Agrobacterium tumefaciens grows by addition of peptidoglycan (PG) at one pole of the bacterium. During the cell cycle, the cell needs to maintain two different developmental programs, one at the growth pole and another at the inert old pole. Proteins involved in this process are not yet well characterized. To further characterize the role of pole-organizing protein A. tumefaciens PopZ (PopZ At ...

A method for producing a radar-reflectivity map of the polar regions of the Moon or a planet from polar orbit with only the frequency shift of the reflected signals is described and simulated. A Radon transform of the reflectivity is obtained during multiple passes over the pole. Inversion of this Radon transform enables a map of radar reflectivity to be synthesized.

Polar body emission is a specialized cell division throughout the animal kingdom, serving to reduce chromosome ploidy while preserving the egg cytoplasm. Critical to polar body emission are the asymmetric positioning of the meiotic spindle prior to anaphase, with one pole attached to the oocyte cortex, and the simultaneous membrane protrusion during subsequent cytokinesis. We have shown that, d...

Entry into sporulation in Bacillus subtilis is characterized by the formation of a polar septum, which asymmetrically divides the developing cell into forespore (the smaller cell) and mother cell compartments, and by migration of replication origin regions to extreme opposite poles of the cell. Here we show that polar septation is closely correlated with movement of replication origins to the e...

Images of Neptune obtained in 2006 at ESO’s Very Large Telescope (Orton et al., 2007, Astronomy & Astrophysics 473, L5) revealed a near-polar hot spot near 701S latitude that was detectable in filters sampling both stratospheric methane (7 mm) and ethane ( 12 mm) emission. Such a feature was not present in 2003 Keck and 2005 Gemini North observations, which showed only a general warming trend t...

Abstract We report the discovery of a cold stream near southern Galactic pole (dubbed as SGP-S) detected in Gaia Early Data Release 3. The is at heliocentric distance ?9.5 kpc and spans nearly 58° by 0.°6 on sky. color–magnitude diagram SGP-S indicates an old metal-poor (age ?12 Gyr, [M/H] ? ?2.0 dex) stellar population. stream’s surface brightness reaches exceedingly low level ? G ? 36.2 mag a...

Abstract The Juno mission to Jupiter has found closely packed cyclones at the planet’s two poles. observation that these coexist in very confined space, with outer rims almost touching each other but without merging, poses a big puzzle. In this work, we present numerical calculations showing convectively sustained, can form and survive merging for long time polar region of deep rotating convect...

Localization of mRNA is a well-described mechanism to account for the asymmetric distribution of proteins in polarized somatic cells and embryos of animals. In zygotes of the brown alga Fucus, F-actin is localized at the site of polar growth and accumulates at the cell plates of the first two divisions of the embryo. We used a nonradioactive, whole-mount in situ hybridization protocol to show t...

Localization of mRNA is a well-described mechanism to account for the asymmetric distribution of proteins in polarized somatic cells and embryos of animals. In zygotes of the brown alga FUCUS, F-actin is localized at the site of polar growth and accumulates at the cell plates of the first two divisions of the embryo. We used a nonradioactive, whole-mount in situ hybridization protocol to show t...

Auroral emissions have been extensively observed at the Earth, Jupiter, and Saturn. These planets all appreciable atmospheres strong magnetic fields, their auroras predominantly originate from a region encircling each pole. However, Jupiter’s poleward of these “main” are brighter more dynamic, drivers responsible for much mysterious polar eluded identification to date. We propose that part solu...