RESUMEN
The paper deals with the results of designing highly effective semi-conductor red and infrared radiators based on the multitransient double heterostructures in the Ga1-xAlxAs system and structures in the GaAs:Si, which are designed for oximetry, and presents a small-sized (2.5 x 2.5 x 2.4 mm) unit with flexible terminals. The emissive power was as great as 1.3 mW at 10 mA at lambda max 660 +/- 10 nm in the red band and 1.2 mW at lambda max 925 +/- 10 nm and 2.5 mW at lambda max 870 +/- 20 nm in the infrared band. The radiators described have wide prospects for practical application to oximeters and other medical equipment.
Asunto(s)
Rayos Infrarrojos , Oximetría/instrumentación , Radiación , HumanosRESUMEN
Ubiquinone-9 and ergosterol were extracted with hexane from the yeast Candida paralipolytica after hydrolysis with KOH in EtOH with the yield 0.026 and 0.14%, respectively. Ubiquinone-9 was purified by chromatography and recrystallization from absolute alcohol.
Asunto(s)
Candida/metabolismo , Ergosterol/aislamiento & purificación , Ubiquinona/aislamiento & purificación , Cromatografía en Capa Delgada/métodos , CristalizaciónRESUMEN
The content of ubiquinones (Co Q) of the Astasia longa and Crithidia oncopelti protozoa was studied. The protozoa were grown on an artificial nutrient broth. The cells were separated, washed, freeze-dried, and refluxed with KOH and pyrogallol in ethanol media. The hydrolyzate was concentrated. The residue was stored at -20 degrees and filtered. An ubiquinone fraction was isolated from the filtrate by TLC on silica gel. Identification of the ubiquinone homologues was carried out by reverse phase TLC and mass spectrometry. Ubiquinones were quantitated with respect to the difference in the density between the oxidized and reduced forms of Co Q at 275 nm. The A. longa and C. oncopelti flagellates were shown to contain ubiquinone-9 (Co Q9) at a concentration of 0.48 and 1.14 mumole/g dry cells, respectively. The higher Co Q level in zooflagellates as compared to that in phytoflagellates is discussed.