oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 80 )

2019 ( 785 )

2018 ( 891 )

2017 ( 826 )

Custom range...

Search Results: 1 - 10 of 514029 matches for " José A. Palacios "
All listed articles are free for downloading (OA Articles)
Page 1 /514029
Display every page Item
Plants and Islands revisited
José María Fernández-Palacios
Frontiers of Biogeography , 2012,
Abstract:
Josep M. Delgado Ribas, Dinámicas imperiales (1650-1796): Espa a, América y Europa en el cambio institucional del sistema colonial espa ol
José María Fernández Palacios
América Latina en la historia económica , 2010,
Abstract:
Proposed Scales for Measuring Suicidal Ideation in Adult Cancer Patients  [PDF]
Diego Armando Leal-Hernández, Lucía Sandoval, Ximena Palacios-Espinosa, José Rafael Tovar Cuevas
Open Journal of Medical Psychology (OJMP) , 2014, DOI: 10.4236/ojmp.2014.31010
Abstract: Suicidal ideation, which can occur in oncology patients, is associated with suffering and a reduced quality of life. Empirical studies indicate that the incidence of suicide in people with cancer is approximately twice that of the general population. Objective: This cross-sectional descriptive study was designed to establish the prevalence of suicidal ideation in adult oncology patients based on a combination of scales to measure this variable. Method: A battery of three instruments (Scale for Suicidal Ideation. Item 9 of Beck’s Depression Inventory, and a semi-structured interview) was used to make estimates that are not based on just one test and can thus make a comprehensive evaluation of suicidal ideation in the study sample. Four approximations, based on different items from suicidal ideation assessment scales, were developed to determine the most sensitive combination for identifying the presence of suicidal ideation in adult cancer patients. Results: The highest prevalence of suicidal ideation found with the proposed scales was 24.5% (CI = 16%-33%) with Scale 1; 23.6% (CI = 15.2%-32%) with Scale 2; and 19.1% (CI = 11.3%-26.9%) with Scale 4. The lowest prevalence of suicidal ideation was 17.3% (CI = 9.8%-24.8%) with Scale 3. Conclusions: Suicidal behavior in the oncology patient should be assessed; however, there is a need to select sensitive instruments that can be applied easily and are suitable for the target group, which faces difficulties in participating in extensive evaluations.
RB1 gene mutation up-date, a meta-analysis based on 932 reported mutations available in a searchable database
José R Valverde, Javier Alonso, Itziar Palacios, ángel Pesta?a
BMC Genetics , 2005, DOI: 10.1186/1471-2156-6-53
Abstract: A searchable database (RBGMdb) has been constructed with 932 published RB1 mutations. The spectrum of these mutations has been analyzed with the following results: 1) the retinoblastoma protein is frequently inactivated by deletions and nonsense mutations while missense mutations are the main inactivating event in most genetic diseases. 2) Near 40% of RB1 gene mutations are recurrent and gather in sixteen hot points, including twelve nonsense, two missense and three splicing mutations. The remainder mutations are scattered along RB1, being most frequent in exons 9, 10, 14, 17, 18, 20, and 23. 3) The analysis of RB1 mutations by country of origin of the patients identifies two groups in which the incidence of nonsense and splicing mutations show differences extremely significant, and suggest the involvement of predisposing ethnic backgrounds. 4) A significant association between late age at diagnosis and splicing mutations in bilateral retinoblastoma patients suggests the occurrence of a delayed-onset genotype. 5) Most of the reported mutations in low-penetrance families fall in three groups: a) Mutations in regulatory sequences at the promoter resulting in low expression of a normal Rb; b) Missense and in-frame deletions affecting non-essential sequence motifs which result in a partial inactivation of Rb functions; c) Splicing mutations leading to the reduction of normal mRNA splicing or to alternative splicing involving either true oncogenic or defective (weak) alleles.The analysis of RB1 gene mutations logged in the RBGMdb has shown relevant phenotype-genotype relationships and provided working hypothesis to ascertain mechanisms linking certain mutations to ethnicity, delayed onset of the disease and low-penetrance. Gene profiling of tumors will help to clarify the genetic background linked to ethnicity and variable expressivity or delayed onset phenotypes.Retinoblastoma (MIM# 180200), a rare embryonic neoplasm of retinal origin, is the most common intraocular tum
