鲁南砂姜黑土及其有机无机复合体中无机磷的组成和分布   总被引：2，自引：0，他引：2  

武心齐  孙华 《南京农业大学学报》1998,21(4):57-61

采用石灰性土壤无机磷分级法研究了不同肥力砂姜黑土无机磷的组成与分布。结果表明，砂姜黑土及其有机无机复合体中无机磷以磷酸＝钙盐和闭蓄态磷酸盐为主，分别占无机磷总量的２７％－４８％和２６％－３７％。土壤无机磷中的Ｃ２－Ｐ，Ｃａ８－Ｐ，Ａｌ－Ｐ，Ｆｅ－Ｐ均与速效磷存在着显著的正相关，并且随着土壤肥力水平的提高，其含量亦随之增加。土壤无机磷主要集中分布于〈５μｍ粒级的有机无机复合体中，各种形态无机磷的含量  相似文献   

松针褐斑病初步研究     

林官乐  章明靖 《浙江林业科技》1997,17(3):26-28

松针褐斑病的病原菌为Ｉｅｃａｎｏｓｔｉｃｔａ ａｃｉｃｏｌａ，在病叶上或叶上的病了实体和病组织中的菌丝体是初侵染源。侵染期主要在５月上旬至６月中旬。病原菌通过雨水的溅散主风力而传播。在发病初期采用百菌清可湿性粉剂和托布津农药喷液及人工摘病叶的进行防治，均能收到一定效果。  相似文献   

《长恨歌》中杨贵妃命运的文化解读     

杨桦 《信阳农业高等专科学校学报》2007,17(2):87-88

被誉为古代四大美女之一的杨贵妃,从青春华茂到悲辛收场,最终难逃“红颜薄命”的宿命。作为封建帝王的一个玩物,她的死既是一个爱情悲剧,更是一个政治斗争的牺牲品。  相似文献   

Study on the Anti-Escherichia coli Activity and Mechanism of Water Extract of Radix isatidis Powder     

JIANG Xiaowen  YAN Ge  LI Shuhong  YU Wenhui  WEI Jiayu  AI Liwen  BAI Wen 《中国畜牧兽医》2007,47(9):2968-2978

In order to explore the antibacterial activity and mechanism of the Radix isatidis powder water extract,the effects of the Radix isatidis powder water extract on the morphology and structure of Escherichia coli (E.coli) were tested by scanning electron microscopy and transmission electron microscopy.The effects of the Radix isatidis powder water extract on the conductivity and total leakage rate of E.coli and the content of alkaline phosphatase in the culture medium of the content of protein,DNA and RNA were stained by DAPI to detect the effect of the Radix isatidis powder water extract on the nucleic acid of E.coli,and the effect of the Radix isatidis powder water extract on the metabolism of E.coli in vivo,in vitro,ALT,AST,pyruvic acid and ATP.The results showed that after the Radix isatidis powder water extract acted on E.coli for 10 h,it was observed by SEM that the bacteria appeared to overflow and shrink,the length of the bacteria became shorter obviously,many residues were formed due to breakage,some of them were sunken in the middle and deformed.Under TEM,it was observed that the boundary of the cell wall of E.coli was unclear,the wall membrane was zigzag,deformed and some of the bacteria were broken.The protein content outside the cell was significantly different from that in the blank control group from 8 h (P<0.01), and that in the cell from 4 h (P<0.01). DNA content had no significant difference with blank control group before 12 h (P>0.05), but had significant difference with blank control group from 16 h (P<0.01); RNA content began to decrease at 8 h, and was significantly different from blank control group at 12 h (P<0.05), and was extremely significant from 16 h (P<0.01). There was no significant difference between ALT and AST (P>0.05). The pyruvate content in culture medium and bacteria was higher than that in blank control group, and the difference was very significant from 4 h (P<0.01). The ATP content in the culture medium was significantly different from that in the blank control group (P<0.01), and the ATP content in the cell was significantly different from that in the blank control group from 4 h (P<0.01).In conclusion,the Radix isatidis powder water extract could inhibit the synthesis and metabolism of bacterial genetic material and the content of pyruvate and ATP by destroying the integrity of cell wall and cell membrane.  相似文献   

