Objective:To evaluate the feasibility of using a visual positioning system for both motion phantom and clinical quality control.Methods:A phantom experiment was conducted using the Dynamic Thorax Phantom from CIRS. Different ranges of motion were simulated to assess the discrepancies between camera-recorded positions and actual movements. Visual markers were also attached to the treatment bed and the collimator head, and their movements were simulated as part of the experiment. The experiment was repeated for three times. Discrepancies between system measurements and manual measurements were recorded and analyzed to assess the accuracy and reliability of the system.Results:In the motion phantom test, the deviation between the actual motion distance of the phantom and the system's recorded measurement was (0.18±0.07) mm. For linear motion analysis along the X, Y, and Z axes on the treatment table, the measurement errors were (0.14±0.08) mm, (0.15±0.09) mm, and (0.16±0.08) mm, respectively. Additionally, the measurement error in the rotational direction of the treatment couch was 0.18°±0.09°. For the rotational direction of the collimator head, the measurement error was 0.11°±0.02°. Conclusion:The system demonstrates good accuracy and stability, and has potential clinical application value.

Objective:To investigate the protective effect of ferulic acid on PC12 cells injured by H₂O₂ and the molecular mechanisms. Method:The oxidative stress model was established by treating PC12 cells with H₂O₂, and then different dosages of ferulic acid (1, 10, 100 μmol·L^-1) were used for intervention. Methyl thiazolyl tetrazolium (MTT) assay was used to evaluate the cell viability,lactate dehydrogenase (LDH) and malondialdelyde (MDA) in cell supernatant, and superoxidedismutase (SOD) in cells was tested by biochemical method respectively. Insulin-like growth factors-1 (IGF-1) mRNA and protein expressions were detected by Real-time fluorescence quantitative polymerase chain reaction(Real-time PCR) and Western blot. Result:The 24 h intervention with different dosages of ferulic acid (1, 10, 100 μmol·L^-1) could significantly improve the oxidative damage of PC12 cells induced by H₂O₂, compared with the model group, ferulic acid at 1,10,100 μmol·L^-1 significantly increased PC12 cells viability,significantly decreased LDH and MDA content in cell supernatant (P<0.05, P<0.01), and enhanced SOD activity(P<0.01). Real-time PCR and Western blot showed that compared with control group,IGF-1 mRNA and protein expressions in model group decreased significantly (P<0.01), compared with model group, IGF-1 mRNA and protein expressions in ferulic acid group increased significantly (P<0.01). Conclusion:Ferulic acid exerts a protective effect on H₂O₂-inducing PC12 cells injury,which might be related to insulin signaling pathways.

Objective To analyze the epidemiological characteristics of mumps in Hefei City from 2011 to 2016, in order to provide a basis for effective prevention of mumps. Methods The data of mumps in Hefei City from 2011 to 2016 was analyzed by descriptive epidemiology. Results There were a total of 9 678 cases of mumps in Hefei City from 2011 to 2016. The average annual incidence was 22.7/100 000, with the highest in 2013 being 40.56/100 000. Mumps had obvious seasonality with high incidence in spring. Mumps cases increased in winter but the peak was not distinct. The group with the largest number of cases was mainly students, accounting for 64.5% of the total number of cases, followed by childcare and residentially-scattered children. The average annual morbidity of nine counties existed differences( 2=256.845，P<0.001). Conclusions There was a high incidence of mumps in Hefei City from 2011 to 2016. More effective measures should be taken to prevent the incidence of mumps and reduce the spread of mumps virus.

This paper describes a bioassay method for the determination of ansamitocin titers. A fungal strain sensitive to ansamitocin was classified to the genus Trichoderma based on phylogenetic analysis of its ITS sequence, and designated as Trichoderma CPCC 400749. PDA plates of Trichoderma CPCC 400749 were prepared to assay ansamitocin titers of Actinosynnema pretiosum ATCC 31565. The titers were consistent with those determined by HPLC. The bioassay method may have the potential use in high-throughput screening for Actinosynnema pretiosum mutants with improved ansamitocin titers.

Objective:To investigate the effect of electroacupuncture at Jiaji (EX-B2) points and Stomach Meridian Foot-Yang Ming points on the neurological function and the expression of local Synapsin I in rats after spinal cord injury, and to explore its molecular mechanism. Methods:A total of 60 Sprague-Dawley rats were established spinal cord injury model and they were randomly divided into normal control group, Jiaji group and Yang Ming group, with 20 rats in each group. On the third day after operation, Jiaji group and Yang Ming group were treated with electroacupuncture while the normal control group was not. Their neurological function was assessed with BBB every day. Four rats in each group were sacrificed at the end of the 1st, 2nd, 3rd, 4th and 5th week during the intervention period. HE staining was used to observe the morphology of spinal cord. Immumohistochemical staining was used to detect the expression of Synapsin I protein. Reverse transcription real-time quantitative polymerase chain reaction (RT-qPCR) and Western blotting was used to detect the content of of Synapsin I mRNA and protein. Results:The BBB scores were higher in Jiaji group and Yang Ming group than in the normal control group at all the time points (P < 0.05), and were higher in Yang Ming group than in Jiaji group from one to three weeks (P < 0.05). The immunohistochemical scores of Synapsin I protein were higher in Jiaji group than in the normal control group in the first week (P < 0.05), and were higher in Yang Ming group than in the normal control group from one to four weeks (P < 0.05). The immunohistochemical scores of Synapsin I protein were higher in Yang Ming group than in Jiaji group from three to four weeks (P < 0.05). The expression of Synapsin I mRNA and protein first increased and then decreased in the normal control group; which was higher in Jiaji group than in the normal control group in the first week (P < 0.05) and was higher in Yang Ming group than in the normal control group from one to four weeks (P < 0.05). The Synapsin I mRNA expression in the third week and the Synapsin I protein expression from two to three weeks was higher in Yang Ming group than in Jiaji group (P < 0.05). Conclusion:Electroacupuncture at both Jiaji points and Stomach Meridian Foot-Yang Ming points promote the recovery of nerve function in rats with spinal cord injury. It may be related to the elevated level of Synapsin I in the damaged parts of the spinal cord.

