Biocomposites from Rice Straw Nanofibers: Morphology, Thermal and Mechanical Properties

Agricultural residues are major potential resources for biomass and for material production. In this work, rice straw residues were used to isolate cellulose nanofibers of different degree of oxidation. Firstly, bleached rice fibers were produced from the rice straw residues following chemical extraction and bleaching processes. Oxidation of rice fibers mediated by radical 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) at pH 10 was then applied to extract rice cellulose nanofibers, with diameters of 3-11 nm from morphological analysis. The strengthening capacity of rice nanofibers was tested by casting nanocomposite films with poly(vinyl alcohol) polymer. The same formulations with eucalyptus nanofibers were produced as comparison. Their thermal and mechanical performance was evaluated using thermogravimetry, differential scanning calorimetry, dynamic mechanical analysis and tensile testing. The glass transition of nanocomposites was shifted to higher temperatures with respect to the pure polymer by the addition of rice cellulose nanofibers. Rice nanofibers also acted as a nucleating agent for the polymer matrix. More flexible eucalyptus nanofibers did not show these two phenomena on the matrix. Instead, both types of nanofibers gave similar stiffening (as Young\u27s modulus) to the matrix reinforced up to 5 wt.%. The ultimate tensile strength of nanocomposite films revealed significant enhancing capacity for rice nanofibers, although this effect was somehow higher for eucalyptus nanofibers

Assessment of cognitive performance among Mexican children and adolescents afflicted by simple to complex congenital heart diseases. Preliminary study

Among patients afflicted by congenital heart diseases (CHD) diverse, and complex neurological alterations are commonly observed. These have neither been completely identified nor understood. With the aim of identifying specific neurocognitive alterations among children and adolescents afflicted by CHD we investigated the possible presence of cognitive disorders related to the presence of cardiovascular disease with the aid of a sample of 20 patients (12 teenagers and 8 school-age children). Taken altogether, 9 of them were afflicted by simple and 11 by complex pathologies (respectively, CHDs/c). The Neuropsychological Test for Memory and Attention (Neuropsi), standardized for Mexico by Ostrosky et al. (2004), was individually applied to all participants. The information of cognitive performance was obtained in relation to the categories attention and memory, and the same areas allowed us to assess global performance. CHDc subjects performed significantly poorer compared to CHDs in i) attention and executive function, ii) memory and iii) attention and memory. Likewise, among CHDc subjects a significantly higher proportion of cases were diagnosed as abnormal in the same variables. Also a significant and negative correlation was determined between CHD severity and neuropsychological scoring. Children and adolescents afflicted by CHD are at high risk of developing cognitive function alterations including aspects of memory, attention and executive functions, alterations which are likely to be worst among those cases carrying CHDc conditions

Migración internacional y empoderamiento de la mujer

Este trabajo analiza como las esposas de migrantes adquieren poder cuando ellos emigran. Cuando ellas se quedan adquieren más responsabilidades, pero también toman decisiones, ingresan al mercado laboral, aprenden a controlar los recursos del hogar. Al retorno del marido, pueden mantener ese poder, cederlo o afrontar fricciones, violencia doméstica, convivencia más equilibrada en el hogar dependiendo si ellos aceptan los nuevos roles de ellas. Para verificar lo que ocurre, se realizaron diez entrevistas con esposas de migrantes en la zona de Toluca, estado de México. Los resultados exhiben cuatro tipos de poder: mujeres que adquieren un mínimo poder en ausencia del esposo, mujeres que adquieren poder sólo en ausencia del marido, mujeres que se empoderan en ausencia y lo mantienen al retorno, y mujeres que siempre han tenido poder al interior del hogarConacy

Factores familiares relacionados al acoso escolar: una revisión sistemática

Los factores familiares relacionados al acoso escolar, pasan inadvertidos en cualquier investigación, ya que, al realizar un estudio, este pude ser muy general o el lector solo presta atención a los datos estadísticos planteados; es por ello que se llega a proponer una tesis de revisión sistemática, que tiene como objetivo describir las características metodológicas, y determinar los factores familiares relacionado al coso escolar de dichos artículos empíricos publicados en science direct y scielo en los últimos 10 años. para cumplir dicho objetivo se tuvo en cuenta dos bases de datos, de las cuales se encontraron 339, resultando elegidas minuciosamente 8 artículos. de estos artículos se obtuvo tres factores familiares más relevantes relacionado al acoso escolar: clima familiar, comunicación y prácticas de crianza

Examinig the mediating role of coping and emotion regularion in stress models in adolescents

