检索结果-南通市图书馆

维普期刊数据库博看期刊

A feasibility study of applying cone-beam computed tomography to observe dimensional changes in human alveolar bone

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2014年第4期15卷 393-398页

作者： Bei LI yao WANG jun LI Oral Implantology Center at Beijing Stomatological Hospital Affiliated to the Capital Medical University

The purpose of this study was to demonstrate the feasibility of applying cone-beam computed tomography（CBCT） to observe dimensional changes in human alveolar bone continuously after tooth *** patients were selected from a CBCT *** patient had two CBCT scans（CBCT I and CBCT II）,one taken before and one taken after implant surgery.A fixed anatomic reference point was used to orient the horizontal slice of the two *** alveolar ridge width was measured on the horizontal *** each series of CBCT I sagittal slices,the number of slices from the start point to the pulp center of the test tooth was *** tooth length was measured on the sagittal *** each series of CBCT II slices,tooth length was measured on a sagittal slice selected based on the number of slices from the start point to the pulp center recorded in CBCT *** reliability,assessed by the intraclass correlation coefficient（ICC）,was *** sample t-tests of repeated measurements of both tooth length and alveolar bone width showed no statistically significant differences（P0.05）.This study has proved that projection differences among CBCT scans taken at different time points from one patient can be neglected without affecting the accuracy of millimeter scale *** is a reliable imaging tool for continuously observing dimensional changes in human alveolar bone.

关键词： Cone-beam computed tomography Alveolar ridge remodeling Extraction site

Optical monitoring of the Seyfert galaxy NGC 4151 and possible periodicities in its historical light curve

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第8期14卷 923-932页

作者： Di-Fu Guo Shao-Ming hu jun Tao Hong-Xing Yin Xu Chen Hong-Jian Pan Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesSchool of Space Science and PhysicsShandong University Shanghai Astronomical Observatory Chinese Academy of Sciences

We report B, V and R band CCD photometry of the Seyfert galaxy NGC 4151 obtained with the 1.0m telescope at Weihai Observatory of Shandong University and the 1.56 m telescope at Shanghai Astronomical Observatory from 2005 December to 2013 February. Combining all available data from literature, we have constructed a historical light curve from 1910 to 2013 to study the periodicity of the source using three different methods （the Jurkevich method, the Lomb-Scargle periodogram method and the Discrete Correlation Function method）. We find possible periods of P1 = 4 ± 0.1,/92 = 7.5 ±0.3 and P3 = 15.9± 0.3 yr.

关键词： methods data analysis -- galaxies: active -- galaxies individual (NGC 4151)

Petal Development in Lotus japonicus

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2011年第10期53卷 770-782页

作者： Lin Weng Zhaoxia Tian Xianzhong Feng Xin Li Shilei Xu Xiaohe hu Da Luo jun Yang National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Graduate School of the Chinese Academy of Sciences Chinese Academy of Sciences Shanghai 200032 China Key Laboratory of Plant Stress Research of Shandong Province College of Life Sciences Shandong Normal University Jinan 250014 China State Key Laboratory of Biocontrol School of Life Sciences Sun Yat-sen University Guangzhou 510275 China

Previous studies have demonstrated that petal shape and size in legume flowers are determined by two separate mechanisms, dorsoventral （DV） and organ internal （IN） asymmetric mechanisms, respectively. However, little is known about the molecular mechanisms controlling petal development in legumes. To address this question, we investigated petal development along the floral DV axis in Lotus japonicus with respect to cell and developmental biology by comparing wild-type legumes to mutants. Based on morphological markers, the entire course of petal development, from initiation to maturity, was grouped to define 3 phases or 13 stages. In terms of epidermal micromorphology from adaxial surface, mature petals were divided into several distinct domains, and characteristic epidermal cells of each petal differentiated at stage 9, while epidermal cells of all domains were observed until stage 12. TCP and MIXTA-like genes were found to be differentially expressed in various domains of petals at stages 9 and 12. Our results suggest that DV and IN mechanisms interplay at different stages of petal development, and their interaction at the cellular and molecular level guides the elaboration of domains within petals to achieve their ideal shape, and further suggest that TCP genes determine petal identity along the DV axis by regulatincl MIXTA-like clene expression.

