Nuevo León Research Articles

Ixodicidal effect of extracts from Cordia boissieri, Artemisia ludoviciana and Litchi chinensis on Rhipicephalus (Boophilus) microplus (Acari: Ixodidae).

The ixodicidal activity of the methanolic extracts of Artemisia ludoviciana (Astereceae), Cordia boissieri (Boraginaceae) and Litchi chinensis (Sapindaceae) against two field populations of Rhipicephalus (Boophilus) microplus from the state of Nuevo Leon (NL) and Veracruz (VER) was evaluated. The extract of L. chinensis in the concentration of 150 mg/ml showed efficacies of 100% and 99% against engorged females and mortalities of 98% and 99% against larvae. C. boissieri in the same concentration showed efficacies of 71% and 37% against engorged adults and mortalities of 33.04% and 10.33% against larvae and A. ludoviciana had efficacies of 94% and 83% in adults and mortalities of 89.39% and 89.21% against larvae in both populations respectively. The enzymatic activity of Acetylcholinesterase (AChE), Carboxylesterase (CaE), Glutathione-S-Transferase (GST) and Alkaline Phosphatase (ALP) was measured in both populations of ticks. As a result, a significant difference between both populations was shown, being the VER population the one that exhibited a higher enzymatic activity (p ≤ 0.05). It can be concluded that the methanolic extract of the seed of L. chinensis shows potential ixodicidal activity and can be used as an alternative source of tick control, however, prior characterization, toxicity and formulation studies are necessary.

Los efectos de la contaminación petrolera en el desarrollo de comunidades ejidales: el caso de la cuenca del Río San Juan (Nuevo León, Mexico)

Los efectos de la contaminación petrolera en el desarrollo de comunidades ejidales: el caso de la cuenca del Río San Juan (Nuevo León, Mexico)

EVALUACIÓN DEL CONTENIDO DE CARBONO EN BOSQUES DEL SUR DE NUEVO LEÓN


 
 
 El reconocimiento de la importancia de los servicios ambientales que proporcionan los bosques y la necesidad de contar con métodos confiables para su evaluación constituyen la justificación del presente trabajo, cuyos objetivos fueron desarrollar métodos e instrumentos prácticos para realizar estimaciones del contenido de carbono en bosques del sur del estado de Nuevo León. Se diseñaron ecuaciones de biomasa en función del diámetro normal de la forma para Pinus pseudostrobus, P. teocote y Quercus spp. en bosques templados del sur de Nuevo León. Además, se determinó el contenido de carbono de las especies objeto de estudio, mediante un analizador de carbono orgánico. Los resultados permitieron la construcción de tarifas y tablas de biomasa así como del contenido de carbono; a partir de ellos se evaluó el carbono en el componente arbóreo de bosques mixtos de pino-encino, encino-pino y rodales puros de pino. El porcentaje de carbono en los individuos de P. pseudostrobus fue 50.35, en P. teocote 47.78 y en Quercus spp. 48.43. Las tablas de contenido de carbono para rodales puros de pino se construyeron considerando diferentes índices de sitio. Las estimaciones del contenido de carbono fueron: pino-encino 45.24 Mg ha-1, encino-pino 64.20 Mg ha-1, de P. pseudostrobus 73.18 Mg ha-1 y de P. teocote 47.01 Mg ha-1.
 
 

Mandibular fracture incidence and patterns in hospital metropolitano “Dr. Bernardo sepulveda” SSNL (monterrey, nuevo leon, Mexico) a 4-year retrospective study and future outcomes

Mandibular fracture incidence and patterns in hospital metropolitano “Dr. Bernardo sepulveda” SSNL (monterrey, nuevo leon, Mexico) a 4-year retrospective study and future outcomes

Rapid assessment of avoidable blindness: Prevalence of blindness, visual impairment and diabetes in nuevo leon, Mexico 2014

ABSTRACTPurpose: To estimate the prevalence of blindness, visual impairment, diabetes mellitus, and diabetic retinopathy in patients aged 50 years and older in the State of Nuevo León, Mexico.Methods: Ninety-one clusters of 60 people aged 50+ were selected randomly and a rapid assessment of avoidable blindness (RAAB) was conducted. Participants had their visual acuity and cause of visual impairment assessed, underwent a random glucose test and fundoscopy under mydriasis if they had diabetes. The diabetic retinopathy (DR) degree was classified according to the Scottish diabetic retinopathy grading scheme.Results: From the sample 5,055 (92.6%) people were examined. The blindness prevalence was 1.7% (95% Confidence Interval: 1.3–2.1%). Cataract (32.6%), DR (29.1%) and glaucoma (16.3%) were the leading causes of blindness. The prevalence of severe, moderate, and early visual impairment was 1.0%, 5.1%, and 7.7%, respectively. Among respondents, 31% had diabetes and 8.1% of them was not diagnosed prior to the study. Of all participants with diabetes, 50% had glucose levels of 200 mg/dl or higher and 15.7% had sight-threatening diabetic retinopathy.Conclusions: Besides strengthening of cataract intervention activities, more ophthalmic services for diabetic retinopathy and glaucoma control are needed in Nuevo León to provide timely intervention to prevent blindness.

