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Rivera-Arzola P.N.,Polytechnical University of Pachuca | Ramos-Fernandez J.C.,Polytechnical University of Pachuca | Franco J.M.O.,Polytechnical University of Pachuca | Villanueva-Ibanez M.,Polytechnical University of Pachuca | Flores-Gonzalez M.A.,Polytechnical University of Pachuca
Proceedings - 2011 IEEE Electronics, Robotics and Automotive Mechanics Conference, CERMA 2011 | Year: 2011

The present work shows a PIC microcontroller embedded system that controls scanning trajectories of an ultrasound transducer to produce ultrasonic stimulation and thereby increasing bone density in patients with osteoporosis. This system is based on a microcontroller, stepper motors, a XY Cartesian manipulator, and an ultrasound transducer. © 2011 IEEE. Source

Cruz Ramirez M.G.,Polytechnical University of Pachuca | Rivera-Rios J.M.,Polytechnical University of Pachuca | Tellez-Jurado A.,Polytechnical University of Pachuca | Maqueda Galvez A.P.,Polytechnical University of Pachuca | And 2 more authors.
Journal of Environmental Management | Year: 2012

The State of Hidalgo (Mexico) has a large area of forests known as the Huasteca Hidalguense, with a large variety of microorganisms inhabiting it. They represent an important resource from the ecological and technological point of view because they can be used in a broad variety of industrial processes. Due to the climatic conditions of this region, fungi inhabiting it must be thermophile or, at least, thermotolerant, as temperatures can be higher than 45°C in the summer, declining to 20°C in the winter. Use of ligninolytic fungi relies on their capacity to produce enzymes of industrial interest, a topic that has been under continuous research by academic and industrial investigators. Among the most important enzymes are proteases that are widely used due to their biotechnological applications with a high economic impact. Other enzymes, laccases, peroxidases, and lipases are of interest for the industries of the state of Hidalgo, especially in the textile industry, specifically in effluent processing. Fungi (n= 156) were collected in the Huasteca Hidalguense, of which 100 were isolated in potato-dextrose-agar covered plates and maintained in tilted tubes. Afterwards, enzymatic activity (laccase, protease and lipase) was determined in the plates. The purpose was to select those fungi with the highest potential for biotechnological applications. Fungi generally grew at either 30°C or 37°C, and for some isolates enzymatic activities were detected at this higher temperature. Results are presented as the relation between enzymatic activity and growth rate: 60 fungi presented laccase activity, 49 had lipase activity, and none had protease activity. In most cases, enzymatic activity was higher than the growth rate, indicating that the isolated fungi have a great biotechnological potential. Statistical analysis revealed that isolates 31 (Trametes) and 8.1 (unidentified) have a larger potential to be studied as laccase-producing fungi. On the other hand, isolates 144.2 (Fomes), 154 (Trametes), and 147.2 (Pycnoporus) are of interest as lipase activity producers, an activity scarcely studied in this type of microorganisms. © 2010 Elsevier Ltd. Source

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