989 results match your criteria Piedra


Do Latino Older Adults and service Providers Agree on Positive Aging? Using Concept Mapping to Compare Perspectives.

Gerontologist 2022 May 27. Epub 2022 May 27.

NORC at the University of Chicago, Chicago, Illinois, USA.

Background And Objectives: In the United States, Latino adults are a growing segment of the aging population who will need research-informed interventions to help them age successfully. Arguably, how Latino older adults and service providers understand "positive aging" serves as an important precursor for the cultivation of such interventions. This investigation explored whether Latino older adults' conceptualizations of positive aging aligned with those of service providers. Read More

View Article and Full-Text PDF

Zoonotic Transmission of Diphtheria from Domestic Animal Reservoir, Spain.

Emerg Infect Dis 2022 06;28(6):1257-1260

Toxigenic Corynebacterium ulcerans is as an emerging zoonotic agent of diphtheria. We describe the zoonotic transmission of diphtheria caused by toxigenic C. ulcerans from domestic animals in Spain, confirmed by core-genome multilocus sequence typing. Read More

View Article and Full-Text PDF

Incremental levels of diagnostic information incentivize health-seeking in non-alcoholic fatty liver: a randomized clinical trial.

Sci Rep 2022 May 18;12(1):8272. Epub 2022 May 18.

Obesity and Digestive Diseases Unit and Translational Research Unit, Medica Sur Clinic and Foundation, Puente de Piedra 150 Col. Toriello Guerra Tlalpan, 14050, Mexico City, Mexico.

Patients with chronic disorders like non-alcoholic fatty liver disease (NAFLD) face important challenges adhering to diagnostic and treatment tracks. As NAFLD increases, the need to incentivize health-seeking behaviors grows. No evidence-based interventions to address this gap exist. Read More

View Article and Full-Text PDF

Adult Memory T Cell Responses to the Respiratory Syncytial Virus Fusion Protein During a Single RSV Season (2018-2019).

Front Immunol 2022 29;13:823652. Epub 2022 Mar 29.

Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, United States.

Respiratory Syncytial Virus (RSV) is ubiquitous and re-infection with both subtypes (RSV/A and RSV/B) is common. The fusion (F) protein of RSV is antigenically conserved, induces neutralizing antibodies, and is a primary target of vaccine development. Insight into the breadth and durability of RSV-specific adaptive immune response, particularly to the F protein, may shed light on susceptibility to re-infection. Read More

View Article and Full-Text PDF

Analysis of Mesquite () Protein Concentrate for Possible Use as Supplementary Protein.

Int J Food Sci 2022 24;2022:7621818. Epub 2022 Feb 24.

Grupo de Investigación en Innovación y Desarrollo Agropecuario y Agroindustrial (IIDAA), Universidad de Cartagena, Campus Piedra de Bolívar, Cartagena de Indias 130015, Colombia.

Vulnerable populations in developing countries need new protein sources, such as protein concentrates from accessible sources at low economic costs. The main objective of this study was at evaluating the nutritional quality of the protein concentrate of the legume mesquite (), compared with the protein values of other legumes described in literature. For this purpose, flour and protein concentrates from mesquite were obtained, along with their chemical composition. Read More

View Article and Full-Text PDF
February 2022

Internal and External Load Control in Team Sports through a Multivariable Model.

J Sports Sci Med 2021 12 1;20(4):751-758. Epub 2021 Oct 1.

Sport and Physical Activity Studies Centre, University of Vic-Central University of Catalonia, Barcelona, Spain.

Data related to 141 sessions of 10 semi-professional basketball players were analyzed during the competitive period of the 2018-2019 season using a multivariable model to determine possible associations between internal and external load variables and fatigue. Age, height, weight, sessional rate of perceived exertion (sRPE), summated-heart-rate-zones, heart rate variability, total accelerations and decelerations were the covariates, and post-session countermovement jump loss (10% or higher) the response variable. Based on the results observed, a rise in sRPE and accelerations and decelerations could be associated with increased lower-body neuromuscular fatigue. Read More

View Article and Full-Text PDF
December 2021

Multiple Respiratory Syncytial Virus (RSV) Strains Infecting HEp-2 and A549 Cells Reveal Cell Line-Dependent Differences in Resistance to RSV Infection.

J Virol 2022 04 14;96(7):e0190421. Epub 2022 Mar 14.

Department of Molecular Virology and Microbiology, Baylor College of Medicinegrid.39382.33, Houston, Texas, USA.