Bone strength of laying hens kept in an alternative system, compared with hens in cages and on deep-litter     

G. N⊘rgaard‐Nielsen 《British poultry science》1990,31(1):81-89

1. Observations of vigorous wing movements and measurements of bone strength were compared in two experiments with birds in three different housing systems: a semi-intensive alternative system under development, a battery cage system and a deep-litter system. 2. A significant effect of housing system on the frequency of vigorous wing movements was found. The highest frequency was seen in the deep-litter system, about half this number in the alternative system, while in the battery cages they were never observed. 3. Corresponding to this a reduction in humerus strength of 9% was found in hens from the alternative system and of 45% in hens from cages, compared with deep-litter. A reduction in tibial breaking strength was also found in caged hens, when compared to deep-litter hens. 4. Keeping hens in cages thus restricts their movements, especially wing movements, to the degree that bone strength is greatly reduced. 5. This has welfare implications, for hens with low bone breaking strength risk a possibility of breakage, especially when handled and transported. When alternative systems are designed opportunities for movement in the three dimensions should be considered.  相似文献   

EFFECTS OF CADMIUM STRESS ON THE ANTIOXIDANT ENZYMES ACTIVITIES IN Arundo donax L.     

HAN Zhi-ping  LV Chun-yan  WANG Chen-yi  ZHANG Hua  ZHAO Yan  ZHUANG Zhu-juan  KUANG Jia-cai  XU Wei-ping 《核农学报》2008,22(6)

  相似文献   

水富生态旅游文化浅淡     

杨雪 《内蒙古林业调查设计》2009,32(5):114-116

国家林业局提出现代林业建设目标之一是构建三大体系。2007年,针对森林公园,又发出了进一步加强生态文化建设的通知,要求加强生态文化基础设施建设和生态文化内涵的挖掘,倡导森林文化、花文化、竹文化、茶文化、湿地文化、野生动物文化、宗教文化、少数民族文化、民俗文化、耕作文化等等,文章就云南水富生态旅游文化提出浅议,供参考。  相似文献   

酶法提取椰子蛋白质及其对亚基的影响   总被引：2，自引：0，他引：2  

郑亚军  李艳  陈华  张木炎  马子龙 《果树学报》2009,26(1)

研究酶制剂的种类、用量、提取温度、pH、料液比等因素对椰子蛋白质提取率的影响,通过正交试验研究最佳的提取条件。得到的椰子蛋白质进行SDS-PAGE分析,研究酶法提取对椰子蛋白质亚基组成的影响。结果表明,添加质量分数0.3%的风味蛋白酶的提取效果最好,各因素对提取率影响的次序为:料液比>pH>温度>提取时间,其中,料液比和pH对提取率的影响达到了显著水平;最佳工艺参数为:酶质量分数0.3%、50℃、pH8.5、料液比1∶15和时间2h,在此条件下,椰子蛋白质的提取率为78.28%。SDS-PAGE分析表明,风味蛋白酶对椰子蛋白的酶解作用十分显著,与缓冲溶液提取的椰子蛋白质相比,酶法提取的椰子蛋白质中小分子质量亚基含量很高。  相似文献   

毕节地区综合利用秸秆资源发展畜牧业的探讨   总被引：2，自引：0，他引：2  

宋德荣  张文  彭华  周大荣 《现代农业科技》2009,(24):300-301

秸秆资源的利用是解决畜牧业发展饲料短缺的途径之一。分析毕节地区秸秆资源生产及利用现状,指出加快秸秆开发及深加工利用的意义,并对比常用秸秆处理技术,探讨秸秆养畜开发前景。  相似文献   

Treatment of canine babesiasis with imidocarb dihydrochloride     

Xue  Ligang  Zhang  Yongmei  Shi  Baokong 《Tropical animal health and production》1997,29(4):85S-85S

Tropical Animal Health and Production -  相似文献