The aim of this research was to analyze the relationship between stressful events, coping, and emotion regulation in adolescents from marginalized settings. A cross-sectional study was conducted with 523 adolescents aged 13 to 15 years. The Global Scale of Perceived Stress for Adolescents, the Coping Scale for Adolescents, and the Multidimensional Scale of Emotion Regulation for Adolescents, were used. Several mediation models were tested considering whether coping mediated the relationship between stressful events and emotion regulation responses, or, on contrary, emotion regulation assumes a mediating role between stressful events and coping. Data indicate significant direct and indirect effects in all models, with the highest explained variance in the models which included emotion regulation as a mediating variable. Results are discussed considering the role of coping and emotion regulation as mediating variables, and their relationship with diverse stressful events. In this research, emotion regulation strategies lead to adolescent coping

Influence of age, gender and obesity on pressure discomfort threshold of the foot: A cross-sectional study

[EN] Background: Foot pain is a highly prevalent health problem for which measures such as a pattern of Pressure Discomfort Threshold of the foot plantar surface can provide valuable information for orthosis design. This study aimed to describe such pattern as a tool for the assessment of painful conditions of the feet and to analyse how it modifies according to age, gender and obesity. Methods: A cross-sectional study was performed with participants allocated in: Group 1 people aged 20 to 35 years, Group 2 aged 50 to 65 years and Group 3 aged over 65. Pressure Discomfort Threshold on twelve points of the foot plantar surface was measured with an adapted manual dynamometer. Inferential analyses of the data were performed using one-way analysis of variance (ANOVA) considering foot areas, age group, gender and obesity. Findings: 36 participants were analysed. The pattern of Pressure Discomfort Threshold for all individuals showed a significantly higher threshold on the heel and external foot (P < 0.001, eta(2) = 0.124) and was statistical significantly influenced by age (P < 0.001, eta(2) = 0.17), especially in participants aged over 65; by gender, with women having higher values (P < 0.001, eta(2) = 0.13), and by obesity (P < 0.001, eta(2) = 0.19). Interpretation: A Pressure Discomfort Threshold pattern exists in the foot plantar surface. The characteristics of the discomfort pattern of the foot and its association with aging, gender and obesity may have considerable implications for orthosis and footwear design.Dueñas, L.; Arnal-Gómez, A.; Aparicio, I.; Balasch-Bernat, M.; López-Bueno, L.; Gonzalez Garcia, JC.; Solves Camallonga, C.... (2021). Influence of age, gender and obesity on pressure discomfort threshold of the foot: A cross-sectional study. Clinical Biomechanics. 82(105252):1-7. https://doi.org/10.1016/j.clinbiomech.2020.105252S1782105252AKDEMIR, O., BILKAY, U., TIFTIKCIOGLU, Y. O., OZEK, C., YAN, H., ZHANG, F., & AKIN, Y. (2010). New alternative in treatment of callus. The Journal of Dermatology, 38(2), 146-150. doi:10.1111/j.1346-8138.2010.00978.xAnguera, J. A., & Gazzaley, A. (2012). Dissociation of motor and sensory inhibition processes in normal aging. Clinical Neurophysiology, 123(4), 730-740. doi:10.1016/j.clinph.2011.08.024Awale, A., Dufour, A. B., Katz, P., Menz, H. B., & Hannan, M. T. (2016). Link Between Foot Pain Severity and Prevalence of Depressive Symptoms. Arthritis Care & Research, 68(6), 871-876. doi:10.1002/acr.22779Bacarin, T. A., Sacco, I. C. N., & Hennig, E. M. (2009). Plantar pressure distribution patterns during gait in diabetic neuropathy patients with a history of foot ulcers. Clinics, 64(2). doi:10.1590/s1807-59322009000200008Barlow, A., Braid, S., & Jayson, M. (1990). 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Plantar pressure measurements and the prevention of ulceration in the diabetic foot. The Journal of Bone and Joint Surgery. British volume, 67-B(1), 79-85. doi:10.1302/0301-620x.67b1.3968150Dufour, A. B., Broe, K. E., Nguyen, U.-S. D. T., Gagnon, D. R., Hillstrom, H. J., Walker, A. H., … Hannan, M. T. (2009). Foot pain: Is current or past shoewear a factor? Arthritis & Rheumatism, 61(10), 1352-1358. doi:10.1002/art.24733Von Elm, E., Altman, D. G., Egger, M., Pocock, S. J., Gøtzsche, P. C., & Vandenbroucke, J. P. (2008). The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement: guidelines for reporting observational studies. Journal of Clinical Epidemiology, 61(4), 344-349. doi:10.1016/j.jclinepi.2007.11.008Fillingim, R. B. (2000). Sex, gender, and pain: Women and men really are different. Current Review of Pain, 4(1), 24-30. doi:10.1007/s11916-000-0006-6Gonzalez JC, García AC, Vivas MJ, Ferrús E, Alcántara E, Forner A. A new portable method for the measurement of pressure discomfort threshold on the foot plant. Fourth symposium of the Technical Group on Footwear Biomechanics. 