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1The Association of Maternal Body Composition and Dietary Intake with the Risk of Gestational Diabetes Mellitus during the Second Trimester in a Cohort of Chinese Pregnant Women显示文摘Objective To investigate the association of maternal body composition and dietary intake with the risk of gestational diabetes mellitus(GDM). Methods A total 154 GDM subjects and 981 controls were enrolled in a prospective cohort study in 11 hospitals from May 20, 2012 to December 31, 2013. Bioelectrical impedance analysis and dietary surveys were used to determine body composition and to evaluate the intake of nutrients in subjects at 21-24 weeks' gestation(WG). Logistic regression analysis was applied to explore the relationships of maternal body composition and dietary intake with the risk of GDM morbidity. Results Age, pre-pregnant body weight(BW), and body mass index(BMI) were associated with increased risk of GDM. Fat mass(FM), fat mass percentage(FMP), extracellular water(ECW), BMI, BW, energy, protein, fat, and carbohydrates at 21-24 WG were associated with an increased risk of GDM. In contrast, fat free mass(FFM), muscular mass(MM), and intracellular water(ICW) were associated with a decreased risk of GDM. Conclusion Maternal body composition and dietary intake during the second trimester of pregnancy were associated with the risk of GDM morbidity.Xu Qing Gao Zhi Ying Li Li Ming Wang Lu Zhang Qian Teng Yue Zhao Xia Ge Sheng Jing Hong Jiang Yang Yong Tao Liu Xiao Jun Lyu Chun Jian Mao Lun Yu Xiao Ming Liu Ying Hua Kong Ai Jing Yang Xue Yan Liu Zhao Zhang Yong Wang Jin Zhang Xin Sheng Xue Chang Yong Lu Yan Ping 2016Biomedical and Environmental Sciences2016,29,1:29
2Current status of diagnosis and treatment of bladder cancer in China-Analyses of Chinese Bladder Cancer Consortium database显示文摘Objective:To investigate current status of diagnosis and treatment of bladder cancer in China.Methods:A database was generated by Chinese Bladder Cancer Consortium(CBCC).From January 2007 to December 2012,14,260 cases from 44 CBCC centers were included.Data of diagnosis,treatment and pathology were collected.Results:The average age was 63.5 year-old and most patients were male(84.3%).The most common histologic types were urothelial carcinoma(91.4%),adenocarcinoma(1.8%),and squamous carcinoma(1.9%).According to 1973 and 2004 WHO grading system,42.0%,41.0%,and 17.0% of patients were grade 1,2,and 3,and 16.0%,48.7%,and 35.3% of patients were papillary urothelial neoplasms of low malignant potential,low,and high grade,respectively.Non-muscle invasive bladder cancer(NMIBC)and muscle invasive bladder cancer(MIBC)were 25.2% and 74.1%,respectively(0.8% not clear).Carcinoma in situ was only 2.4%.Most patients were diagnosed by white-light cystoscopy with biopsy(74.3%).Fluorescence and narrow band imaging cystoscopy had additional detection rate of 1.0% and 4.0%,respectively.Diagnostic transurethral resection(TUR)provided detection rate of 16.9%.Most NMIBCs were treated with TUR(89.2%).After initial TUR,2.6%accepted second TUR,and 45.7%,69.9%,and 58.7% accepted immediate,induced,and maintenance chemotherapy instillation,respectively.Most MIBCs were treated with radical cystectomy(RC,59.7%).Laparoscopic RCs were 35.1%,while open RC 63.4%.Extended and standard pelvic lymph node dissection were 7% and 66%,respectively.Three most common urinary diversions were orthotopic neobladder(44%),ileal conduit(31%),and ureterocutaneostomy(23%).Only 2.3% of patients accepted neo-adjuvant chemotherapy and only 18%of T3 and T4 patients accepted adjuvant chemotherapy.Conclusion:Disease characteristics are similar to international reports,while differences of diagnosis and treatment exist.This study can provide evidences for revisions of