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  • 1
    Online Resource
    Online Resource
    Biogeography of testate amoebae in the soils of Mexico
    Springer Science and Business Media LLC ; 2013
    In:  Biodiversity and Conservation Vol. 22, No. 12 ( 2013-11), p. 2837-2855
    Details
    In: Biodiversity and Conservation, Springer Science and Business Media LLC, Vol. 22, No. 12 ( 2013-11), p. 2837-2855
    Type of Medium: Online Resource
    ISSN: 0960-3115 , 1572-9710
    URL: Article
    DOI: 10.1007/s10531-013-0558-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2013
    detail.hit.zdb_id: 2000787-5
    SSG: 12
    SSG: 23
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  • 2
    Online Resource
    Online Resource
    Vertical distribution and soil organic matter composition in a montane cloud forest, Oaxaca, Mexico
    Springer Science and Business Media LLC ; 2012
    In:  European Journal of Forest Research Vol. 131, No. 6 ( 2012-11), p. 1643-1651
    Details
    In: European Journal of Forest Research, Springer Science and Business Media LLC, Vol. 131, No. 6 ( 2012-11), p. 1643-1651
    Type of Medium: Online Resource
    ISSN: 1612-4669 , 1612-4677
    URL: Article
    DOI: 10.1007/s10342-012-0643-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2012
    detail.hit.zdb_id: 2134019-5
    SSG: 23
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  • 3
    Online Resource
    Online Resource
    Artificial chinampas soils of Mexico City: their properties and salinization hazards .
    Frontiers Media SA ; 2014
    In:  Spanish Journal of Soil Science Vol. 1 ( 2014-9-4)
    Details
    In: Spanish Journal of Soil Science, Frontiers Media SA, Vol. 1 ( 2014-9-4)
    Abstract: The chinampas agriculture is a traditional land use practice in the Valley of Mexico since Pre-Hispanic time. The chinampas soils were constructed by excavation of lake sediments that resulted in the creation of a system of islands separated by channels. The agricultural productivity of these artificial soils was high; also the land use practices included forestry, fish breeding and hunting. Nowadays, the chinampas soils are affected by excessive salinity. We studied 10 representative soil profiles in the chinampas zone of Mexico City in order to characterize their properties and origin, to provide their classification, and to evaluate soil salinization, vertical distribution of the salts and their chemical composition. The soils are characterized by a layered structure, uniform dark grey colour, irregular vertical distribution of organic carbon and clay, and high percentage of carbon. Some soils show an increase in organic matter with depth, and other profiles have maximum organic matter content in the surficial layers and in the subsoil. The dynamics of sedimentation resulted in the decrease in organic matter in the upper layers of lacustrine sediments, because of recent increase in erosion rate and consequent increase in the proportion of mineral particles in the sediments. Most probably high organic matter content in surficial layers of some soils is due to excavation and accumulation of organic-rich subsoil material in the course of digging the channels. The concentration of soluble salts in superficial horizons, expressed as electric conductivity, varies in a wide range from 5 to almost 50 dS·m 〈 sup 〉 -1 〈 /sup 〉 . The salts concentrate mainly in the superficial layers of soils. The abundance of the cations of soluble salts is Na 〈 sup 〉 + 〈 /sup 〉 & gt;Mg 〈 sup 〉 2+ 〈 /sup 〉 & gt;Ca 〈 sup 〉 2+ 〈 /sup 〉 & gt;K 〈 sup 〉 + 〈 /sup 〉 and that of the anions is SO 〈 sub 〉 4 〈 /sub 〉 〈 sup 〉 2- 〈 /sup 〉 & gt;Cl 〈 sup 〉 - 〈 /sup 〉 & gt;HCO 〈 sub 〉 3 〈 /sub 〉 〈 sup 〉 - 〈 /sup 〉 & gt;CO 〈 sub 〉 3 〈 /sub 〉 〈 sup 〉 2- 〈 /sup 〉 . The alkaline reaction of soils is caused by exchangeable Na rather than by free sodium carbonates. The restoration of chinampas requires a complex approach, combining soil, water and ecosystems remediation.
    Type of Medium: Online Resource
    ISSN: 2253-6574
    URL: Article
    DOI: 10.3232/SJSS.2011.V1.N1.05
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2014
    detail.hit.zdb_id: 2700695-5
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  • 4
    Online Resource
    Online Resource
    CO2 production in anthropogenic Chinampas soils in Mexico City .
