The phytotoxicity of natural tetramic acid derivatives

Natural tetramic acid derivatives have attracted a great deal of interest of chemists because of their structural features and the broad range of biological activities. This paper focuses on five naturally occurring tetramic acid derivatives reported to have phytotoxicity and discusses their common structural characteristics. Copyright © 2011 Society of Chemical Industry     

苦瓜杂交制种技术研究

苦瓜杂交制种父母本在上午7～9时,且每朵雄花授2～4朵雌花,授粉后30天左右采收,种子各项生理指标均达到较理想的水平,可显著提高杂交种子的产量和质量.     

Adsorption of chloride and nitrate by variable charge soils in relation to the electric charge of the soil

A cell consisting of a chloride-selective electrode and a nitrate-selective electrode was directly put in the soil suspension to determine the concentration ratio NO₃^?/Cl^? for studying the adsorption of these two ions by three soil samples from variable charge soils. It was found that such factors as the iron oxide content of the soil, the pH of the suspension, the concentration of the respective anion, the kind of accompanying cations, and the dielectric constant of solvent etc. can all affect the amounts and the ratio of the two anions adsorbed. The adsorption was chiefly caused by coulombic force, but another mechanism, presumably a covalent force between the anion and the metal atom on the surface of soil particles, may also be involved, at least for chloride ions.     

Correlation between shear strength and soil physicochemical properties of different weathering profiles of the non-eroded and collapsing gully soils in southern China

Journal of Soils and Sediments - Collapsing gully erosion is a specific form of soil erosion that is widely distributed in the hilly granitic region of tropical and subtropical southern China and...     

Using computed tomography images to characterize the effects of soil compaction resulting from large machinery on three-dimensional pore characteristics in an opencast coal mine dump

Journal of Soils and Sediments - The use of heavy machinery in mining areas increases during mining and dumping of waste soils, causing severe soil compaction and potentially affecting soil...     

The response of metabolically active Clostridium community to initial pH shift is closely correlated with microbial Fe(III) reduction in flooded paddy soils

Journal of Soils and Sediments - Soil pH could be greatly affected by agriculture practices in paddy soils, in which microbial Fe(III) reduction is a prevalent and important biogeochemical process....     

Identification and Genetic Diversity Analysis of Chinese Mitten Crab(Eriocheir sinensis) in the Liao River Area

Chinese mitten crab(Eriocheir sinensis) is an indigenous and ecologically and economically important species in the Liao River area, but its identification and genetic diversity remain poorly understood. To evaluate the germplasm resources of this species, samples were collected from these locations: four sub-populations from the Liao River area and one population from the Yangtze River area; one primer was used to distinguish between the Liao River and the Yangtze River crabs. Thirteen loci were used for crab genetic diversity analysis, and basic statistics showed that the collecting samples were purebred in the Liao River area. The average observed heterozygosity(H_0) of the Liao River population was 0.5931, and the expected heterozygosity(H_e) was 0.8064. The polymorphism information content(PIC) was 0.7753, which showed that the Liao River population had high genetic diversity. The genetic differentiation index(F_(ST)) averaged 0.0342, meaning a low degree of differentiation; cluster analysis indicated that Hujia(HJ), Xinli(XL) and Chenjia(CJ) sub-populations were allocated to the same cluster, while Baqiangzi(BQZ) sub-population was isolated. In summary, these data demonstrated that the crabs in the Liao River had high genetic diversity, but low genetic differentiation. Thus, the Liao River population had the potential for breeding selection. Furthermore, this study also provided valuable genetic information for the conservation of Chinese mitten crab.     

Heterologous overexpression of resveratrol synthase (PcPKS5) gene enhances antifungal and mite aversion by resveratrol accumulation

European Journal of Plant Pathology - Huping jujube is widely cultivated in northern China. PcPKS5, a resveratrol synthase (STS) gene, contains all functionally divergent plant specific type III...     

燕麦愈伤组织的诱导

以白燕2号为材料,研究了不同的外植体、培养基比例和外植体的放置方式对燕麦愈伤组织诱导的影响,以及最有效的消毒方法。试验结果表明,外植体最有效的消毒方法是采用75%酒精消毒1min后无菌水冲洗,再用30%的次氯酸钠溶液消毒40min(间隔20min换1次);诱导培养基中2,4-D最适浓度为3mg/L;燕麦种子是较理想的外植体,接种时将种子盾片朝下放置直接接触培养基,会得到更高更理想的出愈率。