the guideline on bladder cancer in China.Kaiwen Li Tianxin Lin Wei Xue Xin Mu Enci Xu Xu Yang Fubao Chen Guangyong Li Lulin Ma Guoliang Wang Chaozhao Liang Haoqiang Shi Ming Li Mao Tang Xueyi Xue Yisong Lv Yaoliang Deng Chengyang Li Zhiwen Chen Xiaozhou Zhou Fengshuo Jin Xudong Liu Jinxin Wei Lei Shi Xin Gou Weiyang He Liqun Zhou Lin Cai Baiye Jin Guanghou Fu Xiangbo Kong Hongyan Sun Ye Tian Lang Feng Tiejun Pan Yiyi Wu Dongwen Wang Hailong Hao Benkang Shi Yaofeng Zhu Qiang Wei Ping Han Changli Wu Dawei Tian Zhangqun Ye Zheng Liu Zhiping Wang Junqiang Tian Lin Qi Minfeng Chen Wei Li Jinchun Qi Gongxian Wang Longlong Fu Zhaolin Sun Guangheng Luo Zhoujun Shen Zhaowei Zhu Jinchun Xing Zhun Wu Dong Wei Xin Chen Yanqun Na Hongfeng Guo Chunxi Wang Zhihua Lu Chuize Kong Yang Liu Jin Yang Jianyun Hu Xin Gao Jielin Li Changjun Yin Pu Li Shan Chen Zhen Du Jiongming Li Yongji Yan Xu Zhang Shuang Huang Fangjian Zhou Zhiling Zhang Yinghao Sun Shuxiong Zeng Song Cen Jiaquan Zhou Hanzhong Li Jin Wen Jian Huang 2015Asian Journal of Urology2015,2,2:21
3RAPD analysis of wild stock of penaeid shrimp (Penaeus chinensis )in Chinese coastal waters of the Huanghai Sea and coastal waters of the Bohai Sea显示文摘Genetic diversity of 32 individuals of P. chinensis in the Chinese coastal waters of the Huanghai and Bobal Seas was detected by RAPD technique. Twenty decamer primers of OPI were used for DNA amplification for each individual. The results showed that: Seventeen primers obtained reproducible fingerprints, and the bands were clear. Thirty--nine of 106 loci detected were polymorphic, amounting to 36. 8 %. Mean genetic distance was 0. 094 1 0. 020 6; 68 markers (63. 2 % of the total) showed stable homogeneity in all of the 32 individuals.Liu Ping Kong Jie Shi Tuo Zhuang Zhimeng Deng Jingyao (l. Huanghai Sea Fisheries Research institute , Chinese Academy of Fishery Sciences, Qingdao 266071, China) 2000Acta Oceanologica Sinica2000,19,1:18
4Current application situation of gastrointestinal endoscopy in China显示文摘AIM:To study the current application situation of gastrointestinal(GI) endoscopy in China's Mainland.METHODS:From 12 August,2011 to 15 February,2012,draft questionnaires were sent by e-mail to 289 hospital-based GI endoscopy units,including units with three levels(provincial,prefecture and county level) in China's Mainland.All the surveyed GI endoscopy units were state-owned and hospital-based.Proportions were compared using χ 2 tests.Comparisons between groups were performed using the Mann-Whitney U test.A probability of P < 0.05 was considered to represent a statistically significant difference.RESULTS:Based on satisfactory replies,169/279(60.6%) of units were enrolled in the survey,which covered 28 provinces(90.3%,28/31) in China's Mainland.Compared with published survey data,the number of GI endoscopes per unit has increased by nearly three times(from 2.9 to 9.3) in the past decade.About 33 of 169(19.5%) endoscopy units possessed an X-ray machine,which was mainly owned by provincial endoscopy units(43.2%,19/44).Video capsule endoscopes,which were almost unavailable ten years ago,were owned by 20.7%(35/169) of GI endoscopy units.Endoscopic submucosal dissection could be performed by 36.4%(19/44) of the provincial units,which was significantly higher than the prefecture level(9.9%,P < 0.01) and county level(0.0%,P < 0.01) units,respectively.CONCLUSION:Rapid development in GI endoscopy has been made in China's Mainland,and major diagnostic endoscopes and therapeutic endoscopy procedures are predominantly used in large endoscopy units.Xiu-Li Zhang Zhong-Sheng Lu Ping Tang Jin-Yan Kong Yun-Sheng Yang 2013World Journal of Gastroenterology2013,19,19:16
