A storage stable Lowenstein-Jensen medium is prepared by freeze drying the liquid medium to provide a powder having a moisture content of less than 8% by weight. The dried powder is stable at ambient temperature for at least one year and may be easily reconstituted to the fluid Lowenstein-Jensen medium by simple mixing at ambient conditions.
This is a continuation-in-part of pending U.S. application Ser. No. 659,703, filed on Feb. 20, 1976, now U.S. Pat. No. 4,072,570, which is in turn a continuation of application Ser. No. 243,078, filed on Apr. 11, 1972, now abandoned.
The present invention relates to a method for improving the growth and detection of bacteria, yeasts, fungi or cocci, by adding sterile-filtered yeast extract and/or p-iodonitrotetrazolium violet to the culture medium.
A blood chemical sensor has a blood gas sensitive dye contained in a hydrogel matrix, the combination of dye and gel being mounted on the end of an optical fiber. The hydrogel is freeze-dried to facilitate packaging and handling.
