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Search Results: 1 - 10 of 331173 matches for " Daniela S. Toneva "
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Statistical Procedures for Finding Distribution Fits over Datasets with Applications in Biochemistry
Natalia D. Nikolova,Daniela S. Toneva,Ana-Maria K. Tenekedjieva
Bioautomation , 2009,
Abstract: A common problem in statistics is finding a distribution that fits to a certain dataset. Many theoretical distributions have been developed to give a good description of the empirical observations, and consequently, theory offers a variety of algorithms to test the quality of the resulting fits. It is reasonable to expect that each set of measurements should be described with the same theoretical distribution if one and the same experimental mechanism was applied. This paper presents procedures to find a theoretical distribution that best fits to several datasets. The procedure goes further, answering the questions of whether the given datasets come from the same general population, and assessing if the difference between the fitted distributions of two datasets are statistically significant. Kuiper test is used in all steps of the analysis. In two of those a Monte Carlo simulation procedure is elaborated to construct the Kuiper statistic's distribution. A platform with original program functions in MATLAB R2009a is created on the basis of the described procedures. It is applied to datasets from a biochemical experiment, which investigates the resulting density of fibrin network under different thrombin concentrations. The developed procedure has wide applications in different fields, as it models the behavior of datasets, generated through the same mechanism. The possibility to fit one type of distribution over different datasets allows comparing samples, performing interpolation and extrapolation procedures, and investigating the influence of the input conditions of an experiment over the parameters of the fitted distributions.
Integration through Generalized Sequences
Elena Toneva
Mathematics , 2011,
Abstract: The process of integration was a subject of significant development during the last century. Despite that the Lebesgue integral is complete and has many good properties, its inability to integrate all derivatives prompted the introduction of new approaches - Denjoy, Perron and others introduced new ways of integration aimed at preserving the good properties of the Lebesgue integral but extending the set of functions to which it could be applied. The goal was achieved but neither of the new approaches was elegant or simple or transparent. In the 50s a new integral was introduced, independently by Kurzweil and Henstock,in a very simple, Riemann like way, but it turned out that it was more powerful than the Lebesgue integral. There are many names attached to this integral, I will use here the name Henstock integral. The goal of this article is to introduce the generalized Riemann integral and the Lebesgue integral using generalized sequences.
Coping, Personality Traits and Social Support in Severe Burn Survivors  [PDF]
Priscilla M. P. Frota, Daniela S. Zanini
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.412154
Abstract:

Objective: The present study aimed at investigating the correlations among coping, personality traits, and social support for burn survivors. Method: Participants were 48 patients from a reference burn hospital who attended group meetings at a non-governmental organization associated to that institution that offers support to burn survivors. Data were collected from February to May, 2010. The participants answered a socio-demographic questionnaire and three instruments: Coping Strategy Indicator (CSI), Personality Markers, and Social Support Questionnaire (MOS Scale). Results: The data obtained showed a significant correlation among the personality traits neuroticism and socialization and social support, as well as between socialization and coping; however, differently than expected, no significant correlation was established between social support and coping. Conclusion: Personality traits are related to the perception of support from others; however the perception of support does not influence the way burn survivors cope with their problems. These data were discussed in order to broaden the knowledge and stimulate new studies on the area, so that, based on this information, more efficient treatment plans and interventions can be designed to fulfill both the physical and emotional needs of these survivors with more competency and perceptiveness.

A View from the Inside: Grounding the Remittance-Development Link
Villacrés, Daniela N.;
Migraciones internacionales , 2009,
Abstract: research on the remittance-development link and policies for leveraging remittances for development have led to polarization and have obscured vital nuances in the relationship. one school of thought has adopted an overly optimistic view, placing an exaggerated emphasis on maximizing remittances as viable development tools. the other has assumed an overly pessimistic position, dismissing remittances as economic crutches and ephemeral solutions to poverty. researchers have typically utilized quantitative methods that provide detached analyses. against that backdrop, this article uses evidence from one salvadoran municipality to provide an in-depth view of the remittance-development link at the local level, and it proposes four scenarios in which it manifests. findings counter overly simplistic and polarized depictions in the literature and expose how those who live the remittance-development link perceive and experience it first hand in their households and communities. this article draws conclusions about the development potential of family versus collective remittances, as well as the importance of a balanced understanding of remittance-driven development that must be considered when furthering research and formulating policy.
