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Sökning: WFRF:(Chavez Alejandro)

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1.
  • Beal, Jacob, et al. (författare)
  • Robust estimation of bacterial cell count from optical density
  • 2020
  • Ingår i: Communications Biology. - : Springer Science and Business Media LLC. - 2399-3642. ; 3:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Optical density (OD) is widely used to estimate the density of cells in liquid culture, but cannot be compared between instruments without a standardized calibration protocol and is challenging to relate to actual cell count. We address this with an interlaboratory study comparing three simple, low-cost, and highly accessible OD calibration protocols across 244 laboratories, applied to eight strains of constitutive GFP-expressing E. coli. Based on our results, we recommend calibrating OD to estimated cell count using serial dilution of silica microspheres, which produces highly precise calibration (95.5% of residuals <1.2-fold), is easily assessed for quality control, also assesses instrument effective linear range, and can be combined with fluorescence calibration to obtain units of Molecules of Equivalent Fluorescein (MEFL) per cell, allowing direct comparison and data fusion with flow cytometry measurements: in our study, fluorescence per cell measurements showed only a 1.07-fold mean difference between plate reader and flow cytometry data.
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2.
  • Chavez-Rodriguez, Mauro F., et al. (författare)
  • Fuel saving strategies in the Andes : long-term impacts for Peru, Colombia and Ecuador
  • 2018
  • Ingår i: Energy Strategy Reviews. - : Elsevier. - 2211-467X .- 2211-4688. ; 20, s. 35-48
  • Tidskriftsartikel (refereegranskat)abstract
    • Crude oil exports and imports play a crucial role in the trade balance of Peru, Colombia and Ecuador. These countries are looking into fossil fuel saving measures as a way to deal with increasing demands and decreasing oil production rates. However, studies about the long-term effects of these measures is lacking. Using a combination of energy simulation technics, 17 fuel saving strategies ranging from fuel switching to the investment in underground transport and hydropower capacity expansion were modelled and assessed to evaluate their long-term effect on fossil fuels demand reduction. Our results show that the full implementation of strategies can account for cumulative oil savings of over 550 million barrels of oil by 2030. Findings also point out that Ecuador and Colombia could face the transition from net oil-exporters to importers as soon as the end of the next decade.
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3.
  • Chávez-Valencia, Venice, et al. (författare)
  • Acute Kidney Injury in COVID-19 Patients : Pathogenesis, Clinical Characteristics, Therapy, and Mortality
  • 2022
  • Ingår i: Diseases. - : MDPI. - 2079-9721. ; 10:3
  • Forskningsöversikt (refereegranskat)abstract
    • Coronavirus disease 2019 (COVID-19) is a disease caused by infection with the SARS-CoV-2 virus and has represented one of the greatest challenges humanity has faced in recent years. The virus can infect a large number of organs, including the lungs and upper respiratory tract, brain, liver, kidneys, and intestines, among many others. Although the greatest damage occurs in the lungs, the kidneys are not exempt, and acute kidney injury (AKI) can occur in patients with COVID-19. Indeed, AKI is one of the most frequent and serious organic complications of COVID-19. The incidence of COVID-19 AKI varies widely, and the exact mechanisms of how the virus damages the kidney are still unknown. For this reason, the purpose of this review was to assess current findings on the pathogenesis, clinical features, therapy, and mortality of COVID-19 AKI.
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4.
