scholarly journals A Biblical Story for Two Stages: Abraham and Isaac in Fifteenth-Century Florence and York

2020 ◽  
Vol 24 ◽  
pp. 65-100
Author(s):  
Pietro Delcorno ◽  
Charlotte Steenbrugge
Keyword(s):  
Fifteenth Century ◽  
Biblical Story ◽  
Two Stages

Atlantic Seafaring

2012 ◽  
Author(s):  
N. A. M. Rodger
Keyword(s):  
Fifteenth Century ◽  
Atlantic World ◽  
South Atlantic ◽  
Atlantic History ◽  
The North ◽  
Celestial Navigation ◽  
Basic Facts ◽  
Two Stages ◽  
North And South ◽  
Current Systems

Without the ocean — or rather, the two oceans, the North and South Atlantic — we cannot account for many of the basic facts of Atlantic history. Only ships and seafaring made possible the construction of the Atlantic world. Two stages in the making of the Atlantic world need to be distinguished; the age of exploration, when the geography of the two oceans was yet to be determined, and the age of exploitation which followed. Besides knowledge of celestial navigation and the wind systems, there was one further key element of the Atlantic navigation system which was developed in the fifteenth century: the three-masted ship rig. Just as the wind and current systems favoured the Spaniards in the Caribbean, they favoured the Portuguese in the South Atlantic Ocean. The study of Atlantic navigation raises as many questions as it answers. It seems to account for the early success of Portugal and Spain, but also seems to make almost impossible the rise to prominence in international trade of such remote and unfavoured ports as London and Amsterdam.

Altered Fine Structure of B Lymphocytes Correlated with Defective Terminal Differentiation

1973 ◽  
Vol 31 ◽  
pp. 386-387
Author(s):  
Dale E. Bockman ◽  
L. Y. Frank Wu ◽  
Alexander R. Lawton ◽  
Max D. Cooper
Keyword(s):  
Immune Deficiency ◽  
B Lymphocytes ◽  
Plasma Cells ◽  
Present Report ◽  
Specific Antigen ◽  
Terminal Differentiation ◽  
Second Stage ◽  
Two Stages ◽  
Deficiency Diseases ◽  
Cell Line Generation

B-lymphocytes normally synthesize small amounts of immunoglobulin, some of which is incorporated into the cell membrane where it serves as receptor of antigen. These cells, on contact with specific antigen, proliferate and differentiate to plasma cells which synthesize and secrete large quantities of immunoglobulin. The two stages of differentiation of this cell line (generation of B-lymphocytes and antigen-driven maturation to plasma cells) are clearly separable during ontogeny and in some immune deficiency diseases. The present report describes morphologic aberrations of B-lymphocytes in two diseases in which second stage differentiation is defective.

Formation of Dislocation Channels in Neutron Irradiated Molybdenum

1972 ◽  
Vol 30 ◽  
pp. 672-673
Author(s):  
S. Mahajan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Channel Formation ◽  
Early Stages ◽  
Transmission Electron ◽  
Three Stages ◽  
Two Stages ◽  
Polycrystalline Molybdenum

The evolution of dislocation channels in irradiated metals during deformation can be envisaged to occur in three stages: (i) formation of embryonic cluster free regions, (ii) growth of these regions into microscopically observable channels and (iii) termination of their growth due to the accumulation of dislocation damage. The first two stages are particularly intriguing, and we have attempted to follow the early stages of channel formation in polycrystalline molybdenum, irradiated to 5×1019 n. cm−2 (E > 1 Mev) at the reactor ambient temperature (∼ 60°C), using transmission electron microscopy. The irradiated samples were strained, at room temperature, up to the macroscopic yield point.Figure 1 illustrates the early stages of channel formation. The observations suggest that the cluster free regions, such as A, B and C, form in isolated packets, which could subsequently link-up to evolve a channel.

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