关键词： CYC-like TCP genes epidermal cell Lotusjaponicus MIXTA-like genes petal.

In situ resource utilization of lunar soil for highly efficient extraterrestrial fuel and oxygen supply

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第2期10卷 224-231页

作者： Yuan Zhong Jingxiang Low Qing Zhu Yawen Jiang Xiwen Yu Xinyu Wang Fei Zhang Weiwei Shang Ran Long Yingfang yao Wei yao jun Jiang Yi Luo Weihua Wang Jinlong Yang Zhigang Zou Yujie Xiong Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science National Synchrotron Radiation Laboratory School of Information Science and TechnologyUniversity of Science and Technology of China Eco-Materials and Renewable Energy Research Center (ERERC) Jiangsu Key Laboratory for Nano Technology National Laboratory of Solid State MicrostructuresSchool of PhysicsCollaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesNanjing University Qian Xuesen Laboratory of Space Technology China Academy of Space Technology

Building up a lunar settlement is the ultimate aim of lunar ***, limited fuel and oxygen supplies restrict human survival on the ***,we demonstrate the in situ resource utilization of lunar soil for extraterrestrial fuel and oxygen production,which may power up our solely natural satellite and supply respiratory ***,the lunar soil is loaded with Cu species and employed for electro catalytic CO2conversion,demonstrating significant production of *** addition,the selected component in lunar soil(***3) loaded with Cu can reach a CH4F aradaic efficiency of 72.05% with a CH4production rate of 0.8 mL/min at 600 mA/***,an O2production rate of 2.3 mL/min can be ***,we demonstrate that our developed process starting from catalyst preparation to electrocatalytic CO2conversion is so accessible that it can be operated in an unmmaned manner via a robotic *** a highly efficient extraterrestrial fuel and oxygen production system is expected to push forward the development of mankind’s civilization toward an extraterrestrial settlement.

关键词： Chang’E-5 lunar soil fuel production CO2 conversion extraterrestrial settlement in situ resource utilization

河南省20家医院环氧乙烷灭菌质量管理情况调查

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国消毒学杂志 2024年第9期41卷 684-687页

作者：丁丽娜姚卓娅耿军辉李漫春詹朦王俊锋河南省人民医院河南省医疗器械灭菌质控医学重点实验室河南郑州450003

目的了解河南省医院环氧乙烷灭菌器运行和灭菌质量管理现状。方法通过问卷调查方式,对该省20家医院环氧乙烷灭菌器运行和灭菌管理现状进行调查分析。结果20家医院中,18家医院建立了环氧乙烷灭菌管理制度和操作人员的岗位职责;所有医院... 详细信息

目的了解河南省医院环氧乙烷灭菌器运行和灭菌质量管理现状。方法通过问卷调查方式,对该省20家医院环氧乙烷灭菌器运行和灭菌管理现状进行调查分析。结果20家医院中,18家医院建立了环氧乙烷灭菌管理制度和操作人员的岗位职责;所有医院均对环氧乙烷灭菌设置专岗专人负责。环氧乙烷灭菌器工作区域未设置独立的排风系统和未安装环氧乙烷气体浓度超标报警器分别有3家医院。5家医院未定期监测工作场所环境空气中环氧乙烷浓度,仅12家医院每批次进行化学监测。结论河南省医院消毒供应中心的环氧乙烷灭菌质量管理整体较好,但灭菌操作及灭菌效果的规范执行与灭菌的安全保障存在薄弱环节。

关键词：环氧乙烷灭菌器灭菌质量调查

Effects of α-adrenoreceptor antagonists on apoptosis and proliferation of pancreatic cancer cells in vitro

