Background It has been reported that increased red blood cell width （RDW）is a marker associated with the presence and adverse outcomes of various cardiovascular diseases. The aim of the present study was prospective...Background It has been reported that increased red blood cell width （RDW）is a marker associated with the presence and adverse outcomes of various cardiovascular diseases. The aim of the present study was prospectively evaluate the severity of coronary artery disease （CAD） and RDW in a large Chinese cohort. Methods A total of 677 consecutive individuals who underwent coronary angiography due to the presence of angina-like chest pain and/or positive treadmill exercise test were enrolled in this study. All patients received coronary angiography and were then divided into two groups based on the results of coronary angiography （CAD group （n=499） and control group （n=178））. The clinical information including classical CAD risk factors and RDW were analyzed to identify their relationship to CAD. The severity of CAD was evaluated by Gensini score and its relationship with RDW was also analyzed. Results Patients with angiographic CAD had significantly elevated RDW levels compared with controls （（12.95±0.77）% vs. （12.73±0.83）%, P=-0.001）. There was a significant positive correlation between RDW and the Gensini score （t=0.37, P 〈0.001）. In multivariate Logistic regression analysis, RDW was demonstrated to be an independent predictor for both angiographic CAD （OR=1.34, 95% Cl 1.02-1.77, P 〈0.05） and for a higher Gensini score （〉13, OR=-2.23, 95% Cf.. 1.62-3.08, P 〈0.001）. In a receiver operating characteristic （ROC） curve analysis, an RDW value of 12.85% was identified as an effective cut-point in predicting the presence or absence of CAD with a sensitivity of 50.0% and a specificity of 65.2%. Conclusion RDW is associated with both presence of CAD and the severity of coronary stenosis, suggesting that it might be a readily available marker for the prediction of CAD and its severity.展开更多
Nitrogen(N)is a critical element for plant growth and productivity that influences photosynthesis and chlorophyll fluorescence.We investigated the effect of low-N stress on leaf photosynthesis and chlorophyll fluoresc...Nitrogen(N)is a critical element for plant growth and productivity that influences photosynthesis and chlorophyll fluorescence.We investigated the effect of low-N stress on leaf photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with difference in tolerance to low N levels.The low-N tolerant cultivar ZH311 and low-N sensitive cultivar XY508 were used as the test materials.A field experiment(with three N levels:N0,0 kg ha–1;N1,150 kg ha–1;N2,300 kg ha–1)in Jiyanyang,Sichuan Province,China,and a hydroponic experiment(with two N levels:CK,4 mmol L–1;LN,0.04 mmol L–1)in Chengdu,Sichuan Province,China were conducted.Low-N stress significantly decreased chlorophyll content and rapid light response curves of the maximum fluorescence under light(Fm′),fluorescence instable state(Fs),non-photochemical quenching(qN),the maximum efficiency of PSII photochemistry under dark-adaption(Fv/Fm),potential activity of PSII(Fv/Fo),and actual photochemical efficiency of PSII(ΦPSII)of leaves.Further,it increased the chlorophyll(Chl)a/Chl b values and so on.The light compensation point of ZH311 decreased,while that of XY508 increased.The degree of variation of these indices in low-N tolerant cultivars was lower than that in low-N sensitive cultivars,especially at the seedling stage.Maize could increase Chl a/Chl b,apparent quantum yield and light saturation point to adapt to N stress.Compared to low-N sensitive cultivars,low-N tolerant cultivars maintained a higher net photosynthetic rate and electron transport rate to maintain stronger PSII activity,which further promoted the ability to harvest and transfer light.This might be a photosynthetic mechanism by which low-N tolerant cultivar adapt to low-N stress.展开更多
