Objective To establish an effective qualitative discrimination method for Selaginella medicinal materials.Meth- ods Thin layer chromatography(TLC)method was used.Results The TLC method has a good specialization for identifying Selaginella medicinal materials and can distinguish Selaginella rnoellendorfii from other 10 familiar species in northern areas of Guangdong province.Conclusion The method can help to control the quality of Selaginella moellendorfii Tablet.

Objective To investigate the clinical efficacy of laparoscopic radical gastrectomy in elderly patients with advanced gastric cancer.Methods The clinical data of 85 elderly patients with advanced gastric cancer who were admitted to the Ningbo First Hospital from January 2012 to June 2014 were retrospectively analyzed.Laparoscopic radical gastrectomy was performed on 46 patients (LRG group) and open radical gastrectomy on 39 patients (ORG group).All the patients underwent primary tumor resection for gastric cancer + D2 lymph node dissection,and the postoperative recovery plans were done according to enhanced recovery program.The volume of blood loss,number of lymph node dissected,operation time,intraoperative arterial partial pressure of carbon dioxid (PaCO2),time to anal exsufflation,indwelling time of gastric tube,time for out-off-bed activity,time for fluid diet intake,postoperative hemoglobin,duration of hospital stay and occurrence of complications in the 2 groups were analyzed.The follow-up by outpatient examination and telephone interview was carried out on patients up to August 2014.The count data were analyzed by the chi-square test and Fisher exact probability.The measurement data with normal distribution were presented as x ± s and analyzed using the t test.The t' test was used if the data were deficient.Results Surgical procedures in the 2 groups were successfully carried out and no perioperative death occurred.There was no conversion to open surgery in the LRG group.The resection margins in all the patients were negative.The operation time and number of lymph node dissection in the LRG group were (239 ±68)minutes and 27 ± 10,compared with (227 ±50)minutes and 26 ± 10 in the ORG group,with significant differences (t =0.919,0.179,P ＞ O.05).PaCO2 in the LRG group was (41 ± 5) mmHg (1 mmHg =0.133 kPa),which was significantly higher than(36 ± 5) mmHg in the ORG group (t =4.745,P ＜ 0.05).The volume of blood loss was (102 ± 44)mL in the LRG group,which was significantly less than (200 ± 120) mL in the OPG group (t' =-4.807,P ＜ 0.05).The postoperative level of hemoglobin in the LRG was (110 ± 15) g/L,which was significantly higher than (98 ± 27)g/L in the ORG group (t' =2.471,P ＜ 0.05).The time to anal exsufflation,indwelling time of gastric tube,time for out-off-bed activity,time for fluid diet intake,duration of hospital stay in the LRG group were (2.6 ± 0.7) days,(2.1 ± 0.7) days,(1.1 ± 0.3) days,(4.1 ± 0.7) days and (11 ± 4) days,which were significantly different from (4.8 ± 1.5) days,(4.0 ± 1.8) days,(4.5 ± 0.6) days,(5.9 ± 1.8) days and (18 ± 3) days in the OR G group (t' =-8.415,-6.206,-33.831,-5.879,t =9.632,P＜0.05).Eight patients in the LRG group and 15 patients in the ORG group had complications,with the incidence of complications of 17.4％ (8/46) and 38.5％ (15/39),respectively,showing a significant difference (x2 =4.748,P ＜ 0.05).Forty-four patients in the LRG group and 36 patients in the ORG gorup were followed up for 2-25 months,1 patient in the LRG group and 2 patients in the ORG group died and others had full recovery.Conclusions Laparoscopic radical gastrectomy could provide a safe and complete tumor resection for elderly patients with advanced gastric cancer compared with open radical gastrectomy,meanwhile,it can improve postoperative recovery and reduce postoperative complications in elderly patients with advanced gastric cancer.

Clinical competence was estimated for grades 2011-2013 general practitioners (GPs)trained by the DxR Clinician software.Clinical cases were solved on computer.And the abilities of diagnosis,thinking and handling were assessed.The average score of all GPs was 61.68 ± 10.69.The average score of diagnostic ability was the highest at 71.82 ± 15.47 (weighted score of 25.1).The average score of thinking ability was 62.36 ± 10.40 (weighted score of 28.1).And the average score of handling ability was the least at 42.27 ± 18.22 (weighted score of 8.5).Significant differences in average scores existed between grades 2011 and 2013 (P ＜ 0.05).Significant differences in score of clinical thinking ability existed between grades 2011,2012 and 2013 (P ＜ 0.01) respectively.None of them passed the part of handling.The longer period of training,the higher scores the residents obtained.Since the ability of clinical handling fared the worst,targeted training should be strengthened.

