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  • 2020-2024  (1.426)
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  • 2020-2024  (1.426)
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  • 1
    Online-Ressource
    Online-Ressource
    American Geophysical Union (AGU) ; 2020
    In:  Journal of Geophysical Research: Planets Vol. 125, No. 11 ( 2020-11)
    In: Journal of Geophysical Research: Planets, American Geophysical Union (AGU), Vol. 125, No. 11 ( 2020-11)
    Kurzfassung: We use spectra acquired by Juno/JIRAM in the range 2–5 μm over a 3‐year period, covering ~22% of Io, to map its surface composition The 2.1‐μm band and the 2.65‐μm band are unrelated with SO 2 frost but display trends possibly related to the transport of volatiles We confirm that the 4.47‐μm band is diagnostic of 32 S 16 O 18 O, and we show that ClSO 2 is not everywhere linked to the abundance of Cl 2 SO 2
    Materialart: Online-Ressource
    ISSN: 2169-9097 , 2169-9100
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2020
    ZDB Id: 1086497-0
    ZDB Id: 3094268-8
    ZDB Id: 2016810-X
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    American Geophysical Union (AGU) ; 2023
    In:  Geophysical Research Letters Vol. 50, No. 1 ( 2023-01-16)
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 50, No. 1 ( 2023-01-16)
    Kurzfassung: We produced a new Io hot spot map based on Juno/JIRAM data We identified 242 hot spots, including 23 previously undetected The latitudinal hot spot distribution is uneven with a larger concentration at the poles
    Materialart: Online-Ressource
    ISSN: 0094-8276 , 1944-8007
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2023
    ZDB Id: 2021599-X
    ZDB Id: 7403-2
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    In: Bulletin of the AAS, American Astronomical Society, Vol. 53, No. 4 ( 2021-03-18)
    Materialart: Online-Ressource
    URL: Issue
    Sprache: Englisch
    Verlag: American Astronomical Society
    Publikationsdatum: 2021
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    In: Astronomy & Astrophysics, EDP Sciences, Vol. 641 ( 2020-9), p. A16-
    Kurzfassung: We investigate the spectral behavior of nine Titan impact craters in order to constrain their composition. Past studies that have examined the chemical composition of impact craters on Titan have either used qualitative comparisons between craters or combined all craters into a single unit, rather than separating them by geographic location and/or degradation state. Here, we use Visual and Infrared Mapping Spectrometer (VIMS) data and a radiative transfer code to estimate the atmospheric contribution to the data, extract the surface albedos of the impact craters, and constrain their composition by using a library of candidate Titan materials, including essentially water ice, tholin, a dark component, and other possible ices at different grain sizes. Following a general characterization of the impact craters, we study two impact crater subunits, the “crater floor” and the “ejecta blanket”. The results show that the equatorial dune craters – Selk, Ksa, Guabonito, and the crater on Santorini Facula – appear to be purely composed of organic material (mainly an unknown dark component). Titan’s midlatitude plain craters – Afekan, Soi, and Forseti – along with Menrva and Sinlap, are enriched in water ice within an organic-based mixture. This follows the geographic pattern observed in our previous work with VIMS data, where the uppermost layers of the midlatitude alluvial fans, undifferentiated plains, and labyrinth terrains were found to consist of a mixture of organics and water ice, while the equatorial plains, hummocky terrains, and dunes were found to consist of a mixture of dark material and tholins. Furthermore, we found that the addition of some form of ice improves the fit in the ejecta spectra of Afekan and Sinlap craters. We find no indication for the presence of either NH 3 or CO 2 ice. Our main results agree with an existing Titan surface evolution scenario, wherein the impact cratering process produces a mixture of organic material and water ice, which is later “cleaned” through fluvial erosion in the midlatitude plains. This cleaning process does not appear to operate in the equatorial regions, which are quickly covered by a thin layer of sand sediment (with the exception of the freshest crater on Titan, Sinlap). Thus, it appears that active processes are working to shape the surface of Titan, and it remains a dynamic world in the present day.
