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Search Results: 1 - 10 of 11876 matches for " Elizabeth; Salazar "
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A new rhabdiasid species from Craugastor occidentalis (Anura: Brachycephalidae) from Sierra de Manantlan, Jalisco, Mexico
Martínez-Salazar, Elizabeth A.;
Revista mexicana de biodiversidad , 2008,
Abstract: rhabdias manantlanensis n. sp., parasite of the lungs of craugastor occidentalis is illustrated and described. rhabdias manantlanensis differs from related species in the genus by the combination of the following characters: elongated body, cuticle slightly swollen (thin and smooth), 6 weakly developed lips (4 submedian + 2 lateral), localization of nerve ring at 193-244 (220) urn from anterior end, muscular corpus slightly inflated, esophagus length/ body length ratio 5.11-6.57 (5.79%), tail relatively small, conical and with sharp terminal point, tail length/ body length ratio 1.48-3.27 (2.48) %, slightly pre-equatorial vulva (vulva length / body length ratio 41.66-51.59 [47.74] %), and cup-shape buccal capsule (11-19 [13] x 19-27 [21]). this is the seventeenth species of the genus rhabdias described in the neotropical realm and the third described in the sierra madre del sur, mexico.
A new rhabdiasid species from Craugastor occidentalis (Anura: Brachycephalidae) from Sierra de Manantlan, Jalisco, Mexico Una especie nueva de rhabdiásido de Craugastor occidentalis (Anura: Brachycephalidae) de la sierra de Manantlán, Jalisco, México
Elizabeth A. Martínez-Salazar
Revista mexicana de biodiversidad , 2008,
Abstract: Rhabdias manantlanensis n. sp., parasite of the lungs of Craugastor occidentalis is illustrated and described. Rhabdias manantlanensis differs from related species in the genus by the combination of the following characters: elongated body, cuticle slightly swollen (thin and smooth), 6 weakly developed lips (4 submedian + 2 lateral), localization of nerve ring at 193-244 (220) urn from anterior end, muscular corpus slightly inflated, esophagus length/ body length ratio 5.11-6.57 (5.79%), tail relatively small, conical and with sharp terminal point, tail length/ body length ratio 1.48-3.27 (2.48) %, slightly pre-equatorial vulva (vulva length / body length ratio 41.66-51.59 [47.74] %), and cup-shape buccal capsule (11-19 [13] x 19-27 [21]). This is the seventeenth species of the genus Rhabdias described in the Neotropical realm and the third described in the Sierra Madre del Sur, Mexico. Se describe e ilustra Rhabdias manantlanensis n. sp., parásito pulmonar de Craugastor occidentalis. Rhabdias manantlanensis difiere de las otras especies relacionadas del género por la combinación de los siguientes caracteres: cuerpo alargado, cutícula ligeramente ensanchada (delgada y lisa), 6 labios débilmente desarrollados (4 submediales y 2 laterales), localización del anillo nervioso a 193-244 (220) |im de la región anterior, corpus esofágico ligeramente ensanchado; relación longitud del esófago/ longitud corporal 5.11-6.57 (5.79) %, cola relativamente peque a, cónica y con una terminación en punta, relación longitud de la cola/ longitud corporal 1.48-3.27 (2.48) %, vulva ligeramente pre-ecuatorial (relación longitud de la vulva/ longitud corporal 41.66-51.59 [47.74] %), y una cápsula bucal en forma de copa (11-19 [13] x 19-27 [21]). Con ésta son 17 especies del género Rhabdias descritas de la región neotropical y la tercera en la Sierra Madre del Sur, México.
