359 research outputs found
Zmiany wybranych wlasciwosci i zawartosci makroelementow w podlozach z rzesa wodna pod wplywem wermikompostowania
No full textThe research was carried out over three months under laboratory conditions. 3 litre pots were filled with garden soil, crumbled straw, sewage sludge and a biomass of duckweed Lemna minor (obtained from the sewage treatment plant at Chmielnik near Rzeszów) in various combinations. Some pots were filled with Eisenia fetida (Sav). Others were treated like a control, without earthworms. All samples were systematically watered. Common research methods were used to analyze the substrate.
Vermicomposting of duckweed in every combinations scentless caused its biotransformation and advantageous changes. Produced vermicompost substrates was characterized by good granular structure.
Comparing the substrate types after vermicomposting with their initial state it was noticed the reduction of dry matter content. A tendency was also observed to decreasing organic matter and to increasing the ash content after vermicomposting. The contents of nitrogen, calcium, magnesium and sodium showed a tendency to increase during vermicomposting as compared to those contents from before the experiment.
No changes in the content of phosphorus and potassium after vemicomposting were observed.Doświadczenie prowadzono 3 miesiące w warunkach laboratoryjnych, w plastykowych wazonach, o pojemności 3 litrów, do których wprowadzono ziemią ogrodniczą, rozdrobnioną słomę, osad ściekowy oraz biomasę rzęsy wodnej Lemna minor (pozyskanej z oczyszczalni ścieków w Chmielniku Zdrój k/ Rzeszowa), w różnych kombinacjach. Do części pojemników wprowadzono dżdżownice Eisenia fetida (Sav.). Pozostałe pojemniki traktowano jako kontrolę - bez dżdżownic. Wszystkie podłoża systematycznie zwilżano wodą. Do analizy prób podłoży zastosowano powszechnie przyjęte metody badań.
Wermikompostowanie rzęsy wodnej we wszystkich zastosowanych kombinacjach powodowało jej bezwonną biotransformację i korzystne zmiany. Powstałe podłoża cechowały się dobrą strukturą gruzełkowatą. Porównując podłoża po wermikompostowaniu z materiałem wyjściowym, stwierdzono w nich mniejszą zawartość suchej masy. Zaobserwowano także tendencję obniżania się zawartości substancji organicznej a wzrostu popiołu w podłożach wermikompostowanych. Zawartość azotu, wapnia, magnezu i sodu wykazywała tendencję wzrostu w trakcie wermikompostowania, w stosunku do stanu ich zawartości przed rozpoczęciem badań. Nie stwierdzono zmian w zawartości fosforu i potasu po wermikompostowaniu
A study of K−d and K+d interactions via femtoscopy technique
No full textScattering cross-section measurements have been used to study the strong interaction between charged kaons and (anti-)deuterons. However, these studies have not been successful in determining the scattering lengths of the strong interaction between K+d and K−d. Moreover, the currently available theoretical predictions for the K−d scattering parameter are largely based on input from kaonic
hydrogen measurements, while no theoretical predictions have yet been published for K+d. In this work, the first measurements of the scattering lengths of K+d and K−d particle pairs are presented. The results were obtained using the femtoscopy technique which is very accurate for studying interactions between two particles with low relative momenta
Self-esteem and social support in the occupational stress-subjective health relationship among medical professionals
No full textThe starting point for the presented study was the concept by House who construed social support as buffering the impact of work-related stress on health. Self-esteem was taken under consideration as the other potential stress buffer. It was hypothesized that both social support and self-esteem would have a salutogenic effect, since they attenuate the experience of occupational stress and reduce health problems associated with the experienced job stress. Participants in the study were 361 medical professionals representing various specialties. They were examined using the Subjective Job Evaluation Questionnaire by Dudek et al., the Mood and Health State Questionnaire by Rzesa, the Self-Esteem Scale by M. Rosenberg and Significant Other Scale by Power et al. The higher was the respondents' occupational stress, the poorer was their subjective physical health. Such components of occupational stress as responsibility, psychological strain due to job complexity, lack of rewards at work, and a sense of threat were found to be most important in this respect. These four components of occupational stress were interrelated and constituted a feedback loop. The study confirmed a salutogenic role of self-esteem, contributing to subjective health improvement. Satisfaction with social support had also a positive role, since it reduced the amount of experienced job stress, thus exerting a health-promoting effect. There was a direct negative feedback loop between self-esteem and somatic health problems. Irrespective of that, satisfaction with social support was found to interact with perceived occupational stress in a negative feedback loop. However, neither of these two factors, i.e. self-esteem and social support, had an effect of buffering the impact of occupational stress on health. This suggests that the initial model proposed by House as well as the present author's earlier research findings obtained from a smaller sample should be revised