    Frontiers Media SA ; 2014
    In:  Spanish Journal of Soil Science Vol. 2 ( 2014-9-05)
    Details
    In: Spanish Journal of Soil Science, Frontiers Media SA, Vol. 2 ( 2014-9-05)
    Abstract: We studied microbial-associated CО 〈 sub 〉 2 〈 /sub 〉 production in anthropogenic 〈 em 〉 chinampas 〈 /em 〉 soils. The soils were constructed by the accumulation of materials such as organic matter and loamy lacustrine sediments in Pre-Hispanic cultures in Mexico. To study the temperature sensitivity of CО 〈 sub 〉 2 〈 /sub 〉 production related to soil depth, moisture and oxygen availability, soil samples were collected at depths of 0-7, 7-18, 18-30, 30-40 and 40-50 cm. The soil samples were incubated under aerobic and anaerobic conditions at controlled temperatures (-5, 0, 5, 10, 20, 30 °C) and soil moistures of 10, 30, 60 and 90% water-filled pore space. For all the soil depths, incubation temperatures and soil moistures, the mean rate of aerobic CO 〈 sub 〉 2 〈 /sub 〉 production was 58.0 mg CO 〈 sub 〉 2 〈 /sub 〉 kg 〈 sup 〉 -1 〈 /sup 〉 d 〈 sup 〉 -1 〈 /sup 〉 and that of anaerobic CO 〈 sub 〉 2 〈 /sub 〉 production 31.2 mg CO 〈 sub 〉 2 〈 /sub 〉 kg 〈 sup 〉 -1 〈 /sup 〉 d 〈 sup 〉 -1 〈 /sup 〉 , with the highest rate found in the soil samples collected at a depth of 0-7 cm. A decrease in soil organic carbon content inhibited CO 〈 sub 〉 2 〈 /sub 〉 production more under anaerobic than aerobic conditions. The dependence of aerobic СО 〈 sub 〉 2 〈 /sub 〉 production on soil moisture increased at what constituted both unusually high and low temperatures for the study area. Since the response of СО 〈 sub 〉 2 〈 /sub 〉 production to temperature was lower under anaerobic than aerobic conditions, the increase in soil moisture content led to a decrease in the temperature sensitivity of СО 〈 sub 〉 2 〈 /sub 〉 production. The response of microbial activity to other factors may be modified under what constitutes the limiting conditions for any of the factors considered, as follows: (i) when anaerobiosis increases in the soil, the limiting effect of substrate availability on microbial activity increases; (ii) the CO 〈 sub 〉 2 〈 /sub 〉 production rate becomes more dependent on soil moisture under temperature stress; (iii) the sensitivity of CO 〈 sub 〉 2 〈 /sub 〉 production to temperature is highest under drought stress.
    Type of Medium: Online Resource
    ISSN: 2253-6574
    URL: Article
    DOI: 10.3232/SJSS.2012.V2.N2.04
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2014
    detail.hit.zdb_id: 2700695-5
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  • 5
    Online Resource
    Online Resource
    Gas diffusivity in chinampas soils in Mexico City .
    Frontiers Media SA ; 2014
    In:  Spanish Journal of Soil Science Vol. 2 ( 2014-09-05)
    Details
    In: Spanish Journal of Soil Science, Frontiers Media SA, Vol. 2 ( 2014-09-05)
    Abstract: In this laboratory experiment we measured soil gas diffusion coefficients ( 〈 em 〉 D 〈 /em 〉 ) on undisturbed cores of anthropogenic 〈 em 〉 chinampas 〈 /em 〉 soils and tested the validity of some classical gas diffusivity models for predicting the ratio of 〈 em 〉 D 〈 /em 〉 to the gas diffusion coefficient in free air ( 〈 em 〉 D 〈 /em 〉 〈 sub 〉 〈 em 〉 0 〈 /em 〉 〈 /sub 〉 ) as a function of the soil air-filled porosity ( 〈 em 〉 ε 〈 /em 〉 ). The A1 horizon (0-7 cm) of 〈 em 〉 chinampas 〈 /em 〉 soils had the highest gas diffusivity and a linear relationship between 〈 em 〉 D/D 〈 /em 〉 〈 sub 〉 〈 em 〉 0 〈 /em 〉 〈 /sub 〉 and 〈 em 〉 ε 〈 /em 〉 , and thus, the Penman model gave an adequate prediction for this sub-horizon. The Millington-Quirk model was similar to the 〈 em 〉 D/D 〈 /em 〉 〈 sub 〉 〈 em 〉 0 〈 /em 〉 〈 /sub 〉 at all values of 〈 em 〉 ε 〈 /em 〉 for the A2 sub-horizon (7-18 cm) and at 〈 em 〉 ε 〈 /em 〉 & lt; 0.5 cm 〈 sup 〉 3 〈 /sup 〉 cm 〈 sup 〉 -3 〈 /sup 〉 for the A3 (18-30 cm) and A4 (30-50 cm) sub-horizons. Gas diffusivities in 〈 em 〉 chinampas 〈 /em 〉 soils were lower than in mineral soils, as predicted by 〈 em 〉 D/D 〈 /em 〉 〈 sub 〉 〈 em 〉 0 〈 /em 〉 〈 /sub 〉 ( 〈 em 〉 ε 〈 /em 〉 ) models, likely due to the high content of soil organic carbon. The predictive models could be used for the evaluation of greenhouse gases emission from 〈 em 〉 chinampas 〈 /em 〉 soil.