A View from the Inside: Grounding the Remittance-Development Link
Daniela N. Villacrés
Migraciones internacionales , 2009,
Abstract: La investigación y las políticas en torno al vínculo entre remesas y desarrollo han polarizado esta relación y, por ende, oscurecido importantes matices. Una corriente de opinión ha adoptado una posición optimista que destaca el potencial de las remesas como herramientas viables para el desarrollo. La otra, sin embargo, ha asumido una posición demasiado pesimista que rechaza las remesas por considerarlas un paliativo temporal a la pobreza y un impedimento para el desarrollo económico y social a largo plazo. Este artículo utiliza evidencia obtenida a través de estudios etnográficos y entrevistas en una municipalidad de El Salvador. Estos hallazgos contrarrestan las representaciones polarizadas y nos ofrecen un panorama detallado de los vínculos entre remesas y desarrollo local desde el punto de vista de quienes viven esta realidad en sus hogares y comunidades. Las conclusiones destacan el potencial de las remesas familiares versus las remesas colectivas en el contexto del desarrollo local, así como la importancia de contar con un entendimiento equilibrado al realizar investigaciones y formular políticas en esta materia.
Computed Tomographic Imaging of Vesicular Glands in Rabbits
R. Dimitrov,Y. Toneva,D. Vladova,K. Stamatova,M. Stefanov
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.55.59
Abstract: The study was carried out with the purpose to demonstrate the anatomo-topographic features of rabbit vesicular glands by computed axial tomography imaging (CT). Eight sexually matured, clinically healthy male white New Zealand rabbits, 12 months of age and weighing 2.8-3.2 kg were used. CT scans of the pelvis were performed in the transverse planes from the seventh Lumbar (L7) vertebra to the first Sacral vertebra (S1), with a section thickness of 2 mm. The cranial border of the vesicular glands was visualized in the transverse plane between L7 and S1 while the caudal part of the glands was observed in scans of the pelvic inlet in the transverse plane through the caudal part of S1. In the transverse scans of the pelvic inlet halfway S1, the vesicular glands appeared as transversely ovoid, homogeneous and relatively hypodense structures as compared to the adjacent soft tissues. The glandular areas were relatively hypodense compared to the urethral and rectal walls. The density of the rabbit vesicular glands was that of the soft tissues, ranging from 31±0.33 HU in precontrast imaging and 78±0.33 HU in postcontrast imaging.
Inundation Maps for Extreme Flood Events at the Mouth of the Danube River  [PDF]
Daniela E. Nistoran Gogoase, Iuliana Arma?, Cristina S. Ionescu
International Journal of Geosciences (IJG) , 2011, DOI: 10.4236/ijg.2011.21007
Abstract: Hydrodynamic modeling is used to analyse the inundation behavior of St. George village during extreme flood events, in particular for a flood happened in spring 2006. The study reach, 4 km in length, is situated in the Danube Delta, at the mouth of St. George distributary and includes St. George village. Land and bathymetric surveys were used to create a digital terrain model (DTM) of the river channel and the village. By coupling the geometry with hydrologic data, a 2D hydrodynamic model was built up with the help of the CCHE2D code (University of Mississippi). The model is based on integrating Saint-Venant shallow waters (depth averaged) equations through finite-difference implicit numerical scheme. It was calibrated in terms of roughness coefficients on measured values of water surface elevation registered in the St. George port. Flood maps obtained from computations were compared to satellite images from the same days of the spring 2006 extreme event. Inundation behaviour of the St. George village was analysed for different scenarios of river hydrological and sea level (variable because of wind waves) conditions. Findings were compared with high water marks and inhabitants testimonials. The model proved that sea level has a higher influence upon the inundability of the area than the river flood events.
