Adjusting agronomic measures to alleviate the kernel position effect in maize is important for ensuring high yields.In order to clarify whether the combined application of organic fertilizer and chemical fertilizer(CA...Adjusting agronomic measures to alleviate the kernel position effect in maize is important for ensuring high yields.In order to clarify whether the combined application of organic fertilizer and chemical fertilizer(CAOFCF)can alleviate the kernel position effect of summer maize,field experiments were conducted during the 2019 and 2020 growing seasons,and five treatments were assessed:CF,100%chemical fertilizer;OFCF1,15%organic fertilizer+85%chemical fertilizer;OFCF2,30%organic fertilizer+70%chemical fertilizer;OFCF3,45%organic fertilizer+55%chemical fertilizer;and OFCF4,60%organic fertilizer+40%chemical fertilizer.Compared with the CF treatment,the OFCF1 and OFCF2 treatments significantly alleviated the kernel position effect by increasing the weight ratio of inferior kernels to superior kernels and reducing the weight gap between the superior and inferior kernels.These effects were largely due to the improved filling and starch accumulation of inferior kernels.However,there were no obvious differences in the kernel position effect among plants treated with CF,OFCF3,or OFCF4 in most cases.Leaf area indexes,post-silking photosynthetic rates,and net assimilation rates were higher in plants treated with OFCF1 or OFCF2 than in those treated with CF,reflecting an enhanced photosynthetic capacity and improved postsilking dry matter accumulation(DMA)in the plants treated with OFCF1 or OFCF2.Compared with the CF treatment,the OFCF1 and OFCF2 treatments increased post-silking N uptake by 66.3 and 75.5%,respectively,which was the major factor driving post-silking photosynthetic capacity and DMA.Moreover,the increases in root DMA and zeatin riboside content observed following the OFCF1 and OFCF2 treatments resulted in reduced root senescence,which is associated with an increased post-silking N uptake.Analyses showed that post-silking N uptake,DMA,and grain yield in summer maize were negatively correlated with the kernel position effect.In conclusion,the combined application of 15-30%organic fertilizer and 70-85%chemical fertilizer alleviated the kernel position effect in summer maize by improving post-silking N uptake and DMA.These results provide new insights into how CAOFCF can be used to improve maize productivity.展开更多
BACKGROUND Meningioma in the cerebellopontine angle(CPA)without dural attachment is extremely rare.We report a unique case of meningioma derived from the superior petrosal vein without dural attachment.CASE SUMMARY A ...BACKGROUND Meningioma in the cerebellopontine angle(CPA)without dural attachment is extremely rare.We report a unique case of meningioma derived from the superior petrosal vein without dural attachment.CASE SUMMARY A 44-year-old right-handed woman presented with a two-month history of headache and tinnitus.Brain magnetic resonance imaging showed a well-defined contrast-enhancing lesion in the right CPA without a dural tail sign.Tumor resection was performed using a right retro sigmoid approach.A dural attachment was not seen at the tentorium or posterior surface of the petrous pyramid.The tumor was firmly adherent to the superior petrosal vein.The origin site was cauterized and resected with the preservation of the superior petrosal vein.A diagnosis of meningothelial meningioma was made.The patient’s headache and tinnitus gradually disappeared,and a recurrence was not observed five years after the surgery.CONCLUSION The rare occurrence of meningioma without dural attachment makes it difficult to determine dural attachment before surgery.The absence of dural attachment makes it easy to completely resect such tumors.Vessels related to tumors should be removed carefully,considering the possible presence of tumor stem cells in the microvessels.展开更多
