Mayorga-Vega D.,University of Granada |
Merino-Marban R.,University of Malaga |
Manzano-Lagunas J.,CEIP Virgen de Belen |
Blanco H.,University of Chihuahua |
Viciana J.,University of Granada
Journal of Sports Science and Medicine | Year: 2016
The main purpose of the present study was to examine the effects of a physical education-based stretching development and maintenance program on hamstring extensibility in schoolchildren. A sample of 150 schoolchildren aged 7-10 years old from a primary school participated in the present study (140 participants were finally included). The six classes balanced by grade were cluster randomly assigned to the experimental group 1 (n = 51), experimental group 2 (n = 51) or control group (n = 49) (i.e., a cluster randomized controlled trial design was used). During the physical education classes, the students from the experimental groups 1 and 2 performed a four-minute stretching program twice a week for nine weeks (first semester). Then, after a five-week period of detraining coinciding with the Christmas holidays, the students from the experimental groups 1 and 2 completed another stretching program twice a week for eleven weeks (second semester). The students from the experimental group 1 continued performing the stretching program for four minutes while those from the experimental group 2 completed a flexibility maintenance program for only one minute. The results of the two-way analysis of variance showed that the physical education-based stretching development program significantly improved the students’ hamstring extensibility (p < 0.001), as well as that these gains obtained remained after the stretching maintenance program (p < 0.001). Additionally, statistically significant differences between the two experimental groups were not found (p > 0.05). After a short-term stretching development program, a physical education-based stretching maintenance program of only one-minute sessions twice a week is effective in maintaining hamstring extensibility among schoolchildren. This knowledge could help and guide teachers to design programs that allow a feasible and effective development and maintenance of students’ flexibility in the physical education setting. © Journal of Sports Science and Medicine.
Marquez J.,University of Chihuahua |
Jauregui D.V.,New Mexico State University |
Weldon B.D.,New Mexico State University |
Newtson C.M.,New Mexico State University
Practice Periodical on Structural Design and Construction | Year: 2016
The latest bridge design manual from the Precast/Prestressed Concrete Institute (PCI) provides preliminary design charts for selecting the girder size and prestressing strands for a given span length and beam spacing but only for fc′ = 55 MPa and 0.6-in. (15-mm) diameter strands. This single concrete strength and strand size may limit the use of the charts, particularly in states considering high- and ultrahigh-performance concrete. Accordingly, this paper presents a simplified procedure to develop preliminary design charts for prestressed concrete bulb-tee girders based on the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) bridge design specifications considering service load stress limits and flexural strength. The procedure is demonstrated for a BT-72 section and new LRFD charts are generated to compare the effects of higher concrete strength and larger strand size on bridge girder design. The benefits and limitations of the approach and recommendations for future implementation are discussed. © 2015 American Society of Civil Engineers.
Olague I.,Autonomous University of Chihuahua |
Olague I.,New Mexico State University |
Leslie I.H.,New Mexico State University |
Burton T.D.,New Mexico State University |
And 2 more authors.
ASEE Annual Conference and Exposition, Conference Proceedings | Year: 2012
This paper details the establishing, articulation, and progress of a pioneering strategic partnership directed to offer a dual degree program in the field of Aerospace Engineering. The universities leading this initiative are New Mexico State University (NMSU) and the Universidad Autónoma de Chihuahua (UACH), which are located in the border states of New Mexico, USA, and Chihuahua, Mexico. The trust-based nature of this collaboration is anchored in a long tradition of academic and cultural collaboration between these institutions. The ultimate goal of the program is to set a model for international academic collaboration where student mobility, curriculum exchange, and transferring of credits are no longer a challenge but a reality. In this paper, the authors include a brief description of the partner institutions, including mission, history, size, resources and distinctive characteristics, as well as academic program structure, operating principles and administrative procedures that are guiding this partnership. Additionally, this paper documents the student's selection process and the enrollment requirements, as well as challenges faced by students, such as language barriers, uneven academic preparedness, cultural shock and adaptation, housing, timing of student visa requesting process, and financial constraints and difficulties. The complete program requires 203 credit hours, 163 from UACH and 33-40 credit hours from NMSU. The first cohort of students started at UACH in the fall of 2007 and is currently enrolled at NMSU with expected graduation date of December 2011. Since Fall 2007, every semester an average of 20 students has been transferred from UACH to NMSU as part of this program. Despite the fact that the Dual Aerospace Engineering program was originally designed to help Mexican students to attain a college degree in the US, it has the potential to benefit students from the US. It is expected than in a short future, US students will be motivated to start their college career at UACH in Mexico with the subsequent advantage of cost education reduction and an international experience that constitutes an asset in their professional development. As it was agreed in the Memorandum of Understanding (MOU), this agreement has been reviewed and modified by mutual consent when required to ensure the optimum level of performance. This paper documents the significance and impact of the present academic collaboration on the engineering communities of both countries. © 2012 American Society for Engineering Education.
