The protection of mice against experimental infection by means of immunization with enriched membrane fraction ofSalmonella typhimurium

Riassunto Topi immunizzati con membrane isolate daSalmonella typhimurium presentano una resistenza alla infezione sperimentale uguale a quella dimostrata da topi immunizzati conSalmonelle viventi.     

Isolation procedure for bovine retinal rod outer segments

Summary An isolation procedure to obtain rod outer segments from cattle retinas is reported. Centrifugation of homogenates in discontinuous and continuous sucrose density gradients yields purified photoreceptor cell outer segments. Assay of the final preparation for rhodopsin content gives a ratio of 2.4 for DO_{280 nm}/DO_{498 nm}.