Time-resolved broadband analysis of slow-light propagation and superluminal transmission of electromagnetic waves in three-dimensional photonic crystals

A time-resolved analysis of the amplitude and phase of THz pulses propagating through three-dimensional photonic crystals is presented. Single-cycle pulses of THz radiation allow measurements over a wide frequency range, spanning more than an octave below, at and above the bandgap of strongly dispersive photonic crystals. Transmission data provide evidence for slow group velocities at the photonic band edges and for superluminal transmission at frequencies in the gap. Our experimental results are in good agreement with finite-difference-time-domain simulations

Time-resolved broadband analysis of slow-light propagation and superluminal transmission of electromagnetic waves in three-dimensional photonic crystals

A time-resolved analysis of the amplitude and phase of THz pulses propagating through three-dimensional photonic crystals is presented. Single-cycle pulses of THz radiation allow measurements over a wide frequency range, spanning more than an octave below, at and above the bandgap of strongly dispersive photonic crystals. Transmission data provide evidence for slow group velocities at the photonic band edges and for superluminal transmission at frequencies in the gap. Our experimental results are in good agreement with finite-difference-time-domain simulations.Comment: 7 pages, 11 figure

Morfologija i sekvence mitohondrijske DNK pokazuju da su Plecotus alpinus Kiefer & Veith, 2002 i Plecotus microdontus Spitzenberger, 2002 sinonimi Plecotus macrobullaris Kuzjakin, 1965

Genetic and morphological analyses of long-eared bats from Northern Ossetia and other Caucasian localities revealed that the sister clade of Plecotus auritus discovered in the Eastern Alps (SPITZENBERGER et al., 2001) and described as a new species by Spitzenberger (SPITZENBERGER et al., 2002) (Plecotus microdontus) and by KIEFER & VEITH (2002) (Plecotus alpinus) is conspecific with Plecotus macrobullaris Kuzyakin, 1965, described as a subspecies of P. auritus, from the vicinity of Vladikavkaz. The valid name for this species therefore is Plecotus macrobullaris. P. macrobullaris also occurs in central and eastern Turkey. Morphological as well as genetic analyses differentiate between an eastern and a western group within P. macrobullaris. From a morphological comparison of specimens of P. macrobullaris with the type specimens of Plecotus wardi from Kashmir we conclude that macrobullaris is not conspecific with wardi.Genetske i morfološke analize dugouhih šišmiša iz Sjeverne Osetije i drugih kavkaskih lokaliteta otkrile su da je sestrinska grupa vrste Plecotus auritus, otkrivena u Istočnim Alpama (SPITZENBERGER et al., 2001) i opisana kao nova vrsta od Spitzenberger (SPITZENBERGER et al., 2002) (Plecotus microdontus) i KIEFER & VEITH (2002) (Plecotus alpinus), konspecifična s vrstom Plecotus macrobullaris Kuzyakin, 1965, opisanom kao podvrsta od P. auritus iz blizine Vladikavkaza. Zato je validno ime ove vrste Plecotus macrobullaris. P. macrobullaris se također javlja u središnjoj i istočnoj Turskoj. Morfološke i genetičke analize pokazuju razliku istočne i zapadne grupe unutar P. macrobullaris. Iz morfološke usporedbe primjeraka P. macrobullaris s tipskim primjercima Plecotus wardi iz Kašmira zaključujemo da macrobullaris nije konspecifičan s wardi

First Observation of 15Be

The neutron-unbound nucleus 15Be was observed for the first time. It was populated using neutron transfer from a deuterated polyethylene target with a 59 MeV/u 14Be beam. Neutrons were measured in coincidence with outgoing 14Be particles and the reconstructed decay energy spectrum exhibits a resonance at 1.8(1) MeV. This corresponds to 15Be being unbound by 0.45 MeV more then 16Be thus significantly hindering the sequential two-neutron decay of 16Be to 14Be through this state