目的探讨肺超声技术在妊娠期高血压疾病产妇容量管理中的应用效果。方法选取2022年3月至2023年12月在北京市海淀区妇幼保健院住院行剖宫产术的妊娠期高血压疾病的产妇291例,按随机数字表法随机分为试验组(肺超声组)144例和对照组147例,...目的探讨肺超声技术在妊娠期高血压疾病产妇容量管理中的应用效果。方法选取2022年3月至2023年12月在北京市海淀区妇幼保健院住院行剖宫产术的妊娠期高血压疾病的产妇291例,按随机数字表法随机分为试验组(肺超声组)144例和对照组147例,肺超声组,在开腹前(T_(0))、胎儿娩出后5min(T_(1))、手术结束(T_(2))实施肺超声扫查如显示肺损伤程度评分为2分时,给予利尿处理;对照组,当中心静脉压(CVP)>12 cm H_(2)O,或少尿时给与利尿处理。观察并记录2组产妇的年龄、身高、体质量、孕周、疾病类型;术中记录2组产妇T_(0)、T_(1)、T_(2)时,平均动脉压(MAP)、心率;记录手术时长、术中液体入量、输血量、术中出血量、尿量、血管活性药物的剂量、利尿剂的剂量;肺超声组记录术毕(T_(2))两肺的肺损伤程度评分、CVP值、氧合指数(oxygenation Index,OI)。记录2组产妇术后24 h肺部并发症的发生情况、住院时间。结果2组产妇组间年龄、身高、体质量、孕周、疾病类型等比较,差异均无统计学意义(P>0.05);2组产妇T_(0)、T_(1)、T_(2)的MAP、心率比较,差异均无统计学意义(P>0.05);2组产妇MAP、HR组内比较,差异具有统计学意义(P<0.001)2组产妇手术时长、术中液体入量、输血量、术中出血量、尿量比较,差异均无统计学意义(P>0.05);2组产妇术中血管活性药物的使用剂量比较,差异无统计学意义(P>0.05);2组产妇呋塞米的使用剂量比较,差异具有统计学意义(P<0.05);2组产妇肺部并发症的发生情况的比较差异有统计学意义(P<0.05);2组住院时间比较,差异均无统计学意义(P>0.05);试验组肺损伤程度评分与氧合指数(OI)呈显著负相关(r=-0.249,P=0.005);肺损伤程度评分与CVP值之间呈显著正相关(r=0.425,P<0.01)。结论肺部超声技术可以直观、动态地评估妊娠期高血压疾病产妇的容量情况,在容量管理方面有一定的优势,值得临床推广应用。展开更多
基金financially supported by the HAAFS Science and Technology Innovation Special Project China(2022KJCXZX-LYS-9)the Natural Science Foundation of Hebei Province China(C2021301004)the Key Research and Dvelopment Program of Hebei Province China(20326401D)。
文摘Adjusting agronomic measures to alleviate the kernel position effect in maize is important for ensuring high yields.In order to clarify whether the combined application of organic fertilizer and chemical fertilizer(CAOFCF)can alleviate the kernel position effect of summer maize,field experiments were conducted during the 2019 and 2020 growing seasons,and five treatments were assessed:CF,100%chemical fertilizer;OFCF1,15%organic fertilizer+85%chemical fertilizer;OFCF2,30%organic fertilizer+70%chemical fertilizer;OFCF3,45%organic fertilizer+55%chemical fertilizer;and OFCF4,60%organic fertilizer+40%chemical fertilizer.Compared with the CF treatment,the OFCF1 and OFCF2 treatments significantly alleviated the kernel position effect by increasing the weight ratio of inferior kernels to superior kernels and reducing the weight gap between the superior and inferior kernels.These effects were largely due to the improved filling and starch accumulation of inferior kernels.However,there were no obvious differences in the kernel position effect among plants treated with CF,OFCF3,or OFCF4 in most cases.Leaf area indexes,post-silking photosynthetic rates,and net assimilation rates were higher in plants treated with OFCF1 or OFCF2 than in those treated with CF,reflecting an enhanced photosynthetic capacity and improved postsilking dry matter accumulation(DMA)in the plants treated with OFCF1 or OFCF2.Compared with the CF treatment,the OFCF1 and OFCF2 treatments increased post-silking N uptake by 66.3 and 75.5%,respectively,which was the major factor driving post-silking photosynthetic capacity and DMA.Moreover,the increases in root DMA and zeatin riboside content observed following the OFCF1 and OFCF2 treatments resulted in reduced root senescence,which is associated with an increased post-silking N uptake.Analyses showed that post-silking N uptake,DMA,and grain yield in summer maize were negatively correlated with the kernel position effect.In conclusion,the combined application of 15-30%organic fertilizer and 70-85%chemical fertilizer alleviated the kernel position effect in summer maize by improving post-silking N uptake and DMA.These results provide new insights into how CAOFCF can be used to improve maize productivity.
