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Lumped-intermediates analysis in the photooxidation of Rhodamine 6G in the H_2O_2/UV system
Amaia Menendez,Jose I. Lombraña,Ana de Luis 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
The combination of H_2O_2 with UV radiation was applied to study the degradation of Rhodamine 6G dye (Rh-6G). The lumped kinetic model proposed in this work is a reaction-system scheme to describe the degradation of dye using lumps of intermediate compounds grouped by their chemical and colorimetric behavior. Rate constants obtained by application of the model were shown to predict the progress of dye oxidation. The effects of pH and oxidant dosage on these rate constants were also analyzed. Finally, photodecoloration was studied considering the absorption at 528 nm (the maximum absorption wavelength of the dye) as the sum of all compounds absorbing at this wavelength:Rhodamine itself and the colored intermediates produced.
Patient Satisfaction in Spine Surgery: A Systematic Review of the Literature
Joshua York Menendez,Nidal Bassam Omar,Gustavo Chagoya,Borna Ethan Tabibian,Galal Ashraf Elsayed,Beverly Claire Walters,Barton Lucius Guthrie,Mark Norman Hadley 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.6
Patient satisfaction reflects the patients’ perception of the outcome of care and is being considered for use in future reimbursement schemes. No consensus exists regarding the best instrument to measure patient satisfaction in the field of spine surgery. This systematic review aimed to determine how patient satisfaction for spine surgery has been measured previously and whether a disease-specific, comprehensive instrument to measure patient satisfaction has been established; we also aimed to define the dimensions of care that determine patient satisfaction in spine surgery. A systematic search of three online databases, unpublished sources, and citations was undertaken to identify 156 empirical studies that reported on patient satisfaction in the field of spine surgery. Manuscripts were reviewed in terms of the patient satisfaction instrument used, and the instruments were categorized as per content and method axes. Taxonomy of patient satisfaction with spine surgery identified the major characteristics of providers and medical care that influenced patient satisfaction and acted as a structure to categorically define the dimensions of patient satisfaction in spine surgery. The reviewed studies predominantly used global (108/156) rather than multidimensional (46/156), instruments. Most studies (96.2%) reported satisfaction with outcome rather than with care, and only 18.5% of the studies (29/156) utilized a disease-specific instrument. The following seven dimensions of patient status, outcome, and care experience that affected patient satisfaction were identified: pain, function, patient expectations/preference, specific patient health characteristics, caregiver interpersonal manner, efficacy/clinical outcomes, and postoperative care/therapy. Currently, no disease-specific instrument that includes all dimensions of patient satisfaction in spine surgery has been developed. Such a patient satisfaction instrument should be designed, tested for reliability and validity, and widely implemented.
Graziotti, Guillermo H.,Menendez, Jose M. Rodriguez,Rios, Clara M.,Cossu, Maria E.,Bosco, Alexis,Affricano, Nestor O.,Ceschel, Alejandra Paltenghi,Moisa, Sonia,Basso, Lorenzo Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.1
The aim was to determine the relationship between muscle structure and meat quality traits in neuromuscular compartments (NMCs: R1, R2, R3, R4) of pig semitendinosus muscle. Barrows from the INTA-MGC genetic line (Argentina) were slaughtered at 100 kg body weight. In each NMC the following parameters were determined: the fibre types I, IIA, IIX and IIB by immunohistochemistry, the fibre cross sectional area (FCSA), the pH of meat after 24 h post-mortem ($pH_{24}$), instrumental meat tenderness (WB) and colour ($L^*$, $a^*$, $b^*$). There were significant differences in the following: $L^*$ (R1 = R4<R2 = R3), $a^*$ (R1>R4>R2 = R3), $b^*$ (R1 = R4<R2 = R3), WB (R2>R1 = R3 = R4), $pH_{24}$ (R1 = R4>R2 = R3). The relative percentages of FCSA were as follows: I (R4>R1>R3>R2), IIA (R1>R4>R3>R2), IIX (R1 = R2 = R3 = R4) and IIB (R2>R3>R1>R4). The correlation values were statistically significant between IIB and WB (R1 and R4, $r_s$ = 0.66), (R2 and R3 $r_s$ = 0.74), IIB and $L^*$ (R1 and R4 $r_s$ = 0.84), IIX and $L^*$ without discriminating NMCs. Our data suggest that the NMC where the sampling takes place is important for determining meat quality traits because of the heterogeneity of the whole muscle.
Tunneling the size of iron oxide NPs using different alcohols and proportions water-alcohol
Rivera, F.L.,Sanchez-Marcos, J.,Menendez, N.,Herrasti, P.,Mazario, E. Techno-Press 2020 Advances in nano research Vol.8 No.2
In this work the properties of iron oxide magnetic nanoparticles (MNPs) synthesized by electrochemical method using different water-alcohol proportions and alcohols have been investigated. The syntheses were carried out using 99% iron foils acting electrodes in a 0.04 M NaCl solutions at room temperature applying 22 mAcm<sup>-2</sup> on the working electrode, mostly obtaining magnetite nanoparticles. The impact of the electrolyte in the size of the synthesized MNPs has been evaluated by transmission electron microscopy (TEM), X-ray diffraction (XRD), chronopotentiometric studies, and magnetic characterization. The results have shown that nanoparticles can be obtained in the range of 6 to 26 nm depending on the type of alcohol and the proportions in the mixture of water-alcohol. The same trend has been observed for all alcohols. As the proportion of these in the medium increases, the nanoparticles obtained are smaller in size. This trend is maintained until a certain proportion of alcohol: 50% for methanol, and 60% for the rest of alcohols, proportions where obtaining a single phase of magnetite is not favored.
Belen Lopez-Millan,Rafael Diaz de la Guardia,Heleia Roca-Ho,Carmen M García-Herrero,Jessie R Lavoie,Michael Rosu-Myles,Elena Gonzalez-Rey,Francisco O’Valle,Gabriel Criado,Mario Delgado,Pablo Menendez 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-
Thalidomide is an immunomodulatory drug (IMiD) with proven therapeutic action in several autoimmune/inflammatory diseases; however, its inherent high toxicity has led to the development of more powerful and safer thalidomide analogs, including lenalidomide and pomalidomide. These are new generation IMiDs that exhibit direct antitumor activity as well as anti-inflammatory/immunomodulatory properties, and are FDA-approved for the treatment of several hematological malignances. Here we investigated the potential therapeutic effects of lenalidomide and pomalidomide in several experimental murine models of autoimmune/inflammatory diseases: 2,4,6-trinitrobenzene sulfonic acid- and dextran sulfate sodium-induced inflammatory bowel disease and type II collagen-induced arthritis. Lenalidomide displayed a strong therapeutic effect in all these models of autoimmune/inflammatory diseases, while the effect of pomalidomide was less pronounced. In vitro experiments confirmed the immunosuppressive effect of both IMiDs on the proliferative response of stimulated human lymphocytes and on the balance of secreted cytokines toward an anti-inflammatory profile. We conclude that lenalidomide may offer a therapeutic opportunity against autoimmune/inflammatory diseases.