Objective To propose specific suggestions for exemption management of X-ray devices applying for exemption management. Methods The weight analysis of influence of shielding thickness and tube voltage on the radiation dose leakage of low-energy X-ray devices was carried out through test analysis, and the radiation status of 50 X-ray devices applied for end-user exemption in Shenzhen, China was investigated. Results There was no significant correlation between the ambient dose equivalent rate and the tube voltage and tube current of the X-ray device. The ambient dose equivalent rate of 50 X-ray devices was 0.16-1.20 μSv/h. Among them, 8 X-ray devices had radiation dose leakage, that is, the ambient dose equivalent rate was greater than 0.36 μSv/h; the ambient dose equivalent rate of one X-ray device was 1.2 μSv/h, exceeding exemption management requirements. Conclusion Applications for exemption management and filing of X-ray devices should be treated differently, and their own shielding effect and inherent safety have a greater impact on radiation safety, which should be focused on.

The coronavirus disease 2019 (COVID-19) pandemic is caused by infection with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is spread primary via respiratory droplets and infects the lungs. Currently widely used cell lines and animals are unable to accurately mimic human physiological conditions because of the abnormal status of cell lines (transformed or cancer cells) and species differences between animals and humans. Organoids are stem cell-derived self-organized three-dimensional culture in vitro and model the physiological conditions of natural organs. Here we showed that SARS-CoV-2 infected and extensively replicated in human embryonic stem cells (hESCs)-derived lung organoids, including airway and alveolar organoids which covered the complete infection and spread route for SARS-CoV-2 within lungs. The infected cells were ciliated, club, and alveolar type 2 (AT2) cells, which were sequentially located from the proximal to the distal airway and terminal alveoli, respectively. Additionally, RNA-seq revealed early cell response to virus infection including an unexpected downregulation of the metabolic processes, especially lipid metabolism, in addition to the well-known upregulation of immune response. Further, Remdesivir and a human neutralizing antibody potently inhibited SARS-CoV-2 replication in lung organoids. Therefore, human lung organoids can serve as a pathophysiological model to investigate the underlying mechanism of SARS-CoV-2 infection and to discover and test therapeutic drugs for COVID-19.
Adenosine Monophosphate/therapeutic use* ; Alanine/therapeutic use* ; Alveolar Epithelial Cells/virology* ; Antibodies, Neutralizing/therapeutic use* ; COVID-19/virology* ; Down-Regulation ; Drug Discovery ; Human Embryonic Stem Cells/metabolism* ; Humans ; Immunity ; Lipid Metabolism ; Lung/virology* ; RNA, Viral/metabolism* ; SARS-CoV-2/physiology* ; Virus Replication/drug effects*

Betacoronavirus ; Coronavirus Infections ; Humans ; Pandemics ; Pneumonia, Viral ; Single-Cell Analysis

Objective To evaluate the risk of locoregional recurrence (LRR) and the influencing factors for long-term survival in patients with epithelial-myoepithelial carcinoma (EMCa).Methods A retrospective analysis was performed for 18 EMCa patients, who received initial therapy or initial adjuvant therapy in our hospital from 1999 to 2015, to investigate their survival.Among these patients, 8(44%) underwent surgery alone, 9(50%) received adjuvant radiotherapy, and 1(6%) received radical concurrent chemoradiotherapy.Locoregional recurrence-free survival (LRFS) and overall survival (OS) rates were compared between these groups.The Kaplan-Meier mtthod was used to calculated survival rates and log-rank test was used to compare the LRFS.Results With a median follow-up time of 46 months, 5 patients developed LRR, and the 5-year LRFS and OS rates were 69% and 93%, respectively.The patients treated with radiotherapy had a significantly higher 5-year LRRFS rate than those not treated with radiotherapy (71% vs.57%, P=0.569).Conclusions LRR is the main failure mode of EMCa treatment, and further improving local control is the key to improved survival.

Expanding real-name HIV test is the basis of the real-time reporting system in China,and it plays an important role for the progress.In year of 2003,there were 45 092 cases of HIV positives reported cumulatively,which accounted for only 5.4％ of the estimated population of HIV positives.Since implementation of real-name HIV test and establishment,real-time reporting system,up to year 2005,the total of reported HIV positives was 577 000,which took up 67.9％ of the estimated HIV positives.Also among reported cases,387 000 cases have received the anti-retroviral treatment.Normalization of HIV prevention and control will pave the way to medical insurance for HIV positives.It is a goal that all the people have medical insurance in China,and the normalization is an ideal working condition,and real-name HIV test is a measure for it.The both are very closely connected and improving each anther.