Gentile A.,Italian Agricultural Research Council |
Jaquez Gutierrez M.,University of Chihuahua |
Martinez J.,University of Chihuahua |
Frattarelli A.,Italian Agricultural Research Council |
And 2 more authors.
Plant Cell, Tissue and Organ Culture | Year: 2014
The effect of meta-Topolin (mT), an aromatic natural cytokinin, on micropropagation and adventitious shoot regeneration was evaluated on Prunus rootstocks, Torinel (Prunus domestica L.) and Ferdor (Prunus insititia × domestica). In vitro shoots were grown for three subcultures on a multiplication medium containing 2.1, 4.2 or 6.3 μM of mT or 2.1 μM N 6-benzyladenine (BA). Then, apical leaves were excised and transferred on a medium supplied with BA, thidiazuron (TDZ) or zeatin for adventitious regeneration. Shoots multiplied on 2.1 μM mT or BA, were also induced to root with α-naphthalene acetic acid and acclimatized. meta-Topolin did not improve shoot proliferation, respect to BA, however, positively influences growth and quality of shoots. Ferdor from mT showed higher rooting percentage (92 %), root number and length, respect to the control, while a similar response was observed in Torinel with both cytokinins. Acclimatisation was higher than 90 % for both genotypes and, after 5 months, the highest length of roots was found in plants from mT. Adventitious regeneration was obtained only in leaves from shoots previously grown on mT. The highest regeneration responses, 65 and 42 %, respectively for Ferdor and Torinel, were obtained in the regeneration medium supplied with TDZ. © 2014 Springer Science+Business Media Dordrecht.
Bologna-Molina R.,Mexico State University |
Mosqueda-Taylor A.,Metropolitan Autonomous University |
De Almeida-Oslei P.,University of Campinas |
Toral-Rizo V.,University of Campinas |
Martinez-Mata G.,University of Chihuahua
Medicina Oral, Patologia Oral y Cirugia Bucal | Year: 2010
In this study we present a rare case of peripheral desmoplastic ameloblastoma and discuss its clinical features, histopathology, and inmunoshistochemical profile. This article reports a new case of this unusual neoplasm in a 66 year-old woman in which the main complaint was an asymptomatic swelling located in the right body of mandible. Histopathological findings were similar to the two previously reported cases of this tumor. Positive immunohistochemical stain for laminin V and type IV collagen suggests an inductive effect of the epithelium over the stroma while the low index of p53 protein and Ki-67 expression in epithelium and stromal cells, as well as CD138 uniform positive-stain in epithelial cells, support the benign biological behavior of this lesion. Including this new case, currently there are only three reports of this rare neoplasm. Reports of new cases of peripheral desmoplastic ameloblastoma are necessary for a better understanding of the origin and behavior of this particular subtype of ameloblastoma. © Medicina Oral S. L.
