检索结果-南通市图书馆

New upper limits on deviation from the inverse-square law of gravity in the solar system:a Yukawa parameterization

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2期14卷 139-143页

作者： zi-wei li Sheng-Feng Yuan Chang Lu Yi Xie School of Astronomy and Space Science Nanjing University Key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityMinistry of Education

New physics beyond the standard model of particles might cause deviation from the inverse-square law of gravity. In many theoretical models of modified gravity, it is parameterized by the Yukawa correction to the Newtonian gravitational force in terms of two parameters α and λ. Here α is a dimensionless strength parameter and A is a length scale. Using the supplementary advances in perihelia provided by INPOP10a and EPM2011 ephemerides, we obtain new upper limits on the deviation from the inverse-square law when the uncertainty of the Sun＇s quadrupole moment is taken into account. We find that INPOP10a yields the upper limits as α =- 3.1× 10-11 and λ= 0.15 au, and EPM2011 gives α = 5.2 × 10-11 and λ=- 0.21 au. In both of them, α is at least 10 times less than the previous results.

关键词： gravitation -- ephemerides -- celestial mechanics

Predictive value of red blood cell distribution width and hematocrit for short-term outcomes and prognosis in colorectal cancer patients undergoing radical surgery

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第12期30卷 1714-1726页

作者： Dong Peng zi-wei li Fei liu Xu-Rui liu Chun-Yi Wang Department of Gastrointestinal Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China

BACKGROUND Previous studies have reported that low hematocrit levels indicate poor survival in patients with ovarian cancer and cervical cancer,the prognostic value of hematocrit for colorectal cancer(CRC)patients has not been *** prognostic value of red blood cell distribution width(RDW)for CRC patients was *** To investigate the impact of RDW and hematocrit on the short-term outcomes and long-term prognosis of CRC patients who underwent radical *** Patients who were diagnosed with CRC and underwent radical CRC resection between January 2011 and January 2020 at a single clinical center were *** short-term outcomes,overall survival(OS)and disease-free survival(DFS)were compared among the different *** analysis was also conducted to identify independent risk factors for OS and *** There were 4258 CRC patients who underwent radical surgery included in our study.A total of 1573 patients were in the lower RDW group and 2685 patients were in the higher RDW *** were 2166 and 2092 patients in the higher hematocrit group and lower hematocrit group,*** in the higher RDW group had more intraoperative blood loss(Plications(Plications(P<0.01)than did those in the higher hematocrit *** higher RDW group had a worse OS and DFS than did the lower RDW group for tumor node metastasis(TNM)stage I(OS,P<0.05;DFS,P=0.001)and stage II(OS,P=0.004;DFS,P=0.01)than the lower RDW group;the lower hematocrit group had worse OS and DFS for TNM stage II(OS,P<0.05;DFS,P=0.001)and stage III(OS,P=0.001;DFS,P=0.001)than did the higher hematocrit *** hematocrit was an independent risk factor for OS[P=0.017,hazard ratio(HR)=1.256,95%confidence interval(CI):1.041-1.515]and DFS(P=0.035,HR=1.194

关键词： Colorectal cancer Red blood cell distribution width Survival Short-term outcomes

Colonoscopy plays an important role in detecting colorectal neoplasms in patients with gastric neoplasms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第1期16卷 133-143页

作者： Xu-Rui liu Ze-lin Wen Fei liu zi-wei li Xiao-Yu liu wei Zhang Dong Peng Department of Gastrointestinal Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China Department of Gastrointestinal Surgery Yongchuan Hospital of Chongqing Medical UniversityChongqing 402160China