5Melittin induces human gastric cancer cell apoptosis via activation of mitochondrial pathway显示文摘AIM: To investigate the apoptotic effects of melittin on SGC-7901 cells via activation of the mitochondrial signaling pathway in vitro.METHODS: SGC-7901 cells were stimulated by melittin, and its effect on proliferation and apoptosis of was investigated by methyl thiazolyl tetrazolium assay, morphologic structure with transmission electron microscopy, annexin-V/propidium iodide double-staining assay, measuring mitochondrial membrane potential(MMP) levels, and analyzing reactive oxygen species(ROS) concentrations were analyzed by flow cytometry. Cytochrome C(Cyt C), apoptosis-inducing factor(AIF), endonuclease G(Endo G), second mitochondria-derived activator of caspases(Smac)/direct IAP binding protein with low isoelectric point(Diablo), and FAS were analyzed by western blot. The expression of caspase-3 and caspase-8 was measured using activity assay kits.RESULTS: Melittin was incubated at 1.0, 2.0, 4.0, or 6.0 μg/m L for 1, 2, 4, 6, or 8 h and showed a timeand concentration-dependent inhibition of SGC-7901 cell growth. Melittin induced SGC-7901 cell apoptosis, which was confirmed by typical morphological changes. Treatment with 4 μg/m L melittin induced early apoptosis of SGC-7901 cells, and the early apoptosis rates were 39.97% ± 3.19%, 59.27% ± 3.94%, and 71.50% ± 2.87% vs 32.63% ± 2.75% for 1, 2, and 4 h vs 0 h(n = 3, P < 0.05); the ROS levels were 616.53% ± 79.78%, 974.81% ± 102.40%, and 1330.94% ± 93.09% vs 603.74% ± 71.99%(n = 3, P < 0.05); the MMP values were 2.07 ± 0.05, 1.78 ± 0.29, and 1.16 ± 0.25 vs 2.55 ± 0.42(n = 3, P < 0.05); caspase-3 activity was significantly higher compared to the control(5492.3 ± 321.1, 6562.0 ± 381.3, and 8695.7 ± 449.1 vs 2330.0 ± 121.9), but the caspase activity of the non-tumor cell line L-O2 was not different from that of the control. With the addition of the caspase-3 inhibitor(Ac-DEVD-CHO), caspase-3 activity was significantly decreased compared to the control group(1067.0 ± 132.5 U/g vs 8695.7 ± 449.1 U/g). The expression of the Cyt C, Endo G, and AIF proteins in SGC-7901 cells was significantly higher than those in the control(P < 0.05), while the expression of the Smac/Diablo protein was significantly lower than the control group after melittin exposure(P < 0.01). Ac-DEVD-CHO did not, however, have any effect on the expression of caspase-8 and FAS in the SGC-7901 cells.CONCLUSION: Melittin can induce apoptosis of human gastric cancer(GC) cells through the mitochondria pathways, and it may be a potent agent in the treatment of human GC.Gui-Mei Kong Wen-Hua Tao Ya-Li Diao Peng-Hua Fang Ji-Jun Wang Ping Bo Feng Qian 2016World Journal of Gastroenterology2016,22,11:15
63D Shapeable,Superior Electrically Conductive Cellulose Nanofibers/Ti_(3)C_(2)T_(x) MXene Aerogels/Epoxy Nanocomposites for Promising EMI Shielding显示文摘In this work,3D highly electrically conductive cellulose nanofibers(CNF)/Ti_(3)C_(2)T_(x) MXene aerogels(CTA)with aligned porous structures are fabricated by directional freezing followed by freeze-drying technique,and the thermally annealed CTA(TCTA)/epoxy nanocomposites are then fabricated by thermal annealing of CTA,subsequent vacuum-assisted impregnation and curing method.Results show that TCTA/epoxy nanocomposites possess 3D highly conductive networks with ultralow percolation threshold of 0.20 vol%Ti_(3)C_(2)T_(x).When the volume fraction of Ti_(3)C_(2)T_(x) is 1.38 vol%,the electrical conductivity(σ),electromagnetic interference shielding effectiveness(EMI SE),and SE divided by thickness(SE/d)values of the TCTA/epoxy nanocomposites reach 1672 Sm-1,74 dB,and 37 dBmm-1,respectively,which are almost the highest values compared to those of polymer nanocomposites reported previously at the same filler content.In addition,compared to those of the samples without Ti_(3)C_(2)T_(x),the storage modulus and heat-resistance index of TCTA/epoxy nanocomposites are enhanced to 9792.5 MPa and 310.7℃,increased by 62%and 6.9℃,respectively,presenting outstanding mechanical properties and thermal stabilities.The fabricated lightweight,easy-to-process,and shapeable TCTA/epoxy nanocomposites with superior EMI SE values,excellent mechanical properties,and thermal stabilities greatly broaden the applications of MXene-based polymer composites in the field of EMI shielding.Lei Wang Ping Song Cheng-Te Lin Jie Kong Junwei Gu 2020Research2020,,1:13
