http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Gustavo Batista de Castro Souza,Flávio Henrique Teles Vieira,Cláudio Ribeiro Lima,Getúlio Antero de Deus Júnior,Marcelo Stehling de Castro,Sérgio Granato de Araujo,Thiago Lara Vasques 한국전자통신연구원 2016 ETRI Journal Vol.38 No.1
Smart metering systems have become widespread around the world. RF mesh communication systems have contributed to the creation of smarter and more reliable power systems. This paper presents an algorithm for positioning GPRS concentrators to attain delay constraints for a ZigBee-based mesh network. The proposed algorithm determines the number and placement of concentrators using integer linear programming and a queueing model for the given mesh network. The solutions given by the proposed algorithm are validated by verifying the communication network performance through simulations.
Jaquelina J. Guzmán-Rodríguez,Ma. Fabiola León-Galván,José E. Barboza-Corona,Mauricio Valencia-Posadas,Pedro D. Loeza-Lara,Mónica Sánchez-Ceja,Alejandra Ochoa-Zarzosa,Joel E. López-Meza,Abner J. Gutié 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.5
Background: Staphylococcus aureus is one of the main microorganisms that causes bovine mastitis, and its well-known virulence characteristics and interactions with the environment are used to aid the design of more efficient therapies. Objectives: To determine whether the virulence traits, such as antibiotic resistance and biofilm-forming and internalization abilities, of S. aureus isolated from bovine mastitis are related to dairy production system types. Methods: The study was performed in the Mexican states of Guanajuato and Michoacan. Semi-intensive dairy farms (SIDFs) and family dairy farms (FDFs) (454 and 363 cows, respectively) were included. The 194 milk samples from mastitis affected quarters were collected and 92 strains of S. aureus were isolated and identified by biochemical and molecular tests. Antibiotic resistance, biofilm and internalization assays were performed on 30 randomly selected isolated strains to determine virulence traits, and these strains were equally allocated to the 2 dairy production systems. Results: All 30 selected strains displayed a high degree of resistance (50%–91.7%) to the antibiotics tested, but no significant difference was found between SIDF and FDF isolates. S. aureus strains from SIDFs had an average biofilm forming capacity of up to 36% (18.9%–53.1%), while S. aureus strains from FDFs registered an average of up to 53% (31.5%–77.8%) (p > 0.05). Internalization assays revealed a higher frequency of internalization capacity for strains isolated from FDFs (33.3%) than for those isolated from SIDFs (6.7%) (p > 0.05). fnbpA gen was detected in 46.6% of FDF strains and 33.3% of SIDF strains, and this difference was significant (p < 0.05). Conclusions: Our findings show that the virulence traits of S. aureus isolates analyzed in this study, depend significantly on several factors, such as phenotype, genotype, and environmental conditions, which are significantly related to dairy production system type and daily management practices.
R. Rangel,J. A. Cortes,J. Lara,P. QUINTANA,J. J. ALVARADO-GIL,O. Contreras 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
Studies on photocatalytic degradation of lignin are scarce, even though it is an effective method for treatment of industrial effluents. In the present work, an advanced oxidation process (AOPs), leading to the photodegradation of lignin aqueous solutions, is proposed by using microstructured (T-MT) and nanostructured (T-NT) titanium dioxide compounds. Hydrothermal synthesis, in accordance with an experimental factorial design considering time of synthesis, NaOH concentration and synthesis temperature, was used to produce tunable TiO2 photocatalysts for further study of its effects on the degradation of lignin. Photocatalytic reactions were conducted in a micro reactor batch system under UV irradiation. The catalysts were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area and porosity analyzer (BET), energy-dispersive X-ray spectroscopy (EDS) and UV-Vis diffuse reflectance spectroscopy. In order to optimize the yield reaction, an experimental factorial design was performed. According to our results, nanostructured TiO2 consisting in different structural features and light absorption properties were produced using this method. It is shown that T-MT and T-NT compounds exhibit a wide range of values, for the kinetic parameters, in photoinduced degradation of methylene blue (MB) and lignin.