Respiratory syncytial virus (RSV) is a leading cause of pediatric acute respiratory infection worldwide. There are currently no approved vaccines or antivirals to combat RSV disease. A few transformed cell lines and two historic strains have been extensively used to study RSV. Read More

View Article and Full-Text PDF

Prognostic effect of body mass index in patients with advanced NSCLC treated with chemoimmunotherapy combinations.

J Immunother Cancer 2022 02;10(2)

Department of Medicine and Surgery, University of Parma, Parma, Italy.

Introduction: It has been recognized that increasing body mass index (BMI) is associated with improved outcome from immune checkpoint inhibitors (ICIs) in patients with various malignancies including non-small cell lung cancer (NSCLC). However, it is unclear whether baseline BMI may influence outcomes from first-line chemoimmunotherapy combinations.

Methods: In this international multicenter study, we evaluated the association between baseline BMI, progression-free survival (PFS) and overall survival (OS) in a cohort of patients with stage IV NSCLC consecutively treated with first-line chemoimmunotherapy combinations. Read More

View Article and Full-Text PDF
February 2022

First report of Clonostachys rosea causing root rot on garlic in Mexico.

Plant Dis 2022 Feb 16. Epub 2022 Feb 16.

universidad autonoma de aguascalientes, fitotecnia, av universidad No 940 col ciudad universitaria, Aguascalientes, Aguascalientes, Mexico, 20131.

Garlic (Allium sativum) is an important crop worldwide and it is widely grown and used in different industries to manufacture food, pharmaceutical, and insecticidal products. (Shang et al., 2019, Velsankar et al. Read More

View Article and Full-Text PDF
February 2022

The Human Nose Organoid Respiratory Virus Model: an Human Challenge Model To Study Respiratory Syncytial Virus (RSV) and Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Pathogenesis and Evaluate Therapeutics.

mBio 2022 Feb 15:e0351121. Epub 2022 Feb 15.

Department of Molecular Virology and Microbiology, Baylor College of Medicinegrid.39382.33, Houston, Texas, USA.

There is an unmet need for preclinical models to understand the pathogenesis of human respiratory viruses and predict responsiveness to immunotherapies. Airway organoids can serve as an human airway model to study respiratory viral pathogenesis; however, they rely on invasive techniques to obtain patient samples. Here, we report a noninvasive technique to generate human nose organoids (HNOs) as an alternative to biopsy-derived organoids. Read More

View Article and Full-Text PDF
February 2022

Latinos and the Pandemic: Results from the National Social Life, Health, and Aging Project-COVID-19 Study.

J Appl Gerontol 2022 May 12;41(5):1465-1472. Epub 2022 Feb 12.

Academic Research Centers, 50478NORC at the University of Chicago, Chicago, IL, USA.

Pre-pandemic disparities placed Latinos at risk for COVID-19. This report describes the associations between and and the uneven distribution of COVID-19 morbidity among Latino older adults using data from the recently released supplement to the National Social Life, Heath, and Aging Project (NSHAP) ( = 2672), a population-based panel study of adults born 1920-1965. Logistic regression revealed that material hardship and reliance on outside help were significantly correlated with COVID-19 infection, which may partially explain the disproportionate burden Latinos experience during the pandemic. Read More

View Article and Full-Text PDF

White Piedra: An Uncommon Superficial Fungal Infection of Hair.

Skin Appendage Disord 2022 Jan 5;8(1):34-37. Epub 2021 Aug 5.

Department of Microbiology, University College of Medical Sciences/University of Delhi/Guru Teg Bahadur Hospital, New Delhi, India.

White piedra is a superficial fungal infection of hair caused by species. It presents clinically as white nodules encasing the hair shafts and may lead to increased fragility. It can usually be differentiated easily from clinically similar conditions based on clinical and microbiologic features. Read More

View Article and Full-Text PDF
January 2022

Convivir (to Coexist) and Other Insights: Results From the Positive Aging for Latinos Study.

J Appl Gerontol 2022 May 31;41(5):1421-1434. Epub 2022 Jan 31.

14681University of Illinois at Chicago, Chicago, IL, USA.

Many Latinos in the United States do not have access to culturally sensitive services to help them age well. We combined community-based participatory research with concept mapping methods to understand how a sample of community-dwelling Latino older adults view positive aging. Nine focus groups ( = 101) generated 85 non-repeating statements, which were used to produce a final map with 11 clusters, organized into four overarching regions: (To Coexist), Self-Sufficiency, Perspectives on Life, and Healthy Behaviors. Read More

View Article and Full-Text PDF

Homologous and Heterologous Covid-19 Booster Vaccinations.