Effects of floral display and plant abundance on fruit production of Ryncholaelia glauca (Orchidaceae)
Flores-Palacios,Alejandro; García-Franco,José G.;
Revista de Biología Tropical , 2003,
Abstract: flowering plant density can increase number of visits and fruit set in multi-flowering plants, however this aspect has not been studied on few flower species. we studied the effects of individual floral display and plant density on the fruit production of the epiphytic, moth-pollinated orchid, ryncholaelia glauca, in an oak forest of chavarrillo, veracruz, mexico. species is nonautogamous, and produced one flower per flowering shoot each flowering season. we hypothesized that orchids with more flowering shoots and those on trees with clumps of conspecific should develop more fruits than isolated ones. r. glauca population flowers synchronously, and individual flowers last up to 18 days, with flowers closing rapidly after pollination. individuals produced few flowers per year, although some plants developed flowers in both seasons and fewer of them developed fruits both years. there was no relationship between flower number per orchid, or per host tree, with the number of fruits developed per plant. host trees with flowering and fruiting orchids were randomly dispersed and the pattern of distribution of flowering and fruiting plants was not related. apparently, pollinators visit the flowers randomly, with no evidence of density dependence. the fruit set of r. glauca was as low as fruit set of multiflowered orchids moth pollinated, suggesting that fruit set on moth pollinated orchids could be independent of the number of flowers displayed.
Political erosion dismantles the conservation network existing in the Canary Islands
José María Fernández‐Palacios,Lea de Nascimento
Frontiers of Biogeography , 2011,
Abstract:
Inhibidores de proteasas en papas resistentes y susceptibles a la mosca minadora Liriomyza huidobrensis (Diptera: Agromyzidae) Protease inhibitors in potatoes resistant and susceptible to leaf the miner fly Liriomyza huidobrensis (Diptera: Agromyzidae)
JOSé OLIVERA,MARíA PALACIOS,JORGE TENORIO,áLVARO MARCELO
Revista Colombiana de Entomología , 2007,
Abstract: Se estudiaron las diferencias bioquímicas entre cuatro clones de papa resistentes (220LM87B, 662LM86B, 136LM86B y cultivar María Tambe a) y uno susceptible (cultivar Revolución) a la mosca minadora Liriomyza huidobrensis mediante comparación del grado de inhibición de la actividad proteolítica de la tripsina sintética y de los extractos de larvas de la mosca por acción de las proteínas totales extraídas de hojas da adas de los clones. La actividad proteolítica, en unidades relativas, por efecto de los clones 662LM86B, 136LM86B, 220LM87B, María Tambe a, y Revolución sobre la actividad de la tripsina fue 1,7; 2,5; 1,8; 1,3 y 2,4 y sobre la actividad de los extractos de larvas fue 0,24; 0,4; 0.6; 0,1 y 0,5 respectivamente. Por otro lado, la inhibición de la actividad proteolítica de la tripsina por las proteínas de los cultivares María Tambe a y Revolución fue del 93% y 77% respectivamente. Finalmente, usando la técnica de zimografía se identificó una banda de inhibidores de proteasas de 105 KDa y otra de 63 KDa; el grado de intensidad de esas bandas fue mayor en los clones resistentes. La banda de 105 kDa mostró una intensidad de hasta 4,2 veces en el cultivar Maria Tambe a con respecto a Revolución. Los resultados demuestran diferencias en la inhibición de la actividad proteolítica y en la presencia de la banda de 105 kDa entre los clones resistentes y susceptibles a la mosca minadora lo cual sugiere a los inhibidores de proteasas como factores importantes en la resistencia de estos clones a la mosca minadora. Abstract Biochemical differences were studied among five potato clones: four resistant (220LM87B, 662LM86B, 136LM86B and cultivar María Tambe a) and one susceptible (cultivar Revolución) to attack of the leafminer fly Liriomyza huidobrensis (Diptera, Agromyzidae) through a comparison of the degree of inhibition of the proteolytic activity of synthetic trypsin and extracts of leafminer larvae by action of total proteins extracted from the leaves of the different potato clones before damage. The proteolytic activity, in relative units, of the clones 662LM86B, 136LM86B, 220LM87B, María Tambe a, and Revolution on trypsin activity were 1.7, 2.5, 1.8, 1.3, and 2.4, and on larval extracts were 0.24, 0.4, 0.6, 0.1 and 0.5, respectively. In contrast, when inhibition of the proteolytic activity of trypsin from proteins of the cultivars María Tambe a and Revolución was quantified, there was an inhibition of 93% and 77%, respectively. Finally, using zymography, two bands of protease inhibitors were identified, one 105 kDa and the other 63 kDa; the degree of in
