淀粉颗粒糊化新工艺初探

正交试验结果表明，淀粉与溶剂（乙醇：水＝７：３）按１：５的比例混合，调整ｐＨ值至８．０，在８０℃左右糊化４ｈ，经冷却、过滤、乙醇脱水，最后于６０℃下烘干，产品的α度值、粘度和含水量均基本达到预糊化淀粉的质量标准。     

鱼藤酮及其混剂对蔬菜害虫的毒效研究

用杀虫剂联合作用方法优选山鱼藤酮混氰戊菊酯（４：１）具明显增效作用，对５龄菜粉蝶幼虫共毒系数为３４２．２（触杀），４４９．８（胃毒），对菜蚜ＬＣ５０１．２３ｍｇ／Ｌ。该混剂对菜粉蝶幼虫有明显拒食和抑制生长发育作用，ＡＦＣ５０为０．７ｍｇ／Ｌ；用１８ｍｇ／Ｌ混剂处理幼虫，发育抑制率为８４．４％，田间试验表明，鱼藤混剂对多种害虫有高效，３０ｍｇ／Ｌ的混剂的对菜粉蝶幼虫的防效相当于５０ｍｇ／Ｌ的氰戊菊酯     

樱桃果实贮藏研究

对樱桃(Prunus pseudocerasus)果实贮藏处理表明,简易自发气调(MA)冷藏35天,好果率为74.27%～94.61%,且无霉烂、褐变、软化和保持果实新鲜度。其最佳贮藏期为28天.其中,SP 膜剂+薄膜包装处理效果最佳。此外,还对樱桃贮藏期间营养成分的变化和 POD、CAT、电导率等生理指标作了相关性测定.     

Greenhouse Effects due to Man-Mad Perturbations of Trace Gases

Nitrous oxide, methane, ammonia, and a number of other trace constituents in the earth's atmosphere have infrared absorption bands in the spectral region 7 to 14 microm and contribute to the atmospheric greenhouse effect. The concentrations of these trace gases may undergo substantial changes because of man's activities. Extensive use of chemical fertilizers and combustion of fossil fuels may perturb the nitrogen cycle, leading to increases in atmospheric N(2)O, and the same perturbing processes may increase the amounts of atmospheric CH(4) and NH(3). We use a one-dimensional radiative-convective model for the atmospheric thermal structure to compute the change in the surface temperature of the earth for large assumed increases in the trace gas concentrations; doubling the N(2)O, CH(4), and NH(3) concentrations is found to cause additive increases in the surface temperature of 0.7 degrees , 0.3 degrees , and 0.1 degrees K, respectively. These systematic effects on the earth's radiation budget would have substantial climatic significance. It is therefore important that the abundances of these trace gases be accurately monitored to determine the actual trends of their concentrations.     

国内外红掌研究与进展情况初探

本文对国内外红掌生产与销售的情况进行了对比分析,重点阐述了我国红掌产业中存在的问题,同时对红掌栽培技术进行了系统的介绍,为推动我国红掌产业化发展提供技术支持。     

不同砧木嫁接对西瓜抗病性及主要经济性状的影响

将引进的日本强势葫芦、勇士野生西瓜等7个西瓜嫁接砧木分别与本地主栽的西瓜品种早佳84-24进行嫁接试验。通过对嫁接亲和力,嫁接苗的抗枯萎病能力、产量和品质等主要性状的考查分析,结果表明以日本强势葫芦作砧木的嫁接苗综合性状表现最佳。     

塔里木河中下游地区土壤有机质空间变异性研究

本文以新疆生产建设兵团农二师33团为研究区．根据植被的变化选取土壤样点，运用地统计学方法对土壤有机质的空间变异性进行定量分析，结果表明：土壤有机质含量呈正态分布，空间变异范围是0—1660m，变异函数的最优模型为球状模型。     

Essential role of Fkbp6 in male fertility and homologous chromosome pairing in meiosis

Meiosis is a critical stage of gametogenesis in which alignment and synapsis of chromosomal pairs occur, allowing for the recombination of maternal and paternal genomes. Here we show that FK506 binding protein (Fkbp6) localizes to meiotic chromosome cores and regions of homologous chromosome synapsis. Targeted inactivation of Fkbp6 in mice results in aspermic males and the absence of normal pachytene spermatocytes. Moreover, we identified the deletion of Fkbp6 exon 8 as the causative mutation in spontaneously male sterile as/as mutant rats. Loss of Fkbp6 results in abnormal pairing and misalignments between homologous chromosomes, nonhomologous partner switches, and autosynapsis of X chromosome cores in meiotic spermatocytes. Fertility and meiosis are normal in Fkbp6 mutant females. Thus, Fkbp6 is a component of the synaptonemal complex essential for sex-specific fertility and for the fidelity of homologous chromosome pairing in meiosis.     

裸小鼠繁殖群自发性肿瘤发病情况的研究

对本室六年中饲养于SPF条件下的466只NC系裸鼠繁殖群动物的自发性肿瘤发病情况进行了观察研究,其中纯合子鼠(雄nu/nu)164只,杂合子鼠(雌,un/+)302只。每只动物平均观察时间均达7个月以上,淘汰时均经详细解剖学检查,检出病变者进行病理组织学及透射电镜观察确诊。多数肿瘤病例结合裸鼠间可移植性鉴定.共检出自发性肿瘤7例,发生于纯合子裸鼠5例,杂合子鼠2例。结果表明,在相同饲养环境下,裸鼠(雄,nu/nu)的自发性肿瘤发病率(3.04％)比其同系有胸腺杂合子鼠(雌,nu/+)(0.66％)明显增高(P<0.05),且前者的平均发瘤鼠龄比后者为短,其自发瘤以恶性上皮性肿瘤为主。结果支持了免疫功能缺陷的裸鼠比其同系免疫功能正常鼠有更高的自发性肿瘤的观点。作者还提出了评价裸鼠群体自发性肿瘤发病率的方法.     

From a single-band metal to a high-temperature superconductor via two thermal phase transitions

The nature of the pseudogap phase of cuprate high-temperature superconductors is a major unsolved problem in condensed matter physics. We studied the commencement of the pseudogap state at temperature T* using three different techniques (angle-resolved photoemission spectroscopy, polar Kerr effect, and time-resolved reflectivity) on the same optimally doped Bi2201 crystals. We observed the coincident, abrupt onset at T* of a particle-hole asymmetric antinodal gap in the electronic spectrum, a Kerr rotation in the reflected light polarization, and a change in the ultrafast relaxational dynamics, consistent with a phase transition. Upon further cooling, spectroscopic signatures of superconductivity begin to grow close to the superconducting transition temperature (T(c)), entangled in an energy-momentum-dependent manner with the preexisting pseudogap features, ushering in a ground state with coexisting orders.