BANDING STUDIES IN THE VOLCANO RABBIT, ROMEROLAGUS DIAZI AND CRAWSHAY'S HARE LEPUS CRAWSHAYI. EVIDENCE OF THE LEPORID ANCESTRAL KARYOTYPE

1981 ◽  
Vol 23 (3) ◽  
pp. 469-474 ◽  
Author(s):  
T. J. Robinson ◽  
Frederick F. B. Elder ◽  
W. Lopez-Forment
Keyword(s):  
North American ◽  
Banding Pattern ◽  
Constitutive Heterochromatin ◽  
Chromosome Morphology ◽  
Evolutionary Origin ◽  
Ancestral Karyotype ◽  
Remarkable Similarity ◽  
Common Evolutionary Origin ◽  
The North

G- and C-banded karyotypes are presented for the North American volcano rabbit, Romerolagus diazi (Ferrari-Perez, 1893) and an African hare species, Lepus crawshayi (de Winton, 1899). Both species are characterized by 2n = 48. While noticeable differences in the amounts of constitutive heterochromatin between the two taxa are apparent, the remarkable similarity of both chromosome morphology and G-banding pattern indicates a common evolutionary origin of the two genera. These observations support the hypothesis that the leporid ancestral karyotype has been maintained in the hares and certain of the rabbit taxa.

CHROMOSOME MORPHOLOGY OF THE NORTH AMERICAN SPECIES OF ACTAEA (RANUNCULACEAE). I

1966 ◽  
Vol 44 (10) ◽  
pp. 1231-1234 ◽  
Author(s):  
Shoichi Kawano ◽  
James M. Kane ◽  
Hugh H. Iltis
Keyword(s):  
North American ◽  
Secondary Constriction ◽  
Distinct Species ◽  
Chromosome Morphology ◽  
North American Species ◽  
The North

Karyotypes of three eastern North American taxa of Actaea were investigated. Their karyotypes are as follows:[Formula: see text][Formula: see text][Formula: see text]Actaea rubra and its albino f. neglecta have identical karyotypes. The karyotypes of A. rubra f. rubra and A. pachypoda, two very distinct species, though similar, are clearly differentiated by the presence of a secondary constriction at the distal end of the long arm in the shorter of the two pairs of J-shaped chromosomes of A. pachypoda. The karyology of the three North American taxa is somewhat different from that reported by Kurita for A. asiatica.

1588: The Bicalutamide Early Prostate Cancer Program: Findings of the North American Trial at 7.7 Years' Median Follow-Up

2006 ◽  
Vol 175 (4S) ◽  
pp. 511-512
Author(s):  
David G. McLeod ◽  
Ira Klimberg ◽  
Donald Gleason ◽  
Gerald Chodak ◽  
Thomas Morris ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
North American ◽  
Early Prostate Cancer ◽  
The North ◽  
Cancer Program

Endoscopic Skull Base Surgery Practice Patterns: Survey of the North American Skull Base Society

2013 ◽  
Vol 74 (S 01) ◽  
Author(s):  
Pete Batra ◽  
Jivianne Lee ◽  
Samuel Barnett ◽  
Brent Senior ◽  
Michael Setzen ◽  
...  
Keyword(s):  
Skull Base ◽  
North American ◽  
Practice Patterns ◽  
Skull Base Surgery ◽  
Endoscopic Skull Base Surgery ◽  
The North

Transactions in science in comparative perspective

2018 ◽  
pp. 52-69
Author(s):  
A. N. Oleinik
Keyword(s):  
Transaction Costs ◽  
Academic Freedom ◽  
North American ◽  
Institutional Environment ◽  
Scientific Productivity ◽  
Institutional Environments ◽  
Academic Administrator ◽  
The North ◽  
American Case ◽  
Transactional Approach

The article develops a transactional approach to studying science. Two concepts play a particularly important role: the institutional environment of science and scientific transaction. As an example, the North-American and Russian institutional environments of science are compared. It is shown that structures of scientific transactions (between peers, between the scholar and the academic administrator, between the professor and the student), transaction costs and the scope of academic freedom differ in these two cases. Transaction costs are non-zero in both cases, however. At the same time, it is hypothesized that a greater scope of academic freedom in the North American case may be a factor contributing to a higher scientific productivity.

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