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Wyświetlanie 1-10 z 12
Autorzy:
Asmussen, N.
Deineka, O.
Herdoíza, G.
Knecht, M.
Stoffer, P.
Bruno, M.
Caprini, I.
Redmer, C.F.
Guellati-Khelifa, S.
Meyer, H.B.
Benayoun, M.
Dominguez, C.A.
Ottnad, K.
Cardoso, N.
Monnard, J.
Eidelman, S.I.
Ignatov, F.
Roberts, B.L.
Serednyakov, S.
Druzhinin, V.P.
Hermansson-Truedsson, N.
Vainshtein, A.
Kupich, A.
Sánchez-Puertas, P.
Nomura, D.
Rodríguez-Sánchez, A.
Zhang, Z.
Shwartz, B.
Koponen, J.
Todyshev, K. Yu.
Van de Water, R.
von Hippel, G.
Curciarello, F.
Roig, P.
Aoyama, T.
Fischer, C.S.
Gelzer, Z.
Logashenko, I.
Leupold, S.
Peris, S.
Gérardin, A.
Davier, M.
Laub, L.
Nyffeler, A.
Davies, C.T.H.
Czyż, H.
Weil, E.
Achasov, M.N.
Hoferichter, M.
Eichmann, G.
Williams, R.
Kubis, B.
Golterman, M.
Wilhelm, J.
Hagelstein, F.
Passera, M.
Simula, S.
Zhevlakov, A.S.
Neil, E.T.
Nio, M.
Bashir, A.
Keshavarzi, A.
Denig, A.
Hörz, B.
Mibe, T.
Gámiz, E.
Colangelo, G.
Perez del Rio, Elena
Danilkin, I.
Blum, T.
Marinković, M.K.
Wittig, H.
Gülpers, V.
DeTar, C.
Kronfeld, A.S.
El-Khadra, A.X.
Lehner, C.
Miura, K.
Carloni Calame, C.M.
Cè, M.
Venanzoni, G.
Chao, E.-H.
Müller, S.E.
Vanderhaeghen, M.
Hatton, D.
McNeile, C.
Hudspith, R.J.
Hoid, B.-L.
Pauk, V.
Della Morte, M.
Charles, J.
Vaquero Avilés-Casco, A.
San José, T.
Radzhabov, A.E.
Izubuchi, T.
Hayakawa, M.
Holz, S.
Kupść, A.
Lellouch, L.
Stöckinger-Kim, H.
Giusti, D.
Fael, M.
Pascalutsa, V.
Portelli, A.
de Rafael, E.
Stöckinger, D.
Bijnens, J.
Laiho, J.
Mohler, D.
Jegerlehner, F.
Masjuan, P.
Maltman, K.
Green, J.R.
Malaescu, B.
Marciano, W.J.
Risch, A.
Kinoshita, T.
Nesterenko, A.V.
Crivellin, A.
Chakraborty, B.
Gottlieb, Steven
Procura, M.
Hertzog, D.W.
Raya, K.
Hoecker, A.
Mackenzie, P.B.
Meyer, A.S.
Dorokhov, A.E.
Jin, L.
Solodov, E.P.
Sugar, R.
Teubner, T.
