稻茬免（少）耕小麦田除草技术试验研究

1995～1996年在稻茬免耕小麦田,进行了播前和播后药剂除草试验.结果表明,播前用41%草甘膦75ml/667m~2或20%百草枯100ml/667m~2防除杂草效果分别为96、94.1%.播后4天用10%甲黄隆4g/667m~2、10%甲黄隆4g/667m~2+25%异丙隆100g/667m~2.对总草株防效分别61.4、80.3%,明显优于50%丁草胺100ml/667m~2防效(44.2%).而在小麦苗2叶1心期用10%甲黄隆4g/667m~2、10%甲黄隆4g/667m~2+25%异丙隆100g/667m~2、10%甲·绿5g/667m~2、25%异丙隆250g/667m~2,对总草株防效分别达82.6、97.3、90.0、88.3%.且比播后土壤处理防效好,并对小麦较安全.示范推广应用中,将播前和播后药剂除草技术相结合,可有效控制稻茬免(少)耕小麦田草害.     

纳米SiO2填充LLDPE复合材料耐热性的研究

采用DSC方法研究了纳米二氧化硅(SiO2)填充线性低密度聚乙烯(LLDPE)的熔融特性。结果表明：填充LLDPE的高温熔融峰峰值温度Tm2变化不大，低温熔融峰温Tml则随着纳米SiO2用量的增加明显向低温偏移，显示出纳米粒子的异相成核作用；在纳米SiO2用量相同的情况下，与表面未处理SiO2及经表面偶联剂处理纳米SiO2填充体系相比较，加有大分子相容剂的体系的Tml和Tm2均有所下降，同时熔融峰宽化；填充LLDPE的热变形温度HDT和软化温度Tg均随纳米SiO2用量的增加而提高；与表面未处理填充体系相比，硅烷偶联剂处理纳米SiO2填充体系的HDT有所上升，加有大分子相容剂的体系的HDT上升则更为明显。     

Polyamide 66 nanocomposites based on organoclays treated with thermally stable phosphonium salts

Purification of bentonite clays and their modification with two thermally stable (alkyl and aryl) phosphonium organic salts were investigated. The organoclays were subsequently melt compounded with Polyamide 66 (PA66), with and without the use of an elastomeric compatibilizer. The morphology, melt flow, thermal stability, and mechanical properties of the binary and ternary nanocomposites were studied. The bentonite clay was purified by sedimentation, resulting in higher cation exchange capacity and thermal stability in comparison with unpurified clay. These were then used in the synthesis of two thermally stable organoclays by replacing the interlayer sodium cations with two (alkyl and aryl) phosphonium surfactant cations to circumvent the problem of low temperature decomposition of quaternary ammonium organoclays usually used in polymer nanocomposites. The organoclay with aliphatic groups showed more compatibility with PA66 in comparison with the organoclay with aromatic groups. Thus, the use of organoclay with aliphatic groups resulted in nanocomposites with higher tensile strength, higher modulus, higher elongation at break, and higher impact strength in comparison with the nanocomposites produced from the organoclay with aromatic groups. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Intimin及其受体Tir在致病性大肠杆菌致细胞线粒体功能障碍中的作用

目的探讨致病性大肠杆菌(Enteropathogenic Escherichia coli,EPEC)外膜蛋白Intimin及其受体Tir在EPEC致HeLa细胞线粒体功能障碍中的作用。方法将EPEC外膜蛋白Intimin及其受体Tir删除株、相应质粒互补株或染色体互补株感染HeLa细胞,用线粒体膜电位(Mitochondria membrane potential,MMP)检测试剂JC-1染色细胞线粒体,通过多功能酶标仪检测MMP水平,Western blot检测Intimin的表达及Tir的转位。结果与野生型菌株相比,Eae删除株和Tir删除株感染细胞的MMP功能显著减弱(P<0.05),Eae删除株功能能被质粒表达相应蛋白所互补,Tir删除株不能被质粒表达Tir互补,但可被染色质表达野生型Tir或TirY474S互补,而染色质TirS434A突变株不能引起明显的MMP下降。结论 Intimin和Tir是参与线粒体功能障碍的重要分子;TirS434在线粒体功能障碍中起重要作用。     