    Materialart: Online-Ressource
    ISSN: 0004-6361 , 1432-0746
    RVK:
    RVK:
    Sprache: Englisch
    Verlag: EDP Sciences
    Publikationsdatum: 2020
    ZDB Id: 1458466-9
    SSG: 16,12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    American Geophysical Union (AGU) ; 2023
    In:  Journal of Geophysical Research: Planets Vol. 128, No. 1 ( 2023-01)
    In: Journal of Geophysical Research: Planets, American Geophysical Union (AGU), Vol. 128, No. 1 ( 2023-01)
    Kurzfassung: Units are described in greater detail as part of the evolving Titan geomorphology mapping schema Empty lakes may reach latitudes as equatorial as 40°N on Titan The Soi crater region is consistent with the narrative of Titan's equatorial and mid‐latitudes being dominated by organic depositional materials
    Materialart: Online-Ressource
    ISSN: 2169-9097 , 2169-9100
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2023
    ZDB Id: 1086497-0
    ZDB Id: 3094268-8
    ZDB Id: 2016810-X
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
    Online-Ressource
    American Astronomical Society ; 2021
    In:  The Planetary Science Journal Vol. 2, No. 4 ( 2021-08-01), p. 142-
    In: The Planetary Science Journal, American Astronomical Society, Vol. 2, No. 4 ( 2021-08-01), p. 142-
    Kurzfassung: Cassini Synthetic Aperture Radar (SAR) images of Titan’s surface revealed river networks strikingly similar to those on Earth. However, Cassini SAR has low spatial resolution and image quality compared to data used to map channels on Earth, so traditional methods for characterizing river networks might not yield accurate results on Titan. We mapped terrestrial analog networks with varying resolutions and image qualities to determine which geomorphologic metrics were invariant with scale or resolution. We found that branching angle and drainage density varied significantly with image resolution, and we therefore expect the actual drainage density of Titan’s channel networks to be significantly higher than the values calculated from Cassini data. Calculated network geometry did not change predictably with resolution and would therefore not be an ideal metric for interpreting Titan’s channel networks. The measured channel width, basin length and width, and drainage area all behaved predictably as resolution varied, leading us to conclude that these metrics could be applied to Cassini data. We then mapped all observable fluvial features on Titan—excluding those in the highly incised labyrinth terrains—visible in the Cassini data set. In our new maps, we observe differences in basin shapes between Titan’s polar and equatorial regions and dichotomies in the relative channel density between the northern and southern midlatitudes and poles of Titan: channels are concentrated at the poles and southern midlatitudes. These patterns may reflect differences in bedrock material and/or different climate histories.
    Materialart: Online-Ressource
    ISSN: 2632-3338
    Sprache: Unbekannt
    Verlag: American Astronomical Society
    Publikationsdatum: 2021
    ZDB Id: 3021068-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    In: TAXON, Wiley, Vol. 71, No. 1 ( 2022-02), p. 178-198
    Kurzfassung: The shortage of reliable primary taxonomic data limits the description of biological taxa and the understanding of biodiversity patterns and processes, complicating biogeographical, ecological, and evolutionary studies. This deficit creates a significant taxonomic impediment to biodiversity research and conservation planning. The taxonomic impediment and the biodiversity crisis are widely recognized, highlighting the urgent need for reliable taxonomic data. Over the past decade, numerous countries worldwide have devoted considerable effort to Target 1 of the Global Strategy for Plant Conservation (GSPC), which called for the preparation of a working list of all known plant species by 2010 and an online world Flora by 2020. Brazil is a megadiverse country, home to more of the world's known plant species than any other country. Despite that, Flora Brasiliensis , concluded in 1906, was the last comprehensive treatment of the Brazilian flora. The lack of accurate estimates of the number of species of algae, fungi, and plants occurring in Brazil contributes to the prevailing taxonomic impediment and delays progress towards the GSPC targets. Over the past 12 years, a legion of taxonomists motivated to meet Target 1 of the GSPC, worked together to gather and integrate knowledge on the algal, plant, and fungal diversity of Brazil. Overall, a team of about 980 taxonomists joined efforts in a highly collaborative project that used cybertaxonomy to prepare an updated Flora of Brazil, showing the power of scientific collaboration to reach ambitious goals. This paper presents an overview of the Brazilian Flora 2020 and provides taxonomic and spatial updates on the algae, fungi, and plants found in one of the world's most biodiverse countries. We further identify collection gaps and summarize future goals that extend beyond 2020. Our results show that Brazil is home to 46,975 native species of algae, fungi, and plants, of which 19,669 are endemic to the country. The data compiled to date suggests that the Atlantic Rainforest might be the most diverse Brazilian domain for all plant groups except gymnosperms, which are most diverse in the Amazon. However, scientific knowledge of Brazilian diversity is still unequally distributed, with the Atlantic Rainforest and the Cerrado being the most intensively sampled and studied biomes in the country. In times of “scientific reductionism”, with botanical and mycological sciences suffering pervasive depreciation in recent decades, the first online Flora of Brazil 2020 significantly enhanced the quality and quantity of taxonomic data available for algae, fungi, and plants from Brazil. This project also made all the information freely available online, providing a firm foundation for future research and for the management, conservation, and sustainable use of the Brazilian funga and flora.
    Materialart: Online-Ressource
    ISSN: 0040-0262 , 1996-8175
    URL: Issue
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2022
    ZDB Id: 2081189-5
    ZDB Id: 204216-2
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    In: British Journal of Surgery, Oxford University Press (OUP), Vol. 108, No. 11 ( 2021-11-11), p. 1274-1292
    Kurzfassung: To support the global restart of elective surgery, data from an international prospective cohort study of 8492 patients (69 countries) was analysed using artificial intelligence (machine learning techniques) to develop a predictive score for mortality in surgical patients with SARS-CoV-2. We found that patient rather than operation factors were the best predictors and used these to create the COVIDsurg Mortality Score (https://covidsurgrisk.app). Our data demonstrates that it is safe to restart a wide range of surgical services for selected patients.