Opis:
We review the present status of the Standard Model calculation of the anomalous magnetic moment of the muon. This is performed in a perturbative expansion in the fine-structure constant $\alpha$ and is broken down into pure QED, electroweak, and hadronic contributions. The pure QED contribution is by far the largest and has been evaluated up to and including $\mathcal{O}(\alpha^{5})$ with negligible numerical uncertainty. The electroweak contribution is suppressed by $(m_{\mu}/M_{W})^{2}$ and only shows up at the level of the seventh significant digit. It has been evaluated up to two loops and is known to better than one percent. Hadronic contributions are the most difficult to calculate and are responsible for almost all of the theoretical uncertainty. The leading hadronic contribution appears at $\mathcal{O}(\alpha^{2})$ and is due to hadronic vacuum polarization, whereas at $\mathcal{O}(\alpha^{3})$ the hadronic light-by-light scattering contribution appears. Given the low characteristic scale of this observable, these contributions have to be calculated with nonperturbative methods, in particular, dispersion relations and the lattice approach to QCD. The largest part of this review is dedicated to a detailed account of recent efforts to improve the calculation of these two contributions with either a data-driven, dispersive approach, or a first-principle, lattice-QCD approach. The final result reads $a_{\mu}^{SM}= 116 591 810(43) \times 10^{-11}$ and is smaller than the Brookhaven measurement by 3.7 $\sigma$ The experimental uncertainty will soon be reduced by up to a factor four by the new experiment currently running at Fermilab, and also by the future J-PARC experiment. This and the prospects to further reduce the theoretical uncertainty in the near future – which are also discussed here – make this quantity one of the most promising places to look for evidence of new physics.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Work safety interventions and threat complexity - a formative investigation into why farmers do not act safely
Autorzy:
Alwall Svennefelt, C.E.
Hunter, E.
Palsdottir, A.M.
Tematy:
agriculture
extended parallel processing model
fear appeals
occupational injuries
formative research
Safe Farmers
Common Sense
Pokaż więcej
Wydawca:
Instytut Medycyny Wsi
Powiązania:
https://bibliotekanauki.pl/articles/2083063.pdf  Link otwiera się w nowym oknie
Opis:
Introduction. Fear appeals are a common tactic used in work safety interventions to motivate farmers to adopt safer behaviours. They begin by introducing a threat, followed by information on how to remove the threat. However, fear appeals tend to be ineffective when developed without a firm grasp of the cognitive processes underlying behavioural change. Although previous research on farm safety interventions have investigated fear appeals, they have focused on very narrow threats and behaviours, such as tractor or cow safety, while others have studied the threats but not the cognitive processing. Consequently, not enough is known about the range of threats that evoke fear, how farmers behave when under threat, or their general cognitive beliefs regarding self-efficacy, response cost and response efficacy. In In this study, 23 Swedish Farmers were interviewed and participated in a work safety intervention to identify the range of threats farmers perceive, and actions taken to remove those threats. Materials and method. The extended parallel processing model was used to gain insights into how farmers cognitively processed threats and their subsequent behaviour. Interestingly, it was found that farmers were more fearful of work safety threats related to family members and employees—yet the actions they took to reduce threats were mostly personal in nature. To help explain this finding, a typology of threat complexity was developed by the authors. Results. It was found that simple, common, and direct threats to safety tended to lead to adaptive, threat-reducing behaviours, whereas complex, general, or indirect threats promoted more maladaptive behaviours that reduced fear, but not the threats.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impregnating storage materials with neem seed oil against Callosobruchus maculatus Fabricus (Coleoptera: Chrysomelidae: Bruchinae) in Stored Bambara Seeds (Vigna subterranean L.) Verdcourt
Autorzy:
Ojiako, F.O.
Zakka, U.
Dialoke, S.A.
Ahuchaogu, C.E.
Nnebue, O.M.
Izuogu, C.P.
