منابع مشابه
Leonardo and the Camera Obscura
If Leonardo's studies of the camera obscura stand in a well established tradition, they remain important for at least three reasons. One is their sheer quantity: there are no less than 270 diagrams of camera obscuras in Leonardo's notebooks. Second, he uses it to demonstrate a wide range of optical principles: inversion of images, non-interference, images all in all, intensity of light and shad...
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This is a report of a studio experiment to explore how images from the camera obscura could have been used directly by artists of Vermeer’s era. It has a pragmatic and practical approach, bringing a painter’s eye and experience to the problems of transferring images from the lens to a canvas, using the primitive technology and unrefined materials available then. It addresses how an artist could...
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In this paper, the evolutionary and revolutionary developments of microscopic imaging are overviewed with a perspective on origins. From Alhazen's camera obscura, to Hooke and van Leeuwenhoek's two-dimensional optical micrography, and on to three- and four-dimensional (4D) electron microscopy, these developments over a millennium have transformed humans' scope of visualization. The changes in t...
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In order to procure new material for the study of problems connected with the non-disjunction of the sex chromosomes in Drosophila pseudoobscura, a series of X-ray experiments was carried out. Among the species of Drosophila,pseudo-obscura is distinguished by the length of itsxchromosome, whose genetic map is the longest recorded in any species (LANCEFIELD 1922). The work of LANCEFIELD has made...
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The chromosome complement The Diptera have not proved to be the most favorable material for the study of chromosome behavior, but the extensive work of STEVENS, METZ, KEUNEKE, and others has shown two exceptional properties in most sections of the order, namely, the pronounced somatic pairing of homologous chromosomes at mitosis, and the apparent lack in the male of the characteristic stages of...
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ژورنال
عنوان ژورنال: Nature Physics
سال: 2013
ISSN: 1745-2473,1745-2481
DOI: 10.1038/nphys2659