oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 11 )

2019 ( 429 )

2018 ( 510 )

2017 ( 533 )

Custom range...

Search Results: 1 - 10 of 395489 matches for " C. R. Angel "
All listed articles are free for downloading (OA Articles)
Page 1 /395489
Display every page Item
Cosmological Equations for Interacting Energies
Alberto C. Balfagon,Raul Ramirez-Satorras,Angel R. Martinez
Physics , 2010,
Abstract: In this paper the coupling between dark energy and the other components of the cosmological fluid has been studied. Firstly, it will be shown that the application of general cosmological equations, deduced by the authors in a previous work, to the known data of the Abell cluster A586 using the Layzer-Irvine theory gives similar results compared to the work of other authors. The aforesaid method present some problems: the application of an approximate theory (Layzer-Irvine theory), it has only one experimental datum and finally, it gives results that are a bit difficult to admit considering a physical reasoning. In order to avoid the above-mentioned problems, a way to study the coupling of dark energy with other Universe components has been shown. The results obtained have a sensible physical behavior. They also fix the required functionality of the product $w_\Lambda \Omega_\Lambda$ in order to verify the main known properties of the Universe's behavior. Finally, these results permit to make predictions about a set of different cosmological properties.
Analgesia preventiva postoperatoria con dexmedetomidina en hernioplastia inguinal
Del Angel García, R.;Castellanos Olivares, A.;Munguia Miranda, C.;
Gaceta médica de México , 2006,
Abstract: background: preemptive analgesia, is obtained via aspartate antagonists and glutamate, neurotransmitters released during tissular injury. objective asses preemptive analgesia with dexmedetomidine and consumption of a postanesthesia analgesic. material and methods: male patients, 20-65 years ago were recruited after protocol review and informed consent was obtained. patients were randomized in three groups, using dexmedetomidine as preemptive analgesia in inguinal hernioplasty. results: subjects had a mean age of 45.3± 13.2 yrs. among patients where dexmedetomidine was administered prior to anesthesia, three had, low heart frequency (60 bpm) and required that analgesia be given for 3.14 hrs. among patients in whom dexmedetomidine was administered during transanesthesia, two registered low heart frequency (60 bpm.) and required analgesia for 2.27 hrs. in the control group, one patient had a heart frequency of 43 bpm; mean analgesic administration time was 39 minutes. there were no significant variations in arterial pressure. statistical analysis included anova, and student's t-test to assess analgesia and initial time of analgesia consumption at p < 0.001. conclusion: intravenous dexmedetomidine administered prior to anesthesia decreases pain intensity and consumption of postoperative analgesia.
Produ??o de Lactobacillus plantarum em Mela?o de Cana-de-a?úcar
Villavicencio, Angel R. N.;Sant?Anna, Ernani S.;T?rres, Regina C. O.;
Brazilian Archives of Biology and Technology , 1999, DOI: 10.1590/S1516-89131999000200015
Abstract: comparative growth studies of pediococcus pentosaceus were done in mrs (control) culture medium as well as in culture medium of 5% sugar cane blackstrap molasses (broth 1) enriched with yeast extract (broth 2) and enriched with beef extract (broth 30. the experiment was carried out in a shaker (96 rpm) in 250 ml erlenmeyers flasks with working volume of 150 ml, initial inoculum of about 103 - 104 fcu/ml, at 35 ± 1oc temperature and 28-hour fermentation. the biomass pruductivity was higher in mrs broth (0.0375 g/l.h), followed by broth 2 (0.0275), broth 3 (0.0189) and broth 1 (0.0151). the higher viable cells number occured in mrs (13.96 log10 fcu/ml), followed by broth 2 (12.09), broth 3 (10.12) and broth 1 (8.42).
PORCENTAJE DE COMPROMISO DE LESION CERVICAL DE ALTO GRADO Y PERSISTENCIA DE ENFERMEDAD RESIDUAL POSTCONO
González C.,Fernando; Napolitano R.,Cayetano; Trewhela N.,Ricardo; Donoso P.,Patricio; Cumsille,Miguel Angel;
Revista chilena de obstetricia y ginecología , 2002, DOI: 10.4067/S0717-75262002000100008
Abstract: the objetive of this research was to compare the percentage of persistence of residual lesion on hysterectomy specimen after a cone biopsy done with leep (loop electroexcision procedure) in patients with "high grade sil" (squamous intraepithelial lesion). we present 78 patients that a cone biopsy with leep was done and subsequently had a histerectomy, between june 1994 and december 2000, for residual disease or other gynecological conditions. the pathology reports were statistically significant in between the percentage of compromised cervical biopsies and the persistence of disease in the uterus
Faster Heart Rates During Early Graded Exercise May Account for Shorter Exercise Time Duration in Women
Anca Iliescu,R.D.C. S Beth Gulyasy,Angel L?pez-Candales
The Cardiology , 2011,