  • Elsawy, Mahmoud, et al. (författare)
  • Patient-reported outcomes in ZUMA-7, a phase 3 study of axicabtagene ciloleucel in second-line large B-cell lymphoma
  • 2022
  • Ingår i: Blood. - : American Society of Hematology. - 0006-4971 .- 1528-0020. ; 140:21, s. 2248-2260
  • Tidskriftsartikel (refereegranskat)abstract
    • Here, we report the first comparative analysis of patient-reported outcomes (PROs) with chimeric antigen receptor T-cell therapy vs standard-of-care (SOC) therapy in second-line relapsed/refractory large B-cell lymphoma (R/R LBCL) from the pivotal randomized phase 3 ZUMA-7 study of axicabtagene ciloleucel (axi-cel) vs SOC. PRO instruments were administered at baseline, day 50, day 100, day 150, month 9, and every 3 months from randomization until 24 months or an event-free survival event. The quality of life (QoL) analysis set comprised patients with a baseline and >= 1 follow-up PRO completion. Pre-specified hypotheses for Quality of Life Questionnaire-Core 30 (QLQ-C30) physical functioning, global health status/QoL, and EQ-5D-5L visual analog scale (VAS) were tested using mixed-effects models with repeated measures. Clinically meaningful changes were defined as 10 points for QLQ-C30 and 7 for EQ-5D-5L VAS. Among 359 patients, 296 (165 axi-cel, 131 SOC) met inclusion criteria for QoL analysis. At day 100, statistically significant and clinically meaningful differences in mean change of scores from baseline were observed favoring axi-cel over SOC for QLQ-C30 global health status/QoL (estimated difference 18.1 [95% confidence interval (CI), 12.3-23.9]), physical functioning (13.1 [95% CI, 8.0-18.2]), and EQ-5D-5L VAS (13.7 [95% CI, 8.5-18.8]; P < .0001 for all). At day 150, scores significantly favored axi-cel vs SOC for global health status/QoL (9.8 [95% CI, 2.6-17.0]; P = .0124) and EQ-5D-5L VAS (11.3 [95% CI, 5.4-17.1]; P = .0004). Axi-cel showed clinically meaningful improvements in QoL over SOC. Superior clinical outcomes and favorable patient experience with axi-cel should help inform treatment choices in second-line R/ R LBCL.
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5.
  • Jaiswal, Siddhartha, et al. (författare)
  • Age-Related Clonal Hematopoiesis Associated with Adverse Outcomes.
  • 2014
  • Ingår i: New England Journal of Medicine. - 0028-4793. ; 371:26, s. 2488-2498
  • Tidskriftsartikel (refereegranskat)abstract
    • Background The incidence of hematologic cancers increases with age. These cancers are associated with recurrent somatic mutations in specific genes. We hypothesized that such mutations would be detectable in the blood of some persons who are not known to have hematologic disorders. Methods We analyzed whole-exome sequencing data from DNA in the peripheral-blood cells of 17,182 persons who were unselected for hematologic phenotypes. We looked for somatic mutations by identifying previously characterized single-nucleotide variants and small insertions or deletions in 160 genes that are recurrently mutated in hematologic cancers. The presence of mutations was analyzed for an association with hematologic phenotypes, survival, and cardiovascular events. Results Detectable somatic mutations were rare in persons younger than 40 years of age but rose appreciably in frequency with age. Among persons 70 to 79 years of age, 80 to 89 years of age, and 90 to 108 years of age, these clonal mutations were observed in 9.5% (219 of 2300 persons), 11.7% (37 of 317), and 18.4% (19 of 103), respectively. The majority of the variants occurred in three genes: DNMT3A, TET2, and ASXL1. The presence of a somatic mutation was associated with an increase in the risk of hematologic cancer (hazard ratio, 11.1; 95% confidence interval [CI], 3.9 to 32.6), an increase in all-cause mortality (hazard ratio, 1.4; 95% CI, 1.1 to 1.8), and increases in the risks of incident coronary heart disease (hazard ratio, 2.0; 95% CI, 1.2 to 3.4) and ischemic stroke (hazard ratio, 2.6; 95% CI, 1.4 to 4.8). Conclusions Age-related clonal hematopoiesis is a common condition that is associated with increases in the risk of hematologic cancer and in all-cause mortality, with the latter possibly due to an increased risk of cardiovascular disease. (Funded by the National Institutes of Health and others.).
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6.