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第15期14卷 2358-2363页

作者： Su-Gang Shen Dong Zhang Heng-Tong hu jun-hui Li Zheng Wang Qing-Yong Ma Department of Hepatobiliary and Pancreas Surgery The First Affiliated Hospital Medical College Xi'an Jiaotong University Xi'an 710061 Shaanxi Province China

AIM: To discuss the expression of α-adrenoreceptors in pancreatic cancer cell lines PC-2 and PC-3 and the effects of α1- and α2-adrenoreceptor antagonists, yohimbine and urapidil hydrochloride, on the cell lines in vitro. METHODS: We cultured the human ductal pancreatic adenocarcinoma cell lines PC-2 and PC-3 and analyzed the mRNA expression of α1- and α2-adrenergic receptors by reverse transcription polymerase chain reaction (RT-PCR). The effects of yohimbine and urapidil hydrochloride on cell proliferation were assessed by 3-(4,5-dimethylthiasol-2-yl)- 2,4,-diphenyltetrazolium bromide (MTT) assay. Apoptosis was detected using the terminal deoxyribonucleotidyl transferase (TdT)-mediated biotin-16-dUTP nick-end labeling (TUNEL) assay and flow cytometry (FCM). RESULTS: PC-2 expressed mRNA in α1- and α2- adrenoreceptors. MTT assays showed that urapidil hydrochloride had no effect on PC-3 cell lines. However, exposure to urapidil hydrochloride increased DNA synthesis in PC-2 cell lines as compared to the control group. PC-2 cell lines were sensitive to both drugs. The proliferation of the 2 cell lines was inhibited by yohimbine. Cell proliferation was inhibited by yohimbine via apoptosis induction. CONCLUSION: The expression of α1- and α2- adrenoreceptors is different in PC-2 and PC-3 cell lines, which might be indicative of their different functions. The α2-adrenoceptor antagonist, yohimbine, can inhibit theproliferation of both cell lines and induce their apoptosis, suggesting that yohimbine can be used as an anticancer drug for apoptosis of PC-2 and PC-3 cells.

关键词： Alpha-adrenoreceptor Pancreatic cancer Yohimbine Urapidil hydrochloride

Incidence,predictors,and prognosis of thrombocytopenia among patients undergoing intra-aortic balloon pumping in the intensive care unit:a propensity score analysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2021年第2期18卷 123-134,I0002页

作者： Wei TONG jun-Mei WANG Jia-Yue LI Pei-yao LI Yun-Dai CHEN Zheng-Bo ZHANG Wei DONG Department of Cardiology the Sixth Medical CentreChinese PLA General HospitalBeijingChina Center for Artificial Intelligence in Medicine Chinese PLA General HospitalBeijingChina CAS Key Laboratory of Genome Sciences and Information Beijing Institute of GenomicsChinese Academy of SciencesChina National Center for BioinformationBeijingChina Global Health Drug Discovery Institute BeijingChina

OBJECTIVE To explore the incidence,predictors,and prognosis of intra-aortic balloon pumping(IABP)-related thrombocytopenia in critically ill *** This multi-center study used the eICU Collaborative Research Database V1.2,comprising data on>130,000 patients from multiple intensive care units(ICUs)in America between 2014 and 2015.A total of 710 patients undergoing IABP were *** was defined as a drop in platelet count>50%from *** the cohort,167 patients who developed thrombocytopenia were matched 1:1 with 167 patients who did not,after propensity score(PS)*** associations between IABP-related thrombocytopenia and clinical outcomes were examined by multivariable logistic *** Among 710 patients undergoing IABP,249 patients(35.07%)developed *** APACHE IVa score was a predictor of thrombocytopenia[adjusted odds ratio(OR)=1.09,95%confidence interval(CI):1.02−1.15].After 1:1 PS matching,in-hospital mortality(adjusted OR=0.76,95%CI:0.37−1.56)and in-ICU mortality(adjusted OR=0.74,95%CI:0.34−1.63)were similar between the thrombocytopenia and non-thrombocytopenia ***,major bleeding occurred more frequently in the thrombocytopenia group(adjusted OR=2.54,95%CI:1.54−4.17).In-hospital length of stay(LOS)and in-ICU LOS were significantly longer in patients who developed thrombocytopenia than in those who did not(9.71 vs.7.36,P<0.001;5.13 vs.2.83,P<0.001).CONCLUSIONS Among patients undergoing IABP in the ICUs,thrombocytopenia was not associated with a difference in inhospital mortality or in-ICU mortality;however,thrombocytopenia was significantly associated with a greater risk of major bleeding and increased in-ICU and in-hospital LOS.