7A novel DOA estimation algorithm using directional antennas in cylindrical conformal arrays显示文摘In this paper, a novel direction of arrival(DOA) estimation algorithm using directional antennas in cylindrical conformal arrays(CCAs) is proposed. To eliminate the shadow effect, we divide the CCAs into several subarrays to obtain the complete output vector. Considering the anisotropic radiation pattern of a CCA, which cannot be separated from the manifold matrix, an improved interpolation method is investigated to transform the directional subarray into omnidirectional virtual nested arrays without non-orthogonal perturbation on the noise vector. Then, the cross-correlation matrix(CCM) of the subarrays is used to generate the consecutive co-arrays without redundant elements and eliminate the noise vector. Finally, the full-rank equivalent covariance matrix is constructed using the output of co-arrays,and the unitary estimation of the signal parameters via rotational invariance techniques(ESPRIT) is performed on the equivalent covariance matrix to estimate the DOAs with low computational complexity. Numerical simulations verify the superior performance of the proposed algorithm, especially under a low signal-to-noise ratio(SNR) environment.Xiao-feng Gao Ping Li Xin-hong Hao Guo-lin Li Zhi-jie Kong 2021Defence Technology(防务技术)2021,17,3:9
8Construction of retroviral vectors to induce a strong expression of human class Ⅰ interferon gene in human hepatocellular carcinoma cells in vitro显示文摘ConstructionofretroviralvectorstoinduceastrongexpresionofhumanclasⅠinterferongeneinhumanhepatocelularcarcinomacelsinvitroCAOG...CAO Guang Wen 1, GAO Jun 1, DU Ping 1, QI Zhong Tian 1 and KONG Xian Tao 2 1997World Journal of Gastroenterology1997,3,3:9
9Long-term eficacy of plasma-derived hepatitis B vaccine among Chinese children:a 12-year folow-up study显示文摘INTRODUCTIONToevaluatelongtermeficacyofaplasmaderivedhepatitisBvaccineandprovideevidencefordecisionmakingonthevaccineboost...LIAO Su Su 1, LI Rong Cheng 2, LI Hui 1, YANG Jin Ye 2, ZENG Xian Jia 1, GONG Jian 2, WANG Shu Sheng 2, LI Yan Ping 2 and ZHANG Kong Lai 1 1999World Journal of Gastroenterology1999,5,2:9
10Multi-sensor measurement and data fusion technology for manufacturing process monitoring:a literature review显示文摘Due to the rapid development of precision manufacturing technology,much research has been conducted in the field of multisensor measurement and data fusion technology with a goal of enhancing monitoring capabilities in terms of measurement accuracy and information richness,thereby improving the efficiency and precision of manufacturing.In a multisensor system,each sensor independently measures certain parameters.Then,the system uses a relevant signalprocessing algorithm to combine all of the independent measurements into a comprehensive set of measurement results.The purpose of this paper is to describe multisensor measurement and data fusion technology and its applications in precision monitoring systems.The architecture of multisensor measurement systems is reviewed,and some implementations in manufacturing systems are presented.In addition to the multisensor measurement system,related data fusion methods and algorithms are summarized.Further perspectives on multisensor monitoring and data fusion technology are included at the end of this paper.Lingbao Kong Xing Peng Yao Chen Ping Wang Min Xu 2020International Journal of Extreme Manufacturing2020,2,2:8