Background：No national research on maternal and fetal complications and outcomes has been carried out in the mainland of China in recent years.This study was to provide a scientific basis for better control of obstet...Background：No national research on maternal and fetal complications and outcomes has been carried out in the mainland of China in recent years.This study was to provide a scientific basis for better control of obstetrical and neonatal diseases and better allocation of medical resources by analyzing the epidemiological characteristics of obstetrical diseases in the mainland of China.Methods：Hospitalized obstetrical cases from 19 tertiary and 20 secondary hospitals in 14 provinces （nationally representative） during the period January 1,2011 to December 31,2011 were randomly selected.The general condition,pregnancy complications,and perinatal outcomes of the patients were studied.Results：The top five medical and surgical complications of pregnant women in the mainland of China were anemia （6.34％）,uterine fibroids （2.69％）,thyroid disease （1.11％）,thrombocytopenia （0.59％）,and heart disease （0.59％）.The incidences of premature rupture of membranes （PROM）,preterm birth,prolonged pregnancy,hypertensive disorders complicating pregnancy （HDCP）,multiple pregnancy,intrahepatic cholestasis of pregnancy （ICP）,placenta previa,placental abruption,postpartum hemorrhage,and amniotic fluid embolism were 15.27％,7.04％,6.71％,5.35％,1.57％,1.22％,1.14％,0.54％,3.26％ and 0.06％,respectively.The incidences of anemia and prolonged pregnancy were significantly lower in tertiary than secondary hospitals （P ＜ 0.001）,whereas the incidence of uterine fibroids,thyroid diseases,thrombocytopenia,heart disease,PROM,preterm birth,HDCP,multiple pregnancy,ICP,placenta previa,and placental abruption were significantly higher in tertiary than secondary hospitals （P ＜ 0.001）.The cesarean section （CS） rate was 54.77％.The newborn sex ratio was 119：100,and 1.03％ of the neonates were malformed.The percentages of low birth weight and fetal macrosomia in full-term babies were 2.10％ and 7.09％,respectively.Conclusions：The incidence of some obstetrical diseases is still h展开更多
AIM To assess disease-specific circulating micro RNAs(mi RNAs) in non-alcoholic steatohepatitis(NASH) patients.METHODS A total of 111 biopsy-proven non-alcoholic fatty liver disease(NAFLD) or chronic hepatitis B(CHB) ...AIM To assess disease-specific circulating micro RNAs(mi RNAs) in non-alcoholic steatohepatitis(NASH) patients.METHODS A total of 111 biopsy-proven non-alcoholic fatty liver disease(NAFLD) or chronic hepatitis B(CHB) patients and healthy controls from China's Mainland were enrolled to measure their serum levels of mi R-122,-125 b,-146 b,-16,-21,-192,-27 b and-34 a. The correlations between serum mi RNAs and histological features of NAFLD were determined. The diagnostic value of mi RNA in NASH and significant fibrosis was analyzed and compared with that of cytokeratin-18(CK-18), fibrosis-4(FIB-4), and aspartate aminotransferase to platelet ratio index(APRI), respectively.RESULTS Circulating mi R-122,-16,-192 and-34 a showed differential expression levels between NAFLD and CHB patients, and mi R-34 a had an approximately 2-fold increase in NAFLD samples compared with that of CHB samples(P < 0.01). Serum mi R-122,-192 and-34a levels were correlated with steatosis(R = 0.302, 0.323 and 0.470, respectively, P < 0.05) and inflammatory activity(R = 0.445, 0.447 and 0.517, respectively, P < 0.01); only serum mi R-16 levels were associated with fibrosis(R = 0.350, P < 0.05) in patients with NAFLD. The diagnostic value of mi R-34 a for NASH(area under the receiver operating characteristic, 0.811, 95%CI: 0.670-0.953) was superior to that of alanine aminotransferase, CK-18, FIB-4 and APRI in NAFLD, but mi R-16 showed a limited performance in the diagnosis of significant fibrosis in NASH.CONCLUSION Circulating mi R-34 a may serve as a disease-specific noninvasive biomarker for the diagnosis of NASH.展开更多
AIM: To identify a molecular marker for gastric cancer, andto investigate the relationship between the polymorphismof pepsinogen C (PGC) gene and the genetic predispositionto gastric cancer.METHODS: A total of 289 cas...AIM: To identify a molecular marker for gastric cancer, andto investigate the relationship between the polymorphismof pepsinogen C (PGC) gene and the genetic predispositionto gastric cancer.METHODS: A total of 289 cases were involved in this study.115 cases came from Shenyang area, a low risk area ofgastric cancer, including 42 unrelated controls and 73 patientswith gastric cancer. 