differentiated embryo
91Arthropod head problem — The arthropod head problem is a long standing zoological dispute concerning the segmental composition of the heads of the various arthropod groups, and how they are evolutionarily related to each other. While the dispute has historically centered …
92Development of the gonads — The prenatal development of the gonads is a part of the development of reproductive system and ultimately forms the testes in males and ovaries in females. They initially develop from the mesothelial layer of the peritoneum. The ovary is… …
93cetacean — cetaceous, adj. /si tay sheuhn/, adj. 1. belonging to the Cetacea, an order of aquatic, chiefly marine mammals, including the whales and dolphins. n. 2. a cetacean mammal. [1830 40; < NL Cetace(a) name of the order (see CET , ACEA) + AN] * * *… …
94France — /frans, frahns/; Fr. /frddahonns/, n. 1. Anatole /ann nann tawl /, (Jacques Anatole Thibault), 1844 1924, French novelist and essayist: Nobel prize 1921. 2. a republic in W Europe. 58,470,421; 212,736 sq. mi. (550,985 sq. km). Cap.: Paris. 3.… …
95hormone — hormonal, hormonic /hawr mon ik, moh nik/, adj. /hawr mohn/, n. 1. Biochem. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues… …
96hymenopteran — /huy meuh nop teuhr euhn/, adj. 1. hymenopterous. n. 2. Also, hymenopter. a hymenopterous insect. [1875 80; HYMENOPTER + AN] * * * ▪ insect Introduction any member of the third largest and perhaps the most beneficial to humans of all insect… …
97neural stem cell — ▪ biology largely undifferentiated cell originating in the central nervous system (nervous system, human). Neural stem cells (stem cell) (NSCs) have the potential to give rise to offspring cells that grow and differentiate into neurons… …
98Nobel Prize winners by name — ▪ Table Nobel Prize winners by name A B C D E F G H I J K L M N O P Q R S T U V W Y Z A name year category country* achievement literary area Abrikosov, Alexey A. 2003 physics U.S. discoveries… …
99Nobel Prize winners by year — ▪ Table Nobel Prize winners by year 1901–10 1941–50 1981–90 1911–20 1951–60 1991–2000 1921–30 1961–70 2001–08 1931–40 1971–80 1901–10 year category name country* achievement literary area 1901 chemistry Henricus van t (Hoff, Jacobus Henricus van… …
100pole — pole1 [pōl] n. [ME < OE pal < L palus, PALE2] 1. a long, slender piece of wood, metal, etc. usually rounded [a tent pole, flagpole, fishing pole] 2. a tapering wooden shaft extending from the front axle of a wagon or carriage and attached… …
