193,112 research outputs found
INCLUSIVE J/OMEGA, OMEGA(2S), AND B-QUARK PRODUCTION IN (P)OVER-BAR-P COLLISIONS AT ROOT-S = 1.8 TEV
No full textInclusive J/psi and psi(2S) production has been studied in ppBAR collisions at square-root s = 1.8 TeV using 2.6+/-0.2 pb-1 of data taken with the Collider Detector at Fermilab. The products of production cross section times branching fraction were measured as functions of P(T) for J/psi --> mu+mu- and psi(2S) --> mu+mu-. In the kinematic range P(T)>6 GeV/c and Absolute value of eta less-than-or-equal-to 0.5 we get sigma(ppBAR --> J/psiX)B(J/psi --> mu+mu-) = 6.88+/-0.23(stat)-1.08(+0.93)(syst) nb, and sigma(ppBAR --> psi(2S)X)B(psi(2S) --> mu+mu-) = 0.232+/-0.251(stat)-0.032(+0.029)(syst) nb. From these values we calculate the inclusive b-quark production cross section
Less Favoured Area Measure in the Netherlands: a welcome or negligible addition?
No full textThe Less Favoured Areas (LFAs) Directive (75/268) which was introduced in 1975, was the first common European instrument of regional agricultural structural policy. LFAs are areas where agriculture is hampered by permanent natural handicaps. The major objectives were to ensure the continuation of farming, thereby maintaining a minimum population level and preserving scenic landscapes and environmentally valuable habitats. In the Netherlands, the LFA measure is used as an additional payment, to compensate farmers for negative economic effects due to the conservation of these natural handicaps. It was not implemented as a stand alone policy, but is linked to measures aiming at active nature and landscape conservation management. In this paper, the effects will be examined of the regulations aiming at the conservation of natural handicaps on farm businesses within LFAs, when comparing them to farm businesses outside LFAs, where these regulations and handicaps do not exist. The main data source that was used is the Farm Accountancy Data Network. Reference groups of farms were compiled with the use of the simple and multiple imputation approach in Stars (Statistics for Regional Studies). Both analyses were tested with the use of a parametric and a nonparametric test. When comparing the results of both analyses, it can be concluded that there is no evidence that there is a statistical difference in family farm income corrected for and not corrected for LFA payment between the LFA farm businesses and the reference groups. Based on these findings it can be concluded that the size of the compensatory allowances is small and there is no evidence that it has a significant effect on the family farm income of LFA farm businesses. The main purpose of the Dutch LFA policy is to compensate farm businesses for negative economic effects due to the conservation of natural handicaps. Although this may be true for some individual farms, based on the methods used in this paper, it appears not to be the case for the collectivity of LFA premium beneficiaries as a whole.Less Favoured Areas, family farm income, regional development, Agricultural and Food Policy,
Search for - oscillations in the decay
No full textWe report the first search for -- oscillations in the
decay by analyzing
events accumulated with the BESIII detector at the BEPCII collider.
The events are produced using collisions at a center of mass
energy ~GeV. No evidence for hyperon oscillations is observed.
The upper limit for the oscillation rate of to hyperons
is determined to be corresponding to an oscillation
parameter of less than ~GeV
at the 90\% confidence level.Comment: 7 pages, 1 figur
Structural variations in the dithiadiazolyl radicals p-ROC6F4CNSSN (R = Me, Et, nPr, nBu): A case study of reversible and irreversible phase transitions in p-EtOC6F4CNSSN
No full textThe 4′-alkoxy-tetrafluorophenyl dithiadiazolyls, ROC6F4CNSSN [R = Me (1), Et (2), nPr (3), nBu(4)] all adopt cis-oid dimers in the solid state. The methoxy derivative 1 adopts a π-stacked AA’AA’ motif, whereas propoxy (3) and butoxy (4) derivatives exhibit an AA’BB’ stacking. The ethoxy derivative (2) is polymorphic. The α-phase (2α) adopts an AA’BB’ motif comparable with 3 and 4, whereas 2β and 2γ are reminiscent of 1 but combine a mixture of both monomers and dimers in the solid state. The structure of 2β exhibits Z’ = 6 with two dimers and two monomers in the asymmetric unit but undergoes a thermally induced phase transition upon cooling below −25 °C to form 2γ (Z’ = 14) with six dimers and two monomers in the asymmetric unit. The transition is associated with both rotation and translation of the dithiadiazolyl ring. Detailed differential scanning calorimetry and variable temperature powder X-ray diffraction studies coupled with SQUID magnetometry have been used to show that 2α converts irreversibly to 2β upon heating and that 2β and 2γ interconvert through a reversible phase transition with a small thermal hysteresis in its magnetic response.We would like to thank the Canada Research Chairs Program for financial support (J.M.R.), the University of Windsor for a scholarship (Y.B.) and C.F.I./O.R.F. support for infrastructure. We thank the Inorganic Chemistry Exchange (I.C.E.) Program for the opportunity for R.S. to visit U. Windsor. We also acknowledge support from the Ministerio de Economia y Competividad of Spain (Grant No. MAT2015-68200-C2-2-P). Additional support from Diputacion General de Aragon (DGA-M4) is also acknowledged. (J.C. and A.A.)Peer reviewe
