By sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunodiffusion, we identified paramyosin in two smooth invertebrate "catch" muscles (Mytilus anterior byssus retractor and Mercenaria opaque adductor) and five invertebrate striated muscles (Limulus telson levator, Homarus claw muscle, Balanus scutal depressor, Lethocerus air tube retractor, and Aequipecten striated adductor). We...

Contractions induced by adenosine triphosphate, in myofibrils isolated from the barnacle, Balanus aquilia, were observed with a phase microscope. The formation of contraction bands was well under way before the A-band came into contact with the Z-membrane. This is in disagreement with the hypothesis that contraction bands are formed when the A-band pushes against the Z-membrane.

Temperature and salinity shape the distribution and genetic structure of marine communities. Future warming and freshening will exert an additional stress to coastal marine systems. The extent to which organisms respond to these shifts will, however, be mediated by the tolerances of all life-stages and populations of species and their potential to adapt. We investigated nauplius and cypris larv...

We have numerically investigated a three-body problem consisting of the Sun, an asteroid, and an infinitesimal particle initially placed about the asteroid. We assume that the asteroid has the following properties: a circular heliocentric orbit at R -2.55 AU, an asteroid/Sun mass ratio of/~ -5 x 10-12, and a spherical shape with radius R A -100 km; these values are close to those of the minor p...

Six new compounds, omaezol, intricatriol, hachijojimallenes A and B, debromoaplysinal, and 11,12-dihydro-3-hydroxyretinol have been isolated from four collections of Laurencia sp. These structures were determined by MS and NMR analyses. Their antifouling activities were evaluated together with eight previously known compounds isolated from the same samples. In particular, omaezol and hachijojim...

the main interested food for rutilus frisii kutums in the eastern and western coasts of anzali port is cardium. on the basis of the occurrence method the food items such as crab and balanus also performs an important role in feeding behaviours of fishes in this region. feeding intensity during the period of study (from october 1994 up to march 1995) significantly differs from month to month (p