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  1. Article ; Online: Recycling of nutrients from landfill leachate

    Deborah Lucero-Sorbazo / Margarita Beltrán-Villavicencio / Abelardo González-Aragón / Alethia Vázquez-Morillas

    Heliyon, Vol 8, Iss 5, Pp e09540- (2022)

    A case study

    2022  

    Abstract: The continuous increase in the consumption of natural resources requires different solutions directed to the recovery and recycling of different materials and products, including the nutrients used as fertilizers for food production. In this context, ... ...

    Abstract The continuous increase in the consumption of natural resources requires different solutions directed to the recovery and recycling of different materials and products, including the nutrients used as fertilizers for food production. In this context, this research assessed the feasibility of using landfill leachate as a source of nutrients for the growth of maize. Leachate was treated to precipitate struvite, a rich magnesium, phosphate, and ammonium mineral that can be applied directly as fertilizer. It was used for the growth of maize, which was sowed in three different parcels. A commercial DAP + urea mixture was used to compare, and non-fertilized parcels were used as controls. Struvite was successfully obtained and applied in the fields. A marginal higher maize yield was achieved in two sites when using struvite (6.36% and 2.16%) compared to the commercial fertilizer, even if it was applied in a lower dose to weather conditions. An increase in N and Mg in soil could be observed, which allowed for the assimilation of nutrients in the plants. Concerning safety, the use of struvite did not produce the transfer of heavy metals or pathogens to the soil or plants. This research shows a promising way of dealing with leachate, which could be attractive in countries where organic waste is buried in landfills.
    Keywords Phosphorous ; Nitrogen ; Struvite ; Toxicity ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 500
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Corrigendum to “Recycling of nutrients from landfill leachate

    Deborah Lucero-Sobarzo / Margarita Beltrán-Villavicencio / Abelardo González-Aragón / Alethia Vázquez-Morillas

    Heliyon, Vol 8, Iss 9, Pp e10405- (2022)

    A case study” [Heliyon 8 (5) (2022) e09540]

    2022  

    Keywords Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Language English
    Publishing date 2022-09-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Sorption of Total Petroleum Hydrocarbons in Microplastics

    Arely Areanely Cruz-Salas / Maribel Velasco-Pérez / Nayely Mendoza-Muñoz / Alethia Vázquez-Morillas / Margarita Beltrán-Villavicencio / Juan Carlos Alvarez-Zeferino / Sara Ojeda-Benítez

    Polymers, Vol 15, Iss 2050, p

    2023  Volume 2050

    Abstract: As is the case for many others in the world, Mexican seas face complex pollution challenges; two of the contaminants that require special attention for their prevalence, possible chemical interactions, and relation to the country’s economy are leaked ... ...

    Abstract As is the case for many others in the world, Mexican seas face complex pollution challenges; two of the contaminants that require special attention for their prevalence, possible chemical interactions, and relation to the country’s economy are leaked petroleum and microplastics (MP). This research assessed the sorption of total petroleum hydrocarbons (TPH) as fuel oil on microplastics in laboratory and field scenarios. Preliminary tests allowed the development and validation of a methodology to measure the sorbed fuel oil by Soxhlet extraction, with a 99.65% recovery rate. The amount of TPH sorbed in the lab followed the order LDPE > PS > PP > PVC > PET > HDPE, with the highest concentration found on LDPE. The sorption of fuel oil on microplastics is correlated to the surface area of the plastic particles and could also be related to the crystallinity of plastics. Sorption, for all plastics, was consistent with a second-order kinetic model. The analysis of field samples collected on beaches of the Gulf of Mexico varied from 1660 to 35,258 mg/kg MP. It must be noticed that, unlike others, this research quantified a family of contaminants, which could explain the high concentrations observed on microplastics.
    Keywords beach ; Gulf of Mexico ; kinetics ; marine environments ; organic pollutants ; Organic chemistry ; QD241-441
    Subject code 660
    Language English
    Publishing date 2023-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Antibiotic use and outcome in patients with negative blood cultures, a new target population for antimicrobial stewardship interventions: A prospective multicentre cohort (NO-BACT).

    Girón-Ortega, José Antonio / Fernández-Guerrero, Raquel / de Oca Arjona, Montserrat Montes / Galán-Sanchez, Fátima / Sagastizábal, Galadriel Pellejero / Romea, Elena Morte / de Cueto, Marina / Garcia, Margarita Beltrán / Palacios-Baena, Zaira / Jorge, Silvia Jiménez / Rodríguez-Baño, Jesús / Retamar-Gentil, Pilar

    The Journal of infection

    2023  Volume 88, Issue 2, Page(s) 95–102

    Abstract: Objectives: To evaluate the appropriateness of antimicrobial treatment and the risk factors for mortality in patients with negative blood cultures (BC), in order to evaluate whether this population would be a suitable target for antimicrobial ... ...