Historical explanation of the origin of the herpetofauna of Mexico
Flores-Villela, Oscar;Martínez-Salazar, Elizabeth A.;
Revista mexicana de biodiversidad , 2009,
Abstract: a hypothesis of historical area relationships for mexico, central, and south america was investigated by a cladistic biogographic analysis using 10 taxon cladograms of the herpetofauna of mexico. a hypothesis is presented based on previous narrative biogeographic scenarios and compared with the general area cladograms (gacs) obtained using reconciled trees of component 2.0 and brooks parsimony analysis (bpa). for tree reconciliation, 1 000 trees were saved after the analysis. bpa yielded 18 gacs (ci = 0.805, ri= 0.549). the gac derived from tree reconciliation is more or less pectinate and has only 3 groups of 2 areas each. these groups consist of the chihuahuan and sonoran deserts as sister areas on the one hand (dchi, dson), and the sierra madre oriental and occidental as sister areas on the other (smor, smoc). this latter clade is sister to the chihuahuan and sonoran desert clade. the third group has the transvolcanic belt and sierra madre del sur as sister areas (tva, smex). the gac obtained by bpa showed 4 main groups of areas: the first is comprised of the pacific coast of mexico and the balsas depression (pcbal), the sierra madre del sur (smex), and the transvolcanic belt (tva); the second group includes the sierra madre oriental (smor), sierra madre occidental (smoc), sonoran (dson) and chihuahuan deserts (dchi); the third comprised the highlands of chiapas and guatemala (chig), the eastern lowlands, on the atlantic coast (ell) and the semiarid lands of tamaulipas-texas (tams); the fourth group contains the western lowlands, in the pacific coast (wll) and northern south america (sa); the talamanca ridge (tala) is isolated at the base of the 3 first groups. the gac from narrative biogeography contains 3 groups: the first has areas of northern mexico (dson, dchi, tamps), the second has areas from central mexico (pcbal, smor, smoc, tv a), and third has areas from southern mexico and central america (smex, chig, tala, wll, ell, sa). in general, the gac from the
Historical explanation of the origin of the herpetofauna of Mexico Explicación histórica del origen de la herpetofauna de México
Oscar Flores-Villela,Elizabeth A. Martínez-Salazar
Revista mexicana de biodiversidad , 2009,
Abstract: A hypothesis of historical area relationships for Mexico, Central, and South America was investigated by a cladistic biogographic analysis using 10 taxon cladograms of the herpetofauna of Mexico. A hypothesis is presented based on previous narrative biogeographic scenarios and compared with the general area cladograms (GACs) obtained using reconciled trees of COMPONENT 2.0 and Brooks Parsimony Analysis (BPA). For tree reconciliation, 1 000 trees were saved after the analysis. BPA yielded 18 GACs (CI = 0.805, RI= 0.549). The GAC derived from tree reconciliation is more or less pectinate and has only 3 groups of 2 areas each. These groups consist of the Chihuahuan and Sonoran deserts as sister areas on the one hand (DCHI, DSON), and the Sierra Madre Oriental and Occidental as sister areas on the other (SMOR, SMOC). This latter clade is sister to the Chihuahuan and Sonoran desert clade. The third group has the Transvolcanic Belt and Sierra Madre del Sur as sister areas (TVA, SMEX). The GAC obtained by BPA showed 4 main groups of areas: the first is comprised of the Pacific coast of Mexico and the Balsas Depression (PCBAL), the Sierra Madre del Sur (SMEX), and the Transvolcanic Belt (TVA); the second group includes the Sierra Madre Oriental (SMOR), Sierra Madre Occidental (SMOC), Sonoran (DSON) and Chihuahuan deserts (DCHI); the third comprised the Highlands of Chiapas and Guatemala (CHIG), the Eastern Lowlands, on the Atlantic coast (ELL) and the Semiarid Lands of Tamaulipas-Texas (TAMS); the fourth group contains the Western Lowlands, in the Pacific coast (WLL) and northern South America (SA); the Talamanca Ridge (TALA) is isolated at the base of the 3 first groups. The GAC from narrative biogeography contains 3 groups: the first has areas of northern Mexico (DSON, DCHI, TAMPS), the second has areas from central Mexico (PCBAL, SMOR, SMOC, TV A), and third has areas from southern Mexico and Central America (SMEX, CHIG, TALA, WLL, ELL, SA). In general, the GAC from the BPA analysis shared more groups with the hypothesis of narrative biogeography; when compared to the GAC obtained via reconciled trees; however, all the GACs obtained are topologically distinct. Accounting for the lack of congruence between the narrative biogeography GAC, reconciled tree analysis and BPA, is challenging due to several factors: 1), erroneous interpretation of vicariant events when constructing the narrative area cladogram; 2), lack of congruence among patterns of speciation and endemism for the taxa used in this analysis; 3), the region under study is a geologically complex zone
Symptom severity and viral protein or RNA accumulation in lettuce affected by big-vein disease Severidad de síntomas y acumulación de proteínas o ARN virales en lechugas afectadas por la enfermedad de las venas grandes