  • Lagunas-Rangel, Francisco Alejandro, et al. (författare)
  • FLT3–ITD and its current role in acute myeloid leukaemia
  • 2017
  • Ingår i: Medical Oncology. - : Springer Nature. - 1357-0560 .- 1559-131X. ; 34:6
  • Forskningsöversikt (refereegranskat)abstract
    • FMS-like tyrosine kinase 3 (FLT3) is a proto-oncogene involved in crucial steps of haematopoiesis such as proliferation, differentiation and survival. In recent years, FLT3 has been an important marker in different haematological malignancies, highlighting in acute myeloid leukaemia, where FLT3 mutations have been associated with the clinical prognosis, treatment and survival of patients. The most common form of FLT3 mutation is an internal tandem duplication (ITD) that promotes ligand-independent auto-phosphorylation and constitutive activation of the receptor. FLT3–ITD has been strongly associated with a bad prognosis, leukocytosis, high blast counts, increased risk of relapse and shorter overall survival. In order to improve the clinical condition of FLT3–ITD-positive patients, several FLT3 inhibitors have been developed showing variable results. Currently, the main challenges to be overcome are the different forms of resistance to FLT3 inhibitors. Thus, the purpose of this review is to present, in a general way, the current role that FLT3–ITD mutation plays in patients with AML, with a particular emphasis on the molecular mechanisms associated with clinical prognosis, treatment, and survival of patients.
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8.
  • Lagunas-Rangel, Francisco Alejandro, et al. (författare)
  • Learning of nature : The curious case of the naked mole rat
  • 2017
  • Ingår i: Mechanisms of Ageing and Development. - : Elsevier BV. - 0047-6374 .- 1872-6216. ; 164, s. 76-81
  • Tidskriftsartikel (refereegranskat)abstract
    • Naked mole rats (NMRs) are the longest-living rodents known, living up to approximately 30 years and showing sustained good health. Nowadays, NMRs are considered excellent models for aging and, additionally, for cancer research, due to the evidence of a remarkable cancer resistance demonstrated through thousands of necropsies performed with very few cases that describe this pathology, which is believed to be a disease that unavoidably accompanies aging. Since some years ago, several studies have tried to explain the possible mechanisms underlying longevity and cancer resistance in NMRs through different perspectives and directions, creating new knowledge that subsequently could be used for cancer prevention and delaying aging in humans. Thus, the purpose of this review is to summarize the recent knowledge on naked mole rats with a particular emphasis on the molecular mechanisms associated with their longevity and cancer resistance.
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9.
  • Lagunas-Rangel, Francisco Alejandro, et al. (författare)
  • What do we know about the antibody responses to SARS-CoV-2?
  • 2021
  • Ingår i: Immunobiology. - : Elsevier BV. - 0171-2985 .- 1878-3279. ; 226:2
  • Forskningsöversikt (refereegranskat)abstract
    • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide causing a pandemic with millions of infected people and deaths. Currently, the scientific community is working hard to develop a specific vaccine or treatment. However, since antibody production is an important part of the adaptive immune response, to develop vaccines and therapies, we must understand the antibody response to SARS-CoV-2 infection. In this work, we summarize the most important findings of antibody-mediated immunity against SARS-CoV-2 and highlight its role in the efficient use of plasma from convalescent patients and the direct application of antibodies as treatment.
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10.
  • Lopez-Feldman, Alejandro, 1975, et al. (författare)
  • COVID-19: Impacts on the environment and the achievement of the SDGS in Latin America
  • 2020
  • Ingår i: Desarrollo y Sociedad. - 0120-3584 .- 1900-7760. ; 2020:86, s. 104-132
  • Tidskriftsartikel (refereegranskat)abstract
    • The social and economic effects of the COVID-19 pandemic and the measures to contain it in Latin America could lead to a series of long run consequences that could impact the region’s achievement of the Sustainable Development Goals (SDG). This article is the result of the collaboration of environmental economists from eight of the region’s countries and it discusses the possible pandemic effects on air pollution, deforestation, and other relevant environmental aspects related to the SDG. In addition to reviewing some of the initial effects of the sanitary crisis on the environment, we discuss its potential effects in terms of environmental regulations and public policy interventions. Finally, we discuss a new research agenda with topics derived from the pandemic as well as topics that have recently become more relevant because of it, including its impact on achieving the SDG.
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