Series of broad resonances in atomic three-body systems

We re-examine the series of resonances found earlier in atomic three-body systems by solving the Faddeev-Merkuriev integral equations. These resonances are rather broad and line-up at each threshold with gradually increasing gaps, the same way for all thresholds and irrespective of the spatial symmetry. We relate these resonances to the Gailitis mechanism, which is a consequence of the polarization potential.Comment: 14 pages, 7 figures. arXiv admin note: text overlap with arXiv:0810.303

Jets and produced particles in pp collisions from SPS to RHIC energies for nuclear applications

Higher-order pQCD corrections play an important role in the reproduction of data at high transverse momenta in the energy range 20 GeV $\leq \sqrt{s} \leq 200$ GeV. Recent calculations of photon and pion production in $pp$ collisions yield detailed information on the next-to-leading order contributions. However, the application of these results in proton-nucleus and nucleus-nucleus collisions is not straightforward. The study of nuclear effects requires a simplified understanding of the output of these computations. Here we summarize our analysis of recent calculations, aimed at handling the NLO results by introducing process and energy-dependent $K$ factors.Comment: 4 pages with 5 eps figures include

Systems biology of energetic and atomic costs in the yeast transcriptome, proteome, and metabolome

Proteins vary in their cost to the cell and natural selection may favour the use of proteins that are cheaper to produce. We develop a novel approach to estimate the amino acid biosynthetic cost based on genome-scale metabolic models, and directly investigate the effects of biosynthetic cost on transcriptomic, proteomic and metabolomic data in _Saccharomyces cerevisiae_. We find that our systems approach to formulating biosynthetic cost produces a novel measure that explains similar levels of variation in gene expression compared with previously reported cost measures. Regardless of the measure used, the cost of amino acid synthesis is weakly associated with transcript and protein levels, independent of codon usage bias. In contrast, energetic costs explain a large proportion of variation in levels of free amino acids. In the economy of the yeast cell, there appears to be no single currency to compute the cost of amino acid synthesis, and thus a systems approach is necessary to uncover the full effects of amino acid biosynthetic cost in complex biological systems that vary with cellular and environmental conditions

Erdőszegélyek fajösszetételét és szerkezetét meghatározó tényezők

Vizsgálatainkat két eltérő termőhelyi viszonyok között kialakult e rdőtársulás esetében az erdőállomány és a szomszédos nyílt terület átmeneti zónájában végeztük. A Budai-hegységben két cseres- kocsánytalan tölgyes ( Quercetum petraeae-cerris S oó 1963) erdőállomány, illetve a szomszédos parlag - területek határán található, különböző égtáji kitettségű (ÉK, ÉNY, DK, DNY) erdőszegélyeket vizsgáltunk. Csáfordjánosfa határában egy síkvidéki üde tölgy-kőris-szil ligeterdő ( Fraxino pannonicae-Ulmetum S oó in A S zód 1935 corr. 1963), illetve a szomszédos dunántúli mocsárrét ( Deschampsietum caespitosae ) határán ki - alakult, az előbbiekkel megegyező égtáji kitettségű erdőszegélyeket vizsgáltuk. Célunk volt annak megállapítása, hogy van-e határozott különbség az átmeneti zóna egyes szerkezeti ele - meinek (nyílt terület, lágyszárú szegély, cserjés szegély, erdőköpeny, erdőbelső) fajösszetétele között, az egyes erdőtársulások, illetve a különböző égtáji kitettségű szegélyek esetében. Eredményeink alapján a cseres-kocsánytalan tölgyes és a tölgy-kőris-szil ligeterdő állományok szegélyei - nek fajösszetétele teljes mértékben eltér egymástól. Az erdőszegélyek fajösszetétele és szerkezete minden eset - ben az égtáji kitettségtől függően alakul

Cavity optomechanics using an optically levitated nanosphere

Recently, remarkable advances have been made in coupling a number of high-Q modes of nano-mechanical systems to high-finesse optical cavities, with the goal of reaching regimes where quantum behavior can be observed and leveraged toward new applications. To reach this regime, the coupling between these systems and their thermal environments must be minimized. Here we propose a novel approach to this problem, in which optically levitating a nano-mechanical system can greatly reduce its thermal contact, while simultaneously eliminating dissipation arising from clamping. Through the long coherence times allowed, this approach potentially opens the door to ground-state cooling and coherent manipulation of a single mesoscopic mechanical system or entanglement generation between spatially separate systems, even in room temperature environments. As an example, we show that these goals should be achievable when the mechanical mode consists of the center-of-mass motion of a levitated nanosphere.Comment: 33 pages, 6 figures, minor revisions, references adde