香菇新品种“豫香1号”的选育

香菇新品种"豫香1号"是从河南省卢氏县伏牛山地区采集的野生香菇菌株经过系统选育而获得的优良品种,子实体多单生,菌盖圆整、浅褐色、较厚,菌柄较短、呈倒圆锥形,产量高,鲜销耐储存,干销品质好,属中温、中熟品种,可采用大棚层架式栽培。     

Research on Step/Iges Conversion Tool of Surface Model AP203-Based

Most CAD systems conform to STEP standard and IGES specification as their input/output interfaces. In this paper,the STEP/IGES conversion tool of surface model based on AP203 is presented. The interface architecture of conversion tool and program language representation of STEP integrated resource construct are discussed in detail,and the mapping of surface structure and the conversion of entity data between STEP and IGES are established. Finally,an applied example is given.     

不同栽培方式下香型优质稻渝香203的产量分析

[目的]研究不同栽培方式下优质稻渝香203的产量差异,探讨挖掘品种的高产潜力的栽培技术。[方法]研究手栽秧、机栽秧、抛秧、直播4种栽培方式下渝香203产量及相关性状的差异。[结果]手栽秧种植方式下产量最高,之后依次为机栽秧、抛秧,直播栽培方式下产量最低。[结论]4种栽培方式有各自的优缺点。其中手栽秧产量水平最高,但其劳动强度大,种植成本高;机插秧和抛秧正逐渐取代手插秧。     

基于AHP的内蒙古S203公路景观评价指标体系

针对我国草原公路景观环境影响评价多为定性分析、评价内容庞杂无序的现状,通过对我国大量草原公路景观环境的研究、调查及分析,从小尺度方向上分析景观空间格局,提出选取反映出景观破碎度及景观多样化指数、公众关注度等指标体系对草原公路景观进行定量评价;并借助AHP层次分析法,为内蒙古自治区S203路阿拉坦额莫勒至阿木古郎段草原公路景观构建评价指标体系。通过计算分析,并经过工程实施验证后得出本条草原公路景观环境协调性评价结果为良好。此课题的研究成果大部分已成功应用于草原公路建设中,为该条公路的景观改善发挥了重要作用。     

Correlation of cell surface marker expression with African swine fever virus infection

The expression of surface markers on African swine fever virus (ASFV) infected cells was evaluated to assess their involvement in infection. Previous findings indicated CD163 expression was correlated with ASFV susceptibility. However, in this study the expression of porcine CD163 on cell lines did not increase the infection rate of these cells indicating other factors are likely to be important in determining susceptibility to infection. On adherent porcine bone marrow (pBM) cells the expression of CD45 was strongly correlated with infection. CD163 and CD203a expression correlated at intermediate levels with infection, indicating cells expressing these markers could become infected but were not preferentially infected by the virus. Most of the cells expressing MHCII were infected, indicating that they may be preferentially infected although expression of MHCII was not essential for infection and a large percentage of the infected cells were MHCII negative. CD16 showed a marked decrease in expression following infection and significantly lower levels of infected cells were shown to express CD16. Altogether these results suggest CD163 may be involved in ASFV infection but it may not be essential; the results also highlight the importance of other cell markers which requiring further investigation.     

高产优质晚粳新品种‘宝农203’的选育及特性研究

为选育高产优质水稻新品种,宝山区农业良种繁育场以‘武运粳7号’与‘宝农14’杂交F₁代花粉经单倍体生物组培选育成中熟晚粳品种‘宝农203’;其株高105 cm,有效穗210万～300万穗/hm²,每穗总粒数145～155粒,结实率90%,千粒重25～26 g,全生育期约160 d;其特点是高产、米质优良、综合抗性好,适宜于长三角地区及相似生态环境类型水稻区种植。     

Influence of Mercury on Soybean Plants (Glycine max L.) at Low pH

The influence of Hg on soybean plants under different pH conditions and Hg concentrations was studied. Growth inhibition by Hg was higher in roots than the upper part of the plant, but was highly dependant on pH condition. Growth inhibition of roots was observed when Hg concentration was higher than 1 mg Hg L^?1 for pH 4.0 and 5 mg Hg L^?1 for pH 6.0. Using ²⁰³Hg as a radioactive tracer, the amount of Hg (1 mg Hg L^?1) uptake in root was found to be about 1.5 times higher at pH 4.0 than that at pH 6.0; suggesting that Hg when highly accumulated at the lower pH induced inhibition of root growth. Decreased amounts of Hg due to evaporation during the plant growth were very low, but were higher at pH 6.0 than that at pH 4.0. There was hardly any translocation of Hg from roots to the upper parts through the stem within 24 h.     

MicroRNAs as tumour suppressors in canine and human melanoma cells and as a prognostic factor in canine melanomas

Malignant melanoma (MM) is one of the most aggressive cancers in dogs and in humans. However, the molecular mechanisms of its development and progression remain unclear. Presently, we examined the expression profile of microRNAs (miRs) in canine oral MM tissues and paired normal oral mucosa tissues by using the microRNA‐microarray assay and quantitative RT‐PCR. Importantly, a decreased expression of miR‐203 was significantly associated with a shorter survival time. Also, miR‐203 and ‐205 were markedly down‐regulated in canine and human MM cell lines tested. Furthermore, the ectopic expression of miR‐205 had a significant inhibitory effect on the cell growth of canine and human melanoma cells tested by targeting erbb3. Our data suggest that miR‐203 is a new prognostic factor in canine oral MMs and that miR‐205 functions as a tumour suppressor by targeting erbb3 in both canine and human MM cells.     

渝香203在重庆低海拔高产栽培的适宜田间配置方式研究

为明确优质水稻新品种渝香203在重庆低海拔高产栽培的适宜田间配置方式,采用大田试验研究了田间配置方式对水稻茎蘖消长、干物质生产与分配、中后期叶面积指数及剑叶SPAD值、产量及产量构成的影响.结果表明,扩行稀植的方法不仅有利于茎蘖的发生和有效茎蘖数的提高,还有利于增加水稻单株干物质积累量.高产水稻群体齐穗期的地上部干质量为成熟期穗干质量的1.5倍左右,齐穗期主茎5片叶表现为“2＞3≥1≥4 ＞5”的叶长排序.推荐的田间配置方式为26.6 cm×33.3 cm或23.3cm×33.3 cm,种植密度为7500～ 8570穴/666.7 m2,每穴栽插2粒谷苗.