ESTABILIDADE DE AGREGADOS EM ÁREA DE CULTIVO ORGÂNICO COM DIFERENTES MANEJOS E CONVENCIONAL

O objetivo desse trabalho foi avaliar as propriedades físicas do solo em áreas com diferentes manejos do sistema de cultivo orgânico e cultivo convencional. O experimento foi conduzido na Estação Experimental Professor Alcibíades Luiz Orlando, localizada no município de Entre Rios do Oeste. O solo da região é classificado como Latossolo Vermelho Eutroférrico, o delineamento experimental foi inteiramente casualizado (DIC), onde em cada área em estudo foram demarcados seis pontos de amostragem, sendo cada ponto representante de uma repetição dentro da área. Os talhões em estudo e seus respectivos manejos foram considerados os tratamentos e o talhão convencional foi considerado a testemunha. Para determinação da estabilidade coletou-se monólitos de solo na camada de 0-0,10 e 0,10 a 0,20 m. Os resultados demonstraram que a melhor estabilidade dos agregados avaliadas pelo diâmetro médio ponderado e geométrico foi no sistema de rotação: Soja/ trigo mourisco/ aveia preta + nabo/ milho/ aveia preita + nabo/ lab-lab + feijão-guandu; onde houve a maior diversidade de plantas de cobertura. O talhão cultivado no sistema plantio direto, mas manejado convencionalmente obteve menor qualidade estrutural

Propriedades físicas do solo, características agronômicas e produtividade da soja em sucessão a plantas de cobertura

A utilização de plantas de cobertura vem ganhando espaço nos cultivos agrícolas, devido as melhorias que são capazes de proporcionar ao sistema. O trabalho teve como objetivo principal avaliar as propriedades físicas do solo e a produtividade da soja em sucessão ao milho safrinha em consórcio com diferentes plantas de cobertura. O trabalho foi conduzido na propriedade particular, localizada na Linha São João, município de Quatro Pontes (PR). O delineamento experimental utilizado foi de blocos inteiramente ao acaso, contendo quatro tratamentos e cinco repetições. Os tratamentos constituíram-se da cultura da soja semeada após cultivo de milho consorciado com Urochloa brizantha, U. ruziziensis, Avena strigosa (aveia-preta) e testemunha (milho solteiro). Foram avaliados os componentes de produção, a produtividade da soja na sucessão e as propriedades físicas do solo, além da avaliação de produção de matéria seca pelas plantas de cobertura que ficaram no campo após a retirada da cultura do milho. A soja cultivada em sucessão a palhada de U. ruziziensis produziu 33,4% a mais do que na sucessão milho solteiro. As plantas de cobertura de inverno foram capazes de promover melhorias na macroporosidade elevando-a, e na resistência à penetração do solo por meio da descompactação biológica, após o cultivo da soja. Nota-se que as plantas de cobertura favorecem as propriedades físicas do solo, além de promoverem condições satisfatórias para o pleno desenvolvimento da cultura comercial em sucessão, aumentando sua produtividade

Dry matter productivity and soil physical properties after winter cover crops cultivation

The present study aimed to evaluate the dry matter yield of cover crops cultivated in monoculture and intercropped in a no-till system and its effects on the soil physical properties. The experimental design was of randomized blocks, with four replicates. Treatments used were black oat, black oat + forage radish, forage radish, black oat + field pea, field pea and the control (fallow). After 100 days after sowing the cover crops, the dry matter yield was evaluated, with the highest values found in the intercropped crops. After desiccation, undeformed soil samples were collected for the determination of macroporosity, microporosity, total porosity and soil bulk density in the 0 - 0,10; 0,10 - 0,20; 0,20 - 0,30 and 0,30 - 0,40 m layers. Soil penetration resistance was evaluated with a digital penetrometer. The intercrop of black oat with field pea and with forage radish provided the highest dry matter yield, showing the potential of dry matter accumulation in relation to monoculture. The cover crops were capable of improving the macroporosity, bulk density and soil penetration resistance when compared to the fallow area (control); however, they had no influence in soil aggregation due to the high compaction degree in the area