In MAST (mRNA accessible site tagging),the DNA tags from synthesized library were employed for identifying mRNA accessible sites. A large number of tags were amplified and subcloned for sequencing to verify mRNA binding profiles. A PCR was designed by using one primer which bridges over the tag terminal sequences. In PCR reaction DNA tag fragments were concatemerized by a bridge primer in reaction cycles. The concatemerized tag fragments were subcloned and sequenced. Dozens of the concatemerized sequences contained thousands tags. The PCR was a simple,effective way which for sequencing tags in a high through put manner.

Objective - To optimize the extraction and quantification methods for the determination of S phenylmercapturic acid - Methods (SPMA) in urine with performance liquid chromatography mass spectrometry. The urine was hydrolyzed with 50.0% sulfuric acid. The hydrolysate was purified by solid phase extraction column. Purified samples were separated by C18 chromatographic column and detected by tandem mass spectrometry. The isotope labeled SPMA was used as the internal Results - standard. The internal standard curve was used for quantification. The linear range of SPMA was 0.50 50.00 μg/L with the correlation coefficient of 0.999 8. The detection limit and the lower limit of quantification were 0.05 and 0.17 μg/L, - - - - respectively. The recovery rate was 97.0% 102.0%. The within run and between run relative standard deviation were 0.6% 1.0% - and 1.7% 6.5%, respectively. The mass concentration of urinary SPMA in the occupational benzene exposure group was - vs P higher than the non occupational benzene exposure group by this method (median: 2.81 0.28 μg/g creatinine, <0.05). Conclusion Compared to the national standard method, this optimized method of solid phase extraction and internal standard for quantification eliminates the matrix effect. This method is accurate and precise, and is suitable for the determination of SPMA acid in urine.

Objective: To examine the impact of heat waves and cold spells on the incidence of hemorrhagic stroke, so as to provide insights into prevention of hemorrhagic stroke. Methods: Data pertaining to the incidence of hemorrhagic stroke in Zibo City from 2015 to 2019 were collected from Shandong Provincial Management Information System for Chronic Diseases and Cause of Death Surveillance, and the meteorological data during the period from 2015 to 2019 were captured from National Meteorological Information Center of China. The air quality index (AQI) was collected from the National Daily Report of Urban Air Quality in China. Heat wave was defined as the highest daily temperature that was no less than the 90th percentile (P90), P92.5, P95 and P97.5 of the highest daily temperature in the warm season for at least 2, 3 or 4 days, and cold spell was defined as the lowest daily temperature that was no more than the P10, P7.5, P5 and P2.5 of the lowest daily temperature in the cold season for at least 2, 3 or 4 days. The effect of heat waves and cold spells on the incidence of hemorrhagic stroke was evaluated using a generalized additive model and described with relative risk (RR) and its 95%CI. Results: A total of 8 844 case with first-onset hemorrhagic stroke were recorded in Zibo City from 2015 to 2019. The lowest daily temperature that was no more than P10, P7.5 or P5 of the lowest daily temperature in the cold season for at least two days, or that was no more than P10 or P7.5 of the lowest daily temperature for at least 3 days resulted a remarkably increased risk of hemorrhagic stroke (lowest RR=1.187, 95%CI: 1.031-1.366; highest RR=1.242, 95%CI: 1.042-1.480), and after adjusting the effect of daily mean temperature, the lowest daily temperature that was no more than P10 or P7.5 of the lowest daily temperature in the cold season for at least two days, or that was no more than P10 of the lowest daily temperature for at least 3 days resulted a remarkably increased risk of hemorrhagic stroke (lowest RR=1.236, 95%CI: 1.009-1.513; highest RR=1.274, 95%CI: 1.023-1.585). However, there was no significant association between heat waves and the risk of hemorrhagic stroke. Conclusion Cold spells may increase the risk of hemorrhagic stroke, while no significant association is examined between heat waves and the risk of hemorrhagic stroke.

