河西绒山羊的生产性能分析与发展策略

阐述了河西绒山羊不同生产区育种核心群和生产群的各项生产性能,并对各生产性能进行了分析,指出了存在的问题及解决的方法。河西绒山羊作为一个原始古老的品种,应加大该品种的选育幅度,进一步提高其生产性能,保护好该品种的遗传资源。     

对玉米品种区域试验和生产应用中的几点思考

国家或省级区试是品种进入市场的通行证。但品种区域试验也有其不足之处：干扰了试验的准确度,影响了品种审定的公正性并减小对生产的保证系数,影响了品种的推广力度。而引进国外的品种登记制度是改进目前这一现象的可行方法,同时应该加强品种在生产应用上的管理。     

马铃薯特色品种生产试验研究与品种评价

本试验对外引的3个特色马铃薯品种进行了大田生产试验研究,通过生产试验对其产量、农艺性状、效益等进行了综合评价,筛选出了天籽1号、黑金刚2个特色品种可在生产上应用推广.     

玉米品种密度对比试验

选用耐密高产的抗倒品种且合理密植是玉米生产的主攻方向。大量的栽培试验表明,针对品种特性及生产条件合理增加种植密度有助于提高单产。近几年,郑单958、KWS2564等耐密品种在玉米生产中发挥了重要作用。本试验对不同玉米品种在不同密度条件下的产量及主要农艺性状进行了深入研究,以确定其在生产中的最佳种植密度,使良种良法配套,达到农业增产、农民增收的目的。     

烟草品种在不同海拔生产的农艺性状与环境互作效应分析

用不同海拔产地(曲靖、版纳、昭通、大理)生产的MS云烟85和MS K326种子,通过不同烟区多年试验,经品种农艺性状与环境互作的适应性与稳定性综合分析,结果表明,同一品种在不同海拔产地生产的烟草种子其品种农艺性状表现、适应性与稳定性均无显著差异,而不同品种在不同地点生产的烟草种子其品种农艺性状表现差异显著,品种农艺性状的适应性和稳定性也存在显著差异。     

3个优质冬小麦新品种原种生产技术规程

为了提高冬小麦品种的原种生产水平,确保其品种特性,在试验研究和生产实践的基础上,制定了3个冬小麦良种兰天28号、陇育4号、灵台3号的原种生产技术规程。     

大豆不同品种不同栽培方式对产量的影响

每个大豆品种都有其最佳的栽培方式,文章就2009年对7个品种进行了探讨,研究其在不同栽培条件下产量变化规律,为生产应用提供数据。     

用“四年二圃一田”法提纯复壮小麦品种

小麦新品种的快速发展和种植，促进了粮食生产水平的不断上升。由于其在繁殖、生产过程中存在较高的机械和天然混杂因素，从而降低了品种的正常使用价值。因此，利用提纯复壮方法是保持品种青春活力，延长品种使用寿命，提高品种生产水平的基本方法。[第一段]     

甘蔗生产模型初探——以糖分动态分析为例

通过计算机系统建立甘蔗生产模型从而快速掌握甘蔗的糖分动态,对优化管理甘蔗生产具有现实意义。本文对3个品种、3个播种期的甘蔗植株进行6次锤度取样,并对试验数据进行了统计分析。结果表明,同一品种不同播种期的甘蔗植株,其糖分大体上都是随株龄的增长而升高;而同一播种期不同品种的甘蔗植株,其糖分的变化主要是由品种的遗传性决定的。     

赤峰地区主要菜豆品种特性鉴定及生产试验

文章对赤峰地区目前生产上常用的12个主要菜豆品种进行性状鉴定及生产试验，并根据其试验结果，评估了其在赤峰作为北菜南运品种的利用价值、存在的问题及开发前景。     

穴盘规格和苗龄对塑料大棚菜豆性状及产量的影响

本试验以菜豆品种先行者为试材,采用32孔、50孔两种规格穴盘,设置10、15、20、25 d等4个苗龄段,通过研究不同穴盘规格和苗龄对菜豆性状及产量的影响,筛选出适合菜豆育苗的穴盘规格和适宜的苗龄。结果表明：穴盘育苗的营养面积增大,菜豆产量随之增加,25 d苗龄条件下,32孔穴盘的前期产量和总产量均显著高于50孔穴盘;随着苗龄的增长,菜豆的前期产量和总产量呈增加趋势,其中25 d苗龄的产量显著高于其他苗龄。综合上述各项指标,菜豆育苗阶段,10 d苗龄可选用32孔、50孔穴盘,15 d以上秧苗选用32孔穴盘为宜。     