A STRUCTURAL ANALYSIS OF THE KEY VARIABLES IN THE IMPLEMENTATION OF THE STRATEGIC INSTITUTIONAL PLAN OF THE UNIVERSIDAD AUTONOMA DE NUEVO LEON (UANL): A CASE OF AN AGREEABLE UNIVERSITY GOVERNMENT

Ponte Academic JournalFeb 2017, Volume 73, Issue 2 A STRUCTURAL ANALYSIS OF THE KEY VARIABLES IN THE IMPLEMENTATION OF THE STRATEGIC INSTITUTIONAL PLAN OF THE UNIVERSIDAD AUTONOMA DE NUEVO LEON (UANL): A CASE OF AN AGREEABLE UNIVERSITY GOVERNMENTAuthor(s): Francisco Ganga Contreras ,Oswaldo Leyva Cordero, Gerardo Tamez GonzalezJ. Ponte - Feb 2017 - Volume 73 - Issue 2 doi: 10.21506/j.ponte.2017.2.1 Abstract:In order for the organizations to be successful, necessarily should base their development in the process of permanent plan, high fully reflexive and consistent, otherwise their actions would not be finished, and will not provide an orientation guide in order to insure the accomplishment of their functions and the consolidation of them. The Universities are not an exception of this reality, on the other side, should be institutions that show the example of a strategic thinking. Considering the previously mentioned reality, this document has as a main objective; analyze the essential variables of the Strategic Institutional Plan of the UANL through a structural analyzes of collective reflection of their prime Institutional Plans. For their evaluation it is employed the qualitative method of prospective analysis trough the matrix system of cross impact-multiplication applied in a classification MIC MAC. Centrally located in the main results spotlight the importance of articulate the projects and activities of the diverse academic and administrative units of the University, with the coherent development in social promotion, equality and sustainable projects, that resorts the transversal universities functions, that will provide an integral formation of social responsible citizens and highly competent in the business world. Download full text:Check if you have access through your login credentials or your institution Username Password

Solar radiation in urban projects: financial analysis of a photovoltaic system for a habitation house in the metropolitan area of monterrey, nuevo leon, mexico.

Photovoltaic systems have been presented as an alternative to the substitution of fossil fuel energy consumption in urban development projects around the world. Their implementation is however dependent on factors with high variability, such as the amount of solar radiation that reaches the ground, climate in the area, consumption patterns, among other things. All these are a direct function of the project’s geographic location. However in the majority of cases, it is economic concerns that finally determine the feasibility of implementation. Therefore, this investigative paper carries out a financial analysis of the implementation of a photovoltaic system for two homes, one with a low degree of energy consumption, and one with a high degree of energy consumption, in the metropolitan area of Monterrey, Nuevo Leon, Mexico, taking into account all factors involved. Amortization tables are made with the results, where it is established the number of years required to recover the investment, with these is possible to financially evaluate the use of photovoltaic paneling that harness the solar resource in Urban Developments in the study area. Our results show that the compressive and flexural strengths of the recycled mortars decrease proportionally to the amount of natural sand replacement used. A similar behavior is observed for the shrinkage due to drying in mortars with low ceramic substitutions (10%, 20% and 30%). Based on these findings, we believe that the use of mortars made with recycled sand (with substitution contents lower than 30%) could be feasible in applications where the mechanical requirements are low.

Surveillance of Methicillin-resistant Staphylococcus aureus Causing Nosocomial Infections in Five Medical Centers of Monterrey, Nuevo León, México from 2005–2009

Staphylococcus aureus is a principal cause of human bacterial infection worldwide. The dissemination of antibiotic resistance among S. aureus strains is very import in the treatment of Staphylococcal infections. We undertook this study to identify methicillin-resistant Staphylococcus aureus (MRSA) clones responsible for nosocomial infection in five medical centers in Monterrey, Nuevo León (N.L.), México from 2005-2009. One hundred ninety MRSA strains collected from 2005-2009 from five hospitals affiliated with the Instituto Mexicano del Seguro Social (IMSS) in Monterrey, N.L., México were characterized by antimicrobial susceptibility, pulsed field gel electrophoresis (PFGE) and Staphylococcal Cassette Chromosome mec (SCCmec) typing. Only one clone was present in the five hospitals (clone C); this clone is strongly associated with the New York-Japan clone (SCCmec II) with a broad resistance profile. This study clearly documented the high ability for dissemination and the persistence of the New York-Japan clone in these centers.