N Engl J Med 2022 03 26;386(11):1046-1057. Epub 2022 Jan 26.

From the Departments of Medicine and Molecular Virology and Microbiology, Baylor College of Medicine, Houston (R.L.A., H.M.E.S.), and Sealy Institute for Vaccine Sciences, University of Texas Medical Branch, Galveston (R.E.R.); the Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore (K.E.L., M.E.D., K.M.N.), and the Division of Microbiology and Infectious Diseases (S.C., S.U.N., P.C.R., J.H.B.) and the Vaccine Research Center (A.B.M., S.E.O.), National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda; Kaiser Permanente Washington Health Research Institute (L.A.J.), the Departments of Medicine (C.J., T.M.B., M.J. McElrath) and Laboratory Medicine and Pathology (C.J., C.M.P.), University of Washington, the Vaccine and Infectious Disease Division (C.J., C.M.P., C.P.D.I., E.R.B., M.J. McElrath) and the Statistical Center for HIV/AIDS Research and Prevention (D.S., J.A.Z.), Fred Hutchinson Cancer Research Center, and Seattle Children's Research Institute (R.N.C.) and the Department of Pediatrics (R.N.C.), University of Washington School of Medicine, Seattle; the Department of Medicine, Division of Infectious Diseases, University of Rochester, Rochester (A.R.B., D.D.), NYU Langone Vaccine Center and Division of Infectious Diseases and Immunology, Department of Medicine, NYU Grossman School of Medicine, New York (M.J. Mulligan, A.C.K.), and NYU Langone Hospital-Long Island Vaccine Center Research Clinic and the Division of Infectious Disease, Department of Medicine, NYU Long Island School of Medicine, Mineola (M.B.) - all in New York; the Departments of Pediatrics (C.A.R.), Microbiology and Immunology (M.S.S.), and Medicine (S.E., D.S.S.), the Center for Childhood Infections and Vaccines (C.A.R.), Hope Clinic of Emory Vaccine Center (S.E.), Emory Vaccine Center, and Yerkes National Primate Research Center (M.S.S.), Emory University School of Medicine, Emory University, and Children's Healthcare of Atlanta (C.A.R.) - all in Atlanta; the Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh (J.M.M., K.R.); Cincinnati Children's Hospital Medical Center, Division of Infectious Diseases, University of Cincinnati College of Medicine, Cincinnati (R.C.B., R.W.F.); and FHI 360 (formerly Family Health International) (J.I.A.) and Duke Human Vaccine Institute (D.C.M.) and the Department of Surgery (D.C.M., A.E.), Duke University Medical Center, Durham, NC.

Background: Although the three vaccines against coronavirus disease 2019 (Covid-19) that have received emergency use authorization in the United States are highly effective, breakthrough infections are occurring. Data are needed on the serial use of homologous boosters (same as the primary vaccine) and heterologous boosters (different from the primary vaccine) in fully vaccinated recipients.

Methods: In this phase 1-2, open-label clinical trial conducted at 10 sites in the United States, adults who had completed a Covid-19 vaccine regimen at least 12 weeks earlier and had no reported history of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection received a booster injection with one of three vaccines: mRNA-1273 (Moderna) at a dose of 100 μg, Ad26. Read More

View Article and Full-Text PDF

Sustainable Design Approach for Modeling Bioprocesses from Laboratory toward Commercialization: Optimizing Chitosan Production.

Polymers (Basel) 2021 Dec 22;14(1). Epub 2021 Dec 22.

Chemical Engineering Program, Universidad EAN, Street 71 #9-84, Bogota 111311, Colombia.

Enhancing the biochemical supply chain towards sustainable development requires more efforts to boost technology innovation at early design phases and avoid delays in industrial biotechnology growth. Such a transformation requires a comprehensive step-wise procedure to guide bioprocess development from laboratory protocols to commercialization. This study introduces a process design framework to guide research and development (R&D) through this journey, bearing in mind the particular challenges of bioprocess modeling. Read More

View Article and Full-Text PDF
December 2021

Intraspecific virulence of entomopathogenic nematodes against the pests (Thysanoptera: Thripidae) and (Lepidoptera: Gelechiidae).

J Nematol 2021 14;53. Epub 2021 Dec 14.

R&D Department of Koppert España, S.L. Paraje Piedra Rodada, 470, Vícar, Almería 04738, Spain.