Group quenching and galactic conformity at low redshift
Treyer, M,Kraljic, K,Arnouts, S,de la Torre, S,Pichon, C,Dubois, Y,Vibert, D,Milliard, B,Laigle, C,Seibert, M,Brown, M J I,Grootes, M W,Wright, A H,Liske, J,Lara-Lopez, M A,Bland-Hawthorn, J Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.477 No.2
Myers, Lara,Lee, Seung Woo,Rossi, Robert J.,Lefrancois, Leo,Kwon, Byoung S.,Mittler, Robert S.,Croft, Michael,Vella, Anthony T. Oxford University Press 2006 International immunology Vol.18 No.2
<P>In practice, vaccines should induce lasting and efficacious T cell immunity without promoting deleterious pathological consequences. To accomplish this goal we immunized mice with ovalbumin peptide, polyinosinic–polycytidylic and anti-CD137. Vaccinated mice retained a massive functional CD8 T cell memory pool in lymphoid and non-lymphoid tissues for >1 year. The memory T cells clonally expanded, produced substantial amounts of IFNγ, and responded vigorously to vesicular stomatitis virus infection. To understand how the vaccine might function, we showed that the antigen-specific T cells must bear CD137 in order for optimal priming to occur. Thus, anti-CD137 agonist mAb directly stimulated peptide-specific CD8 T cells and conditioned them to survive. In contrast, CD137-deficient CD8 T cells did not survive despite CD137 expression by antigen presenting cells. Taken together, the data indicate that CD137 and adjuvant combined therapy is an efficacious vaccine strategy for immunization with non-replicating inert antigen.</P>
Y. Lara-López,G. García-Rosales,J. Jiménez-Becerril 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.1
In this work, titanium oxide particles were synthesized (TiO2) by the sol-gel technique, yielding spherical particles with anaverage diameter of 55 nm and surface area of 50.6 m2/g. The material’s major crystallographic phase is rutile. The CeO2particles synthesized in this work present a spherical morphology of 40 nm with a specific surface area of 43.6 m2/g andrepresent the cerianite crystalline phase. In addition, by means of this synthesis technique, particles composed of TiO2 andceria CeO2 that have an average diameter were not affected by the presence of CeO2. However, the specific area (81 m2/g)significantly increased. Strangely, in the composite material, the predominant phase occurred due to the presence of CeO2,which prevents the growth of rutile crystals. The phenol degradation tests showed that at an initial concentration of 30 mg/L, TiO2 degrades in approximately 20% of phenol after 120 minutes, but at an initial concentration of 50 mg/L, degrades atapproximately 15% after 180 minutes. The other synthesized materials reach degradation of only around 3% in both phenolconcentrations.
Preparation and characterization of TiN powder by reactive milling in air
Joaquina Orea-Lara,Heberto Balmori-Ramírez,F. J. de Anda-Salazar,H. Yee-Madeira 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.1
TiN powder was obtained by the reactive milling of a titanium powder in an air atmosphere, utilizing an attrition mill. Characterization of the powders was carried out by means of chemical analysis, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The reaction took place over a period of 96 hours in the attrition mill. The XRD results indicate that a cubic TiN-like phase crystalline structure was produced in the mill, with a lattice parameter of 4.38 Å. The morphology of the obtained powders was nodular, having particle sizes within the nanometric size range. TiN powder was obtained by the reactive milling of a titanium powder in an air atmosphere, utilizing an attrition mill. Characterization of the powders was carried out by means of chemical analysis, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The reaction took place over a period of 96 hours in the attrition mill. The XRD results indicate that a cubic TiN-like phase crystalline structure was produced in the mill, with a lattice parameter of 4.38 Å. The morphology of the obtained powders was nodular, having particle sizes within the nanometric size range.
( Fazila Sirajudeen ),( Lara J. Bou Malhab ),( Yasser Bustanji ),( Moyad Shahwan ),( Karem H. Alzoubi ),( Mohammad H. Semreen ),( Jalal Taneera ),( Waseem El-huneidi ),( Eman Abu-gharbieh ) 한국응용약물학회 2024 Biomolecules & Therapeutics(구 응용약물학회지) Vol.32 No.1
Cancer is a global health challenge with high morbidity and mortality rates. However, conventional cancer treatment methods often have severe side effects and limited success rates. In the last decade, extensive research has been conducted to develop safe, and efficient alternative treatments that do not have the limitations of existing anticancer medicines. Plant-derived compounds have shown promise in cancer treatment for their anti-carcinogenic and anti-proliferative properties. Rosmarinic acid (RA) and carnosic acid (CA) are potent polyphenolic compounds found in rosemary (Rosmarinus officinalis) extract. They have been extensively studied for their biological properties, which include anti-diabetic, anti-inflammatory, antioxidant, and anticancer activities. In addition, RA and CA have demonstrated effective anti-proliferative properties against various cancers, making them promising targets for extensive research to develop candidate or leading compounds for cancer treatment. This review discusses and summarizes the anti-tumor effect of RA and CA against various cancers and highlights the involved biochemical and mechanistic pathways.