    Materialart: Online-Ressource
    ISSN: 0007-1323 , 1365-2168
    Sprache: Englisch
    Verlag: Oxford University Press (OUP)
    Publikationsdatum: 2021
    ZDB Id: 2006309-X
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    In: British Journal of Surgery, Oxford University Press (OUP), Vol. 108, No. 12 ( 2021-12-01), p. 1448-1464
    Kurzfassung: This study aimed to determine the impact of pulmonary complications on death after surgery both before and during the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic. Methods This was a patient-level, comparative analysis of two, international prospective cohort studies: one before the pandemic (January–October 2019) and the second during the SARS-CoV-2 pandemic (local emergence of COVID-19 up to 19 April 2020). Both included patients undergoing elective resection of an intra-abdominal cancer with curative intent across five surgical oncology disciplines. Patient selection and rates of 30-day postoperative pulmonary complications were compared. The primary outcome was 30-day postoperative mortality. Mediation analysis using a natural-effects model was used to estimate the proportion of deaths during the pandemic attributable to SARS-CoV-2 infection. Results This study included 7402 patients from 50 countries; 3031 (40.9 per cent) underwent surgery before and 4371 (59.1 per cent) during the pandemic. Overall, 4.3 per cent (187 of 4371) developed postoperative SARS-CoV-2 in the pandemic cohort. The pulmonary complication rate was similar (7.1 per cent (216 of 3031) versus 6.3 per cent (274 of 4371); P = 0.158) but the mortality rate was significantly higher (0.7 per cent (20 of 3031) versus 2.0 per cent (87 of 4371); P  & lt; 0.001) among patients who had surgery during the pandemic. The adjusted odds of death were higher during than before the pandemic (odds ratio (OR) 2.72, 95 per cent c.i. 1.58 to 4.67; P  & lt; 0.001). In mediation analysis, 54.8 per cent of excess postoperative deaths during the pandemic were estimated to be attributable to SARS-CoV-2 (OR 1.73, 1.40 to 2.13; P  & lt; 0.001). Conclusion Although providers may have selected patients with a lower risk profile for surgery during the pandemic, this did not mitigate the likelihood of death through SARS-CoV-2 infection. Care providers must act urgently to protect surgical patients from SARS-CoV-2 infection.
    Materialart: Online-Ressource
    ISSN: 0007-1323 , 1365-2168
    Sprache: Englisch
    Verlag: Oxford University Press (OUP)
    Publikationsdatum: 2021
    ZDB Id: 2006309-X
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    In: BJS Open, Oxford University Press (OUP), Vol. 6, No. 1 ( 2022-01-06)
    Kurzfassung: Postoperative acute kidney injury (AKI) is a common complication of major gastrointestinal surgery with an impact on short- and long-term survival. No validated system for risk stratification exists for this patient group. This study aimed to validate externally a prognostic model for AKI after major gastrointestinal surgery in two multicentre cohort studies. Methods The Outcomes After Kidney injury in Surgery (OAKS) prognostic model was developed to predict risk of AKI in the 7 days after surgery using six routine datapoints (age, sex, ASA grade, preoperative estimated glomerular filtration rate, planned open surgery and preoperative use of either an angiotensin-converting enzyme inhibitor or an angiotensin receptor blocker). Validation was performed within two independent cohorts: a prospective multicentre, international study (‘IMAGINE’) of patients undergoing elective colorectal surgery (2018); and a retrospective regional cohort study (‘Tayside’) in major abdominal surgery (2011–2015). Multivariable logistic regression was used to predict risk of AKI, with multiple imputation used to account for data missing at random. Prognostic accuracy was assessed for patients at high risk (greater than 20 per cent) of postoperative AKI. Results In the validation cohorts, 12.9 per cent of patients (661 of 5106) in IMAGINE and 14.7 per cent (106 of 719 patients) in Tayside developed 7-day postoperative AKI. Using the OAKS model, 558 patients (9.6 per cent) were classified as high risk. Less than 10 per cent of patients classified as low-risk developed AKI in either cohort (negative predictive value greater than 0.9). Upon external validation, the OAKS model retained an area under the receiver operating characteristic (AUC) curve of range 0.655–0.681 (Tayside 95 per cent c.i. 0.596 to 0.714; IMAGINE 95 per cent c.i. 0.659 to 0.703), sensitivity values range 0.323–0.352 (IMAGINE 95 per cent c.i. 0.281 to 0.368; Tayside 95 per cent c.i. 0.253 to 0.461), and specificity range 0.881–0.890 (Tayside 95 per cent c.i. 0.853 to 0.905; IMAGINE 95 per cent c.i. 0.881 to 0.899). Conclusion The OAKS prognostic model can identify patients who are not at high risk of postoperative AKI after gastrointestinal surgery with high specificity. Presented to Association of Surgeons in Training (ASiT) International Conference 2018 (Edinburgh, UK), European Society of Coloproctology (ESCP) International Conference 2018 (Nice, France), SARS (Society of Academic and Research Surgery) 2020 (Virtual, UK).
    Materialart: Online-Ressource
    ISSN: 2474-9842
    Sprache: Englisch
    Verlag: Oxford University Press (OUP)
    Publikationsdatum: 2022
    ZDB Id: 2902033-5
    Standort Signatur Einschränkungen Verfügbarkeit
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