Entomopathogenic nematodes (EPN) are excellent biocontrol agents against various insect pests. Novel biotechnological approaches can enhance their utility against insects above-ground, opening a new venue for selecting superior EPN against certain insects. We hypothesize that different populations of the same species but from different origins (habitat, ecoregion) will differ in their virulence. Read More

View Article and Full-Text PDF
December 2021

Detecting Risk of Neglect in NSHAP Round 3 Using New Follow-Up Questions to Activities of Daily Living Measures.

J Gerontol B Psychol Sci Soc Sci 2021 12;76(Suppl 3):S348-S362

Department of Sociology, University of Chicago, Chicago, Illinois, USA.

Objectives: Elder neglect is a type of elder abuse wherein an older adult's basic needs remain unmet through negligence. The risk of neglect and its harmful consequences coincides with the need for care that arises with difficulties completing activities of daily living (ADLs) and instrumental activities of daily living (IADLs). In this paper, we describe how new questions included in Round 3 (2015-2016) of the National Social Life, Health, and Aging Project (NSHAP-R3) can help detect the risk of elder neglect. Read More

View Article and Full-Text PDF
December 2021

Efficacy and Safety of NVX-CoV2373 in Adults in the United States and Mexico.

N Engl J Med 2022 Feb 15;386(6):531-543. Epub 2021 Dec 15.

From Novavax, Gaithersburg (L.M.D., G.A., K.S., W.W., I.C., G.M.G., F.D.), the University of Maryland School of Medicine, Baltimore (K.L.K., M.A.M., K.M.N.), the National Institute of Allergy and Infectious Diseases, Bethesda (J.H.), and Walter Reed Army Institute of Research, Silver Spring (J.A.A.) - all in Maryland; FAICIC Clinical Research, Veracruz (A.Q.B.H.), and Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City (G.M.R.-P.) - both in Mexico; Research Your Health, Plano (J.M.A.) and the Texas Center for Drug Development, Houston (V.G.-F.) - both in Texas; M3-Wake Research, Raleigh (W.L.H.), M3-Emerging Medical Research, Durham (D.B.M.), and the University of North Carolina School of Medicine, Chapel Hill (C.L.G.) - all in North Carolina; SIMEDHealth, Gainesville (D.M.D.), and Velocity Clinical Research, Hallandale Beach (B.E.S.) - both in Florida; the University of Nebraska Medical Center, Omaha (D.F.F.); the University of Washington Medical Center (R.S.M., R.W.C., A.L.G.) and Fred Hutchinson Cancer Research Center (L.C.), Seattle, and Lummi Indian Health Center, Bellingham (D.C.L.) - all in Washington; the Atlanta Center for Medical Research, Atlanta (R.A.R.), and IACT Health, Columbus (J.K.K.) - both in Georgia; Velocity Clinical Research-Providence, Warwick, RI (D.L.F.); WR ClinSearch, Chattanooga, TN (M.M.); MedPharmics, Metairie, LA (R.J.J.); and Black Hills Center for American Indian Health, Rapid City, SD (J.A.H.).

Background: NVX-CoV2373 is an adjuvanted, recombinant spike protein nanoparticle vaccine that was shown to have clinical efficacy for the prevention of coronavirus disease 2019 (Covid-19) in phase 2b-3 trials in the United Kingdom and South Africa, but its efficacy had not yet been tested in North America.

Methods: We conducted a phase 3, randomized, observer-blinded, placebo-controlled trial in the United States and Mexico during the first half of 2021 to evaluate the efficacy and safety of NVX-CoV2373 in adults (≥18 years of age) who had not had severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Participants were randomly assigned in a 2:1 ratio to receive two doses of NVX-CoV2373 or placebo 21 days apart. Read More

View Article and Full-Text PDF
February 2022

Antibody responses of healthy adults to the p27 peptide of respiratory syncytial virus fusion protein.

Vaccine 2022 01 10;40(3):536-543. Epub 2021 Dec 10.

Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, USA; Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA. Electronic address:

The respiratory syncytial virus (RSV) fusion (F) protein undergoes two furin-cleavage events to become fusion competent, resulting in the release of a twenty-seven amino acid peptide (p27). Recent studies indicate that the p27 region of the F protein was an immunodominant antigen in young children. In this study, we evaluated the kinetics of the serum antibody response to the p27 peptide following natural RSV reinfection in adults. Read More

View Article and Full-Text PDF
January 2022

Laparoscopic cholecystectomy: Histopathological analysis of metabolic associated fatty liver disease and fibrosis.

