为探究减氮配施有机肥对机插杂交稻产量形成及其相关特性的影响,本研究以籼型杂交稻F优498为材料,采用二因素裂区设计,主区设不施有机肥(Mo)和施有机肥(Mc,有机肥1500 kg hm^(–2))2种施肥方式;副区为减氮处理,在常规施化学氮肥180 kg h...为探究减氮配施有机肥对机插杂交稻产量形成及其相关特性的影响,本研究以籼型杂交稻F优498为材料,采用二因素裂区设计,主区设不施有机肥(Mo)和施有机肥(Mc,有机肥1500 kg hm^(–2))2种施肥方式;副区为减氮处理,在常规施化学氮肥180 kg hm^(–2)(N_(3),CK)的基础上,设置减氮25%(N_(2))、减氮50%(N_(1))和不施氮肥(N_(0))4个施氮水平,通过测定产量、光合特性、干物质积累、氮素转运及利用效率等指标,明确减氮配施有机肥的协同增效机制。结果显示,与Mo相比,Mc处理提高了光合叶面积指数和光合势,叶绿素含量下降速率减缓,有效延缓叶片衰老,提高光合能力。适量减氮配施有机肥能够优化群体构成,有效穗数、穗粒数及千粒重显著提升,配施有机肥下减氮25%(McN_(2))处理产量最高,2年平均较单施化肥(MoN_(3))增产6.04%。减氮配施有机肥处理下,成熟期干物质积累量与氮素积累量均表现为N_(2)>N_(3)>N_(1)>N_(0)。同时,与MoN_(3)相比,McN_(2)的氮素干物质生产效率、氮肥表观利用率、生理利用率、氮肥农学利用率、氮肥偏生产力均有所提高。表明,减氮25%配施有机肥通过协同优化物质积累分配与氮素高效转运,来提升光合产物向籽粒的定向供应能力,构建“足源大库”群体,实现机插稻高产与氮肥高效利用的平衡,为绿色丰产栽培提供了理论支撑。展开更多
This study presents a comprehensive analysis of 132 tornadic events in northeastern China from 2004 to 2023,utilizing radar and ERA5 reanalysis data to investigate the climatology,environmental drivers,and synoptic li...This study presents a comprehensive analysis of 132 tornadic events in northeastern China from 2004 to 2023,utilizing radar and ERA5 reanalysis data to investigate the climatology,environmental drivers,and synoptic linkages with Northeast China cold vortices(NCCVs)of tornadic storms under different convective modes.Results reveal that discrete storms account for 70%of events,with clustered cells(CC)being the most frequent mode,while significant tornadoes(EF2+)are primarily associated with isolated cells(IC)and broken lines(BL).The storm mode distribution in northeastern China resembles that of the central United States but with a higher proportion of CC and lower IC.In contrast,southern China exhibits a higher frequency of quasi-linear(QL)modes(>50%),similar to European patterns.Although no single parameter clearly differentiates between all tornado modes,distinct morphological characteristics emerge through specific parameter combinations:NL modes are characterized by high 0-1 km storm-relative helicity(SRH1)and humidity but low 0-6 km shear(SR6),whereas IC modes display contrasting features with low SRH1 and high CAPE.Notably,83%of tornadoes are associated with NCCVs,preferentially forming in southeastern/southwestern quadrants.Strong tornadoes favor southeastern quadrants,while NCCV intensity correlates with tornadic distance from vortex centers.Three characteristic synoptic configurations emerge:(T1)strong deep vortices with vertically aligned cold troughs,generating southeast-dominant tornado clusters characterized by a high proportion of BL and QL modes;(T2)weaker vortices featuring sub-synoptic troughs,with southern-distributed events dominated by a predominance of the CC mode;(T3)transverse-trough systems exhibiting CAPE-SRH decoupling and reduced tornadic activity.This study enhances our understanding of tornadoes in northeastern China,informing future research on formation mechanisms,prediction methods,and disaster prevention strategies.展开更多
BACKGROUND There is a lack of clinical evidence on the efficacy and safety of transitioning from a thrice-daily pre-mixed insulin or basal-prandial regimen to insulin degludec/aspart(IDegAsp)therapy,with insufficient ...BACKGROUND There is a lack of clinical evidence on the efficacy and safety of transitioning from a thrice-daily pre-mixed insulin or basal-prandial regimen to insulin degludec/aspart(IDegAsp)therapy,with insufficient data from the Chinese population.AIM To demonstrate the efficacy,safety,and treatment satisfaction associated with the transition to IDegAsp in type 2 diabetes