Antioxidant Potential of Extracts from Processing Residues from Brazilian Food Industries  [PDF]
Natália Mezzomo, Daniela A. Oliveira, Sandra R. S. Ferreira
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.48A026
Abstract:

The objective of this work was to estimate the antioxidant potential of the extracts from pink shrimp residue and red grape pomaces (Merlot and Syrah varietals), evaluated according to its antioxidant activity with different analytical methods, associating these properties with the chemical composition of the extract and, as a consequence, with the extraction procedure. The shrimp residue was pre-treated combining cooking, drying, and milling, whereas the grape pomaces were dried and ground. The shrimp residue extracts were obtained by Soxhlet (SOX) and by maceration using hexane (Hx), hexane: isopropanol (50:50) (Hx:IPA), isopropanol, ethanol (EtOH) and acetone as solvents; by ultrasonic maceration (UME) with EtOH; by cold and hot oil extraction with soy and sunflower oils; and by Supercritical Fluid Extraction (SFE) with pure CO2 (100 - 300 bar; 313.15 - 333.15 K) and with co-solvent (Hx: IPA and sunflower oil at 2%). The grape pomaces extracts were obtained by SOX using EtOH, ethyl acetate (EtOAc) and Hx; UME with water (H2O), EtOH, EtOAc and Hx; and by SFE performed with pure CO2 (150 - 300 bar; 323.15 - 333.15 K) and with cosolvent (EtOH at 15%). The antioxidant activity was determined by the DPPH free radical scavenging procedure and by the β-carotene bleaching method. Higher antioxidant activities in shrimp residue extracts were observed by the β-carotene bleaching method in alcoholic and cetonic extracts, among the low pressure extraction methods, while for the SFE, the higher activities were achieved by the extracts obtained at elevated pressures. For the grape pomaces extracts, the best results were obtained by the DPPH method from the low pressure extractions proceeded with EtOH. The SFE with Merlot pomace at 323.15 K/150 bar (the lowest temperature and pressures tested) presented the best antioxidant activity by the β-carotene bleaching.

Personalidade e coping em pacientes com transtornos alimentares e obesidade
Tomaz, Renata;Zanini, Daniela S.;
Psicologia: Reflex?o e Crítica , 2009, DOI: 10.1590/S0102-79722009000300016
Abstract: this study assesses the differential use of coping and personality trait of patients with eating disorders (anorexia, bulimia, and eating disorders not otherwise specified - ednos), obesity as well as in subjects from the general population. 109 subjects participated in the study (60 with eating disorder or obesity diagnostics; 49 from the general population). the instruments were personality trait scale, coping response inventory and eating attitudes scale (eas). it was observed significant differences on eas according to the type of population, demonstrating this instrument's adequacy as psychopathological screening for eating disorders. moreover, individuals presenting high neuroticism and who discharge their emotion to cope with their problems have more inadequate eating attitudes as shown by eas (r=0.291, p=0.011). these results are discussed through theories related to the big five personality traits, coping, eating disorders and obesity.
Genetics and Epigenetics of the TET-ETS Translocation Network
Martin S. Staege and Daniela Max
Genetics & Epigenetics , 2012,
Abstract: In the present paper we review the translocation network involving TET and ETS family members with special focus on the Ewing family of tumors. FUS (fusion, involved in t(12;16) in malignant liposarcoma = TLS, Translocated in liposarcoma), EWSR1 (Ewing sarcoma breakpoint region 1) and TAF15 (TATA box-binding protein-associated factor, 68-KD) are the three human members of the TET family of RNA binding proteins. In addition, two EWSR1 pseudogenes are present in the human genome. TET family members are involved in several oncogenic gene fusions. Five of the 18 known fusion partners belong to the E26 (E twenty-six, ETS) family of transcription factors. Gene fusions between TET or ETS family members and other fusion partners link these gene fusions to a large network of oncogenic gene rearrangements.
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