Investigation on Signal Acquisition and Data Processing of A Fourier Transform Microwave Spectrometer / 分析化学

As one of the most important laboratory tools for the research of quantum chemistry and astrochemistry, a microwave spectrometer can make accurate measurement of molecular spectra arising from rotational transitions. Fourier transform microwave (FTMW) spectrometers, in many cases, require down-conversion mixing plans by using mixers to bring the molecular signal down for A/D sampling, and multiple signal averaging to improve the signal/noise ratio as well. Two detection schemes, homodyne and heterodyne detection modes,were proposed in this project along with two data processing plans, averaging in the time domain and averaging in the frequency domain,to develop efficient,sensitive and accurate detection solutions for molecular rotational spectroscopy. With 0. 5% OCS gas in argon as standard sample, verification experiment was conducted with frequency difference between LO and cavity resonance at 200 MHz and 0.4 MHz. The experimental results indicate that, the heterodyne detection method can provide better sensitivity than the homodyne scheme, but with increased cost for more devices, while the time-domain averaging can obtain much better signal-to-noise ratio than frequency-domain averaging,but with stronger data processing capacity and more time required.

First isolation of quang binh-like virus from mosquitoes in China / 病毒学报

This study aims to investigate the distribution patterns of mosquito-borne viruses in Menghai County, Xishuangbanna Prefecture, Yunnan Province, China and to provide evidence for the prevention and control of mosquito-borne diseases. Mosquito samples were collected using mosquito lamps. Viruses were isolated from the samples by cell culture, and the isolates were identified by RT-PCR. The genomes of isolates were sequenced for phylogenetic analysis. In July 2012, a total of 1468 mosquitoes were captured in Daluo Town of Menghai County; they were divided into 32 pools, including Culex tritaeniorhynchus (28 pools, 1383 mosquitoes), Culex quinquefasciatus (2 pools, 66 mosquitoes), and Anopheles (2 pools, 19 mosquitoes). Golden hamster kidney cells (BHK-21) and Aedes albopictus cells (C6/36) were used for virus isolation. The results showed that C6/36 cells were susceptible to two isolates recovered from Culex tritaeniorhynchus (BNDL1205 and BNDL1227), with marked cytopathic effect (CPE) of cell fusion. By contrast, the two isolates could not cause CPE in BHK-21 cells. RT-PCR was performed for the two isolates using the flavivirus-specific primers FU2/cFD3, and a 800-bp amplicon was obtained from both of them. Phylogenetic analysis showed that the two isolates shared the same evolutionary branch with the Quang Binh virus (QBV) strain VN180, which had been isolated from Vietnam, with nucleotide sequence homologies of 83.4% and 82.9%, respectively. However, there existed relatively large differences in nucleotide sequence between them and other Culex flavivirus strains previously isolated in China and other regions. In light of the similarity between the two isolates and QBV, BNDL1205 and BNDL122 were referred to as Quang Binh-like virus, which were first reported in China.

An outbreak of imported dengue fever from Myanmar to the border of China, with its viral molecular epidemiological features / 中华流行病学杂志

<p><b>OBJECTIVE</b>To understand the epidemiologic characteristics of dengue fever, imported from Myanmar to the border of Yunnan province, China. Viral molecular epidemiologic features were also studied.</p><p><b>METHODS</b>Questionnaires were used on each diagnosed, suspected dengue fever, case or unknown cases with fever when coming from Myanmar entering the port and hospitals in Ruili city of Yunnan province. Serum samples of these patients were collected to detect IgM antibody against dengue virus and RT-PCR assay. Homology and phylogenetic tree based on the whole nucleotide sequence of PrM-C and NS5 gene of dengue virus were further analyzed.</p><p><b>RESULTS</b>A total of 103 sera were collected from patients at acute stage in Ruili city in July to November 2008. Among them, 49 cases were confirmed for dengue fever according to IgM and nucleic acid testings. Except one, other 48 cases were all imported into Ruili, from Myanmar. Of those, 18 patients were residents from Mujie city of Myanmar and hospitalized in Ruili and the rest 30 patients were Chinese citizens who had finished business and returned from Myanmar. Two isolates of serum samples from the imported cases were identified and both homology and phylogenetic analysis were performed, using the nucleotide sequences of PrM and NS5 genes. They were divided into dengue type 1 (RLB61) and dengue type 3 (RLC31) and were closer to the dengue virus strains isolated from Southeast Asia countries.</p><p><b>CONCLUSION</b>It is confirmed that an epidemic of dengue fever which was imported from Myanmar to Ruili city of Yunnan province, China. Evidence also showed that both type I and III epidemic strains of dengue virus did exist in Mujie city of Myanmar in 2008.</p>