mellitus(T2DM).METHODS In this 12-week open-label,non-randomized,single-center,pilot study,patients with T2DM receiving thrice-daily insulin or intensive insulin treatment were transitioned to twice-daily injections of insulin IDegAsp.Insulin doses,hemoglobin A1c(HbA1c)levels,fasting blood glucose(FBG),hypoglycemic events,a Diabetes Treatment Satisfaction Questionnaire,and other parameters were assessed at baseline and 12-weeks.RESULTS This study included 21 participants.A marked enhancement was observed in the FBG level(P=0.02),daily total insulin dose(P=0.03),and overall diabetes treatment satisfaction(P<0.01)in the participants who switched to IDegAsp.There was a decrease in HbA1c levels(7.6±1.1 vs 7.4±0.9,P=0.31)and the frequency of hypoglycemic events of those who switched to IDegAsp decreased,however,there was no statistically significant difference.CONCLUSION The present findings suggest that treatment with IDegAsp enhances clinical outcomes,particularly FBG levels,daily cumulative insulin dose,and overall satisfaction with diabetes treatment.展开更多
BACKGROUND Gastroparesis may repeatedly induce diabetic ketoacidosis(DKA),and the differential diagnosis of these diseases is challenging because of similar gastrointestinal symptoms.If DKA is accompanied by gastropar...BACKGROUND Gastroparesis may repeatedly induce diabetic ketoacidosis(DKA),and the differential diagnosis of these diseases is challenging because of similar gastrointestinal symptoms.If DKA is accompanied by gastroparesis,patients present with persistent gastrointestinal symptoms without relief and may even experience recurrent DKA.Misdiagnosis results in poor treatment outcomes and prognosis.We hypothesized that biomarkers or screening tools can be identified by comparing the clinical data between DKA alone and DKA+gastroparesis to facilitate early screening.AIM To achieve early detection and diagnosis of DKA+gastroparesis to enable early treatment aimed at relieving gastrointestinal symptoms and preventing reinduction of DKA.METHODS We conducted a case-control study in which 15 patients hospitalized for DKA at the Endocrinology Department of Peking Union Medical College Hospital and diagnosed with DKA and gastroparesis between December 1999 and January 2023(DKA+gastroparesis group)were included.Then,we selected 60 DKA patients without DKA as a control group(DKA alone group)based on gender,age,disease course,and diabetes subtype in a 1:4 matching ratio.Clinical manifestations and physical and laboratory examination results were statistically compared between the groups.RESULTS The DKA+gastroparesis group was composed of nine males and six females,with a mean age of 35±11 years,while the DKA alone group included 34 males and 26 females,with a mean age of 34±17 years.In the DKA+gastroparesis group,urine ketone levels normalized,while gastrointestinal symptoms persisted despite treatment,and the tests indicated lower glycosylated hemoglobin levels(HbA1c;7.07%vs 11.51%,P<0.01),largest amplitude of glycemic excursions(5.86 vs 17.41,P<0.01),standard deviation of blood glucose(SDBG;2.69 vs 5.83,P<0.01),and coefficient of blood glucose variation(0.31 vs 0.55,P=0.014)compared with the DKA alone group.Probable gastroparesis was considered at HbA1c<8.55%.Besides,the patients in the DKA+gastroparesis group had lower body mass index(19.28 kg/m^(2) vs 23.86 kg/m^(2),P=0.02)and higher high density lipoprotein cholesterol level(2.34 mmol/L vs 1.05 mmol/L,P=0.019)compared to the DKA alone group,but no difference was observed in the remaining lipid profiles between the two groups.CONCLUSION Gastroparesis should be considered in DKA patients who fail to have improved gastrointestinal symptoms after ketone elimination and acidosis correction,particularly when the HbA1c level is<8.55%.展开更多
