Kick out the reticulons to close the envelope The nuclear envelope reforms when tube-forming reticulons are ejected from chromatin-associated ER tubules, say Anderson and Hetzer. The nuclear envelope was once thought to disintegrate into vesicles during mitosis, but growing evidence suggests it is absorbed into the endoplasmic reticulum. Recent in vitro experiments by these authors have shown t...

Kick out the reticulons to close the envelope The nuclear envelope reforms when tube-forming reticulons are ejected from chromatin-associated ER tubules, say Anderson and Hetzer. The nuclear envelope was once thought to disintegrate into vesicles during mitosis, but growing evidence suggests it is absorbed into the endoplasmic reticulum. Recent in vitro experiments by these authors have shown t...

Cutaneous inverted papillomas are described in an 8-month-old mixed breed domestic dog from Windhoek, Namibia. Multiple firm, rapidly growing, doughnut-shaped masses formed on the ventral abdomen, which histologically consisted of a cup-shaped rim of marked epithelial hyperplasia, giant keratohyaline granules and prominent koilocytes and marked hyperkeratosis filling the centre of the mass. Cur...

Toroidal-spiral (TS) particles, with large surface-to-volume ratio and well-defined internal channels, were recently generated by a novel process of flash solidification of polymeric droplets during their sedimentation in a miscible solution. TS particles have an overall doughnut or toroidal shape and a thin spiral-shaped channel near the surfaces (Fig. 1a). Entrainment of the bulk solution wit...