A new method for recording activities of spinal motoneurons during fictive swimming in paralyzed teleost fish

ABSTRACT: A new method for monitoring spinal motoneuron activities during fictive swimming in teleost fish was developed. Enamel-insulated copper wire electrodes were implanted in the trunk muscle of goldfish or carp. For each freely moving fish, an electromyogram (EMG) was recorded using the electrodes. In those fish paralyzed with curare, using the same electrode set, bursts of electrical activities consisted of spikes of smaller amplitude and of shorter duration compared with those recorded by EMG. Simultaneous recording of the extracellular activity and intracellular recording from the muscle revealed that the bursts of spikes recorded in the paralyzed fish were motor nerve impulses innervating the muscle and are considered to be fictive swimming activity. The method developed in the present study provides a useful tool with which to investigate neuronal mechanisms underlying swimming activity in teleost fish.     

大豆抗旱节水生理及水肥一体化栽培技术研究初报

为了明确旱作农业区大豆抗旱节水栽培技术,确保大豆生产可持续发展,根据黑龙江省旱作农业区特点,针对大豆抗旱节水生产技术进行了试验研究。结果表明：（1）大豆行间覆膜可提高土壤含水量,与不覆膜相比提高1.19个百分点;（2）喷施土壤调理剂明显改善土壤物理性状,容重低于播前;（3）覆膜配合合理施肥在一定程度上改善了大豆光合作用指标,其产量及水分利用效率高于其它处理。     

大豆抗旱节水生理及水肥一体化栽培技术研究初报

为了明确旱作农业区大豆抗旱节水栽培技术,确保大豆生产可持续发展,根据黑龙江省旱作农业区特点,针对大豆抗旱节水生产技术进行了试验研究。结果表明:(1)大豆行间覆膜可提高土壤含水量,与不覆膜相比提高1.19个百分点;(2)喷施土壤调理剂明显改善土壤物理性状,容重低于播前;(3)覆膜配合合理施肥在一定程度上改善了大豆光合作用指标,其产量及水分利用效率高于其它处理。