174 cases came from Zhuanghe area, ahigh-risk area of gastric cancer, including 113 unrelatedcontrols, and 61 cases from gastric cancer kindred families.The polymorphism of PGC gene was detected by polymerasechain reaction (PCR) and the relation between the geneticpolymorphism of PGC and gastric cancer was examined.RESULTS: Four alleles, 310bp (allele 1), 400bp (allele 2),450bp (allele 3), and 480bp (allele 4) were detected byPCR. The frequency of allele 1 was higher in patients withgastric cancer than that in controls. Genotypes containinghomogenous allele 1 were significantly more frequent inpatients with gastric cancerthan that in controls (0.33, 0.14,x2＝3.86, P＜0.05). There was no significant differencebetween the control group of Zhuanghe and the group ofgastric cancer kindred. But the frequency of allele 1 washigher in control group of Zhuanghe area than that in controlgroup of Shenyang area and genotypes containinghomogenous allele 1 were significantly more frequent inthe control group of Zhuanghe area than those in controlgroup of Shenyang area (0.33, 0.14, x2＝4.32, P＜0.05). Inthe group of gastric cancer kindred the frequency of allele 1was significantly higher than that in control group ofShenyang area (0.5164, 0.3571, x2＝4.47, P＜0.05).Genotypes containing homogenous allele 1 were significantlymore frequent in the group of gastric cancer kindred thanthose in control group of Shenyang area (0.36, 0.14, x2＝4.91,P＜0.05).CONCLUSION: These results suggest that there is somerelation between pepsinogen C gene polymorphism andgastric cancer, and the person with homogenous allele 1predisposes to gastric cancer than thos展开更多
利用不同氮肥用量田间试验,分析基于无人机平台的可见光谱诊断技术对烟草氮素营养进行无损评估预测的可行性,明确该技术的最佳颜色参数和方程模型。2018年在江西省安福县开展田间试验,设置不同氮肥用量,分别为0,45,90,135,180和300 kg N...利用不同氮肥用量田间试验,分析基于无人机平台的可见光谱诊断技术对烟草氮素营养进行无损评估预测的可行性,明确该技术的最佳颜色参数和方程模型。2018年在江西省安福县开展田间试验,设置不同氮肥用量,分别为0,45,90,135,180和300 kg N·ha^-1,于移栽后47 d(团棵期)、移栽后83 d(旺长后期)和移栽后116 d(下部叶成熟期),利用无人机获取冠层RGB色彩数字图像,同时采集植株样品分析地上部生物量、叶片生物量、地上部氮浓度、叶片氮浓度、叶片SPAD值等氮营养状况指标,对冠层数字图像进行数字化分析,获得颜色指标值,通过颜色指标与烟草氮营养状况指标的相关性分析,筛选适宜的颜色指标并建立氮营养诊断方程。利用不同地块的氮肥用量试验,对氮营养诊断方程拟合精度进行验证。试验结果表明,旺长后期各处理间冠层图像的颜色标准值存在显著差异,团棵期与下部叶成熟期不存在显著差异。在10个颜色指标中,NRI,NGI,G/R,G/(R+B),(G-R)/(R+G+B)和ExG与5个烤烟氮素营养指标均达到极显著相关(p<0.01)。在归一化颜色指标体系、比颜色指标体系和归一化差分颜色指标体系中选择潜在的最佳颜色参数指标分别为NGI,G/R和ExG。根据不同类型的回归分析结果,确定指数回归作为地上部生物量和叶片生物量的预测模型,线性回归作为地上部氮浓度、叶片氮浓度及叶片SPAD值的预测模型。对潜在的最佳指标进行验证性筛选,G/R对地上部氮浓度和叶片氮浓度的RMSE值分别为0.3751%和0.2491%,明显低于NGI和ExG,预测精度最高。用G/R值表示的地上部生物量、叶片生物量、地上部氮浓度、叶片氮浓度、SPAD值预测方程分别为Y=21.785e 1.3502G/R,Y=4.0579e 1.9373G/R,Y=5.0399G/R-3.3332,Y=4.2814G/R-3.8029,Y=40.168G/R-28.188。因此,基于无人机平台的可见光谱诊断技术在烤烟氮素营养诊断方面具有应用潜力,评估最佳时期为�展开更多
文摘Background It has been reported that increased red blood cell width （RDW）is a marker associated with the presence and adverse outcomes of various cardiovascular diseases. The aim of the present study was prospectively evaluate the severity of coronary artery disease （CAD） and RDW in a large Chinese cohort. Methods A total of 677 consecutive individuals who underwent coronary angiography due to the presence of angina-like chest pain and/or positive treadmill exercise test were enrolled in this study. All patients received coronary angiography and were then divided into two groups based on the results of coronary angiography （CAD group （n=499） and control group （n=178））. The clinical information including classical CAD risk factors and RDW were analyzed to identify their relationship to CAD. The severity of CAD was evaluated by Gensini score and its relationship with RDW was also analyzed. Results Patients with angiographic CAD had significantly elevated RDW levels compared with controls （（12.95±0.77）% vs. （12.73±0.83）%, P=-0.001）. There was a significant positive correlation between RDW and the Gensini score （t=0.37, P 〈0.001）. In multivariate Logistic regression analysis, RDW was demonstrated to be an independent predictor for both angiographic CAD （OR=1.34, 95% Cl 1.02-1.77, P 〈0.05） and for a higher Gensini score （〉13, OR=-2.23, 95% Cf.. 1.62-3.08, P 〈0.001）. In a receiver operating characteristic （ROC） curve analysis, an RDW value of 12.85% was identified as an effective cut-point in predicting the presence or absence of CAD with a sensitivity of 50.0% and a specificity of 65.2%. Conclusion RDW is associated with both presence of CAD and the severity of coronary stenosis, suggesting that it might be a readily available marker for the prediction of CAD and its severity.