Expanding real-name HIV test is the basis of the real-time reporting system in China,and it plays an important role for the progress.In year of 2003,there were 45 092 cases of HIV positives reported cumulatively,which accounted for only 5.4％ of the estimated population of HIV positives.Since implementation of real-name HIV test and establishment,real-time reporting system,up to year 2005,the total of reported HIV positives was 577 000,which took up 67.9％ of the estimated HIV positives.Also among reported cases,387 000 cases have received the anti-retroviral treatment.Normalization of HIV prevention and control will pave the way to medical insurance for HIV positives.It is a goal that all the people have medical insurance in China,and the normalization is an ideal working condition,and real-name HIV test is a measure for it.The both are very closely connected and improving each anther.

OBJECTIVETo investigate the survival and development conditions of community-based organizations (CBOs) for HIV/AIDS prevention and control among men who have sex with men (MSM) in Chinese cities including Shanghai, Hangzhou, Chongqing.

METHODSThis study employed both qualitative (focus groups) and quantitative (questionnaire survey) methods to obtain information from 15 MSM CBOs in three Chinese cities.

RESULTSThe mean work time of the 15 CBOs for HIV/AIDS prevention and control among MSM was 6.7 years (2.1-11.3 years), and the majority of their funds was from international cooperation projects (80 447 000 RMB, 73.0%) from 2006 to 2013. The survival cost of MSM CBOs apart from expenditure of activities was 2 240-435 360 RMB per year. As it was shown in the graph, the survival and development of MSM CBOs was closely related to the development of international cooperation projects. There was a few small size MSM CBOs taking part in the prevention and control of HIV/AIDS and their work content was limited before 2006. From 2006 to 2008, some international cooperation projects were launched in China, such as the China Global Fund AIDS project and the China-Gates Foundation HIV Prevention Cooperation program. As a result, the number of MSM CBOs was increased sharply, and both the scale and 2012, the performance of these programs further promote the establishment of new MSM CBOs and the development of all MSM CBOs with regard to the work places, full-time staffs, work contents, work patterns and the specific targeted population. After 2012, most international cooperation programs were completed and the local department of disease prevention and control continued to cooperate with MSM CBOs. However, the degree of support funds from the local department was different among different regions. Where the funds were below the half of program funds, the development of MSM CBOs ceased and work slowed down. Besides, there were still some constraints for the survival and development of MSM CBOs, such as insufficient funds, no legitimate identity, the outflow of talents and the unsustainable development.

CONCLUSIONThe survival and development of MSM CBOs was closely related to the development of international cooperation projects in China. Some departments of disease prevention and control took over the cooperation with MSM CBOs when the international cooperation projects were completed. Given the survival cost of MSM CBOs and the constraints of MSM CBOs development, it needs further investigation on how to ensure the local departments of disease prevention and control to take over the cooperation with MSM CBOs and how to cooperate with MSM CBOs.

Acquired Immunodeficiency Syndrome ; China ; Cities ; Communicable Diseases ; Community Health Services ; Financial Support ; HIV Infections ; Homosexuality, Male ; Humans ; International Cooperation ; Male ; Organizations, Nonprofit

Objective To compare knowledge about hypertension between elderly Chinese urban patients with preferences for either traditional Chinese medicine (TCM) or Western medicine (WM).Methods Elderly (≥ 65 years old) patients with hypertension who prefer TCM treatment (n=112) or WM (n=126) were questioned about hypertension.Their answers were compared.Results Only 32.6% of participants correctly identified hypertension as a main risk factor of coronary heart disease and stroke,22.3% of patients answered that the main purpose of hypertension control was preventing cardiovascular disease.Other major reasons for these patients to seek medical treatment for their hypertension included:persuasion by physicians or their family members (21.6%),alleviating symptoms such as headache and dizziness (16.8%),lowering blood pressure without knowing specific reason (12.4%).The predictors for poor knowledge of hypertension were similar irrespective of preference for WM or TCM treatment,and included those with lower levels of education and older age.Television and newspaper (46.8%) were the most frequent sources of hypertension information for both groups.Among those who preferred TCM treatment,TCM has fewer side effects than WM and TCM cures disease while WM only alleviates symptoms were common beliefs held.Conclusion This study shows that knowledge of hypertension is similar among Chinese urban patients with preferences for either WM or TCM treatment and that misunderstandings about hypertension are common among the elderly patients.In order to control hypertension effectively,public health education is necessary.This should target those with a lower level of education and older age.

