研究表明通过后处理不仅提高制件力学性能和表面质量,其渗蜡件还可以作为精密铸造消失模.     

77％硫酸铜钙WP防治柑橘溃疡病药效试验

进行77％硫酸铜钙WP防治柑橘溃疡病的药效对比试验，试验结果表明：该药对柑橘溃疡病有较好的防治效果，用400、500倍液防治柑橘溃疡病，第3次药前对果的防效达79．92％-85．65％，对叶的防效达80．74％-86．07％；第3次药后15d对果的防效达80．06％～86．59％，对叶的防效达81．48％～86．87％...     

Effects of Graded Levels of Cadmium on Spinach and Cabbage Grown in an Inceptisol

Cadmium (Cd) contamination of the soil and its concentrations in spinach and cabbage were studied in a pot culture experiment. Eight levels of Cd (0–100 mg kg^?1 soil) were applied singly. Application of Cd of up to 10 and 15 mg kg^?1 resulted in safe Cd concentrations (1.56 and 1.38 mg kg^?1) in the shoots of spinach and cabbage, respectively, at the consumable stage. The total chlorophyll content gradually decreased with the addition of Cd, and the maximum decreases were 31.7 and 32% in spinach and cabbage, respectively, at 60 days of crop growth in the treatment Cd₁₀₀ over the control. The greatest diethylene triamine penta-acetic acid (DTPA)–extractable Cd contents in the postharvest soil of spinach and cabbage were 22.09 and 24.22 mg kg^?1, respectively, in the treatment Cd₁₀₀. The DTPA Cd was significantly negatively correlated with leaf area and total chlorophyll content while positively correlated with root and shoot Cd concentrations of spinach and cabbage.     

Monitoring sap nitrate in vegetable crops: Comparison of test strips with electrode methods,and effects of time of day and leaf position

Abstract

A field crop of 3‐month old cabbages was sampled every 2 h from 0600 h until 2000 h. At each sampling, an upper, middle and lower leaf were taken from four plants, and their petiole nitrate status measured by three methods (a) “Merckoquant”; test strips (b) specific ion electrode on a fresh macerated extract and (c) the same electrode on an extract of oven dry tissue. All three methods led to similar conclusions: a. there were very big differences in concentration with leaf position, the middle leaf having the highest;

b. there were large concentration differences between plants, especially for the lower leaves;

c. the effect of time of day was not significant.

The test strips are capable of giving satisfactory results provided that sufficient plants are sampled, but values thus obtained for sap may be lower than for macerated fresh tissue, especially at the low end of the concentration range.