Photorefractive beam coupling in tin hypothiodiphosphate in the near infrared.

Infrared recording of phase gratings is investigated in Sn(2)P(2)S(6) crystals by radiation of a Nd(3+):YAG laser (lambda = 1.06 microm) Space-charge formation and hologram recording are dominated by diffusion charge transport. Without an applied electric field, but with preexposure of the sample to incoherent white light, the gain factor exceeds 6 cm(-1) at laser intensities above 50 W/cm(2).

Factors influencing the formation of methemoglobin in desferrioxamine loaded erythrocytes.

Desferrioxamine (DFO) in therapeutically useful amounts was incorporated into red blood cells (RBC) by means of a dialysis method. Entrapped DFO interacted with hemoglobin which was indicated by the formation of methemoglobin. This process was influenced to a great extent by the duration and temperature of the incubation steps.

A biological oscillator system and the development of sleep-waking behavior during early infancy.

The sleep-waking behavior of a male infant, normal with respect to pregnancy, delivery and Apgar score, was observed continuously from birth till the first 4 months of life. The infant was allowed to sleep and awake according to his own schedule and was fed only if his behavior could be judged as a feeding demand. Using several methods of computerized analysis it could be demonstrated that the spontaneous sleep-waking behavior was mainly driven by two endogenous rhythms, an ultradian cycle and a circadian one.

[Bio-rhythmic as time-structure of postnatal development: observation in behaviour and polygraphic studies in a normal newborn (author's transl)].

The spontaneous sleep-waking behaviour of a male infant, normal with respect to pregnancy, delivery and Apgar score, was observed continuously from birth till the first four months of life. Additionally sleep stages were scored by means of polygraphic method during several weeks. The infant was allowed to sleep and awake according to his own schedule and was fed if his behaviour could be judged as a feeding demand.