20 results on '"Loyola L"'
Search Results
2. Synthetic stochastic ground motions compatible with the Chilean seismic hazard
- Author
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Loyola, L., Rojas, F., and Ruiz, R.O.
- Published
- 2021
- Full Text
- View/download PDF
3. HERRAMIENTA MULTICRITERIO BASADA EN FUNCIONALIDADES SIG PARA LA IDENTIFICACIÓN POTENCIAL DE ÁREAS DE RIEGO EN ARGENTINA
- Author
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Hidalgo García, M., Loyola, L., López, C., Zunino, F., Valle Vila, B., San Sebastián Sauto, J., Hierro Rodríguez, R., Hidalgo García, M., Loyola, L., López, C., Zunino, F., Valle Vila, B., San Sebastián Sauto, J., and Hierro Rodríguez, R.
- Abstract
[EN] In 2014 FAO ordered Tragsatec the design and development of a decision making tool for locating potential areas to be put under irrigation in Argentina. During the first phase, there was a proposal of some goals and indicators based on the sustainability of 5 key issues (technical-agronomic, environmental, economic, social and institutional). After the collection of maps, tables and studies sent from Argentina, these data were treated to be used as a material capable of establishing a prioritization for the development of irrigation based on a potential rate of irrigation (IPR). This rate is a number between 0 and 1 which has been used to set a common legend as much for the source raster layers as for the resulting maps. Once the tool functionality in an Arcmap interface was checked, all 5 thematic layer crosses were carried on to assess the relevance of the results. Subsequently, multi-criteria combinations were tested too. To conclude, a series of conclusions and recommendations on the use of a multiparameter computer tool for irrigation planning are anticipated., [ES] La FAO encargó a Tragsatec el diseño y desarrollo de una herramienta para la identificación de áreas potenciales de riego en Argentina en noviembre de 2013. En una primera fase se propusieron objetivos e indicadores basados en la sostenibilidad de 5 bloques temáticos (técnico-agronómico, ambiental, económico, social e institucional). Tras la recopilación de mapas, tablas y estudios enviados desde Argentina, estos datos se trataron para su uso como material capaz de establecer una priorización para la puesta en riego basado en un índice potencial de riego (IPR). Este IPR es un número entre 0 y 1 que se ha utilizado para establecer una leyenda común tanto para capas raster originales como a resultados. Una vez establecida la funcionalidad de la herramienta en un entorno Arcmap se realizaron los 5 cruces temáticos para valorar la pertinencia de los resultados. Posteriormente, se probaron combinaciones multicriterio. Se plantean una serie de conclusiones y recomendaciones sobre el uso de una herramienta informática multiparamétrica para la planificación de regadío.
- Published
- 2015
4. A Visited Item Frequency Based Recommender System: Experimental Evaluation and Scenario Description
- Author
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Konow, R., Tan, W., Loyola, L., Pereira, J., and Nelson Baloian
- Subjects
recommender system ,collaborative filtering ,TF-IDF ,e-content ,FMeasure ,advertising ,clustering - Abstract
There has been a continuous development of new clustering and prediction techniques that help customers select products that meet their preferences and/or needs from an overwhelming amount of available choices. Because of the possible huge amount of available data, existing Recommender Systems showing good results might be difficult to implement and may require a lot of computational resources to perform in this scenario. In this paper, we present a more simple recommender system than the traditional ones, easy to implement, and requiring a reasonable amount of resources to perform. This system clusters users according to the frequency an item has been visited by users belonging to the same cluster, performing a collaborative filtering scheme. Experiments were conducted to evaluate the accuracy of this method using the Movielens dataset. Results obtained, as measured by the F-measure value, are comparable to other approaches found in the literature which are far more complex to implement. Following this, we explain the application of this system to an e-content site scenario for advertising. In this context, a filtering tool is shown which has been developed to filter and contextualize recommended items.