Acquired hemophilia A is a deficiency disease caused by blood coagulation factor Ⅷ antibodies due to a variety of causes, The disease incidence rate is extremely low, but the mortality rate is high. This disease is often misdiagnosed,resulting in delays in treatment, so early diagnosis and timely treatment is crucial for reducing the mortality. The principle of treatment for the disease is mainly to control acute bleeding, eradicate inhibitor, and treat the primary disease,therefore, rational and personalized choices of treatment are also critical.

Objective To establish a digital system for forensic identiifcation of the palatal rugae and evaluate its application effects. Methods High-resolution digital images of the palatal rugae were harvested under the standard condition and processed including data collection, noise reduction, contrast enhancement, image segmentation, feature extraction, edge detection, and information matching. Apply an MATLAB software system to develop a digital system for forensic identiifcation of the palatal rugae ,and its application effects were evaluated. Results A digital system for forensic identification of the palatal rugae was successfully established. The digital system had an accuracy rate of 100%. Conclusion Establishing a digital system for forensic identiifcation of the palatal rugae provides a novel method for forensic identiifcation.

Chuangxinmycin (CM) from Actinoplanes tsinanensis was an antibiotic discovered by Chinese scientists about 40 years ago. It contains a new heterocyclic system of indole fused with dihydrothiopyran, whose biosynthetic mechanism remains unclear. CM is used as an oral medicine in the treatment of bacterial infections in China. The simple structure makes CM as an attractive candidate of structure modification for improvement of antibacterial activity. Recently, we analyzed the secondary metabolites of Actinoplanes tsinanensis CPCC 200056, a CM producing strain, as a natural CM analogue. We discovered the first natural CM analogue 3-demethylchuangxinmycin (DCM) as a new natural product. Compared to CM, DCM exhibited a much weaker activity in the inhibition of the bacterial strains tested. The finding provides valuable information for the structure-activity relationship in the biosynthesis of CM.
Anti-Bacterial Agents ; chemistry ; isolation & purification ; China ; Indoles ; chemistry ; isolation & purification ; Micromonosporaceae ; chemistry ; Structure-Activity Relationship

Chuangxinmycin (CM) from Actinoplanes tsinanensis was an antibiotic discovered by Chinese scientists about 40 years ago. It contains a new heterocyclic system of indole fused with dihydrothiopyran, whose biosynthetic mechanism remains unclear. CM is used as an oral medicine in the treatment of bacterial infections in China. The simple structure makes CM as an attractive candidate of structure modification for improvement of antibacterial activity. Recently, we analyzed the secondary metabolites of Actinoplanes tsinanensis CPCC 200056, a CM producing strain, as a natural CM analogue. We discovered the first natural CM analogue 3-demethylchuangxinmycin (DCM) as a new natural product. Compared to CM, DCM exhibited a much weaker activity in the inhibition of the bacterial strains tested. The finding provides valuable information for the structure-activity relationship in the biosynthesis of CM.

BACKGROUNDWith the progress of perinatal medicine and neonatal technology, more and more extremely low birth weight (ELBW) survived all over the world. This study was designed to investigate the short-term outcomes of ELBW infants during their Neonatal Intensive Care Unit (NICU) stay in the mainland of China.

METHODSAll infants admitted to 26 NICUs with a birth weight (BW) < l000 g were included between January l, 2011 and December 31, 2011. All the data were collected retrospectively from clinical records by a prospectively designed questionnaire. The data collected from each NICU transmitted to the main institution where the results were aggregated and analyzed. Categorical variables were performed with Pearson Chi-square test. Binary Logistic regression analysis was used to detect risk factors.

RESULTSA total of 258 ELBW infants were admitted to 26 NICUs, of whom the mean gestational age (GA) was 28.1 ± 2.2 weeks, and the mean BW was 868 ± 97 g. The overall survival rate at discharge was 50.0%. Despite aggressive treatment 60 infants (23.3%) died and another 69 infants (26.7%) died after medical care withdrawal. Furthermore, the survival rate was significantly higher in coastal areas than inland areas (53.6% vs. 35.3%, P = 0.019). BW < 750 g and GA < 28 weeks were the largest risk factors, and being small for gestational age was a protective factor related to mortality. Respiratory distress syndrome was the most common complication. The incidence of patent ductus arteriosus, intraventricular hemorrhage, periventricular leukomalacia, bronchopulmonary dysplasia, retinopathy of prematurity was 26.2%, 33.7%, 6.7%, 48.1%, and 41.4%, respectively. Ventilator associated pneumonia was the most common hospital acquired infection during hospitalization.

CONCLUSIONSOur study was the first survey that revealed the present status of ELBW infants in the mainland of China. The mortality and morbidity of ELBW infants remained high as compared to other developed countries.

China ; Female ; Humans ; Infant ; Infant Mortality ; Infant, Extremely Low Birth Weight ; Infant, Newborn ; Intensive Care Units, Neonatal ; statistics & numerical data ; Male ; Morbidity ; Respiratory Distress Syndrome, Newborn ; mortality ; Retrospective Studies ; Surveys and Questionnaires