oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 20 )

2018 ( 11 )

2017 ( 16 )

2016 ( 23 )

Custom range...

Search Results: 1 - 10 of 7884 matches for " Edwin Vargas "
All listed articles are free for downloading (OA Articles)
Page 1 /7884
Display every page Item
Teorema de Hall y un algoritmo para detectar sistemas de representantes distintos
Edwin Carranza Vargas
Pensamiento Matemático , 2012,
Abstract: Este trabajo presenta dos aportes a la combinatoria aplicada el primerola relación de equivalencia de los Teoremas de Ford- Fulkerson, Menger,K ning, Dilworth y Hall, además presenta una nueva prueba al Teoremade Hall que sirve como algoritmo para detectar sistemas de representantes distintos.En cada sección se establecen generalidades de los teoremas mencionados y nalmente el algoritmo con su respectiva justi cación.
The hydraulic mission and the Mexican hydrocracy: Regulating and reforming the flows of water and power
Philippus Wester,Edwin Rap,Sergio Vargas-Velázquez
Water Alternatives , 2009,
Abstract: In Mexico, the hydraulic mission, the centralisation of water control, and the growth of the federal hydraulic bureaucracy (hydrocracy) recursively shaped and reinforced each other during the 20th century. The hydraulic mission entails that the state, embodied in an autonomous hydrocracy, takes the lead in water resources development to capture as much water as possible for human uses. The hydraulic mission was central to the formation of Mexico’s hydrocracy, which highly prized its autonomy. Bureaucratic rivals, political transitions, and economic developments recurrently challenged the hydrocracy’s degree of autonomy. However, driven by the argument that a single water authority should regulate and control the nation’s waters, the hydrocracy consistently managed to renew its, always precarious, autonomy at different political moments in the country’s history. The legacy of the hydraulic mission continues to inform water reforms in Mexico, and largely explains the strong resilience of the Mexican hydrocracy to "deep" institutional change and political transitions. While the emphasis on infrastructure construction has lessened, the hydrocracy has actively renewed its control over water decisions and budgets and has played a remarkably constant, hegemonic role in defining and shaping Mexico’s water laws, policies and institutions.
Evaluación de la fertilidad y eclosión en la codorniz japonesa
Galíndez,Rafael; De Basilio,Vasco; Martínez,Gonzalo; Vargas,Daniel; Uztariz,Edwin; Mejía,Patricia;
Zootecnia Tropical , 2009,
Abstract: with the aim to study the effect of some non genetic factors on fertility and hatchability of quails (coturnix coturnix japonica) under two different reproduction systems (modalities of matching), three analyses of variance were realized assuming a binomial distribution of the data. there were used 2613 records for fertility (fe), 2178 for total hatchability (th), and 1413 for fertile hatchability (fh) from a group of experimental quails. the effects of month of lay, generation, and type of matching were included for fe and for th and fh were added egg weight, eggshell color and sheen. water and food were offered ad libitum. the relation male: female was 1:3. two modalities of reproduction were studied: rotary (rotating the male) and continuous (permanent presence of the male). fertility, th and fh averages were 78.7, 25.8, and 42.3%, respectively. the month of higher (p<0.01) fertility was march (91.1%), whereas november had the lowest (51.7%). the higher th and fh (p<0.01) was in august (42.6 and 65.7%) and the lower th and fh were observed in april (12.5 and 17.9%). there was higher fertility (p<0.01, 86.2%) in the eggs from continuous reproduction system. eggs with higher th (p<0.01) were those of brilliant eggshell (43.9%), dark color eggshell (48.0%) and intermediate weight (10.1 to 11.0 g; 44.0%). it can be concluded that the eggs of dark color, brilliant eggshell, and intermediate weight laid in the rainy months had better properties for the process of incubation. likewise, in farms where the rotary matching is not necessary, it is advisable to use the continuous reproduction system.
Efecto del mes de incubación, caracteres físicos del huevo y almacenamiento, sobre la mortalidad embrionaria en Codornices Japonesas (Coturnix coturnix japonica)
Galíndez,Rafael; De Basilio,Vasco; Martínez,Gonzalo; Vargas,Daniel; Uztariz,Edwin; Mejía,Patricia;
Zootecnia Tropical , 2010,
Abstract: to study the effect on the embryonic mortality until the 17th day (m17) and between the 18th and 21st day (m21), of month of lay (mp), egg weight (ph), shell color (cch), shell sheen (brh) and time of storage (ta), analyses of variance were realized assuming a binomial distribution of the data, using 1403 records for m17 and 845 for m21 of five incubations of eggs gathered from 120 experimental quails of the poultry section-laboratory (ucv). water and food were offered ad libitum. was found mortality averages of 29,9 % and 35,04 % for m17 and m21, respectively. the month of higher (p <0,01) mortality was april (56,90 % and 48,22 %); whereas the lowest mortality happened in may (20,95 %) and june (18,09 %) for m17 and m21, respectively. eggs with higher mortality (p <0,01) were those that weighed less than 10 g. (41,94 %), of brilliant shell (38,71 %) and stored for more than 8 days (40,48 % and 60,35 % for m17 and m21, respectively). in conclusion less mortality occurs in those eggs incubated in the rainy months, with superior weight to 10 g., with mat shell and stored for less than 8 days
Conocimiento sobre Lactancia Materna en Madres de los Centros de Salud Pacata y Jaihuayco del 2008 al 2009
Alvaro Ulunque Unzueta,Edwin Uria Guisbert,José C. Vairo Gamarra,Alexander Vargas Almendras
Revista Científica Ciencia Médica , 2010,