Survey on host animal and molecular epidemiology of hantavirus in Chuxiong prefecture, Yunnan province / 中华流行病学杂志

Objective To determine the hosts of hantavirus (HV) and its molecular epidemiological characteristics, to provide evidence for prevention and control on hemorrhagic fever with renal syndrome (HFRS). Methods Rodents were captured by a special trap within the residential area. The antigens of HV in lung tissues were detected by direct immuno-fluorescence assay (DFA). Nucleotide sequences of HV were amplified by RT-PCR with HV genotype-specific primer. The amplified genes were then sequenced. Phylogenetic tree were built on nucleotide sequence with Clusta1X 1.83 software. Results 1421 rodents were captured and classified into 8 species of 4 Genera in the epidemic area within 10 counties of Chuxiong prefecture, Yunnan province, between 2005 and 2006. Out of the 1421 rodents, 1056 (74.31%) of them were Rattus norvegicas and 280 (19.70%) belonged to Rattus flavipectus. The antigens of HV were detected by DFA in lung tissues and the total positive rate of HV was 5.15% (53/ 1029). After applying the sequencing nucleotide method to the 53 positive specimens, data showed that 21 specimens were positive and all of them belonged to Seoul type ( 15 samples were from Rattus norvegicus, 4 samples Rattasflavipectas, 2 samples Rattus nitidas). The partial S segments from 12 specimens were sequenced which appeared homologic with R22, L99 and HLD65 from GenBank in relatively high level (87.1%-99.7%). When compared to 76-118 strain of Hantaan type, their homologic degree was only 64.4%-69.1%. Results from Phylogenetic analysis showed that 12 specimens belonged to Seoul type. As for their homology, they were significantly similar to Seoul type and could be tentatively divided into two subtypes S1 and S3. Conclusion It was confirmed that the Seoul type virus, as HFRS' s pathogenetic agent mainly carried by rats, prevailed widely in Chuxiong prefecture. Owing to the local ecological environment, we also noticed the characteristics of different HV subtypes among Seoul type.

Fractional anisotropy for assessment of white matter tracts injury in methylmalonic acidemia / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Methylmalonic acidemia (MMA) is a multifactorial autosomal recessive inborn error of organic acid metabolism, often presenting with neurological symptoms. As neurological disorders are often related to white matter injury, diffusion tensor imaging (DTI) is an excellent tool for assessment of white matter injury and possibly for diagnosing this disorder.</p><p><b>METHODS</b>We retrospectively analyzed DTI images of 12 patients with MMA (7 males, 5 females, age range: 7 - 12 months, mean age: 9.25 +/- 1.70 months) with negative MRI findings. And another 12 age-matched and gender-matched infants were enrolled as control subjects. Fractional anisotropy (FA) of different white matter tracts of the brain was measured in both groups.</p><p><b>RESULTS</b>For patients with negative MRI findings, compared with healthy infants, a statistically significant reduction in DTI FA value of the frontal white matter, temporal white matter, and occipital white matter was observed (P < 0.01).</p><p><b>CONCLUSIONS</b>In addition to conventional T1W and T2W MR Image, Brain DTI presents a useful, sensitive and complementary tool for the assessment of brain damage in patients with MMA.</p>

Survey on human rabies cases and its viral molecular biological features in Baoshan city, Yunnan province / 中华流行病学杂志

Objective To understand the epidemiological features of two rabies cases in Baoshan city year 2006 and 2007 and to analyze its source of infection.Methods Questionnaires were used to do the epidemiologieal survey on each of the rabies cases.Brain timue samples of rabies patients were collet to detect the rabies virus by direct immunofluoreseence assay(DFA)and RT-PCR assay.Homology and phylogenetic tree were analyzed.based on the whole nucleotide and deduced amino acid sequence of P,M and N gene of rabies virus followed by molecular epidemiological analysis.Results In July 2006,one human rabies case was identified in Longyang district,and another one in Tengchong county in Baoshan city in 2007.The degrees of exposure of these two patients was all at degreeⅢ.Two brain tissue samples among the dead patients(No.CYN0601H and CYN0701H)were confirmed positive by both DFA and RTPCR assay.The homology analysis of P,M and N gene sequences among CYN0601H,CYN0701H and other rabias strains isolated from other provinces and other counties.showed that the samples in Baoshan city shared the highest homology with the strains in Thailand.Phylogenetic analysis indicated that the two samples were very dose and all belonged to genetype 1 Lyssavirus,with the closest relationship between samples in Baoshan city and strains in Thailand.Conclusion It Was confirmed on the virus molecular level that the two patients in Baoshan city were both suffered from rabies.The prevalent strains in Baoshan city WaS probably imported from foreign country,suggesting that prevention and control measures on rabies virus in the boarder areas of Yunnan should be strengthened.

