Publications by authors named "Segura A"

Background: Studies have shown associations between polygenic risk scores for educational attainment (PRS), cognitive reserve (CR), cognition, negative symptoms (NS), and psychosocial functioning in first-episode psychosis (FEP). However, their specific interactions remain unclear. This study aimed to investigate the mediating roles of CR, cognition, and NS in the relationship between PRS and psychosocial functioning one year after a FEP.

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Psychopathological manifestations and cognitive impairments are core features of psychotic disorders. Polygenic risk scores (PRS) offer insights into the relationships between genetic vulnerability, symptomatology, and cognitive impairments. This study used a network analysis to explore the connections between PRS, cognition, psychopathology, and overall functional outcomes in individuals experiencing a first episode of psychosis (FEP).

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Recent research suggests that a polygeneric immunogen made from the venoms of the most medically important viperid and elapid snakes in sub-Saharan Africa could elicit a broader antibody response in horses compared to the current EchiTAb-plus-ICP antivenom, especially against neurotoxic elapid venoms. To test this, 25 horses that have been regularly immunized to produce this antivenom were reimmunized with an immunogen containing 22 venoms from various snake species from the genera , , , and both spitting and non-spitting . The plasma collected from these horses was processed using the caprylic acid method to produce an industrial-scale freeze-dried antivenom.

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  • The use of veno-arterial (VA) ECMO is an important technique for supporting patients with severe respiratory and cardiovascular issues, especially as a bridge to recovery or transplant.
  • A 77-year-old man with a history of lung transplant faced acute respiratory failure and shock due to CMV pneumonia and required VA ECMO for treatment, receiving significant fluid resuscitation and antibiotics.
  • The case demonstrates the complexities of managing fluid resuscitation in lung transplant patients, highlighting that with proper patient selection and a collaborative medical team, successful outcomes can be achieved.
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  • The venom of Bothrops lanceolatus, a viper species from Martinique, is known to cause thrombosis, particularly in patients bitten by juvenile snakes, prompting research into the underlying mechanisms.
  • The study compared the venoms of juvenile and adult specimens, revealing that juvenile venom induces more significant thrombus formation in mice than adult venom, despite both having similar proteomes.
  • An experimental model showcasing the thrombotic effects of B. lanceolatus venom was established, highlighting the differences in effects between juvenile and adult specimens, and indicating that other factors like metalloproteinase activity may not be solely responsible for thrombus formation.
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  • Snakebite is a significant public health issue in the MENA region, but the extent of the problem is not well understood, and existing antivenoms are often not suitable across different areas.
  • Researchers developed a new antivenom called MENAVip-ICP, created from the plasma of horses that were immunized with various viper venoms from MENA, aiming to provide a more effective and regionally applicable treatment.
  • The new antivenom demonstrated improved effectiveness, particularly through intraperitoneal administration, and showed promise in neutralizing venoms from other geographical regions not included in its initial development.
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Faecal contamination is a widespread environmental and public health problem on recreational beaches around the world. The implementation of predictive models has been recommended by the World Health Organization as a complement to traditional monitoring to assist decision-makers and reduce health risks. Despite several advances that have been made in the modeling of faecal coliforms, tools and algorithms from machine learning are still scarcely used in the field and their implementation in nowcast systems is delayed.

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  • - The study evaluated the effectiveness of dynamic body-feed filtration (DBF) in removing bulky solids from equine hyperimmune plasma during snake antivenom production using caprylic acid, comparing various diatomites for optimal filtration performance.
  • - C1000 diatomite yielded the best results at 90 g/L concentration, demonstrating a recovery of immunoglobulins of 108 ± 4% in a scale-up to 50 L batches, while meeting quality specifications for the antivenoms.
  • - Unlike traditional open filtration systems, DBF offers enhanced microbiological safety due to its closed system design and faster filtration process, making it a cost-effective and compliant alternative for primary clarification in antivenom manufacturing.
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Objective: To evaluate the prognostic utility of baseline frailty, measured by the Risk Analysis Index (RAI), for prediction of postoperative mortality among patients with spinal malignancy (SM) undergoing resection.

Methods: SM surgery cases were queried from the American College of Surgeons - National Surgical Quality Improvement Program database (2011-2020). The relationship between preoperative RAI frailty score and increasing rate of primary endpoint (mortality or discharge to hospice within 30 days, "mortality/hospice") were assessed.

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Background: Cardiovascular disease induces erectile dysfunction modulated by endothelial nitric oxide synthase enzyme and an impaired ejection fraction that restricts penis vascular congestion. However, the mechanisms regulating endothelial dysfunction are not understood.

Objectives: Exploring the functional impact of endothelial nitric oxide synthase genetic polymorphisms on erectile dysfunction and drug therapy optimization in high-risk cardiovascular disease patients.

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PMS2, a Lynch Syndrome gene, presents challenges in genetic testing due to the existence of multiple pseudogenes. This study aims to describe a series of cases harboring a variant in the PMS2CL pseudogene that has been incorrectly assigned to PMS2 with different nomenclatures. We reviewed data from 647 Brazilian patients who underwent multigene genetic testing at a single center to identify those harboring the PMS2 V1:c.