Abstract: El presente trabajo tiene como finalidad evaluar el conocimiento sobre lactancia materna en los Centros de Salud de Tupuraya y Jaihuayco (por conveniencia), porque la leche materna es el alimento ideal para promover el desarrollo y crecimiento neonatal durante los primeros 4 a 6 meses de vida.Es un estudio descriptivo, transversal cuantitativo donde a través de encuestas se estudió a una muestra total de 40 madres, 17 madres que asistieron al Centro de Salud Tupuraya durante los meses de Agosto y Septiembre del a o 2008 y 23 madres que asistieron al Centro de Salud Jaihuayco durante los meses de Agosto y Septiembredel a o 2009. Algunos resultados relevantes obtenidos en las madres encuestadas muestran que el 45% no conocen el tiempo exclusivo de lactancia materna, el 40% dan LM junto con leche de vaca y/o leche artificial durante el tiempo exclusivo de lactancia, el 57,5% consumen bebidas alcohólicas durante el período de lactancia y el 30% sufren de complicaciones clínicas en la glándula mamaria durante el período de lactancia. El conocimiento sobre lactancia materna que tienen las madres es insuficiente e inadecuado, por lo que el presente trabajo en base a los resultados encontrados propone realizar estudios sobre conocimiento para ver si es conveniente elaborar un programa de capacitación sobre lactancia en madres que asistan a distintos hospitales o centros de salud en Cochabamba por estudiantes que cursen el 1er y 2do a o académico en la carrera de medicina en las materias de Medicina Social y Preventiva.
Directed DNA Shuffling of Retrovirus and Retrotransposon Integrase Protein Domains
Xiaojie Qi, Edwin Vargas, Liza Larsen, Whitney Knapp, G. Wesley Hatfield, Richard Lathrop, Suzanne Sandmeyer
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0063957
Abstract: Chimeric proteins are used to study protein domain functions and to recombine protein domains for novel or optimal functions. We used a library of chimeric integrase proteins to study DNA integration specificity. The library was constructed using a directed shuffling method that we adapted from fusion PCR. This method easily and accurately shuffles multiple DNA gene sequences simultaneously at specific base-pair positions, such as protein domain boundaries. It produced all 27 properly-ordered combinations of the amino-terminal, catalytic core, and carboxyl-terminal domains of the integrase gene from human immunodeficiency virus, prototype foamy virus, and Saccharomyces cerevisiae retrotransposon Ty3. Retrotransposons can display dramatic position-specific integration specificity compared to retroviruses. The yeast retrotransposon Ty3 integrase interacts with RNA polymerase III transcription factors to target integration at the transcription initiation site. In vitro assays of the native and chimeric proteins showed that human immunodeficiency virus integrase was active with heterologous substrates, whereas prototype foamy virus and Ty3 integrases were not. This observation was consistent with a lower substrate specificity for human immunodeficiency virus integrase than for other retrovirus integrases. All eight chimeras containing the Ty3 integrase carboxyl-terminal domain, a candidate targeting domain, failed to target strand transfer in the presence of the targeting protein, suggesting that multiple domains of the Ty3 integrase cooperate in this function.
In Silico Whole Genome Association Scan for Murine Prepulse Inhibition
Bradley Todd Webb, Joseph L. McClay, Cristina Vargas-Irwin, Timothy P. York, Edwin J. C. G. van den Oord
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0005246
Abstract: Background The complex trait of prepulse inhibition (PPI) is a sensory gating measure related to schizophrenia and can be measured in mice. Large-scale public repositories of inbred mouse strain genotypes and phenotypes such as PPI can be used to detect Quantitative Trait Loci (QTLs) in silico. However, the method has been criticized for issues including insufficient number of strains, not controlling for false discoveries, the complex haplotype structure of inbred mice, and failing to account for genotypic and phenotypic subgroups. Methodology/Principal Findings We have implemented a method that addresses these issues by incorporating phylogenetic analyses, multilevel regression with mixed effects, and false discovery rate (FDR) control. A genome-wide scan for PPI was conducted using over 17,000 single nucleotide polymorphisms (SNPs) in 37 strains phenotyped. Eighty-nine SNPs were significant at a false discovery rate (FDR) of 5%. After accounting for long-range linkage disequilibrium, we found 3 independent QTLs located on murine chromosomes 1 and 13. One of the PPI positives corresponds to a region of human chromosome 6p which includes DTNBP1, a gene implicated in schizophrenia. Another region includes the gene Tsn which alters PPI when knocked out. These genes also appear to have correlated expression with PPI. Conclusions/Significance These results support the usefulness of using an improved in silico mapping method to identify QTLs for complex traits such as PPI which can be then be used for to help identify loci influencing schizophrenia in humans.
Noise-compensating pulses for electrostatically controlled silicon spin qubits
Xin Wang,Fernando A. Calderon-Vargas,Muhed S. Rana,Jason P. Kestner,Edwin Barnes,Sankar Das Sarma
Physics , 2014, DOI: 10.1103/PhysRevB.90.155306
Abstract: We study the performance of SUPCODE---a family of dynamically correcting pulses designed to cancel simultaneously both Overhauser and charge noise for singlet-triplet spin qubits---adapted to silicon devices with electrostatic control. We consider both natural Si and isotope-enriched Si systems, and in each case we investigate the behavior of individual gates under static noise and perform randomized benchmarking to obtain the average gate error under realistic 1/f noise. We find that in most cases SUPCODE pulses offer roughly an order of magnitude reduction in gate error, and especially in the case of isotope-enriched Si, SUPCODE yields gate operations of very high fidelity. We also develop a version of SUPCODE that cancels the charge noise only, "$\delta J$-SUPCODE", which is particularly beneficial for isotope-enriched Si devices where charge noise dominates Overhauser noise, offering a level of error reduction comparable to the original SUPCODE while yielding gate times that are 30% to 50% shorter. Our results show that the SUPCODE noise-compensating pulses provide a fast, simple, and effective approach to error suppression, bringing gate errors well below the quantum error correction threshold in principle.
Severe & Moderate BPH Symptoms in Mid-Aged Men Improve with Isoflavonoid-Equol Treatment: Pilot Intervention Study  [PDF]
Edwin D. Lephart
Open Journal of Urology (OJU) , 2013, DOI: 10.4236/oju.2013.31004
Abstract:

Benign prostatic hyperplasia (BPH) is the pathological cellular progression of glandular proliferation associated with aging. Current available treatment options for BPH have limitations and various adverse effects. Equol is a polyphenolic/isoflavonoid molecule derived from intestinal metabolism, dairy and dietary plant sources. It has the unique characteristic to bind specifically 5α-dihydrotestosterone (5α-DHT) by sequestering 5α-DHT from the androgen receptor, thus decreasing androgen hormone actions to improve prostate health by acting as a selective androgen modulator (SAM). It also has affinity for estrogen related receptor gamma (ERR-γ) and estrogen receptor beta (ER-β) within the prostate that is known to improve male health via selective estrogen receptor modulatory (SERM) activities to decrease inflammation, cellular proliferation and carcinogenesis. We investigated the possible clinical efficacy of equol on the symptoms associated with benign prostatic hyperplasia (BPH) in this study. Materials and Methods: We performed a pilot intervention study evaluating the effects of low dose oral equol supplement (6 mg, twice a day with meals) for 4 weeks in a total of 18 men (49 - 60 years old) with moderate or severe BPH. Subjects included in the study: gave informed consent, underwent a physical examination and verified their BPH symptoms as measured by the International Prostate Symptom Scores (IPSS) and then were assigned to the moderate or severe BPH groups based upon their total IPSS index. All adverse events were reported. The primary efficacy measure was the IPSS parameters comparing baseline to 2 and 4 week IPSS indices. Blood samples were collected at the baseline and 4th week visits that served as secondary efficacy parameters that included testosterone, 5α-DHT and general blood chemistries along with cardiac and hepatic function panels. Results: Low dose equol positively improved moderate to severe BPH symptoms according to the IPSS indices. In moderately symptomatic men (n = 10) 5 out of 7 of the IPSS parameters significantly improved by 4 weeks of equol treatment. In severely symptomatic men (n = 8) all 7 of the IPSS parameters significantly improved with 4 weeks of equol treatment. There were no significant changes in androgen levels, general blood chemistries or cardiac and hepatic function parameters. Although, 5α-DHT levels declined by 21% in severely symptomatic men (from baseline vs. 4 week values).

Smoking and Pancreatic Disease  [PDF]
Mouad Edderkaoui, Edwin Thrower
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.410A005
Abstract:

Smoking is a major risk factor for chronic pancreatitis and pancreatic cancer. However, the mechanisms through which it causes the diseases remain unknown. In the present manuscript we reviewed the latest knowledge gained on the effect of cigarette smoke and smoking compounds on cell signaling pathways mediating both diseases. We also reviewed the effect of smoking on the pancreatic cell microenvironment including inflammatory cells and stellate cells.

Page 1 /7884
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.