Independent and combined associations of upper and lower limb strength with all-cause mortality in community-based older adults: findings from the Chinese Longitudinal Healthy Longevity Survey.

OBJECTIVES: Life expectancy is increasing around the world, and it has been projected that China will have the largest elderly population globally by 2033. This study aimed to examine the association of upper limb strength (ULS) and lower limb strength (LLS) with all-cause mortality based on data from the Chinese Longitudinal Healthy Longevity Survey (2012-2018). STUDY DESIGN: This is a prospective cohort study. METHODS: Participants were 2442 older adults (aged 84.98 ± 11.94 years) recruited from eight regions with a high elderly population in China. Limb muscle strength was evaluated using handgrip strength and objective physical examinations. Cox proportional hazards regression was used to analyse the association of limb muscle strength with all-cause mortality. Demographic characteristics, health status and biological markers were included as confounders. RESULTS: Over a median follow-up period of 42.2 months, 993 participants died. After adjusting for all covariates, low ULS was associated with a higher mortality risk (hazard ratio [HR] = 1.51, 95% confidence interval [CI] = 1.25-1.84), and the association of low LLS with all-cause mortality was only significant for men (HR = 1.36, 95% CI = 1.04-1.79). Participants with combined low ULS and low LLS had the highest risk of mortality compared with participants with normal limb muscle strength (HR = 2.06, 95% CI = 1.61-2.63). The combined association of ULS and LLS with mortality was robust in subgroup and sensitivity analyses. CONCLUSION: Low ULS and low LLS were independently and synergistically associated with a higher all-cause mortality risk. Considering the high prevalence of limb muscle weakness among older adults in China, especially in those aged ≥80 years, limb strength could be considered as an easy-to-perform potential mortality predictor in community health care.

[A retrospective safety study on screening of the samples in the clinical biobank of Beijing Hospital].

To investigate whether the laboratory specimens preserved in Beijing Hospital Biobank during a specific period had been contaminated by SARS-Cov-2 through a cross-sectional study, and to establish a retrospective biobank safety screening system. Laboratory specimens were collected from the Department of Respiratory and Critical Care Medicine and the Fever Clinic of Beijing Hospital from November 1, 2019 to January 22, 2020, nucleic acid and serological antibody testing were performed for SARS-CoV-2 in these specimens (including 79 serum, 20 urine, 42 feces and 21 bronchoalveolar lavage fluid specimens). The safety of the stored samples during this period was defined by negative and positive results. Both the nucleic acid test and serological antibody test showed negative for SARS-CoV-2, indicating that these specimens were safely stored in the biobank. High-risk specimens collected in our hospital during the early stage of the COVID-19 outbreak are free of SARS-CoV-2, and a safety screening strategy for the clinical biobank is established to ensure the biosafety of these samples.

Amelogenin domain-containing NlChP38 is necessary for normal ovulation in the brown planthopper.

The brown planthopper (BPH), Nilaparvata lugens, is a major threat to rice production. The eggshell plays an important role in insect reproduction. The constituents and formation process of BPH eggshells remains largely unknown. Here, we report a novel eggshell-associated protein, NlChP38, containing an amelogenin domain, that is essential for normal ovulation in the BPH. NlChP38 is specifically expressed in the follicular cells from egg chambers at both RNA and protein levels. RNA interference of NlChP38 resulted in oocytes with loose and thin eggshell structure and caused ovulation difficulties. Immunofluorescence localization showed NlChP38 is deposited between follicular cells and oocytes during late choriogenesis. These results indicate that NlChP38 plays an important role in eggshell formation and could be a potential target for RNA interference control of the BPH.

Time-series modelling and forecasting of hand, foot and mouth disease cases in China from 2008 to 2018.