Ann Hepatol 2022 Mar-Apr;27(2):100651. Epub 2021 Dec 9.

Traslational Research Unit, Medica Sur Clinic & Foundation, Puente de Piedra 150, Toriello Guerra. Tlalpan, 14050 Mexico City, Mexico. Electronic address:

Introduction: Metabolic (dysfunction) associated fatty liver disease (MAFLD) and cholelithiasis are highly prevalent and are associated with common risk factors such as obesity, hypertriglyceridemia, and fasting glucose levels; however, it is not clear whether cholelithiasis is associated with MAFLD or fibrosis.

Objective: To determine MAFLD severity and associated risk factors in patients diagnosed with cholelithiasis.

Materials And Methods: Observational, cross-sectional and prolective study (from October 2018 to March 2020) of patients undergoing elective laparoscopic cholecystectomy with liver biopsy, excluding other causes of hepatic disease or significant alcohol consumption. Read More

View Article and Full-Text PDF

Novel and extendable genotyping system for human respiratory syncytial virus based on whole-genome sequence analysis.

Influenza Other Respir Viruses 2022 05 10;16(3):492-500. Epub 2021 Dec 10.

Center for Ecology of Infectious Diseases, Institute of Bioinformatics, University of Georgia, Athens, GA, USA.

Background: Human respiratory syncytial virus (RSV) is one of the leading causes of respiratory infections, especially in infants and young children. Previous RSV sequencing studies have primarily focused on partial sequencing of G gene (200-300 nucleotides) for genotype characterization or diagnostics. However, the genotype assignment with G gene has not recapitulated the phylogenetic signal of other genes, and there is no consensus on RSV genotype definition. Read More

View Article and Full-Text PDF

Does admission acetylsalicylic acid uptake in hospitalized COVID-19 patients have a protective role? Data from the Spanish SEMI-COVID-19 Registry.

Intern Emerg Med 2022 04 29;17(3):761-775. Epub 2021 Nov 29.

Internal Medicine Department, Miguel Hernandez University of Elche, Alicante, Spain.

Acetylsalicylic acid (ASA) is widely used in the treatment and prevention of cardiovascular disorders. Our objective is to evaluate its possible protective role, not only in mortality but also in other aspects such as inflammation, symptomatic thrombosis, and intensive care unit (ICU) admission in hospitalized COVID-19 patients. We realized an observational retrospective cohort study of 20,641 patients with COVID-19 pneumonia collected and followed-up from Mar 1st, 2020 to May 1st, 2021, from the nationwide Spanish SEMI-COVID-19 Registry. Read More

View Article and Full-Text PDF

[Interprofessional team training with in situ simulation to improve the quality of cardiopulmonary resuscitation].

J Healthc Qual Res 2022 Mar-Apr;37(2):92-99. Epub 2021 Nov 22.

Hospital virtual Valdecilla, Santander, España.

Introduction: In situ simulation facilitates training in clinical settings under similar emotional pressure that occurs in real life situations. The objective of the present study was to assess the feasibility, implementation, facilitators self-confidence and teaching challenges of a training program of cardiopulmonary resuscitation through an in situ simulation plan.

Method: A training program was designed for the facilitators. Read More

View Article and Full-Text PDF

First Record of Natural Transovarial Transmission of Dengue Virus in Aedes albopictus from Cuba.

Am J Trop Med Hyg 2021 11 8;106(2):582-584. Epub 2021 Nov 8.

Vector Control Department, Institute of Tropical Medicine "Pedro Kourí," Havana, Cuba.

Transovarial transmission (TOT) of dengue virus (DENV) in Aedes spp. is an important mechanism for DENV maintenance in nature and may be important in initiating outbreaks. The objective of this study was to explore the occurrence of TOT in wild Aedes albopictus populations in Cuba. Read More

View Article and Full-Text PDF
November 2021

The color of greater flamingo feathers fades when no cosmetics are applied.

Ecol Evol 2021 Oct 23;11(20):13773-13779. Epub 2021 Sep 23.

Departamento de Ecología de Humedales Estación Biológica de Doñana, C.S.I.C. Sevilla Spain.

Greater flamingos use cosmetic coloration by spreading uropygial secretions pigmented with carotenoids over their feathers, which makes the plumage redder. Because flamingos inhabit open environments that receive direct solar radiation during daytime, and carotenoids bleach when exposed to solar radiation, we expected that the plumage color would fade if there is no maintenance for cosmetic purposes. Here, we show that the concentrations of pigments inside feathers and on the surface of feathers were correlated, as well as that there was a correlation between the concentrations of pigments in the uropygial secretions and on the surface of feathers. Read More

View Article and Full-Text PDF
October 2021

Arthroscopic resection as a rapid recovery treatment for Os acetabuli in soccer players who had undergone hip arthroscopy: a case series with 1-year follow-up.

