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Search Results: 1 - 10 of 195716 matches for " KAREN D LEDIUK "
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Primer registro de Podosphaera pannosa (Ascomycota) sobre Rosa canina en Argentina
Lediuk,Karen D.; Lorenzo,Laura; Damascos,María A.;
Bolet?-n de la Sociedad Argentina de Bot??nica , 2010,
Abstract: this is the first record of rosa canina l. as a host of podosphaera pannosa (wallr.) de bary in argentina. although developed on different plant organs (leaves, stems and fruits) this pathogen does not seem to affect appreciably the growth of the exotic shrub.
Infestación de Megastigmus aculeatus (Hymenoptera: Chalcidoidea) en las semillas de rosas exóticas invasoras de comunidades naturales de la Patagonia andina de Argentina
LEDIUK,KAREN D; DAMASCOS,MARíA A; KUN,MARCELO E;
Revista chilena de historia natural , 2012, DOI: 10.4067/S0716-078X2012000100012
Abstract: megastigmus aculeatus swederus (hymenoptera: chalcidoidea) infest rosa species seeds both at the origin and invasion areas. the wasp larvae develop by consuming the entire seed. the m. aculeatus infestation was analyzed at different rosa canina l. and rosa rubiginosa l. populations and at isolated plants of rosa multiflora thunb. at norwestern patagonian natural areas of argentina. in r. rubiginosa, the most abundant species, we studied the wasp infestation prevalence and success and the possible infestation effect on fruit size. in this paper we registered the first records of r. canina and r. rubiginosa as host plants for m. aculeatus in wild areas of argentina and we verified the absence of the wasp in r. multiflora fruits. in r. canina the percentage of infected fruits by m. aculeatus was low (0-1 % per site) not being probably a conditioning factor of its actual reduced spread. in r. rubiginosa, the percentage was high (31-75 % of infested fruits per sites), but only the 2-8 % of achenes were infected. considering the analyzed sites, the distribution of m. aculeatus infestation at regional level in rose studied species was reduced. the fruit size was not affected by the insect infestation. the results of this work show a low actual impact of m. aculeatus in the control of rose invasion at andean region of argentina. however, since m. aculeatus populations could be affect by the temperature, a change of this variable could increase the seeds infestation prevalence in the medium and long term.
Infestación de Megastigmus aculeatus (Hymenoptera: Chalcidoidea) en las semillas de rosas exóticas invasoras de comunidades naturales de la Patagonia andina de Argentina Megastigmus aculeatus infestation on seeds of exotic roses invading wild communities of Andean Patagonia from Argentina
KAREN D LEDIUK,MARíA A DAMASCOS,MARCELO E KUN
Revista chilena de historia natural , 2012,
Abstract: Megastigmus aculeatus Swederus (Hymenoptera: Chalcidoidea) infesta las semillas de especies de Rosa tanto en las áreas de origen como en las de invasión. La larva de la avispa se desarrolla consumiendo la totalidad de la semilla. Se analizó la infestación de M. aculeatus en diferentes poblaciones de Rosa rubiginosa L. y Rosa canina L. y en plantas aisladas de Rosa multiflora Thunb. en áreas naturales del Noroeste de la Patagonia, Argentina. En R. rubiginosa, la especie más abundante, estudiamos la prevalencia y éxito de infestación por la avispa y el posible efecto sobre el tama o del fruto. En este trabajo se presentan los primeros registros de R. rubiginosa y R. canina como especies hospedadoras de M. aculeatus en Argentina y se verifica su ausencia en las semillas de R. multiflora. En R. canina, el porcentaje de frutos infestados por M. aculeatus fue bajo (0-1 % por sitio), no siendo probablemente un factor condicionante de la reducida distribución de la planta. En R. rubiginosa, ese porcentaje fue alto (31-75 % de frutos infestados por sitio), pero solo el 2-8 % de los aquenios estaban infestados. Considerando los sitios analizados, la distribución a nivel regional de la infestación por M. aculeatus en las especies de rosas estudiadas es reducida. El tama o del fruto no es afectado por la infestación del insecto. Los resultados de este trabajo muestran un bajo impacto actual de