Anchondo T.J.R.,Italian Agricultural Research Council |
Frattarelli A.,Italian Agricultural Research Council |
Monticelli S.,Italian Agricultural Research Council |
Martinez J.,University of Chihuahua |
Caboni E.,Italian Agricultural Research Council
Acta Horticulturae | Year: 2011
Micro-shoots, originated from axillary buds, were maintained for 1, 3 or 6 subcultures (15 days each) in a medium (MS microsalts and organics and QL macrosalts) solidified with washed purified agar (Sigma, A 8678), 5.2 or 4.2 g/L, or agar, 3.2 g/L plus pectines (M-GEL, Switzerland), 8.2 g/L. Significant differences were not detected among the treatments after one sub-culture, but after 3 sub-cultures 4.2 g/L agar induced greater shoot proliferation either than the highest concentration of agar or the combination of agar with pectins. The gelling agent also affected shoot quality: some of the new-formed shoots grown on agar+pectin solidified medium showed a hyperhydric aspect and some chlorotical leaves. Higher water and lower chlorophyll (both a and b) contents were found in those shoots respect to those grown on only agar as gelling agent. Micro-shoots were induced to root in a medium supplied with 2.5 μM IBA and solidified with 4.2 g/L agar with or without vermiculite and subsequently acclimatised. The rooting percentage was not significantly affected by the presence of vermiculite in the in vitro rooting medium, but root formation was delayed. Micro-shoots induced to root on agar without vermiculite had only a slight lower acclimatisation response.
Lugo-Baruqui A.,Institute of Molecular Biology in Medicine |
Munoz-Valle J.F.,Institute of Investigation in Rheumatology and Skeletal Muscle IIRSME |
Arevalo-Gallegos S.,University of Chihuahua |
Armendariz-Borunda J.,Institute of Molecular Biology in Medicine |
Armendariz-Borunda J.,OPD Civil Hospital of Guadalajara
Hepatology Research | Year: 2010
Angiotensin II (AT-II) is a peptide that plays an important role in the renin-angiotensin-aldosterone (RAA) system. Traditionally, the RAA system has been related with states of systemic hypertension and hypoperfusion as a counterbalance mechanism. Recently, AT-II has been studied for its properties in the process of fibrosis in several organs, especially in the liver. AT-II is capable to stimulate the activated hepatic stellate cells, which increase expression of profibrogenic molecules like tumor growth factor-β, tissue inhibitor of metalloproteinase-1 and collagen I, among others. At the same time, AT-II is implied in the hemodynamic balance of cirrhosis and portal hypertension. Due to its profibrogenic and vasoactive properties, blockade of AT-II actions constitutes an important therapeutic target to inhibit fibrotic processes and reduction of risk of complications of portal hypertension as well. Some drugs like angiotensin-converting enzyme inhibitors or the angiotensin II receptor blockers have been studied as alternatives for the treatment of patients with cirrhosis with promising results. Nonetheless, additional research is required in order to consider these drugs as a part of the integral treatment of the patient with cirrhosis and portal hypertension. © 2009 The Japan Society of Hepatology.
PubMed | University of Chihuahua
Type: Journal Article | Journal: Meat science | Year: 2011
Groups of castrate male Criollo goats were slaughtered at 12, 16, 20 and 24 kg liveweights after being reared on natural rangeland with concentrate supplementation. After slaughter the carcasses were chilled for 24 h at 2C, and the total lean was dissected from the left halves of the carcasses. The total lean was subjected to a proximate analysis. M. biceps femoris and M. longissimus dorsi muscles were dissected out of the right halves of the carcasses. Various physical and chemical quality parameters, such as Warner-Bratzler shear values and tristimulus colour values, were measured on these muscles in addition to hydroxy proline analysis, for the estimation of collagen content. The moisture content of the total lean decreased steadily with increasing slaughter weight to a level of approximately 76% in the heaviest group. Ash and protein content tended to fall, with intramuscular fat increasing to approximately 16% of the wet tissue weight. The ultimate pH of the two muscles was high in all the slaughter groups, being usually higher than 60. Generally, shear values did not change between the slaughter groups in the two muscles. The data indicate that slaughtering castrate male Criollo goats at 24 kg instead of 8 kg does not exert deleterious effects on the parameters of physical and chemical quality investigated.