    Type of Medium: Online Resource
    ISSN: 2253-6574
    URL: Article
    DOI: 10.3232/SJSS.2012.V2.N3.02
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2014
    detail.hit.zdb_id: 2700695-5
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  • 6
    Online Resource
    Online Resource
    Soil contribution to CO2 fluxes in Chinampa ecosystems, Mexico
    Frontiers Media SA ; 2020
    In:  Spanish Journal of Soil Science Vol. 10 ( 2020-07-02)
    Details
    In: Spanish Journal of Soil Science, Frontiers Media SA, Vol. 10 ( 2020-07-02)
    Abstract: Since soil CO 〈 sub 〉 2 〈 /sub 〉 flux is a key component of ecosystem carbon balance, quantifying its contribution to the ecosystem carbon flux and understanding the factors that underlie its temporal variation is crucial for a better comprehension of ecosystem carbon dynamics under climate change and for optimal ecosystem use and management. Our objectives were to quantify the contributions of total soil CO 〈 sub 〉 2 〈 /sub 〉 efflux ( 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 ) to ecosystem respiration ( 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 ) and heterotrophic soil CO 〈 sub 〉 2 〈 /sub 〉 efflux ( 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 ) to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 in two 〈 em 〉 chinampa 〈 /em 〉 ecosystems with different natural grass covers. We also aimed to identify the main environmental drivers of seasonal variability of these contributions. The CO 〈 sub 〉 2 〈 /sub 〉 fluxes were measured on each site about every 14 days from September 2008 to August 2009 in the Xochimilco Ecological Park in Mexico City using dark chamber techniques. For two studied sites, 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 , 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 were estimated on average as 94.1 ± 8.5, 34.7 ± 3.5 and 16.5 ± 1.7 (± S.E.) mg C-CO 〈 sub 〉 2 〈 /sub 〉 m 〈 sup 〉 -2 〈 /sup 〉 h 〈 sup 〉 -1 〈 /sup 〉 , respectively. & nbsp;On average over the study period and sites, the annual cumulative 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 , 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 fluxes were 824 ± 74, 304 ± 31 and 145 ± 15 g C m 〈 sup 〉 -2 〈 /sup 〉 year, respectively. The 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 , 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 varied between the winter and summer seasons; this variation was explained mostly by seasonal variations of soil temperature, soil water content and shoot plant biomass. Temperature sensitivity of CO 〈 sub 〉 2 〈 /sub 〉 fluxes depended on vegetation type and plant growth differences among the sites and decreased in the following order: 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 & gt; 〈 em 〉 R 〈 /em 〉 〈 sub 〉 s 〈 /sub 〉 & gt; 〈 em 〉 R 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 . The contribution of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 to 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 for the two studied sites and period averaged about 38% and 50%, respectively regardless of the site vegetation type, but the degree of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 / 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 / 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 variability depended on the differences in seasonal dynamics of plant cover. The contribution of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 varied from 37% in summer to 73% in winter at the site without a seasonal shift in dominant plant species, but 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 / 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 was close to constant during the year at the site with a seasonal change in dominant plant species. During the cold period, the contribution of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 increased following plant growth decrease. The linear regression analysis showed that plant biomass was the dominant factor controlling the seasonal variation of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 / 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 ratios, whereas the plant biomass dynamic followed the dynamics of soil water content, water table depth, and soil temperature. Our results suggest that seasonal variation of soil contribution to total fluxes from the 〈 em 〉 chinampa 〈 /em 〉 ecosystem is locally differentiated. These differences were related to differences in seasonal dynamics of cover productivity which has been associated with localization of soil water content. This finding has important implications for assessing the contribution of the chinampa ecosystem to the global carbon budget.