Evaluation of the growth-performance and carcass characteristics of commercial pigs produced in Quebec
No full textData for a total of approximately 2900 commercial pigs tested in 12 trials from 1987 to 1990 at the Beaumont test station in Quebec were used to determine the effect of sex, sire breed, cross type and parity number of the dam on growth performance and carcass characteristics. Pigs were housed four to a pen and were fed commercial diets. Feed intake and growth rate were measured during the test, and carcass measurements were taken at slaughter and at 24 or 72 h following slaughter. Castrated males ate more per day, had a better gain and reached slaughter weight (96.4 +/- 5.6 kg) at a younger age than gilts. Gilts had a better carcass yield and were leaner than castrated males. Commercial pigs sired from Duroc or Duroc-Hampshire boars had a growth performance superior to that of pigs sired by Landrace, Yorkshire or Hampshire boars. Progeny from Duroc or Duroc-Hampshire boars also produced carcasses with less loin fat, a thicker loin muscle, a higher estimated lean yield and a better classification index. Pigs from three-way crosses had a higher average daily gain and a better feed conversion than pigs from other types of crosses (single, backcross, four-way, synthetic and purebred), and they reached market weight at a younger age. Most carcass characteristics were also affected by the type of cross, but no specific type of cross was clearly superior to the others for the various variables studied. An increase in parity number of the dam caused a gradual decrease in growth performance, except for pigs from parity six, which presented the best results. There was also a linear decrease in loin muscle thickness, estimated lean yield and classification index and a linear increase in loin fat thickness with increase in parity number of the dam.PT: J; CR: 1985, SAS USERS GUIDE STAT 1991, PROFIL SECTORIEL IND BERESKIN B, 1975, J ANIM SCI, V40, P53 BERESKIN B, 1978, J ANIM SCI, V46, P1581 CHRISTIAN LL, 1980, J ANIM SCI, V51, P51 CUNNINGHAM PJ, 1973, J ANIM SCI, V37, P75 DREWRY KJ, 1981, J ANIM SCI, V52, P197 FAHMY MH, 1977, WORLD REV ANIMAL PRO, V13, P9 GILSTER KE, 1973, J ANIM SCI, V36, P888 GODBOUT D, 1990, C PROUCTION PORCINE, P129 JOHNSON RK, 1978, J ANIM SCI, V46, P69 KENNEDY BW, 1978, ANIM PROD, V27, P29 KORNEGAY ET, 1973, J ANIM SCI, V36, P79 KUHLERS DL, 1981, J ANIM SCI, V53, P40 KUHLERS DL, 1982, J ANIM SCI, V55, P236 LABROUE F, 1992, J RECH PORC FR, V24, P31 LANGLOIS A, 1989, J ANIM SCI, V67, P2018 LEBEAU S, 1990, ANNUAIRE STATISTIQUE, P12 LEGAULT C, 1969, ANN GENET SEL ANIM, V1, P281 MARTEL J, 1988, J ANIM SCI, V66, P41 MARTIN AH, 1980, J ANIM SCI, V50, P699 MILLER HW, 1979, J ANIM SCI, V49, P943 MINVIELLE F, 1986, C PRODUCTION PORCINE, P19 RAMSEY CB, 1990, J ANIM SCI, V68, P148 SALMONLEGAGNEUR E, 1966, ANN ZOOTECH, V15, P215 SATHER AP, 1980, J ANIM SCI, V51, P28 SAVOIE Y, 1988, CAN J ANIM SCI, V68, P1051 SCHNEIDER JF, 1982, J ANIM SCI, V54, P728 SELLIER P, 1981, J RECH PORC FR, V13, P299 SELLIER P, 1982, JOURN RECH PORC FRAN, V14, P159 SHERIDAN AK, 1981, ANIM BREED ABSTR, V49, P131 WILSON ER, 1981, J ANIM SCI, V52, P18 WILSON ER, 1981, J ANIM SCI, V52, P26; NR: 33; TC: 8; J9: CAN J ANIM SCI; PG: 14; GA: MA502Source type: Electronic(1
A Conserved GA Element in TATA-Less RNA Polymerase II Promoters
No full textInitiation of RNA polymerase (Pol) II transcription requires assembly of the pre-initiation complex (PIC) at the promoter. In the classical view, PIC assembly starts with binding of the TATA box-binding protein (TBP) to the TATA box. However, a TATA box occurs in only 15% of promoters in the yeast Saccharomyces cerevisiae, posing the question how most yeast promoters nucleate PIC assembly. Here we show that one third of all yeast promoters contain a novel conserved DNA element, the GA element (GAE), that generally does not co-occur with the TATA box. The distance of the GAE to the transcription start site (TSS) resembles the distance of the TATA box to the TSS. The TATA-less TMT1 core promoter contains a GAE, recruits TBP, and supports formation of a TBP-TFIIB-DNA-complex. Mutation of the promoter region surrounding the GAE abolishes transcription in vivo and in vitro. A 32-nucleotide promoter region containing the GAE can functionally substitute for the TATA box in a TATA-containing promoter. This identifies the GAE as a conserved promoter element in TATA-less promoters
The safety and effectiveness of different methods of ear wax removal: a systematic review and economic evaluation
