Cell migration during morphogenesis and organogenesis is under strict spatial and temporal control. Several lines of evidence suggest that migration is regulated by interactions of cells with the extracellular matrix (ECM) (see reviews by Thiery, 1985; Bronner-Fraser, 1990; Johnson et al., 1990). These interactions take place between cell surface receptors and their ECM ligands, among which fib...

In this paper, I provide arguments in favor of subtonal features, with data from Laal, an endangered, three-tone isolate language southern Chad. show that a system using the two features [upper] and [raised] (Yip 1980, Pulleyblank 1986) offers straightforward account properties Mid tone are otherwise impossible to for three tonal primitives H, M, L. Laal provides evidence parallels between segm...

3,925,344 A 12, 1975 MaZur 4,001,401 A 1/1977 Bonsen et al. 4,061,736 A 12/1977 Morris et al. 4473,496 A 9, 1984 Scannon 4,529,719 A 7/1985 Tye 4,584,130 A 4, 1986 Bocci et al. 4,600,531 A 7, 1986 Walder 4,826,811 A 5/1989 Sehgal et al. 4,857,636 A 8, 1989 Hsia 5,028,588 A 7, 1991 Hoffman et al. 5,194.590 A 3/1993 Sehgal et al. 5,234,903. A 8, 1993 Nho et al. 5,250,665 A 10/1993 Kluger et al. 5...

abd al-rah?m?n al-s??f? is a well-known astronomer who has some works in astronomy, mathematics and alchemy. the importance of his s?uwar al-kaw?kib (book about the constellations) caused that researchers don’t practice his other works. four treatises on astrolabe are ascribed to al-s??f?, any one of them is in persian. attribution of the three arabic treatises among these four to him is certai...

Abrupt arid events in the post-glacial (w17.4–10 kyr BP) Dead Sea Basin (DSB) were recorded by significant lake level declines in Lake Lisan and massive deposition of gypsum and salt. Between 17.4 and 16 kyr cal BP, the lake level dropped from its late MIS2 stand of w260 m below mean sea level (m bmsl) to w330 m bmsl, depositing a thick sequence of gypsum. Between w16 and 15 kyr cal BP the lake...

1 Drosos AA, Christou L, Galanopoulou V, Tzioufas AG, Tsiakou EK. D-Pencillamine induced myasthenia gravis: clinical, serological and genetic fincings. Clin Exp Rheumatol 1993; 11: 387-91. 2 Dubost JJ, Soubrier M, Bouchet F, et al. Neuromuscular complications of D-penicillamine in rheumatoid arthritis. Rev Neurol Paris 1992; 148: 207-11. 3 Epstein 0, Jain S, Lee RG, et al. D-Pencillamine treatm...

Introduction The purpose of many ecological studies is to identify interactions between faunistic ecosystem components by means of laboratory and field experiments. It has often been shown that abiotic and biotic factors such as competition, disturbance and predation influence the composition and dynamics of macrobenthos communities (REISE, 1977; COMMITO and AMBROSE, 1985; AMBROSE, 1986; BEUKEM...