Seasonal autoregressive-integrated moving average (SARIMA) has been widely used to model and forecast incidence of infectious diseases in time-series analysis. This study aimed to model and forecast monthly cases of hand, foot and mouth disease (HFMD) in China. Monthly incidence HFMD cases in China from May 2008 to August 2018 were analysed with the SARIMA model. A seasonal variation of HFMD incidence was found from May 2008 to August 2018 in China, with a predominant peak from April to July and a trough from January to March. In addition, the annual peak occurred periodically with a large annual peak followed by a relatively small annual peak. A SARIMA model of SARIMA (1, 1, 2) (0, 1, 1)12 was identified, and the mean error rate and determination coefficient were 16.86% and 94.27%, respectively. There was an annual periodicity and seasonal variation of HFMD incidence in China, which could be predicted well by a SARIMA (1, 1, 2) (0, 1, 1)12 model.

Selective HDAC6 inhibition decreases early stage of lupus nephritis by down-regulating both innate and adaptive immune responses.

We have demonstrated previously that histone deacetylase (HDAC6) expression is increased in animal models of systemic lupus erythematosus (SLE) and that inhibition of HDAC6 decreased disease. In our current studies, we tested if an orally active selective HDAC6 inhibitor would decrease disease pathogenesis in a lupus mouse model with established early disease. Additionally, we sought to delineate the cellular and molecular mechanism(s) of action of a selective HDAC6 inhibitor in SLE. We treated 20-week-old (early-disease) New Zealand Black (NZB)/White F1 female mice with two different doses of the selective HDAC6 inhibitor (ACY-738) for 5 weeks. As the mice aged, we determined autoantibody production and cytokine levels by enzyme-linked immunosorbent assay (ELISA) and renal function by measuring proteinuria. At the termination of the study, we performed a comprehensive analysis on B cells, T cells and innate immune cells using flow cytometry and examined renal tissue for immune-mediated pathogenesis using immunohistochemistry and immunofluorescence. Our results showed a reduced germinal centre B cell response, decreased T follicular helper cells and diminished interferon (IFN)-γ production from T helper cells in splenic tissue. Additionally, we found the IFN-α-producing ability of plasmacytoid dendritic cells was decreased along with immunoglobulin isotype switching and the generation of pathogenic autoantibodies. Renal tissue showed decreased immunoglobulin deposition and reduced inflammation as judged by glomerular and interstitial inflammation. Taken together, these studies show selective HDAC6 inhibition decreased several parameters of disease pathogenesis in lupus-prone mice. The decrease was due in part to inhibition of B cell development and response.

Time-series analysis of tuberculosis from 2005 to 2017 in China.

Seasonal autoregressive integrated moving average (SARIMA) has been used to model nationwide tuberculosis (TB) incidence in other countries. This study aimed to characterise monthly TB notification rate in China. Monthly TB notification rate from 2005 to 2017 was used. Time-series analysis was based on a SARIMA model and a hybrid model of SARIMA-generalised regression neural network (GRNN) model. A decreasing trend (3.17% per years, P < 0.01) and seasonal variation of TB notification rate were found from 2005 to 2016 in China, with a predominant peak in spring. A SARIMA model of ARIMA (0,1,1) (0,1,1)12 was identified. The mean error rate of the single SARIMA model and the SARIMA-GRNN combination model was 6.07% and 2.56%, and the determination coefficient was 0.73 and 0.94, respectively. The better performance of the SARIMA-GRNN combination model was further confirmed with the forecasting dataset (2017). TB is a seasonal disease in China, with a predominant peak in spring, and the trend of TB decreased by 3.17% per year. The SARIMA-GRNN model was more effective than the widely used SARIMA model at predicting TB incidence.

Renal-infiltrating CD11c+ cells are pathogenic in murine lupus nephritis through promoting CD4+ T cell responses.