    Type of Medium: Online Resource
    ISSN: 2253-6574
    URL: Article
    DOI: 10.3232/SJSS.2020.V10.N2.04
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2700695-5
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  • 7
    Online Resource
    Online Resource
    Abatacept, Cenicriviroc, or Infliximab for Treatment of Adults Hospitalized With COVID-19 Pneumonia : A Randomized Clinical Trial
    American Medical Association (AMA) ; 2023
    In:  JAMA Vol. 330, No. 4 ( 2023-07-25), p. 328-
    Details
    In: JAMA, American Medical Association (AMA), Vol. 330, No. 4 ( 2023-07-25), p. 328-
    Abstract: Immune dysregulation contributes to poorer outcomes in COVID-19. Objective To investigate whether abatacept, cenicriviroc, or infliximab provides benefit when added to standard care for COVID-19 pneumonia. Design, Setting, and Participants Randomized, double-masked, placebo-controlled clinical trial using a master protocol to investigate immunomodulators added to standard care for treatment of participants hospitalized with COVID-19 pneumonia. The results of 3 substudies are reported from 95 hospitals at 85 clinical research sites in the US and Latin America. Hospitalized patients 18 years or older with confirmed SARS-CoV-2 infection within 14 days and evidence of pulmonary involvement underwent randomization between October 2020 and December 2021. Interventions Single infusion of abatacept (10 mg/kg; maximum dose, 1000 mg) or infliximab (5 mg/kg) or a 28-day oral course of cenicriviroc (300-mg loading dose followed by 150 mg twice per day). Main Outcomes and Measures The primary outcome was time to recovery by day 28 evaluated using an 8-point ordinal scale (higher scores indicate better health). Recovery was defined as the first day the participant scored at least 6 on the ordinal scale. Results Of the 1971 participants randomized across the 3 substudies, the mean (SD) age was 54.8 (14.6) years and 1218 (61.8%) were men. The primary end point of time to recovery from COVID-19 pneumonia was not significantly different for abatacept (recovery rate ratio [RRR], 1.12 [95% CI, 0.98-1.28] ; P  = .09), cenicriviroc (RRR, 1.01 [95% CI, 0.86-1.18]; P  = .94), or infliximab (RRR, 1.12 [95% CI, 0.99-1.28]; P  = .08) compared with placebo. All-cause 28-day mortality was 11.0% for abatacept vs 15.1% for placebo (odds ratio [OR], 0.62 [95% CI, 0.41-0.94] ), 13.8% for cenicriviroc vs 11.9% for placebo (OR, 1.18 [95% CI 0.72-1.94]), and 10.1% for infliximab vs 14.5% for placebo (OR, 0.59 [95% CI, 0.39-0.90] ). Safety outcomes were comparable between active treatment and placebo, including secondary infections, in all 3 substudies. Conclusions and Relevance Time to recovery from COVID-19 pneumonia among hospitalized participants was not significantly different for abatacept, cenicriviroc, or infliximab vs placebo. Trial Registration ClinicalTrials.gov Identifier: NCT04593940
    Type of Medium: Online Resource
    ISSN: 0098-7484
    URL: Article
    DOI: 10.1001/jama.2023.11043
    RVK:
    XA 10000
    Language: English
    Publisher: American Medical Association (AMA)
    Publication Date: 2023
    detail.hit.zdb_id: 2958-0
    detail.hit.zdb_id: 2018410-4
    SSG: 5,21
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  • 8
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    Online Resource
    Elective surgery system strengthening: development, measurement, and validation of the surgical preparedness index across 1632 hospitals in 119 countries
    Elsevier BV ; 2022
    In:  The Lancet Vol. 400, No. 10363 ( 2022-11), p. 1607-1617
    Details
    In: The Lancet, Elsevier BV, Vol. 400, No. 10363 ( 2022-11), p. 1607-1617
    Type of Medium: Online Resource
    ISSN: 0140-6736
    URL: Article
    DOI: 10.1016/S0140-6736(22)01846-3
    RVK:
    XA 10000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 2067452-1
    detail.hit.zdb_id: 3306-6
    detail.hit.zdb_id: 1476593-7
    SSG: 5,21
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  • 9
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    Online Resource
    Access to and quality of elective care: a prospective cohort study using hernia surgery as a tracer condition in 83 countries
    Elsevier BV ; 2024
    In:  The Lancet Global Health Vol. 12, No. 7 ( 2024-07), p. e1094-e1103
    Details
    In: The Lancet Global Health, Elsevier BV, Vol. 12, No. 7 ( 2024-07), p. e1094-e1103
    Type of Medium: Online Resource
    ISSN: 2214-109X
    URL: Article
    DOI: 10.1016/S2214-109X(24)00142-6
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2024
    detail.hit.zdb_id: 2723488-5
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  • 10
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    Effect of paediatric early warning systems (PEWS) implementation on clinical deterioration event mortality among children with cancer in resource-limited hospitals in Latin America: a prospective, multicentre cohort study
    Elsevier BV ; 2023
    In:  The Lancet Oncology Vol. 24, No. 9 ( 2023-09), p. 978-988
    Details
    In: The Lancet Oncology, Elsevier BV, Vol. 24, No. 9 ( 2023-09), p. 978-988
    Type of Medium: Online Resource
    ISSN: 1470-2045
    URL: Article
    DOI: 10.1016/S1470-2045(23)00285-1
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2049730-1
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