Abstract: Recent data suggests that measures of autonomic dysfunction while differ with heart rate, gender and functional capacity are unaffected by body mass index (BMI); however none of these same parameters have been assessed during routine stress testing despite the well-known modulation of heart rate (HR) by the autonomic nervous system during dynamic exercise. In this study, data from 88 consecutive individuals who had a normal treadmill stress echo study was analyzed and differences in HR during and after exercise were recorded and examined with regards to gender, BMI and total exercise duration. An exercise capacity of less than 9 min identified individuals with significantly faster increments in HR during early stages of exercise (p<0.02 for 1 min, p<0.0003 at 2 min, p<0.0001 at 3 min) when compared to individuals who exercised longer. Although, no statistical difference was noted between HR response with either age or BMI, females had significantly higher increments in HR early during exercise than males (115?15 versus 103?15 beats per minute; p< 0.0004; respectively) at 1 min, (125?17 versus 109?16 beats per minute, p<0.0001) at 2 min, (129?17 versus 112?18 beats per minute, p<0.00002) at 3 min and (144?18 versus 130?18 beats per minute p<0.001) at 6 min even though both females and males attained similar peak HR. Rapid increments in HR early into exercise occur more commonly in females; that although independent of age and BMI, are associated with a shorter exercise time duration. Further studies are now required to assess the importance of these fast increments in HR early into exercise seen more commonly in females, in the absence of exercise-induced myocardial ischemia and with a preserved left ventricular systolic function with relation to long term cardiovascular events.
Genetic variation in nitrogen and phosphorus content in broiler excreta
A. K. Sasikala-Appukuttan,D. L. Pollock,C. R. Angel,F. Siewerdt
Genomics and Quantitative Genetics , 2010,
Abstract: The nutrient content in the soil surrounding the poultry farms has increased as a result of the high content of nitrogen (N) and phosphorus (P) in the poultry excreta. The current study aimed to propose a strategy to reduce the N and P content in the excreta by genetic selection in broilers for efficient nutrient utilization. The traits measured were the percentage of N in the excreta (PNE) and the percentage of P in the excreta (PPE), on a dry matter basis. Individual 24-hr excreta samples were collected from 6 wk old birds. Excreta samples were collected from birds of two distinct genetic lines raised in a commercial breeding farm. Analysis of excreta samples collected during the first period (197 bird samples belonging to 15 sire families) and second period (278 birds belonging to 25 sire families) suggested a heritability of 0.08, 0.16 for PNE and 0, 0.20 for PPE, respectively. Phenotypic and genetic correlations between the measured traits from the two lines were very low; however, phenotypic correlation analysis of PNE and PPE with other traits of commercial interest showed some favorable as well as neutral associations. The results suggest that genetic selection of birds for PNE and PPE could improve the environment and the market value of the birds.
El cultivo de alfalfa utilizando agua de perforación, agua residual urbana y precipitaciones The cultivation of alfalfa using artesian well water, urban wastewater and rainfall
José O. Plevich,Angel R. S. Delgado,Cecilia Saroff,Juan C. Tarico
Revista Brasileira de Engenharia Agrícola e Ambiental , 2012, DOI: 10.1590/s1415-43662012001200013
Abstract: El objetivo de este trabajo fue analizar la producción de biomasa aérea, la eficiencia del uso de agua y el valor nutritivo de alfalfa cultivada aplicando riego con agua residual urbana, agua de perforación y un testigo (precipitaciones), en el Campus de la Universidad Nacional de Rio Cuarto (Córdoba-Argentina). Los tratamientos de riego tuvieron un efecto positivo sobre la producción de biomasa aérea obteniéndose un 24% más de producción de biomasa que en la situación de secano (precipitaciones). Entre los tratamientos con riego también se manifestaron diferencias estadísticamente significativas. La alfalfa regada con aguas residuales urbana supero en un 19% a la cultivada con agua de perforación. La eficiencia del uso del agua por parte del cultivo se incrementó cuando el riego se realizó con aguas residuales urbanas. Además, se determinó que la alfalfa regada con agua residual, supera los valores nutritivos del cultivo que crece en condiciones sin riego; encontrándose 39% más de proteínas, 14% más de digestibilidad e igual porcentaje de energía metabólica. Se puede concluir que el agua residual urbana representa otra posible fuente de agua, factible de ingresar al suelo y estar a disposición para el cultivo de alfalfa. The objective of this study was to analyse the production of alfalfa biomass, the efficiency of water use and the nutritional value of forage, inside an irrigation structure of an experimental facility that uses treated urban wastewater, artesian well water and rainfall, at the campus of