BACKGROUND: The upward attack of drug-heat is a special type of syndromes of coexistence of cold and heat, it influence the treatment and conversion of the primary disease.OBJECTIVE: To investigate the pathophysiological basis of upward attack of drug-heat.DESIGN: A randomized and controlled observation. SETTING: Department of Traditional Chinese Medicine (TCM) of the People' s Central Hospital of Huizhou City.PARTICIPANTS: Totally 427 patients with cold syndrome, visiting on Department of TCM of the People's Central Hospital of Huizhou City from January 1996 to December 2001, were given warm-heat remedy. Among them 66 cases, 30 males and 36 females, got upward attack of drug-heat during the process of treatment were enrolled. All these subjects, according to their visiting order, at a ratio of 2:1, were chosen as treatment group (44 cases) and control group (22 cases).METHODS: For the patients in treatment group: Rhubarb 6 g was added boiling water 100 mL and soaked for 8 minutes, then the soaking solution was given to the patients, once a day, for 3 days successively. For patients in control group: Table salt 6 g was added boiling water 100 mL for soaking for 8 minutes, after the salt was completely dissolved, the solution was given to the patients, once a day for 3 days successively. The patients of the two groups were at the same time given remedy to treat cold syndrome. The changes of free triiodothyronine (FT3), free thyronine (FT4), high sensitizing thyroid-stimulating hormone (HS-TSH) and cortisol of the patients were detected before and after administration of warm-heat remedy, before and after medication with rhubarb. MAIN OUTCOME MEASURES: ① The changes of the relevant hormones of the patients with upward attack of drug-heat before and after ad ministration of warm-heat remedy. ② The changes of the relevant hormones of the patients with upward attack of drug-heat before and after ad ministration of rhubarb. ③ Comparison of the therapeutic effects in the two groups.RESULTS: All 66 patients involved entered the final result analysis. ①The changes of the relevant hormones of the patients with upward attack of drug-heat before and after administration of warm-heat remedy: FT3 and FT4 were decreased as compared with those before treatment [(2.51±1.20),(6.50±2.30); (10.01±3.21), (15.50±6.31) pmol/L], but HS-TSH and cortisol were increased as compared with those before treatment [(8.25 ±3.75),(4.11±1.75) mU/L; (0.56±0.17), (0.43±0.10) μmol/L]. ② The changes of the relevant hormones of the patients with upward attack of drug-heat before and after administration of rhubarb: FT3 and FT4 ywere increased as compared with those before treatment[(4.71 ±1.56), (2.45±1.25); (14.21 ±4.61),(10.21±3.52) pmol/L], but HS-TSH and cortisol were decreased as compared with those before treatment [(6.24±2.25), (8.35±3.51) mU/L; (0.48±0.10),(0.60±0.17) μmol/L]. ③ Comparison of the therapeutic effects in the two groups: The rate of excellenly effect in treatment group was obviously higher than that in control group (33%, 5%).CONCLUSION: The pathophysiological basis of upward attack of drug heat is stress state of the body, the secretions of the pituitary-thyroid axis play a role of physiological protection, the adrenocortical function is hyperactive, and rhubarb can control this stress state through inhibiting the metabolism of the body.

OBJECTIVE: To observe the effects of ginkgolide (GL) on the cerebral blood flow in dogs. METHODS: Dogs anesthetized with sodium pentobarbital were randomly divided into 5 groups, with 4 dogs in each group. Ginkgolide of 4.86, 14.6 and 43.7 mg/kg and Xingling Granule of 0.22 g/kg were administered by gavage to the dogs in each of 4 groups. The dogs in the other group were administered with edible oil (1 ml/kg) as control group. The cerebral blood flow, systolic blood pressure, diastolic blood pressure, mean arterial blood pressure and electro-cardiogram of the dogs were measured at different times after the administration. RESULTS: Ginkgolide of 4.86, 14.6 and 43.7 mg/kg had no obvious effects on the blood pressure and the heart rate. Ginkgolide of 14.6 and 43.7 mg/kg increased the cerebral blood flow 90 minutes after administration, and ginkgolide of 43.7 mg/kg obviously decreased the cerebral vascular resistance 150 minutes after administration. CONCLUSION: Ginkgolide can increase the cerebral blood flow and decrease the cerebral vascular resistance, and it has no obvious effects on blood pressure and heart rate in dogs.