可信计算系统(TCG)

本文叙述了可信计算系统的概念并提出对可信计算系统的不足和改进     

高温胁迫对禾谷镰孢生长和致病力的影响

为探究高温胁迫对禾谷镰孢生长和致病力的影响, 本研究测定了禾谷镰孢5株耐高温菌株和4株温度敏感型菌株在25℃和30℃下的菌丝生长速率、产孢量、孢子萌发率以及不同胁迫压力下的生长速率、致病力和DON毒素含量等。结果表明, 不论耐高温菌株还是温度敏感型菌株, 30℃高温对其菌丝生长均有抑制作用, 但对产孢量和孢子萌发有促进作用;30℃高温能减轻NaCl和CaCl2胁迫对禾谷镰孢生长的抑制, 但是不影响KCl、刚果红, SDS和H2O2对病原菌的抑制作用;在30℃下, 大部分耐高温菌株的致病力不变或降低, 而大部分温度敏感型菌株的致病力反而增加, 30℃对大部分菌株的DON毒素产量有一定促进作用。研究结果可为研究气候变化下小麦赤霉病的流行和预测提供理论基础。     

云南撒坝猪H-FABP基因多态性及与部分生产性能的关系

采用PCR-RFLP技术检测H-FABP基因5′上游区1125~1817区段HinfⅠ酶切位点在撒坝猪群体中的多态性分布,并采用最小二乘分析模型初步统计分析检测位点多态性与部分生产性能的相关性。结果表明,H-FABP基因等位基因H及基因型Hh在群体中占优势,频率分别为0.6022和0.4194;H-FABP基因在群体中处于Hardy-Weinberg平衡状态;H-FABP基因检测位点基因型间在生长和繁殖性状上不存在不利影响。     

工业企业高炉炉衬侵蚀监测系统的研究动态

本在介绍高炉炼铁工况的基础上。分析了高炉炉体砌层－炉衬的侵蚀机理，对高炉炉衬侵蚀的检测方法进行了探讨。在重点研究了国内外高炉炉衬侵蚀检测方法的前提下，对目前较先进的“触发脉冲响应法（ＦＭＴ）”的原理和优缺点进行了分析。     

桉树焦枯病病原菌特性的观察

对桉树焦枯病病原菌３种典型的５隔膜、３隔膜和１隔膜分生孢子进行了研究。５隔膜病原菌致病力最强，３隔膜次之，１隔膜较弱。匀菌剂菌毒清对３种病原菌有明显的抑制作用。     

无芒雀麦人工草地初级生产力动态的研究

以无芒雀麦人工草地为研究对象，对其生物量的季节及垂动态进行连续４ａ的研究。为促进无芒雀麦草地在河南省的高产丰收提供基础资料及其理论依据。     

ST14/MT-SP1 influences expression of MT2-MMP and TIMP-2 to promote invasiveness of colorectal cancer cells

AIM: To evaluate how ST14/MT-SP1 overexpression alters invasiveness of colorectal cancer cells.METHODS: Human full length ST14/MT-SP1 gene was transiently transfected into colorectal cancer (RKO) cell lines.The expression products were purified by chromatography on Ni2+-affinity resin column and analyzed for gelatinase activity by gelatin zymography.Cell invasion and migration were determined by ECM invasion assay in vitro.RNA was isolated from stable ST14-transfected RKO cells and a cDNA microarray was utilized to detect the change in expression of MMPs and TIMPs.Real-time quantitative PCR was used to validate the change of expression.RESULTS: The full length ST14/MT-SP1 was transfected and expressed in RKO cells.The expressed protein showed a gelatinase activity.In addition,invasiveness of RKO was significantly enhanced by ST14/MT-SP1 overexpression (P<0.01).Blockage of ST14/MT-SP1 resulted in a decrease in the invasiveness of SW480 and SW620 (P<0.01).Furthermore,MT2-MMP (MMP-15) expression was significantly up-regulated (2.5-fold change) and TIMP2 down-regulated (0.35-fold change) by ST14/MT-SP1 overexpression in RKO.CONCLUSION: ST14/MT-SP1 overexpression results in an increase in invasiveness of colorectal cancer RKO cells.Increased invasiveness is due to an increase in the gelatinase activity of ST14/MT-SP1 and a change in up-regulated MT2-MMP and down-regulated TIMP-2 expression.Therefore,ST14/MT-SP1 overexpression enhances invasiveness of colorectal cancer cells.     

天津外环线主要树种枝条枯死原因分析

2007年秋季对天津外环线树木枯枝情况进行了调查分析,发现天津市外环线树木枯枝现象比较普遍,平均枯枝率达29.01%。枯枝最严重的是柳树,其次是白蜡、毛白杨等。外环线外侧树枝的枯死程度明显比内侧树的严重。树龄的大小不是决定树木枯枝的主要因素,环境的影响是决定因素之一,其中地表水的含盐量和含钠量与树木的枯枝程度有密切关系。     

林可霉素水溶性粉剂对由魏氏梭菌引起的鸡坏死性肠炎的药效研究

本文对新兽药制剂林可霉素水溶性剂，用人工感染发病的方法进行了药效学研究。     

Topography and land use effects on the spatial variation of soil organic carbon: A case study in a typical small watershed of the black soil region in northeast China

Soil organic carbon is a soil property of central importance for soil quality and the global carbon cycle. Studies specifically aimed at the relationship between the spatial variation of soil organic carbon and environmental factors are few. In this paper, a typical small watershed named Tongshuang in the black soil region of northeast China, which was subjected to drastic erosion before 1980 and was managed subtly after 1980, was chosen as a study area. Classical statistic and geostatistic analysis methods, in combination with a geographic information system (GIS), were used to quantitatively research the spatial variation characteristics of the soil organic carbon and their relation to the topographic factors and land use. The data on the soil organic carbon, topographic factors, and land use were obtained by soil sampling and measurements derived from DEM, remote sensing images, and field investigations, respectively. The classical statistics analysis results indicated that the variability of the soil organic carbon was moderate (C_v = 0.30). The slope position and land use types were the most discriminating factors. The soil organic carbon content was the highest in the grassland and lowest in the coniferous forest (P < 0.01). It increased gradually along the slope position gradients from the interfluve to the toe slope. The geostatistics analysis showed that the soil organic carbon had a strong spatial correlation. The C₀/(C₀ + C) was 0.1608, which was mainly induced by structural factors. The mean soil organic content is 2.27% in this watershed. It is on a very low level in the northern black soil of northeast China. In this small watershed of the eroded black soil region, the present soil and water conservation measures play an important role in controlling the soil loss. However, the soil organic carbon’s restoration is unsatisfactory. Nearly three-quarters of the land has worrisome productivity. How to improve the soil organic carbon content while targeting the soil fertility is a pressing need. Published in Russian in Pochvovedenie, 2008, No. 1, pp. 44–53. The text was submitted by the authors in English.