- Published
- 2011
5. EVALUACIÓN DEL CONTENIDO DE ALMIDON EN PAPAS (SOLANUM TUBEROSUM CV. DESIRÉE), PRODUCIDAS EN FORMA ORGÁNICA Y CONVENCIONAL, EN LA PROVINCIA DE CURICÓ, REGIÓN DEL MAULE
- Author
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Loyola L, Nelson, Oyarce C, Eduardo, and Acuña C, Carlos
- Subjects
sp Tuberosum ,cultivo orgánico ,cultivo convencional ,composición química ,organic cultivation ,sensory evaluation ,chemical composition ,conventional cultivation ,Solanum tuberosum ,evaluación sensorial - Abstract
Se evaluó la composición química de tubérculos de papas (Solanum tuberosum, sp Tuberosum) cv. Desirée, producidos bajo dos formas de cultivo convencional y orgánico; los componentes evaluados fueron: contenido de materia seca, almidón, proteínas, azúcares totales y azúcares reductores. Se usó un diseño completamente al azar y análisis de varianza con un 95% de exigencia para ver si existían diferencias estadísticas. El estudio concluyó en que no existieron diferencias significativas en los parámetros evaluados, bajo las dos formas de cultivo. También se realizaron evaluaciones sensoriales de papas fritas con tubérculos producidos en forma convencional y orgánica, a los 30 y 75 días de postcosecha, participando 13 panelistas entrenados, quienes evaluaron los atributos de: color, textura y sabor. Para expresar los resultados se utilizaron gráficos del tipo radial, no encontrándose diferencias marcadas a favor de un tipo de papas, luego de freírlas, independiente del tipo de cultivo realizado, de acuerdo a los atributos evaluados. Chemical composition of potato tubers (Solanum tuberosum, sp. tuberosum) cv. Desirée was evaluated after two production alternatives; conventional and organic, and the components were: dry matter content, starch, proteins, total and reducing sugars. A total randomized design was used and the values were measured by the anova with a 95% of probability. There were no significant differences among the parameters evaluated under the two cultivation alternatives. Sensory evaluation with fried potato were also realized by using tubers from the two cultivation alternatives, conventional and organic, at 30 days and 75 days after harvest. Thirteen trained panelist participated, who evaluated the following attributes; color, texture and flavor. According to the panelist there were no differences in relation to any kind of potato tubers, after fried, whatever the cultivation alternatives, in relation to the sensory attributes.
- Published
- 2010
6. EVALUACIÓN DEL CONTENIDO DE ALMIDON EN PAPAS (SOLANUM TUBEROSUM CV. DESIRÉE), PRODUCIDAS EN FORMA ORGÁNICA Y CONVENCIONAL, EN LA PROVINCIA DE CURICÓ, REGIÓN DEL MAULE
- Author
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Nelson Loyola L, Eduardo Oyarce C, and Carlos Acuña C
- Subjects
sp Tuberosum ,cultivo orgánico ,cultivo convencional ,composición química ,General Agricultural and Biological Sciences ,Agronomy and Crop Science ,Solanum tuberosum ,evaluación sensorial - Abstract
Se evaluó la composición química de tubérculos de papas (Solanum tuberosum, sp Tuberosum) cv. Desirée, producidos bajo dos formas de cultivo convencional y orgánico; los componentes evaluados fueron: contenido de materia seca, almidón, proteínas, azúcares totales y azúcares reductores. Se usó un diseño completamente al azar y análisis de varianza con un 95% de exigencia para ver si existían diferencias estadísticas. El estudio concluyó en que no existieron diferencias significativas en los parámetros evaluados, bajo las dos formas de cultivo. También se realizaron evaluaciones sensoriales de papas fritas con tubérculos producidos en forma convencional y orgánica, a los 30 y 75 días de postcosecha, participando 13 panelistas entrenados, quienes evaluaron los atributos de: color, textura y sabor. Para expresar los resultados se utilizaron gráficos del tipo radial, no encontrándose diferencias marcadas a favor de un tipo de papas, luego de freírlas, independiente del tipo de cultivo realizado, de acuerdo a los atributos evaluados.
- Published
- 2010
- Full Text
- View/download PDF
7. USO DE BOROCAL® EN PRECOSECHA Y SACAROSA EN POSTCOSECHA EN VARAS DE CORTE DE PEONÍA (Paeonia lactifora P.) CV. ‘KARL ROSENFIELD’
- Author
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Loyola L, N., Prieto, L. C., and Villouta, M. B.
