منابع مشابه
Tearing down the spindle
isassembly of the mitotic spindle takes some effort, according to Kan Cao, Yixian Zheng (Johns Hopkins University, Baltimore, MD), and colleagues, who show that an ATPase and its binding partners pull apart the spindle. The spindle is put together by assembly factors that are activated by the cyclin-dependent kinase Cdc2. The loss of Cdc2 activity at the end of mitosis has thus been the convent...
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Recent advances in scale-free networks have claimed that their topologies are very weak against attacks. The inhomogeneous connectivity distribution of large-scale current communication networks, such as the Internet, could be exploited by evil hackers in order to damage these systems. However, there have not been many studies on the approaches and consequences of such targeted attacks. In this...
متن کاملTearing down actin
n page 987, Yu et al. identify a novel cell death pathway that bypasses mito-chondria. The results indicate that various strategies exist to kill off neurons. A lot of the killing of sympathetic neurons occurs in the first week after birth. During that paring period, ف 50% of sympathetic neurons die due to a lack of nerve growth factor (NGF). Neurons deprived of NGF in vitro die through the c...
متن کاملTearing down the façades of radical innovation
a r t i c l e i n f o Managers construct organizational façades that mislead external stakeholders, organizational members, auditors, researchers, other managers, and even themselves (Nystrom & Starbuck, 1984). Very little empirical research has been conducted on how managers build these façades since Nystrom & Starbuck's first influential article. This paper reports on the creation of an organ...
متن کاملFishing down the deep
A global crisis in marine fisheries was regarded with scepticism by many fisheries scientists as recently as 10 years ago. Today, however, few dispute worrying trends [Pitcher and Pauly 1998; Pitcher 2001; Pauly et al. 2002; Christensen et al. 2003; Hilborn et al. 2003; Pauly and Maclean 2003; Food and Agriculture Organization (FAO) 2004]. Historical data from marine ecosystems clearly suggest ...
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ژورنال
عنوان ژورنال: Science
سال: 2003
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.300.5628.2005e