烟2415育种思路与后代选择技术探讨

对烟2415小麦品种的育种思路和育种技术进行了探讨。认为:在组合评选的基础上杂种早期世代改单株选择为单穗选择,生理性状上注重穗粒数/旗叶面积、穗粒重/旗叶面积的选择,抗逆性和稳产性上注重结实性的选择,高代品系筛选采用高低密度交替选择,是提高小麦育种效率的有效方法。     

Fear erasure in mice requires synergy between antidepressant drugs and extinction training

Antidepressant drugs and psychotherapy combined are more effective in treating mood disorders than either treatment alone, but the neurobiological basis of this interaction is unknown. To investigate how antidepressants influence the response of mood-related systems to behavioral experience, we used a fear-conditioning and extinction paradigm in mice. Combining extinction training with chronic fluoxetine, but neither treatment alone, induced an enduring loss of conditioned fear memory in adult animals. Fluoxetine treatment increased synaptic plasticity, converted the fear memory circuitry to a more immature state, and acted through local brain-derived neurotrophic factor. Fluoxetine-induced plasticity may allow fear erasure by extinction-guided remodeling of the memory circuitry. Thus, the pharmacological effects of antidepressants need to be combined with psychological rehabilitation to reorganize networks rendered more plastic by the drug treatment.     

Modelling optimal crop sequences using network flows

In recent years there has been an increased focus on sustainable farming systems. This has led to an increase in the use of farm models built to assess the environmental impact from farming. In whole-farm models including crop production it is important to consider the rotation of crops, since this has a major impact on the consequences of the crop production.     

犬吃葡萄中毒后的急救措施

犬吃葡萄是很危险的,特别是极个别的犬可能会造成急性肾衰竭而死亡,但至今尚未弄清犬吃葡萄引发急性肾衰竭的机制。最近,我们在临床接诊了一例西施犬因吃葡萄。三天不能进食,频繁呕吐等中毒现象。由于及时抢救,措施得当,才转危为安。救治成功后,我们对其它两头犬又作了吃葡萄中毒试验。     

PBAT/PLA全生物降解地膜的降解性能及对石河子垦区棉花生长的影响

为探讨PBAT/PLA全生物降解地膜在新疆棉花上的应用效果,以PE地膜为对照,在新疆石河子垦区开展PBAT/PLA全生物降解地膜应用试验,系统分析了PBAT/PLA地膜的降解性能及其对土壤温湿度、棉花长势和产量的影响。结果表明：PBAT/PLA地膜降解较快,在覆膜43 d即进入诱导期;红外、X射线衍射、扫描电镜等测试也表征出PBAT/PLA地膜田间降解后分子链、晶体结构和微观形貌等发生的一系列变化;在棉花生育前期,PBAT/PLA地膜膜面保持完整,增温保墒效果良好,两组出苗率一致;但随着PBAT/PLA地膜逐渐裂解,其应用效果开始下降,棉花进入盛蕾期后,PBAT/PLA地膜覆盖下土壤温度和含水率比PE地膜覆盖分别低0.30～1.15℃和2.31～3.46个百分点,最终导致PBAT/PLA地膜组的株高和茎粗较PE地膜组分别降低22.08%和12.82%,籽棉减产20.24%。因此,PBAT/PLA全生物降解地膜还需从材料分子链结构层面进行配方改良、推迟降解诱导期、提高棉田覆盖应用潜力,使其能更好在新疆棉花生产中进行试用推广。     

Isotope Oxygen-18 as Natural Tracer of Water Movement in a Coarse Gravel Unsaturated Zone

Water, Air, & Soil Pollution - In the present work, rapid test methods for field screening of soil for Cu, Ni, and Pb content are presented. They are based on commercially obtainable Microquant...