Lupus nephritis (LN) is a major manifestation of systemic lupus erythematosus (SLE), causing morbidity and mortality in 40-60% of SLE patients. The pathogenic mechanisms of LN are not completely understood. Recent studies have demonstrated the presence of various immune cell populations in lupus nephritic kidneys of both SLE patients and lupus-prone mice. These cells may play important pathogenic or regulatory roles in situ to promote or sustain LN. Here, using lupus-prone mouse models, we showed the pathogenic role of a kidney-infiltrating CD11c+ myeloid cell population in LN. These CD11c+ cells accumulated in the kidneys of lupus-prone mice as LN progressed. Surface markers of this population suggest their dendritic cell identity and differentiation from lymphocyte antigen 6 complex (Ly6C)low mature monocytes. The cytokine/chemokine profile of these renal-infiltrating CD11c+ cells suggests their roles in promoting LN, which was confirmed further in a loss-of-function in-vivo study by using an antibody-drug conjugate (ADC) strategy targeting CX3 CR1, a chemokine receptor expressed highly on these CD11c+ cells. However, CX3 CR1 was dispensable for the homing of CD11c+ cells into lupus nephritic kidneys. Finally, we found that these CD11c+ cells co-localized with infiltrating T cells in the kidney. Using an ex- vivo co-culture system, we showed that renal-infiltrating CD11c+ cells promoted the survival, proliferation and interferon-γ production of renal-infiltrating CD4+ T cells, suggesting a T cell-dependent mechanism by which these CD11c+ cells promote LN. Together, our results identify a pathogenic kidney-infiltrating CD11c+ cell population promoting LN progression, which could be a new therapeutic target for the treatment of LN.

[Population-based study on infection and genotype distribution of high-risk human among women in rural areas of China, 2014].

Objective: To explore the epidemiologic characterization of high-risk human papillomavirus (HR-HPV) infection and genotype distribution of HR-HPV among women in rural areas of China. Methods: This study used multiple layers of stratified cluster random sampling method. During January to December in 2014, 117 counties of 27 provinces were selected as the HPV test screening pilot project counties. The women aged 35-64 years with rural areas Hukou in these project counties were selected as the study subjects. A total 457 799 women received HPV DNA test. Among them, 118 237 women from 32 counties in 11 provinces received qualified HPV DNA test by fluorescent PCR to detect HPV genotypes. Results: Among 118 237 rural women, the overall HR-HPV positive infection rate was 7.8% (9 249/118 237). The infection rate increased with age and reached an infection peak at the 60-64 age groups (9.9%, 831/8 394). The HR-HPV positive infection rate in western regions (6.9%, 2 144/31 130) was statistical significantly lower than in central regions (8.2%, 1 894/23 023) and eastern regions (8.1%, 5 211/64 084) (χ(2)=51.46, P<0.001). Among 9 249 women with specific genotypes of HR-HPV, 6 496 (97.6%) cases were infected with single HR-HPV type, and 163 cases (2.4% ) were infected with multiple types. HR-HPV type 52, 16 and 58 were the most common infection types in rural areas of China. The single infection rates were 20.9% (1 355/6 496), 18.7% (1 215/6 496), and 11.2% (725/6 496), respectively. The multiple infection rates were 47.2% (77/163), 17.8% (29/163), and 18.4% (30/163), respectively. Conclusion: The HR-HPV positive infection rate in rural areas of Chinese woman was 7.8%, western region has lower infection rate compared with central and eastern regions. HPV 52 was first of the most common genotypes in rural areas of China.

Fine structure characterization of martensite/austenite constituent in low-carbon low-alloy steel by transmission electron forward scatter diffraction.

Transmission electron forward scatter diffraction and other characterization techniques were used to investigate the fine structure and the variant relationship of the martensite/austenite (M/A) constituent of the granular bainite in low-carbon low-alloy steel. The results demonstrated that the M/A constituents were distributed in clusters throughout the bainitic ferrite. Lath martensite was the main component of the M/A constituent, where the relationship between the martensite variants was consistent with the Nishiyama-Wassermann orientation relationship and only three variants were found in the M/A constituent, suggesting that the variants had formed in the M/A constituent according to a specific mechanism. Furthermore, the Σ3 boundaries in the M/A constituent were much longer than their counterparts in the bainitic ferrite region. The results indicate that transmission electron forward scatter diffraction is an effective method of crystallographic analysis for nanolaths in M/A constituents.

Modified recombinant adenoviruses increase porcine circovirus 2 capsid protein expression and induce enhanced immune responses in mice.