Centenarians’ experience of the COVID pandemic in Switzerland

Being considered as individuals with elevated risk of severe health reactions to the COVID19 infections, governments around the world have put in place wide-ranging measures to protect very old individuals from the virus. In the present study, we investigated centenarians’ experience of the COVID19 pandemic, to reach a better understanding of their vulnerability and resilience. As part of the SWISS100 study, we conducted telephone interviews with 30 centenarians and 40 family members. While almost all centenarians felt not, qualitative data suggested the existence of two groups: One included centenarians lived rather withdrawn and isolated before the crisis and therefore did not experience major changes. The other group included centenarians who suffered substantially from no longer being able to see family and friends and missed valued activities. Family members reported challenges, including centenarians’ decline in mental and physical health. Findings highlight the importance of different vulnerability profiles and lock-down side effects

Depressive symptoms in centenarians during the covid-19 pandemic: findings from the SWISS100 study

Depressive symptoms (DS) are prevalent among older adults (WHO, 2021). However, data on DS appear to be scarce in centenarians. In addition, DS may have been aggravated by the COVID-19 pandemic, especially in centenarians who may have been more susceptible to the negative consequences of pandemic restrictions. Thus, as part of the SWISS100 study (Jopp et al., 2023), we measured DS in centenarians living in Switzerland during the COVID-19 pandemic. Randomly selected centenarians from across the country and their proxies were invited to participate in a telephone interview between December 2020 and June 2022. The study sample was composed of 171 centenarians, with a mean age of 101.8 (SD=1.7) years; 128 (74.9%) participants were female and 63 (36.8%) lived at home. DS were assessed via five selected items of the Geriatric Depression Scale (Sheikh and Yesavage, 1986). The mean DS score was 1.6 (SD=1.6). Considering a cut-off ≥2 (Brañez-Condorena et al., 2021), 75 (43.9%) centenarians were screened positive for possible depression. Further analysis indicated that women had a higher level of DS, and that nursing home residents were more depressed than community-dwelling centenarians. Thus, our study suggests that almost half of the centenarians may have presented with relevant DS during the pandemic in Switzerland, which is notably higher than in other studies. DS in centenarians should be screened systematically, not less so in the context of a health crisis. Depressive symptomatology in the very old is highly relevant for successful professional care and needs further investigation to develop best practice

Where Brain, Body and World Collide

The production cross section of electrons from semileptonic decays of beauty hadrons was measured at mid-rapidity (|y| < 0.8) in the transverse momentum range 1 < pt < 8 Gev/c with the ALICE experiment at the CERN LHC in pp collisions at a center of mass energy sqrt{s} = 7 TeV using an integrated luminosity of 2.2 nb^{-1}. Electrons from beauty hadron decays were selected based on the displacement of the decay vertex from the collision vertex. A perturbative QCD calculation agrees with the measurement within uncertainties. The data were extrapolated to the full phase space to determine the total cross section for the production of beauty quark-antiquark pairs

Pseudorapidity densities of charged particles with transverse momentum thresholds in pp collisions at √ s = 5.02 and 13 TeV

The pseudorapidity density of charged particles with minimum transverse momentum (pT) thresholds of 0.15, 0.5, 1, and 2 GeV/c is measured in pp collisions at the center of mass energies of √s=5.02 and 13 TeV with the ALICE detector. The study is carried out for inelastic collisions with at least one primary charged particle having a pseudorapidity (η) within 0.8pT larger than the corresponding threshold. In addition, measurements without pT-thresholds are performed for inelastic and nonsingle-diffractive events as well as for inelastic events with at least one charged particle having |η|2GeV/c), highlighting the importance of such measurements for tuning event generators. The new measurements agree within uncertainties with results from the ATLAS and CMS experiments obtained at √s=13TeV.

Neutron emission in ultraperipheral Pb-Pb collisions at sNN\sqrt {s_{NN}} = 5.02 TeV