- Abstract
La familia Paeoniaceae tiene una amplia distribución mundial, encontrándose en áreas desde el noroeste de Norteamérica al norte de África, oeste y centro de Europa y medioeste de Rusia, China, Pakistán y norte de la India. Según la clasificación utilizada, el género Paeonia tiene 30 a 42 especies entre las plantas herbáceas y arbustivas. En flores de corte, deben existir objetivos claros en cuanto a la exportación, por lo tanto, es fundamental tener un manejo adecuado de postcosecha, que permita mantener las flores por el mayor tiempo posible en condiciones óptimas, tanto durante el transporte como su condición de vida en el forero, existiendo en Chile muy poco conocimiento sobre este manejo. Con la finalidad de solucionar estas dudas, se realizó un ensayo para evaluar el comportamiento de la vida en postcosecha de Peonía (Paeonia lactifora P.) cultivar ‘Karl Rosenfield’, utilizando cuatro tratamientos, entre los cuales a algunos se les adicionó el producto comercial en precosecha denominado Borocal® y sacarosa aplicado en postcosecha; evaluando cuatro parámetros de calidad en flores de corte: Diámetro floral, curvatura de varas, peso de varas y vida en forero. Este ensayo se evaluó durante 25 días, que fue el tiempo total de almacenamiento refrigerado. Los resultados arrojaron que las varas de peonías que tuvieron la aplicación de Borocal® en precosecha y sólo agua en postcosecha (T1), alcanzaron los valores más altos en cuanto a diámetro floral, peso de varas y en particular una mayor vida en el forero; no existiendo diferencias significativas en la curvatura de las varas.  
- Published
- 2007
8. COMPORTAMIENTO EN POST COSECHA Y ALMACENAMIENTO EN FRÍO DE LISIANTHUS (Eustoma grandiforum)
- Author
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Loyola L., N., Llanca, M., A., and Carrasco L., C.
- Abstract
Se realizó un estudio para observar el comportamiento en almacenamiento refrigerado; bajo condiciones constantes de 2°C y 95% de humedad relativa (HR), más el uso de conservantes de pre y post cosecha; de la especie ornamental Lisianthus (Eustoma grandiforum Shinn). El cultivo se llevó a cabo en la localidad de Teno; latitud Sur 35°12`, longitud Oeste 70°31`. Para la evaluación de la vida post cosecha de Lisianthus, se escogieron 4 parámetros: peso de varas, medido mediante una balanza de precisión, apertura floral y senescencia de flores; realizada visualmente, más el diámetro del botón; evaluado con pie de metro. El estudio se basó en un diseño experimental de bloques completos al azar, con una unidad experimental de un contenedor con 10 flores y tuvo una duración de diez días. El producto aplicado antes de cosecha fue en base a sales de Cobalto y Molibdeno (COMO®), fertilizante que inhibe la producción de etileno, retrasando la maduración. Este producto fue evaluado en tres dosis distintas: 1 cc L- agua y 4 cc L-¹ agua. Del producto de post cosecha, un conocido antioxidante, el cual fue ácido cítrico, evaluado en tres dosis distintas: 0,15 g L-¹ agua; 0,3 g L-¹ agua y 0,4g L-¹ agua. Se recomienda, bajo condiciones del ensayo de 2°C y 95% HR, una dosis media a alta de COMO® de 2 a 4 cc L-¹ agua, aplicada 1 semana antes de la cosecha, más una dosis media de ácido cítrico en post cosecha de 0,3 g L-¹ agua, obteniendo una mejor calidad de la vara floral, expresada en los parámetros evaluados.  
- Published
- 2007
9. COMPORTAMIENTO EN POST COSECHA Y ALMACENAMIENTO EN FRÍO DE LISIANTHUS (Eustoma grandiforum)
- Author
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N. Loyola L., C. Carrasco L., and A. Llanca M.
- Subjects
Ocean Engineering - Published
- 2007
- Full Text
- View/download PDF
10. USO DE BOROCAL® EN PRECOSECHA Y SACAROSA EN POSTCOSECHA EN VARAS DE CORTE DE PEONÍA (Paeonia lactifora P.) CV. ‘KARL ROSENFIELD’
- Author
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N. Loyola L., C. Prieto L., and B. Villouta M.
- Subjects
Ocean Engineering - Published
- 2007
- Full Text
- View/download PDF
11. An architecture to support the design and evaluation of software platforms for partially virtual communities
- Author
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Gutierrez, F. J., Ochoa, S. F., Baloian, N., Gustavo Zurita, Loyola, L., Fondecyt Project (Chile), Grant: 1150252, the LACCIR Project, Grant: R1210LAC002, Facultad de Economía y Negocios de la Universidad de Chile, and Ph.D. Scholarship Program of Conicyt Chile (CONICYT-PCHA/Doctorado Nacional/2013-21130075)
- Subjects
Social system architecture, design guideline, evaluation instrument, partially virtual communities - Abstract
Several researchers have identified the design of collaborative systems as a particularly challenging task, because it has to consider services that are not easily identifiable by software designers. The systems that support the activities of partially virtual communities (PVC) are not an exception. Typically, designers of PVC supporting systems are able to identify services that have a visual representation on the user interface, but they usually overlook those that run in the system back-end. In an attempt to help designers to consider these two types of services, this article proposes a software architecture that can be used for both, designing new PVC supporting systems and evaluating existing ones. The architecture was used in three case studies as a design guideline during the development of PVC supporting platforms, and also as an instrument to evaluate three commercial systems. Although the obtained results are still preliminary, they indicate that the architecture is able to accomplish both roles.