the Universidad National de Rio Cuarto (Córdoba-Argentina). The irrigation treatment had a positive effect on the production of biomass of alfalfa. On an average 24% increase in production was observed when compared to dry-land farming. Regarding the quality of the irrigation water, statistical differences in production were observed, the irrigation with urban wastewater produced 19% more than that of well water. The efficiency of the water use by the crop increased when the irrigation was done using urban wastewater. The alfalfa irrigated with wastewater surpasses the nutritional values of the crop in normal field conditions: 39% more proteins, 14% more digestibility and equal percentage of metabolic energy. It is concluded that the urban wastewater represents possible water source for the alfalfa crop.
Faster Heart Rates During Early Graded Exercise May Account for Shorter Exercise Time Duration in Women
Anca Iliescu,R.D.C. S Beth Gulyasy,Angel L?pez-Candales
The Cardiology , 2005,
Abstract: Recent data suggests that measures of autonomic dysfunction while differ with heart rate, gender and functional capacity are unaffected by body mass index (BMI); however none of these same parameters have been assessed during routine stress testing despite the well-known modulation of heart rate (HR) by the autonomic nervous system during dynamic exercise. In this study, data from 88 consecutive individuals who had a normal treadmill stress echo study was analyzed and differences in HR during and after exercise were recorded and examined with regards to gender, BMI and total exercise duration. An exercise capacity of less than 9 min identified individuals with significantly faster increments in HR during early stages of exercise (p<0.02 for 1 min, p<0.0003 at 2 min, p<0.0001 at 3 min) when compared to individuals who exercised longer. Although, no statistical difference was noted between HR response with either age or BMI, females had significantly higher increments in HR early during exercise than males (115±15 versus 103±15 beats per minute; p< 0.0004; respectively) at 1 min, (125±17 versus 109±16 beats per minute, p<0.0001) at 2 min, (129±17 versus 112±18 beats per minute, p<0.00002) at 3 min and (144±18 versus 130±18 beats per minute p<0.001) at 6 min even though both females and males attained similar peak HR. Rapid increments in HR early into exercise occur more commonly in females; that although independent of age and BMI, are associated with a shorter exercise time duration. Further studies are now required to assess the importance of these fast increments in HR early into exercise seen more commonly in females, in the absence of exercise-induced myocardial ischemia and with a preserved left ventricular systolic function with relation to long term cardiovascular events.
Organotin(IV) complexes with 2-acetylpyridine benzoyl hydrazones: antimicrobial activity
Despaigne, Angel A. R.;Vieira, Lorena F.;Mendes, Isolda C.;Costa, Fernanda B. da;Speziali, Nivaldo L.;Beraldo, Heloisa;
Journal of the Brazilian Chemical Society , 2010, DOI: 10.1590/S0103-50532010000700012
Abstract: reaction of n-butyltin trichloride, [bunsncl3], and phenyltin trichloride, [phsncl3], with 2-acetylpyridine benzoyl hydrazone (h2acph), 2-acetylpyridine para-chloro-benzoyl hydrazone (h2acpclph) and 2-acetylpyridine para-nitro-benzoyl hydrazone (h2acpno2ph) gave [bunsn(2acph)cl2] (1), [bunsn(2acpclph)cl2] (2), [bunsn(2acpno2ph)cl2] (3), [phsn(2acph)cl2] (4), [phsn(2acpclph)cl2] (5) and [phsn(2acpno2ph)cl2] (6) as products. among the hydrazones h2acpclph proved to be the most active against staphylococcus aureus and candida albicans. upon coordination the antibacterial activity of both tin and the hydrazones significantly increases. complexes 2 and 5 revealed to be the most active as antimicrobial agents.
Eliminating Error in the Chemical Abundance Scale for Extragalactic HII Regions
Angel R. Lopez-Sanchez,M. A. Dopita,L. J. Kewley,H. J. Zahid,D. C. Nicholls,J. Scharwachter
Physics , 2012, DOI: 10.1111/j.1365-2966.2012.21145.x
Abstract: In an attempt to remove the systematic errors which have plagued the calibration of the HII region abundance sequence, we have theoretically modeled the extragalactic HII region sequence. We then used the theoretical spectra so generated in a double blind experiment to recover the chemical abundances using both the classical electron temperature + ionization correction factor technique, and the technique which depends on the use of strong emission lines (SELs) in the nebular spectrum to estimate the abundance of oxygen. We find a number of systematic trends, and we provide correction formulae which should remove systematic errors in the electron temperature + ionization correction factor technique. We also provide a critical evaluation of the various semi-empirical SEL techniques. Finally, we offer a scheme which should help to eliminate systematic errors in the SEL-derived chemical abundance scale for extragalactic HII regions.
Page 1 /395489
Display every page Item


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