不同基因型小麦苗期耐低氮性评价及筛选

氮素作为重要的营养元素,限制着小麦的生长发育和经济产量,筛选和培育耐低氮小麦品种是提高氮素利用率、降低生产成本的有效途径。以118份不同基因型小麦为材料,在低氮(0.1 mmol·L^-1)和正常氮(5 mmol·L^-1)条件下苗期水培,测定根干重、茎叶干重、根冠比、植株干重、最大根长、初生根数和二级初生根数等相关指标,采用模糊隶属函数法、主成分分析以及聚类分析法综合评价小麦品种的耐低氮性。结果表明,在低氮胁迫下小麦幼苗的根干重、根冠比和初生根数目显著提高,茎叶干重、植株干重和最大根长不同程度的降低,7个苗期性状指标在两个氮水平下均存在显著性差异。主成分分析提取3个主成分,贡献率分别为 43.575%、22.904%和17.873%,累积贡献率达 84.351%。以耐低氮性综合评价D值进行聚类分析,将118份小麦品种划分为强耐低氮型、耐低氮型、中间型、较敏感型和敏感型5类。筛选出3份耐低氮型小麦（齐大195、金丰7183和天民198）和2份强耐低氮型小麦（山农0917和鲁麦8号）。不同小麦品种的耐低氮机制不同,研究结果为小麦耐低氮品种的选育提供理论依据和材料基础。     

一串红N、P、K、Ca、Mg、Fe缺素症状研究

以‘展望红’为材料,研究N、P、K、Ca、Mg、Fe缺乏对其生长发育的影响,并总结缺素症状,研究结果表明:N缺乏时植株矮小,叶发黄;P缺乏时叶色暗绿,且影响开花;K缺乏时基部叶枯黄,并易落叶;缺Fe症状较为明显,但能正常开花;Ca、Mg未表现出缺素症状,且各项指标要优于全素处理;N、P显著影响一串红的生长发育,K对开花品质的影响较大。     

Segregation of form, color, movement, and depth: anatomy, physiology, and perception

Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties.     

ICP-OES法同时测定果蔬中铅、砷、镉、铬、铜、锡含量

果蔬样品经混酸消化后,控制一定的酸度,定容后应用等离子体发射光谱法(ICP-OES)对果蔬中铅、砷、镉、铬、铜、锡六种有害重金属进行测定,研究了分析测定条件,方法简单快速。测定结果表明,五种元素的加标平均回收率在91.0%~107%之间。其RSD均小于3.5%。按该方法进行处理及测定铅、砷、镉、铬、铜、锡,在选择的测定条件下最低检出限分别为0.0006 mg/kg、0.0003 mg/kg、0.00003 mg/kg、0.00005 mg/kg、0.00003 mg/kg、0.0006 mg/kg。     

Space, stars, c60, and soot

Although carbon has been subjected to far more study than all other elements put together, the buckminsterfullerene hollow-cage structure, recently proposed to account for the exceptional stability of the C(60) cluster, has shed a totally new and revealing light on several important aspects of carbon's chemical and physical properties that were quite unsuspected and others that were not previously well understood. Most significant is the discovery that C(60) appears to form spontaneously, and this has particularly important implications for particle formation in combustion and in space as well as for the chemistry of polyaromatic compounds. The intriguing revelation that 12 pentagonal "defects" convert a planar hexagonal array of any size into a quasi-icosahedral cage explains why some intrinsically planar materials form quasi-crystalline particles, as appears to occur in the case of soot. Although the novel structural proposal has still to be unequivocally confirmed, this article pays particular attention to the way in which it provides convincing explanations of puzzling observations in several fields, so lending credence to the structure proposed for C(60).     

Strategic command, control, communications, and intelligence

Command, control, communications, and intelligence (C(3)l) for nuclear forces are essential elements in the deterrence of nuclear war. The present C(3)l) system has vulnerabilities associated with its reliability, survivability, and endurance under attack, thereby weakening deterrence by increasing the ambiguity in our capabilities. Development of a reliable and enduring C(3)l) system would reduce this ambiguity. Its reliable, positive control of nuclear forces would give the national leadership more time to assess situations, ensure discriminate retaliation, and improve our ability to manage crises in general. These capabilities could help to stop a war rapidly should one start. A reliable and enduring C(3)1) system will be needed for a long time to come, even if a freeze on strategic nuclear forces is accomplished or other arms control successes achieved. Indeed, C(3)l) may be the best source today of confidence-building measures to reduce tensions and the threat of nuclear catastrophe.