文摘为探究减氮配施有机肥对机插杂交稻产量形成及其相关特性的影响,本研究以籼型杂交稻F优498为材料,采用二因素裂区设计,主区设不施有机肥(Mo)和施有机肥(Mc,有机肥1500 kg hm^(–2))2种施肥方式;副区为减氮处理,在常规施化学氮肥180 kg hm^(–2)(N_(3),CK)的基础上,设置减氮25%(N_(2))、减氮50%(N_(1))和不施氮肥(N_(0))4个施氮水平,通过测定产量、光合特性、干物质积累、氮素转运及利用效率等指标,明确减氮配施有机肥的协同增效机制。结果显示,与Mo相比,Mc处理提高了光合叶面积指数和光合势,叶绿素含量下降速率减缓,有效延缓叶片衰老,提高光合能力。适量减氮配施有机肥能够优化群体构成,有效穗数、穗粒数及千粒重显著提升,配施有机肥下减氮25%(McN_(2))处理产量最高,2年平均较单施化肥(MoN_(3))增产6.04%。减氮配施有机肥处理下,成熟期干物质积累量与氮素积累量均表现为N_(2)>N_(3)>N_(1)>N_(0)。同时,与MoN_(3)相比,McN_(2)的氮素干物质生产效率、氮肥表观利用率、生理利用率、氮肥农学利用率、氮肥偏生产力均有所提高。表明,减氮25%配施有机肥通过协同优化物质积累分配与氮素高效转运,来提升光合产物向籽粒的定向供应能力,构建“足源大库”群体,实现机插稻高产与氮肥高效利用的平衡,为绿色丰产栽培提供了理论支撑。
基金supported by the National Natural Science Foundation of China(Grant No.42305013)Joint Research Project for Meteorological Capacity Improvement(Grant Nos.23NLTSQ002 and 24NLTSQ001)+2 种基金China Meteorological Administration Tornado Key Laboratory(Grant No.TKL202307)the China Meteorological Administration Youth Innovation Team Fund(Grant No.CMA2024QN05)a research project of the Chinese Academy of Meteorological Science(Grant No.2023Z019)。
文摘This study presents a comprehensive analysis of 132 tornadic events in northeastern China from 2004 to 2023,utilizing radar and ERA5 reanalysis data to investigate the climatology,environmental drivers,and synoptic linkages with Northeast China cold vortices(NCCVs)of tornadic storms under different convective modes.Results reveal that discrete storms account for 70%of events,with clustered cells(CC)being the most frequent mode,while significant tornadoes(EF2+)are primarily associated with isolated cells(IC)and broken lines(BL).The storm mode distribution in northeastern China resembles that of the central United States but with a higher proportion of CC and lower IC.In contrast,southern China exhibits a higher frequency of quasi-linear(QL)modes(>50%),similar to European patterns.Although no single parameter clearly differentiates between all tornado modes,distinct morphological characteristics emerge through specific parameter combinations:NL modes are characterized by high 0-1 km storm-relative helicity(SRH1)and humidity but low 0-6 km shear(SR6),whereas IC modes display contrasting features with low SRH1 and high CAPE.Notably,83%of tornadoes are associated with NCCVs,preferentially forming in southeastern/southwestern quadrants.Strong tornadoes favor southeastern quadrants,while NCCV intensity correlates with tornadic distance from vortex centers.Three characteristic synoptic configurations emerge:(T1)strong deep vortices with vertically aligned cold troughs,generating southeast-dominant tornado clusters characterized by a high proportion of BL and QL modes;(T2)weaker vortices featuring sub-synoptic troughs,with southern-distributed events dominated by a predominance of the CC mode;(T3)transverse-trough systems exhibiting CAPE-SRH decoupling and reduced tornadic activity.This study enhances our understanding of tornadoes in northeastern China,informing future research on formation mechanisms,prediction methods,and disaster prevention strategies.
基金Supported by CAMS Innovation Fund for Medical Sciences,No.2023-I2M-C&T-B-043National High Level Hospital Clinical Research Funding,No.2022-PUMCH-B-015+1 种基金CAMS Innovation Fund for Medical Sciences,No.2021-1-12M-002Beijing Municipal Natural Science Foundation,No.M22014.