ODORANT1 targets multiple metabolic networks in petunia flowers

Scent bouquets produced by the flowers of Petunia spp. (petunia) are composed of a complex mixture of floral volatile benzenoid and phenylpropanoid compounds (FVBPs), which are specialized metabolites derived from phenylalanine (Phe) through an interconnected network of enzymes. The biosynthesis and emission of high levels of these volatiles requires coordinated transcriptional activation of both primary and specialized metabolic networks. The petunia R2R3‐MYB transcription factor ODORANT 1 (ODO1) was identified as a master regulator of FVBP production and emission; however, our knowledge of the direct regulatory targets of ODO1 has remained limited. Using chromatin immunoprecipitation followed by sequencing (ChIP‐seq) in petunia flowers, we identify genome‐wide ODO1‐bound genes that are enriched not only in genes involved in the biosynthesis of the Phe precursor, as previously reported, but also genes associated with the specialized metabolic pathways involved in generating phenylpropanoid intermediates for FVBPs. ODO1‐bound genes are also involved in methionine and S‐adenosylmethionine metabolism, which could modulate methyl group supplies for certain FVBPs. Quantitative reverse transcription polymerase chain reaction (qRT‐PCR) and RNA‐seq analysis in an ODO1 RNAi knockdown line revealed that ODO1‐bound targets are expressed at lower levels when ODO1 is suppressed. A cis‐regulatory motif, CACCAACCCC, was identified as a potential binding site for ODO1 in the promoters of genes that are both bound and activated by ODO1, which was validated by in planta promoter reporter assays with wild‐type and mutated promoters. Overall, our work presents a mechanistic model for ODO1 controlling an extensive gene regulatory network that contributes to FVBP production to give rise to floral scent

Further Insights into the Reaction Be14(CH2,X)10He

A previously published measurement of the reaction of a 59 MeV/nucleon 14Be beam on a deuterated polyethylene target was further analyzed to search for 12He as well as initial state effects in the population of the 10He ground state. No evidence for either was found. A lower limit of about 1 MeV was determined for a possible resonance in 12He. In addition, the three-body decay energy spectrum of 10He could not be described by a reaction mechanism calculation based on the halo structure of the initial 14Be assuming a direct α-particle removal reaction

Scoping review of clinical practice guidelines on the management of benign liver tumours

OBJECTIVE: Benign liver tumours (BLT) are increasingly diagnosed as incidentalomas. Clinical implications and management vary across and within the different types of BLT. High-quality clinical practice guidelines are needed, because of the many nuances in tumour types, diagnostic modalities, and conservative and invasive management strategies. Yet, available observational evidence is subject to interpretation which may lead to practice variation. Therefore, we aimed to systematically search for available clinical practice guidelines on BLT, to critically appraise them, and to compare management recommendations. DESIGN: A scoping review was performed within MEDLINE, EMBASE, and Web of Science. All BLT guidelines published in peer-reviewed, and English language journals were eligible for inclusion. Clinical practice guidelines on BLT were analysed, compared, and critically appraised using the Appraisal of Guidelines, Research and Evaluation (AGREE II) checklist regarding hepatic haemangioma, focal nodular hyperplasia (FNH), and hepatocellular adenoma (HCA). Preferred Reporting Items for Systematic Reviews and Meta-Analyses recommendations (PRISMA) for scoping reviews were adhered to. RESULTS: The literature search yielded unique 367 papers, 348 were excluded after screening of title/abstract, and 16 after full-text screening. Three guidelines were included: the American College of Gastroenterology (ACG; 2014), Brazilian Society of Hepatology (SBH; 2015), and European Association for the Study of the Liver (EASL; 2016). There was no uniformity in the assessment methods for grading and gravity of recommendations between guidelines. Among observed differences were: (1) indications for biopsy in all three tumours; (2) advices on contraceptive pills and follow-up in FNH and HCA; (3) use of an individualised approach to HCA; (4) absence of recommendations for treatment of HCA in men; and (5) approaches to HCA subtype identification on magnetic resonance imaging. CONCLUSION: Recognising differences in recommendations can assist in harmonisation of practice standards and identify unmet needs in research. This may ultimately contribute to improved global patient care