5–7 August 1999. Canmore, Canada. International Society of Biomechanics.Gorter, K., Kuyvenhoven, M., & de Melker, R. (2000). Nontraumatic foot complaints in older people. A population-based survey of risk factors, mobility, and well-being. Journal of the American Podiatric Medical Association, 90(8), 397-402. doi:10.7547/87507315-90-8-397Greenspan, J. D., Craft, R. M., LeResche, L., Arendt-Nielsen, L., Berkley, K. J., Fillingim, R. B., … Traub, R. J. (2007). Studying sex and gender differences in pain and analgesia: A consensus report. Pain, 132(Supplement 1), S26-S45. doi:10.1016/j.pain.2007.10.014Hennig, E. M., & Sterzing, T. (2009). Sensitivity Mapping of the Human Foot: Thresholds at 30 Skin Locations. Foot & Ankle International, 30(10), 986-991. doi:10.3113/fai.2009.0986Hill, C. L., Gill, T. K., Menz, H. B., & Taylor, A. W. (2008). Prevalence and correlates of foot pain in a population-based study: the North West Adelaide health study. Journal of Foot and Ankle Research, 1(1). doi:10.1186/1757-1146-1-2Hills, A., Hennig, E., McDonald, M., & Bar-Or, O. (2001). Plantar pressure differences between obese and non-obese adults: a biomechanical analysis. International Journal of Obesity, 25(11), 1674-1679. doi:10.1038/sj.ijo.0801785Hong, W.-H., Lee, Y.-H., Chen, H.-C., Pei, Y.-C., & Wu, C.-Y. (2005). Influence of Heel Height and Shoe Insert on Comfort Perception and Biomechanical Performance of Young Female Adults During Walking. Foot & Ankle International, 26(12), 1042-1048. doi:10.1177/107110070502601208Le Johansson, L., Kjellberg, A., Kilbom, A., & Hagg, G. M. (1999). Perception of surface pressure applied to the hand. Ergonomics, 42(10), 1274-1282. doi:10.1080/001401399184947Kwan, R. L.-C., Zheng, Y.-P., & Cheing, G. L.-Y. (2010). The effect of aging on the biomechanical properties of plantar soft tissues. Clinical Biomechanics, 25(6), 601-605. doi:10.1016/j.clinbiomech.2010.04.003Machado, Á. S., Bombach, G. D., Duysens, J., & Carpes, F. P. (2016). Differences in foot sensitivity and plantar pressure between young adults and elderly. Archives of Gerontology and Geriatrics, 63, 67-71. doi:10.1016/j.archger.2015.11.005McPoil, T. G., & Cornwall, M. W. (2006). Plantar tactile sensory thresholds in healthy men and women. The Foot, 16(4), 192-197. doi:10.1016/j.foot.2006.07.001Messing, K., & Kilbom, Å. (2001). Standing and very slow walking: foot pain-pressure threshold, subjective pain experience and work activity. Applied Ergonomics, 32(1), 81-90. doi:10.1016/s0003-6870(00)00030-2Mickle, K. J., & Steele, J. R. (2015). Obese older adults suffer foot pain and foot-related functional limitation. Gait & Posture, 42(4), 442-447. doi:10.1016/j.gaitpost.2015.07.013Mickle, K. J., Munro, B. J., Lord, S. R., Menz, H. B., & Steele, J. R. (2010). Foot Pain, Plantar Pressures, and Falls in Older People: A Prospective Study. Journal of the American Geriatrics Society, 58(10), 1936-1940. doi:10.1111/j.1532-5415.2010.03061.xOkifuji, A., Bradshaw, D. H., & Olson, C. (2009). Evaluating obesity in fibromyalgia: neuroendocrine biomarkers, symptoms, and functions. Clinical Rheumatology, 28(4), 475-478. doi:10.1007/s10067-009-1094-2Redmond, A. C., Landorf, K. B., & Keenan, A.-M. (2009). Contoured, prefabricated foot orthoses demonstrate comparable mechanical properties to contoured, customised foot orthoses: a plantar pressure study. Journal of Foot and Ankle Research, 2(1). doi:10.1186/1757-1146-2-20Shrout, P. E., & Fleiss, J. L. (1979). Intraclass correlations: Uses in assessing rater reliability. Psychological Bulletin, 86(2), 420-428. doi:10.1037/0033-2909.86.2.420Veves, A., Murray, H. J., Young, M. J., & Boulton, A. J. M. (1992). The risk of foot ulceration in diabetic patients with high foot pressure: a prospective study. Diabetologia, 35(7), 660-663. doi:10.1007/bf00400259Weerasinghe, T. W., Goonetilleke, R. S., & Reischl, U. (2016). Pressure thresholds and stiffness on the plantar surface of the human foot. Ergonomics, 60(7), 985-996. doi:10.1080/00140139.2016.1229042Xiong, S., Goonetilleke, R. S., Witana, C. P., & Rodrigo, W. D. A. S. (2010). An indentation apparatus for evaluating discomfort and pain thresholds in conjunction with mechanical properties of foot tissue in vivo. The Journal of Rehabilitation Research and Development, 47(7), 629. doi:10.1682/jrrd.2009.09.0152Xiong, S., Goonetilleke, R. S., & Jiang, Z. (2011). Pressure thresholds of the human foot: measurement reliability and effects of stimulus characteristics. Ergonomics, 54(3), 282-293. doi:10.1080/00140139.2011.552736Xu, R., Wang, Z., Ma, T., Ren, Z., & Jin, H. (2019). Effect of 3D Printing Individualized Ankle-Foot Orthosis on Plantar Biomechanics and Pain in Patients with Plantar Fasciitis: A Randomized Controlled Trial. Medical Science Monitor, 25, 1392-1400. doi:10.12659/msm.915045Van der Zwaard, B. C., Elders, P. J., Knol, D. L., Gorter, K. J., Peeraer, L., van der Windt, D. A., & van der Horst, H. E. (2011). Treatment of forefoot problems in older people: study protocol for a randomised clinical trial comparing podiatric treatment to standardised shoe advice. Journal of Foot and Ankle Research, 4(1). doi:10.1186/1757-1146-4-1