M. aculeatus en el control natural de la invasión de las rosas en la región andina de Argentina. Sin embargo, dado que las poblaciones de M. aculeatus podrían ser afectadas por la temperatura, un cambio en esta variable podría incrementar la prevalencia de infestación de las semillas de estos arbustos a mediano y largo plazo. Megastigmus aculeatus Swederus (Hymenoptera: Chalcidoidea) infest Rosa species seeds both at the origin and invasion areas. The wasp larvae develop by consuming the entire seed. The M. aculeatus infestation was analyzed at different Rosa canina L. and Rosa rubiginosa L. populations and at isolated plants of Rosa multiflora Thunb. at Norwestern Patagonian natural areas of Argentina. In R. rubiginosa, the most abundant species, we studied the wasp infestation prevalence and success and the possible infestation effect on fruit size. In this paper we registered the first records of R. canina and R. rubiginosa as host plants for M. aculeatus in wild areas of Argentina and we verified the absence of the wasp in R. multiflora fruits. In R. canina the percentage of infected fruits by M. aculeatus was low (0-1 % per site) not being probably a conditioning factor
Primer registro de Podosphaera pannosa (Ascomycota) sobre Rosa canina en Argentina First record of Podosphaera pannosa (Ascomycota) on Rosa canina in Argentina
Karen D. Lediuk,Laura Lorenzo,María A. Damascos
Boletín de la Sociedad Argentina de Botánica , 2010,
Abstract: Se cita por primera vez a Rosa canina L. como hospedador del oídio Podosphaera pannosa (Wallr.) de Bary en Argentina. A pesar de desarrollarse sobre diferentes órganos de la planta (hojas, tallo y frutos) este patógeno no parece afectar de manera apreciable el crecimiento del arbusto exótico. This is the first record of Rosa canina L. as a host of Podosphaera pannosa (Wallr.) de Bary in Argentina. Although developed on different plant organs (leaves, stems and fruits) this pathogen does not seem to affect appreciably the growth of the exotic shrub.
Evaluation and revision of questionnaires for use among low-literacy immigrant Latinos
T. D'Alonzo, Karen;
Revista Latino-Americana de Enfermagem , 2011, DOI: 10.1590/S0104-11692011000500025
Abstract: as more spanish speaking immigrants participate in and become the focus of research studies, questions arise about the appropriateness of existing research tools. questionnaires have often been adapted from english language instruments and tested among college-educated hispanic-americans. little has been written regarding the testing and evaluation of research tools among less educated latino immigrants. the purpose of this study was to evaluate and revise a battery of spanish-language questionnaires for an intervention among immigrant hispanic women. a three-step process was used to evaluate, adapt and test spanish versions of the self-efficacy and exercise habits survey, an abbreviated version of the hispanic stress inventory-immigrant version and the latina values scale. the revised tools demonstrated acceptable validity and reliability. the adaptations improved the readability of the tools, resulting in a higher response rate, less missing data and fewer extreme responses. psychometric limitations to the adaptation of likert scales are discussed.
FORMULATION AND EVALUATION OF AMPHOTERICIN-B AS A LYOPHILIZED PRODUCT
Hitesh D. Karen
Journal of Global Pharma Technology , 2010, DOI: 10.1234/jgpt.v2i2.127
Abstract: The aim of this research work is to increase the solubility and stability of Amphotericin-B, which is widely used as antifungal agent. Since, Amphotericin-B is insoluble in water and also exhibits short stability if dispensed as tablet dosage form. Amphotericin-B lyophilized formulation was prepared by using sodium deoxycholic acid as a solubilizer, monobasic and dibasic sodium phosphate as a buffer, sodium hydroxide and phosphoric acid as a pH adjuster and water for injection as a vehicle. The lyophilization product was evaluated for pH, reconstitutional time, loss on drying, water content, color value, % light transmission, assay and relative substances. Based on the results it may be concluded that, these formulations were within USP limits and also exhibit high stability with increased solubility.
