蜂花粉多糖液抑制肿瘤作用的实验研究

通过对小鼠腋下移植肿瘤S180后给荷瘤小鼠灌胃花粉多糖液,以观察花粉多糖液对肿瘤的抑制作用。将60只荷瘤小鼠随机分为环磷酰胺组(50 mg/kg)、阴性对照组、花粉多糖实验组,实验组连续给小鼠灌胃花粉多糖液10 d。结果表明:800 mg/kg花粉多糖组可明显降低瘤体重量,抑瘤率明显提高,达43.63%,与对照组比较差异显著,并呈剂量-效应关系。同时,吞噬指数与肿瘤对照组比较差异具极显著。结果显示花粉多糖液达到一定浓度时具有抑制肿瘤和提高小鼠腹腔巨噬细胞的吞噬作用。     

玉米杂交种吉单180及其亲本灌浆速率的研究

选用玉米杂交种吉单180及其亲本吉853和Mo17为试验材料,对玉米子粒的灌浆速率进行研究。结果表明:玉米杂交种吉单180及其亲本灌浆速率的极值均出现在授粉后的25d,且与其他时期的灌浆速率有显著的差异;亲本吉853和Mo17在灌浆期末期都有一个小峰值,这是杂交组合吉853×Mo17高产、稳产的重要原因;通过研究证明了塘四平头×Lancaster系统杂交的系统优势,为优良品种的选育提供了方向;并提出了在吉单180高产栽培中,在灌浆期期间的田间管理措施及注意要点。      

无公害技术在防治春尺蠖上的应用

阐述了春尺蠖的危害、发生规律及防治方法。利用糖醋盘 ,灯光诱杀成虫 ,在树干上捆绑草绳 ,喷涂毒环阻止成虫上树产卵及使用无公害生物制剂防治幼虫效果较好     

西伯利亚落叶松树轮稳定碳同位素对气候的响应

利用采自阿尔泰山南坡东段正格采点的西伯利亚落叶松树轮样本,建立树轮宽度年表,对比宽度年表,按照树轮稳定碳同位素研究步骤,提取树轮稳定碳同位素序列（δ¹³C）和去趋势序列（DS）。分析表明：阿尔泰山南坡东部近160 a西伯利亚落叶松树轮δ¹³C变化于-22.8‰～-25.4‰,平均值为-24.0‰,变差系数-0.017。相关分析表明：正格采点树轮宽度序列对各气候要素相关不显著;树轮去趋势序列（DS）对前期气候因子的响应也不敏感;在生长季内（5~9月）,树轮去趋势序列（DS）与富蕴气象站平均气温、平均最高气温和平均相对湿度有较好的相关性,树木生长季内的平均气温、平均最高气温与树轮去趋势序列（DS）显著正相关,6~7月平均最高气温与去趋势序列（DS）相关达到0.611（P<0.000 001);与生长季内平均相对湿度呈负相关关系,其中6~7月相对湿度与去趋势序列（DS）相关最高(r=-0.493, P<0.001),与7月降水量呈负相关关系(r=-0.459, P<0.01)。生长季内的平均最高气温和相对湿度对阿尔泰山西伯利亚落叶松树轮δ¹³C的响应最为敏感,阿尔泰山西伯利亚落叶松树木碳同位素分馏的主要控制因子为6~7月的平均最高气温,降水对树轮稳定碳同位素影响不大,相对湿度对树轮稳定碳同位素没有直接影响。     

Aloe ring spot,a new disease of aloe caused by <Emphasis Type="Italic">Haematonectria haematococca</Emphasis> (Berk. &; Broome) Samuels &; Nirenberg (anamorph: <Emphasis Type="Italic">Fusarium</Emphasis> sp.)

A ring spot disease of Aloe vera was found on leaves of potted seedlings of Aloe vera in Hachijojima and Chichijima Islands, Tokyo. From tissue of ring spot lesions, a fungus producing Fusarium-type conidia was consistently isolated. After 1 month, reddish perithecia of nectriaceous fungus had formed on the colonies of this isolate on PDA. These nectriaceous and Fusarium fungi were identified as Haematonectria haematococca and Fusarium sp., respectively. From a single ascospore isolation, the former was confirmed to be the teleomorph of the Fusarium sp. Typical ring spot lesions were reproduced by artificial inoculations using single ascospore and single conidium isolates. Inoculations of five species of genus Aloe revealed that they were highly susceptible except for A. arborescens. This is the first report of a disease on Aloe caused by H. haematococca (anamorph: Fusarium sp.) in Japan, and it was named aloe ring spot.     

Influence of growth ring angle,adhesive system and viscosity on the shear strength of adhesive bonds

Abstract

To investigate the influence of growth ring angle, adhesive system and viscosity on the bonding properties of adhesive bonds, shear tension tests according to DIN EN 302-1 (2004) were conducted using one-component moisture-curing polyurethane, polyvinylacetate and urea-formaldehyde. Significant differences between the systems could be detected, which were reflected in the predominant failure behaviour for each system. Specimens showing wood failure were influenced mainly by the wood factors, whereas samples which had failed in the adhesive part of the bond differed only in the adhesive properties. The growth ring angle showed the same tendencies as it does in plain wood. Therefore, to gain more information on the adhesive performance in the bond, a loading along the LT plane seems more appropriate for beech wood used in DIN EN 302-1 (2004).     