No full textEar wax (cerumen) is a natural secretion produced to protect the inner ear from dirt and other fragments by moving these particles towards the outer ear. If this process does not happen properly, wax may build up causing blockage in the ear canal and the possibility of impaction. People with a build up of ear wax may suffer from hearing loss, discomfort and, on occasions, infection. It may present problems in assessing hearing, blocking the view of the ear drum during medical examination and interfering with the fitting or function of hearing aids. Although it is thought to affect between 2% and 6% of the population in the England and Wales, some groups may be at a higher risk, such as those using hearing aids or with small ear canals and/or skin conditions. Recurrence is thought to be high among some of these groups. The consequences of the build up of ear wax in the ear canal are thought to be a common reason for consultation and cost in general practice with over 2 million consultations per year in the NHS.Methods of removal of ear wax include drops, flushing with water in general practice, and removal with suction or probes in specialist clinics. The relative safety and benefits of these different methods of removal remains uncertain. This research will systematically review published and unpublished evidence on the clinical and cost effectiveness of different methods for the removal of ear wax. Where appropriate, it will develop an economic model using data from this systematic review and other relevant sources to estimate the relative costs and benefits of different methods. In addition, the project will provide recommendations for future research to try to help answer any remaining areas of uncertainty
Early Risk, Attention, and Brain Activation in Adolescents Born Preterm
No full textThe relations among early cumulative medical risk, cumulative environmental risk, attentional control, and brain activation were assessed in 15 – 16-year-old adolescents who were born preterm. Functional magnetic resonance imaging found frontal, temporal, and parietal cortex activation during an attention task with greater activation of the left superior-temporal and left supramarginal gyri associated with better performance. Individual differences in early cumulative risk are related to patterns of brain activation such that medical risk is related to left parietal cortex activation and environmental risk is related to temporal lobe activation. The findings suggest that early risk is related to less mature patterns of brain activation, including reduced efficiency of processing and responding to stimuli.This is the accepted version of the following article: Carmody, D. P., Bendersky, M., Dunn, S. M., DeMarco, J. K., Hegyi, T., Hiatt, M. and Lewis, M. (2006), Early Risk, Attention, and Brain Activation in Adolescents Born Preterm. Child Development, 77: 384–394, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/j.1467-8624.2006.00877.x/abstract.Peer reviewe
J/ψ Production at High Transverse Momenta in P+p and Au + Au Collisions at √SNN=200 GeV
No full textWe report J/ψ spectra for transverse momenta p[subscript T]> 5GeV/c at mid-rapidity in p+p and Au+Au collisions at √sNN=200GeV. The inclusive J/ψ spectrum and the extracted B-hadron feed-down are compared to models incorporating different production mechanisms. We observe significant suppression of the J/ψ yields for p[subscript T] > 5GeV/c in 0-30% central Au+Au collisions relative to the p+p yield scaled by the number of binary nucleon-nucleon collisions in Au+Au collisions. In 30-60% mid-central collisions, no such suppression is observed. The level of suppression is consistently less than that of high-p[subscript T]π[superscript ±] and low-p[subscript T]J/ψ at RHIC and high-p[subscript T]J/ψ at the LHC. Keywords: J/ψ, suppression, Color-screening, Quarkonium, Heavy-ion collisions, STARNational Science Foundation (U.S.)Alfred P. Sloan Foundatio
Author self-citation in orthodontics is associated with author origin and gender.
No full textBACKGROUND
The aims of this bibliometric study were to determine author self-citation trends in high-impact orthodontic literature and to investigate possible association between self-citation and publication characteristics.
METHODS
Six orthodontic journals with the highest impact factor as ranked by 2017 Journal Citation Reports were screened for a full publication year (2018) for original research articles, reviews, and case reports. Eligible articles were scrutinized for article and author characteristics and citation metrics. Univariable and multivariable negative binomial regression was used to examine associations between self-citation incidence and publication characteristics.
RESULTS
Medians for author self-citation rate of the most self-citing authors and self-citations were 3.03% (range 0-50) and 1 (range 0-19), respectively. In the univariable analysis, there was no association between self-citation counts and study type (P = 0.41), article topic (P = 0.61), number of authors (P = 0.62), and rank of authors (P = 0.56). Author origin (P = 0.001), gender (P = 0.001) and journal (P = 0.05) were associated with self-citation counts and in the multivariable analysis only origin and gender remained strong self-citation predictors. Asian authors and females self-cited significantly less often than all other regions and male authors.
CONCLUSIONS
Authors in orthodontics do not self-cite at a frequency that suggests potential citation manipulation. Author origin and gender were the only variables associated with citations counts. More bibliometric research is necessary to draw solid conclusions about author self-citation trends in orthodontic literature
- …
