On the presence of multivesicular bodies inLeishmania donovani

Riassunto Nel presente lavoro gli autori hanno riferito la presenza di corpi multivescicolari inLeishmania donovani. Le vescicole di questi corpi si formano nei vacuoli dell'apparato di Golgi. Le immagini al microscopio elettronico mostrano chiaramente i segni dell'attività litica dei corpi multivescicolari.     

String dualities and empirical equivalence

String dualities establish empirical equivalence between theories that often look entirely different with respect to their basic ontology and physical structure. Therefore, they represent a particularly interesting example of empirical equivalence in physics. However, the status of duality relations in string physics differs substantially from the traditional understanding of the role played by empirical equivalence. The paper specifies three important differences and argues that they are related to a substantially altered view on the underdetermination of theory building.     

On the relationship between glucagon and secretin

Zusammenfassung Die Polypeptidhormone Glukagon und Sekretin wurden auf der Basis des genetischen Codes verglichen. Es wurde daraus geschlossen, dass die beiden Substanzen ursprünglich von einem gemeinsamen Gen erzeugt wurden.

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This investigation was supported by the National Science Foundation (No. GB-3208) and the National Institutes of Health (No. AM 10671-01).     

Hydrogen peroxide and Heinz bodies

Zusammenfassung In den mit Cyanid vergifteten Erythrozyten produziert das exogene H₂O₂ bei geeigneter Temperatur Heinzsche Körperchen. Die Bildung der Heinzschen Körperchen, ihre Anzahl und Grösse ist von Temperatur und Cyanid-Konzentration abhängig.     

Spinoza on the resistance of bodies

Commentators often claim that the bodies of Spinoza’s physics resist the changes they undergo. But it’s not always clear what they mean when they say this, or whether they are entitled to say it. This article clarifies what it might mean to for Spinoza’s bodies to resist change, and examines the evidence for such a view. In the first half, the author argues that there is some limited evidence for such a view, but not nearly as much as people think. In the second half, the author proposes looking for a mental analogue to collision in the realm of ideas and argues that adequacy amounts to a meaningful concept of resistance in Spinoza, albeit one that is incomplete.     

On the association between lysogeny and carcinogenicity in nitroquinolines and related compounds

Zusammenfassung In einer Serie von 16 Nitroquinolinen und verwandten Substanzen wurde eine gute Übereinstimmung zwischen Phageninduktion inEscherichia coli C-600 und Karzinogenese nachgewiesen.

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Supported by grants No. C-6516 and FR-05526 from the National Cancer Institute and Contract NO. PH 86-66-169 from the Division of Air Pollution, U.S.P.H.S. We thank Dr.Y. Kawazoe of the National Cancer Center Research Institute, Tokyo, for his generous gift of the compounds tested.