Caracterización molecular y evaluación del riesgo de Listeria monocytogenes en carne de vacuno y ave

Listeria monocytogenes es un patógeno alimentario altamente letal que causa una enfermedad llamadalisteriosis. El objetivo de este trabajo fue conocer aspectos epidemiológicos de este patógeno en carnescrudas listas para la venta. Se incluyeron 91 aislados de carne de ave y vacuno y se les comparó medianteelectroforesis de campo pulsado (PFGE) con 3 cepas asociadas a casos de listeriosis humana en Chile. Serealizó además una evaluación probabilística del riesgo (EPR) de infectarse y/o enfermar por L.monocytogenes por el consumo de pollo y carne de vacuno. El modelo incluyó parámetros desde retail hastael hogar y las distribuciones se compararon mediante un Análisis de Monte Carlo incluido en el [email protected] resultados del PFGE, revelaron 2 relaciones de similitud >90% entre subtipos de aislados de carne ylisteriosis humana. Con la EPR se estimó un promedio de 228 (D.E=3.439) y 3 infectados (D.E=103) y 39(D.E=552) y 1 enfermos (D.E=13) por consumo de carne de vacuno y pollo respectivamente. Las variablesde mayor peso fueron la concentración de bacterias y la dosis infectante del 50% de la población (ID50).La carne cruda puede ser considerada como un alimento de riesgo para enfermar o infectarse con L.monocytogenes si no existe una cocción y/o manipulación adecuada. Por esto, la educación del consumidores esencial para prevenir la listeriosis por consumo de estos productos. El generar mayor informaciónnacional, sobre todo de concentración e ID50, debe ser prioridad para disminuir las incertidumbres de futurasevaluaciones de riesgo.  

On the π\pi and KK as qqˉq \bar q Bound States and Approximate Nambu-Goldstone Bosons

We reconsider the two different facets of $\pi$ and $K$ mesons as $q \bar q$ bound states and approximate Nambu-Goldstone bosons. We address several topics, including masses, mass splittings between $\pi$ and $\rho$ and between $K$ and $K^*$, meson wavefunctions, charge radii, and the $K-\pi$ wavefunction overlap.Comment: 15 pages, late

CORRUPTION AND COST OF GOVERNANCE IN NIGERIA

Nigeria is a country with great potentials. However, these potentials have been punctuated by a myriad of problems. The problems are not necessarily that of lack of resources, but of corruption and hence high cost of governance. The past and present leadership of the country recognized the ugly situation this has put the country and had devised mechanisms to stem the tide for good. The mechanisms put in place by governments in the past have not achieved the desired results. On the basis of the analysis of the political economy of the country, the paper suggested ways to solving the problem - reinforcing the current anti-corruption drive of the government by making the structures/institutions put in place to fight corruptio-n to be truly independent of the executive arm of government and promptly bringing culprits to book, and reduction in governmental units both at the state and local levels to economicalZv manageable size. These the paper argues would reduce corruption in the country and hence lower the cost of governance

Weighted ancestors in suffix trees

The classical, ubiquitous, predecessor problem is to construct a data structure for a set of integers that supports fast predecessor queries. Its generalization to weighted trees, a.k.a. the weighted ancestor problem, has been extensively explored and successfully reduced to the predecessor problem. It is known that any solution for both problems with an input set from a polynomially bounded universe that preprocesses a weighted tree in O(n polylog(n)) space requires \Omega(loglogn) query time. Perhaps the most important and frequent application of the weighted ancestors problem is for suffix trees. It has been a long-standing open question whether the weighted ancestors problem has better bounds for suffix trees. We answer this question positively: we show that a suffix tree built for a text w[1..n] can be preprocessed using O(n) extra space, so that queries can be answered in O(1) time. Thus we improve the running times of several applications. Our improvement is based on a number of data structure tools and a periodicity-based insight into the combinatorial structure of a suffix tree.Comment: 27 pages, LNCS format. A condensed version will appear in ESA 201

A ocupação agrária do Concelho de Oeiras na época romana

No Período Romano, o espaço actualmente ocupado pelo concelho de Oeiras, foi precocemente romanizado; os elementos disponíveis indicam a presença de uma população autóctone aculturada, que adoptou completamente os hábitos romanos - até na morte - logo no século I d.e.; a facilidade e rapidez deste fenómeno não é de admirar, dada a já longa convivência anterior dos habitantes da região com povos e culturas mediterrâneas, ao longo de toda a Idade do Ferro, materiais que se encontram sempre presentes nas vil/ae mais importantes.info:eu-repo/semantics/publishedVersio

Susceptibility Inhomogeneity and Non-Fermi-Liquid Behavior in Ce(Ru_{0.5}Rh_{0.5})_2Si_2

Magnetic susceptibility and muon spin rotation (\muSR) experiments have been carried out to study the effect of structural disorder on the non-Fermi-liquid (NFL) behavior of the heavy-fermion alloy Ce(Ru_{0.5}Rh_{0.5})_2Si_2. Analysis of the bulk susceptibility in the framework of disorder-driven Griffiths-phase and Kondo-disorder models for NFL behavior yields relatively narrow distributions of characteristic spin fluctuation energies, in agreement with \muSR linewidths that give the inhomogeneous spread in susceptibility. \muSR and NMR data both indicate that disorder explains the "nearly NFL" behavior observed above \sim2 K, but does not dominate the NFL physics found at low temperatures and low magnetic fields.Comment: 6 pages, 4 figures, REVTeX, submitted to Phys. Rev.

ATTAINING A BETTER PUBLIC SERVICE DELIVERY THROUGH E-GOVERNANCE ADOPTION IN NIGERIA

Governments all over the world, Nigeria inclusive desire ways to provide welfare services to citizens with fewer resources, enhance transparency and accountability of public servants. As a result, the goals of the public service in terms of enhanced service delivery come to mind. This is because it serves as the major machinery through which governmental policies are implemented. However, the public service in Nigeria has witnessed widespread criticism as it pertains to the way and manner in which services are delivered. The inability of the public service to achieve its goals has necessitated the call for reform in the public service. In this regard, e-governance seems to be the probable solution. This paper adopts the ex-post-facto research design and found that there are several barriers arising from the adoption of the usual traditional public administrative system standing against the implementation of e-governance in the public service that would have metamorphosed into better service delivery. It is in line with the above findings that the paper argues that public service delivery could be better achieved through e-governance implementation in Nigeri

Staff Indiscipline and Productivity in the Public Sector in Nigeria

The existence of various acts of indiscipline in public sector in Nigeria is a source of concern to people (managers, bureaucrats, top public/civil servants and other patriotic Nigerians). The reason is that they see such negative/ deviant behaviour, which include habitual lateness to work, loafing, buckpassing, bribery, corruption, embezzlement or misappropriation of public funds, misuse of government property as counter-productive and therefore detrimental to the accomplishment of organizational goals. This paper perceives such acts of indiscipline as the reasons for low productivity in the public sector and argues that they are curtail-able. It goes further to discuss the factors responsible of such official acts of indiscipline which characterize contemporary public organizations in Nigeria. The paper recommends that to overcome the problem of indiscipline and low productivity in the public sector, there is the need for the three tiers of government to regularize the payment of workers’ salaries and wages to increase their productivity. Furthermore, the current efforts of the Federal Government in fighting corruption should be sustaine