Bacteriophage lambda packages the DNA of the related phage 21 poorly [Hohn, B. (1975) J. Mol. Biol. 98, 93--106]. To understand the nature of the packaging defect, the interaction of the cohesive end site (cos) specific for phage 21 (cos phi 21) with phage lambda terminase has been investigated. The ability of lambda terminase to cleave cos phi 21 was studied in vitro; lambda terminase cleaved ...

INTRODUCTION Photosynthetic symbioses in Cnidaria are major contributors to the structural and trophic foundation of shallow water coral reef ecosystems at tropical and subtropical latitudes. Reef-building corals form a symbiosis with photosynthetic dinoflagellates belonging to the genus Symbiodinium, which reside intracellularly in host endodermal cells (Muscatine, 1990; Trench, 1993). This en...

Introduction Autocrine motility factor (AMF) was originally identified by its ability to stimulate directional motility (chemotaxis) and random motility (chemokinetics) of the AMF-producing tumor cells. AMF stimulates cell motility and growth via a receptor-mediated signaling pathway involving morphological changes, receptor phosphorylation, a pertussis toxin-sensitive G-protein activation, ino...

We prove a discrete Jordan-Brouwer-Schoenflies separation theorem telling that a (d − 1)-sphere H embedded in a d-sphere G defines two different connected graphs A,B in G such a way that A ∩B = H and A ∪B = G and such that the complementary graphs A,B are both d-balls. The graph theoretic definitions are due to Evako: the unit sphere of a vertex x of a graph G = (V,E) is the graph generated by ...

The human monocyte (M phi subset rosetting with anti RH-coated human erythrocytes via high-affinity, 72 kD receptors (FcRI+), contains the PGE2-producing immunosuppressive subpopulation, while the non-rosetting M phi subset (FcRI-) is the major plasminogen activator-producing and antigen-presenting M phi. This study gives additional evidence for the functional disparity of the FcRI- and FcRI+ M...

the present study was conducted to computer social skills of male students with partially hearing impairment (phi ) in integrated versus nonintegrated school settings in tehran, iran. in this ex post facto research, 60 phi students participated(30 students in integrated schools and 30 in nonintegrated schools). in this study two different kinds of educational settings were considered as an inde...

The current study investigates the dissipation kinetics of two imidacloprid (IMI) nanoformulations (entitled: Nano-IMI and Nano-IMI/TiO2) on common bean (Phaseolus vulgaris) seeds under field conditions and compares them with 35% Suspension Concentrate (SC) commercial formulation. To do so, it sprays P. vulgaris plants at 30 and 60 g/ha within green bean stage, sampling them during the 14-day p...

In 1967, Grünbaum conjectured that any d-dimensional polytope with d + s ? 2d vertices has at least $${\phi _k}(d s,d) = \left( {\matrix{{d 1} \cr {k } \right) {\matrix{d - {\matrix{ {d 1 s} \right)$$ k-faces. We prove this conjecture and also characterize the cases in which equality holds.