Many regions of the open, oligotrophic oceans are depleted of nutrients, especially nitrogen and iron. The biogenesis and the functioning of the photosynthetic apparatus may be specialized and tailored to the various marine habitats. In this minireview, we discuss some new findings with respect to photosynthetic processes in the oceans. We focus on findings that suggest that some cyanobacteria ...

Constructing atomically dispersed platinum (Pt) electrocatalysts is essential to build high-performance and cost-effective electrochemical water-splitting systems. We present a novel strategy to realize the traction and stabilization of isolated Pt atoms in the nitrogen-containing porous carbon matrix (Pt@PCM). In comparison with the commercial Pt/C catalyst (20 weight %), the as-prepared Pt@PC...

demonstrate that molecular hydrogen but not molecular nitrogen inhibits the splitting of H2 from pyruvate by Clostridium pasteurianum. The effect of H2 is similar to that observed by Kubowitz (Biochem. Z., 274, 285, 1934) with Clostridium butyricum and probably merely reflects a shift in the equilibrium of the reaction. The findings were not affected by substituting argon for the helium. From t...

In this paper we restrict every set splitting problem to the special case in which every set has just three elements. This restricted version is also NP-complete. Then, we introduce a general conversion from any set splitting problem to 3-set splitting. Then we introduce a randomize algorithm, and we use Markov chain model for run time complexity analysis of this algorithm. In the last section ...

Practical application of hydrogen production from water splitting relies strongly on the development of low-cost and high-performance electrocatalysts for hydrogen evolution reaction (HER). The previous researches mainly focused on transition metal nitrides as HER catalysts due to their electrical conductivity and corrosion stability under acidic electrolyte, while tungsten nitrides have report...

Structural and magnetic properties of the GdFe12_~MOx compounds having the ThMn12 type of structure were studied. Rare-earth nitrides of the composition GdFe 12-x MOx N y were prepared by the reaction of GdFe12_x MOx with nitrogen gas at 475°C. The crystal structure and lattice constants have been determined for all compounds. The lattice expansion of the nitrogenated compounds is mainly along ...

In this paper the band structures of GaxIn1-xNyAs1-y/GaAs strained quantum wells are investigated using 4x4 k.p Hamiltonian including the heavy hole, light hole and spin-orbit splitting bands. The III–V-nitride semiconductor alloys, GaxIn1-xNyAs1-y, operating at optical fibre telecommunications wavelengths around 1.3 μm, attract an increasing amount of attention in the last couple of years not ...

the aim of this study is investigation on effect of stem end splitting and geranium essential oil on vase life on quality of cut chrysanthemum (dendranthema grandiflorum l.). this experiment arranged as factorial based on rcd with 2 factors of stem end splitting at 2 levels (with splitting and without splitting) and geranium essential oil at 6 levels (0, 1, 2, 4, 8 and 10 %), with 12 treatments...