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Search Results: 1 - 10 of 326674 matches for " Sabrina S. Jedlicka "
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Osteogenesis of MC3T3 Preosteoblasts on 3D Bioactive Peptide Modified Nano-Macroporous Bioactive Glass Scaffolds  [PDF]
Colin Przybylowski, Mohamed Ammar, Courtney LeBlon, Sabrina S. Jedlicka
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2015, DOI: 10.4236/jbnb.2015.63015
Abstract: Biointerface design that targets osteogenesis is a growing area of research with significant implications in biomedicine. Materials known to either support or stimulate osteogenesis are composed of a biomimetic ceramic material, such as bioactive glass. Bioactive glass is osteoproductive, and the potential for osteoproductivity can be enhanced by the addition of proteins or other additives designed to alter functionality. In addition, soluble growth factors are often added to osteogenic culture on bioactive glasses, further intensifying the effects of the material. In this paper, synthetic peptide combinations, covalently bound to a three-dimensional bioactive glass network, are used to mimic the effects of the whole fibronectin and bone morphogenetic proteins (BMP) 2 and 9. Peptide-silanes possessing critical binding sequences from each of these proteins are synthesized and used to decorate the surface of three-dimensional (3D) nano-macroporous bioactive glass. MC3T3 preosteoblast cells are then assessed for differentiation on the materials in the absence of soluble differentiation cues. MC3T3 preosteoblasts undergo enhanced differentiation on the peptide-silane samples over the standard nano-macroporous bioactive glass, and the differentiation capacity of the cells exposes only to peptide-silane surfaces approaches that of cells grown in chemical differentiation induction media.
Agroecología: promoviendo una transición hacia la sostenibilidad
S. R. Gliessman,F. J. Rosado-May,C. Guadarrama Zugasti,J. Jedlicka
Ecosistemas , 2007,
Abstract: Agroecología: promoviendo una transición hacia la sostenibilidad. En este artículo se define agroecología como la aplicación de los conceptos y prinicipios ecológicos al dise o y manejo de los sistemas alimentarios sostenibles. Se presentan los argumentos principales que sostienen la validez, importancia y pertinencia del enfoque agroecológico, no solo para entender los procesos involucrados en la producción de alimentos, sino para proponer alternativas que conduzcan a esos procesos para operar en sistemas sostenibles. El concepto clave, que guía el razonamiento metodológico y epistemológico en este análisis, es el de sostenibilidad. Para alcanzar sostenibilidad la metodología agroecológica no solo se ancla en la Ecología, lo cual se describe en el trabajo, sino que percibe la producción de alimentos como un proceso que involucra a los productores y consumidores interactuando en forma dinámica.
Analysis of Electromagnetics Forces on Magnetically Suspended High-Speed Trains
Daniel Mayer,Martin Jedlicka
Advances in Electrical and Electronic Engineering , 2004,
Abstract: High-speed superexpresses (HSST) developed by Japanese airlines (JAL) are based on the electrodynamics principle of magnetic suspension. The track contains short-circuited coils and interaction between them and superconductive coils in the vehicle produces its suspension. The paper includes a mathematical model for traction electrodynamics suspension device HSST represented by a system of linear differential equations with coefficients varying in time. Numerical analysis of this model fields the velocity-dependent lift and drag forces acting on the system. The time distribution of the lift force exhibits certain oscillations that may be suppressed by suitable placement of several superconductive levitation wings in the vehicle. The results obtained are in a good agreement with the knowledge found by various authors on prototype vehicles.
General Approach to Computation of Self- and Mutual Inductances of Iron-free Coils
Daniel Mayer,Martin Jedlicka
Advances in Electrical and Electronic Engineering , 2006,
Abstract: The paper discusses various ways of computation of self- and mutual inductance of massive iron-free coils. These inductances are expressed by a multiple definite integral whose calculation is realized by the Monte Carlo (MC) method. The theoretical analysis is illustrated by four numerical examples.
Growth-Promoting Role of the miR-106a~363 Cluster in Ewing Sarcoma
Layne Dylla, Paul Jedlicka
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0063032
Abstract: MicroRNAs (miRs) have been identified as potent regulators of both normal development and the hallmarks of cancer. Targeting of microRNAs has been shown to have preclinical promise, and select miR-based therapies are now in clinical trials. Ewing Sarcoma is a biologically aggressive pediatric cancer with little change in clinical outcomes despite improved chemotherapeutic regimens. There is a substantial need for new therapies to improve Ewing Sarcoma outcomes and to prevent chemotherapy-related secondary sequelae. Most Ewing Sarcoma tumors are driven by the EWS/Fli-1 fusion oncoprotein, acting as a gain-of-function transcription factor causing dysregulation of a variety of targets, including microRNAs. Our previous studies, and those of others, have identified upregulation of miRs belonging to the related miR-17~92a, miR-106b~25, and miR-106a~363 clusters in Ewing Sarcoma. However, the functional consequences of this have not been characterized, nor has miR blockade been explored as an anti-cancer strategy in Ewing Sarcoma. To simulate a potential therapeutic approach, we examined the effects of blockade of these clusters, and their component miRs. Using colony formation as a read-out, we find that blockade of selected individual cluster component miRs, using specific inhibitors, has little or no effect. Combinatorial inhibition using miR “sponge” methodology, on the other hand, is inhibitory to colony formation, with blockade of whole clusters generally more effective than blockade of miR families. We show that a miR-blocking sponge directed against the poorly characterized miR-106a~363 cluster is a particularly potent inhibitor of clonogenic growth in a subset of Ewing Sarcoma cell lines. We further identify upregulation of miR-15a as a downstream mechanism contributing to the miR-106a~363 sponge growth-inhibitory effect. Taken together, our studies provide support for a pro-oncogenic role of the miR-106a~363 cluster in Ewing Sarcoma, and identify miR-106a~363 blockade, as well as miR-15a replacement, as possible strategies for inhibition of Ewing Sarcoma growth.
