http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Bioanode of Polyurethane/Graphite/Polypyrrole Composite in Microbial Fuel Cells
Pedro Perez-Rodriguez,Víctor M. Ovando-Medina,Silvia Y. Martinez-Amador,Jose A. Rodriguez-de la Garza 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.2
Polyurethane (PU) foams were coated with graphite, and pyrrole monomer was subsequently polymerized onto its surface by chemical oxidization to obtain nanostructured polyurethane/graphite/polypyrrole (PU/Graph/PPy) composites, which were used for anaerobic microorganisms grown and tested as anodes in microbial fuel cells (MFC) using municipal wastewater as fuel. The effects of oxidizing agent type (ammonium persulfate and FeCl3) used in pyrrole polymerization on the performance of electrodes in MFC were studied. Composites were characterized by Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), and by the four-point probes to determine conductivity. It was observed from SEM analysis that globular nanostructures of PPy were formed onto PU surface with average diameters between 120 and 450 nm, which are typical of aqueous polymerization of pyrrole monomer. The highest output power density observed in MFCs was 305.5 mW/m3 for the composite synthesized using FeCl3 as the oxidant, and 128.6 mW/m3 using the composite obtained with ammonium persulfate as oxidizing; the corresponding chemical oxygen demand (COD) removal were 48.2 and 45.5%, respectively. The calculated coulombic efficiency for PU/Graph/PPy composite obtained with FeCl3 as oxidant was of 9.4%. Internal resistance of MFC using the composite obtained with FeCl3 as oxidant was determined by linear sweep voltammetry (LSV) and the variable resistance (VR) methods, giving 4.8 and 2.9 kΩ, respectively, with average maximum power density of 237.5 mW/m3.
Paola Perez,Jaime Patiño,Alexis A. Franco,Fernando Rosso,Estefania Beltran,Eliana Manzi,Andrés Castro,Mayra Estacio,Diego Medina Valencia 대한혈액학회 2022 Blood Research Vol.57 No.1
Background Antifungal prophylaxis is recommended for hematopoietic stem cell transplantation (HSCT) to decrease the incidence of invasive fungal infections (IFI). This study aimed to compare the two groups of antifungal prophylaxis in pediatric patients undergoing allogeneic HSCT. Methods This observational, analytic, retrospective cohort study compared the incidence of IFI with antifungal prophylaxis with voriconazole vs. other antifungals in the first 100 days after allogeneic HSCT in patients aged <18 years between 2012 and 2018. The statistical analysis included univariate and multivariate analyses and determination of the cumulative incidence of invasive fungal infection by the Kaplan‒Meier method using STATA 14 statistical software. Results A total of 139 allogeneic HSCT were performed. The principal diagnosis was acute leukemia (63%). The 75% had haploidentical donors, and 50% used an antifungal in the month before transplantation. Voriconazole (69%) was the most frequently administered antifungal prophylaxis. The cumulative incidence of IFI was 5% (7 cases). Of the patients with IFIs, four began prophylaxis with voriconazole, one with caspofungin, and one with fluconazole. Additionally, six were possible cases, one was proven (Candida parapsilosis), and 1/7 died. Conclusion There were no differences in the incidence of IFI between patients who received prophylaxis with voriconazole and other antifungal agents.
Gastronomy as an element of attraction in a tourist destination: the case of Lima, Peru
Jesús Claudio Perez Galvez,Tomas Lopez-Guzman,Franklin Cordova Buiza,Miguel Jesús Medina-Viruel 한국식품연구원 2017 Journal of Ethnic Foods Vol.4 No.4
In recent years, gastronomy has become one of the main sources of attraction in the tourist destinations. The objective of this study is to present the results of a research conducted on the foreign tourists in the city of Lima, a World Heritage Site, which is considered as one of the main gastronomic leaders of the world.. The principal results indicate that foreign tourists have different attitudes toward the local gastronomy. Therefore, the foreign tourists were arranged, following the model developed by Björk and Kauppinen-Räisänen (2016), in three different groups: survivors, enjoyers, and experiencers. Furthermore, it shows that the foreign tourists have different motivations regarding gastronomy, which we have grouped into three dimensions: new food experience, culture, and socialization. The results show that the dimensions new food experience and socialization contribute to a greater degree to gastronomic satisfaction.