Effects of floral display and plant abundance on fruit production of Ryncholaelia glauca (Orchidaceae)
Alejandro Flores-Palacios,José G. García-Franco
Revista de Biología Tropical , 2003,
Abstract: Flowering plant density can increase number of visits and fruit set in multi-flowering plants, however this aspect has not been studied on few flower species. We studied the effects of individual floral display and plant density on the fruit production of the epiphytic, moth-pollinated orchid, Ryncholaelia glauca, in an oak forest of Chavarrillo, Veracruz, Mexico. Species is nonautogamous, and produced one flower per flowering shoot each flowering season. We hypothesized that orchids with more flowering shoots and those on trees with clumps of conspecific should develop more fruits than isolated ones. R. glauca population flowers synchronously, and individual flowers last up to 18 days, with flowers closing rapidly after pollination. Individuals produced few flowers per year, although some plants developed flowers in both seasons and fewer of them developed fruits both years. There was no relationship between flower number per orchid, or per host tree, with the number of fruits developed per plant. Host trees with flowering and fruiting orchids were randomly dispersed and the pattern of distribution of flowering and fruiting plants was not related. Apparently, pollinators visit the flowers randomly, with no evidence of density dependence. The fruit set of R. glauca was as low as fruit set of multiflowered orchids moth pollinated, suggesting that fruit set on moth pollinated orchids could be independent of the number of flowers displayed. La densidad de plantas floreciendo puede incrementar la tasa de visitas de polinizadores y la producción de frutos en plantas con inflorescencias multiflorales; sin embargo, este aspecto no ha sido estudiado en plantas con inflorescencias de una sola flor. En un encinar tropical de Chavarrillo, Veracruz, México, estudiamos el efecto de la densidad de plantas con flores y del despliegue floral en la producción de frutos de la orquídeas epífita, polinizada por polillas, Ryncholaelia glauca. La especie no es autógama y produce sólo una flor por eje de crecimiento, por a o. La población de R. glauca florece sincronizadamente, las flores individuales duran más de 18 días y aquellas polinizadas se cierran rápidamente. Hipotetizamos que orquídeas con más ejes de crecimiento y aquellas en árboles con grupos de plantas floreciendo deben desarrollar más frutos que aquellas aisladas. Las plantas produjeron pocas flores por a o, algunas plantas desarrollaron flores en ambos a os y muy pocas desarrollaron frutos en ambos a os. El número de frutos producidos por planta no estuvo relacionado con el número de flores por planta ni con e
A new Pseudachorutes (Collembola, Neanuridae, Pseudachorutinae) from Nicaragua
José Palacios Vargas,Hugo Mejía-Madrid
ZooKeys , 2012, DOI: 10.3897/zookeys.187.2362
Abstract: A new species of Pseudachorutes is described and illustrated from Nicaragua. Pseudachorutes nica sp. n. is very easy to distinguish from other members of this genus from Central America, because its chaetotaxy consists of macro and microsetae and a postantennal organ with multiple vesicles (close to 20).
Mediastinal Actinomycosis. A Case-Report  [PDF]
Luciano Santana-Cabrera, Ana Casamitjana-Ortega, José María López-Vega, Cristina Rodríguez-Escot, Manuel Sánchez-Palacios
International Journal of Clinical Medicine (IJCM) , 2011, DOI: 10.4236/ijcm.2011.25105
Abstract: Thoracic actinomycosis is a rare disease in the era of antibiotics. Infection involving the mediastinum is extremely infrequent and the symptoms are nonspecific. It’s very important to include actinomycosis in the differential diagnosis of pulmonary affections and mediastinal masses. We present a case of posterior mediastinal mass found on chest computed tomography and the patient was treated with penicillin and fully recovered.
Page 1 /514029
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.