99'北京国际古人类学学术研讨会圆满结束

为纪念北京猿人第一个头盖骨发现70周年,中国科学院古脊椎动物与古人类研究所在国家自然科学基金和中国科学院南南合作基金的支持下,于1999年10月12日至16日在北京举办了99北京国际古人类学学术研讨会暨纪念北京猿人第一个头盖骨发现70周年的学术活动。这一活动分两个部分:纪念北京猿人第一个头盖骨发现70周年大会和国际古人类学学术研讨会。纪念大会于12日上午在人民大会堂举行。中国科学院院长路甬祥院士、国家文物局局长张文彬先生以及联合国教科文组织总干事代表野口升先生在会上作了重要讲话。他们再次强调了北京猿人头骨发现的意义以…     

安捷伦科技亮相第十二届北京分析测试学术报告会及展览会

跨国高科技公司安捷伦科技(NYSE:A)参加了10月18日至10月21日在北京举办的第十二届北京分析测试学术报告会及展览会(BCEIA),这也是安捷伦连续第十二次参加该行业盛会。会上,安捷伦展示了其全线分析产品,备受广大行业用户和媒体的关注。在北京举行的媒体见面会上,安捷伦科技公司     

《生命世界》杂志被命名为北京市科普传媒基地

2009年6月14日,由北京植物学会、《生命世界》杂志社共同举办的“北京植物学会会员日”活动在高教出版社A座4层报告厅举行。来自全市大专院校、科研院所及部分中学的140余人到会,并参与了有关活动。     

热心公益事业的医学微生物学家——方纲

<正>方纲,1913年9月20日生于北京,1981年1月7日卒于北京。方纲祖籍福建闽侯(今福州市),祖居福州九彩园。方家是福州大户,人称"九彩园方家",他父亲方石珊是留学日本的著名公共卫生专家,曾在1911年东北鼠疫大流行时协助伍连德从事防疫工作,长期担任中华医学会秘书长、副会长。方纲幼年时,家中为其延师启蒙,完成了学前教育,1921年入北京成达小学高小一年级,1923年小学毕业后,先后在北京志成中学、北京     

从中日候鸟保护协定的签订谈起

中日两国候鸟保护协定,已于1981年3月3日在北京签订了。     

2008北京国际生理科学学术大会圆满召开——生理学在医学中的地位：架设实验室和临床之间的桥梁

在全国上下喜庆中国首次成功举办奥运会后的日子里,中国生理学会与美国、澳大利亚、加拿大和英国的生理学会联合举办的“2008北京国际生理科学学术大会”,于2008年10月19日至22日在北京西郊宾馆顺利召开,并取得了圆满成功。     

2007年中国生理学会北京地区新春联谊会纪实

2007年北京地区新春联谊会于元月27日在北京金汉斯餐饮有限公司召开,北京生理学界20多位同仁参加了此次活动。     

古人类学国际学术讨论会在京举行

<正> 1989年10月19日至24日,近百名国内、外专家、同行会聚京郊房山区,隆重纪念北京猿人第一个头盖骨发现六十周年,并在古人类学方面进行了广泛的学术交流。北京猿人第一个头盖骨化石是由著名科学家裴文中教授在1929年12月2日发     

第四届北京生命科学领域联合年会举行

为了更好地促进生命科学领域跨学科的合作与交流,在北京市自然科学基金委员会和北京市科技协会的支持下,北京生理科学会、北京生物化学与分子生物学会、北京免疫学会、北京遗传学会、北京神经科学学会、北京实验动物学学会、北京环境诱变剂学会、北京微生物学会、北京生物工程学会、中华医学会北京消化分会、北京中关村生物工程和新医药企业协会等机构于2006年2月25日在首都医科大学召开第四届北京生命科学领域联合年会(北京·2006)。会议主题是“生命科学与人类健康”。自2003年以来,北京生命科学领域联合年会已成功举办了三届。会议围绕国…     

大力发展籽种产业带动现代农业发展——第一届生物技术与农业峰会在京召开

“第一届生物技术与农业峰会·北京”于2008年4月25日在北京召开。与会各国专家、政府官员及学者就生物技术与现代农业发展进行了深入探讨。与会专家指出,北京在籽种产业的技术、人才,资源、国际交流等方面具备优势地位,大力发展籽种产业是北京现代农业的必然选择和第一选择,北京应当进一步巩固其国内籽种产业中心和国际交易中心的地位。     