MicroRNAs in Ewing Sarcoma
Colin Moore,Paul Jedlicka
Frontiers in Oncology , 2013, DOI: 10.3389/fonc.2013.00065
Abstract: MicroRNAs (miRs) have emerged recently as important regulators of gene expression in the cell. Frequently dysregulated in cancer, miRs have shed new light on molecular mechanisms of oncogenesis, and have generated substantial interest as biomarkers, and novel therapeutic agents and targets. Recently, a number of studies have examined miR biology in Ewing sarcoma. Findings indicate that alterations in miR expression in Ewing Sarcoma are widespread, involve both EWS/Ets oncogenic fusion-dependent and independent mechanisms, and contribute to malignant phenotypes. miRs with prognostic potential have been identified, and several preclinical studies suggest that miR manipulation could be therapeutically useful in this aggressive disease. These and future studies of miR biology stand to expand our understanding of Ewing sarcoma pathogenesis, and may identify new biomarkers and treatment options.
Human Resources Information System (HRIS): A Theoretical Perspective  [PDF]
Sabrina Sabrina Jahan
Journal of Human Resource and Sustainability Studies (JHRSS) , 2014, DOI: 10.4236/jhrss.2014.22004
Abstract: HRIS is one of the major modern HR tools. In developed countries, it became popular since the be-ginning of this century. In Bangladesh, corporate organizations have started to implement HRIS in last 5 years. But still its implementation is limited within the big corporate houses. Small corporate houses and public organizations have failed to realize the benefits of HRIS and taken hardly any initiative to implement the system. The major barrier to success of HRIS is the lack of management commitment. The major limitation is the high cost. But the benefits of the HRIS are more than the limitations. Once it is implemented in any organization, employees and management have accepted and realized the benefits. But to get it implemented is a challenge. This study is an attempt to provide a theoretical analysis of the HRIS implementation with analysis of benefits, limitations and barriers. A case study was prepared to provide a better understanding of the topic in a real life context.
Performa Ayam dan Kualitas Telur yang Menggunakan Ransum Mengandung Onggok Fermentasi dengan Neurospora crassa
Nuraini,Sabrina,S. A. Latif
Media Peternakan , 2008,
Abstract: An experiment was conducted to determine the effect of feeding tapioca by-products fermented by Neurospora crassa on layer performances and egg quality. Two hundred layers were randomly allocated into 20 pens. This experiment was arranged in a completely randomized design with four dietary treatments: 0%, 10%, 20% and 30% tapioca by product fermented by N. crassa in the diets and five replications. Variable measured were feed comsumption, egg production, feed conversion, egg cholesterol and egg yolk colour. Results of the experiment indicated that feed comsumption, egg production, feed conversion, egg cholesterol and egg yolk colour were affected (P<0.05) by using fermented tapioca by-product in the diets of layers. Results of Duncan multiple range test indicated that feed consumption, egg production, and egg yolk colour in D treatment (used 30% tapioca by-products fermented) were the highest compared to those other treatments, but the lowest on feed conversion and egg cholesterol. The conclusion of the experiment that tapioca by-products fermented by N. crassa can be used up to 30% in the diet of layer.
Evaluation of Durability Conferred by an Oleothermic Treatment on Chestnut and Douglas fir through Laboratory and in Field Tests  [PDF]
Sabrina Palanti
Open Journal of Forestry (OJF) , 2013, DOI: 10.4236/ojf.2013.32011
Abstract:

The research evaluated two wood species, chestnut and Douglas fir, that are widespread in Tuscany, treated with an oleothermicprocess. Efficacy of this treatment against fungal decay was assessed through laboratory and field tests. The aim of this research was to investigate if an oleothermic process could add value to these natural resources when utilized in Use Class 4 (EN 335) for agricultural purposes such as vineyard poles. The treatment was effective on sapwood of both wood species in laboratory test, giving a protection similar to the untreated heartwood but in case of chestnut, it was easily washed away. In field test the leaching during the outdoor exposure reduced the resistance to fungal decay in both species.

 

Pesquisa qualitativa, cartografia e saúde: conex?es
Ferigato, Sabrina Helena;Carvalho, Sérgio Resende;
Interface - Comunica??o, Saúde, Educa??o , 2011, DOI: 10.1590/S1414-32832011005000037
Abstract: in this literature review study, we sought to explore the frontiers between the production of healthcare knowledge, qualitative research and cartography. we started with a brief retrospective look at the historical construction of qualitative research in general, followed by presentation of cartographic investigation as a possible method for qualitative healthcare research. after presenting the conceptual basis of this method for knowledge production, we identified its potential and challenges with regard to developing research within the field of public health.
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