Ontogenic development and anatomical distribution of a supernumerary limb-inducing factor

. .

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This work was supported by a Rackham Grant from the University of Michigan.     

Wirkung von 6β-Methoxy-9β,10α-pregna-4,6-dien-3,20-dion

Summary 6-Methoxy-9,10 -pregna-4,6-diene-3,20-dione inhibites the ⁴-3-oxosteroid-5-reduction in microsomes and the ⁴-3-oxosteroid-5-reduction in the soluble fraction of male rat liver. The 3- and 3-hydroxysteroid dehydrogenase are not inhibited by this substance.

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Diese Arbeit wurde von der Firma Hoffmann-La Roche, Basel, unterstützt.     

Inhibition of EMC virus reproduction and prevention of cell death by amino acid analogues and puromycin

L- , .D, L--2- (, 50%). , , . , .     

Magnug reflexex of the chest musculature in man

, , .     

Mass spectrometric determination of the amino acid sequence in peptides: Desulfurization of sulfur-containing peptides

, N- 20 - .     

IdentifyingY chromosome in interphase nuclei of the human brain

. . . -- , - .     

X-ray research of polycrystals. X-ray diffraction methods for precision determinations of polycrystal lattice parameters over unsolved double lines

. - .     

A study of the mechanism of lowering the sensitivity of smooth muscle to noradrenalin with sympathetic hyperinnervation

, , , , . . , .     

Isoforms of baker's yeast transketolase

. .     

The tonically acting pulmonary receptors innervated by C fibres

. , , , , . (, ) . . .     

Axillary 5α-androst-16-en-3-one in men and women: Relationships with olfactory acuity to odorous 16-androstenes

Summary Axillary 5-androst-16-en-3-one (5-androstenone) levels were found to be significantly higher in men than in women but do not vary between left and right axillae, are not related to age, handedness or degree of hirsutism (in women) nor to anosmia to this steroid. In men (but not in women), levels are related linearly to axillary cholesterol concentrations but not to squalene. Olfactory thresholds for 5-androstenone varied widely, the lowest recorded being 0.2 ppb, but there was no difference in thresholds between men and women. Women (70%) found the smell repellant but anosmia did not differ greatly between men and women (9–20%). Anosmia to the smell of 5-androst-16-en-3-ol was most marked in women (90%) rather than in men (45%). Axillary 5-androstenone values were generally consistent with the musky or strong smells of male axillary extracts, compared with the sweet smell of those from female subjects.Supported by the Herbert Dunhill Trust.     

Changes in the lumen of coronary vessels under oligemic hypotension

Conclusions The decrease of circulating blood volume, resulting in oligemic hypotension, may evoke in anaesthetized cat the active constrictory coronary vessel responses of 2 types, one occuring immediately after start of the hypotension and the other having a significantly prolonged latency.

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, , , , ( 4 ), ( 45 ).

     

Paul Ehrenfest on the Necessity of Quanta (1911): Discontinuity,Quantization, Corpuscularity,and Adiabatic Invariance

Our object in this paper is to study the antecedents, contents, implications, and impact of a not well-known or appreciated paper by EHRENFEST in 1911 on the essential nature of the different quantum hypotheses in radiation theory. After a careful analysis of EHRENFESTs notebooks, correspondence, and publications, we conclude that the essential points of EHRENFESTs paper were not perceived to a large extent, and hence that its implications were not considered thoroughly. Specifically, we show that EHRENFEST contributed significantly to the clarifications of the differences between PLANCKs and EINSTEINs respective quantum hypotheses, as well as to those of the concepts discontinuity, quantization, and corpuscularity.     

Il punto nella terminologia matematica greca

Summary In this note we claim that the two words and , which were used in Greece to indicate the geometrical point, had both been introduced in the scientific language in the first half of the IV^th century B.C., and that they became popular independently of each other in two different cultural circles, those of philosophy and of mathematics, respectively.We propose therefore, in contrast to a conjecture by Heiberg, a new explanation for the predominance of during the golden age of Greek mathematics and for the resurgence of during the period of decadence.

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Memoria presentata da A. Seidenberg     

The stimulating action of gastrin pentapeptide,histamine and cyclic adenosine 3′,5′-monophosphate on carbonic anhydrase in rat stomach

, 3,5- . , , , , 3,5-.

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With the technical assistance ofYu. M. Konstantinov andT. V. Zymonina.     

Study of the relationship between the magnitude of biological activity and the structure of aliphatic compounds

Zusammenfassung Es wurde festgestellt, dass die experimentellen Daten der sogenannten physikalischen Toxizität von aliphatischen Verbindungen die Gleichung log ( _i/ _Ät)= erfüllen, wo _iund _Ät die Grösse der biologischen Wirkung des i-ten Derivats und des Äthylderivats bezeichnen und und die Konstanten sind. Die Bedeutung der beiden Konstanten wurde erwähnt.     

Chromosomes and giemsa-bands of the Idaho spotted ground squirrel,Spermophilus brunneus (Howell)

-Spermophilus brunneus . , 13 18 ,S. brunneus S. townsendii mollis (2n=38) , , ; ;S. brunneus . S. brunneus , Spermophilus.

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Supported by National Science Foundation Grants No. GB32114X and No. GB 29131X, and the Sprague Foundation. We thankD. Pozin for technical assistance.     

Chromosomes and some issues of the evolution of the ground squirrel genusCitellus (Rodentia: Sciuridae)

Citellus (s. str.) relictus, C. dauricus C. pygmaeus (2=36, NF=72). . (Colobotis) erythrogenys . fulvus -. . (Urocitellus) undulatus (2n=32, NF=64) . columbianus. Citellus, , Citellus, . , .     

The role of the pentose-phosphate pathway in adjustment of the heart to a high load and the development of myocardial hypertrophy

, , - - - . .     

Contribution to the X-ray diffraction methods for precision determinations of polycrystal lattice parameters

. . : , . u-, .