三七叶甙制备原人参二醇及其差向异构体

三七叶总甙以c(NaOH)=2mol/L的氢氧化钠水溶液溶解,沸水浴加热8h进行水解,所得产物经乙酸乙酯萃取和硅胶柱层析分离得到原人参二醇。三七叶总甙与浓盐酸常温反应7h后,再用饱和碳酸钠溶液常温搅拌24h,所得产物经乙酸乙酯萃取和硅胶柱层析分离得到20(R) 原人参二醇。它们的结构经光谱分析及与文献对照得以鉴定。     

白炭黑补强溴化丁基橡胶的性能及特点

研究了白炭黑补强溴化丁基橡胶（BIIR）的性能及特点。结果表明；与炭黑补强相比，白炭黑补强的BIIR表现出了良好的工艺性能、力学性能和热老化性能；硅烷偶联剂（Si69）用置对硫化胶的力学性能有很大的影响；同时还发现白炭黑补强BIIR的拉伸应力软化效应和应力松驰性能与炭黑补强BIIR有着明显的区别。     

Electromechanical behavior of hybrid carbon/glass fiber composites with tension and bending

To understand the smart (i.e., good memory) characteristics of hybrid composites of carbon fibers (CFs) and glass fibers (GFs) with epoxy resin as a matrix, the changes in the electrical resistance of composites with tension and on bending were investigated. The electrical resistance behavior of composites under tension changed with the composition of the CF/GF, as well as with the applied strain. The fractional electrical resistance increased slowly with increasing strain within a relatively low strain region. However, with further loading it increased stepwise with the strain according to the fracture of the CF layers. The strain sensitivity of the samples increased with increasing CF weight percentage, and the samples incorporating more than 40 wt % CF showed a strain sensitivity higher than 1.54 for a single CF. The changes in the fractional electrical resistance with bending were not so dominant as those with tension. This difference was attributed to the action of two cancelling effects, which are the increasing and decreasing fractional electrical resistance due to tension and compression with bending, respectively. On recovery from a large applied bending, the fractional electrical resistance decreased slowly with unloading because of the increase of contacts between the fibers that resulted from the reorganization of ruptured CFs during the recovery. Even the composites incorporating a relatively small CF content showed an irreversible electrical resistance with both tension and bending. However, the strain sensitivity being larger with tension than with bending is ascribed to the difference in their mechanical behaviors. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2447–2453, 2002     

急性冠状动脉综合征患者血清中基质金属蛋白酶-2的表达

目的探讨急性冠状动脉综合征与血清基质金属蛋白酶-2(MMP-2)的相关性。方法应用酶图(SDS-PAGE en-zymograph)和Western blot方法检测50名急性冠脉综合征患者(27名ST段抬高急性心肌梗塞患者和23名不稳定性心绞痛患者)、20名稳定性心绞痛患者及40名正常对照者的血清MMP-2水平。结果急性心肌梗塞组血清MMP-2水平明显高于不稳定性心绞痛组;急性心肌梗塞组及不稳定性心绞痛组血清MMP-2水平明显高于正常对照组;稳定性心绞痛组与正常对照组差异无显著意义;急性心肌梗塞组及不稳定性心绞痛组血清MMP-2水平高于稳定性心绞痛组。结论急性冠脉综合征患者血清MMP-2水平明显升高,其水平可能与冠状动脉斑块的稳定性相关。     

玻璃纤维增强酚醛摩阻材料

针对玻璃纤维增强酚醛摩阻材料存在的问题，研究分析了不同类型玻纤维增强酚醛树脂、玻纤增强橡胶改性酚醛树脂、下纤增强三聚氰胺腰果壳油改性酚醛树以及混杂纤维增强酚醛树脂摩阻材料的性能，并对摩阻复合材料的发展提出建议。     

