abstract in order to assess the availability of phosphorous (p), different methods have been proposed in the last decades. the results of these methods in soils with various ph, calcium carbonate, organic matter, al and fe oxides and hydroxides and other properties especially in iranian soils can not be used. in addition, knowledge about transformation of p forms is necessary for perception of ...

OBJECTIVE Although AF-induced atrial contractile dysfunction has significant clinical implications the underlying intracellular mechanisms are poorly understood. METHODS From the right atrial appendages of 59 consecutive patients undergoing mitral valve surgery (31 in SR, 28 in chronic AF) thin muscle preparations (diameter<0.7 mm) were isolated. Isometric force of contraction was measured in...

The discovery that structurally similar chemi cals may interfere with the utilization of certain essential metabolites has had far-reaching implica tions in the biological sciences. Several recent re views (9, 15) have discussed these types of com pounds and their postulated mechanisms of action. The search among metabolic analogs for chemotherapeutic agents in cancer is predicated upon the hyp...

effects of different soil moisture regimes and p application on available and inorganic p forms were studied in four paddy soils, north of iran. a factorial experiment in a completely randomized design with two replications was performed in a laboratory study. factors of soil at four levels (two acid and two alkaline-calcareous soils), soil moisture contents at three different levels (air-dry, ...

Superscalar processors exploit instruction-level parallelism (ILP) by dispatching machine instructions to several functional units where they are executed in parallel. The efficiency of parallelization at run-time can be increased through an additional scheduling phase for a concrete target machine in the compiler. But if the mobile code should be executed in a heterogenous network with process...

The free radicals formed by H-atom abstraction from many hydroxy-, monoand polycarboxylic acids have been characterized by a variety of fastkinetic techniques [1—4]. These studies led to some general conclusions, formulated by Hayon et al. [2], concerning the spectra and pK’s of the radicals. i) The absorption spectra of a-carboxyalkyl radicals have maxima in the spectral range of 320 to 350 nm...