Weak screening of a large dipolar molecule adsorbed on graphene
Kong, Lingmei,Perez Medina, G.J.,Coló,n Santana, J.A.,Wong, F.,Bonilla, M.,Coló,n Amill, D.A.,Rosa, L.G.,Routaboul, L.,Braunstein, P.,Doudin, B.,Lee, Chang-Mook,Choi, Jaewu,Xiao, Jie,Dowbe Elsevier 2012 Carbon Vol.50 No.5
<P><B>Abstract</B></P><P>We compare the electronic structure of a quinonoid zwitterionic type molecule adsorbed on both gold and graphene on copper substrates. This (6<I>Z</I>)-4-(butylamino)-6-(butyliminio)-3-oxocyclohexa-1,4-dien-1-olate, C<SUB>6</SUB>H<SUB>2</SUB>(⋯_NHR)<SUB>2</SUB>(⋯_O)<SUB>2</SUB> where R=<I>n-</I>C<SUB>4</SUB>H<SUB>9</SUB>, film is made of small molecules with a large intrinsic dipole of 10Debyes. We find that the photoemission and inverse photoemission final states are well screened for these dipolar molecules on gold. This is not observed when they are adsorbed on graphene on copper. This weaker screening results in a larger highest occupied molecular orbital to lowest unoccupied molecular orbital gap for the molecules on graphene.</P>
Sanchez, Cesar,Camus, Mauricio,Medina, Lidia,Oddo, David,Artigas, Rocio,Sepulveda, Alejandra Perez,Domainguez, Francisco,Razmilic, Dravna,Navarro, Maria Elena,Galindo, Hector,Acevedo, Francisco Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12
Background: Pathological factors, based mainly on immunohistochemistry (IHC) and histological differentiation, are mostly used to differentiate breast cancer (BC) subtypes. Our present aim was to describe the characteristics and survival of a relapsing BC patient cohort based on clinico-pathologic subtypes determined for the primary tumors. Methods: We used a clinico- pathological definition of BC subtypes based on histological grade (HG), estrogen receptor (ER), progesterone receptor (PgR),and epidermal growth factor receptor type 2 (HER2) expression assessed by IHC. We determined variables associated with loco-regional recurrence (LRR), second primaries (SP), systemic recurrence (SR) and post-recurrence survival (PRS). Results: Out of 1,702 patients, 240 (14%) had an event defined as recurrence. Those with recurrent disease were significantly younger than those without,and were initially diagnosed at more advanced stages, with larger tumors, greater lymph nodal involvement and higher HG. With a median follow up of 61 months (1-250), 4.6% of patients without recurrence and 56.6% of patients with an event defined as recurrence had died. The median PRS for the LRR group was 77 months; 75 months for those who developed a SP and 22 months for patients with an SR (p <0.0001). In SR cases, the median PRS was shorter for ER- tumors than for ER+ tumors (15 vs. 26 months, respectively; p = 0.0019, HR 0.44; CI: 0.25-0.44). Conclusions: Subtype, defined through classic histopathologic parameters determined for primary tumors, was found to eb related to type of recurrence and also to prognosis after relapse.
Antioxidant Capacity of Crude Extracts from Clones of Banana and Plane Species
Antonio J. Rodriguez-Malaver,Elizabeth M. Perez-P?ez,Nayalet Padilla,Gerardo Medina-Ram?ez,Juan Davila 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.4
Banana and plane are the most important fruits in world trade, behind citric plants. In this work we studiedthe antioxidant capacity of banana and plane varieties of fruits obtained from interspecies crossed varieties of Musa acumi-nataand Musa balbisiana, named Harton plane, Cavendish banana, and Manzano banana. With this purpose we evaluatedbanana and plane crude extracts using the ferrous ion oxidation with xylenol orange method, the thiobarbituric acid method,determination of antioxidant activity, and effect on superoxide anion and hydroxyl radical and the radicals generated by ul-traviolet light. The experiments showed that all extracts have the capacity to decrease the concentrations of lipid hydroper-oxides and malondialdehyde, produced in the lipid peroxidation process, in a manner comparable to that of other widely stud-ied antioxidants like melatonin and vitamin E. Moreover, all extracts had the capacity to inhibit the generation of superoxideanion, hydroxyl radical, and the radicals generated by ultraviolet light. When antioxidant activity was calculated, a value wasfound that was equivalent to a concentration of uric acid between 0.20 and 0.30 mM at the highest concentration of extractused, with uric acid being a potent antioxidant at 1 mM.