Porcine circovirus type 2 (PCV2) is the primary viral pathogen of porcine circovirus associated disease (PCVAD) and vaccination is an important method to prevent and control the disease. The expression of PCV2 capsid protein (Cap) in adenovirus vector system has been investigated, but the poor immune responses limit its application. In this study, transcriptional enhancer element largest intron of the human cytomegalovirus (Intron A) and woodchuck hepatitis virus post-transcriptional regulatory element (WPRE) were applied to increase the immunogenicity of PCV2 Cap adenovirus-based vaccine. Western blot and indirect immunofluorescence assay (IFA) analysis showed that modified adenoviruses with Intron A and WPRE alone or both could significantly increase the expression of Cap compared to the unmodified adenoviruses. Furthermore, the humoral and cellular immune responses of the constructed recombinant adenoviruses were evaluated in mice. Indirect ELISA, virus neutralizing test and western blot showed that modified adenoviruses elicited higher humoral immune responses than unmodified adenovirus, and Intron A-WPRE-modified virus immunized group had better immune response than the others. Besides, the results of lymphocyte proliferation response and cytokines release assay showed that enhanced cellular immune responses were induced by modified adenoviruses. These results demonstrated that Intron A and WPRE significantly improved the expression of the Cap protein in adenovirus vector system and enhanced the immune responses in mice, making the adenovirus vector system more applicable against PCV2.

[Analysis of the reported data of national rural cervical cancer screening project from 2012 to 2013, China].

OBJECTIVE: To analyze the reported data of national rural cervical cancer screening project from 2012 to 2013 and to evaluate the project implementation condition. METHODS: Data of the national breast carcinoma and cervical cancer (two-cancer) screening project for rural women were collected from the online report system of key women and children's public health service programs.The screening items included: preliminary screening of cervical lesions (cervical cytology, using Traian Bethesda System(TBS) or Pap grading for classification and reporting), acetate/iodide staining (VIA/VILI), colposcopy, histopathological examination, and pathological diagnosis. The study collected the quarterly reported data from 1 183 counties of 30 provinces in 2014 and 1 130 counties of 30 provinces in 2013. Chi-square test was used to test the difference of positive detection rate, as well as precancerous cervical lesions, and cervical cancer detection rates among difference preliminary screening methods in 2012 and 2013. RESULTS: In 2012 and 2013, the number of cervical cancer screening was 10 621 482 and 10 321 835. The percentage of using ThinPrep cytological test as the screening method was 77.17% (n=8 196 627) and 77.07% (n=7 954 949) in 2012 and 2013, respectively. Among these ThinPrep cytological tests in these two years, 65.49% (n=5 368 194) and 71.67% (n=5 701 033) used TBS report system. The abnormality rate of colposcopy increased from 27.29% (170 063/623 161) to 31.15% (203 397/652 935) (χ(2)=2 295.94,P<0.001). The abnormality rate of histopathology test increased from 19.54% (37 992/194 394) to 35.43% (59 004/166 518) (χ(2)=11 523.58, P<0.001). All together, 27 341 cervical cancer or precancerous lesions have been detected in these two years. The detection rate of invasive cervical cancer increased from 18.02/100 000 in 2012 to 19.71/100 000 (χ(2)=7.90,P=0.005) in 2013 and that of precancerous lesions rose from 106.85/100 000 to 119.26/100 000 (χ(2)=70.82,P<0.001). The early detection rate was 89.60% (11 883/13 263), and 89.57% (12 609/14 078), respectively in 2012 and 2013. In these two years, the rank of the detection rate of each cervical lesion were CIN1, CIN2, CIN3, invasive carcinoma, adenocarcinoma in situ, and microinvasive carcinoma, from the highest rate to the lowest rate. CONCLUSION: The program has achieved certain screening effect and the screening method has been improved. However, the quality of colposcope and histopathology should be enhanced.

Cloning and characterization of up-regulated HbSINA4 gene induced by drought stress in Tibetan hulless barley.