Femtoscopy analysis of ultra-soft pion trap at energies available at the CERN Large Hadron Collider
No full textFemtoscopy studies of pion radiation in heavy-ion collisions have been conducted extensively at all available collider energies, both theoretically and experimentally. In all these studies a special interest is given to dependency of pion femtoscopy radii, usually approximated by a power-law function at transverse momenta above 200 MeV/. However, the radii behaviour has been much less explored for the ultra-soft pions, possessing the transverse momentum comparable to or lower than the pion mass. For many experimental setups this region is difficult to measure. In this work we present theoretical calculations of pion emission in the ultra-soft region in the two hybrid models -- iHKM and LHYQUID+THERMINATOR2. Along with the particle transverse momentum spectra, we present the calculated femtoscopy radii, both in one-dimensional and three-dimensional representations. We investigate the radii dependence on pair and observe, in particular, a departure from the power-law behaviour at ultra-soft momenta, potentially reflecting a decoupling of such slow pions from the rest of collectively expanding system. We provide the theoretical interpretation of this result and discuss its significance, in particular, for the ongoing non-identical particle femtoscopy analysis for pairs consisting of a pion and a baryon (or of a pion and a charmed meson)
W-+/--boson production in p-Pb collisions at root sNN=8.16 TeV and Pb-Pb collisions at root sNN=5.02 TeV
No full textThe production of the W± bosons measured in p–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision sNN = 8.16 TeV and Pb–Pb collisions at sNN = 5.02 TeV with ALICE at the LHC is presented. The W± bosons are measured via their muonic decay channel, with the muon reconstructed in the pseudorapidity region −4 < ηlabμ < −2.5 with transverse momentum pTμ > 10 GeV/c. While in Pb–Pb collisions the measurements are performed in the forward (2.5 < ycmsμ < 4) rapidity region, in p–Pb collisions, where the centre-of-mass frame is boosted with respect to the laboratory frame, the measurements are performed in the backward (−4.46 < ycmsμ < −2.96) and forward (2.03 < ycmsμ < 3.53) rapidity regions. The W− and W+ production cross sections, lepton-charge asymmetry, and nuclear modification factors are evaluated as a function of the muon rapidity. In order to study the production as a function of the p–Pb collision centrality, the production cross sections of the W− and W+ bosons are combined and normalised to the average number of binary nucleon–nucleon collision 〈N coll〉. In Pb–Pb collisions, the same measurements are presented as a function of the collision centrality. Study of the binary scaling of the W±-boson cross sections in p–Pb and Pb–Pb collisions is also reported. The results are compared with perturbative QCD calculations, with and without nuclear modifications of the Parton Distribution Functions (PDFs), as well as with available data at the LHC. Significant deviations from the theory expectations are found in the two collision systems, indicating that the measurements can provide additional constraints for the determination of nuclear PDFs and in particular of the light-quark distributions. [Figure not available: see fulltext.]
W ± -boson production in p–Pb collisions at s NN = 8.16 TeV and Pb–Pb collisions at s NN = 5.02 TeV
No full textAbstract The production of the W ± bosons measured in p–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision s NN = 8.16 TeV and Pb–Pb collisions at s NN = 5.02 TeV with ALICE at the LHC is presented. The W ± bosons are measured via their muonic decay channel, with the muon reconstructed in the pseudorapidity region −4 10 GeV/c. While in Pb–Pb collisions the measurements are performed in the forward (2.5 < y cms μ < 4) rapidity region, in p–Pb collisions, where the centre-of-mass frame is boosted with respect to the laboratory frame, the measurements are performed in the backward (−4.46 < y cms μ < −2.96) and forward (2.03 < y cms μ < 3.53) rapidity regions. The W − and W+ production cross sections, lepton-charge asymmetry, and nuclear modification factors are evaluated as a function of the muon rapidity. In order to study the production as a function of the p–Pb collision centrality, the production cross sections of the W − and W+ bosons are combined and normalised to the average number of binary nucleon–nucleon collision 〈N coll〉. In Pb–Pb collisions, the same measurements are presented as a function of the collision centrality. Study of the binary scaling of the W ± -boson cross sections in p–Pb and Pb–Pb collisions is also reported. The results are compared with perturbative QCD calculations, with and without nuclear modifications of the Parton Distribution Functions (PDFs), as well as with available data at the LHC. Significant deviations from the theory expectations are found in the two collision systems, indicating that the measurements can provide additional constraints for the determination of nuclear PDFs and in particular of the light-quark distributions
The seroepidemiology of human-papillomavirus in relation to non-melanoma skin cancer
No full textPhDNon-melanoma skin cancer, comprising basal cell carcinoma (BCC) and squamous cell
carcinoma (SCC) is the most commonly diagnosed cancer in Caucasian populations.