Lara Campbell, Respectable Citizens: Gender, Family and Unemployment in Ontario's Great Depression
Karen D. Hughes
The Canadian Journal of Sociology , 2010,
Abstract: Book Review
Improving the Security and Performance of the BaBar Detector Controls System
Karen D. Kotturi
Computer Science , 2003,
Abstract: It starts out innocently enough - users want to monitor Online data and so run their own copies of the detector control GUIs in their offices and at home. But over time, the number of processes making requests for values to display on GUIs, webpages and stripcharts can grow, and affect the performance of an Input/Output Controller (IOC) such that it is unable to respond to requests from requests critical to data-taking. At worst, an IOC can hang, its CPU having been allocated 100% to responding to network requests. For the BaBar Online Detector Control System, we were able to eliminate this problem and make great gains in security by moving all of the IOCs to a non-routed, virtual LAN and by enlisting a workstation with two network interface cards to act as the interface between the virtual LAN and the public BaBar network. On the interface machine, we run the Experimental Physics Industrial Control System (EPICS) Channel Access (CA) gateway software (originating from Advanced Photon Source). This software accepts as inputs, all the channels which are loaded into the EPICS databases on all the IOCs. It polls them to update its copy of the values. It answers requests from applications by sending them the currently cached value. We adopted the requirement that data-taking would be independent of the gateway, so that, in the event of a gateway failure, data-taking would be uninterrupted. In this way, we avoided introducing any new risk elements to data-taking. Security rules already in use by the IOC were propagated to the gateway's own security rules and the security of the IOCs themselves was improved by removing them from the public BaBar network.
Beware of the Dog: Traumatic Extrusion of an Artificial Urinary Sphincter Following Blunt Trauma to the Scrotum by a Domestic Animal  [PDF]
Michael S. Floyd jr., Karen Chan, Andrew D. Baird
Open Journal of Urology (OJU) , 2011, DOI: 10.4236/oju.2011.14020
Abstract: Artificial urinary sphincters are commonly used in males with intrinsic sphincter deficiency to improve continence and quality of life. Complications include erosion, mechanical failure and infection. Frequently, a staged approach involving removal of the device, followed by a period of healing and subsequent reinsertion of a new sphincter is required to restore continence. We describe the first case ever reported of traumatic sphincter extrusion following blunt scrotal trauma by a dog and review its clinical features and management.
The trade-offs of emotional reactivity for youths' social information processing in the context of maternal depression
Megan Flynn,Karen D. Rudolph
Frontiers in Integrative Neuroscience , 2012, DOI: 10.3389/fnint.2012.00043
Abstract: Although research demonstrates that emotional experiences can influence cognitive processing, little is known about individual differences in this association, particularly in youth. The present study examined how the emotional backdrop of the caregiving environment, as reflected in exposure to maternal depression and anxiety, was linked to biases in youths' cognitive processing of mother-referent information. Further, we investigated whether this association differed according to variation in youths' emotional reactivity to stress. Youth (50 boys, 46 girls; M age = 12.36, SD = 1.05) completed a behavioral task assessing cognitive bias. Semi-structured interviews were administered to assess (a) youths' emotional reactivity to naturally occurring stressors, and (b) maternal depression and anxiety. Hierarchical multiple regression analyses revealed that emotional reactivity to interpersonal stressors moderated the linkage between maternal depression and cognitive bias such that maternal depression predicted a greater negative bias in youth exhibiting high and average, but not low, levels of emotional reactivity. At low levels of maternal depression, youth with heightened interpersonal emotional reactivity showed a greater positive cognitive bias. This pattern of effects was specific to interpersonal (but not non-interpersonal) emotional reactivity and to maternal depression (but not anxiety). These findings illuminate one personal characteristic of youth that moderates emotion-cognition linkages, and reveal that emotional reactivity both enhances and impairs youths' cognitive processing as a function of socialization context.
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