Characteristics of the membranes of the pellicle of the ciliatePseudomicrothorax dubius

Summary The membranes of the pellicle of the ciliatePseudomicrothorax dubius are investigated using thin section electron microscopy and freeze-fracture replicas. The plasma membrane is covered by a surface coat and is connected to the outer alveolar membrane by short, sometimes branched, bridges. The inner alveolar membrane is coated on both sides. The epiplasm lies in intimate contact with the cytoplasmic surface of this membrane, and there is a corresponding deposit on the other surface. This deposit is regularly striated.The epiplasmic layer and the alveoli are interrupted at sites of cytotic activity,e.g., the attachment sites of trichocysts, the cytoproct, and the parasomal sacs. The striated deposit ends where the epiplasm ends, indicating a direct relationship between these two epimembranous layers.There is a deposit along the sides of the first part of the tip of the trichocysts, and in this region the trichocyst membrane is free of intramembranous particles.The membrane of the parasomal sacs has a coat on both surfaces. That on the extraplasmic surface is similar to the surface coat of the plasma membrane. The origin of the cytoplasmic coat is unknown. The cytotic activity of these sacs is indicated by their highly irregular profiles.     

The early development of the tail and the transformation of the shape of the nucleus of the spermatid of the domestic fowl,Gallus gallus

Summary The differentiation of the spermatid, especially in reference to the formation of the flagellum, and transformation of the shape of the nucleus was investigated in the domestic fowl.In the early stage of the spermatid, a prominent Golgi apparatus appears around the centrioles. The Golgi vesicles then surround the axial-filament complex which develops from the distal centriole. These vesicles fuse to form continuous membrane at the earliest stage of flagellar formation, and in the succeeding stage Golgi lamellae are attached to the plasma membrane of the developing flagellum. From these observations, it is assumed that Golgi apparatus may be a source of the membrane system of the flagellum.The microtubules distributed around the nucleus form the circular manchette. The anterior region of the nucleus with the manchette is cylindrical in shape and the posterior region without it remains irregular in shape. When the circular manchette has been completed, the whole nucleus acquires a slender cylindrical shape. The circular manchette then changes into the longitudinal manchette. The nuclei of spermatids without a longitudinal manchette are abnormal in shape. In view of these observations it is assumed that the nuclear shaping of the spermatid may be accomplished by circular manchette and the maintenance of shape of the elongated nucleus by longitudinal manchette.The authors wish to thank Mr. Takayuki Mori for his helpful suggestions and technical advices     

Characterization of the composition of the aqueous humor and the vitreous body of the eye of the frog Rana temporaria L

This study aimed to analyze the aqueous humor (AH) and the vitreous body (VB) of the eye of the adult frog Rana temporaria L. as a representative species of amphibians, which lead a semi-terrestrial life. The presence of collagen, albumin, uric acid and electron donors was shown in both media; however, there are slight differences in their concentrations. To determine collagen, a spectral-fluorescent probe, cyanine dye, was used. The presence of collagen in AH of the frog was found at the first time. The total content of electron donors (ascorbic and uric acids, tryptophan, and tyrosine) in VB and HA was roughly estimated at ~ 1.5 × 10^− 4 mol/L. Both VB and AH absorb light in similar UV regions. The total protein and albumin contents in AH were found to be somewhat higher than those in VB. The uric acid content was at an equally low level in both intraocular media. It is supposed that the similarity of VB and AH compositions shown in this work is due to some exchange between VB and AH contents in the course of accommodation. The role of intraocular fluids in physiological functions of the eye and in protecting the retina against UV light is discussed.     

Observations on the permeability of the choriocapillaris of the eye

Summary The choriocapillaris is a fenestrated capillary bed located posterior to the retinal pigment epithelium. It serves as the main source of supply to the photoreceptors, retinal pigment epithelium, and other cells of the outer retina. The permeability of these capillaries to intravenously injected ferritin (MW — approx. 480,000; mol. diam. 11 nm) was examined in the mouse, rabbit, and guinea pig, each of which is characterized by a different type of retinal vascularization. In all three species, the bulk of the ferritin remained in the capillary lumina, where it appeared to be blocked at the level of the diaphragmed fenestrae. Some ferritin was present in endothelial cell vacuoles. The results confirm previous work on the rat choriocapillaris and indicate that the barrier function of the choriocapillary endothelium is present even among species in which the retinal circulation differs significantly.Supported by NIH grant EY03418