Thermoelectric-cooled liquid bath chiller capable of unattended operation at -28 °C.

Using thermoelectric elements, we have developed a simple liquid bath chiller that is inexpensive and easy to fabricate. Typically, small experimental apparatus can be cooled using a liquid cold bath. These cold baths require continuous addition of a coolant such as dry ice or liquid N to maintain the desired temperature, which becomes tedious during long experiments.

Energy transfer properties of Rhodobacter sphaeroides chromatophores during adaptation to low light intensity.

Time-resolved fluorescence spectroscopy was used to explore the pathway and kinetics of energy transfer in photosynthetic membrane vesicles (chromatophores) isolated from Rhodobacter (Rba.) sphaeroides cells harvested 2, 4, 6 or 24 hours after a transition from growth in high to low level illumination. As previously observed, this light intensity transition initiates the remodeling of the photosynthetic apparatus and an increase in the number of light harvesting 2 (LH2) complexes relative to light harvesting 1 (LH1) and reaction center (RC) complexes.

Serological typing of Ureaplasma urealyticum isolates from urethritis patients by an agar growth inhibition method.

An agar growth inhibition method for serotyping Ureaplasma urealyticum is described, and the results of applying this method to serotyping 338 strains of the organism are presented. The serotyped strains consisted of cloned isolates from male patients with primary and recurrent nongonococcal urethritis (NGU), isolates from symptomatic patients with other genitourinary tract infections and disorders, and isolates from asymptomatic carriers of U. urealyticum in the genitourinary tract (controls).

Differential agar medium (A7) for identification of Ureaplasma urealyticum (human T mycoplasmas) in primary cultures of clinical material.

A differential agar medium for the identification of Ureaplasma urealyticum in primary cultures of clinical specimens is described. The differential medium (no. A7) is specific for the identification of U.

Unusual colonies of Ureaplasma urealyticum (T mycoplasmas) in primary agar cultures of certain urine specimens.

The existence of unusual colonies of Ureaplasma urealyticum (T mycoplasmas) in primary agar cultures of certain urine specimens is reported and their morphology is illustrated.