Die Dosiswirkungsfunktion im Ertragsgesetz

Zusammenfassung Die verschiedenen schon früher publizierten Versuche der kausalen Deutung des Ertragsgesetzes beim Pflanzenwachstum wurden unter einen einheitlichen Gesichtspunkt gestellt, wobei von den in der Strahlenbiologie geläufigen Vorstellungsbildern ausgegangen wurde.     

On orderly domains of particles associated with cytomembranes during spermatogenesis in Helix aspersa

Summary In an electron microscopic study of the maturation of the spermatid of the snail Helix aspersa, it was found that: 1. there is persistence and utilization of the mitochondrial architecture in the formation of the middle piece, and 2. particles originate in orderly domains within the pseudomatrix of the mitochondria. Other orderly domains of cytomembranes (Golgi system and peripheral tubules of Grassé) are discussed.Dedicated to Professor Friedrich Wassermann with admiration and affection on the occasion of his eightieth birthday.Work supported by U.S. Atomic Energy Commission.     

Zur Kenntnis der sogenannten Glucoseoxydase

Ohne Zusammenfassung     

Artificial Cardiac Pacemakers

Nine patients with complete heart block and Stokes-Adams disease were treated with subcutaneously implanted, fixed-rate, artificial cardiac pacemakers. All of these patients were refractory to medical treatment and confined to bed by the frequency of their attacks. One patient died in uremia one month after operation; in the remaining eight, the implanted pacemakers are providing adequate stimulation at present. These patients are free of seizures and show an improvement in the amount of their physical activity. A fixed rate of 60 to 65 per minute was adequate in all cases. The results of our clinical experience with cardiac pacemakers is satisfactory, but the possibility of mechanical failure limits their use to situations in which the patient is incapacitated despite medical treatment.