Cell-free transmission of lymphosarcoma in the northern pikeEsox lucius L. (Pisces; Esocidae)

Zusammenfassung Beim HechtEsox lucius L. liess sich ein Lymphosarkom durch zellfreie Filtrate übertragen und damit die Virus-Aetiologie nachweisen.     

哪些基因造就了人类

数十年前科学家就已经知道,人类基因至少有98％和黑猩猩完全相同……现在才开始探寻使人类从猿类中分离出来的究竟是哪些基因。人总喜欢认为自己是特殊的。因为人类具有交谈、书写和建筑复杂构造的能力,从而把自己从动物王国中分开来,并且形成精神上的差别。但是,将其归结到基因时,人类又和黑猩猩的两个物种极其相似,以至于生理学家贾里德·戴蒙德（JaredDiamond）称我们人类是“第三个黑猩猩物种”。经过了四分之一世纪的研究工作,可以肯定地确认人类和黑猩猩的任何基因组区,至少有98．5％的DNA是相同的。这就意味着只有很少一部…     

Patterns of neuroglial proliferation in spinal cord white matter following exposure to ionizing radiation

Summary X-irradiation temporarily decreases the proliferative activity of neuroglia in immature rat spinal cord. Later, the proliferative activity in these irradiated regions surpasses that noted in control rats. Areas adjacent to the irradiated region have a greater than normal percentage of labelled neuroglia and may also be a source for neuroglia which re-populate the irradiated zone.Acknowledgments. Sincere thanks to Ms Jane Leiting for her assistance in doing the cell counts and to Mr Napoleon Phillips for preparing the autoradiographs. Supported by USPHS grant NS 04761.