中耕培土是我国玉米生产中广泛应用的耕作方法之一,培土在大田管理中占有重要地位。本文采用田间试验,选用玉米品种郑单958 (ZD)和先玉335 (XY),利用PVC管,研究不同培土高度对玉米节根数量和直径的影响。试验中培土高度分别为8 cm (H1)...中耕培土是我国玉米生产中广泛应用的耕作方法之一,培土在大田管理中占有重要地位。本文采用田间试验,选用玉米品种郑单958 (ZD)和先玉335 (XY),利用PVC管,研究不同培土高度对玉米节根数量和直径的影响。试验中培土高度分别为8 cm (H1)和15 cm (H2),不培土植株为对照(CK)。研究结果表明:培土高度对单株玉米节根总数产生显著影响。与CK相比,培土植株的单株节根数显著增加,其中H2处理的节根数最高,与CK相比较,H2处理使郑单958的单株节根总数增加了13. 8%,先玉335增加了7. 4%。这种增加主要是第九层次生根数量的增加所致;培土对单株节根数量的影响存在品种间的差异。与CK相比,培土高度使第八层和(或)第九层次生根直径下降,且存在品种间差异。展开更多
Pain and hyperalgesia occured when L 5 and L 6 spinal nerves were ligated. To ev aluate the electrophysiological changes that contribute to this sensory patholog y, whole cell current clamp recording was performed in ...Pain and hyperalgesia occured when L 5 and L 6 spinal nerves were ligated. To ev aluate the electrophysiological changes that contribute to this sensory patholog y, whole cell current clamp recording was performed in DRGs that was obtained from neuropathic pain and control rats. After nerve ligation, action potential threshold reduced (more negative) in b oth small and median sized DRG neurons (-18.98±0.69 mV vs -11.12±1.06 mV in c ontrol small sized neurons; -19.44 ±2.22 mV vs -14.55±1.81 mV in control m edi an sized neurons), but resting membrane potential action potential duration at half amplitude (APD 1/2 ) and action potential amplitude did not change sign ifica ntly. In addition, obvious membrane potential oscillations were observed in smal l sized DRG neurons from neuropathic pain rats (P<0.05 compared with control group). These results suggested that neuropathic pain increased the exci tability of nociceptors, which may be an important mechanism underlying peripher al hypersensitivity.展开更多
文摘中耕培土是我国玉米生产中广泛应用的耕作方法之一,培土在大田管理中占有重要地位。本文采用田间试验,选用玉米品种郑单958 (ZD)和先玉335 (XY),利用PVC管,研究不同培土高度对玉米节根数量和直径的影响。试验中培土高度分别为8 cm (H1)和15 cm (H2),不培土植株为对照(CK)。研究结果表明:培土高度对单株玉米节根总数产生显著影响。与CK相比,培土植株的单株节根数显著增加,其中H2处理的节根数最高,与CK相比较,H2处理使郑单958的单株节根总数增加了13. 8%,先玉335增加了7. 4%。这种增加主要是第九层次生根数量的增加所致;培土对单株节根数量的影响存在品种间的差异。与CK相比,培土高度使第八层和(或)第九层次生根直径下降,且存在品种间差异。
文摘Pain and hyperalgesia occured when L 5 and L 6 spinal nerves were ligated. To ev aluate the electrophysiological changes that contribute to this sensory patholog y, whole cell current clamp recording was performed in DRGs that was obtained from neuropathic pain and control rats. After nerve ligation, action potential threshold reduced (more negative) in b oth small and median sized DRG neurons (-18.98±0.69 mV vs -11.12±1.06 mV in c ontrol small sized neurons; -19.44 ±2.22 mV vs -14.55±1.81 mV in control m edi an sized neurons), but resting membrane potential action potential duration at half amplitude (APD 1/2 ) and action potential amplitude did not change sign ifica ntly. In addition, obvious membrane potential oscillations were observed in smal l sized DRG neurons from neuropathic pain rats (P<0.05 compared with control group). These results suggested that neuropathic pain increased the exci tability of nociceptors, which may be an important mechanism underlying peripher al hypersensitivity.
