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Jefferson Roma´ryo Duarte da Luz,Thayse Evellyn Silva do Nascimento,Leandro Vinicius Fernandes de Morais,Ana Katarina Menezes da Cruz,Adriana Augusto de Rezende,Jose Brandao Neto,Marcela Abbott Galvao 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.4
Cardiovascular and thromboembolic disturbances are the main causes of disease-related deaths worldwide. Regardless of the etiological factors involved in thrombus formation, coagulation is mainly activated by thrombin, one of the most important blood clotting molecules. Thus, this study evaluated the Turnera subulata leaf crude extract, its ethyl acetate fraction effect on the coagulation cascade, and its possible side effects. Their phytocomposition indicated polyphenols, mainly flavonol-3-O-glycosylate and a flavone glycoside, without in vitro and in vivo toxicity. Regarding their potential anticoagulants, results displayed partial thromboplastin and prothrombin time activation, and Xa and IIa, and thrombin inhibition by heparin II cofactor, indicating significant anticoagulant activity, suggesting direct and indirect thrombin inhibition as the main mechanism of action. Therefore, T. subulata leaf active compounds exhibit therapeutic potential required to develop phytotherapeutic formulations to assist conventional anticoagulants in clinical treatments.
Comfort and Infection Control of Chitosan-impregnated Cotton Gauze as Wound Dressing
Jefferson M. Souza,Mariana Henriques,Pilar Teixeira,Margarida M. Fernandes,Raul Fangueiro,Andrea Zille 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
The aim of this study was to evaluate the thermo-physiological comfort properties of surgical cotton gauze coatedwith chitosan (CH) and its effectiveness for the prevention of bacterial colonization. Gauze was coated with CH at massfractions of 0.50, 0.25, 0.125, 0.10, 0.063 wt% and the friction, flexibility, thermal, moisture management and mechanicalproperties were evaluated. The best performing gauze in terms of comfort (0.125 wt%) was further evaluated for its ability toinhibit the growth of microorganisms such as bacteria and yeast. Results indicate that the functionalized medical gauze couldinduce low friction on the wound bed allowing a good degree of moisture and high absorption capacity of wound exudates. Moreover, it shows antimicrobial properties against medical-relevant pathogens. This biofunctional medical gauzedemonstrates to deliver an efficient antimicrobial coating and promote the best conditions for maintenance of the woundmicroenvironment.
An Analysis of Household Rice and Noodle Consumption in the Philippines
Jefferson Amparo Arapoc 한국무역연구원 2014 The International Academy of Global Business and T Vol.10 No.2
By applying a Seemingly Unrelated Regression Model on Family Income and Expenditure Survey (FIES) data, the study examines the relationship of household rice and noodle consumption in the Philippines. Results show that noodles are already a substitute good for rice, but rice is not a substitute good for noodles. In addition, their respective demand exhibits negative relationship with their own prices and positive relationship with respect to household income which supports the idea that both rice and noodles are normal goods. A number of significant variables on the characteristics of household heads suggest the importance of household heads in determining consumption decisions. These include age, sex, marital status and educational attainment. Spouse employment is also found to negatively influence rice consumption. Lastly, the study also reveals that households in the urban area, particularly in Luzon, which is the biggest island in the Philippines, are most likely to have lower demand for rice as compared to their rural counterparts. Meanwhile, the opposite is true for noodle consumption.
Applications of Single-Molecule Methods to Membrane Protein Folding Studies
Jefferson, Robert E.,Min, Duyoung,Corin, Karolina,Wang, Jing Yang,Bowie, James U. Elsevier 2018 Journal of molecular biology Vol.430 No.4
<P><B>Abstract</B></P> <P>Protein folding is a fundamental life process with many implications throughout biology and medicine. Consequently, there have been enormous efforts to understand how proteins fold. Almost all of this effort has focused on water-soluble proteins, however, leaving membrane proteins largely wandering in the wilderness. The neglect has occurred not because membrane proteins are unimportant but rather because they present many theoretical and technical complications. Indeed, quantitative membrane protein folding studies are generally restricted to a handful of well-behaved proteins. Single-molecule methods may greatly alter this picture, however, because the ability to work at or near infinite dilution removes aggregation problems, one of the main technical challenges of membrane protein folding studies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single-molecule fluorescence applications to membrane protein folding </LI> <LI> Single-molecule fluorescence methods for measuring membrane protein oligomerization </LI> <LI> Atomic force spectroscopy of membrane protein extraction from bilayers </LI> <LI> Forced unfolding of membrane proteins using magnetic tweezers </LI> <LI> Unfolding of single membrane proteins <I>in vacuo</I> using mass spectroscopy </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
Thermal performance of a vapor chamber for electronic cooling applications
Jefferson Raja Bose,Nizar Ahammed,Lazarus Godson Asirvatham 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
The heat transfer performance of a vapor chamber and its effectiveness in the cooling of electronic devices are experimentally and theoretically investigated in the present work. The power transistor in the circuit board usually operates with electric power that ranges from 15 W to 100 W, which is the heat input to the simulated processor. The heat flux varies between 3300 and 22000 W/m 2 . The simulated processor is cooled with the forced and induced air cooling methods with and without the use of the vapor chamber. Results show a maximum temperature decrease of 26 % and a maximum increase in the convective heat transfer coefficient of 36 %. The minimum value of the thermal resistance through the vapor chamber and the total thermal resistance is 0.195 and 0.82 °C/W, respectively. The experimental results are compared with the ANSYS predicted values.
Three dimensional finite element simulations of fracture tests using the Craft concrete model
A.D. Jefferson,B.I.G. Barr,T. Bennett,S.C. Hee 한국계산역학회 2004 Computers and Concrete, An International Journal Vol.1 No.3
Two enhancements to a recently developed plastic-damage-contact model for concrete are presented. The model itself, which uses planes of degradation that can undergo damage and separation but that can regain contact according to a contact law, is described. The first enhancement is a new damage evolution function which provides a completely smooth transition from the undamaged to the damaged state and from pre-peak to post-peak regions. The second is an improved contact function that governs thepotential degree of contact with increasing opening on a crack plane. The use of a damage evolution function with a pre-peak has implications for the consistent tangent matrix/stress recovery algorithm developed for the model implementation, and amendments to this algorithm to accommodate the new function are described. A series of unpublished experimental tests on notched specimens undertaken in Cardiff in the mid 1990s are then described. These include notched beam tests as well as prismatic and cylindrical torsion tests. The tests are then considered in three dimensional finite element analyses using the modified Craft model implemented in the finite element program LUSAS. Comparisons between experimental and numerical data show reasonable agreement except that the numerical simulations do not fully describe the latter stages of the softening responses for the torsion examples. Finally, it is concluded that the torsion tests described provide useful benchmark examples for the validation of three-dimensional numerical models for concrete.