Harzburgitic xenoliths cut by pyroxenite veins from Avachinsky volcano, Kamchatka, are derived from the sub-arc mantle and record element transfer from the slab to the arc. Olivine and orthopyroxene in the harzburgites have Li isotopic compositions (dLi = ?2.8 to ?5.6) comparable to estimates of the upper mantle (dLi * ?4 ± 2). The pyroxenite veins, which represent modal metasomatism and may th...

Addition of MgADP to skinned skeletal muscle fibers causes a rise in Ca(2+)-activated isometric tension. Mechanisms underlying this tension increase have been investigated by rapid photogeneration of ADP within skinned single fibers of rabbit psoas muscle. Photolysis of caged ADP (P2-1(2-nitrophenyl)ethyladenosine 5'-diphosphate) resulted in an exponential increase in isometric tension with an ...

Tension spline is a function that, for given partition x0 < x1 < . . . < xn, on each interval [xi, xi+1] satisfies differential equation (D − ρiD)u = 0, where ρi’s are prescribed nonnegative real numbers. In the literature, tension splines are used in collocation methods applied to two-points singularly perturbed boundary value problems with Dirichlet boundary conditions. In this paper, we adap...

Under ischemic conditions, contractile responses of canine coronary artery smooth muscle are decreased, pH is decreased, and lactate levels are increased. To investigate whether lactate has a pH-independent relaxant action on contractility, inhibitory effects of 1.0 mM lactate on Ca fluxes and increased tension elicited with either 60 mM KCl or 10 ftyi prostaglandin F2o (PGF2o) were measured at...

Under ischemic conditions, contractile responses of canine coronary artery smooth muscle are decreased, pH is decreased, and lactate levels are increased. To investigate whether lactate has a pH-independent relaxant action on contractility, inhibitory effects of 1.0 mM lactate on Ca fluxes and increased tension elicited with either 60 mM KCl or 10 ftyi prostaglandin F2o (PGF2o) were measured at...

Tension stiffening is an essential effect that influences the behaviour of concrete structures under serviceability conditions, mainly regarding crack control and deflection behaviour. Serviceability conditions can be studied experimentally by running so-called uniaxial tensile test. This paper reports extensive experimental research conducted to study reinforced Ultra-High Performance Fibre-Re...

The isometric tension development of a one-dimensional regionally ischemic muscle was analyzed theoretically. The model consist of a one-dimensional normal segment in series with a one-dimensional ischemic segment. Each segment is modeled as a three-element muscle. The inputs to the various elements, except the contractile element in ischemic segment, were obtained from published data for cat p...