一个生成两个相关随机比特串的方法

给出了一个方案,可以将量子密钥分配协议BB84的效率提高近17%.在这个方案中,通信的双方共享一个概率串,其元素都是从区间(0,1)中随机均匀地选取的.在传送和接收一个量子比特的过程中,概率串的相应元素被双方作为各自从两个基中选择一个基的概率,之后利用一个细化的数据分析方案进行随后的数据分析.     

MN品系皮燕麦对E型麦二叉蚜的抗性评价

为了明确MN品系皮燕麦对甘肃流行E型麦二叉蚜的抗性,筛选优异的抗蚜种质资源,在田间3年成株期自然感染蚜量比值法表型抗性鉴定基础上,采用室内苗期人工接蚜、实验种群生命表法测定了12个MN品系皮燕麦对E型麦二叉蚜的抗生性。结果表明,E型麦二叉蚜成蚜在表型中抗品系MN10253上的成蚜寿命和总产蚜量显著低于表型中抗品系MN08243、低抗品系MN09103和中感品系MN09255,产蚜前期显著长于MN08243、MN09103和MN09255;在MN10253上的平均发育历期短于MN08243;在MN10253上的种群趋势指数显著低于MN08243、MN09103和MN09255;在MN10253和MN08243上的内禀增长率rm、周线增长率λ和净增值率R0显著低于MN09255,有翅蚜率显著高于MN09255。说明表型中抗品系MN10253对E型麦二叉蚜种群繁殖具有抑制作用。     

黄芪根瘤象取食胁迫对黄芪3种防御酶活性的影响

为明确黄芪根瘤象取食胁迫对黄芪叶片主要防御酶活性的影响及对黄芪药效物质的可能影响,以黄芪根瘤象及其寄主膜荚黄芪为试验材料,测定了不同取食诱导时间的苯丙氨酸解氨酶(PAL)、过氧化物酶(POD)和多酚氧化酶(PPO)活性变化.结果表明,取食24、48、72 h后,叶片PAL和POD的活性均显著增加;取食24 h后PPO活...     

美洲斑潜蝇发生动态及药剂防治

旨在明确美洲斑潜蝇在陕西省的发生危害特点,了解其对不同杀虫剂种类的敏感性和田间防治效果,为美洲斑潜蝇的有效控制提供依据。2016年对陕西省杨凌地区美洲斑潜蝇寄主植物番茄和黄瓜的受害情况进行调查,并通过室内和田间试验,研究7种杀虫剂对美洲斑潜蝇幼虫的毒力和防效。结果表明,4月份前番茄和黄瓜上美洲斑潜蝇发生较轻,随后逐渐加重,7-9月为危害高峰,10月后危害减轻;全年黄瓜受害重于番茄。在供试的7种药剂中,50%灭蝇胺WP、31%阿维·灭蝇胺SC和2.8%阿维·高氯EC不仅毒力较高,LC50分别为5.41mg/L、1.42mg/L和2.87mg/L,而且持效期长,药后7～10d防效仍超过81%,应用效果较好,建议作为首选药剂在生产上推广应用。     

河西地区玉米田棉铃虫发生规律及其化学防治技术

近年来,棉铃虫在甘肃省河西地区重度发生,严重阻碍了玉米生产。为有效防治棉铃虫,保障玉米生产安全,本研究调查了玉米田棉铃虫发生规律,介绍了两种高效施药器械的应用,并测定了两种生物农药的田间防治效果。结果表明:棉铃虫在河西地区1年可发生3代。越冬蛹主要分布在0~5cm土层中,占总越冬蛹量的55.56%,2016年玉米连作田平均蛹量200.10头/667m2。越冬蛹于4月下旬开始羽化,羽化高峰为5月中下旬,1代棉铃虫羽化高峰为7月下旬,2代棉铃虫羽化高峰为8月中旬。棉铃虫成虫在玉米不同生育期的产卵习性不同,玉米雌穗吐丝后87.86%的卵着落在花丝上。29℃下,棉铃虫卵期4.53d,幼虫平均历期24.60d,蛹期9.93d,成虫寿命为10.07d,完成一个世代需49.13d。田间防治效果显示,高架喷雾防治效果优于无人机喷雾。甲氨基阿维菌素苯甲酸盐防治效果较Bt高,且速效性好。综上所述,河西地区棉铃虫越冬基数大,以2代棉铃虫为害最重,玉米吐丝期为防治的关键时期,喷雾防治时可优先选用高架喷雾方式。     