Kim, Eun J.,Abramowitz, Lara K.,Bond, Michelle R.,Love, Dona C.,Kang, Dong W.,Leucke, Hans F.,Kang, Dae W.,Ahn, Jong-Seog,Hanover, John A. American Chemical Society 2014 Bioconjugate chemistry Vol.25 No.6
<P/><P>The dynamic glycosylation of serine/threonine residues on nucleocytoplasmic proteins with a single <I>N</I>-acetylglucosamine (<I>O</I>-GlcNAcylation) is critical for many important cellular processes. Cellular <I>O</I>-GlcNAc levels are highly regulated by two enzymes: <I>O</I>-GlcNAc transferase (OGT) is responsible for GlcNAc addition and <I>O</I>-GlcNAcase (OGA) is responsible for removal of the sugar. The lack of a rapid and simple method for monitoring OGT activity has impeded the efficient discovery of potent OGT inhibitors. In this study we describe a novel, single-well OGT enzyme assay that utilizes 6 × His-tagged substrates, a chemoselective chemical reaction, and unpurified OGT. The high-throughput Ni-NTA Plate OGT Assay will facilitate discovery of potent OGT-specific inhibitors on versatile substrates and the characterization of new enzyme variants.</P>
Cardenas-Rodriguez, N.,Lara-Padilla, E.,Bandala, C.,Lopez-Cruz, J.,Uscanga-Carmona, C.,Lucio-Monter, P.F.,Floriano-Sanchez, E. Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.3
Breast cancer (BCa) is the leading type of cancer in Mexican women. Genetic factors, such as single nucleotide polymorphisms (SNP) of P450 system, have been reported in BCa. In this report, and for the first time in the literature, we analyzed the rs3735684 (7021 G>A), rs11553651 (15016 G>T) and rs56195291 (60020 C>G) polymorphisms in the CYP2W1, 4F11 and 8A1 genes in patients with BCa and in healthy Mexican women to identify a potential association between these polymorphisms and BCa risk. Patients and controls were used for polymorphism analysis using an allelic discrimination assay with TaqMan probes and confirmed by DNA sequencing. Links with clinic-pathological characteristics were also analyzed. Statistical analysis was performed using the standard ${\chi}^2$ or Fisher exact test statistic. No significant differences were observed in the distributions of CYP2W1 (OR 8.6, 95%CI 0.43-172.5 P>0.05; OR 2.0, 95%CI 0.76-5.4, P>0.05) and CYP4F11 (OR 0.3, 95%CI 0.01-8.4 P>0.05) genotypes between the patients and controls. Only the CYP8A1 CC genotype was detected in patients with BCa and the controls. All polymorphism frequencies were in Hardy-Weinberg Equilibrium (HWE) in the controls (P>0.05). We found a significant association between BCa risk and smoking, use of oral contraceptives or hormonal replacement therapy (HRT), obesity, hyperglycemia, chronic diseases, family history of cancer and menopausal status in the population studied (P<0.05). Tobacco, oral contraceptive or HRT, chronic diseases and obesity or overweight were strongly associated with almost eight, thirty-five, nine and five-fold increased risk for BCa. Tobaco, obesity and hyperglycemia significantly increased the risk of BCa in the patients carrying variant genotypes of CYP2W1 (P<0.05). These results indicate that the CYP2W1 rs3735684, CYP4F11 rs11553651 and CYP8A1 rs56195291 SNPs are not a key risk factor for BCa in Mexican women. This study did not detect an association between the CYP2W1, 4F11 and 8A1 genes polymorphisms and BCa risk in a Mexican population. However, some clinico-pathological risk factors interact with CYP2W1 genotypes and modifies susceptibility to BCa.