BACKGROUND Gastric cancer(GC)and colorectal cancer(CRC)are the fifth and third most common cancer worldwide,***,GC is reported to have a potential predictive value for CRC,especially for advanced *** To evaluate the necessity of colonoscopy for gastric neoplasm(GN)*** Four databases,including PubMed,EMBASE,the Cochrane library,and Ovid,were used to perform the search strategy on May 2,*** prevalence of colorectal neoplasms(CRN)and baseline characteristics were compared between the neoplasm group and the control *** variables are expressed as the mean difference and standard *** of categorical variables in the two groups are expressed as odds ratios(OR)and 95%confidence intervals(95%CIs).Subgroup analysis according to different kinds of GNs was conducted for more in-depth *** results of this study are represented by forest *** bias was evaluated by a funnel *** data analyses were performed by STATA SE 16.0 *** A total of 3018 patients with GNs and 3905 healthy controls(age and sex matched)were enrolled for *** comparing the prevalence of CRNs between the two groups,CRNs were detected significantly more frequently in GN patients than in controls(OR=1.69,95%CI=1.28 to 2.23,I^(2)=85.12%,P=0.00),especially in patients with GC(OR=1.80,95%CI=1.49 to 2.18,I^(2)=25.55%,P<0.1).Moreover,other risk factors including age(OR=1.08,95%CI=1.00 to 1.17,I^(2)=90.13%,P=0.00)and male sex(OR=2.31,95%CI=1.26 to 4.22,I^(2)=87.35%,P=0.00),were related to the prevalence of *** patients in the GN group,body mass index(BMI,OR=0.88,95%CI=0.80 to 0.98,I^(2)=0.00%,P=0.92)and smoking(OR=1.03,95%CI=1.01 to 1.05,I^(2)=0.00%,P=0.57)were protective and risk factors for CRNs,*** Patients are recommended to undergo colonoscopy when diagnosed with GNs,especially GC patients with a low BMI and a history of smoking.

关键词： Gastric neoplasm Gastric cancer Colorectal neoplasm Colonoscopy

Preliminary limits of a logarithmic correction to the Newtonian gravitational potential in binary pulsars

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第10期14卷 1301-1306页

作者： Chang Lu zi-wei li Sheng-Feng Yuan Zhen Wan Song-He Qin Kai Zhu Yi Xie School of Astronomy and Space Science Nanjing University Key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityMinistry of Education

We obtain preliminary limits on a logarithmic correction to the Newtonian gravitational potential by using five binary pulsars： PSR J0737-3039, PSR B 1534＋12, PSR J 1756-2251, PSR B 1913＋ 16 and PSR B2127＋ 11C. This kind of correction may originate from fundamental frameworks, like string theories, effective models of grav- ity due to quantum effects and the non-local gravity scheme. We estimate the upper limit of the Tohline-Kuhn-Kruglyak parameter A and the lower limit of the Fabris- Campos parameter α, which parameterize the correction and are connected to each other by αλ = -1. By analyzing the advances of periastron of these binary pulsars, we find that the preliminary upper limit of a is 0.19 ± 0.14 kpc^-1 and the prelimi- nary lower limit of ）, is -5.2 4± 3.8 kpc. They are compatible with the bounds based on dynamics of spiral galaxies but quite different from those given by solar system dynamics. These results indicate that this logarithmic correction might be more ob- servable in current timings of binary pulsars than in motions of the solar system.

关键词： gravitation -- relativity -- pulsars individual (PSR 0737-3039, PSRB 1534+12, PSR J1756-2251, PSR B1913+16, PSR B2127+11C)

Corneal subepithelial nerve fibers in type 2 diabetes:potential biomarker of diabetic neuropathy

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第11期17卷 2060-2066页

作者： ling-Rui Meng Hua Chen Wen-Qian Chen Yi Gao zi-wei li zi Ye Zhao-Hui li Senior Department of Ophthalmology the Third Medical CenterChinese PLA General HospitalBeijing 100039China Medical School of Chinese PLA Beijing 100853China