Femoral head coverage rate of CT in evaluation of Salter osteotomy for developmental dislocation of hip in children / 上海第二医科大学学报

Objective To analyse the femoral head coverage rate of CT in evaluation of Salter osteotomy for developmental dislocation of hip(DDH) in children. Methods Thirty-eight patients with unilateral DDH for Salter osteotomy were enrolled,and X ray photography of pelvis and spiral CT scanning of femoral articulation were performed one week before and 6 months after Salter osteotomy.The femoral head coverage rate of X ray and that of CT were calculated and compared.Another 38 children with normal femoral articulation were served as controls. Results The femoral head coverage rate of X ray was significantly higher than that of CT in patients with DDH(P

Effects of modified longdan xiegan decoction on hyperandrogenism in patients with polycystic ovary syndrome of stagnant fire in Gan channel type / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To observe the therapeutic effect of modified Longdan Xiegan Decoction (LXD) on hyperandrogenism in patients with polycystic ovary syndrome (POS) of stagnant fire in Gan channel type.</p><p><b>METHODS</b>Forty-eight patients were divided into two groups: the LXD group (25 cases) treated with LXI) for 3 months, and the Diane-35 group (23 cases) with Diane-35. Condition of menstruation, acne, hairiness were observed, basal body temperature (BBT) was measured, and the serum levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH), prolactin (PRL), free testosterone (FT), and androstenedione (A) were detected before and after 3 months' treatment. Meanwhile, adverse reaction was observed.</p><p><b>RESULTS</b>After treatment, the condition of menstrual disorder, acne and single-phase BBT were improved significantly, and serum levels of LH, LH/FSH, FT and A decreased in both groups (P < 0.05), showed insignificant difference between them (P > 0.05). The PRL level dropped in the LXD group (P < 0.05), which significantly lower than that in the Diane-35 group (P < 0.05). There were 3 cases with adverse reaction of irregular colporrhagia and 5 cases with nausea and vomiting in the Diane-35 group, while no adverse reaction in the LXD group occurred.</p><p><b>CONCLUSION</b>Modified LXD could significantly improve the condition in hyperandrogenism patients with POS of stagnant fire in Gan channel type.</p>

Molecular epidemiology of Xinjiang hemorrhagic fever viruses / 中华实验和临床病毒学杂志

<p><b>BACKGROUND</b>To study the molecular biology of Xinjiang hemorrhagic fever (XHF) viruses, to explore its relationship with other Crimean-Congo hemorrhagic fever viruses, analyzing the epidemic origin and the tendency of geographic distribution of XHF.</p><p><b>METHODS</b>The S partial segment from the patient and tick samples collected in 2001 and 2002 was tested by RT-PCR, the positive samples were sequenced directly. The nucleotide homology of S partial segment as well as the whole segments were analyzed and the phylogenetic tree of S and M gene segments was drawn by computer.</p><p><b>RESULTS</b>All compared sequences of S partial segments from the patient and tick samples showed a high homology of nucleotide sequences. Phylogenetic tree divided all the analyzed viruses into three groups; Europe, African and Asian group. The Asian group can be divided further into another two branches: the middle Asian branch and the Chinese branch. All the Chinese isolates were clustered into one single group and was easy to be discriminated from the other isolates. The dividing of M segments seemed not completely related to the geographic origin of the viruses.</p><p><b>CONCLUSION</b>M segment classification was not consistent to the geographic distribution of the viruses. S segments analysis showed the close relationship of genetic background between the patient isolates and the tick isolates. Besides, all the Chinese isolates have the common evolution route and the gene structure characteristics displayed the regional distribution pattern.</p>

Influence of glucose-insulin-potassium on the levels of inflammatory cytokines and prognosis of MODS in the scalded rats / 中华烧伤杂志