Carolina Araya,Elizabeth Pe?a,Erika Salazar,Lisset Román
Chilean Journal of Agricultural Research , 2011,
Abstract: Big-vein disease (BVD) is a widespread and economically damaging disease in lettuce (Lactuca sativa L.). Typical symptoms are chlorotic clearing around leaf veins, leaf deformations, and impaired head development. In this research, we studied the relationship between symptom intensity and protein and viral RNA accumulation in infected plants. Naturally infected lettuce plants, from the field or greenhouse, were classified according to their symptomatology: mild, moderate, severe, and symptomless. Coat protein accumulation was evaluated by a double antibody sandwich/enzyme-linked immunosorbent assay (DAS-ELISA), and RNA levels were studied by semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) and quantitative RT-PCR. Virus coat protein accumulation did not differ for the two viruses associated with this disease among lettuce plants showing different symptom severity. Similarly, abundance of Mirafiori lettuce big-vein virus (MLBVV)-RNA3 or Lettuce big-vein associated virus (LBVaV)-RNA-2 were not different (P > 0.05) for diverse big vein disease severity rating scales. This suggests that symptom severity expressed by big-vein diseased lettuce plants did not necessarily reflect the accumulation of viruses associated with this disease in the host. Therefore, lettuce plants showing mild symptoms of BVD do not necessarily present lower virus levels than plants showing more severe symptomatology. La enfermedad de las venas grandes de la lechuga (Lactuca sativa L.) es de origen viral, está ampliamente distribuida en el mundo, y provoca graves da os económicos en este cultivo. Los síntomas típicos de la enfermedad son clorosis alrededor de las venas, deformación de hojas y ausencia de formación de cabezas. En este trabajo se estudió la relación entre la intensidad de síntomas y la acumulación de proteínas y ARNs de origen viral en plantas afectadas por esta enfermedad. Lechugas infectadas naturalmente, provenientes de campo y de invernadero fueron clasificadas con sintomatología leve, intermedia, severa, y asintomáticas. La acumulación de proteínas de cubiertas virales fue evaluada utilizando DAS-ELISA (sandwich con doble anticuerpo-ensayo inmunoabsorbente ligado a enzima), y los niveles de ARN viral se estudiaron por medio de transcripción reversa-reacción en cadena de la polimerasa (RT-PCR) semicuantitativa y RT-PCR cuantitativa. No hubo diferencia en la acumulación de proteínas virales para los dos virus asociados a esta enfermedad, al comparar plantas de lechugas con distintos niveles de severidad de síntomas. De forma similar, cuando
Automatic Information Processing Bias to Stress Factors by Older Adults with and without Diabetes  [PDF]
Perla Lizeth Hernández-Cortés, López Ramírez Ernesto Octavio, Guadalupe Elizabeth Morales Martínes, Bertha Cecilia Salazar-González
Advances in Aging Research (AAR) , 2014, DOI: 10.4236/aar.2014.33032
Abstract:

A sample of 65 older adults (with and without diabetes) as well as a sample of 84 healthy young people were required to take affective priming studies to compare recognition latencies of stress related word pairs against recognition latencies of positive, negative and neutral word pairs. Moreover, older adults took a stress questionnaire related to relevant disturbing events in the third age. The goal was to test any automatic emotional processing bias to these events. Results suggested that even when people with diabetes obtained low stress test scores, they showed automatic cognitive bias to process stressful events differently than older adults without diabetes and young people. This suggested that people with diabetes patients’ controlled strategies to cope with stress might not be aware of such an automatic cognitive bias. It is argued that this information processing style to stressful events makes patients prone to cognitive emotional vulnerability.

Systematic Thinking Underlying People with Diabetes’ Beliefs on Health Outcomes: An Information Integration Theory Approach  [PDF]
Perla Lizeth Hernández-Cortés, Guadalupe Elizabeth Morales Martínes, López Ramírez Ernesto Octavio, Bertha Cecilia Salazar-González
Advances in Aging Research (AAR) , 2014, DOI: 10.4236/aar.2014.34040
Abstract: A sample of 76 older adults (27 with diabetes and 49 without diabetes) were selected to judge three information factors, metamemory related to—drug organization—stress and physical activity in relation to their perception of self-care. In order to do so, an Integration Information Theory was considered to determine systematic cognitive algebra rules underlying judgment about 24 different health self-care scenarios. Results indicate that older adults without diabetes use a summative cognitive rule to integrate relevant health information but older adults with diabetes do not. Both groups agreed that metamemory was the most relevant factor to their self-care followed by stress and physical activity. However, valuation of these factors does depend on the type of group. Implications of these results to healthcare a behavioral nursing intervention are discussed in this paper.