Hulless barley is an important crop cereal in Tibetan, China. Drought is a major abiotic stress in barley production. In this study, we cloned the drought-related HbSINA4 gene from the variety 'Himalaya 10' and analyzed its expression patterns under different drought and rehydration conditions. The cDNA of HbSINA4 was 1052 bp long, including an open reading frame of 771 bp that encoded a protein of 256 amino acids. The molecular weight of HbSINA4 protein was predicted to be 29.53 kDa and the theoretical pI was 8.32. Bioinformatic analysis showed that the HbSINA4 gene contained a protein kinase domain profile family signature motif, with high similarity to that of Oryza sativa and Brachypodium distachyon. Real-time polymerase chain reaction (PCR) assays revealed that gene expression declined rapidly with increasing drought stress; in contrast, its expression increased after rehydration treatment. Therefore, the HbSINA4 gene responds to the drought stress and plays an important role in barely drought resistance. Furthermore, our results provide information which may be useful in other temperate crop studies and in aiding resistance to drought.

Genetic diversity and relationship of chicory (Cichorium intybus L.) using sequence-related amplified polymorphism markers.

Chicory is a crop with economically important roles and is cultivated worldwide. The genetic diversity and relationship of 80 accessions of chicories and endives were evaluated by sequence-related amplified polymorphism (SRAP) markers to provide a theoretical basis for future breeding programs in China. The polymorphic rate was 96.83%, and the average polymorphic information content was 0.323, suggesting the rich genetic diversity of chicory. The genetic diversity degree of chicory was higher (GS = 0.677) than that of endive (GS = 0.701). The accessions with the highest genetic diversity (effective number of alleles, NE = 1.609; Nei's genetic diversity, H = 0.372; Shannon information index, I = 0.556) were from Italy. The richest genetic diversity was revealed in a chicory line (NE = 1.478, H = 0.289, I = 0.443) among the 3 types (line, wild, and cultivar). The chicory genetic structure of 8 geographical groups showed that the genetic differentiation coefficient (GST) was 14.20% and the number of immigrants per generation (Nm) was 3.020. A GST of 6.80% and an Nm of 6.853 were obtained from different types. This observation suggests that these chicory lines, especially those from the Mediterranean region, have potential for providing rich genetic resources for further breeding programs, that the chicory genetic structure among different countries obviously differs with a certain amount of gene flow, and that SRAP markers could be applied to analyze genetic relationships and classifications of Cichorium intybus and C. endivia.

First Report of Fusarium solani Causing Root Rot on Coptis chinensis in Southwestern China.

China is the world's largest producer country of coptis (Coptis chinensis), the rhizomes of which are used in traditional Chinese medicine. Since 2008, however, root rot symptoms, including severe necrosis and wilting, have been observed on coptis plants in Chongqing, southwestern China. Of the plants examined from March 2011 to May 2013 in 27 fields, 15 to 30% were covered with black necrotic lesions. The leaves of infected plants showed wilt, necrotic lesions, drying, and death. The fibrous roots, storage roots, and rhizomes exhibited brown discoloration and progressive necrosis that caused mortality of the infected plants. Infected plants were analyzed to identify the causal organism. Discoloration of the internal vascular and cortical tissues of the rhizomes and taproots was also evident. Symptomatic taproots of the diseased coptis were surface sterilized in 1% sodium hypochlorite for 2 min, rinsed in sterile distilled water for 2 min, and then air-dried in sterilized atmosphere/laminar flow. Small pieces of disinfested tissue (0.3 cm in length) were transferred to petri dishes containing potato dextrose agar (PDA) supplemented with 125 µg ml-1 streptomycin sulfate and 100 µg ml-1 ampicillin, and incubated for 5 days at 25°C with a 12-h photoperiod. Four distinct species of fungal isolates (HL1 to 4) derived from single spores were isolated from 30 plants with root rot symptoms collected from the study sites. To verify the pathogenicity of individual isolates, healthy coptis plants were inoculated by dipping roots into a conidial suspension (106 conidia/ml) for 30 min (15 plants per isolate), as described previously (1). Inoculated plants were potted in a mixture of sterilized quartz sand-vermiculite-perlite (4:2:1, v/v) and incubated at 25/18°C and 85 to 90% relative humidity (day/night) in a growth chamber with a daily 16-h photoperiod of fluorescent light. Plants dipped in sterile distilled water were used as controls. After 15 days, symptoms similar to those observed in the field were observed on all plants (n = 15) that were inoculated with HL1, but symptoms were not observed on plants inoculated with HL2, HL3, and HL4, nor on control plants. HL1 was re-isolated from symptomatic plants but not from any other plants. Morphological characterization of HL1 was performed by microscopic examination. The septate hyphae, blunt microconidia (2 to 3 septa) in the foot cell and slightly curved microconidia in the apical cell, and chlamydospores were consistent with descriptions of Fusarium solani (2). The pathogen was confirmed to be F. solani by amplification and sequencing of the ribosomal DNA internal transcribed spacer (rDNA-ITS) using the universal primer pair ITS4 and ITS5. Sequencing of the PCR product revealed a 99 to 100% similarity with the ITS sequences of F. solani in GenBank (JQ724444.1 and EU273504.1). Phylogenetic analysis (MEGA 5.1) using the neighbor-joining algorithm placed the HL1 isolate in a well-supported cluster (97% bootstrap value based on 1,000 replicates) with JQ724444.1 and EU273504.1. The pathogen was thus identified as F. solani based on its morphological and molecular characteristics. To our knowledge, this is the first report of root rot of coptis caused by F. solani in the world. References: (1) K. Dobinson et al. Can. J. Plant Pathol. 18:55, 1996. (2) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual. Blackwell Publishing, Oxford, 2006.

