Angular distributions for elastic and inelastic scattering of the
13
C+
208
Pb system have been measured at energies close to the Coulomb barrier, E
lab
= 59.8, 63.8 and 65.8 MeV. Optical Model (OM) ...and coupled channel (CC) analysis were performed using Woods-Saxon and double folding São Paulo potentials. Angular distributions for the J
π
=
3
/
2
-
excited state of
13
C
∗
(3.684 MeV) and J
π
=
3
-
of
208
Pb
∗
(2.615 MeV) were also obtained and analyzed with coupled channels calculations. A good description of the elastic angular distributions was achieved with the inclusion of the 1
n
-stripping contribution in the coupled reaction channel (CRC) calculations.
Microplastics are of major concerns for society and is currently in the focus of legislators and administrations. A small number of measures to reduce or remove primary sources of microplastics to ...the environment are currently coming into effect. At the moment, they have not yet tackled important topics such as food safety. However, recent developments such as the 2018 bill in California are requesting the analysis of microplastics in drinking water by standardized operational protocols. Administrations and analytical labs are facing an emerging field of methods for sampling, extraction, and analysis of microplastics, which complicate the establishment of standardized operational protocols. In this review, the state of the currently applied identification and quantification tools for microplastics are evaluated providing a harmonized guideline for future standardized operational protocols to cover these types of bills. The main focus is on the naked eye detection, general optical microscopy, the application of dye staining, flow cytometry, Fourier transform infrared spectroscopy (FT-Ir) and microscopy, Raman spectroscopy and microscopy, thermal degradation by pyrolysis–gas chromatography–mass spectrometry (py-GC-MS) as well as thermo-extraction and desorption gas chromatography–mass spectrometry (TED-GC-MS). Additional techniques are highlighted as well as the combined application of the analytical techniques suggested. An outlook is given on the emerging aspect of nanoplastic analysis. In all cases, the methods were screened for limitations, field work abilities and, if possible, estimated costs and summarized into a recommendation for a workflow covering the demands of society, legislation, and administration in cost efficient but still detailed manner.
Elastic scattering angular distributions for the 9Be + 80Se system were measured at eleven energies from below to above the Coulomb barrier. The experimental elastic scattering cross sections were ...analyzed within the framework of the optical model to study the energy dependence of the potential. Two different potentials were used: an energy-dependent phenomenological Woods–Saxon potential and a double folding São Paulo potential. For these two potentials, the energy dependence of the real and imaginary strengths shows consistent with the presence of the breakup threshold anomaly. An alternative method is proposed for calculating the dispersion relation between the real and imaginary parts of the optical potential based on bivariate random sampling obtained from the covariance matrix of the adjusted experimental angular distributions.
Podisus nigrispinus Dallas (Heteroptera: Pentatomidae), released in biological control programs, is a predator of Lepidopteran and Coleopteran species. Lemongrass essential oil and its constituents ...can be toxic to this natural enemy. The major constituents of lemongrass essential oil are neral (31.5%), citral (26.1%), and geranyl acetate (2.27%). Six concentrations of lemongrass essential oil and of its citral and geranyl acetate constituents were applied to the thorax of P. nigrispinus nymphs and adults. The walking and respiratory behavior of the P. nigrispinus third-instar nymphs, treated with citral and geranyl acetate at the LD
and LD
doses, were analyzed with video and respirometer. The lemongrass essential oil toxicity increased from first- to fifth-instar P. nigrispinus nymphs. The P. nigrispinus respiration rates (μL de CO
h
/insect) with citral and geranyl acetate in the LD
and LD
differed. Nymphs exposed to the lemongrass essential oil and its constituents on treated surfaces presented irritability or were repelled. Podisus nigrispinus adults were tolerant to the lemongrass essential oil and its constituents, geranyl acetate and citral. The altered respiratory activity with geranyl acetate and the fact that they were irritated and repelled by citral suggest caution with regard to the use of the lemongrass essential oil and its constituents in integrated pest management incorporating this predator, in order to avoid diminishing its efficiency against the pests.