Arch Orthop Trauma Surg 2021 Oct 26. Epub 2021 Oct 26.

Instituto Cugat. Hospital Quironsalud Barcelona, Instituto de Traumatología, Plaça d'Alfonso Comín, 5, 08023, Barcelona, Spain.

Introduction: Os acetabuli (OSA) is defined as a radiopaque structure located around the acetabular rim highly related to Femoroacetabular Impingement (FAI). Its treatment depends on the perspective of post-surgical joint instability. Ossicle resection is recommended if the femoral head is covered enough by the labrum. Read More

View Article and Full-Text PDF
October 2021

Serum IgG anti-SARS-CoV-2 Binding Antibody Level Is Strongly Associated With IgA and Functional Antibody Levels in Adults Infected With SARS-CoV-2.

Front Immunol 2021 8;12:693462. Epub 2021 Oct 8.

Department of Molecular Virology & Microbiology, Baylor College of Medicine, Houston, TX, United States.

Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in December 2019 in Wuhan, China, and then rapidly spread causing an unprecedented pandemic. A robust serological assay is needed to evaluate vaccine candidates and better understand the epidemiology of coronavirus disease (COVID-19).

Methods: We used the full-length spike (S) protein of SARS-CoV-2 for the development of qualitative and quantitative IgG and IgA anti-S enzyme linked immunosorbent assays (ELISA). Read More

View Article and Full-Text PDF
November 2021

Deformation understanding in the Upper Paleozoic of Ventana Ranges at Southwest Gondwana Boundary.

Sci Rep 2021 10 21;11(1):20804. Epub 2021 Oct 21.

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Laboratorio de Paleomagnetismo "Daniel A. Valencio", Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Buenos Aires, Argentina.

At the east of the Ventana Ranges, Buenos Aires, Argentina, outcrops the Carboniferous-Permian Pillahuincó Group (Sauce Grande, Piedra Azul, Bonete and Tunas Formation). We carried out an Anisotropy of Magnetic Susceptibility (AMS) study on Sauce Grande, Piedra Azul and Bonete Formation that displays ellipsoids with constant K axes trending NW-SE, parallel to the fold axes. The K axes are orientated in the NE-SW quadrants, oscillating from horizontal (base of the sequence-western) to vertical (top of the sequence-eastern) positions, showing a change from tectonic to almost sedimentary fabric. Read More

View Article and Full-Text PDF
October 2021

Innovation in Aircraft Cabin Interior Panels. Part II: Technical Assessment on Replacing Glass Fiber with Thermoplastic Polymers and Panels Fabricated Using Vacuum Forming Process.

Polymers (Basel) 2021 Sep 24;13(19). Epub 2021 Sep 24.

National Council for Science and Technology, Center for Engineering and Industrial Development (CONACYT-CIDESI), Carretera Estatal 200, km 23, Querétaro 76265, Mexico.

The manufacturing process of the aircraft cabin interior panels is expensive and time-consuming, and the resulting panel requires rework due to damages that occurred during their fabrication. The aircraft interior panels must meet structural requirements; hence sandwich composites of a honeycomb core covered with two layers of pre-impregnated fiberglass skin are used. Flat sandwich composites are transformed into panels with complex shapes or geometries using the compression molding process, leading to advanced manufacturing challenges. Read More

View Article and Full-Text PDF
September 2021

Innovation in Aircraft Cabin Interior Panels Part I: Technical Assessment on Replacing the Honeycomb with Structural Foams and Evaluation of Optimal Curing of Prepreg Fiberglass.

Polymers (Basel) 2021 Sep 22;13(19). Epub 2021 Sep 22.

Center for Engineering and Industrial Development (CIDESI), Carretera Estatal 200, km 23, Querétaro 76265, Mexico.

Sandwich composites are widely used in the manufacture of aircraft cabin interior panels for commercial aircraft, mainly due to the light weight of the composites and their high strength-to-weight ratio. Panels are used for floors, ceilings, kitchen walls, cabinets, seats, and cabin dividers. The honeycomb core of the panels is a very light structure that provides high rigidity, which is considerably increased with fiberglass face sheets. Read More

View Article and Full-Text PDF
September 2021