Risk factors and etiological characteristics of urinary tract infection in hospitalized continuous ambulatory peritoneal dialysis patients.

OBJECTIVE: This study aimed to explore the risk factors and etiological characteristics of urinary tract infection (UTI) in continuous ambulatory peritoneal dialysis (CAPD) patients. PATIENTS AND METHODS: A total of 90 CAPD patients with UTI comprised the infection group, while 32 CAPD patients without UTI constituted the control group. The risk factors and etiological characteristics of UTI were analyzed. RESULTS: Of the 90 bacterial strains isolated, 30 were Gram-positive (33.3%) and 60 were Gram-negative (66.7%). Urinary stones or urinary tract structural changes were more prevalent in the infection group (71.1%) than in the control group (46.9%) (χ² = 6.076, p = 0.018). The proportion of patients with residual diuresis less than 200 ml was higher in the infection group (50%) than in the control group (15.6%) (χ² = 11.533, p = 0.001). The distribution of primary disease differed between the two groups. Patients in the infection group had higher CAPD vintage, levels of triglycerides, fasting blood glucose, blood creatinine, blood phosphorus, and calcium-phosphorus product than those in the control group. Multivariate binary logistic regression analysis indicated that residual diuresis less than 200 ml (OR = 3.519, p = 0.039) and urinary stones or structural changes (OR = 4.727, p = 0.006) were independent risk factors for UTI. CONCLUSIONS: Urine cultures of CAPD patients with UTI contained a complex distribution of pathogenic bacteria. Urinary stones or structural changes and residual diuresis less than 200 ml were independent risk factors for UTI.

Calponin expression in laryngeal myoepithelial carcinoma and its prognostic implications: a case report and literature review.

A case report of laryngeal myoepithelial carcinoma (MEC) is presented and the literature concerning prognostic factors in MEC is reviewed. A 61-year old man was admitted to hospital with hoarseness and progressive dyspnoea. On examination, both vocal cords were fixed in the midline with a glottic fissure of only 3 mm. No tumour was seen, but the subglottis was not completely visible. A computed tomography scan showed a soft mass below the right vocal cord obstructing two-thirds of the larynx. On suspension laryngoscopy, a dull mass (1.5 x 1.5 cm) was seen below the right vocal cord, which was malignant on frozen biopsy. A total laryngectomy was performed and the patient received radiotherapy. He died of recurrence 25 months later. The tumour was positive for cytokeratin 14, S-100 protein and calponin. MEC of the larynx is extremely rare. The clinical behaviour of MEC is variable and prognostic factors have been poorly analysed. Calponin expression may be a prognostic factor, but other factors also affect the outcome in MEC.

Prognosis and expression of lambda light chains in solitary extramedullary plasmacytoma of the head and neck: two case reports and a literature review.