产纤维素酶细菌的筛选及其紫外诱变

采用刚果红脱色圈法初筛得到143株有纤维素酶活性的细菌。然后采用DNS法复筛得到纤维素酶酶活最高的6株细菌,进一步进行紫外诱变处理,获得酶活提高最大且具有遗传稳定性的菌株E140’,酶活为0．90IU·mL^-1,较出发菌株（0．68IU·mL^-1）提高了32．35％。表明采用刚果红脱色圈法和DNS法联合筛选并结合紫外诱变。可以获得纤维素酶活性高的细菌。     

Effects of Fat Content and Solid Fat Content on Caramel Texture Attributes

Fat plays an important role in caramel quality attributes, yet there is very little published work on how fat type and level influence caramel characteristics. Fat content was increased from 0 to 20 % to determine the effects of total fat content on caramel texture attributes such as cold flow, hardness, stickiness and tensile strength. Solid fat content (SFC) was also varied, from 3 to 90 %, by using commercially‐available fats with varied SFC at 22 °C. Cold flow decreased significantly with increased fat content, with greater effect for fats with higher SFC. Changes in caramel hardness with fat content were dependent on SFC. Hardness generally decreased with increasing fat content for the fats with low SFC, with the 3 % SFC fat softening the most. Hardness increased slightly with fat content for the hardest fat (90 % SFC). Stickiness generally decreased with increasing fat content although the effect was significantly higher with higher SFC fats. These results document that both fat content and SFC significantly influence caramel texture attributes.     

高底物浓度纤维乙醇同步糖化发酵工艺的比较

引言日益加剧的能源危机和环境污染,正迫使人们寻求新的可再生替代能源。纤维乙醇作为一种重要的生物质替代能源,经过近40多年的发展,已经具备了实现工业化生产的潜力。为了进一步降低纤     

Specific determination of malonaldehyde by N-methyl-2-phenylindole or thiobarbituric acid

Reactivity of a commercially available test kit (LPO-586), based on N-methyl-2-phenylindole, toward aldehydes was characterized and compared with that of thiobarbituric acid (TBA). In hydrochloric acid, LPO-586 produced a violet pigment with malonaldehyde (MA) but not with other tested aldehydes. In methane sulfonic acid, LPO-586 produced the violet pigment with MA and 4-hydroxynonenal (HNE), but not with other tested aldehydes. Pigment formation with MA was not inhibited by other aldehydes, but that with HNE was inhibited by alka-2,4-dienals. TBA produced a red pigment with MA but not with other tested aldehydes in hydrochloric acid or in acetate with ethylenediaminetetraacetic acid (EDTA). Both the LPO-586 test in hydrochloric acid and the TBA test in hydrochloric acid or in acetate with EDTA can be used for specific measurement of MA in oxidized lipid samples.     

凹凸棒土与纳米二氧化硅对高强石膏浆体3D可打印性的影响

本文研究了凹凸棒土(ATP)和纳米二氧化硅(NS)对3D打印用α半水石膏浆体泵送性、流变性、支撑性等可打印性及固化体力学强度的影响。结果表明,掺入ATP后,泵送力维持在(0.57±0.02) kN,浆体剪切应力与剪切应变曲线不随掺量增加而发生明显变化,0 h、4 h打印体坍塌角分别从空白组的24°、32°降至掺量为2.8%(质量分数,下同)时的8°、11°。与ATP相比,打印浆体掺加NS后泵送力明显增加,掺加2.8%NS浆体的泵送力是同掺量ATP浆体的近2倍,浆体剪切初始应力随NS掺量增加而增大。虽然掺加NS使浆体泵送阻力增大,NS较ATP对打印体的支撑性却明显提升,掺加2.8%NS打印体0 h、4 h均无明显坍塌。ATP和NS在1%~2%掺量时浆体均可打印,且固化打印体抗压强度均有所增加,但层间粘结强度均削弱约2/3。     

