为实现马尾松无性系种子园精准施肥和丰产经营,用不同结实能力无性系作为材料,设置每株0、400、800和1600 g 4个磷肥水平(分别记为P_(0)、P_(4)、P_(8)和P_(16)),分别在花原基形成前和球果采摘后施肥,研究磷肥对马尾松无性系雌球花量的...为实现马尾松无性系种子园精准施肥和丰产经营,用不同结实能力无性系作为材料,设置每株0、400、800和1600 g 4个磷肥水平(分别记为P_(0)、P_(4)、P_(8)和P_(16)),分别在花原基形成前和球果采摘后施肥,研究磷肥对马尾松无性系雌球花量的影响,以及花原基形成期和球花分化前期不同高度的针叶N、P含量的变化。结果表明:与P_(0)处理相比,P_(8)和P_(16)处理显著提高马尾松无性系雌球花量,2018年增幅分别为67.4%和61.2%,2019年增幅分别为28.9%和14.1%。雌球花量与针叶N含量和N/P呈显著负相关,与P含量呈显著正相关。不同结实能力无性系针叶N、P含量对P肥的响应存在差异。花原基形成期,结实能力弱的无性系N含量高,N/P值在11.5~12.5;结实能力强的无性系P含量高,N/P值在9.5~10.5,且在此时期大多数无性系在P8处理下P含量最高,N/P最低。球花分化前期,两种无性系N/P值分别在15.3~17.0和13.2~15.1。无性系上部针叶P含量显著高于中部和下部,而N/P显著低于中部和下部。综上,每株施800 g磷肥可提高不同结实能力无性系花原基形成期针叶P含量,降低N/P,有利于雌球花的形成,对提高无性系种子园产量具有促进作用。展开更多
Background Acute myocardial depression caused by sepsis is an important cause of early death in sepsis patients.This study aimed to evaluate the effects of levosimendan on septic myocardial depression compared with th...Background Acute myocardial depression caused by sepsis is an important cause of early death in sepsis patients.This study aimed to evaluate the effects of levosimendan on septic myocardial depression compared with the control treatment.Methods A single-center study was conducted from Jan 15th 2019 to Jan 20th 2020.A total of 112 patients with septic myocardial depression were included and divided into levosimendan(LEV)group(n=49)and the control group(n=63)based on the administration of levosimendan.Clinical data including heart function,mechanical ventilation time,the length of intensive care unit(ICU)stay,the incidence of acute pulmonary edema and 28-day of survival rates were recorded.Results Compared with the control group,the improvement of left ventricular ejection fraction(LVEF)was greater in LEV group after one week treatment(52.41±4.62 vs.47.32±4.31,P=0.003).The level of N-terminal pro-brain natriuretic peptide(NT-pro-BNP)decreased more significantly(1882.92±190.61 pg/mL vs.3374.62±453.13 pg/mL,P=0.004).The mechanical ventilation time(112.43±9.11 h vs.135.34±12.54 h,P=0.013)and the length of ICU stay were also shorter(10.53±3.32 d vs.16.82±5.24 d,P=0.027)than that in the control group,and the incidence of acute pulmonary edema was lower(9.91%vs.17.22%,P=0.041).However,Kaplan-Meier analysis indicated there was no significant difference in both group for 28-day survival rates.Conclusions Levosimendan can improve cardiac function and shorten the duration of mechanical ventilation and ICU hospitalization for septic shock patients with myocardial depression.展开更多
文摘为实现马尾松无性系种子园精准施肥和丰产经营,用不同结实能力无性系作为材料,设置每株0、400、800和1600 g 4个磷肥水平(分别记为P_(0)、P_(4)、P_(8)和P_(16)),分别在花原基形成前和球果采摘后施肥,研究磷肥对马尾松无性系雌球花量的影响,以及花原基形成期和球花分化前期不同高度的针叶N、P含量的变化。结果表明:与P_(0)处理相比,P_(8)和P_(16)处理显著提高马尾松无性系雌球花量,2018年增幅分别为67.4%和61.2%,2019年增幅分别为28.9%和14.1%。雌球花量与针叶N含量和N/P呈显著负相关,与P含量呈显著正相关。不同结实能力无性系针叶N、P含量对P肥的响应存在差异。花原基形成期,结实能力弱的无性系N含量高,N/P值在11.5~12.5;结实能力强的无性系P含量高,N/P值在9.5~10.5,且在此时期大多数无性系在P8处理下P含量最高,N/P最低。球花分化前期,两种无性系N/P值分别在15.3~17.0和13.2~15.1。无性系上部针叶P含量显著高于中部和下部,而N/P显著低于中部和下部。综上,每株施800 g磷肥可提高不同结实能力无性系花原基形成期针叶P含量,降低N/P,有利于雌球花的形成,对提高无性系种子园产量具有促进作用。
基金National Natural Science Foundation of China(No.81701875)Science and Technology Program of Guangzhou,China(No.201904010039)Natural Science Foundation of Guangdong Province of China(No.10451008002006285)。
文摘Background Acute myocardial depression caused by sepsis is an important cause of early death in sepsis patients.This study aimed to evaluate the effects of levosimendan on septic myocardial depression compared with the control treatment.Methods A single-center study was conducted from Jan 15th 2019 to Jan 20th 2020.A total of 112 patients with septic myocardial depression were included and divided into levosimendan(LEV)group(n=49)and the control group(n=63)based on the administration of levosimendan.Clinical data including heart function,mechanical ventilation time,the length of intensive care unit(ICU)stay,the incidence of acute pulmonary edema and 28-day of survival rates were recorded.Results Compared with the control group,the improvement of left ventricular ejection fraction(LVEF)was greater in LEV group after one week treatment(52.41±4.62 vs.47.32±4.31,P=0.003).The level of N-terminal pro-brain natriuretic peptide(NT-pro-BNP)decreased more significantly(1882.92±190.61 pg/mL vs.3374.62±453.13 pg/mL,P=0.004).The mechanical ventilation time(112.43±9.11 h vs.135.34±12.54 h,P=0.013)and the length of ICU stay were also shorter(10.53±3.32 d vs.16.82±5.24 d,P=0.027)than that in the control group,and the incidence of acute pulmonary edema was lower(9.91%vs.17.22%,P=0.041).However,Kaplan-Meier analysis indicated there was no significant difference in both group for 28-day survival rates.Conclusions Levosimendan can improve cardiac function and shorten the duration of mechanical ventilation and ICU hospitalization for septic shock patients with myocardial depression.
