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采用种类相似性指数、多样性指数等多项生物学指标分析2009年秋季长江下游段的浮游植物群落特征,并结合理化指标评价其水质营养状态。结果表明:2009年秋季,长江下游段共检出绿藻(Chlorophyta)、硅藻(Bacillariophyta)、蓝藻(Cyanophyta)、裸藻(Euglenophyta)、隐藻(Cryptophyta)5门27种,浮游植物细胞丰度变化在5.68×104~7.08×104 cells/L,平均为6.01×104 cells/L,浮游植物生物量变化在30.43~34.73 μg/L,平均为32.46 μg/L;各采样站位之间的浮游植物相似性指数变化在0.30~0.63,介于轻度相似至中度相似之间;多样性指数变化在2.38~2.73,多样性较好或丰富,显示出长江下游段的浮游植物群落处于较稳定的状态;水质CODMn、TN、TP和TLI(∑)分别变化在2.71~3.23 mg/L、1.24~1.35 mg/L、0.058~0.072 mg/L和44.87~45.96;综合水质生物学和化学评价结果可知2009年秋季长江下游段的水质较好;但从水质评定级别来看,化学评价得出的水质等级与生物学评价得出的水质等级有所不同,显示出两种方法的差异性,因此,生物监测应与理化监测相结合,以提高监测结果的准确性和可靠性。〖 相似文献
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Thomas Chertemps Nicolas Montagné Fran?oise Bozzolan Annick Maria Nicolas Durand Martine Ma?bèche-Coisne 《Die Naturwissenschaften》2012,99(7):537-543
Mast syndrome is a complicated form of human hereditary spastic paraplegias, caused by a mutation in the gene acid cluster protein 33, which encodes a protein designated as “maspardin.” Maspardin presents similarity to the α/β-hydrolase superfamily, but might lack enzymatic activity and rather be involved in protein–protein interactions. Association with the vesicles of the endosomal network also suggested that maspardin may be involved in the sorting and/or trafficking of molecules in the endosomal pathway, a crucial process for maintenance of neuron health. Despite a high conservation in living organisms, studies of maspardin in other animal species than mammals were lacking. In the cotton armyworm Spodoptera littoralis, an insect pest model, analysis of an expressed sequence tag collection from antenna, the olfactory organ, has allowed identifying a maspardin homolog (SlMasp). We have investigated SlMasp tissue distribution and temporal expression by PCR and in situ hybridization techniques. Noteworthy, we found that maspardin was highly expressed in antennae and associated with the structures specialized in odorant detection. We have, in addition, identified maspardin sequences in numerous “nonmammalian” species and described here their phylogenetic analysis in the context of metazoan diversity. We observed a strong conservation of maspardin in metazoans, with surprisingly two independent losses of this gene in two relatively distant ecdysozoan taxa that include major model organisms, i.e., dipterans and nematodes. 相似文献
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Performance of a low cost MBT prior to landfilling: study of the biological treatment of size reduced MSW without mechanical sorting 总被引:3,自引:0,他引:3
In France, the interest in Mechanical Biological Treatment (MBT) prior to landfilling is actually growing. In the absence of acceptance criteria for the waste to be landfilled, an alternative to the intensive, high-technology MBT can only find its place in the French context if it shows substantial benefits from an environmental, economic or operational point of view. This paper presents an experiment of low-cost MBT of size reduced MSW without material splitting. The performance of an experimental, pilot-scale mechanical and biological treatment process has been studied on 37.5 Mg of raw municipal solid waste. The mechanical process has been kept simple with only coarse shredding and no material recovery. The biological treatment, which was a low-cost forced aeration process, was monitored for 25 weeks. The biogas production potential of the waste was reduced by 90% to 19 NL kgDM(-1). The initial AT4 index of 82.9 mg O2 gDM(-1) decreased to 16.0 mg O2 gDM(-1). After 25 weeks of aerobic treatment, the dry mass loss reached 37%, while the mass of waste going to landfill was reduced by 28%. The average performances of the process were explained by the biological process itself, which was not optimal, and also by the characteristics of the input waste. The high particle size of the treated waste and the high content of slowly biodegradable matter (such as paper and cardboard) may both be significant drawbacks for the biological stabilisation of waste. 相似文献