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Alternativas al método de extracción Mehlich-I para estimar la necesidad de P en suelos guatemaltecos
Hunsaker-Alcantara,Heather M; Von D,Jolley; Bruce L,Webb; Phil S,Allen; Horrocks,R. D; Coronel,Eric Gabriel; Bueso C,M. L;
Agronomía Tropical , 2010,
Abstract: lack of accessibility and cost of soil analysis in both developed and developing countries reduce the effectiveness of fertilizers, and insufficient funds promote the use of soil analysis procedures with minimal validation. of the many potential methods for p extraction and analysis, five of them are promising, but is needed further research to improve validation. a survey study was done at 26 farmer-field locations (multiple sites study) and three controlled studies were performed with identical fertilizer treatments (soil incubation, greenhouse, and field). in the multiple sites study, phw (pressurized hot water) and olsen extractable p positively related to maize yield (r=0.60 and 0.75, respectively), but relationships of mehlich-i and bray-i extractable p to yield were negative (r=-0.83 and -0.74, respectively). in the greenhouse study, yield, vegetative p concentration and the total p absorption were effectively predicted by all five methods. in the controlled field experiment, grain yield did not improve with p application, but leaf p content related to extractable p for all but the mehlich i extraction method (r2 from 0.57 to 0.70). extractable p was least related to p application rate with mehlich i (r2 of 0.51 compared to 0.96 to 0.99 with other extraction methods). overall the studies, the phw and olsen methods were similar and most effective, the bray-1 and mehlich-iii methods were less consistent, and the mehlich-i method was the least consistent of the five extraction methods tested
Pros and Cons of Ion-Torrent Next Generation Sequencing versus Terminal Restriction Fragment Length Polymorphism T-RFLP for Studying the Rumen Bacterial Community
Gabriel de la Fuente, Alejandro Belanche, Susan E. Girwood, Eric Pinloche, Toby Wilkinson, C. Jamie Newbold
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0101435
Abstract: The development of next generation sequencing has challenged the use of other molecular fingerprinting methods used to study microbial diversity. We analysed the bacterial diversity in the rumen of defaunated sheep following the introduction of different protozoal populations, using both next generation sequencing (NGS: Ion Torrent PGM) and terminal restriction fragment length polymorphism (T-RFLP). Although absolute number differed, there was a high correlation between NGS and T-RFLP in terms of richness and diversity with R values of 0.836 and 0.781 for richness and Shannon-Wiener index, respectively. Dendrograms for both datasets were also highly correlated (Mantel test = 0.742). Eighteen OTUs and ten genera were significantly impacted by the addition of rumen protozoa, with an increase in the relative abundance of Prevotella, Bacteroides and Ruminobacter, related to an increase in free ammonia levels in the rumen. Our findings suggest that classic fingerprinting methods are still valuable tools to study microbial diversity and structure in complex environments but that NGS techniques now provide cost effect alternatives that provide a far greater level of information on the individual members of the microbial population.
Dust-Corrected Colors Reveal Bimodality in AGN Host Galaxy Colors at z~1
Carolin N. Cardamone,C. Megan Urry,Kevin Schawinski,Ezequiel Treister,Gabriel Brammer,Eric Gawiser
Physics , 2010, DOI: 10.1088/2041-8205/721/1/L38
Abstract: Using new, highly accurate photometric redshifts from the MUSYC medium-band survey in the Extended Chandra Deep Field South (ECDF-S), we fit synthetic stellar population models to compare AGN host galaxies to inactive galaxies at 0.8 < z < 1.2. We find that AGN host galaxies are predominantly massive galaxies on the red sequence and in the green valley of the color-mass diagram. Because both passive and dusty galaxies can appear red in optical colors, we use rest-frame near-infrared colors to separate passively evolving stellar populations from galaxies that are reddened by dust. As with the overall galaxy population, ~25% of the `red' AGN host galaxies and ~75% of the `green' AGN host galaxies have colors consistent with young stellar populations reddened by dust. The dust-corrected rest-frame optical colors are the blue colors of star-forming galaxies, which implies that these AGN hosts are not passively aging to the red sequence. At z~1, AGN activity is roughly evenly split between two modes of black hole growth: the first in passively evolving host galaxies, which may be heating up the galaxy's gas and preventing future episodes of star formation, and the second in dust-reddened young galaxies, which may be ionizing the galaxy's interstellar medium and shutting down star formation.
Computer-Generated Holographic Optical Tweezer Arrays
Eric R. Dufresne,Gabriel C. Spalding,Matthew T. Dearing,Steven A. Sheets,David G. Grier
Physics , 2000, DOI: 10.1063/1.1344176
Abstract: Holographic techniques significantly extend the capabilities of laser tweezing, making possible extended trapping patterns for manipulating large numbers of particles and volumes of soft matter. We describe practical methods for creating arbitrary configurations of optical tweezers using computer-generated diffractive optical elements. While the discussion focuses on ways to create planar arrays of identical tweezers, the approach can be generalized to three-dimensional arrangements of heterogeneous tweezers and extended trapping patterns.
