Coatlicue, c. 1500, Mexica (Aztec), found on the SE edge of the …
Coatlicue, c. 1500, Mexica (Aztec), found on the SE edge of the Plaza mayor/Zocalo in Mexico City, basalt, 257 cm high (National Museum of Anthropology, Mexico City) A conversation with Dr. Lauren Kilroy-Ewbank and Dr. Steven Zucker. Created by Beth Harris and Steven Zucker.
Codex Amiatinus, before 716, Wearmouth-Jarrow, c. 505 x 340 mm (Biblioteca Medicea …
Codex Amiatinus, before 716, Wearmouth-Jarrow, c. 505 x 340 mm (Biblioteca Medicea Laurenziana, Florence, MS Amiatino 1) Speakers: Dr. Claire Breay, Head of Ancient, Medieval and Early Modern Manuscripts and Dr. Beth Harris. Created by Beth Harris and Steven Zucker.
In complete dominance, only one allele in the genotype is seen in …
In complete dominance, only one allele in the genotype is seen in the phenotype. In codominance, both alleles in the genotype are seen in the phenotype. In incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype.
How symbolic language drives collective learning and how this is one of …
How symbolic language drives collective learning and how this is one of the truly differentiating aspects of human beings relative to the rest of the animal kingdom. Created by Sal Khan.
How symbolic language drives collective learning and how this is one of …
How symbolic language drives collective learning and how this is one of the truly differentiating aspects of human beings relative to the rest of the animal kingdom. Created by Sal Khan.
Introduced in 1851, by Frederick Scott Archer, the wet collodion process was …
Introduced in 1851, by Frederick Scott Archer, the wet collodion process was a fairly simple, if somewhat cumbersome photographic process. A 2% solution of collodion, bearing a very small percentage of potassium iodide, was poured over a plate of glass, leaving a thin, clear film containing the halide. The plate was then placed in a solution of silver nitrate. When removed from the silver, the collodion film contained a translucent yellow compound of light-sensitive silver iodide. The plate was exposed still wet and then developed by inspection under red light. Once the plate was washed and dried, it was coated with a protective varnish. The collodion process replaced the daguerreotype as the predominant photographic process by the end of the 1850’s. It was eventually replaced in the 1880’s with the introduction of the gelatin silver process. This project is made possible by a grant from the U.S. Institute of Museum and Library Services, grant number MA-10-13-0194.
Photography’s earliest practitioners dreamed of finding a method for reproducing the world …
Photography’s earliest practitioners dreamed of finding a method for reproducing the world around them in color. Some 19th century photographers experimented with chemical formulations aimed at producing color images by direct exposure, while others applied paints and powders to the surfaces of monochrome prints. Vigorous experimentation led to several early color processes, some of which were even patented, but the methods were often impractical, cumbersome and unreliable. This chapter explores early additive color processes as well as later subtractive processes like chromogenic color and the Kodachrome. This project is made possible by a grant from the U.S. Institute of Museum and Library Services, grant number MA-10-13-0194.
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