11Pathogenic effects of biofilm with chronic pseudomonas aeruginosa lung infection in rats显示文摘Objective:To establish an animal model of P.aeruginosa biofilm associated with chronic pulmonary infection and investigate the pathogenic effects of biofilm.Methods:Experiments in vitro,measuring the MICS,MBCS of levofloxacin(LFX),ceftazidime(CAZ)in PAO579 in alginate beads and planktonic PAO579.Rats were challenged with 0.1 ml of PAO579(109CFU/ml)in alginate beads or 0.1 ml of planktonic PAO579(109 CFU/ml),3,7,14 days after challenging,bacteriological,pathological features were observed.Results:The MICS,MBCS of LFX,CAZ in PAO579 in alginate beads were higher than those in planktonic PAO579 in vitro.CFU/lung in alginate beads group was significantly higher than that in planktonic bacteria group(P = 0.002,P = 0.004,P = 0.002,respectively);macroscopic lung pathology and the inflammation in alginate beads group were significantly more severe compared to those in planktonic bacteria group in vivo.Conclusion:P.aeruginosa biofilm protected bacterium from killing of antibiotics and might mediate the host immune damage in the lung tissue and made bacterium evade the host immune defense.Ping Yan Yiqiang Chen Zhijun Song Hong Wu Jinliang Kong Xuejun Qin 2008Journal of Nanjing Medical University2008,22,1:7
12Outcomes of simple saline-coupled bipolar electrocautery for hepatic resection显示文摘AIM:To evaluate the application of bipolar coagulation(BIP)in hepatectomy by comparing the efficacy of BIP alone,cavitron ultrasonic surgical aspirator(CUSA)+BIP and conventional clamp crushing(CLAMP).METHODS:Based on our database of patient records,a total of 380 consecutive patients who underwent hepatectomy at our hospital were retrospectively studied for the efficacy of BIP alone,CUSA+BIP and CLAMP.Of all the patients,75 received saline-coupled BIP(Group A),53 received CUSA+BIP(Group B),and252 received CLAMP(Group C).The pre-,mid-,and postoperative clinical manifestations were compared,and the effects of those maneuvers were evaluated.RESULTS:There was no obvious difference among the preoperative indexes between the different groups.The operative time was longer in Groups A and B than in Group C(P<0.001 for both).The amount of bleeding and the rate of transfusion during the operation were significantly higher in Group C than in Groups A and B(P<0.001 for all).The incidence of postoperative complications in Group C(46.43%)was higher than that in Groups A(30.67%,P=0.015)and B(28.30%,P=0.016).The patients’liver function recovery and postoperative hospital stay were not significantly different.BIP could decrease intraoperative hemorrhage and postoperative complications compared to CLAMP.CONCLUSION:Simple saline-coupled BIP should be considered a safe and reliable technique for liver resection to decrease intraoperative hemorrhage and postoperative complications.Jian-Yang Guo De-Wei Li Rui Liao Ping Huang Xian-Bing Kong Ji-Ming Wang Hong-Lin Wang Shi-Qiao Luo Xiong Yan Cheng-You Du 2014World Journal of Gastroenterology2014,20,26:7
13Clinical significance of changes of perioperative T cell and expression of its activated antigen in colorectal cancer patients显示文摘INTRODUCTIONImmunefunctionstatusiscorrespondedtogenesisandprogresoftumor,andcelimmuneplaysamajorroleinantitumorimmunity.Inre...WANG Yi Xing 1, RUAN Can Ping 2, LI Li 3, SHI Jing Hua 2 and KONG Xian Tao 3 1999World Journal of Gastroenterology1999,5,2:6
