The microstructure of the cuticle‐less shell of the eggs of the domestic hen

1. Open pores were a notable feature of the shell of hens' eggs which were naturally devoid of cuticle.

2. In contrast with normal eggs, the surface of the cuticle‐less shell was irregularly contoured and, in many instances, deeply fissured.     

Book reviews

Food Quality Control, Foods of Animal Origin, by H. V. Hagstad and W. T. Hubbert, 1986. viii+148 pp. illustrated. Ames, The Iowa State University Press. £12.95. ISBN 0 8138 0702 6.

Animal Nutrition, by A. A. Bond, 1987. English edition. 540 pp, illustrated. Chichester, John Wiley & Sons. ISBN 0 471 90375 2.

Egg Quality—Current Problems and Recent Advances—Poultry Science Symposium 20, Edited by R. G. Wells and C. G. Belyavin, 1987. 302 pp. illustrated. London, Butterworths. £35.00. ISBN 0 470 00470 X.

The Microbiology of Poultry Meat Products, Edited by F. E. Cunningham and N. A. Cox, 1987. ix+359 pp. illustrated. Orlando, Florida, Academic Press. £54.00, $65.00. ISBN 0 12 199880 0.     

肩负农民嘱托谱写华彩乐章——记丹东农科院玉米所所长、党的十七大代表何晶

"四季轮回里,她像候鸟般跋涉着,追着春天播下的种子,追着秋天收获果实。如一位耕耘者,她专注于田畴,挥洒着智慧与汗水,为的是让     

普通钝绥螨的生物学特性

研究了温度、湿度对普通钝绥螨 Amblyseius vulgaris Liang et Ke 生长发育繁殖的影响.结果表明,25℃为最适温度.25℃下,未成熟期平均发育历期5.16d,成螨寿命34.16d,产卵期21.85d,平均每雌总产卵量45.62粒,种群内禀增长率 r_m=0.259.湿度对螨卵孵化和幼螨成活影响很大,25℃下相对湿度不足43%是限制卵孵化的极限区.     

中国三尖杉属植物资源研究

三尖杉属（Ｃｅｐｈａｌｏｔａｘｕｓ）隶属于三尖杉科（Ｃｅｐｈａｌｏｔａｘａｃｅａｅ）。该科仅１属９种，中国产７种３变种，１引种栽培变种。分布于亚洲东部至南亚次大陆。供药用的有三尖杉（ＣｆｏｒｔｕｎｅｉＨｏｏｋｆ）、粗榧［Ｃｓｉｎｅｎｓｉｓ（ＲｅｌｄｅｔＷｉｌｓ）Ｌｉ］、海南粗榧（ＣｈａｉｎａｎｅｎｓｉｓＬｉ）和篦子三尖杉（ＣｏｌｉｖｅｒｉＭａｓｔ）。细胞组织培养技术是开辟该属资源的重要途径，对合理开发利用这一资源具有重要意义。     

The behaviour of mixed bacterial infections in the shell membranes of the hen's egg

The selection of Gram‐negative bacteria from a heterogenous flora on the shell membranes of the hen's egg occurred during two phases of the infection process. When the infection was confined to the shell membranes, the Gram‐negative bacteria achieved dominance over the Gram‐positive organisms. This dominance was accentuated when the albumen was invaded and it was noted, moreover, that a particular strain of Gram‐negative bacteria predominated whereas several strains co‐existed in the shell membranes.     

2011在传承与创新中前行

一度春秋,一圈年轮,我们迎来了充满希望的2011年.2010年,是我国应对国际金融危机,保持国内经济平稳较快发展,深入落实十一五规划的重要一年,也是谋划和制定十二五规划的关键之年.     

The effect of iron on the growth of Escherichia coli in albumen taken from the hen's egg

Small inocula of Escherichia coli did not initiate either growth or glucose utilisation in hen's egg white in vitro unless ovotransferrin was quenched with iron. The most rapid and extensive growth occurred in iron‐supplemented albumen containing additional ammonium ions. In albumen containing a large inoculum, glucose utilisation was promoted by the addition of NH₄+ but not Fe³⁺. The action of NH₄+ was suppressed by the addition of chloramphenicol to heavily seeded albumen.