关键词： patients balloon thrombocytopenia

自动化系统在闸坝运行管理中的应用——以二热节制闸为例

在线全文

学校读者我要写书评

暂无评论

海河水利 2024年第1期 116-120页

作者：朴立君胡加玲张楠马新浩北京市城市河湖管理处北京100043

在闸坝运行管理中应用自动化系统,使闸坝运行管理更加智能与高效,通过自动采集数据、远程控制、实时监控等自动化手段,为闸坝的安全运行提供强有力的技术保障,对于提高闸坝的运行管理水平、组建流域水文调度系统具有重要作用。自动化系... 详细信息

在闸坝运行管理中应用自动化系统,使闸坝运行管理更加智能与高效,通过自动采集数据、远程控制、实时监控等自动化手段,为闸坝的安全运行提供强有力的技术保障,对于提高闸坝的运行管理水平、组建流域水文调度系统具有重要作用。自动化系统的推广应用,在很大程度上实现了水利工程管理质量提升,对于水利工程的标准化建设和发展同样有着十分重要的意义。就自动化系统在闸坝运行管理中的应用进行探究,总结运行管理中存在的不足,并提出建议,以期为闸坝运行管理中自动化系统的建设和发展提供参考。

关键词：闸坝自动化系统运行管理二热节制闸

Establishing a predictive model for aspirin resistance in elderly Chinese patients with chronic cardiovascular disease

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2016年第5期13卷 458-464页

作者： Jian CAO Wei-jun HAO Ling-Gen GAO Tian-Meng CHEN Lin LIU Yu-Fa SUN Guo-Liang hu Yi-Xin hu Li FAN Department of Geriatric Cardiology Chinese PLA General Hospital Beijing China Health Division of Guard Bureau General Staff Department of Chinese PLA Beijing China

Background Resistance to anti-platelet therapy is detrimental to patients. Our aim was to establish a predictive model for aspirin resistance to identify high-risk patients and to propose appropriate intervention. Methods Elderly patients （n = 1130） with stable chronic coronary heart disease who were taking aspirin （75 mg） for 〉 2 months were included. Details of their basic characteristics, laboratory test results, and medications were collected. Logistic regression analysis was performed to establish a predictive model for aspirin resistance. Risk score was finally established according to coefficient B and type of variables in logistic regression. The Hosmer-Lemeshow （HL） test and receiver operating characteristic curves were performed to respectively test the calibration and discrimination of the model. Results Seven risk factors were included in our risk score. They were serum creatinine （〉 110 μmol/L, score of 1）; fasting blood glucose （〉 7.0 mmol/L, score of 1）; hyperlipidemia （score of 1）; number of coronary arteries （2 branches, score of 2; 〉 3 branches, score of 4）; body mass index （20-25 kg/m2, score of 2; 〉 25 kg/m2, score of 4）; percutaneous coronary intervention （score of 2）; and smoking （score of 3）. The HL test showed P ≥ 0.05 and area under the receiver operating characteristic curve ≥ 0.70. Conclusions We explored and quantified the risk factors for aspirin resistance. Our predictive model showed good calibration and discriminative power and therefore a good foundation for the further study of patients undergoing anti-platelet therapy.

关键词： Aspirin resistance Cardiovascular disease Predictive model Risk score