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Sun Y.,Tsinghua University | Liu K.,Tsinghua University | Miao J.,Tsinghua University | Wang Z.,Tsinghua University | And 5 more authors.
Nano Letters | Year: 2010

Surface-enhanced Raman scattering (SERS) has attracted wide attention because it can enhance normally weak Raman signal by several orders of magnitude and facilitate the sensitive detection of molecules. Conventional SERS substrates are constructed by placing metal nanoparticles on a planar surface. Here we show that, if the planar surface was substituted by a unique nanoporous surface, the enhancement effect can be dramatically improved. The nanoporous surface can be easily fabricated in batches and at low costs by cross stacking superaligned carbon nanotube films. The as-prepared transparent and freestanding SERS substrate is capable of detecting ambient trinitrotoluene vapor, showing much higher Raman enhancement than ordinary planar substrates because of the extremely large surface area and the unique zero-dimensional at one-dimensional nanostructure. These results not only provide a new approach to ultrasensitive SERS substrates, but also are helpful for improving the fundamental understanding of SERS phenomena. © 2010 American Chemical Society.

Qian H.,Institute of Forensic Science
American Journal of Forensic Medicine and Pathology | Year: 2016

ABSTRACT: This report presents a case of a 40-year-old woman who was found dead in her house. The examination of the body revealed no external injuries. The whole body was scanned by multi–detector-row computed tomography (CT) before autopsy, revealing massive hemorrhage in the right frontal extending into the ventricular system. At autopsy, the brain parenchyma was removed. Then CT angiography was carried on the isolated brain. Computed tomography angiography suggested a mass of irregular, tortuous vessels in areas of hemorrhage in the right frontal lobe of the brain. Finally, histological examination confirmed the result of CT angiography due to an arteriovenous malformation. Hence, postmortem CT angiography played an important role in diagnosis of the cerebral arteriovenous malformation that was responsible for a massive hemorrhage in the skull. © 2016 by Lippincott Williams & Wilkins.

Wang T.,Institute of Forensic Science
American Journal of Forensic Medicine and Pathology | Year: 2016

ABSTRACT: Electrocution cases reported in the literature were mainly caused by low-voltage alternating current, with few cases associated with high-voltage direct current. In this article, we report the case of a 48-year-old woman who unexpectedly and suddenly died in the wild because of electric shock by a high-voltage direct current while hunting. The postmortem inspection found a suspected current mark on her right upper thigh, and histological examination of the suspected current mark revealed a slight elongation of the epidermal cell nuclei and separation of the corneous layer. Metal elements analysis by microbeam x-ray fluorescence spectrometry demonstrated a peak concentration of iron in the suspected current-injured skin surface, which was in line with the metal wire at the scene. In addition, the deceased had coronary atherosclerotic heart disease, which can increase the bodyʼs risk to the current damage. Our results indicated the usefulness of microbeam x-ray fluorescence spectrometry for the forensic diagnosis of electrocution. © 2016 by Lippincott Williams & Wilkins.

Acheroniotes golovranicensis sp. nov. from Golovranica pit (Ljubišnja mountain range, Radovina, SE Bosnia & Herzegovina), the second known species of the genus, is described, illustrated and compared with the congeneric species Acheroniotes mlejneki Lohaj & Lakota, 2010 This new species is characterised by the different shape of pronotum, wider head and by the shape of the apical part of the aedeagus. Data on the distribution and the ecology of this remarkable species are also provided.

Li C.T.,Institute of Forensic Science
Genetics and molecular research : GMR | Year: 2011

Allele frequencies of 30 insertion/deletion polymorphism (InDel) markers previously selected and validated for forensic purposes were assessed in 419 unrelated individuals originating from five different populations of P.R. China, including Chinese Han, Chinese Hui, Uighur, Mongolians, and Tibetans. Hardy-Weinberg equilibrium tests and linkage disequilibrium analysis were performed; the allele frequency distributions of the 30 InDel markers met the conditions for genetic equilibrium in all five populations and the InDel markers on the same chromosome did not generate any linkage blocking. Analysis of molecular variance indicated that genetic variation among the five populations represents only 4% of the total genetic diversity. We determined the cumulative power of discrimination for each population: 0.99999999999841 in Chinese Han, 0.99999999999690 in Chinese Hui, 0.99999999999709 in Uighur, 0.99999999999772 in Mongolians, and 0.99999999999854 in Tibetans.

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