Microtubules support nuclear nonproliferation arrangement

Microtubules support nuclear nonproliferation arrangement

Microtubules suppor t nuclear nonproliferation arrangement L aporte et al. describe how a mi-crotubule array reorganizes the nucleus to aid the survival of qui-escent budding yeast. Eukaryotic cells undergo a dramatic rearrangement when they temporarily exit the cell cycle and become qui-escent. Budding yeast, for example, reorganize their actin cyto-skeleton into immobile structures called act...

Economic and Technological Trends Affecting Nuclear Nonproliferation

Stanley A. Erickson received a doctorate in mathematics from the Massachusetts Institute of Technology in 1974 and has been working at Lawrence Livermore National Laboratory since 1977. Until the early 1990s, Mr. Erickson’s work was focused primarily on military devices. More recently, he has been involved in nonproliferation efforts, including nuclear site security, nuclear smuggling preventio...

Nuclear Strategy, Nonproliferation, and the Causes of Foreign Nuclear Deployments

Why do countries deploy nuclear weapons abroad? Since 1945, more than twenty states have hosted foreign nuclear weapons on their territory, and five countries continue to do so today. These deployments have important consequences for international security, yet there is little systematic research about the factors that drive them. In this article, we develop three broad theoretical frameworks t...

The Nuclear Nonproliferation Regime and Nuclear Realities: Repair or Reassessment?

Arrangement of subunits in flagellar microtubules.

Electron micrographs of outer doublet tubules from flagella have been analysed by methods which make use of the computed diffraction patterns of electron-microscope images. Analysis of singlet A-tubules in the tips of flagella has led to a determination of the helical surface lattice of the A-subfibre, confirming that there are 13 longitudinal protofilaments in the tubule wall and that dimers i...