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  • - A recent study focused on patients with previous cardiovascular events, aiming to identify factors related to the time until a recurrence and the impact of LDL cholesterol levels on this timeline.
  • - The study involved 727 adults, tracking their health over an average of 26 months, revealing a 12.38% recurrence rate within two years and highlighting severe depression and high LDL levels as significant risk factors for further events.
  • - Findings suggest that patients with severe depression and persistent high LDL levels should receive immediate interdisciplinary treatment to prevent future cardiovascular issues.
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  • * Researchers compared different types of antiserum produced by immunizing horses with various snake venoms and found that polyspecific antiserum was the most effective at neutralizing venom from multiple species.
  • * The findings support the use of polyspecific immunogens to create antivenoms that can provide broader protection against bites from snakes like Bitis, Echis, and non-spitting Naja in the region.
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Objectives: To compare the observed and forecasted crime trends in Barcelona, using crime statistics from January 2018 to March 2021.

Methods: We trained (seasonal) auto-regressive integrated moving average modelling (95% confidence intervals) using daily recorded crimes from January 2018 to February 2020. These models were then used to forecast crime data from March 2020 to March 2021 across four periods (lockdown, summer, fall and winter).

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Transcriptional regulation controls cellular functions through interactions between transcription factors (TFs) and their chromosomal targets. However, understanding the fate conversion potential of multiple TFs in an inducible manner remains limited. Here, we introduce iTF-seq as a method for identifying individual TFs that can alter cell fate toward specific lineages at a single-cell level.

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Introduction: It is well-known that circulating microRNAs (miRNAs) play a relevant role in many kinds of diseases by regulating the expression of genes involved in various pathophysiologic processes, including erectile dysfunction (ED) and cardiovascular diseases (CVD).

Purpose: This study aimed to identify the miRNA-21 profile in the blood samples of patients with ED, CVD, and the combination of both pathologies to elucidate the potential function of miRNA-21.

Methods: A total of 45 patients with CVD and/or who underwent the erectile function test were included and divided into the following categories: CVD with ED (cases, = 29) and controls (= 16) with either ED or CVD.

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Background: Sub-Saharan African countries have a high burden of viral hepatitis and poor access to screening and care. The aim of this study was to evaluate the feasibility and acceptability of using the plasma separation card (PSC) for viral hepatitis B and C screening among people living with HIV (PLHIV) in Cameroon and Uganda.

Methods: This is a cross-sectional study carried out between 05/2021 and 03/2023 including 192 PLHIV in Cameroon (n = 104) and Uganda (n = 88).

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Species of the Microcystis genus are the most common bloom-forming toxic cyanobacteria worldwide. They belong to a clade of unicellular cyanobacteria whose ability to reach high biomasses during blooms is linked to the formation of colonies. Colonial lifestyle provides several advantages under stressing conditions of light intensity, ultraviolet light, toxic substances and grazing.

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Our planet, which operates as a closed system, is facing increasing entropy due to human activities such as the overexploitation of natural resources and fossil fuel use. The COP28 in Dubai emphasized the urgency to abandon fossil fuels, recognizing them as the primary cause of human-induced environmental changes, while highlighting the need to transition to renewable energies. We promote the crucial role of microbes for sustaining biogenic cycles to combat climate change and the economic potential of synthetic biology tools for producing diverse non-fossil fuels and chemicals, thus contributing to emission reduction in transport and industry.

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 The aim of this study was to evaluate the discriminative accuracy of the preoperative Risk Analysis Index (RAI) frailty score for prediction of mortality or transition to hospice within 30 days of brain tumor resection (BTR) in a large multicenter, international, prospective database.  Records of BTR patients were extracted from the American College of Surgeons National Surgical Quality Improvement Program (2012-2020) database. The relationship between the RAI frailty scale and the primary end point (mortality or discharge to hospice within 30 days of surgery) was assessed using linear-by-linear proportional trend tests, logistic regression, and receiver operating characteristic (ROC) curve analysis (area under the curve as C-statistic).

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Objective: The purpose of this study was to apply contemporary consensus criteria developed by the Society for Cardiovascular Pathology and the Association for European Cardiovascular Pathology to the evaluation of aortic pathology, with the expectation that the additional pathologic information may enhance the understanding and management of aortic diseases.

Methods: A scoring system was applied to ascending aortic specimens from 42 patients with heritable thoracic aortic disease and known genetic variations and from 86 patients from a single year, including patients with known genetic variations (n = 12) and patients with sporadic disease (n = 74).

Results: The various types of lesions of medial degeneration and the overall severity of medial degeneration overlapped considerably between those patients with heritable disease and those with sporadic disease; however, patients with heritable thoracic aortic disease had significantly more overall medial degeneration (P = .

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Schizophrenia and bipolar disorder exhibit substantial clinical overlap, particularly in individuals at familial high risk, who frequently present sub-threshold symptoms before the onset of illness. Severe mental disorders are highly polygenic traits, but their impact on the stages preceding the manifestation of mental disorders remains relatively unexplored. Our study aimed to examine the influence of polygenic risk scores (PRS) on sub-clinical outcomes over a 2-year period in youth at familial high risk for schizophrenia and bipolar disorder and controls.

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