辽河油田欧52井火山岩油层三元酸压裂酸化工艺技术

辽河油田东部凹陷火山岩油藏较为集中分布．然而常规酸化效果较差．经采用三元酸（粉末硝酸、盐酸和氢氟酸）前置液压裂酸化后．获得显著的增产效果，进一步表明该项酸化工艺技术成熟，宜于推广应用。同时也面临技术集成再创新机遇．适应更广泛的地质需求。     

浅谈气泡混合轻质土的特点及应用

结合高速公路的发展,分析了气泡混合轻质土的设计机理,详细地介绍了气泡混合轻质土的工程特性,阐述了气泡混合轻质土在公路建设中的应用,最后对气泡混合轻质土的应用前景进行了展望。     

INHIBITION OF BEER-SPOILAGE LACTIC ACID BACTERIA BY NISIN

149 strains of bacteria, mostly brewery contaminants able to spoil wort or beer, and 12 brewing strains of yeast (8 ale and 4 lager strains) have been screened using a well-test assay for sensitivity to the food preservative, Nisin (E234), Nisin inhibited growth of 92% of the gram-positive strains, predominantly lactic acid bacteria of the genera Lactobacillus and Pediococcus. In contrast, all 32 gram-negative strains tested, except 3 Flavobacter strains, were Nisin-resistant; in addition none of the brewing yeasts showed Nisin-sensitivity. Therefore. Nisin has potential applications in preventing spoilage of worts or beers by lactic acid bacteria.     

对硝基苯偶氮2-羟基萘-3-甲酰烷基胺系聚丙烯纤维用红色染料的合成及应用

本文将2,3-酸在甲苯溶剂中用氯化亚砜酰氯化合成2-羟基萘-3-甲酰氯,将其分别和正丁胺、正辛胺、正十二胺和正十八胺反应制得4种不同碳链长度的2-羟基萘-3-甲酰烷基胺,用对硝基苯胺重氮盐与其偶合分别制得了对硝基苯偶氮2-羟基萘-3-甲酰正丁胺、对硝基苯偶氮2-羟基萘-3-甲酰正辛胺、对硝基苯偶氮2-羟基萘-3-甲酰正十二胺和对硝基苯偶氮2-羟基萘-3-甲酰正十八胺系聚丙烯纤维用红色染料。熔点分别为189.8℃、96.2℃、115.8℃和108.1℃;热分解点分别为273.1℃、216.0℃、258.0℃和221.0℃;最大吸收波长分别为515.8nm、516.8nm、513.6nm和514.2nm。在染色条件下,4支染料在聚丙烯纤维上的上染率分别37.6％、41.8％、42.4％和44.7％。     

Allelopathic effects of giant foxtail on germination and radicle elongation of loblolly pine seed

Water extracts of giant foxtail grass inhibited germination and radicle elongation of loblolly pine seed in a laboratory test. Most of the toxic effects came from extracts of dried foxtail tops, with lesser amounts from fresh tops and roots. Soil texture affected the phytotoxicity of the extracts. Eight chemical compounds known to be phytotoxins inSetaria were identified in extracts of foxtail leaves but could not be found in soil samples under the leaves.     

软土中的基坑支护工程实例分析

武汉某地下车库基坑处于深厚淤泥中 ,采用排桩 +土层锚杆支护与放坡 +网喷分段支护方式 ,本文根据现场地质、地形条件 ,对本工程支护过程中支护桩与土体变形作了具体分析。     

Facile optical resolution of amino acid esters via hydrolysis by an industrial enzyme in organic solvents

Racemic amino acid esters were optically resolved via hydrolysis in organic solvents by the catalysis of an industrial alkaline protease, “Alcalase”. The products which were composed mainly of L-amino acids were insoluble and easily separated by filtration. The activity of the enzyme and enantiomeric excess of the products were significantly dependent on the nature of solvent and the water content in the reaction media. Generally, high values of enantiomeric excess were obtained at low water contents. Many natural and unnatural amino acids were resolved by this method.     

Preparation of fatty acid methyl esters for gas-chromatographic analysis of lipids in biological materials

Theoretically, preparation of fatty acid methyl esters (FAMEs) deals with reversible chemical reactions in a complex system. Methodologically, there are numerous ways, generally characterized by the type of catalysts used and steps involved. Although there are more than a half dozen common catalysts, the majority fall into either acidic (HCl, H₂SO₄ and BF₃) or alkaline types (NaOCH₃, KOH and NaOH), with each having its own catalytic capability and application limitations. In terms of steps, many conventional methods, including those officially recognized, consist of drying, digestion, extraction, purification, alkaline hydrolysis, transmethylation/methylation and postreaction work-up. Although these methods are capable of providing reliable estimates if some precautions are taken, they are cumbersome, time-consuming and cost-inefficient. A new approach has been to transmethylate lipidsin situ. Due to its simplicity, high sensitivity, comparable reliability and capability to determine total fatty acids, the method of direct transmethylation is finding a unique place in lipid determination. Regardless of which method is used, quantitative methylation requires chemists to take precautions at every step involved, particularly during FAME formation and subsequent recovery steps. Evidently, there is an urgent need for more systematic studies, guided by the chemical principle of reactions involved and physicochemical properties of regents and end products, into factors affecting these steps. Hopefully, this will lead to an improved method, which measures lipid composition in biological materials not only with high accuracy but also with high efficiency and minimum costs.     

过一硫酸的合成及其在铀水冶中的应用

文章介绍了选择过一硫酸合成的最佳条件及进行生产的可行性。介绍了过一硫酸用于含铀煌斑岩、辉绿岩、花岗岩及炭板岩矿石提取铀时,与常规酸浸方法对比,有很好的经济效益和对环境的保护价值。