Migración internacional, territorios y sujetos migrantes del Estado de México (pdf)

Compilación sobre migración mexiquense a los Estado Unidos, origen rural y urbano, genero, complejidad del proceso y condiciones laborales.La migración internacional se ha incrementado en términos absolutos, esto quizá no resulta sorprendente, sin embargo, llama la atención que las migraciones modernas aumentaran en climas sociales tan hostiles. Hasta la Primera Guerra Mundial las inmigraciones masivas ocurrieron “sin restricciones” (visas, cuotas o barreras de seguridad); después de la Segunda Guerra Mundial esto cambió y, donde antes predominaban las acciones de reclutamiento y bienvenida a los recién llegados, ahora reinan el control y la restricción. En la actualidad, los países receptores mantienen posturas restrictivas y selectivas de la fuerza de trabajo que conviene “dejar” entrar a su territorio. Hay una generalización de políticas de control de flujos, restricciones sistemáticas a entradas y permanencias, de hecho para muchos gobiernos, este control se erige como preocupación preeminente.UAE

Somatic PDGFRB activating variants in fusiform cerebral aneurysms

The role of somatic genetic variants in the pathogenesis of intracranial-aneurysm formation is unknown. We identified a 23-year-old man with progressive, right-sided intracranial aneurysms, ipsilateral to an impressive cutaneous phenotype. The index individual underwent a series of genetic evaluations for known connective-tissue disorders, but the evaluations were unrevealing. Paired-sample exome sequencing between blood and fibroblasts derived from the diseased areas detected a single novel variant predicted to cause a p.Tyr562Cys (g.149505130T>C [GRCh37/hg19]; c.1685A>G) change within the platelet-derived growth factor receptor β gene (PDGFRB), a juxtamembrane-coding region. Variant-allele fractions ranged from 18.75% to 53.33% within histologically abnormal tissue, suggesting post-zygotic or somatic mosaicism. In an independent cohort of aneurysm specimens, we detected somatic-activating PDGFRB variants in the juxtamembrane domain or the kinase activation loop in 4/6 fusiform aneurysms (and 0/38 saccular aneurysms; Fisher's exact test, p < 0.001). PDGFRB-variant, but not wild-type, patient cells were found to have overactive auto-phosphorylation with downstream activation of ERK, SRC, and AKT. The expression of discovered variants demonstrated non-ligand-dependent auto-phosphorylation, responsive to the kinase inhibitor sunitinib. Somatic gain-of-function variants in PDGFRB are a novel mechanism in the pathophysiology of fusiform cerebral aneurysms and suggest a potential role for targeted therapy with kinase inhibitors

Oseltamivir-Resistant Pandemic (H1N1) 2009 Virus, Mexico

During May 2009–April 2010, we analyzed 692 samples of pandemic (H1N1) 2009 virus from patients in Mexico. We detected the H275Y substitution of the neuraminidase gene in a specimen from an infant with pandemic (H1N1) 2009 who was treated with oseltamivir. This virus was susceptible to zanamivir and resistant to adamantanes and oseltamivir