Evaluation of sexual dimorphism by discriminant function analysis of toe length (1T–5T) of adult Igbo populace in Nigeria
Blessing C. Didia,Eric O. Aigbogun, Jr.,Gabriel Sunday Oladipo,Stephen A. Alabi
- , 2016, DOI: 10.4103/0300-1652.188351
Abstract: Sex determination is an important and one of the foremost criteria in establishing the identity of an individual, and this is achieved by investigating various anatomical structures to establish sex discriminatory features. The present study conducted baseline data for the toe with a view of finding discriminatory sex characteristics
Breast Pain: Clinical Pattern and Aetiology in a Breast Clinic in Eastern Nigeria
Eric C Ihekwoaba,Gabriel U Chianakwana,Ochonma A Egwuonwu,Stanley NC Anyanwu
- , 2016, DOI: 10.4103/1117-6806.169822
Abstract: Patients with breast pain are likely to be very worried because some consider pain in the breast as an indication of malignancy
Identification of a Core Bacterial Community within the Large Intestine of the Horse
Kirsty Dougal, Gabriel de la Fuente, Patricia A. Harris, Susan E. Girdwood, Eric Pinloche, C. Jamie Newbold
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077660
Abstract: The horse has a rich and complex microbial community within its gastrointestinal tract that plays a central role in both health and disease. The horse receives much of its dietary energy through microbial hydrolysis and fermentation of fiber predominantly in the large intestine/hindgut. The presence of a possible core bacterial community in the equine large intestine was investigated in this study. Samples were taken from the terminal ileum and 7 regions of the large intestine from ten animals, DNA extracted and the V1-V2 regions of 16SrDNA 454-pyrosequenced. A specific group of OTUs clustered in all ileal samples and a distinct and different signature existed for the proximal regions of the large intestine and the distal regions. A core group of bacterial families were identified in all gut regions with clear differences shown between the ileum and the various large intestine regions. The core in the ileum accounted for 32% of all sequences and comprised of only seven OTUs of varying abundance; the core in the large intestine was much smaller (5-15% of all sequences) with a much larger number of OTUs present but in low abundance. The most abundant member of the core community in the ileum was Lactobacillaceae, in the proximal large intestine the Lachnospiraceae and in the distal large intestine the Prevotellaceae. In conclusion, the presence of a core bacterial community in the large intestine of the horse that is made up of many low abundance OTUs may explain in part the susceptibility of horses to digestive upset.
Corrigendum to “Community-Acquired Cavitary Pseudomonas Pneumonia Linked to Use of a Home Humidifier”
Camille Hamula,Colleen Beckford,Daniel Caplivski,David Lin,Deena R. Altman,Eric Bressman,Eric C. Woods,Gabriel M. Cohen,Harm van Bakel,Mitchell Sullivan,Nathalie E. Zeitouni
- , 2018, DOI: 10.1155/2018/6548482
Abstract: In the article titled “Community-Acquired Cavitary Pseudomonas Pneumonia Linked to Use of a Home Humidifier” [1], the names of the first and the second authors were given incorrectly as Eric Woods and Gabriel Cohen. The authors' names should have been written as Eric C. Woods and Gabriel M. Cohen. The revised author list is shown above
A mathematical formulation of the random phase approximation for crystals
Eric Cances,Gabriel Stoltz
Physics , 2011, DOI: 10.1016/j.anihpc.2012.05.004
Abstract: This works extends the recent study on the dielectric permittivity of crystals within the Hartree model [E. Cances and M. Lewin, Arch. Rational Mech. Anal., 197 (2010) 139--177] to the time-dependent setting. In particular, we prove the existence and uniqueness of the nonlinear Hartree dynamics (also called the random phase approximation in the physics literature), in a suitable functional space allowing to describe a local defect embedded in a perfect crystal. We also give a rigorous mathematical definition of the microscopic frequency-dependent polarization matrix, and derive the macroscopic Maxwell-Gauss equation for insulating and semiconducting crystals, from a first order approximation of the nonlinear Hartree model, by means of homogenization arguments.
Testing randomness of spatial point patterns with the Ripley statistic
Gabriel Lang,Eric Marcon
Statistics , 2010,
Abstract: Aggregation patterns are often visually detected in sets of location data. These clusters may be the result of interesting dynamics or the effect of pure randomness. We build an asymptotically Gaussian test for the hypothesis of randomness corresponding to a Poisson point process. We first compute the exact first and second moment of the Ripley K-statistic under the homogeneous Poisson point process model. Then we prove the asymptotic normality of a vector of such statistics for different scales and compute its covariance matrix. From these results, we derive a test statistic that is chi-square distributed. By a Monte-Carlo study, we check that the test is numerically tractable even for large data sets and also correct when only a hundred of points are observed.
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