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Zhang X.,CAS Zhengzhou Research Institute
Modern Tunnelling Technology | Year: 2014

In view of the current status of few researches on the fire damage assessment of lining and few guiding specifications, this paper used indexes like apparent damage characteristics, damage depth, residual strength and sound velocity ratios of concrete, etc to analyze fire damage to certain expressway tunnel lining and relevant reinforcement measures. The results show that: qualitative or quantitative assessment of fire damage to lining can be carried out by adopting one or more indexes because of their dependency and consistency. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved. Source

Wang Y.,CAS Institute of Chemistry | Wang X.,CAS Zhengzhou Research Institute | Guo Z.,CAS Institute of Chemistry | Chen Y.,CAS Institute of Chemistry | Chen Y.,CAS Beijing National Laboratory for Molecular
Talanta | Year: 2014

Graphene's unsurpassed specific surface area (up to 2630 m2/g) makes it be an ideal absorbent. To promote its use as a sorption coating in solid phase microextraction, an ultrafast method was established, able to coat a stable layer of graphene on a metal fiber in only 23 s, with adjustable coating thickness between 10 and 40 μm by using sleeve barrels. The core idea includes: (1) use of semi-polymerized dimethylsiloxane as a sticky pre-liner to glue graphene and (2) rapid conversion from pre-liner to elastic polydimethylsiloxane (PDMS) to fix the glued graphene. Ultrafast conversion of the pre-liner to PDMS was achieved by direct heating of the metallic fibers. The method produced very stable and durable fibers, capable of being used for at least 120 extractions-desorption cycles and stored at room temperature for at least 20 months. Interestingly, the new method could always coat a layer of mossy graphene on the fibers to largely increase their extraction capacity. Their limit of detection reached 2 pg/L PAHs, being about 3 orders of magnitude better than that of the reported graphene-based fibers. They were applicable to the direct extraction of trace PAHs in beverages, with a linear regression range from 10 to 1000 pg/L, and recoveries of 88.9-105.3%. The relative standard deviations of peak area were 2.9-8.9% for the same fiber and 3.0-10.0% for different fibers. The method is also suitable for re-coating a used fiber and extendable to fast coating other solid sorbents on heat-resistant supports. © 2013 Elsevier B.V. Source

Lu J.,Zhejiang University | Cao H.,Zhejiang University | Zhang L.,Zhejiang University | Huang P.,Zhejiang University | And 2 more authors.
PLoS Pathogens | Year: 2014

Because of great challenges and workload in deleting genes on a large scale, the functions of most genes in pathogenic fungi are still unclear. In this study, we developed a high-throughput gene knockout system using a novel yeast-Escherichia-Agrobacterium shuttle vector, pKO1B, in the rice blast fungus Magnaporthe oryzae. Using this method, we deleted 104 fungal-specific Zn2Cys6 transcription factor (TF) genes in M. oryzae. We then analyzed the phenotypes of these mutants with regard to growth, asexual and infection-related development, pathogenesis, and 9 abiotic stresses. The resulting data provide new insights into how this rice pathogen of global significance regulates important traits in the infection cycle through Zn2Cys6TF genes. A large variation in biological functions of Zn2Cys6TF genes was observed under the conditions tested. Sixty-one of 104 Zn2Cys6 TF genes were found to be required for fungal development. In-depth analysis of TF genes revealed that TF genes involved in pathogenicity frequently tend to function in multiple development stages, and disclosed many highly conserved but unidentified functional TF genes of importance in the fungal kingdom. We further found that the virulence-required TF genes GPF1 and CNF2 have similar regulation mechanisms in the gene expression involved in pathogenicity. These experimental validations clearly demonstrated the value of a high-throughput gene knockout system in understanding the biological functions of genes on a genome scale in fungi, and provided a solid foundation for elucidating the gene expression network that regulates the development and pathogenicity of M. oryzae. © 2014 Lu et al. Source

Zhou Q.,China University of Petroleum - Beijing | Zhang X.,CAS Zhengzhou Research Institute | Xie G.,Henan Institute of Science and Technology
Analytical Methods | Year: 2011

A simple, rapid and efficient method is described for the simultaneous pre-concentration and determination of phthalate esters and pyrethroid insecticides in water samples by temperature controlled ionic liquid dispersive liquid phase microextraction in combination with high performance liquid chromatography. In this procedure, only ionic liquid 1-octyl-3-methylimidazolium hexafluorophosphate [C8MIM][PF6] was used for the enrichment. The proposed method successfully overcomes the disadvantages of conventional single drop liquid phase microextraction and dispersive liquid-liquid microextraction such as the instability of the suspending drop and the use of toxic solvents, and requires a smaller extraction volume. Factors such as volume of [C8MIM][PF6], sample pH, extraction time, centrifugation time, and temperature and salting-out effect were systematically investigated and optimized. The detection limits obtained for phthalate esters and pyrethroid insecticides were in the range of 0.23-0.47 μg L-1 and the precisions were in the range of 2.2-5.9% (n = 6). Real water samples were used for validating the proposed method and satisfactory results were achieved. © The Royal Society of Chemistry 2011. Source

Li C.M.,CAS Zhengzhou Research Institute
Yi chuan = Hereditas / Zhongguo yi chuan xue hui bian ji | Year: 2011

We identified and characterized a Chinese family with autosomal dominant Brachydactyly type B1 (BDB1). Linkage analysis revealed that the disease gene of the Chinese BDB1 family was linked to ROR2 locus. Mutational hot spot of ROR2 gene was amplified by polymerase chain reaction (PCR) and sequenced directly. A c.2265C>A heterozygous mutation was detected in all of the patients. This mutation led to the change of p.Y755X in protein level and a truncated ROR2 protein losing integrant domains was generated. The mutation was detected in all the patients, but not in all the normal individuals of this family and 50 normal controls. This paper for the first time reported a c.2265C>A mutation in ROR2 gene of a family with BDB1 in China, which enriches ROR2 gene mutation spectrum in Chinese with BDB1. Source

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