等效电荷变换法及其在量子环研究中的应用

利用等效电荷变换法,把三维空间中的杂质电荷对位于X-Y平面上量子环的影响,用一个在X-Y平面上（或X轴上）的虚拟等效电荷取代,从而使计算简化,对结果的分析更加清晰,物理图像更加明确.     

Similarities and differences between Amaranthus species and cultivars and estimation of outcrossing rate on the basis of electrophoretic separations of urea-soluble seed proteins

Wheat-rye translocation line (2BS/2RL) has been developed for resistance to biotype L of Hessian fly and agronomically useful traits. AFLP analysis using 64 primer pairs was conducted in order to identify 2RL-specific polymorphisms between “Coker 797” (non-2RL), near-isogenic line (NIL) carrying 2RL, and “Hamlet”. Nine primer combinations identified twelve reproducible polymorphic fragments in the NIL carrying 2RL. These twelve fragments were cloned and sequenced with an aim towards converting AFLP markers into sequence tagged sites (STS). A comparison of the 12 sequences with non-redundant accessions in the NCBI database using the BLAST search option indicated that one fragment of approximately 200 bp in length (amplified using primer combination E+AAC / M+CTA) was highly homologous with the rye-specific repetitive sequence R173-1 and Wis-2-lA, a retrotransposon-like element in wheat. Two STS primers (SJ07 and SJ09) out of twelve STS primer sets enabled the detection of polymorphisms between Coker 797 and NIL carrying 2RL. In order to verify whether the polymorphism detected by primers SJ07 and SJ09 was in fact the result of the presence of 2RL, additional plant material was examined. Amplified products of about 260 bp fragment with the SJ07 primer set were generated in rye cvs.“Chilbohomil” and “Jochunhomil”, triticale experimental line Suwon 15, and wheat experimental line K-14 (1AL/1RS & 2BS/2RL), as well as NIL carrying 2RL and Hamlet, but not in Coker 797 (non-2RL), “Keumgangmil” (non-translocation wheat), KS92WGRC17 (PI592729 /;/ 6BS/6BL-6RL), KS92WGRC19 (P1592731 /;/ 4BS/4BL-6RL), “TAM200” (1AL/1RS), and “Siouxland” (1BL/1RS). Our data suggest that primer set SJ07 amplifies a “2RL-specific” fragment of diagnostic value. This revised version was published online in August 2006 with corrections to the Cover Date.     

ANALYTICAL SOLUTION OF RING SHELL LINING WITH ANNULARLY VERTICAL WALLS MADE CONTACT WITH SURROUNDING ROCK

In this paper,the ring shell lining with annularly verticalwalls made contact with the surrounding rock is considered as a combinationstructure formed of ring shell,inner and outer annular barrels on elastic fo-undation.The complex equation and its solutions of ring shell under deadload of lining and vertical and horizontal surrounding rock pressures are de-rived by the method of complex function.The governing equation and itssolution of the barrels on elastic foundation are also derived by theory ofcylindrical shell.And then,the ring shell lining is assembled by the subst-ructures by means of compatibility conditions of internal forces and defor-mations between them.In the paper,all formulas for the practical computa-tion in engineering are derived,the numerical examples are given and theeffects of the parameters of the lining on the work behaviours of lining alsoare discussed preliminarily     

Assessment of sugar maple tree growth in relation to the partitioning of elements in xylem along a soil acidity gradient

Partitioning of elements in tree xylem is being increasingly studied, as it suggests that elements are potentially mobile within the xylem long after their uptake. A recent study revealed that only the most mobile xylem fraction (water-soluble) of base cations (calcium [Ca], magnesium [Mg], and potassium [K]) increased at higher soil acidity, while the two mobile fractions (water- and acid-soluble) of acidic metals—potentially phytotoxic aluminium (Al), cadmium (Cd) and manganese (Mn)—were significantly enhanced on very acid soils. The current paper presents an investigation of soil-wood chemistry relationships with basal area tree growth. It was hypothesized that the growth of sugar maple would be reduced by low base cation and high acidic metal concentrations in the xylem mobile fractions. Sugar maple trees (n = 55) from six watersheds in southern Quebec, Canada were analysed by sequential chemical extractions for the water-soluble, acid-soluble and residual fractions of base cations (Ca, K, Mg) and acidic metals (Al, Cd, Mn) in xylem. Generally, tree growth was positively correlated to concentrations of base cations in wood (ρ = 0.27-0.50) and soil (ρ = 0.41-0.67), and negatively correlated to concentrations of acidic metals in wood (ρ = −0.33 to −0.52) and soil (ρ = −0.67). However, these relations differed depending on the element fraction considered. Water- and acid-soluble xylem concentrations of base cations and Al were among the best predictors of growth trends (R² = 0.46-0.51). The relationship between acidic metals and tree growth is further discussed.