Synthesis and antifungal activities of novel 5-amino-6-arylamino-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one derivatives

A novel approach was developed to regioselectively synthesize new 5-amino-6-arylamino-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one 5 derivatives via a tandem aza-Wittig and annulation reactions of iminophosphorane 2, aromatic isocyanates, and hydrazine in 52-92% isolated yields. The compounds 5 reacted with triethyl orthoformate to give 1,8-2H-pyrazolo[3,4-d][1,2,4]triazolo[1,5-a]pyrimidin-4-ones 6 in good yields (62-94%). Their structures were clearly confirmed by spectroscopy data (IR, (1)H NMR, MS), elemental analysis, or X-ray diffraction crystallography. The results of preliminary bioassay indicated that the compounds 5 and 6 possessed high antifungal activity against Botrytis cinerea Pers and Sclerotinia sclerotiorum. Compounds 5 showed much better antifungal activities when R was Me instead of PhCH 2. Especially, compounds 6c, 6g, and 6i inhibited Sclerotinia by 100% at the concentration of 50 mg/L and by 83, 83, and 82% at the dosage of 10 mg/L, respectively.     

中棉与纳尔逊氏棉（G. nelsonii Fryx）种间杂种F1的研究

本文研究了中棉（Gossypium arboreum race sinense）与纳尔逊氏棉（G. nelsonii Fryx） 种间杂种F1的一些形态性状的遗传变异及花粉母细胞减数分裂的染色体行为。杂种一代呈筒形，全株密集如毡的绒毛，叶片缺刻浅，似纳尔逊氏棉。除第一朵花为闭花外，其余均为开放花，呈玫瑰红色。少数花药退化成托叶状。减数分裂中期I的染     

麦套短季棉主要农艺措施的优化设计

在大田条件下研究了密度、氮肥施用时间、缩节安化控三因素配合对麦套短季棉霜前花率和皮棉产量的影响。结果表明，合理密植、早施氮肥、全程化控三因素的紧密配合是夏棉优质高产的关键。其最佳组合是密度９万～１２万株／公顷，每公顷基施纯氮７５～９０ｋｇ，蕾期、初花期和盛花期各施缩节安１５ｇ、３０ｇ和４５ｇ化控。     

红菜苔种株采收适期的研究

该试验分析了红菜苔（Brassicacampestuisvarpurpurea）种株不同采收期对种子产量和种子质量的影响。种子质量是以种子活力、种子发芽力和种子大小进行评价的。结果显示，红菜苔十月红一号品种在种株最老熟荚果内籽粒变色后13天为最佳采收期。     

温,湿度条件及不同种子处理对棉籽吸胀冷害的影响

棉籽在4－5℃条件下吸水，发生吸胀冷害的程度随吸水速度的加快而减轻，随吸水时间的延长而加重；在10-12℃、18－20℃的水中吸水分别超过16小时、12小时，会因吸水时间过长使部分棉籽的种子活力降低，而使正常发芽率降低。经温汤浸种和预冷处理的棉籽能耐72小时0－5℃的低温，且耐较长时间低温的能力强于干籽与晾干籽；干籽、晾干籽能耐24小时0－2℃的低温，且干籽耐短时间低温的能力强于湿籽。     

剌槐种子萌发过程的微量热法研究

用微量热法测定了剌槐种子的萌发热谱，发现其产热规律与其吸水规律和呼吸规律相关，并获得了衡量种子活力４个参数。     

异源三倍体水稻原生质体培养植株再生

本试验利用二倍体栽培稻（Oryza stativa L.）品种8204,染色体组型为AA,2n=24作为母本,四倍体小粒野生稻（Oryza minuta）染色体组型为BBCC,2n=4x=48作父本杂交,获得异源三倍体杂交种,染色体组型为ABC。F1根尖检查,染色体数目为2n=3x=36。用该异源三倍体杂交种的幼穗诱导愈伤组织,经长期细代培养进行原生质体游离,获     

An Expert System for the Diagnose of peripheral Nerovus Conduction

To promote automation of diagnoses for the pherpheral nervous conduction,byartificial in telligence technique,an expert system of diagnose is formed. This expert system is madefrom the experiences of the soecialists in the field,which constitute the rcasoning rules and k nowl-edge-based of the system,and the database managemnt system.The tests show that the efficiencyand correctness are obviously improved.     

黄土高原半干旱区退耕地沙棘林密度调控

本文以黄土高原半干旱地区吴起县北部沙棘人工成林为研究对象,定位观测了沙棘林地林木蒸腾、土壤蒸发及土壤水分状况等,根据水资源承载能力确定退耕地沙棘林适宜密度及其动态调控。结果表明：沙棘林分生长季节内,丰水年土壤贮水量总体为盈余;平水年的同期降水不能满足林地蒸散消耗;枯水年土壤水分明显亏缺。该地区沙棘林稳定群落密度为1445株（丛）／hm^2,初植密度为2223株（丛）／hm^2。造林密度过大是造成土壤水分亏缺、植被生态效益和经济效益难以发挥的重要因素。     

笼养肉仔鸡生产性能及其胴体品质影响因素的研究

该本文采用三因素三水平正交试验设计，就笼底材料、饲养密度、不同性别组群下3～6周龄AA肉仔鸡的生产性能及其胴体品质进行研究。结果表明：竹竿和塑料笼底下肉仔鸡的胴体品质以及笼养密度11 ～14只／m²下的生产性能较高，以塑料笼底、低密度和公鸡单饲组的肉仔鸡总增重最高，达1.82kg。笼底材料对增重、饲料转化率、屠宰率、腹脂率以及胸肌纤维直径没有影响，但铁丝笼底会导致胸囊肿发病率升高。高饲养密度下能显著降低肉鸡增重和饲料转化率，但肉仔鸡的屠宰率有所增加；而低饲养密度有利于胸肌纤维直径的增加。单饲母鸡的腹脂率显著高于单饲公鸡和公母混群饲养鸡的腹脂率。