12. Paniculatine. A New Alkaloid from L. paniculatum Desvaux
- Author
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Castillo, M., primary, Morales, G., additional, Loyola, L. A., additional, Singh, I., additional, Calvo, C., additional, Holland, H. L., additional, and MacLean, D. B., additional
- Published
- 1975
- Full Text
- View/download PDF
13. Operationalising the Family-Friendly Medical Workplace and the Development of FAM-MED, a Family-Friendly Self-Audit Tool for Medical Systems: A Delphi Consensus.
- Author
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Peisah C, Sheppard A, Benbow SM, Loughran-Fowlds A, Grayson S, Gunton JE, Kataria A, Lai R, Lele K, Quadrio C, Wright D, and McLean L
- Abstract
Globally, the call for Family-Friendly (FF) workplaces is loud and clear. However, this call is inaudible in medical workplaces, despite both well-established benefits of FF workplaces across businesses and well-known effects of work-family conflict on the well-being and practice of doctors. We aimed to use the Delphi consensus methodology to: (i) operationalise the Family-Friendly medical workplace and (ii) develop a Family-Friendly Self-Audit tool for medical workplaces. The expert medical Delphi panel was deliberatively recruited to capture a breadth of professional, personal, and academic expertise, diversity of age (35-81), life stage, family contexts and lived experience of dual commitments to work and family, and diversity of work settings and positions. Results reflected the inclusive and dynamic nature of the doctor's family and the need to adopt a family life cycle approach to FF medical workplaces. Key processes for implementation include holding firms to zero discrimination; flexibility and openness to dialogue and feedback; and a mutual commitment between the doctor and the department lead to best meet the doctor's individualised needs while still ensuring optimal patient care and team support and cohesion. We hypothesise that the Department Head may be the key to implementation but recognise the workforce constraints to realising these aspirational systemic shifts. It is time we acknowledge that doctors have families, to narrow the gap between identifying as a partner, mother, father, daughter, son, grandparent, and identifying as a doctor. We affirm the right to be both good doctors and good family members.
- Published
- 2023
- Full Text
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14. Elevation of Pulmonary Artery Pressure in Newborns from High-Altitude Pregnancies Complicated by Preeclampsia.
- Author
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Salinas-Salmon CE, Murillo-Jauregui C, Gonzales-Isidro M, Espinoza-Pinto V, Mendoza SV, Ruiz R, Vargas R, Perez Y, Montaño J, Toledo L, Badner A, Jimenez J, Peñaranda J, Romero C, Aguilar M, Riveros-Gonzales L, Arana I, and Villamor E
- Abstract
We hypothesized that fetal exposure to the oxidative stress induced by the combined challenge of preeclampsia (PE) and high altitude would induce a significant impairment in the development of pulmonary circulation. We conducted a prospective study in La Paz (Bolivia, mean altitude 3625 m) in which newborns from singleton pregnancies with and without PE were compared (PE group n = 69, control n = 70). We conducted an echocardiographic study in these infants at the median age of two days. The percentage of cesarean deliveries and small for gestational age (SGA) infants was significantly higher in the PE group. Heart rate, respiratory rate, and oxygen saturation did not vary significantly between groups. Estimated pulmonary arterial pressure and pulmonary vascular resistance were 30% higher in newborns exposed to PE and high altitude compared with those exposed only to high altitude. We also detected signs of right ventricular hypertrophy in infants subjected to both exposures. In conclusion, this study provides evidence that the combination of PE and pregnancy at high altitude induces subclinical alterations in the pulmonary circulation of the newborn. Follow-up of this cohort may provide us with valuable information on the potential increased susceptibility to developing pulmonary hypertension or other pulmonary and cardiovascular disorders.
- Published
- 2023
- Full Text
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15. A comparison of fraud to fund gambling with fraud for other reasons.