Established risk factors include exposure to solar ultra-violet radiation and immunosuppression,
such as that experienced by organ transplant recipients (OTR). A role for cutaneous
human papillomaviruses (HPV) in the aetiology of SCC has been suggested,
but remains uncertain. The aims of this thesis were to examine the association between
SCC and antibodies against the L 1 antigen of 38 HPV types using Luminex technology
among Caucasian individuals and to investigate the seroepidemiology of cutaneous HPV
types. Data came from a small prospective study of 39 cases and 80 controls (the Oxford
component of the European Prospective Investigation into Cancer and Nutrition) and
from case-control studies nested among high-risk cohorts of OTR from London and from
Oxford (119 prevalent cases and 425 controls).
Around 85% of controls were seroactive to at least one HPV type. In the prospective
study, there were no statistically significant differences in the seroprevalence of antibodies
against any of the HPV types examined between incident cases and controls. In the
case-control studies, as expected, antibodies against HPV 16 were associated with a
self-reported history of an abnormal cervical smear and antibodies against HPV 6 were
associated with a self-reported history of genital warts, validating the methodology. However,
no clear associations between any of the HPV types examined (including betaHPVs)
and prevalent SCC were identified. Adjustment for potential confounding factors, such as
self-reported history of sun exposure made no material difference to the results. Limitations
of the studies are the low statistical power and the use of new serological assays.
These serological data do not provide evidence in support of a role for HPV in the aetiology
of cutaneous SCC
First measurement of the vertical bar t vertical bar-dependence of coherent J/psi photonuclear production
No full textThe first measurement of the cross section for coherent J/Psi photoproduction as a function of vertical bar t vertical bar, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb-Pbcollisions at a centre-of-mass energy per nucleon pair root s(NN) = 5.02 TeV with the J/Psi produced in the central rapidity region vertical bar y vertical bar < 0.8, which corresponds to the small Bjorken-xrange (0.3 - 1.4) x 10(-3). The measured vertical bar t vertical bar-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky-Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken- x. (C) 2021 The Author(s). Published by Elsevier B.V
Publisher Correction: Direct observation of the dead-cone effect in quantum chromodynamics (Nature, (2022), 605, 7910, (440-446), 10.1038/s41586-022-04572-w)
No full textIn the version of this article initially published, there was a typographical error in the first sentence following the “Exposing the dead cone” heading, now reading, “The measurements of R(θ), in the three radiator (charmquark) energy intervals 5 < ERadiator < 10 GeV, 10 < ERadiator < 20 GeV and 20 < ERadiator < 35 GeV...,” where “35 GeV” initially appeared as “3 GeV.” The error has been corrected in the HTML and PDF versions of the article. *A list of authors and their affiliations appears online
Papillomatosis and carcinomatosis in the western barred bandicoot (Perameles bougainville)
No full textConservation efforts to prevent the extinction of the endangered western barred bandicoot Perameles bougainville (WBB) are currently hindered by a debilitating progressive papillomatosis and carcinomatosis syndrome. Now extinct on mainland Australia, wild populations of the WBB are known only to exist on Bernier and Dorre Islands in Shark Bay, Western Australia. This thesis describes and analyses the pathological (gross, histological, ultrastructural) and immunohistochemical features of a papillomatosis and carcinomatosis syndrome in the WBB. The detection and characterisation of a novel virus, the bandicoot papillomatosis carcinomatosis virus type 1 (BPCV1), found in association with cutaneous and muco-cutaneous papillomas and carcinomas, is described. BPCV1 was found to exhibit genomic and morphological features of both the Papillomaviridae and the Polyomaviridae, and may represent the first member of a new family of viruses. The findings of this study provide evidence that BPCV1 is the causative agent of the papillomatosis and carcinomatosis syndrome. Clinical, pathological and molecular evidence of the syndrome and BPCV1 were found in the Bernier Island WBB population at Red Cliff and in captive populations comprising all or a proportion of founder WBBs from this site, but not at all in the WBB population on Dorre Island or Heirisson Prong. The papillomatosis and carcinomatosis syndrome in the western barred bandicoot is a pertinent example of a disease process hampering efforts to prevent the extinction of an endangered species
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