Number of casual male sexual partners and associated factors among men who have sex with men: Results from the National HIV Behavioral Surveillance system
Eli S Rosenberg, Patrick S Sullivan, Elizabeth A DiNenno, Laura F Salazar, Travis H Sanchez
BMC Public Health , 2011, DOI: 10.1186/1471-2458-11-189
Abstract: Data are from the first MSM cycle of the National HIV Behavioral Surveillance system, conducted from 2003 to 2005. Relationships between number of casual male sex partners within the previous year and demographic information, self-reported HIV status, and risk behaviors were determined through regression models.Among 11,191 sexually active MSM, 76% reported a casual male partner. The median casual partner number was three. Lower number of casual partners was associated with black race, Hispanic ethnicity, and having a main sex partner in the previous year. Factors associated with a higher number included gay identity, exchange sex, both injection and non-injection drug use. Being HIV-positive was associated with more partners among non-blacks only. Age differences in partner number were seen only among chat room users.MSM who were black, Hispanic or had a main sex partner reported fewer casual sex partners. Our results suggest specific populations of MSM who may benefit most from interventions to reduce casual partner numbers.Men who have sex with men (MSM) have consistently been the most heavily impacted risk group in the US HIV epidemic. Recent evidence confirms that MSM in the United States [1] and in other industrialized countries [2] are experiencing a resurgence in HIV transmissions since at least 2000. In the United States, MSM of color, especially younger MSM, are particularly affected in terms of new HIV infections in recent years [3].The reasons for racial/ethnic disparities in HIV infection are unclear, but it is likely that these disparities are explained by a complex set of behavioral, network, structural and, perhaps, biological factors [4,5]. Understanding trends in behavioral risks, and how these risks differ in subpopulations of MSM, is critical to design and disseminate HIV prevention programs to curb new HIV transmissions. A number of behavioral factors are important to HIV transmission patterns in MSM, including numbers and types of sex partners,
ANTAGONISMO DE Pseudomonas fluorescens Migula FRENTE A Fusarium oxysporum fsp. pisi Schtdl EN ARVEJA Pisum sativum L.
Guerra,Germán Andrés; Betancourth,Carlos Arturo; Salazar,Claudia Elizabeth;
Revista U.D.C.A Actualidad & Divulgación Científica , 2011,
Abstract: the yellowing pea caused by fusarium oxysporum is the most problem in the crop and its damage to bring economic losses. this research was carried out in the laboratory and greenhouse of the university of nari?o, located at 2486 masl to an average temperature of 13°c., in order to evaluate the antagonism of p. fluorescent facing f. oxysporum on pea pisum sativum l. the isolation of f. oxysporum affected tissue was made from roots and stems of pea plants, which were multiplied and purified on pda, strain selection was based on the prevalence in all zones and the speed in their growth, obtaining the strain ftr. the isolation of p. fluorescent was made from roots and stems of healthy pea plants that were in focus with yellowing, which were purified and multiplied in selective cetrimide agar, obtaining strains ppc, ppo and ppl; after biochemical tests. the tests were made in dual in medium nutrient agar, in which the strain showed higher ppc antagonism to control the growth of f. oxysporum under in vitro conditions in the laboratory. in greenhouse tests the incidence rose from 90.31% to 6.55% with the bacteria compared with the control, showing the efficiency of the antagonistic strain p. fluorescens ppc in the control of f. oxysporum under controlled conditions.
Determinación irreversible a la floración del aguacate 'Hass' en Michoacán
Rocha-Arroyo, José Luis;Salazar-García, Samuel;Bárcenas-Ortega, Ana Elizabeth;
Revista mexicana de ciencias agrícolas , 2010,
Abstract: the aim of this study was to specify periods in which occurs irreversible determination to flowering in apical bud of vegetative sprout for winter, spring and summer flows in avocado orchards with and without irrigation set under four climatic conditions. the study was carried out during 2006-2008, in six commercial orchards for avocado 'hass' in state of michoacán, mexico. in each orchard 20 trees were selected and in each one 30 sprouts of each vegetative flow were labeled. treatments consisted on girdling and defoliation of a sprout per tree every fifteen days for each vegetative flow. localitites climate, influenced on the date in which occurred irreversible determination to flowering in sprouts of the three vegetative flows, it occurred earlier in temperate climate than in warm. after emergence, the sprouts of winter flow required more time to reach the irreversible determination to flowering than of spring and summer flows. the irreversible determination to flowering in winter, spring and summer flows sprouts it occurred from may 30 to july 23, from may 28 to september 26 and from june 10 to september 15, respectively, and from 29 to 42 days earlier in orchards without irrigation. in floral development scale, the number of irreversible determined to flowering buds ranged from 3 to 4 in winter sprouts, from 3 to 5 in spring and from 1 to 4 in summer.
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