文摘BACKGROUND Meningioma in the cerebellopontine angle(CPA)without dural attachment is extremely rare.We report a unique case of meningioma derived from the superior petrosal vein without dural attachment.CASE SUMMARY A 44-year-old right-handed woman presented with a two-month history of headache and tinnitus.Brain magnetic resonance imaging showed a well-defined contrast-enhancing lesion in the right CPA without a dural tail sign.Tumor resection was performed using a right retro sigmoid approach.A dural attachment was not seen at the tentorium or posterior surface of the petrous pyramid.The tumor was firmly adherent to the superior petrosal vein.The origin site was cauterized and resected with the preservation of the superior petrosal vein.A diagnosis of meningothelial meningioma was made.The patient’s headache and tinnitus gradually disappeared,and a recurrence was not observed five years after the surgery.CONCLUSION The rare occurrence of meningioma without dural attachment makes it difficult to determine dural attachment before surgery.The absence of dural attachment makes it easy to completely resect such tumors.Vessels related to tumors should be removed carefully,considering the possible presence of tumor stem cells in the microvessels.
文摘目的探讨肺超声技术在妊娠期高血压疾病产妇容量管理中的应用效果。方法选取2022年3月至2023年12月在北京市海淀区妇幼保健院住院行剖宫产术的妊娠期高血压疾病的产妇291例,按随机数字表法随机分为试验组(肺超声组)144例和对照组147例,肺超声组,在开腹前(T_(0))、胎儿娩出后5min(T_(1))、手术结束(T_(2))实施肺超声扫查如显示肺损伤程度评分为2分时,给予利尿处理;对照组,当中心静脉压(CVP)>12 cm H_(2)O,或少尿时给与利尿处理。观察并记录2组产妇的年龄、身高、体质量、孕周、疾病类型;术中记录2组产妇T_(0)、T_(1)、T_(2)时,平均动脉压(MAP)、心率;记录手术时长、术中液体入量、输血量、术中出血量、尿量、血管活性药物的剂量、利尿剂的剂量;肺超声组记录术毕(T_(2))两肺的肺损伤程度评分、CVP值、氧合指数(oxygenation Index,OI)。记录2组产妇术后24 h肺部并发症的发生情况、住院时间。结果2组产妇组间年龄、身高、体质量、孕周、疾病类型等比较,差异均无统计学意义(P>0.05);2组产妇T_(0)、T_(1)、T_(2)的MAP、心率比较,差异均无统计学意义(P>0.05);2组产妇MAP、HR组内比较,差异具有统计学意义(P<0.001)2组产妇手术时长、术中液体入量、输血量、术中出血量、尿量比较,差异均无统计学意义(P>0.05);2组产妇术中血管活性药物的使用剂量比较,差异无统计学意义(P>0.05);2组产妇呋塞米的使用剂量比较,差异具有统计学意义(P<0.05);2组产妇肺部并发症的发生情况的比较差异有统计学意义(P<0.05);2组住院时间比较,差异均无统计学意义(P>0.05);试验组肺损伤程度评分与氧合指数(OI)呈显著负相关(r=-0.249,P=0.005);肺损伤程度评分与CVP值之间呈显著正相关(r=0.425,P<0.01)。结论肺部超声技术可以直观、动态地评估妊娠期高血压疾病产妇的容量情况,在容量管理方面有一定的优势,值得临床推广应用。