- Author
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Dougherty E, Staples L, McLean L, Machart T, Westmore B, and Nielssen O
- Abstract
In order to compare the characteristics, including diagnosed mental disorder, of people who commit fraud offences to fund gambling with those who committed fraud for other reasons, we examined a complete series of reports prepared for legal proceedings by two of the authors from between January 2002 and June 2019. A total of 160 fraud offenders were located, of whom 48 (30%) reported offending to fund gambling. Females made up 47.5% of the total sample and 43.8% of the gamblers. Of the problem gambling group, 44% had diagnoses of anxiety or depression, 44% had substance use disorder, 17% had bipolar and other psychosis, and 38% reported childhood trauma. There were no significant differences in the frequencies of diagnosis of mental illness or previous criminal convictions compared to the non-gambling group. Two thirds reported only gambling on poker machines. Only 19% of gamblers reported seeking treatment prior to being charged., (© 2020 The Australian and New Zealand Association of Psychiatry, Psychology and Law.)
- Published
- 2020
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16. Disrupting MLV integrase:BET protein interaction biases integration into quiescent chromatin and delays but does not eliminate tumor activation in a MYC/Runx2 mouse model.
- Author
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Loyola L, Achuthan V, Gilroy K, Borland G, Kilbey A, Mackay N, Bell M, Hay J, Aiyer S, Fingerman D, Villanueva RA, Cameron E, Kozak CA, Engelman AN, Neil J, and Roth MJ
- Subjects
- Animals, Chromatin, Core Binding Factor Alpha 1 Subunit genetics, Disease Models, Animal, Genes, myc, Humans, Integrases metabolism, K562 Cells, Leukemia Virus, Murine genetics, Mice, Mice, Transgenic, Virus Integration, Carcinogenesis, Genetic Vectors toxicity, Leukemia, Experimental, Retroviridae Infections, Tumor Virus Infections
- Abstract
Murine leukemia virus (MLV) integrase (IN) lacking the C-terminal tail peptide (TP) loses its interaction with the host bromodomain and extraterminal (BET) proteins and displays decreased integration at promoter/enhancers and transcriptional start sites/CpG islands. MLV lacking the IN TP via an altered open reading frame was used to infect tumorigenesis mouse model (MYC/Runx2) animals to observe integration patterns and phenotypic effects, but viral passage resulted in the restoration of the IN TP through small deletions. Mice subsequently infected with an MLV IN lacking the TP coding sequence (TP-) showed an improved median survival by 15 days compared to wild type (WT) MLV infection. Recombination with polytropic endogenous retrovirus (ERV), Pmv20, was identified in seven mice displaying both fast and slow tumorigenesis, highlighting the strong selection within the mouse to maintain the full-length IN protein. Mapping the genomic locations of MLV in tumors from an infected mouse with no observed recombination with ERVs, TP-16, showed fewer integrations at TSS and CpG islands, compared to integrations observed in WT tumors. However, this mouse succumbed to the tumor in relatively rapid fashion (34 days). Analysis of the top copy number integrants in the TP-16 tumor revealed their proximity to known MLV common insertion site genes while maintaining the MLV IN TP- genotype. Furthermore, integration mapping in K562 cells revealed an insertion preference of MLV IN TP- within chromatin profile states associated with weakly transcribed heterochromatin with fewer integrations at histone marks associated with BET proteins (H3K4me1/2/3, and H3K27Ac). While MLV IN TP- showed a decreased overall rate of tumorigenesis compared to WT virus in the MYC/Runx2 model, MLV integration still occurred at regions associated with oncogenic driver genes independently from the influence of BET proteins, either stochastically or through trans-complementation by functional endogenous Gag-Pol protein., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2019
- Full Text
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17. The Efficacy of Eye Movement Desensitization and Reprocessing in Children and Adults Who Have Experienced Complex Childhood Trauma: A Systematic Review of Randomized Controlled Trials.
- Author
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Chen R, Gillespie A, Zhao Y, Xi Y, Ren Y, and McLean L
- Abstract
Background: Survivors of complex childhood trauma (CT) such as sexual abuse show poorer outcomes compared to single event trauma survivors. A growing number of studies investigate Eye Movement Desensitization and Reprocessing (EMDR) treatment for posttraumatic stress disorder (PTSD), but no systematic reviews have focused on EMDR treatment for CT as an intervention for both adults and children. This study therefore systematically reviewed all randomized controlled trials (RCTs) evaluating the effect of EMDR on PTSD symptoms in adults and children exposed to CT. Methods: Databases including PubMed, Web of Science, and PsycINFO were searched in October 2017. Randomized controlled trials which recruited adult and children with experience of CT, which compared EMDR to alternative treatments or control conditions, and which measured PTSD symptoms were included. Study methodology quality was evaluated with Platinum Standard scale. Results: Six eligible RCTs of 251 participants were included in this systematic review. The results indicated that EMDR was associated with reductions in PTSD symptoms, depression and/or anxiety both post-treatment and at follow-up compared with all other alternative therapies (cognitive behavior therapy, individual/group therapy and fluoxetine) and control treatment (pill placebo, active listening, EMDR delayed treatment, and treatment as usual). However, studies suffered from significant heterogeneity in study populations, length of EMDR treatment, length of follow-up, comparison groups, and outcome measures. One study had a high risk of bias. Discussion: This systematic review suggests that there is growing evidence to support the clinical efficacy of EMDR in treating CT in both children and adults. However, conclusions are limited by the small number of heterogenous trials. Further RCTs with standardized methodologies, as well as studies addressing real world challenges in treating CT are required.
