超声波对大白鼠离体血液流变性质的影响

目的：观察超声剂量对血液流变性质的影响。方法：对１０只大鼠心脏穿刺取血；以０Ｗ·ｃｍ＾－２（作为对照组）、０．５Ｗ·ｃｍ＾－２、１．０Ｗ·ｃｍ·＾－２和１．５Ｗ·ｃｍ＾－２超声剂量在２５．０±０．５℃下固定式辐照５ｍｉｎ；在２５．０±０．１℃下用锥板式粘度计等测量全血高切变率表观粘度等９项指标。结果：超声剂量组与对照组比较，全血高切率（２２５ｓ＾－１）表观粘度（Ｐ〈０．０１）、全血低功率（１１．２     

Variability of first flower to ground distance in olive seedlings and its relationship with the length of the juvenile period and the parent genotype

During development, most woody plants that develop from seeds undergo a juvenile phase before transitioning to adulthood. The first flowering indicates the end of the juvenile period and can be used as a marker to discriminate between phases. In this study we analyzed the distance of the first flower from the ground, measured along the trunk and supportive branches, in 385 olive seedlings coming from eight different crosses. We found that for tree canopy base heights of 1.5 and 1.0 m the average distance at which the first flower appeared was 2.41 or 2.07 m, respectively. Moreover, we observed for the first time that the first flower to ground distance was significantly correlated with the juvenile period length and the olive seedling parent genotype. In fact, a particular cultivar demonstrated a consistent influence on the location of the progeny first flower, irrespective of being used as female or male parent. This implies that the first flower to ground distance may not be constant within the olive species.     

锥形量热仪法研究FRW系列阻燃剂的抑烟性能

采用锥形量热仪法,对FRW系列木材阻燃剂产品FRW-C1和FRW-C2的抑烟性能进行了评价。结果发现:FRW-C1和FRW-C2阻燃处理木材的烟比率、比消光面积、CO2质量分数及产生速率,均比未处理木材显著降低;二者均能有效地降低木材燃烧时的烟浓度和烟释放量,而对木材燃烧时的CO释放无显著影响。     

油松球果生命表分析及其虫害球果品质测定

通过球果生命表的组建和分析，明确辽宁兴城油松种子园共有球果害虫６种，其中油松球果瘿蚊（Ｃｅｃｉｄｏｍｙｉａｗｅｎｉ）、松果梢斑螟（Ｄｉｏｒｙｃｔｒｉａｐｒｙｅｒｉ）和松实小卷蛾（Ｒｅｔｉｎｉａｃｒｉｓｔａｔａ）为球果的关键害虫；确定了各种害虫引起的球果损失比例；从雌球花出现到球果采收，有９２．２７％的球果损失，其中昆虫危害占绝大多数．球果种子品质检验表明，受害球果的种子产量显著减少，但发芽率等种子播种品质并不下降     

芽梢斑螟危害马尾松雄球花的初步研究

马尾松(Pinus massoniana Lamb.)是我国分布最广、数量最多的松树,是组成亚热带地区大面积森林的主要针叶树种,也是淮河以南酸性土荒山造林的先锋树种[1-2]。马尾松花粉有良好的医疗和保健价值。汉代《神农本草经》记载松花粉气味甘温无毒,主治心腹寒热邪气,利小便,消淤血,久服轻身益     

油松开花结实规律的研究

油松雌、雄球花在各级侧枝上的分布状况不同,母树开花结实能力变异很大。据此可将其划分为偏雌型、偏雄型、中性型和营养型等四个类型;花期早晚和球花所在方向、部位有关。还研究了球果在各枝轮及各级侧枝上的分布状况。     

非线性二阶常微分方程的正周期解

探讨f既非超线性的也非次线性的非线性二阶常微分方程, 其正ω-周期解的存在性. 其结果拓展了Krasnosel'skii锥映射不动点定理.     

Measurements of Mouldboard Plow Draft: II. Draft-Soil-Crop and Yield-Draft Associations

The primary objective of this investigation was to evaluate some potential causal associations between draft derived from a 3-bottom mouldboard plow during normal fall field operations and soil-crop properties at a field site near Winchester, Ontario, Canada. A secondary objective was to investigate, in a preliminary manner, associations between draft and crop yield (corn, soybean, and wheat). Regression tree analysis indicated that draft variability was best explained by field location, crop type, soil cone penetration resistance in the plow layer, and soil texture in the plow layer. Draft was found to generally increase with cone penetration resistance in the plow layer and soil clay content. Corn yields were negatively associated with draft. The reverse was true for the soybean yields, and a combination of negative and positive draft vs. yield relationships existed for the wheat plots. The overall results indicated that draft data collected during normal field operations can be useful for producers interested in identifying areas in the field where soil strength/compaction might be problematic with regard to crop yields.     

Strategies for the Development of Conotoxins as New Therapeutic Leads

Peptide toxins typically bind to their target ion channels or receptors with high potency and selectivity, making them attractive leads for therapeutic development. In some cases the native peptide as it is found in the venom from which it originates can be used directly, but in many instances it is desirable to truncate and/or stabilize the peptide to improve its therapeutic properties. A complementary strategy is to display the key residues that make up the pharmacophore of the peptide toxin on a non-peptidic scaffold, thereby creating a peptidomimetic. This review exemplifies these approaches with peptide toxins from marine organisms, with a particular focus on conotoxins.     

Subsoil compaction from tractor traffic in an olive (Olea europea L.) grove in Almería,Spain

This study was in an olive (Olea europea L.) grove in the Vélez Blanco District of Almería, Spain, where the soil is a typical Aridisol. The aim was to evaluate subsoil compaction caused by three different tractors currently used in olive groves. Measurements were made of (i) the cone index (CI), (ii) hydraulic conductivity (HC) and (iii) rut depth after passage of a light tractor (LT = 22.50 kN), a heavy tractor (HT = 42.60 kN) and a medium tractor (MT = 33.30 kN). The CI differed for the topsoil (0–200 mm) for each type of tractor after up to five passes. In this depth soil level, the CI was greatest for LT because the ground pressure (by narrow tyres) was greater than under the MT and HT. For deeper layers, there was a strong positive relationship between number of tractor passes and CI values, and the CI was greater for passes by the HT than the LT or MT. The HT resulted in shallower ruts up to the fifth pass, and the CI values were smaller because there was less ground pressure from this tractor than the others. In all treatments, tractor traffic caused varying decreases in HC in the 0–600 mm depth range. The main conclusion is that subsoil compaction is related directly to tractor weight. For the three tractors, topsoil compaction is caused by ground pressure and not on total axle load.