文摘BACKGROUND There is a lack of clinical evidence on the efficacy and safety of transitioning from a thrice-daily pre-mixed insulin or basal-prandial regimen to insulin degludec/aspart(IDegAsp)therapy,with insufficient data from the Chinese population.AIM To demonstrate the efficacy,safety,and treatment satisfaction associated with the transition to IDegAsp in type 2 diabetes mellitus(T2DM).METHODS In this 12-week open-label,non-randomized,single-center,pilot study,patients with T2DM receiving thrice-daily insulin or intensive insulin treatment were transitioned to twice-daily injections of insulin IDegAsp.Insulin doses,hemoglobin A1c(HbA1c)levels,fasting blood glucose(FBG),hypoglycemic events,a Diabetes Treatment Satisfaction Questionnaire,and other parameters were assessed at baseline and 12-weeks.RESULTS This study included 21 participants.A marked enhancement was observed in the FBG level(P=0.02),daily total insulin dose(P=0.03),and overall diabetes treatment satisfaction(P<0.01)in the participants who switched to IDegAsp.There was a decrease in HbA1c levels(7.6±1.1 vs 7.4±0.9,P=0.31)and the frequency of hypoglycemic events of those who switched to IDegAsp decreased,however,there was no statistically significant difference.CONCLUSION The present findings suggest that treatment with IDegAsp enhances clinical outcomes,particularly FBG levels,daily cumulative insulin dose,and overall satisfaction with diabetes treatment.
基金Supported by National High Level Hospital Clinical Research Funding,No.2022-PUMCH-B-015the Chinese Academy of Medical Sciences(CAMS)Innovation Fund for Medical Sciences,No.2021-I2M-C&T-B-003.
文摘BACKGROUND Gastroparesis may repeatedly induce diabetic ketoacidosis(DKA),and the differential diagnosis of these diseases is challenging because of similar gastrointestinal symptoms.If DKA is accompanied by gastroparesis,patients present with persistent gastrointestinal symptoms without relief and may even experience recurrent DKA.Misdiagnosis results in poor treatment outcomes and prognosis.We hypothesized that biomarkers or screening tools can be identified by comparing the clinical data between DKA alone and DKA+gastroparesis to facilitate early screening.AIM To achieve early detection and diagnosis of DKA+gastroparesis to enable early treatment aimed at relieving gastrointestinal symptoms and preventing reinduction of DKA.METHODS We conducted a case-control study in which 15 patients hospitalized for DKA at the Endocrinology Department of Peking Union Medical College Hospital and diagnosed with DKA and gastroparesis between December 1999 and January 2023(DKA+gastroparesis group)were included.Then,we selected 60 DKA patients without DKA as a control group(DKA alone group)based on gender,age,disease course,and diabetes subtype in a 1:4 matching ratio.Clinical manifestations and physical and laboratory examination results were statistically compared between the groups.RESULTS The DKA+gastroparesis group was composed of nine males and six females,with a mean age of 35±11 years,while the DKA alone group included 34 males and 26 females,with a mean age of 34±17 years.In the DKA+gastroparesis group,urine ketone levels normalized,while gastrointestinal symptoms persisted despite treatment,and the tests indicated lower glycosylated hemoglobin levels(HbA1c;7.07%vs 11.51%,P<0.01),largest amplitude of glycemic excursions(5.86 vs 17.41,P<0.01),standard deviation of blood glucose(SDBG;2.69 vs 5.83,P<0.01),and coefficient of blood glucose variation(0.31 vs 0.55,P=0.014)compared with the DKA alone group.Probable gastroparesis was considered at HbA1c<8.55%.Besides,the patients in the DKA+gastroparesis group had lower body mass index(19.28 kg/m^(2) vs 23.86 kg/m^(2),P=0.02)and higher high density lipoprotein cholesterol level(2.34 mmol/L vs 1.05 mmol/L,P=0.019)compared to the DKA alone group,but no difference was observed in the remaining lipid profiles between the two groups.CONCLUSION Gastroparesis should be considered in DKA patients who fail to have improved gastrointestinal symptoms after ketone elimination and acidosis correction,particularly when the HbA1c level is<8.55%.
