Polarized expansion of root hair cells in Arabidopsis thaliana is improperly controlled in root hair-defective rhd4-1 mutant plants, resulting in root hairs that are shorter and randomly form bulges along their length. Using time-lapse fluorescence microscopy in rhd4-1 root hairs, we analyzed membrane dynamics after labeling with RabA4b, a marker for polarized membrane trafficking in root hairs...

Previous reports have suggested that the sparsely distributed hairs found on the entire postcranial body of sirenians are all sinus type tactile hairs. This would represent a unique arrangement because no other mammal has been reported to possess tactile hairs except on restricted regions of the body, primarily the face. In order to investigate this issue further, hair counts were made systemat...

Relatively little is still known about the sense of taste, or contact chemoreception, compared with other sensory modalities, despite its importance to many aspects of animal behaviour. The central projections of the sensory neurons from bimodal contact chemoreceptors (basiconic sensilla) were compared with those from mechanosensory tactile hairs located on similar regions of the middle leg of ...

Bumblebees (Bombus terrestris) use information from surrounding electric fields to make foraging decisions. Electroreception in air, a nonconductive medium, is a recently discovered sensory capacity of insects, yet the sensory mechanisms remain elusive. Here, we investigate two putative electric field sensors: antennae and mechanosensory hairs. Examining their mechanical and neural response, we...

Area affected. Duration. Hairs only. (a) Hairs. Final species identification. Degree of Possible contact with Brilliant green Small or large inflammatory infected animals. fluorescence spored. reaction present. with microsporum Possible contact with infections. Endo or other infected patients Ectoendothrix (a) within the family. Diagnostic blue-green organisms. (b) in small localities. fluoresc...

Nuclear dynamics in root hairs, which depends upon the actin cytoskeleton, appears to be an important factor in root-hair tip growth. Previous evidence suggests that there is an absolute requirement for the nucleus to be a fixed distance from the growing root-hair tip for tip growth to proceed. To test this hypothesis, nuclear dynamics were examined in root-hair cells bearing multiple root hair...

It is impossible to comb all the hairs of a fuzzy ball so that: i) each hair lies tangent to the surface of the ball, and ii) the angles of the hairs vary continuously over the surface of the ball. (By this we mean that the angle between two hairs at positions p and q say can be made arbitrarily small by choosing q sufficiently close to p.) Any attempt to accomplish this feat must produce a cow...

Hairs varying from 6 to I2 in. in length were obtained mostly from women and in some cases from Sikh male members of the department. The hairs selected, after brittle, coarse, or extremely thin hairs had been discarded, were cleaned with 2 per cent. cetavlon, washed in water, wrapped around rubber tubing about 3 in. long to minimize curling, put into a wide-mouthed bottle, and autoclaved for 20...