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/11675.pdf  Link otwiera się w nowym oknie
Opis:
Neem (Azadirachta indica A. Juss.) seed oil (NSO) is acclaimed to have some form of insecticidal action against more than 400 insect species in at least 10 to 13 orders. The main delimitating factor in the wide acceptance of this well tested plant as a storage pest bioinsecticide is its foul sulfurous smell and bitter taste which impinges on the acceptability and marketability of treated produce. To ameliorate this shortfall, therefore, an assessment of the potential of impregnating different storage materials; [plastic containers (PLC), Bagco bags (BCB), Black polyethylene bags (BPB), white polyethylene bags (WPB) and calico bags (CAB)], with NSO in the management of Callosobruchus maculatus (F.) in stored Bambara seeds (Vigna subterranea L.), was conducted in the laboratory. The experiment was laid out in a 4 x 5 factorial arrangement fitted into a completely randomized design (CRD). Factor A represented four concentrations of NSO (0.00, 0.50, 1.00, 1.50 ml/ 100g seed), while factor B were the five different storage materials. The treatments were replicated four times Generally, seeds stored with impregnated storage materials recorded more bruchids mortality, reduced oviposition rate, decreased number of emerged insects (F1 and F2) and had less damaged seeds (and hence decreased weevil perforation index, WPI) than the control. Concentration performance was dose related though the highest (1.50 %) did not differ statistically (P=0.05) from the medium (1.00 %) concentration. Seeds stored in BPBs had the highest mortalities, but recorded the lowest in number of eggs oviposited, egg/seed ratio, F1, F2 and cumulative emergence, respectively. These results differed significantly (P=0.05) with the seeds stored in other materials. BPB stored seeds were also the least damaged with lowest exit holes/seed, seeds with holes and WPI, respectively. The performance of BPB was closely followed by seeds stored in WPBs in all the parameters tested. Conversely, seeds stored in BCBs recorded the lowest mortalities but the highest in all other parameters assessed. Other storage materials (PLC and CAB) had better storage quality than BCB materials. Impregnation of storage materials with NSO could be a better option to direct seed application with its attendant drawback. The use of NSO impregnated black polyethylene bags, within the scope of the storage materials screened, to control damage by C. maculatus in stored Bambara seeds, should be encouraged.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differential anti-insect activity of natural products isolated from Dodonaea viscosa Jacq. (Sapindaceae)
Autorzy:
Diaz, M.
Diaz, C.E.
Alvares, R.G.
Gonzalez, A.
Castillo, L.
Gonzalez-Coloma, A.
Seoane, G.
Rossini, C.
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/66684.pdf  Link otwiera się w nowym oknie
Opis:
Botanical biopesticides constitute an important tool for Integrated Pest Management practices. Uruguay has a great potential for developing botanical biopesticides from its abundant native flora. Dodonaea viscosa Jacq. is a native Sapindaceae that in preliminary studies was shown to possess a potential deterrent activity against insect models. In this work, ethanolic extracts of the leaves of this species were studied. Bioguided fractionation and supercritical fluid extraction led to the isolation of active compounds. For that purpose four insect models were used: Epilachna paenulata, Spodoptera littoralis, Myzus persicae, and Rhopalosiphum padi, which are pests of crops of economic importance. Lupeol, stigmasterol, stigmast-7-en-3-ol, and a labdane diterpene were isolated and showed differential activity against the models.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical potential of Ficus species for the control of the phytonematode Meloidogyne javanica
Autorzy:
Alves, J.R.
De Assis, J.N.
Padua, C.C.A.
Balbino, H.M.
Lima, L.L.
De Souza Gouveia, A.
Vital, C.E.
Buonicontro, D.S.
De Freitas, L.G.
Leite, J.P.V.
De Oliveira Ramos, H.J.
Tematy:
gas chromatography/mass spectrometry (GC/MS)
metabolite profiling
pest
control
phytochemistry
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/2082765.pdf  Link otwiera się w nowym oknie
Opis:
Root-knot nematodes, genus Meloidogyne, are among the most plant damaging pathogens worldwide. The action of natural products against plant pathogens has been investigated to assess their effectiveness in the control of diseases. Thus, the present study aimed to evaluate the phytochemistry potential of the Ficus species for the control of Meloidogyne javanica. In vitro inhibitory activity assays were performed with crude ethanolic extracts of leaves and branches from 10 Ficus species. Among these, Ficus carica extracts exhibited strong paralysis activity against second stage juveniles (J2) (EC50 = 134.90 μg ∙ ml–1 ), after 72 hours. In addition, high efficacy was observed in egg-hatching inhibition at different embryonic stages. Microscopy analysis revealed severe morphological alterations in the nematode tissues at the J2 stage, as well as immotility of juveniles released from eggs in the presence of F. carica extracts. The efficacy of the treatments for the other species was very low. These differences were supported by the variation in the compound classes, mainly for alkaloids and metabolite profiles by Gas Chromatography/Mass Spectrometry (GC/MS) when F. carica was compared with the other species. The results indicated that F. carica is a promising source for the isolation and identification of molecules capable of acting in the control of M. javanica.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 12

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