Two cases of extramedullary plasmacytoma (EMP) of the head and neck, an uncommon plasma cell neoplasm, were studied. Both patients had good outcomes and have been followed for 17 and 12 years without recurrence or systemic disease. In these two cases, the tumours measured were 4 cm and 0.3 cm, and both cases were positive for lambda light chain restriction on immunohistochemistry. Prognostic factors were considered, based on a review of EMP of the head and neck, including published reports and the authors' clinical experience. Of all plasma cell tumours, EMP has the best prognosis, especially when located in the head and neck region. Variation in the biological behaviour of EMP and the limited number of documented cases make it difficult to determine prognostic factors. Some series have found that age, tumour size, site of origin (extramedullary versus bone), grade, M-protein, light chains and radiotherapy dose all influence the outcome in EMP patients.

[Genital Chlamydia trachomatis infection and associated risk factors in male clients attending sexually transmitted disease clinics in 9 cities in Guangdong province].

Objective: To investigate the prevalence of genital Chlamydia trachomatis (GCT) infection and associated risk factors in male clients attending sexually transmitted disease (STD) clinics in Guangdong and provide integrated intervention strategy for this group. Methods: Convenient sampling was used to recruit participants from April to June in 2015 in Guangdong province. The information about their socio-demographic characteristics and sexual behaviors were collected by using a questionnaire, and blood samples were taken from them to test the antibodies against HIV, syphilis and HCV. First pass urine was taken to test GCT and gonorrhea. Results: A total of 1 749 participants with the average age of 39.53 years were recruited. The majority of them were married (73.87%, 1 292/1 749), residents of Guangdong (92.28%, 1 614/1 749) and in Han ethnic group (99.49%, 1 740/1 749). The positive rates for GCT, HIV, syphilis, HCV, Neisseria gonorrhea, and WBC in urinalysis were 6.06% (106/1 749), 0.46% (8/1 749), 3.43% (60/1 749), 0.45% (7/1 550), 2.74% (48/1 749), 7.89% (138/1 749) respectively. Multivariate analysis showed that risk factors for GCT infection include IDUs (OR=13.98, 95%CI: 3.35-58.38), anal sex with men (OR=3.11, 95%CI: 1.45-6.71), Neisseria gonorrhea positive (OR=9.64, 95% CI: 5.09-18.24), and WBC positive (OR=1.96, 95%CI: 1.08-3.55). Conclusions: This study demonstrated the high prevalence of GCT infection in male clients attending STD clinics in Guangdong. Therefore precision intervention should target this population at high-risk.

Inhibitory effects of molybdenum on esophageal and forestomach carcinogenesis in rats.

Male weanling inbred SD rats were given ad libitum a nutritionally adequate semipurified diet and demineralized drinking water without or with 100 or 200 ppm tungsten (W) or 2 or 20 ppm molybdenum (Mo) added to the drinking water. The animals were gastrically intubated with a solution of N-nitrososarcosine ethyl ester (NSEE) from the 4th week twice weekly for 2-8 consecutive weeks. The addition of Mo at either the 2- or 20-ppm level significantly inhibited NSEE-induced esophageal and forestomach carcinogenesis. The 200 ppm W significantly countered the inhibitory effect of a low level of Mo naturally occurring in the diet.

Effects of molybdenum and tungsten on mammary carcinogenesis in SD rats.

Virgin female rats of the SD strain were fed ad libitum a nutritionally adequate semipurified diet and demineralized water (groups 1 and 2), or the same diet with 10 ppm molybdenum (group 3) or 150 ppm tungsten (group 4) added to the drinking water. The animals in groups 2-4 received a single iv injection of 5 mg N-nitroso-N-methylurea (NMU; CAS: 684-93-5)/100 g body weight at 50 days of age. One hundred and twenty-five days after the NMU treatment, group 2 exhibited a 50.0% incidence of mammary carcinoma. Group 4 exhibited a significant increase in carcinoma incidence (79.2%) and the value for group 3 (45.5%) was not significantly different from that of group 2. The carcinoma incidence of group 3 (50.0%) was significantly lower than that of group 2 (90.5%) or group 4 (95.7%) 198 days after NMU treatment.