14Effect of reinforcing kidney-essence, removing phlegm, and promoting mental therapy on treating Alzheimer's disease显示文摘OBJECTIVE: To explore the mechanism of reinforcing kidney-essence, removing phlegm, and promoting mental therapy in treating Alzheimer's disease (AD). METHODS: Sixty patients with AD in Wuhan No.1 Hospital of Traditional Chinese Medicine for Geriatrics from May 2009 to April 2011 were randomly divided into two groups, with 30 in each group. Patients in Bushenhuatanyizhi group (BHY group) took BHY instant granules (6 g, twice per day). Patients in the control group took piracetam (0.8 g, 3 times per day). There were twelve weeks in a course. Changes in the mini-mental state examination (MMSE) score and Activity of Daily Living Scale (ADL) score were analyzed before and after treatment. RESULTS: MMSE scores in the two groups in-creased and ADL scores decreased after treatment, compared with those before treatment (both P< 0.05).The total effective rate was 86.67% in the BHY group (10 very effective, 13 effective, 7 non-responsive). The control group was 57.69% (5 very effective, 16 effective, 9 non-responsive) (P<0.05). Superoxide dismutase levels were increased, lipid peroxide and triglyceride levels decreased after treatment in the BHY group as compared with the control group. CONCLUSION: Reinforcing kidney-essence, removing phlegm, and promoting mental therapy can improve cognitive function and daily life of AD patients. The mechanism of the therapy might be related to improving blood fat, scavenging free radicals, and inhibiting lipid peroxides.Ping Liu Mingwang Kong Songlin Liu Gang Chen Ping Wang 2013Journal of Traditional Chinese Medicine2013,33,4:5
15D-amino acid substitution enhances the stability of antimicrobial peptide polybia-CP显示文摘Fengjing Jia Jiayi Wang Jinxiu Peng Ping Zhao Ziqing Kong Kairong Wang Wenjin Yan Rui Wang 2017Acta Biochimica et Biophysica Sinica2017,49,10:5
16Pedigree tracing of Fenneropenaeus chinensis by microsatellite DNA markers genotyping显示文摘Two microsatellite DNA loci were used to trace the pedigree structure of six families in the shrimp Fenneropenaeus chinensis. Four of the families were natural mating, and the others were mated by artificial insemination. Eleven alleles were acquired at two microsatellite DNA loci (locus RS0622 and locus EN0033) by investigating 145 offsprings and 11 parents. Five alleles were acquired from locus RS0622 and six from locus EN0033. As analyzed, the gene frequencies were between 0.024 1 and 0.493 1, the heterozygosity was 0.652 2 and 0.688 8, and the polymorphism information content (PIC) was 0.585 7 and 0.652 9 for the locus RS0622 and the locus EN0033, respectively. Twenty-three genotypes were detected and the genotypes of the losing parents were also inferred. The pedigrees of three F1 and three F2 generations were determined by matching the genotype at each locus.DONG Shirui KONG Jie ZHANG Qingwem LIU Ping MENG Xianhong WANG Rucai 2006Acta Oceanologica Sinica2006,25,5:5
17Study on purification and ultrastructure of a baculovirus in Penaeus chinensis显示文摘Shi Tuo, Kong Jie, Bao Zhenmin, Liu Ping and Wang Chongming (Huanghai Sea Fisheries Research Institute, Qingdao 266071, China)Liang Xingming, (College of Marine Life Sciences, Ocean University of Qingdao, Qingdao 266003, China) 1998Acta Oceanologica Sinica1998,17,4:4
18The landscape of aging显示文摘Aging is characterized by a progressive deterioration of physiological integrity,leading to impaired functional ability and ultimately increased susceptibility to death.It is a major risk factor for chronic human diseases,including cardiovascular disease,diabetes,neurological degeneration,and cancer.Therefore,the growing emphasis on “healthy aging” raises a series of important questions in life and social sciences.In recent years,there has been unprecedented progress in aging research,particularly the discovery that the rate of aging is at least partly controlled