Water compartments in the myelinated nerve. III. Pulsed NMR results.

3 experimentally distinct transverse relaxation components of the water in frog sciatic nerve are obtained by Carr-Purcell-Meiboom-Gill technique. The relative weights of these components: approximately 29%; approximately 50%; approximately 21% fit well with water compartments in this tissue as revealed by previous methods.     

Aging of the erythrocyte. III. Cation content

Summary Studies on the main cation content of density-separated bovine erythrocytes showed a progressive decrease in the levels of K⁺ and Mg²⁺ with increasing cell density (and age) accompanied by an increase in the level of Na⁺. The magnitude of net cation loss corresponded to that of red cell volume decrease, but could not account for the total increase in the microviscosity of the erythrocyte interior.     

Electrophoresis of the venom and haemolymph of the scorpionButhus Judaicus E. S.

Zusammenfassung Die elektrophoretische Analyse des Skorpiongiftes vonButhus judaicus E. S. ergab den Gehalt von mindestens 6 Proteinfraktionen. Drei dieser Fraktionen waren bei pH 8,6 von kathodischer Beweglichkeit und von offenbar höchster Toxizität. Davon völlig verschieden war das elektrophoretische Bild der Eiweisse in der Skorpionhämolymphe.     

The portraiture of the honourable Robert Boyle,F.R.S.

“To whom is the Consecration of Medal, Stature or even Pyramid more jusly due, than to … the late Illustraious Boyle? … for the happy Improvement of Otto Guericks Magdeburg Exhausterm and for his Profound and Noble Researches into all the abstruser Parts and Recesses of the most useful Philosophy … I have named the Illustrious Boyle, and fix his Trophy here.”

John Evelyn, Numismata, 1697.

     

Aging of the erythrocyte. XV. Isoosmotic lysis times

Summary Isoosmotic lysis times of various density (age) fractions of human, pig and ox erythrocytes in glycerol and ammonium chloride solutions decreased with increasing cell density.I am indebted to Prof. W. Leyko for many stimulating discussions.     

Remarks on the karyotype of the polypteriformes. The chromosomes ofPolypterus delhezi,P. endlicheri congicus andP. palmas

Summary The chromosomes of 3 species of bikirs (Polypterus delhezi, P. endlicheri congicus andP. palmas) were studied in somatic metaphases. The diploid number was found to be 2 n=36 in all the species and a basic morphological identity of the karyotype emerges from karyogram comparison not only in the 3 species described herein, but also in the other Polypteriformes already studied.     

J. L. Lagrange's changing approach to the foundations of the calculus of variations

Archive for History of Exact Sciences -     

Quaternary alkaloid of the bark ofAlstonia venenata R. Br.

Zusammenfassung Ein aus der Rinde vonAlstonia venenata isoliertes quartäres Alkaloid wurde als 3-Dehydroalstovenin identifiziert.     

Investigations on the turnover of adrenocortical mitochnodria. VII. Effects of ACTH on the half-life of mitochondria from the zona reticularis of the rat adrenal cortex.

The half-life of mitochondria from the zona reticularis of the rat adrenal was calculated by determining the radioactivity decay curves of the mitochondrial compartment of 3H-thymidine-injected animals, using autoradiographic methods. ACTH was found to enchance significantly the half-life of the organelles.     

The subcommissural organ of the lizardLacerta s. sicula raf. ultrastructure during the winter

Summary The secretory activity of the SCO cells ofLacerta s.sicula Raf. is strongly reduced during the winter. Such reduction is documented by the decrease of the number of secretory granules type A and B described in previous papers in the summer SCO cells. Also the sacks of RER filled with electron-dense material (type C secretion) are very few; in their place there are, in the basal region of the cells, large vacuoles. In the distal region of the cells, at the free cell surface, a pronounced increase in the number of microvilli is noticed.