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.
He invented photography, by noticing, exploiting, and refining chemical reactions caused by light to produce permanent images. He began his work in 1813, and made the first negative photographic image in 1816, though the image was not permanent and faded quickly.