IMPORTANCE: It is unknown whether angiotensin-converting enzyme inhibitors (ACEIs) or angiotensin II receptor blockers (ARBs) have a positive, neutral, or negative effect on clinical outcomes in ...patients with coronavirus disease 2019 (COVID-19). OBJECTIVE: To determine whether discontinuation compared with continuation of ACEIs or ARBs changed the number of days alive and out of the hospital through 30 days. DESIGN, SETTING, AND PARTICIPANTS: A randomized clinical trial of 659 patients hospitalized in Brazil with mild to moderate COVID-19 who were taking ACEIs or ARBs prior to hospitalization (enrolled: April 9-June 26, 2020; final follow-up: July 26, 2020). INTERVENTIONS: Discontinuation (n = 334) or continuation (n = 325) of ACEIs or ARBs. MAIN OUTCOMES AND MEASURES: The primary outcome was the number of days alive and out of the hospital through 30 days. Secondary outcomes included death, cardiovascular death, and COVID-19 progression. RESULTS: Among 659 patients, the median age was 55.1 years (interquartile range IQR, 46.1-65.0 years), 14.7% were aged 70 years or older, 40.4% were women, and 100% completed the trial. The median time from symptom onset to hospital admission was 6 days (IQR, 4-9 days) and 27.2% of patients had an oxygen saturation of less than 94% of room air at baseline. In terms of clinical severity, 57.1% of patients were considered mild at hospital admission and 42.9% were considered moderate. There was no significant difference in the number of days alive and out of the hospital in patients in the discontinuation group (mean, 21.9 days SD, 8 days) vs patients in the continuation group (mean, 22.9 days SD, 7.1 days) and the mean ratio was 0.95 (95% CI, 0.90-1.01). There also was no statistically significant difference in death (2.7% for the discontinuation group vs 2.8% for the continuation group; odds ratio OR, 0.97 95% CI, 0.38-2.52), cardiovascular death (0.6% vs 0.3%, respectively; OR, 1.95 95% CI, 0.19-42.12), or COVID-19 progression (38.3% vs 32.3%; OR, 1.30 95% CI, 0.95-1.80). The most common adverse events were respiratory failure requiring invasive mechanical ventilation (9.6% in the discontinuation group vs 7.7% in the continuation group), shock requiring vasopressors (8.4% vs 7.1%, respectively), acute myocardial infarction (7.5% vs 4.6%), new or worsening heart failure (4.2% vs 4.9%), and acute kidney failure requiring hemodialysis (3.3% vs 2.8%). CONCLUSIONS AND RELEVANCE: Among patients hospitalized with mild to moderate COVID-19 and who were taking ACEIs or ARBs before hospital admission, there was no significant difference in the mean number of days alive and out of the hospital for those assigned to discontinue vs continue these medications. These findings do not support routinely discontinuing ACEIs or ARBs among patients hospitalized with mild to moderate COVID-19 if there is an indication for treatment. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT04364893
In this work we have studied the production of alpha particles emitted as a consequence of different reactions in the 7Li + 144Sm system at near-barrier energies. We have obtained absolute cross ...sections of the total yield at backward angles and at bombarding energies of 24 and 30 MeV. We have also performed complementary exclusive measurements of non-capture breakup processes at 30 MeV. In particular, the neutron transfer followed by non-capture breakup of the 6Li ejectile, which was found to be the dominant process in the studied region, could be accounted for by estimations of a classical dynamical model. This contribution, together with estimations for the incomplete fusion and alpha particle evaporation following compound-nucleus formation, are compared to the experimental inclusive angular distributions obtained in this work.
By combining UV transient absorption spectroscopy with sub-30-fs temporal resolution and CASPT2/MM calculations, we present a complete description of the primary photoinduced processes in solvated ...tryptophan. Our results shed new light on the role of the solvent in the relaxation dynamics of tryptophan. We unveil two consecutive coherent population transfer events involving the lowest two singlet excited states: a sub-50-fs nonadiabatic La → Lb transfer through a conical intersection and a subsequent 220 fs reverse Lb → La transfer due to solvent-assisted adiabatic stabilization of the La state. Vibrational fingerprints in the transient absorption spectra provide compelling evidence of a vibronic coherence established between the two excited states from the earliest times after photoexcitation and lasting until the back-transfer to La is complete. The demonstration of response to the environment as a driver of coherent population dynamics among the excited states of tryptophan closes the long debate on its solvent-assisted relaxation mechanisms and extends its application as a local probe of protein dynamics to the ultrafast time scales.
El presente volumen (número 62 de la colección “Hispano-Americana. Geschichte, Sprache, Literatur”) forma parte de una serie de publicaciones internacionales con un enfoque específico en el campo de ...los estudios hispánicos. Conforman la misma tanto estudios monográficos como volúmenes colectivos en idioma alemán, español, portugués e inglés. Los editores de este número, Angela Schrott y Jan-Henrik Witthaus, son catedráticos de la Universidad de Kassel, Alemania, en Lingüística Románica y Literatura Española e Hispanoamericana, respectivamente.
The caliber of the retinal vessels has been shown to be associated with stroke events. However, the consistency and magnitude of association, and the changes in predicted risk independent of ...traditional risk factors, are unclear. To determine the association between retinal vessel caliber and the risk of stroke events, the investigators combined individual data from 20,798 people, who were free of stroke at baseline, in 6 cohort studies identified from a search of the Medline (National Library of Medicine, Bethesda, Maryland) and EMBASE (Elsevier B.V., Amsterdam, the Netherlands) databases. During follow-up of 5–12 years, 945 (4.5%) incident stroke events were recorded. Wider retinal venular caliber predicted stroke (pooled hazard ratio = 1.15, 95% confidence interval: 1.05, 1.25 per 20-μm increase in caliber), but the caliber of retinal arterioles was not associated with stroke (pooled hazard ratio = 1.00, 95% confidence interval: 0.92, 1.08). There was weak evidence of heterogeneity in the hazard ratio for retinal venular caliber, which may be attributable to differences in follow-up strategies across studies. Inclusion of retinal venular caliber in prediction models containing traditional stroke risk factors reassigned 10.1% of people at intermediate risk into different, mostly lower, risk categories.
Rights in exile Guglielmo Verdirame, Barbara Harrell-Bond
2005., 20050430, 2005, 2005-04-30, 20050101, Letnik:
17
eBook
Of the estimated 12 million refugees in the world, more than 7 million have been confined to camps, effectively "warehoused," in some cases, for 10 years or more. Holding refugees in camps was ...anathema to the founders of the refugee protection regime. Today, with most refugees encamped in the less developed parts of the world, the humanitarian apparatus has been transformed into a custodial regime for innocent people. Based on rich ethnographic data, Rights in Exile exposes the gap between human rights norms and the mandates of international organisations, on the one hand, and the reality on the ground, on the other. It will be of wide interest to social scientists, and to human rights and international law scholars. Policy makers, donor governments and humanitarian organizations, especially those adopting a "rights-based" approach, will also find it an invaluable resource. But it is the refugees themselves who could benefit the most if these actors absorb its lessons and apply them.
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