基金financially supported by the Sichuan Key Technology Support Program of China (2014NZ0040)the Special Fund for Agro-scientific Research in the Public Interest of China (20150312705)
文摘Nitrogen(N)is a critical element for plant growth and productivity that influences photosynthesis and chlorophyll fluorescence.We investigated the effect of low-N stress on leaf photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with difference in tolerance to low N levels.The low-N tolerant cultivar ZH311 and low-N sensitive cultivar XY508 were used as the test materials.A field experiment(with three N levels:N0,0 kg ha–1;N1,150 kg ha–1;N2,300 kg ha–1)in Jiyanyang,Sichuan Province,China,and a hydroponic experiment(with two N levels:CK,4 mmol L–1;LN,0.04 mmol L–1)in Chengdu,Sichuan Province,China were conducted.Low-N stress significantly decreased chlorophyll content and rapid light response curves of the maximum fluorescence under light(Fm′),fluorescence instable state(Fs),non-photochemical quenching(qN),the maximum efficiency of PSII photochemistry under dark-adaption(Fv/Fm),potential activity of PSII(Fv/Fo),and actual photochemical efficiency of PSII(ΦPSII)of leaves.Further,it increased the chlorophyll(Chl)a/Chl b values and so on.The light compensation point of ZH311 decreased,while that of XY508 increased.The degree of variation of these indices in low-N tolerant cultivars was lower than that in low-N sensitive cultivars,especially at the seedling stage.Maize could increase Chl a/Chl b,apparent quantum yield and light saturation point to adapt to N stress.Compared to low-N sensitive cultivars,low-N tolerant cultivars maintained a higher net photosynthetic rate and electron transport rate to maintain stronger PSII activity,which further promoted the ability to harvest and transfer light.This might be a photosynthetic mechanism by which low-N tolerant cultivar adapt to low-N stress.
文摘Background：No national research on maternal and fetal complications and outcomes has been carried out in the mainland of China in recent years.This study was to provide a scientific basis for better control of obstetrical and neonatal diseases and better allocation of medical resources by analyzing the epidemiological characteristics of obstetrical diseases in the mainland of China.Methods：Hospitalized obstetrical cases from 19 tertiary and 20 secondary hospitals in 14 provinces （nationally representative） during the period January 1,2011 to December 31,2011 were randomly selected.The general condition,pregnancy complications,and perinatal outcomes of the patients were studied.Results：The top five medical and surgical complications of pregnant women in the mainland of China were anemia （6.34％）,uterine fibroids （2.69％）,thyroid disease （1.11％）,thrombocytopenia （0.59％）,and heart disease （0.59％）.The incidences of premature rupture of membranes （PROM）,preterm birth,prolonged pregnancy,hypertensive disorders complicating pregnancy （HDCP）,multiple pregnancy,intrahepatic cholestasis of pregnancy （ICP）,placenta previa,placental abruption,postpartum hemorrhage,and amniotic fluid embolism were 15.27％,7.04％,6.71％,5.35％,1.57％,1.22％,1.14％,0.54％,3.26％ and 0.06％,respectively.The incidences of anemia and prolonged pregnancy were significantly lower in tertiary than secondary hospitals （P ＜ 0.001）,whereas the incidence of uterine fibroids,thyroid diseases,thrombocytopenia,heart disease,PROM,preterm birth,HDCP,multiple pregnancy,ICP,placenta previa,and placental abruption were significantly higher in tertiary than secondary hospitals （P ＜ 0.001）.The cesarean section （CS） rate was 54.77％.The newborn sex ratio was 119：100,and 1.03％ of the neonates were malformed.The percentages of low birth weight and fetal macrosomia in full-term babies were 2.10％ and 7.09％,respectively.Conclusions：The incidence of some obstetrical diseases is still h
