矮杨梅

杨梅是我国江南的著名水果,而同为杨梅科杨梅属植物的矮杨梅,知道的人恐伯就不多了。矮杨梅与杨梅在果实的大小、色泽上都很相似,但株高相差甚远,杨梅是高十几米的乔木,矮杨梅却是矮小的灌木。 矮杨梅(Myrica nana),又称云南杨梅。由于它的生长习性和形态特征,在产地又有爬地杨梅、矮脚杨梅、大果杨梅等俗称。     

沙库巴曲缬沙坦联合胺碘酮对老年HF伴PAF患者心功能、炎症因子及神经内分泌激素的影响

目的:探讨沙库巴曲缬沙坦联合胺碘酮对老年心力衰竭(HF)伴阵发性房颤(PAF)患者心功能、神经内分泌激素以及炎症因子的影响.方法:选取2017年2月～2019年1月期间我院收治的80例老年HF伴PAF患者,根据随机数字表法分为研究组(n=40,沙库巴曲缬沙坦联合胺碘酮治疗)和对照组(n=40,胺碘酮治疗),比较两组患者...     

Thinopyrum ponticum and Th. intermedium:the promising source of resistance to fungal and viral diseases of wheat

Thinopyrum ponticum and Th. intermedium provide superior resistance against various diseases in wheat （Ttricum aestivum）. Because of their readily crossing with wheat, many genes for disease resistance have been introduced from the wheatgrasses into wheat. Genes for resistance to leaf rust, stem rust, powdery mildew, Barley yellow dwarf virus, Wheat streak mosaic virus, and its vector, the wheat curl mite, have been transferred into wheat by producing chromosome translocations. These genes offer an opportunity to improve resistance of wheat to the diseases; some of them have been extensively used in protecting wheat from damage of the diseases. Moreover, new resistance to diseases is continuously detected in the progenies of wheat-Thinopyrum derivatives. The present article summaries characterization and application of the genes for fungal and viral disease-resistance derived from Th. ponticum and Th. intermedium.     

粘质沙雷氏菌中灵杆菌素合成因素探究进展

灵杆菌素主要由粘质沙雷氏菌产生,其本身是微生物的一种次生代谢产物,属于脂多糖,也是一种典型的生物碱,具有抗癌、抑菌、增强免疫力、抗原虫、抗疟疾等多种生理活性,是化妆品、染料和水体污染治理等领域新兴且不可或缺的成分.随着医药业和工农业等不断发展,灵杆菌素的应用也越来越多,其良好的应用前景使得它的合成和提取工艺成为次生代谢领域的研究热点.但是,目前灵杆菌素的全化学合成和发酵生产受到很多因素的影响,大大阻碍了它的规模化生产和应用,本文重点对影响灵杆菌素生物合成的因素进行了综述,同时对其可能的作用机制进行了总结.本研究表明,微生物发酵生产灵杆菌素时,菌种、营养条件、环境因素(包括培养温度,pH值,溶解氧,光照)、金属离子等因素对灵杆菌素的合成都十分重要,另外再结合基因工程等技术,可大幅度提高灵杆菌素的产量.本综述为灵杆菌素的工业发酵生产提供重要依据.