n. A diploid cell from which an egg or ovum develops by meiosis. A primary oocyte divides to produce a polar body and a secondary oocyte, which divides again to produce the ovum and another polar body.(ËÉÊÉËsaÉªt). diploid cell from which an egg or ovum develops by meiosis. A primary oocyte divides to produce a polar body and a secondary oocyte, which divides again to produce the ovum and another polar body. (ËÉÊÉËsaÉªt).
NicÃ©phore NiÃ©pce. NicÃ©phore NiÃ©pce (born Joseph NiÃ©pce; 7 March 1765 â 5 July 1833) was a French inventor, now usually credited as the inventor of photography and a pioneer in that field. NiÃ©pce developed heliography, a technique he used to create the world's oldest surviving product of a photographic process: a print made from a photoengraved printing plate in 1825.
In 1839, John Herschel made the first glass negative, but his process was difficult to reproduce. Slovene Janez Puhar invented a process for making photographs on glass in 1841; it was recognized on June 17, 1852 in Paris by the Academie AcadÃ©mie Nationale, Agricole manufacturiere ManufacturiÃ¨re. et commerciale new era in color photography began with the introduction of Kodachrome film, available for 16 mm home movies in 1935 and 35 mm slides in 1936.