Using a data set with an integrated luminosity of 2.93 fb−1 collected at s=3.773 GeV with the BESIII detector operating at the BEPCII storage rings, we search for the rare decay D+→D0e+νe. No ...signal events are observed. We set the upper limit on the branching fraction for D+→D0e+νe to be 1.0×10−4 at the 90% confidence level.
White lupin (Lupinus albus) forms specialized cluster roots characterized by exudation of organic anions under phosphorus (P) deficiency. Here, the role of nitric oxide (NO) in P deficiency-induced ...cluster-root formation and citrate exudation was evaluated. White lupin plants were treated with the NO donor sodium nitroprusside (SNP) and scavenger or inhibitor of NO synthase under conditions of P deficiency (0 μM) or P sufficiency (50 μM). Phosphorus deficiency enhanced NO production in primary and lateral root tips, with a greater increase in cluster roots than in noncluster roots. NO concentrations decreased with cluster root development from the pre-emergent stage, through the juvenile stage, to the mature stage. The P deficiency-induced increase in NO production was inhibited by antagonists of NO synthase and xanthine oxidoreductase, suggesting the involvement of these enzymes in NO production. SNP markedly increased the number of cluster roots. Citrate exudation from different root segments in P-deficient roots was positively correlated with endogenous root NO concentrations. These findings demonstrate differential patterns of NO production in white lupin, depending on root zone, developmental stage and P nutritional status. NO appears to play a regulatory role in the formation of cluster roots and citrate exudation in white lupin under conditions of P deficiency.
The control of male fertility is of vital importance for crop breeding, hybrid generation, and the control of pollen release. Recent development in the analysis of Arabidopsis male sterile mutants ...has meant that there is a greater understanding of the gene regulatory networks controlling maternal development of the anther and the resultant sporophytes. With the advent of the genome sequence and tools to allow the analysis of gene function, this knowledge base is now extending into the monocot crop rice. This has shown high levels of similarity between the networks of pollen development in Arabidopsis and rice, which will serve as valuable tools to understand and manipulate this developmental pathway further in plants.
The decay J/ψ→γγϕ is studied using a sample of 1.31×109 J/ψ events collected with the BESIII detector. Two structures around 1475 MeV/c2 and 1835 MeV/c2 are observed in the γϕ invariant mass ...spectrum for the first time. With a fit on the γϕ invariant mass, which takes into account the interference between the two structures, and a simple analysis of the angular distribution, the structure around 1475 MeV/c2 is found to favor an assignment as the η(1475) and the mass and width for the structure around 1835 MeV/c2 are consistent with the X(1835). The statistical significances of the two structures are 13.5σ and 6.3σ, respectively. The results indicate that both η(1475) and X(1835) contain a sizeable ss¯ component.
Precision measurement of the mass of the τ lepton Ablikim, M.; Achasov, M. N.; Albrecht, M. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
07/2014, Letnik:
90, Številka:
1
Journal Article
Recenzirano
An energy scan near the tau pair production threshold has been performed using the BESIII detector. About 24 pb(-1) of data, distributed over four scan points, were collected. This analysis is based ...on t pair decays to ee, e mu, eh, h, hh, e.,. and p. final states, where h denotes a charged p or K. The mass of the t lepton is measured from a maximum likelihood fit to the t pair production cross- section data to be m(tau) = 1776.91 +/- 0.12_0.10 - 0.13 _ MeV/c(2), which is currently the most precise value in a single measurement.
Nanotechnology is the understanding and control of matter generally in the 1–100 nm dimension range. The application of nanotechnology to medicine, known as nanomedicine, concerns the use of ...precisely engineered materials at this length scale to develop novel therapeutic and diagnostic modalities.1,2 Nanomaterials have unique physicochemical properties, such as ultra small size, large surface area to mass ratio, and high reactivity, which are different from bulk materials of the same composition. These properties can be used to overcome some of the limitations found in traditional therapeutic and diagnostic agents.
Clinical Pharmacology & Therapeutics (2008); 83, 5, 761–769. doi:10.1038/sj.clpt.6100400
We present an amplitude analysis of the decay D0→K−π+π+π− based on a data sample of 2.93 fb−1 acquired by the BESIII detector at the ψ(3770) resonance. With a nearly background free sample of about ...16000 events, we investigate the substructure of the decay and determine the relative fractions and the phases among the different intermediate processes. Our amplitude model includes the two-body decays D0→K¯*0ρ0, D0→K−a1+(1260) and D0→K1−(1270)π+, the three-body decays D0→K¯*0π+π− and D0→K−π+ρ0, as well as the four-body nonresonant decay D0→K−π+π+π−. The dominant intermediate process is D0→K−a1+(1260), accounting for a fit fraction of 54.6%.
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