黔西北地区光皮桦次生林主要群落类型初步研究

按照典型抽样方法,调查了贵州西北部地区28个光皮桦天然次生林样地,根据样地乔木、灌木树种优势种、亚优势种的构成情况进行群落的初步分类。结果表明,该地区光皮桦次生林主要有光皮桦纯林、川榛-光皮桦林、光皮桦响叶杨混交林、光皮桦杉木混交林和光皮桦马尾松混交林5种类型。各类型林分光皮桦的密度较大,树高和胸径生长多处于中等至偏低水平,蓄积量生长则处于偏低至很低水平,绝大多数达不到用材林的生长指标和经济价值。现有光皮桦天然次生林的保护和利用目标,宜以水土保持林为主。如要培育生产力水平较高、经济价值较大的光皮桦用材林,应当选择立地条件较好的造林地,采用人工植苗造林的方式。     

饲用甘蔗在贵州南部的引种试验

通过对3个饲用甘蔗的引种比较试验表明:热选10号鲜草产量最高(为61 750kg/hm~2),每次刈割后再生速度最快(平均3.25cm/d),分蘖能力最强(平均单株分蘖数60个),粗蛋白质和粗脂肪含量最高(分别是9.87％和3.67％),是饲喂牛、羊、马的优质高产饲料,值得在贵州南部推广种植。     

糠醇邻苯二甲酸单酯的合成

以糠醇和邻苯二甲酸酐为原料，通过控制酯化反应条件，制备了糠醇邻苯二甲酸单酯。有关该化合物的合成及相关数据未见文献报道。     

The Combination of Rhizopus chinensis Lipase and Transglutaminase Affects the Rheology and Glutenin Macropolymer Properties of Frozen Dough

The combination of Rhizopus chinensis lipase (RCL) and transglutaminase (TG) was previously reported to improve the quality of frozen dough bread. In this study, the effects of RCL, TG, and their combination on the modification of glutenin macropolymer (GMP) and rheological properties of dough during frozen storage were investigated. Frozen storage changed both GMP and rheology properties of dough. TG treatment significantly decreased the ratio of high‐molecular‐weight glutenin subunits to low‐molecular‐weight glutenin subunits and GMP content in fresh dough, and GMP particle size increased. The effect of RCL on GMP properties was not significant, but its combination with TG dramatically increased the proportion of the larger particles and weighted average volume (D_4.3) in GMP. The treatment with the enzyme combination could have inhibited the depolymerization of GMP, which slowed down the decrease rate of some parameters such as GMP content, proportion of larger particles, D_4.3, and release of free amino and thiol groups during frozen storage. The modification of GMP properties by enzyme treatment weakened the effect of the freezing process on rheological properties of dough, especially TG treatment and its combination with RCL. Correlation between GMP particle size and dough properties (dough tensile force and elastic modulus) after freezing and enzyme treatment were confirmed.     

我国部分区域链格孢属rDNA ITS区序列分析(英文)

[Objective] The study aimed to identify Alternaria Nees. from some areas of China at molecular level by analyzing the rDNA ITS sequence.[Method] The DNA sequences coding for the 5.8S rDNA and the flanking internal transcribed spacers (ITS1 and ITS2) were amplified by PCR with universal primers ITS4 and ITS5 and subsequently sequenced for 34 Alternaria isolates from different areas of China.[Result] Sequences analysis showed that 5.8S rDNA was 159 bp and no variation in tested 34 isolates. There had variables sites in ITS. The isolates that had same sequences as A.tenuissima or A.alternata all put up eurytopicity to area and host. The variables sites of the isolates showed the diversity of Alternaria in the hosts of Oleaceae, Rosaceae and Solanaceae. At the same time that ITS could not clearly separated the isolates was indicated. The results indicated that the phylogenetic relationship were not closely related to the geographical origin and hosts of these isolates.[Conclusion] The sequence analysis of ITS region could provide theory basis for the identification of Alternaria Nees..