A microspectrophotometric study of normal and artificial visual pigments in the photoreceptors ofXenopus laevis

Absorbance spectra of visual pigments in theXenopus retina were obtained by microspectrophotometry. Principal rods contained a pigment with peak absorbance of 524 ± 2nm. A minority of rods contained a pigment with λ_max at 445 ± 6nm; single cone spectra peaked at 611 ± 4nm.Xenopus tadpoles were maintained on a Vitamin A-free diet for 6–8 weeks, then injected systemically with all-trans retinol or 9-cis retinal. In the principal rod, these resulted in pigments peaking at 511 ± 3nm and 498 ± 2nm, respectively. The normally encountered Vitamin A₂-based pigment of the principal rod had a broader half-width than its Vitamin A₁-based analog. In single cones, all-trans retinol led to the formation of a pigment with λ_max 578 ± 7nm. The substantial shifts seen in the wavelengths of peak absorbance as well as in the shapes of the spectral curves following administration of retinol or 9-cis retinal indicate that at least most of the normally encountered Vitamin A₂-based pigment was replaced by a Vitamin A₁-based pigment.     

Studien über Komplikationen der Lungentuberkulose und über die Verbreitung der Tuberkelbazillen in den Organen und im Blut der Phthisiker

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Über Myosalvarsandermatitis und Encephalopathie

Zusammenfassung Beschreibung und Besprechung eines Falles von Schädigung durchMyosalvarsan, in welchem es zum Auftreten einer schwerenSalvarsandermatitis und im Anschluß daran einertödlichen Salvarsanencephalopathie kam. Die Untersuchung desZentralnervensystems ergibt den eigenartigen Befund einerschweren isolierten Gliaschädigung.     

Zur Frage der Sinusthrombose nach Freilegung des gesunden Sinus

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Das histologische Bild der Ringlinie Safar's

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