Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Instituto Interamericano de Estudios Jurídicos Internacionales, Instrumen­tos relativos a la Integración Económi­ca en América Latina, Washington, 1964.

J. E. Holloway; Apartheid. Un probléme- Une solution. Paris, Editions Genin, enero 1965. 81 pp.

Antonio Lomelí Garduño: Comentarios constitucionales. Universidad de Guana­juato, 1965. 143 pp.

Jean Meynaud y Alain Lancelot: Las actitudes políticas. Buenos Aires, Eudeba, 1965. 125 pp.

En estudios previos se ha demostrado que la endotoxemia inducida por lipopolisacárido (LPS) produce un desacoplamiento cardiorrespiratorio (CRP) debido a los efectos fisiológicos de la inflamación sistémica. Adicionalmente se sabe que la oxitocina tiene efectos antiinflamatorios y propiedades cardioprotectoras; sin embargo, se desconoce si ésta modifica el acoplamiento CRP. El objetivo del presente estudio fue comparar diferentes métodos matemáticos lineales y no lineales para la detección del desacoplamiento cardiorrespiratorio entre series de tiempo cardiacas y respiratorias. Se estudiaron series de tiempo R-R obtenidas de electrocardiogramas de grupos de roedores macho a los cuales se les administró solución salina o vehículo (V); lipopolisacárido (LPS); oxitocina (O) y LPS + oxitocina (LPS+Ox). Las series R-R y respiratorias derivadas del electrocardiograma (EDR) se analizaron en conjunto para cuantificar su grado de acoplamiento a través de las técnicas de correlación cruzada; entropía muestral cruzada; entropía condicional; información mutua; e información mutua de Rényi para los cuatro grupos. Se observó que la oxitocina no parece favorecer el acoplamiento CRP durante la endotoxemia inducida por LPS. Finalmente, se encontró que la entropía muestral cruzada y la entropía condicional presentaron las mayores diferencias estadísticas para identificar el desacoplamiento CRP producido por el LPS.

Older adults should perform physical activity to improve cardiorespiratory functions. Aerobic exercises improve cardiovascular function, decrease basal heart rate and blood pressure, and improve mood and energy. To facilitate the execution of aerobic physical activity in older adults, the objective of this research was to design an exercise device for older adults. Starting from design specifications such as comfort, size, weight, resistance, and cost, we developed the detailed design of a horizontal bicycle. The designed device, thanks to its horizontally disposed structure, its adequate resistance to pedaling, its dimensioning based on anthropometric measurements of the Chilean population, and the disposition of sensors for heart rate and oxygen saturation, is suitable for older adults. Its weight and size also make it convenient for use inside the home, and the use of materials, components, and manufacturing processes available nationally and within the cheapest options, increases the possibility of access by older adults.

Magnesium (Mg) is essential for the metabolic reactions of the human body and is known for its biocompatibility, its mechanical and physical properties are similar to human bone, which is why it is considered to have high potential in biomedical applications such as temporary and resorbable implants. Through surface modifications, the high tendency to corrosion of Mg could be controlled, such as biodegradable membranes that prevent the passage of chloride ions present in the human organism. To prepare the membrane, solutions of chitosan modified with gelatin and/or glutaraldehyde are used and by means of the electrospray method applied to protect the Mg. To simulate body fluid conditions a Kokubo saline solution (BFK) was prepared. The study focuses on evaluating the corrosion rate of Mg with a coating made of a chitosan electrosprayed membrane, applying electrochemical measurements of electrochemical impedance spectroscopy and linear polarization resistance. The key additive to improve the behavior of the membranes was observed with the use of gelatin, where the membrane with the best results lowing corrosion rates is the Mg CH+GE+GL system, which it was observed with very good physical integrity in the images of morphological analyzes of the surface after 30 days of exposure.

There is no specific age when the vault of the feet is completely formed. The objective of this study was to analyze the footprint morphology and obtain the Chippaux-Smirak Index in a Mexican population to identify the type of feet and its prevalence. A database of images of the soles of both feet was analyzed. The database contained images of 1,014 persons between 2 and 73 years old from Guanajuato state, Mexico. Moreover, a literature review was performed to identify the type of feet in the Mexican population. It was observed that less than 17 % of the population have cavus foot (p= 0.018). Furthermore, less than 25 % of the population between 17 and 73 years have flatfoot 3 (p= 0.0079) in the left foot. Also, only nine articles related to the type of foot in the Mexican population were found, but most of them were performed on young population. The formation of the medial arc could be beyond the first decade of life and the relatively high prevalence of flatfoot in adult life should be studied. Finally, the results found can be useful for orthopedists, physiotherapists, clinicians, and parents who are concerned about the foot health of their children.

E-book edition of the volume 43, number 3, year 2022, of the Revista Mexicana de Ingeniería Biomédica. In this issue: Vaginal Electrical Impedance Detects the Fertile Window in Healthy Women: a Pilot Study Segmentation of OCT and OCT-A Images using Convolutional Neural Networks Electrical Impedance Tomography to Measure Spirometry Parameters in Chronic Obstructive Pulmonary Disease Patients Book Review: “Medicine-Based Informatics and Engineering” Lecture Notes in Bioengineering, Springer, 2022 Detection of People Positive to COVID-19 through ATR-FTIR Spectra Analysis of Saliva using Machine Learning

La enfermedad de Alzheimer es una enfermedad neurodegenerativa que constituye la principal causa de demencia mundial. En esta revisión bibliográfica realizada en Google Académico, PubMed/Medline y SciELO con los descriptores: enfermedad de Alzheimer, microbiota intestinal, eje microbiota-intestino-cerebro, disbiosis intestinal, neuroinflamación y estrés oxidativo; se localizaron artículos en inglés y español, a texto completo. Aunque la patogenia de la enfermedad de Alzheimer no se conoce bien, se plantea la implicación de la alteración de la microbiota intestinal o disbiosis a través de mecanismos metabólicos, hormonales y neurales. Estos mecanismos que componen una compleja red de interrelaciones en el eje microbiota-intestino-cerebro representan una potencial diana terapéutica para la prevención y el tratamiento de la enfermedad. Dentro de las estrategias no farmacológicas se reconocen las dietas saludables ricas en vegetales, los probióticos, prebióticos y trasplante microbiano fecal. Las estrategias terapéuticas con medicamentos incluyen inhibidores de neurotransmisores, algunos antibióticos, GV-971 y ácidos grasos omega-3.Palabras clave: enfermedad de Alzheimer, microbiota intestinal, eje microbiota-intestino-cerebro, disbiosis intestinal, neuroinflamación, estrés oxidativo.