Chang-qun Duan

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Earthworm toxicity tests are useful tools for terrestrial risk assessment but require a hierarchy of test designs that differ in effect levels (behavior, sublethal, lethal). In this study, the toxicity of chlorpyrifos contaminated soil on earthworms was assessed. In addition to the acute and chronic tests, an avoidance response test was applied. Earthworms(More)
Five yeast strains (Ym24403, Ym24404, Ym24408, Ym24409 and Ym24410(T)) were isolated from different flowers of Erianthus rufipilus (Gramineae), a wild plant growing in the phosphorus-rich region in Yunnan Province, south-western China, and were found to be phenotypically and genetically divergent from currently recognized yeast species. Sequence analysis of(More)
The subcellular distribution of chromium in Leersia hexandra Swartz, a Cr-accumulating plant found in China, was studied by differential centrifugation, transmission electron microscope and energy dispersive analysis of X-ray. Subcellular fractionation of Cr-containing tissues showed that most of the accumulated Cr was isolated to the cell walls in roots(More)
OBJECTIVE To investigate the distribution of congenital heart disease (CHD) aged 3 - 18 in several regions of Yunnan province. METHODS Cross-rectional studies were carried out among 48 638 children from Xishuangbanna, Dali, Baoshan Longling, Luxi Mangshi and Gejiu in Yunnan province with stratified, clustered sampling. RESULTS The overall morbidity of(More)
The sample feeding system of inductively coupled plasma atomic emission spectrometry (ICP-AES) is pneumatic nebulization system, but its efficiency is not good. The ultrasonic nebulization technology possesses advantages of high nebulization efficient and fine droplets, and it is free of blocking phenomenon. It has good application perspective in(More)
Although considerable research has focused on the relationship between ecosystem structure and function, interactions of plant morphological characteristics, species composition and richness with eco-hydrological functions remain unclear. We measured water adherence (i.e. the capacity of a plant species to retain water), documented plant surface morphology(More)
A highly sensitive, selective and rapid method for the determination of zinc based on the rapid reaction of zinc(II) with 2-(2-quinolylazo)-5-dimthylaminophenol (QADMAP) and the solid phase extraction of zinc ion with anion exchange resin cartridge was developed. In the presence of pH 8.5 buffer solution and Triton X-100 medium, QADMAP can react with(More)
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