砾石层中适宜选用的钻进方法

本文作者结合工程实践，简单明确的对在不同地区、砾石层中的钻进方法进行了论述。     

向日葵盘及其果胶主要组成的研究

研究结果表明，向日葵盘组成复杂，初步测定出１０多种天然化合物，其果胶含量以海绵状肉质部位最高，锯齿形苞片部位最低。用气相色谱法分别测定了向日葵盘及其果胶中各种糖基的相对含量，发现它们都含有木糖、阿拉伯糖、甘露糖、半乳糖和葡萄糖等，向日葵盘中葡萄糖含量最高果胶中含半乳糖最多。向日葵盘用水预洗得到的水溶性果胶，其酯化度大于５０％，属于高酯果胶，其表观分子量为１７３４００，向日葵盘经一分别用稀无机酸及多     

Upland agriculture,the land frontier and forest decline in the Philippines

Population pressure, expansion of small-scale agriculture and shifting cultivation are commonly cited as the causes of tropical deforestation. A close examination of deforestation and agriculture in the Philippine uplands reveals, however, that the vast majority of agriculturists must be sedentary farmers. In addition, the importance of population pressure as a cause of deforestation in the Philippines cannot be supported by the available evidence. Lastly, the concept of arable land is shown to be of limited value in discussing upland agriculture in the Philippines.     

Flash chromatography on cartridges for the separation of plant extracts: Rules for the selection of chromatographic conditions and comparison with medium pressure liquid chromatography

Empirical rules for the selection of chromatographic conditions on flash chromatography cartridges were developed, with an emphasis on gradient mode. These rules were then tested with separation of extracts from important medicinal plants including Curcuma xanthorrhiza, Piper nigrum and Salvia milthiorrhiza. Sepacore® cartridges enabled a good separation of compounds with a broad range of polarity, as typically found in plant extracts. The chromatographic resolution remained, however, lower than that achieved on classical columns packed with material of smaller particle size. For poorly soluble extracts, solid introduction gave better results than liquid injection.     

荔枝高压苗繁殖技术研究

为提高荔枝高压苗牛根率、成苗率和定植成活率，课题组１９９３至１９９４年在新平县腰街、夏洒白糯格和者新街等地，分别从ＡＢＴ生根粉的应用、母树年龄、母树光照条件和操作技术等方面进行了荔枝高压苗繁殖技术的试验研究。研究结果表明：应用１０００ｐｐｍＡＢＴ１号生根粉处理环剥口能明显缩短压苗的生根时间，提高生根率；进行高压苗繁殖应选用幼龄母树的向阳生枝条和采用效果良好的生根基质，把握好环剥、包扎等操作技术。     

关于现浇箱梁预压方法--水压法的探讨

支架预压是现浇梁施工必须经过的准备工序。介绍了水压法的可行性和简单的操作过程 ,并对水压法和钢筋预压法的成本、工期进行了比较研究     

纵向刨切生产薄木中刀具与产品质量的关系

本文探讨了纵向刨切机生产薄木过程中刀具的材料、形状及刀具与压尺的相对位置等因素对产品质量的影响。     

浅谈工业锅炉给水除氧

阐述了工业锅炉给水除氧的原理,并对常用的热力除氧、真空除氧、解吸除氧等技术进行了分析。     

汽相法马尾松脱脂技术研究

松树是中国主要的人工林树种,其蓄积量最大,分布地域最广。但由于富含树脂,其用途受到很大限制,因此松木脱脂成为扩大其利用价值的重要手段。基于传统的脱脂方法不甚理想的状况,阐述了1种新的脱脂工艺方法,此方法不仅保证脱脂率,而且大大降低了加工成本。     

Trichothecene genotypes of Gibberella zeae from winter wheat fields in the eastern USA

Fusarium head blight (FHB), caused principally by Gibberella zeae (Fusarium graminearum), is a devastating disease of small grains such as wheat and barley worldwide. Grain infected with G. zeae may be contaminated with trichothecene mycotoxins such as deoxynivalenol (DON) and nivalenol (NIV). Strains of G. zeae that produce DON may also produce acetylated derivatives of DON: 3‐acetyl‐DON (3‐ADON) and 15‐acetyl‐DON (15‐ADON). Gradients (clines) of 3‐ADON genotypes in Canada have raised questions about the distribution of G. zeae trichothecene genotypes in wheat fields in the eastern USA. Tri3 and Tri12 genotypes were evaluated in 998 isolates of G. zeae collected from 39 winter wheat fields in New York (NY), Pennsylvania (PA), Maryland (MD), Virginia (VA), Kentucky (KY) and North Carolina (NC). Ninety‐two percent (919/998) of the isolates were 15‐ADON, 7% (69/998) were 3‐ADON, and 1% (10/998) was NIV. A phylogenetic analysis based on portions of three genes (PHO, RED and URA) from 23 isolates revealed two species of Fusarium (F. graminearum sensu stricto and one isolate of F. cerealis (synonym F. crookwellense)). An increasing trend of 3‐ADON genotypes was observed from NC (south) to NY (north). Punctuated episodes of atmospheric transport may favour a higher frequency of 3‐ADON genotypes in the northeastern USA, near Canada, compared with the mid‐Atlantic states. Discoveries of the NIV genotype in NY and NC indicate the need for more intensive sampling in the surrounding regions.