AIM:To observe the changes in corneal subepithelial nerve fibers(CNFs)and Langerhans cells(LCs)in patients with type 2 diabetes using corneal laser confocal microscopy(CLCM).METHODS:A total of 60 patients(64 eyes),including 40 patients with type 2 diabetes(DM group)and 20 subjects without diabetes(control group)were included with *** J plugin of Image J software were used for quantitative analysis of CNF length(CNFL),CNF density(CNFD),corneal nerve branch fiber density(CNBD),main branch length density,branch length density,corneal nerve fiber tortuosity(NT)score,and LCs *** independent samples t-test to analyze the variability between the two groups was performed,and Pearson correlation analysis was used to analyze the relationships between CNF and multiple biochemical indicators in the DM *** predictive power of CNF for type 2 diabetes was assessed using the receiver operating characteristic(ROC)***:There were significant differences in the CNFL,CNFD,and main branch length density between two *** results of Pearson correlation analysis showed a significant negative correlation between CNFD and the duration of diabetes as well as triglyceride levels and total cholesterol,and a significant positive correlation between CNFD and serum *** addition,the NT score showed a positive correlation and urea nitrogen,similar to the positive correlation observed between LC density and glycosylated hemoglobin(HbA1c)*** showed the highest area under the curve(AUC of ROC)value,followed by main branch length density and *** AUC of the ROC curve under the logistic regression model also demonstrated good predictive *** cut-off values of CNFD,CNFL,and main branch length density for diabetes showed 31.25,18.85,and 12.56,***:In patients with type 2 diabetes,there is a notable reduction in both CNFL and *** measurements can be influenced by various blood biochemical ***,the compromised n

关键词： corneal subepithelial nerve diabetes glycated hemoglobin Langerhans cells diabetic neuropathy

Poor oral health was associated with higher risk of gastric cancer: Evidence from 1431677 participants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第2期16卷 585-595页

作者： Fei liu Shi-Jun Tang zi-wei li Xu-Rui liu Quan Lv wei Zhang Dong Peng Department of Gastrointestinal Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China Department of Pediatric Dentistry Stomatological Hospital of Guizhou Medical UniversityGuizhou 550000Guizhou ProvinceChina

BACKGROUND In recent years,the association between oral health and the risk of gastric cancer(GC)has gradually attracted increased ***,in terms of GC incidence,the association between oral health and GC incidence remains *** is reported to increase the risk of ***,some studies have shown that periodontitis has no effect on the risk of ***,the present study aimed to assess whether there is a relationship between oral health and the risk of *** To assess whether there was a relationship between oral health and the risk of *** Five databases were searched to find eligible studies from inception to April 10,***-Ottawa Scale score was used to assess the quality of included *** quality of cohort studies and case-control studies were evaluated separately in this *** of GC were described by odds ratio(OR)and 95%confidence interval(CI).Funnel plot was used to represent the publication bias of included *** performed the data analysis by StataSE *** A total of 1431677 patients from twelve included studies were enrolled for data analysis in this *** to our analysis,we found that the poor oral health was associated with higher risk of GC(OR=1.15,95%CI:1.02-1.29;I2=59.47%,P=0.000.01),gingivitis(OR=1.19,95%CI:0.71-1.67;I2=0.00%,P>0.01),dentures(OR=1.27,95%CI:0.63-1.19;I2=68.79%,P>0.01),or tooth brushing(OR=1.25,95%CI:0.78-1.71;I2=88.87%,P>0.01)had no influence on the risk of ***,patients with periodontitis(OR=1.13,95%CI:1.04-1.23;I2=0.00%,P<0.01)had a higher risk of *** Patients with poor oral health,especially periodontitis,had a higher risk of *** should be concerned about their oral *** oral health might reduce the risk of GC.

关键词： Oral health Tooth loss Periodontitis Gastric cancer Risk factor

Synthesis of Novel Hydrophobic Media and Purification of Recombinant HBsAg

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1999年第1期15卷 41-48页

作者： WANG Yan WANG Qun XIAO Neng-qing liU Da-wei YE Shi-de LUO Xuan GUAN Gui-fan wei zi-li CHEN Wan-ge BAI Fang Changchun Institute of Biological Products Changchun130062 Department of Biochemistry Peking UniversityBeijing100871 Shenyang Rust Proof Packa ging Ma ter ia l Company Shenyang110032

A novel hydrophobic medium with propyl as functional group and Sepharose 6B as matrix was designed and synthesized. The comparison of the hydrophobic medium synthesized with the commercial products was made by hydrophobic interaction chromatography(HIC) in isolating recombinant hepatitis B surface antigen(r HBsAg). r HBsAg was further purified to the final products by following a downstream procedure . The results indicate that the synthesized hydrophobic medium possesses a stable structure and desired physical and chemical properties. They were used to purify r HBsAg with a high yield and purity. Both the immunity and stability of hepatitis vaccine made by the r HBsAg products have reached the same level as other similar kinds of products.