- Published
- 2018
- Full Text
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18. To BD or not to BD: functional neuroimaging and the boundaries of bipolarity.
- Author
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Kuiper S, McLean L, and Malhi GS
- Subjects
- Diagnosis, Differential, Humans, Neural Pathways pathology, Psychiatric Status Rating Scales, Bipolar Disorder diagnosis, Brain pathology, Functional Neuroimaging methods
- Abstract
Bipolar disorders are major mood disorders defined by the presence of discrete episodes of depression and either mania, in bipolar I disorder, or hypomania, in bipolar II disorder. There is little contention that both are serious psychiatric conditions or that they are associated with substantial suffering, disability, risk of suicide and cost to the community. Recently, focus has shifted away from classic manic-depressive illness toward a 'bipolar spectrum' model, which allows for much softer presentations to be conceptualized as bipolarity, but the boundaries of this concept remain contentious. In this article, we will consider the contribution of neuroimaging to delineating the bipolar phenotype and differentiating it from similar disorders.
- Published
- 2013
- Full Text
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19. NMR indicates that the small molecule RITA does not block p53-MDM2 binding in vitro.
- Author
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Krajewski M, Ozdowy P, D'Silva L, Rothweiler U, and Holak TA
- Subjects
- Amino Acid Sequence, Binding Sites, Chromatography, Affinity, Diffusion, Gene Deletion, Glutathione Transferase metabolism, Histidine chemistry, Humans, Kinetics, Nitrogen Isotopes metabolism, Protein Binding, Protein Conformation, Protein Folding, Protein Structure, Tertiary, Proto-Oncogene Proteins c-mdm2 chemistry, Protons, Recombinant Fusion Proteins metabolism, Spectrometry, Fluorescence, Titrimetry, Tumor Suppressor Protein p53 chemistry, Tumor Suppressor Protein p53 genetics, Tumor Suppressor Protein p53 isolation & purification, DNA-Binding Proteins metabolism, Neoplasm Proteins metabolism, Nuclear Magnetic Resonance, Biomolecular, Proto-Oncogene Proteins c-mdm2 metabolism, Tumor Suppressor Protein p53 metabolism
- Published
- 2005
- Full Text
- View/download PDF
20. NMR structural characterization and computational predictions of the major intermediate in oxidative folding of leech carboxypeptidase inhibitor.
- Author
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Arolas JL, D'Silva L, Popowicz GM, Aviles FX, Holak TA, and Ventura S
- Subjects
- Animals, Computational Biology, Computer Simulation, Magnetic Resonance Spectroscopy, Oxidation-Reduction, Protein Structure, Secondary, Protein Structure, Tertiary, Proteins metabolism, Hirudo medicinalis metabolism, Models, Biological, Models, Chemical, Protein Folding, Proteins chemistry
- Abstract
The III-A intermediate constitutes the major rate-determining step in the oxidative folding of leech carboxypeptidase inhibitor (LCI). In this work, III-A has been directly purified from the folding reaction and structurally characterized by NMR spectroscopy. This species, containing three native disulfides, displays a highly native-like structure; however, it lacks some secondary structure elements, making it more flexible than native LCI. III-A represents a structurally determined example of a disulfide-insecure intermediate; direct oxidation of this species to the fully native protein seems to be restricted by the burial of its two free cysteine residues inside a native-like structure. We also show that theoretical approaches based on topological constraints predict with good accuracy the presence of this folding intermediate. Overall, the derived results suggest that, as it occurs with non-disulfide bonded proteins, native-like interactions between segments of secondary structure rather than the crosslinking of disulfide bonds direct the folding of LCI.
- Published
- 2005
- Full Text
- View/download PDF
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