scholarly journals Probable Nature of the Internal Symmetry of Crystals

Nature ◽  
1883 ◽  
Vol 29 (738) ◽  
pp. 186-188 ◽  
Author(s):  
WILLIAM BARLOW
Keyword(s):  
Internal Symmetry ◽  
Probable Nature

scholarly journals “Probable Nature of the Internal Symmetry of Crystals”

Nature ◽  
1884 ◽  
Vol 29 (747) ◽  
pp. 383-384 ◽  
Author(s):  
L. SOHNCKE
Keyword(s):  
Internal Symmetry ◽  
Probable Nature

scholarly journals Probable Nature of the Internal Symmetry of Crystals 1

Nature ◽  
1883 ◽  
Vol 29 (739) ◽  
pp. 205-207 ◽  
Author(s):  
WILLIAM BARLOW
Keyword(s):  
Internal Symmetry ◽  
Probable Nature

scholarly journals “Probable Nature of the Internal Symmetry of Crystals”

Nature ◽  
1884 ◽  
Vol 29 (748) ◽  
pp. 404-404 ◽  
Author(s):  
WM. BARLOW
Keyword(s):  
Internal Symmetry ◽  
Probable Nature

scholarly journals THE PROBABLE NATURE OF THE INFECTIOUS AGENT OF TRACHOMA

1937 ◽  
Vol 65 (5) ◽  
pp. 735-755 ◽  
Author(s):  
L. A. Julianelle ◽  
R. W. Harrison ◽  
M. C. Morris
Keyword(s):  
Tissue Culture ◽  
Gentian Violet ◽  
Infectious Agent ◽  
Heat Inactivation ◽  
Time Interval ◽  
General Observation ◽  
Specific Reaction ◽  
Rare Occasion ◽  
Probable Nature ◽  
The Brain

1. The infectious agent of trachoma can be freed from extraneous bacteria by passage through rabbit testicle. 2. The infectious agent multiplies little, if at all, during such passage, but in many instances retains its infectivity undiminished. 3. No specific changes occur in the rabbit testicle incidentally to the passage. 4. On rare occasion the trachoma agent may be freed from bacteria by intracerebral passage. The brain tissues show no specific reaction. 5. Filtration experiments with Seitz, Kramer, Berkefeld, and Elford filters confirm the general observation that the infectious agent is filterable with difficulty. 6. Tissue culture experiments, with tissues containing the infectious agent (conjunctiva, rabbit testicle, brain, etc.), conducted under a wide variety of conditions, proved uniformly unsuccessful in the cultivation of the agent. 7. The agent is inactivated by bile, AgNO3, phenol, cocaine, tartar emetic, and gentian violet. Its heat inactivation temperature is between 45° and 50°C., at a time interval of 15 minutes. 8. Attempts to preserve the infectious agent in glycerine were unsuccessful. 9. The accumulated evidence suggests that the infectious agent of trachoma is a virus.

Memoirs: The Cytopasmic Inclusion of the Germ-Cells

1917 ◽  
Vol s2-62 (247) ◽  
pp. 407-463
Author(s):  
J. BRONTÉ GATENBY
Keyword(s):  
Germ Cell ◽  
Primordial Germ Cell ◽  
Growth Period ◽  
Pieris Brassicae ◽  
Constant Factor ◽  
Cytoplasmic Bodies ◽  
Female Germ Cell ◽  
Probable Nature ◽  
And Function ◽  
Definite Period

(1) In Smerinthus populi, Pieris brassicæ, and a number of other species of moths and butterflies the cytoplasmic bodies have been followed out. (2) The micromitosome lias been followed from the spermatocyte back into the secondary spermatogonium. It is very probably present in the primordial germ-cell. (3) The micromitosome has been definitely found in the female. (4) The micromitosome seems to divide in all divisions, and I consider that it is a constant factor in the spermatids of Smerinthus. (5) The probable nature and function of the micromitosome is discussed. (6) The mitochondria have been carefully examined in the male and female germ-cell in all stages except in the maturation division of the female and in fertilisation. (7) It has been shown that in early stages the cytoplasmic bodies of the female resemble those of the male. (8) There is a definite period, judged to be about the beginning of growth stage, when the subsequent fate of the mitochondria in the male becomes different from that of the female. (9) The remarkable formation of chromophobe and chromophile zones in the male mitochondrial body aud the use of these zones are described. (10) The formation of the macromitosome from the mitochondria is described. (11) The changes undergone by the macromitosome in sperm formation are followed out. (12) The presence of the acroblasts in the fairly early growth period of the spermatocyte is described. (13) The complicated evolutions of these bodies in division of the cells, their subsequent fate and' their probable nature are discussed. (14) The staining and fixing reactions of the cytoplasmic bodies are fully described. (15) A number of abnormalities have been described. (16) The centrosome has been shown to divide in the young spermatid, and one centrosome is probably lost, but definite evidence is not forthcoming.

On the Impact Behavior of a Material With a Yield Point

1949 ◽  
Vol 16 (1) ◽  
pp. 39-52
Author(s):  
Merit P. White
Keyword(s):  
Yield Stress ◽  
Yield Point ◽  
Impact Behavior ◽  
Longitudinal Impact ◽  
Stress Strain ◽  
California Institute Of Technology ◽  
Static Yield ◽  
Institute Of Technology ◽  
Probable Nature ◽  
The Impact

Abstract An analysis of longitudinal impact tests that were made by Drs. D. S. Clark and P. E. Duwez at the California Institute of Technology on an iron and a steel with definite yield points is described. From this analysis is deduced the probable nature of the dynamic stress-strain relations for such materials. These appear to differ greatly from the static stress-strain relations, unlike the case for materials without yield points. As pointed out by Duwez and Clark, the upper yield stress for undeformed material is several times as great under impact as the static yield stress. The present analysis indicates that under impact, the material with a definite yield point is made harder at a given deformation, and ruptures at a higher (engineering) stress and smaller strain than when loaded statically. The critical impact velocity, defined as that at which nearly instantaneous failure occurs in tension, is discussed, and the factors upon which it depends are given.

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