The use of phage SP50 as marker for cell wall containing teichoic acid in Bacillus subtilis showed clear differences in the rates at which new wall material becomes exposed at polar and cylindrical regions of the wall, though the poles were not completely conserved. Following transition from phosphate limitation to conditions that permitted synthesis of teichoic acid, old polar caps fairly rapi...

M s. Abstract. The quantitative determination of textures is often required in both research and production. The author describes a device, developed at the Metaalinstituut TNO, to be used with an x-ray texture goniometer for the automatic recording of pole figures. 1. Introduction When the crystals of a solid are not randomly oriented, their crystallographic axes tend to be concentrated about ...

Initial images of Venus's south pole by the Venus Express mission have shown the presence of a bright, highly variable vortex, similar to that at the planet's north pole. Using high-resolution infrared measurements of polar winds from the Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument, we show the vortex to have a constantly varying internal structure, with ...

Many prokaryotic protein complexes underlie polar asymmetry. In Caulobacter crescentus, a flagellum is built exclusively at the pole that arose from the previous cell division. The basis for this pole specificity is unclear but could involve a cytokinetic birth scar that marks the newborn pole as the flagellum assembly site. We identified two developmental proteins, TipN and TipF, which localiz...

Originally described in crane-fly spermatocytes, tethers physically link and transmit force between the ends of separating chromosomes. Optical tweezers and laser scissors were used to sever the tether between chromosomes, create chromosome fragments attached to the tether which move toward the opposite pole, and to trap the tethered fragments. Laser microsurgery in the intracellular space betw...

The importance of the photon-photon pair production process (γ + γ′ → e+ + e−) to form pair production cascades in pulsar polar caps is investigated within the framework of the Ruderman-Sutherland vacuum gap model. It is found that this process is unimportant if the polar caps are not hot enough, but will play a non-negligible role in the pair formation cascades when the polar cap temperatures ...

Chemotaxis proteins organize into large, highly ordered, chemotactic signaling arrays, which in Vibrio species are found at the cell pole. Proper localization of signaling arrays is mediated by ParP, which tethers arrays to a cell pole anchor, ParC. Here we show that ParP's C-terminus integrates into the core-unit of signaling arrays through interactions with MCP-proteins and CheA. Its intercal...