by evolutionarily conserved genetic pathways and biological processes.In an attempt to bring full-fledged understanding to both the aging process and age-associated diseases,we review the descriptive,conceptual,and interventive aspects of the landscape of aging composed of a number of layers at the cellular,tissue,organ,organ system,and organismal levels.Yusheng Cai Wei Song Jiaming Li Ying Jing Chuqian Liang Liyuan Zhang Xia Zhang Wenhui Zhang Beibei Liu Yongpan An Jingyi Li Baixue Tang Siyu Pei Xueying Wu Yuxuan Liu Cheng-Le Zhuang Yilin Ying Xuefeng Dou Yu Chen Fu-Hui Xiao Dingfeng Li Ruici Yang Ya Zhao Yang Wang Lihui Wang Yujing Li Shuai Ma Si Wang Xiaoyuan Song Jie Ren Liang Zhang Jun Wang Weiqi Zhang Zhengwei Xie Jing Qu Jianwei Wang Yichuan Xiao Ye Tian Gelin Wang Ping Hu Jing Ye Yu Sun Zhiyong Mao Qing-Peng Kong Qiang Liu Weiguo Zou Xiao-Li Tian Zhi-Xiong Xiao Yong Liu Jun-Ping Liu Moshi Song Jing-Dong J.Han Guang-Hui Liu 2022Science China(Life Sciences)2022,65,12:4
19A theoretical analysis on efficiency of some Newton-PCG methods显示文摘In this paper, we study the efficiency issue of inexact Newton-type methods for smooth unconstrained optimization problems under standard assumptions from theoretical point of view by discussing a concrete Newton-PCG algorithm. In order to compare the algorithm with Newton's method, a ratio between the measures of their approximate efficiencies is investigated. Under mild conditions, it is shown that first, this ratio is larger than 1, which implies that the Newton-PCG algorithm is more efficient than Newton's method,and second, this ratio increases when the dimension n of the problem increases and tends to infinity at least at a rate ln n/ln 2 when n →∞, which implies that in theory the NewtonPCG algorithm is much more efficient for middle- and large-scale problems. These theoretical results are also supported by our preliminary numerical experiments.DENG Naiyang, ZHANG Jianzhong & ZHONG Ping China Agricultural University, Beijing 100083, China City University of Hong Kong, Hong Kong, China 2005Science China Mathematics2005,48,8:4
20Heterosis and heritability estimates for the survival of the Pacific white shrimp(Litopenaeus vannamei) under the commercial scale ponds显示文摘The aim of the present study is to detect the potential of the base population from diallel crosses of eight introduced strains of the Pacific white shrimp(Litopenaeus vannamei) for improving the yield. Heterosis and heritability were estimated for pond survival at commercial farm conditions for the base population that included 207 full-sib families from a nested mating design by artificial insemination. Among all the hybrids,the heterosis ranged from –11.37%(UA1×UA2) to 20.53%(UA3×SIN) with an average of 0.953%. The results showed that more than half of the hybrids(51.85%) have negative heterosis for survival rate, but most of the hybrids with positive heterosis have high estimates. The high proportion of negative heterosis for survival rate reminders us that the survival trait also should be considered in the crossbreeding program to avoid yield decrease. However, high positive heterosis manifested in most of the hybrids for survival indicates the usefulness of these hybrids for improving the survival to obtain higher yield by crossbreeding in this breeding program. The heritability estimate for pond survival was 0.092±0.043 when genetic groups were included in the pedigree, and it was significantly different from zero(P<0.05). The results from this study also indicated that significant improvement for survival is possible through selection in L. vannamei.LU Xia LUAN Sheng CAO Baoxiang SUI Juan DAI Ping MENG Xianhong LUO Kun KONG Jie 2017Acta Oceanologica Sinica2017,36,2:4
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