An Easily Made Observation

An Easily Made Tissue Culture Perfusion Chamber

A perfusion chamber is described with which a tissue culture can be irrigated successively with different immersion media. Only 1-2 ml. of medium are required for each change, which can be accomplished within 1 minute. Simplicity of design permits speed and economy in manufacture. Perfusion by suction instead of by positive pressure has eliminated certain drawbacks of previous designs. Mixing e...

An easily made, low-cost, tissue-like ultrasound phantom material.

Ultrasound phantoms are generally of two types. One mimics the acoustic properties of tissue (with regard to the speed of sound, average attenuation, etc.). The main purpose of the other is to approximate the sonographic appearance of tissue. The latter is often used as a biopsy training aid. Those which mimic the acoustic properties of tissue have been constructed of agar with suspended graphi...

Design and use of easily made RNA size markers.

Heterometallic rings made from chromium stick together easily.

The idea that coordination complexes could be used in quantum information processing (QIP) was introduced by Leuenberger and Loss, and later developed by them and others. Our contribution has been to look at the S= =2 ground state {Cr7Ni} anti-ferromagnetically coupled rings, [4,5] including measuring spin coherence times. For QIP to work there is a need to link such rings into more sophisticat...

Experimental observation of an extremely dark material made by a low-density nanotube array.

An ideal black material absorbs light perfectly at all angles and over all wavelengths. Here, we show that low-density vertically aligned carbon nanotube arrays can be engineered to have an extremely low index of refraction, as predicted recently by theory [Garcia-Vidal, F. J.; Pitarke, J. M.; Pendry, J. B. Phys. Rev. Lett. 1997, 78, 4289-4292] and, combined with the nanoscale surface roughness...