关键词： Chinese hamster ovary(CHO) recombinant hepatitis B surface antigen(r HBsAg) hydrophobic interaction chromatography(HIC) reverse phase haemagglutination assay(RPHA)

Is recovery enhancement after gastric cancer surgery really a safe approach for elderly patients?

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第4期16卷 1334-1343页

作者： zi-wei li Xiao-Juan Luo Fei liu Xu-Rui liu Xin-Peng Shu Yue Tong Quan Lv Xiao-Yu liu wei Zhang Dong Peng Department of Gastrointestinal Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China Department of Endoscopy Center The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400012China

BACKGROUND This study aimed to evaluate the safety of enhanced recovery after surgery(ERAS)in elderly patients with gastric cancer(GC).AIM To evaluate the safety of ERAS in elderly patients with *** The PubMed,EMBASE,and Cochrane library databases were used to search for eligible studies from inception to April 1,*** mean difference(MD),odds ratio(OR)and 95%confidence interval(95%CI)were pooled for *** quality of the included studies was evaluated using the Newcastle-Ottawa Scale *** used Stata(V.16.0)software for data *** This study consists of six studies involving 878 elderly *** analyzing the clinical outcomes,we found that the ERAS group had shorter postoperative hospital stays(MD=-0.51,I2=0.00%,95%CI=-0.72 to-0.30,P=0.00);earlier times to first flatus(defecation;MD=-0.30,I²=0.00%,95%CI=-0.55 to-0.06,P=0.02);less intestinal obstruction(OR=3.24,I2=0.00%,95%CI=1.07 to 9.78,P=0.04);less nausea and vomiting(OR=4.07,I2=0.00%,95%CI=1.29 to 12.84,P=0.02);and less gastric retention(OR=5.69,I2=2.46%,95%CI=2.00 to 16.20,P=0.00).Our results showed that the conventional group had a greater mortality rate than the ERAS group(OR=0.24,I2=0.00%,95%CI=0.07 to 0.84,P=0.03).However,there was no statistically significant difference in major complications between the ERAS group and the conventional group(OR=0.67,I2=0.00%,95%CI=0.38 to 1.18,P=0.16).CONCLUSION Compared to those with conventional recovery,elderly GC patients who received the ERAS protocol after surgery had a lower risk of mortality.

关键词： Enhanced recovery after surgery Gastric cancer Elderly Mortality

Early postoperative complications after transverse colostomy closure,a retrospective study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第3期16卷 807-815页

作者： Fei liu Xiao-Juan Luo zi-wei li Xiao-Yu liu Xu-Rui liu Quan Lv Xin-Peng Shu wei Zhang Dong Peng Department of Gastrointestinal Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China Endoscopy Center The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400012China

BACKGROUND Ostomy is a common surgery usually performed to protect patients from clinical symptoms caused by distal anastomotic leakage after colorectal cancer(CRC)surgery and perforation or to relieve intestinal *** To analyze the complications after transverse colostomy *** Patients who underwent transverse colostomy closure from Jan 2015 to Jan 2022 were retrospectively enrolled in a single clinical *** differences between the complication group and the no complication group were *** regression analyses were conducted to find independent factors for overall complications or incision *** A total of 102 patients who underwent transverse colostomy closure were enrolled in the current ***(68.6%)patients underwent transverse colostomy because of CRC related *** complications occurred in 30(29.4%)patients and the most frequent complication occurring after transverse colostomy closure was incision infection(46.7%).The complication group had longer hospital stays(Plications and incision *** The most frequent complication occurring after transverse colostomy closure surgery in our center was incision *** operation time,interval from transverse colostomy to reversal,and method of anastomosis might have no impact on the postoperative *** should pay more attention to aseptic techniques.

关键词： Transverse colostomy closure Surgery Complications A single clinical centre Risk factors