基金Supported by grants from the State Key Development Program for Basic Research of China,No.2012CB517501National Natural Science Foundation of China,No.81270491 and No.81470840+1 种基金Hundred Talents Program of the Shanghai Board of Health,No.XBR2011007Program of the Shanghai Committee of Science and Technology,No.10411956300
文摘AIM To assess disease-specific circulating micro RNAs(mi RNAs) in non-alcoholic steatohepatitis(NASH) patients.METHODS A total of 111 biopsy-proven non-alcoholic fatty liver disease(NAFLD) or chronic hepatitis B(CHB) patients and healthy controls from China's Mainland were enrolled to measure their serum levels of mi R-122,-125 b,-146 b,-16,-21,-192,-27 b and-34 a. The correlations between serum mi RNAs and histological features of NAFLD were determined. The diagnostic value of mi RNA in NASH and significant fibrosis was analyzed and compared with that of cytokeratin-18(CK-18), fibrosis-4(FIB-4), and aspartate aminotransferase to platelet ratio index(APRI), respectively.RESULTS Circulating mi R-122,-16,-192 and-34 a showed differential expression levels between NAFLD and CHB patients, and mi R-34 a had an approximately 2-fold increase in NAFLD samples compared with that of CHB samples(P < 0.01). Serum mi R-122,-192 and-34a levels were correlated with steatosis(R = 0.302, 0.323 and 0.470, respectively, P < 0.05) and inflammatory activity(R = 0.445, 0.447 and 0.517, respectively, P < 0.01); only serum mi R-16 levels were associated with fibrosis(R = 0.350, P < 0.05) in patients with NAFLD. The diagnostic value of mi R-34 a for NASH(area under the receiver operating characteristic, 0.811, 95%CI: 0.670-0.953) was superior to that of alanine aminotransferase, CK-18, FIB-4 and APRI in NAFLD, but mi R-16 showed a limited performance in the diagnosis of significant fibrosis in NASH.CONCLUSION Circulating mi R-34 a may serve as a disease-specific noninvasive biomarker for the diagnosis of NASH.
基金The National Basic Research Program(973)of China, No.G1998051203National Natural Science Foundation of China,No.30171054
文摘AIM: To identify a molecular marker for gastric cancer, andto investigate the relationship between the polymorphismof pepsinogen C (PGC) gene and the genetic predispositionto gastric cancer.METHODS: A total of 289 cases were involved in this study.115 cases came from Shenyang area, a low risk area ofgastric cancer, including 42 unrelated controls and 73 patientswith gastric cancer. 174 cases came from Zhuanghe area, ahigh-risk area of gastric cancer, including 113 unrelatedcontrols, and 61 cases from gastric cancer kindred families.The polymorphism of PGC gene was detected by polymerasechain reaction (PCR) and the relation between the geneticpolymorphism of PGC and gastric cancer was examined.RESULTS: Four alleles, 310bp (allele 1), 400bp (allele 2),450bp (allele 3), and 480bp (allele 4) were detected byPCR. The frequency of allele 1 was higher in patients withgastric cancer than that in controls. Genotypes containinghomogenous allele 1 were significantly more frequent inpatients with gastric cancerthan that in controls (0.33, 0.14,x2＝3.86, P＜0.05). There was no significant differencebetween the control group of Zhuanghe and the group ofgastric cancer kindred. But the frequency of allele 1 washigher in control group of Zhuanghe area than that in controlgroup of Shenyang area and genotypes containinghomogenous allele 1 were significantly more frequent inthe control group of Zhuanghe area than those in controlgroup of Shenyang area (0.33, 0.14, x2＝4.32, P＜0.05). Inthe group of gastric cancer kindred the frequency of allele 1was significantly higher than that in control group ofShenyang area (0.5164, 0.3571, x2＝4.47, P＜0.05).Genotypes containing homogenous allele 1 were significantlymore frequent in the group of gastric cancer kindred thanthose in control group of Shenyang area (0.36, 0.14, x2＝4.91,P＜0.05).CONCLUSION: These results suggest that there is somerelation between pepsinogen C gene polymorphism andgastric cancer, and the person with homogenous allele 1predisposes to gastric cancer than thos