    Abstract Objectives: To evaluate the appropriateness of antimicrobial treatment and the risk factors for mortality in patients with negative blood cultures (BC), in order to evaluate whether this population would be a suitable target for antimicrobial stewardship (AMS) interventions.
    Methods: A multicentre prospective cohort study of patients with negative BC in three Spanish hospitals between October 2018 and July 2019 was performed. The main endpoints were the appropriateness of antimicrobial treatment (evaluated by two investigators according to local guidelines) and 30-day mortality. Cox-regression was performed to estimate the association between variables and 30-day mortality.
    Results: Of 1011 patients in whom BC was obtained, these were negative in 803 (79%) and were included; 30-day mortality was 9% (70 patients); antibiotic treatment was considered inappropriate in 299 (40%) of 747 patients evaluated at day 2, and in 266 (46%) of 573 at day 5-7. The variables independently associated with increased risk of 30-day mortality were higher age (HR 1.05; 95% CI 1.03-1.07), neoplasia (HR 2.73; 95% CI 1.64-4.56), antibiotic treatment in the 48 h prior to BC extraction (HR 2.06; 95% CI 1.23-3.43) and insufficient antibiotic coverage at day 2 after BC obtainment (HR 2.35; 95% CI 1.39-4.00). Urinary, catheter and biliary sources of infection were associated with lower risk (HR 0.40; 95% CI 0.20-0.81).
    Conclusions: Antimicrobial treatment is frequently inappropriate among patients with negative BC; insufficient antibiotic coverage at day 2 was associated with mortality. These results suggest that patients with negative BC are a suitable population for AS interventions.
    Summary: Antimicrobial treatment in patients with negative blood culture was frequently inappropriate, and inappropriate coverage at day 2 was associated with increased risk of death. These data support the consideration of this population as a potential target for antimicrobial stewardship interventions.
    MeSH term(s) Humans ; Anti-Bacterial Agents/therapeutic use ; Prospective Studies ; Blood Culture ; Antimicrobial Stewardship ; Antibiotic Prophylaxis
    Chemical Substances Anti-Bacterial Agents
    Language English
    Publishing date 2023-11-28
    Publishing country England
    Document type Multicenter Study ; Journal Article
    ZDB-ID 424417-5
    ISSN 1532-2742 ; 0163-4453
    ISSN (online) 1532-2742
    ISSN 0163-4453
    DOI 10.1016/j.jinf.2023.11.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Exploring the Virchow-Robin spaces function

    Iype Cherian / Margarita Beltran / Ekkehard M Kasper / Binod Bhattarai / Sunil Munokami / Giovanni Grasso

    Surgical Neurology International, Vol 7, Iss 27, Pp 711-

    A unified theory of brain diseases

    2016  Volume 714

    Abstract: Background: Cerebrospinal fluid (CSF) transport across the central nervous system (CNS) is no longer believed to be on the conventional lines. The Virchow-Robin space (VRS) that facilitates CSF transport from the basal cisterns into the brain ... ...

    Abstract Background: Cerebrospinal fluid (CSF) transport across the central nervous system (CNS) is no longer believed to be on the conventional lines. The Virchow-Robin space (VRS) that facilitates CSF transport from the basal cisterns into the brain interstitial fluid (ISF) has gained interest in a whole new array of studies. Moreover, new line of evidence suggests that VRS may be involved in different pathological mechanisms of brain diseases. Methods: Here, we review emerging studies proving the feasible role of VRS in sleep, Alzheimer′s disease, chronic traumatic encephalopathy, and traumatic brain injury (TBI). Results: In this study, we have outlined the possible role of VRS in different pathological conditions. Conclusion: The new insights into the physiology of the CSF circulation may have important clinical relevance for understanding the mechanisms underlying brain pathologies and their cure.
    Keywords Alzheimer disease ; chronic traumatic encephalopathy ; cisternostomy ; paravascular pathway ; Virchow-Robin spaces ; Medicine ; R ; Surgery ; RD1-811 ; Internal medicine ; RC31-1245 ; Neurosciences. Biological psychiatry. Neuropsychiatry ; RC321-571 ; Neurology. Diseases of the nervous system ; RC346-429
    Subject code 610 ; 616
    Language English
    Publishing date 2016-01-01T00:00:00Z
    Publisher Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: A conserved supergene locus controls colour pattern diversity in Heliconius butterflies.

    Mathieu Joron / Riccardo Papa / Margarita Beltrán / Nicola Chamberlain / Jesús Mavárez / Simon Baxter / Moisés Abanto / Eldredge Bermingham / Sean J Humphray / Jane Rogers / Helen Beasley / Karen Barlow / Richard H ffrench-Constant / James Mallet / W Owen McMillan / Chris D Jiggins

    PLoS Biology, Vol 4, Iss 10, p e

    2006  Volume 303

    Abstract: We studied whether similar developmental genetic mechanisms are involved in both convergent and divergent evolution. Mimetic insects are known for their diversity of patterns as well as their remarkable evolutionary convergence, and they have played an ... ...

    Abstract We studied whether similar developmental genetic mechanisms are involved in both convergent and divergent evolution. Mimetic insects are known for their diversity of patterns as well as their remarkable evolutionary convergence, and they have played an important role in controversies over the respective roles of selection and constraints in adaptive evolution. Here we contrast three butterfly species, all classic examples of Müllerian mimicry. We used a genetic linkage map to show that a locus, Yb, which controls the presence of a yellow band in geographic races of Heliconius melpomene, maps precisely to the same location as the locus Cr, which has very similar phenotypic effects in its co-mimic H. erato. Furthermore, the same genomic location acts as a "supergene", determining multiple sympatric morphs in a third species, H. numata. H. numata is a species with a very different phenotypic appearance, whose many forms mimic different unrelated ithomiine butterflies in the genus Melinaea. Other unlinked colour pattern loci map to a homologous linkage group in the co-mimics H. melpomene and H. erato, but they are not involved in mimetic polymorphism in H. numata. Hence, a single region from the multilocus colour pattern architecture of H. melpomene and H. erato appears to have gained control of the entire wing-pattern variability in H. numata, presumably as a result of selection for mimetic "supergene" polymorphism without intermediates. Although we cannot at this stage confirm the homology of the loci segregating in the three species, our results imply that a conserved yet relatively unconstrained mechanism underlying pattern switching can affect mimicry in radically different ways. We also show that adaptive evolution, both convergent and diversifying, can occur by the repeated involvement of the same genomic regions.
    Keywords Biology (General) ; QH301-705.5
    Subject code 590
    Language English
    Publishing date 2006-10-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
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