非环状乙缩醛表面活性剂的合成

非环状乙缩醛表面活性剂是一类可分解的表面活性剂。本文以氯化氢为催化剂，脂肪醇与三聚甲醛醚化得到脂肪基氯甲基醚，再与环氧氯丙烷烷基化后加聚乙二醇缩合得到非环状乙缩醛表面活性剂，并考察了其在纺织印染助剂中的应用。     

Mechanical Properties of Melt-processed Blend of Amorphous Corn Flour Composite Filler and Styrene-Butadiene Rubber

The corn flour composite fillers were prepared by blending corn flour with rubber latex, dried, and cryogenically ground into powders, which were then melt-blended with rubber polymers in an internal mixer to form composites with enhanced mechanical properties. The composites prepared with melt-blending method were compared to those prepared with a freeze-drying method. The composite fillers prepared with styrene-butadiene were compared to those made with carboxylated styrene-butadiene matrix. Dynamic effects showed that the corn flour composite fillers produced composites with good tensile strength, elongation ratio, and toughness at 500 mm/min strain rate. Tear resistance of different composites was also studied.     

23例中药联合胰岛素治疗2型糖尿病的临床疗效分析

目的探讨中药联合胰岛素治疗2型糖尿病(T2DM)减低HbA1c的水平。方法对23例初诊T2DM患者作为联合组,采用中药联合胰岛素强化治疗,20例空腹血糖值相同者(对照组)单纯胰岛素治疗作为对照组,疗程3个月,采用SPSS16.0进行统计分析,比较2组在患病结局、血糖控制、糖化血红蛋白(HbA1c)水平之间的差异。结果治疗前2组空腹血糖和餐后2h血糖水平差异无统计学意义(P>0.05),治疗2周后差异有统计学意义(P<0.05)。治疗前2组HbA1c水平差异无统计学意义(P>0.05),治疗3个月后2组差异有统计学意义(P<0.05)。结论中药胰岛素治疗T2DM相比于单纯胰岛素治疗可获得更好血糖控制。     

不同排列结构的纤维层对捕集PM2.5性能影响的数值模拟

基于离散颗粒模型(Discrete Phase Model,DPM)研究了三种纤维排列结构捕集颗粒物规律.模拟了不同排列结构的纤维层在拦截和惯性碰撞两种捕集机制下捕集颗粒物的性能,考察了颗粒物粒径、入口风速和纤维层填充率对平行排列、单层垂直排列和双层垂直排列纤维层捕集颗粒物性能的影响.结果表明,当颗粒物粒径为0.5～2...     

环保型粘合剂XCB-2在全钢载重子午线轮胎胎体胶中的应用

研究环保型橡胶粘合剂XCB-2在全钢载重子午线轮胎胎体胶中的应用,并与间苯二酚和间苯二酚-甲醛树脂(以下简称间甲树脂)进行对比。结果表明:分别采用粘合剂XCB-2和间苯二酚-80等量替代间甲树脂,采用粘合剂XCB-2的胶料加工安全性最好,采用间甲树脂的胶料次之,采用间苯二酚-80的胶料最差;采用粘合剂XCB-2的胶料硫化速率与采用间甲树脂的胶料相当,均低于采用间苯二酚-80的胶料;采用粘合剂XCB-2的胶料物理性能和与钢丝帘线的粘合性能比采用间甲树脂的胶料略好;采用粘合剂XCB-2的胶料工艺性能良好,成本降低。     

UP/纳米CaCO3复合材料体积收缩性能的研究

研究了纳米CaCO3对不饱和聚酯树脂(UP)体积收缩性能的影响及其作用机理.结果表明,随着纳米CaCO3用量的增加,UP/纳米CaCO3复合材料的体积收缩率先下降后上升;用不同偶联剂对填料进行表面处理后,复合材料的体积收缩率较未用偶联剂处理的复合材料低,且用偶联剂硬脂酸处理填料比用偶联剂KH-570更有利于复合材料体积...