<p><b>OBJECTIVE</b>To evaluate the influence of glucose-insulin-potassium treatment (GIK) on the levels of inflammatory cytokines in the scalded rats with MODS.</p><p><b>METHODS</b>One hundred and twenty Sprague Dawley rats were inflicted with 30% TBSA full-thickness scalding, and MODS model was reproduced with intraperitoneal injection of endotoxin following burn injury. Then the rats were randomly divided into GIK, glucose (G) and control (C) groups, with 40 rats in each group. The serum contents of glucose, lactate acid, TNF-alpha, NO and IL-6 of the rats in the three groups were determined during 1 to 7 PSD, and the mortality rate within 7 PSD was observed.</p><p><b>RESULTS</b>The serum contents of glucose, lactate acid, TNF-alpha, NO and IL-6 of the rats in the GIK group were obviously lower than those in the other two groups during 1 to 7 PSD (P < 0.01), and reached the lowest level at 6 to 7 PSD (TNF-alpha: 2.37 +/- 0.54 microg/L; IL-6: 0.28 +/- 0.17 microg/L; NO: 29 +/- 9 micromol/L). The content of glucose and lactate acid in G group were obviously higher than those in control group (P < 0.01), but the contents of TNF-alpha, IL-6 and NO content were similar between these two groups (P > 0.05). The mortality in GIK group within 7 PSD was 20.0%, which was evidently lower than that in G (37.5%) and C (47.5%) groups (P < 0.05), while that between G and C groups was similar (P > 0.05).</p><p><b>CONCLUSION</b>The administration of GIK might ameliorate sepsis by reducing the levels of inflammatory cytokine after burns and endotoxin challenge.</p>

Investigation of Arboviruses in Lancang river down-stream area in Yunnan province / 中华实验和临床病毒学杂志

<p><b>OBJECTIVE</b>To investigate the epidemic state of arboviruses in the downstream area of Lancang river in Yunnan province.</p><p><b>METHODS</b>Mosquitoes were collected from Lancang river downstream area (including Lancang county and Simao city) during summer in 1998 and stored in liquid nitrogen after classification. The mosquito pools were homogenized and centrifuged, then the supernatant was inoculated into C6/36 cells for virus isolation. New isolates were identified by neutralization test(NT), ELISA, immunofluorescence assay(IFA) and polyacrylamid gel electrophoresis(PAGE).</p><p><b>RESULTS</b>Totally 22 isolates of arbovirus were obtained from 233 mosquito pools by inoculation of C6/36 cells and positive rate of the isolation was 9.4%. Ten strains were resistant to both ether and 5 prime-IDU. So they were non-enveloped double-stranded (ds) RNA virus. Twelve segmented RNAs were shown by PAGE and PAGE profiles from the ten strains were 6-6 with minor variation. The isolates can be neutralized by immunized mouse ascites fluid of BJ95-75 strains of coltivirus by NT, and reacted with monoclonal antibody against BJ95-75 by ELISA. These viruses were identified as coltivirus. Nine isolates were sensitive to ether and resistant to 5 prime-IDU. So they were non-enveloped RNA viruses. PAGE showed 10 segmented RNA, and they were identified to be orbiviruses. Three isolations were sensitive to ether. One of them can be neutralized with JEV A2 strain antibody by NT and was positive to the homologous antibody by IFA. It was identified being strain of JE virus. One strain(YN92-4) can be reacted with anti-bunyavirus group specific immune ascites fluid by both IFA and ElISA, but reacted neither with anti-alpha virus group, nor with anti-flavivirus group JE virus ascites fluid. The virions are spherical and about 87 nm in diameter with surface projections by negative staining. Conclusion Twenty-two isolates have been obtained from wild caught-mosquitoes of Lancang river down-stream area in Yunnan province. Among them ten, nine, one and one were identified as coltivirus, orbivirus, JE virus and bunyavirus, respectively. One is under identification. This is the first report on bunyavirus isolated from mosquitoes in China.</p>

Eosinophilic cystitis in children / 中华放射学杂志

Objective To discuss the clinical manifestations and CT findings of eosinophilic cystitis in chidren.Methods Nine cases including Six boys and 3 girls,three to 13 years old,mean age of 8.3- year,have symptoms of hematuria,irritative voiding,dysuria and abdominal pain。The eosinophilic cystitis was pathologically proved in 7 patients and eosinophilic granulomatous cystitis in 2 patients,which based on cystoscopic tissue biopsy or surgery retrospectively.Results Local thickened bladder walls or nodular and sessile masses along the bladder dome showed in four cases with eosinophilic granulomatous cystitis,and the diffusely irregularly thickened bladder walls showed on CT scans in the rest 5 cases with eosinophilic cystitis.Conclusion CT findings are helpful to reveal the site,size and other features of eosinophilic cystitis in children.But biopsy of the lesion is necessary to rule out other bladder tumor and selecting the proper management.