White blood cells are produced in the bone marrow. They are released into the bloodstream and travel wherever they are needed. Low levels of neutrophils occur when the bone marrow cannot replace them as fast as needed. In babies, the most common cause is infection. A very severe infection may cause neutrophils to be used up quickly. It may also prevent the bone marrow from producing more neutrophils. Sometimes, an infant who is not sick will have a low neutrophil count for no obvious reason.
Mikoyan-Gurevich MiG-17. The Mikoyan-Gurevich MiG-17 (Russian: Ð¼Ð¸ÐºÐ¾ÑÐ½ Ð¸ Ð³ÑÑÐµÐ²Ð¸Ñ Ð¼Ð¸Ð³-17) (NATO reporting name: Fresco) (China:Shenyang J-5) (Poland: PZL-Mielec Lim-6) is a high-subsonic fighter aircraft produced in the USSR from 1952 and operated by numerous air forces in many variants.
The Su-27SK multi-role fighter is an export variant of the Su-27 (NATO reporting name: Flanker) fighter developed by Sukhoi Design Bureau. The aircraft offers a maximum speed of Mach 2.35. Serial production of the Su-27SK commenced at Komsomolsk-on-Amur and Irkutsk production plants in 1991.