Objective: To study the influence of negative electrets on apoptosis of fibroblast cells and to probe its mechanism. Methods: Fibroblast cell were treated with -300, -500 and -1 000V PTFE electrets for 24, 48 and 72 h, respectively, and the influence of negative electrets on cell apoptosis was studied by means of flow cytometry and transmission electron microscope. Results: Compared with control group, apoptosis cells increased from 0.5% to 10% (some even to 15%) after 24，48 and 72 h action of -300, -500 and -1 000 V electrets. After action of -500 V PTFE electrets for 48-72 h, fibroblast cells showed characteristic morphological features of apoptosis. These features included chromatin aggregation, nuclear and cytoplasmic condensation and partition of cytoplasm and nucleus into membrane bound-vesicles (apoptotic bodies). The effect of negative electrets on apoptosis was in proportion to the time and electric field intensity. Conclusion: Negative electrets can enhance apoptosis of fibroblast cells.

Objective: To study the influence of electret on surface charge of fibroblast cells (3T3 cells) and to probe the relationship between cell growth, apoptosis and cell surface charge. Methods: Electrets Teflon PTFE, ±300 V,±1 000 V were used to treat 3T3 cells for 24, 48 and 72 h. Then the influences of electrets on cell cycle and surface charge of 3T3 cells were studied by flow cytometry and electrophoresis, respectively. Results: (1) After 24 h action of negative electrets, electrophoretic mobility (or surface charge) and cell number in S phase of 3T3 cells were significantly increased compared with those in control group. (2) Effect of negative electrets enhancing cell growth and increasing cell surface charge was in proportional to the surface potential of electret. (3) Surface charge density of apoptotic cell was reduced by electret. (4) After 24 h action of positive electret, the cell number in S and G2 phase were decreased and cell surface charge was also reduced. Conclusion: Negative electret can improve cell growth and increase cell surface charge density. Positive electret can restrain cell growth and reduce cell surface charge density. Surface charge of apoptotic cell is less than that of normal cell.

Objective To investigate the susceptibilities of HCMV clinical strains isolated to ganciclovir from the patients after hematopoietic stem cell transplantation.Methods Eight HCMV clinical isolates were isolated from the blood or the urine of hematopoietic stem cell transplantation recipients who had been treated with GCV.Tissue cell infection median dose(TCID50) were calculated by Reed-Muench method.Drug susceptibility was determined by MTT assay.Results TCID50 values of eight HCMV clinical strains were 10-4.12/0.1ml,10-4.29/0.1ml,10-4.3/0.1ml,10-4.4/0.1ml 10-4.42/0.1ml,10-4.5/0.1ml,10-4.52/0.1ml and 10-4.62/0.1ml respectively.50％ inhibitory concentration(IC50) to GCV of eight HCMV clinical strains were 0.638,1.438,0.965,0.698,0.482,1.167,1.519,1.511 mg/L respectively.Conclusion Our results suggest that resistant HCMV strains are not prevalent in Guangzhou.Continuous monitoring of HCMV is needed to understand the antiviral resistance status of the virus in patients after hematopoietic stem cell transplantation and guide its clinical management.

Objective To outline the research fronts of ten major sub-specialties in internal medicine.Methods Based on their impact factor scores and the proportion of the journals of 10 subspecialties (endocrinology & metabolism,cardiac & cardiovascular systems,hematology,infectious diseases,nephrology,gastroenterology & hepatology,respiratory system,rheumatology,critical care medicine,clinical neurology) in Journal Citation Report (JCR),and careful consulation of expert clinicians,we identified 50 journals.Their bibliographic records (including references) published in 2011 were downloaded,and the frequency of the references (citations) in each sub-specialty was counted and the highly cited records were extracted.We performed a clustering analysis according to the co-cited times among any pairs of the highly cited records.To tag each cluster of highly cited records,we browsed the titles and abstracts of all highly cited records in the same cluster,and concluded the main topics of each cluster.Finally,we extracted the current published papers devoted to particular cluster by some clustering analysis indicators.The clusters of highly cited records were considered as the intelligence base,and the main topics in current papers which citing these highly cited papers were considered as research fronts.Results Totally 50 journals on 10 sub-specialties in internal medicine were identified.A total of 202 highly cited papers,38 clusters (knowledge bases),and 152 corresponding current citing papers presenting the research fronts were selected.Conclusions We confirm and present research fronts in 10 major sub-specialties of internal medicine.This study provides a synchronic structure of contemporary research activities in internal medicine sub-specialties.