Frequent Neurological Diagnoses through Telemedicine in Nuevo Leon Mexico (P04.234)

Frequent Neurological Diagnoses through Telemedicine in Nuevo Leon Mexico (P04.234)

Projections of Carbon Stocks in Sites Reforested with Pinyon Pine Species in Northeastern Mexico

This research is aimed at fitting growth and yield models at the stand scale to project top height, breast height diameter, basal area, and standing volume of trees, as well as above-ground biomass and carbon dynamics in reforested sites with pinyon pines in Iturbide, Nuevo Leon (NL), Mexico. Data on top height and breast height diameter of three species: Pinus cembroides Zucc., Pinus pinceana Gordon, and Pinus nelsonii Shaw were measured at two sites from 1983 to 2002. Data analysis suggested that at 20 years of age, their mean (standard deviation) recorded standing volume approached values of 45 (33), 31 (16), and 25 (14) m3 ha−1 for P. cembroides, P. pinceana, and P. nelsonii, respectively. Mean (confidence interval) standing volumes of 48 (14) m3 ha−1 were recorded for the deep, loamy soils in bottomlands at Las Adjuntas sites, which was higher than the mean (confidence interval) values recorded for shallow, clay soils in slopes at site La Loma of 19 (3) m3 ha−1. P. cembroides and P. pinceana recorded standing volume and carbon stocks well above values measured in native forests of these species. Therefore, we recommend these pinyon pine species for extensive reforestation projects on the semi-arid lands of northeastern Mexico.

The Transnational National: Race, the Border, and the Immigrant Nationalism of Josefina Niggli's Mexican Village

IN 2003, THE STATE CULTURAL CENTER OF NUEVO LEON, MEXICO, ISSUED Apartate , hermano , a Spanish translation of Mexican American writer Josefina Nigglis Step Down, Elder Brother , originally published in 1947. The small flurry of assessments that followed regarding Niggli's place in the literary history of the region came to a remarkable consensus: that the author was an invisible precursor to the narrative tradition that would later flower in Nuevo Leon. Most would acknowledge the paradox inherent in choosing Niggli as the starting point of the region's literary genealogy, given that she published all of her works in English and in the United States. Yet none raised this as an objection to her newly asserted status as a writer of Monterrey. For ultimately, these evaluations focused not on Niggli's personal identity, but on her subject matter, the themes that she developed, and the perspective from which she wrote.

THE ASSOCIATION OF AEDES AEGYPTI AND AE. ALBOPICTUS IN ALLENDE, NUEVO LEÓN, MEXICO

The recent appearance of Aedes Stegomyia albopictus (Skuse) in Nuevo León (NL) worries health officials. It is a vector of dengue fever in Asia and is more resistant to lower temperatures than Ae. aegypti. The objective of this study was to learn about some ecological parameters of Ae. albopictus and their association with Ae. aegypti, and other culicids in Allende, NL, Mexico, during 1999. Allende is a small town close to metropolitan Monterrey, which has 4 million inhabitants. The design was random with monthly sampling of 175 ovitraps. Chi-square analyses were performed with data of presence, absence, frequency, and relative abundances. During the study, the species Culex tarsalis (Coquillet), Cx. thriambus (Dyar), Cx. pipiens (Linnaeus), Cx. coronator (Dyar and Knab), Ae. albopictus, Ae. aegypti, Toxorhynchites rutilus (Coquillet), and Ae. triseriatus (Say) were found. April is the month for large numbers of mosquito species. September had the highest populations in positive ovitraps (66.67%), followed by July (63.27% of traps). Aedes aegypti was the most abundant (65.13%), followed by Ae. albopictus (19.71%). Both Ae. albopictus and Ae. aegypti were found from April until December. Aedes aegypti was more abundant than Ae. albopictus, except in August, when they were similar (chi2 = 0.197, P < 0.05). We found significant association between the presence of both species for every study month (chi2 = 9.837, P < 0.05), with a contingency coefficient of 0.247. September and November were the months having the most mosquitoes in this association. Only considering Ae. albopictus, more were found in ovitraps in July (34.6%), followed by September (33.3%). However, its presence was not significant throughout the year. Of 2 zones, in town and at the river, prevalence indicated that Ae. albopictus preferred the river. This mosquito is in its establishment phase in this area and requires further studies.

The leaf design of Mexican mesquites ( Prosopis, Mimosoideae)

The first purpose of this work is to aid in the calculation of aboveground biomass that is largely leaves. The second objective is to gain insight into racial leaf design as leaves change from small to large along the south-to-north climatic gradient in Mexico. Leaflet length (LL) varies with leaflet rachis length (LR) as LR= a+LL x or LR=a+ LL ln x , or another similar equation, and in the 50 tree Monterrey, Nuevo León (NL) mezquital (mesquite wood), the relation is a straight line. The length of the petiole (LP) also varies with LL and LR as these three variables depend on elongation. Leaves with two pairs of raches (2PR=2pinnae) are smaller than 1PR leaves on the same tree. Desertic mesquites with 5–6 mm LL with the smallest possible leaves can be treated separately, although they freely cross with temperate races with 38–40 mm LL. The unknown 2PR relations and effects as well as high natural variance make the prediction of one foliar part from another somewhat risky. Neighboring similar trees can have fair or no correlations in the same and also in different foliar equations so that confidence in repeatability is low. The prediction of leaf area from LR and the prediction of biomass require future studies. At present, each individual locality such as a plantation requires its separate measurements.

White-Throated or Bat Falcon in Nuevo León, México

White-Throated or Bat Falcon in Nuevo León, México