In ultraperipheral collisions (UPCs) of relativistic nuclei without overlap of nuclear densities, the two nuclei are excited by the Lorentz-contracted Coulomb fields of their collision partners. In these UPCs, the typical nuclear excitation energy is below a few tens of MeV, and a small number of nucleons are emitted in electromagnetic dissociation (EMD) of primary nuclei, in contrast to complete nuclear fragmentation in hadronic interactions. The cross sections of emission of given numbers of neutrons in UPCs of $^{208}$Pb nuclei at $\sqrt{s_{\mathrm{NN}}}=5.02$~TeV were measured with the neutron zero degree calorimeters (ZDCs) of the ALICE detector at the LHC, exploiting a similar technique to that used in previous studies performed at $\sqrt{s_{\mathrm{NN}}}=2.76$~TeV. In addition, the cross sections for the exclusive emission of 1, 2, 3, 4 and 5 forward neutrons in the EMD, not accompanied by the emission of forward protons, and thus mostly corresponding to the production of $^{207,206,205,204,203}$Pb, respectively, were measured for the first time. The predictions from the available models describe the measured cross sections well. These cross sections can be used for evaluating the impact of secondary nuclei on the LHC components, in particular, on superconducting magnets, and also provide useful input for the design of the Future Circular Collider (FCC-hh).In ultraperipheral collisions (UPCs) of relativistic nuclei without overlap of nuclear densities, the two nuclei are excited by the Lorentz-contracted Coulomb fields of their collision partners. In these UPCs, the typical nuclear excitation energy is below a few tens of MeV, and a small number of nucleons are emitted in electromagnetic dissociation (EMD) of primary nuclei, in contrast to complete nuclear fragmentation in hadronic interactions. The cross sections of emission of given numbers of neutrons in UPCs of Pb208 nuclei at sNN=5.02 TeV were measured with the neutron zero degree calorimeters (ZDCs) of the ALICE detector at the LHC, exploiting a similar technique to that used in previous studies performed at sNN=2.76 TeV. In addition, the cross sections for the exclusive emission of one, two, three, four, and five forward neutrons in the EMD, not accompanied by the emission of forward protons, and thus mostly corresponding to the production of Pb207,206,205,204,203, respectively, were measured for the first time. The predictions from the available models describe the measured cross sections well. These cross sections can be used for evaluating the impact of secondary nuclei on the LHC components, in particular, on superconducting magnets, and also provide useful input for the design of the Future Circular Collider (FCC-hh).In ultraperipheral collisions (UPCs) of relativistic nuclei without overlap of nuclear densities, the two nuclei are excited by the Lorentz-contracted Coulomb fields of their collision partners. In these UPCs, the typical nuclear excitation energy is below a few tens of MeV, and a small number of nucleons are emitted in electromagnetic dissociation (EMD) of primary nuclei, in contrast to complete nuclear fragmentation in hadronic interactions. The cross sections of emission of given numbers of neutrons in UPCs of $^{208}$Pb nuclei at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV were measured with the neutron zero degree calorimeters (ZDCs) of the ALICE detector at the LHC, exploiting a similar technique to that used in previous studies performed at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. In addition, the cross sections for the exclusive emission of one, two, three, four, and five forward neutrons in the EMD, not accompanied by the emission of forward protons, and thus mostly corresponding to the production of $^{207,206,205,204,203}$Pb, respectively, were measured for the first time. The predictions from the available models describe the measured cross sections well. These cross sections can be used for evaluating the impact of secondary nuclei on the LHC components, in particular, on superconducting magnets, and also provide useful input for the design of the Future Circular Collider (FCC-hh)

Σ(1385)± resonance production in Pb–Pb collisions at √sNN = 5.02 TeV

Hadronic resonances are used to probe the hadron gas produced in the late stage of heavy-ion collisions since they decay on the same timescale, of the order of 1 to 10 fm/c, as the decoupling time of the system. In the hadron gas, (pseudo)elastic scatterings among the products of resonances that decayed before the kinetic freeze-out and regeneration processes counteract each other, the net effect depending on the resonance lifetime, the duration of the hadronic phase, and the hadronic cross sections at play. In this context, the Σ(1385)± particle is of particular interest as models predict that regeneration dominates over rescattering despite its relatively short lifetime of about 5.5 fm/c. The first measurement of the Σ(1385)± resonance production at midrapidity in Pb-Pb collisions at sNN−−−√=5.02 TeV with the ALICE detector is presented in this Letter. The resonances are reconstructed via their hadronic decay channel, Λπ, as a function of the transverse momentum (pT) and the collision centrality. The results are discussed in comparison with the measured yield of pions and with expectations from the statistical hadronization model as well as commonly employed event generators, including PYTHIA8/Angantyr and EPOS3 coupled to the UrQMD hadronic cascade afterburner. None of the models can describe the data. For Σ(1385)±, a similar behaviour as K∗(892)0 is observed in data unlike the predictions of EPOS3 with afterburner