Building equity from the beginning: the children and adolescents of Ibero-America

Includes bibliography

Congenital ranula: A case report

The purpose of this study was to report a case of bilateral swelling on the floor of the mouth of a 7-month-old patient. The lesion was congenital and had started to cause feeding problems. After the clinical diagnosis of ranula was made, the lesion was marsupialized. The obtained specimen was submitted for histopathological examination, which revealed an epithelial-lined cystic lesion. These results led to the final diagnosis of mucus retention cyst. After an 8-year follow-up period, the patient is in good general health with no recurrences.

Conservative management of severe intrusion in a primary tooth: A 4-year follow-up

The purpose of this report was to describe the case of an 18-month-old boy who was referred to the pediatric clinic of the School of Dentistry of Araçatuba, São Paulo State University, Araçatuba, São Paulo, Brazil, 3 days after sustaining severe trauma that led to the complete intrusion of the primary maxillary right lateral incisor, a crown fracture of the primary maxillary right central incisor without pulp involvement, and disruption of the superior labial frenum. Four months later, spontaneous re-eruption was observed in the intruded tooth and no endodontic intervention was necessary in either traumatized teeth. Four years after the trauma, a morphological change in the germ of the permanent successor was noted. Clinical follow-up and periodic radiographies are necessary after traumatic intrusion of primary teeth to monitor possible sequelae in the permanent successors.

El cambio tecnológico en la agricultura parcelaria en Colombia

Examina el mejoramiento científico y tecnológico del medio rural de Colombia en los últimos años.

La divulgación rural en Brasil: nuevos tiempos

Examina las actividades de divulgación del Brasil, que durante mucho tiempo se centraron en esferas y bienes de producción, que respondían mejor a los incentivos de fomento del gobierno federal y contribuyeron de ese modo a la concentración del ingreso, y que sólo a partir de 1974 introducen programas de producción para productores de bajos ingresos de las zonas rurales.

El uso combinado de medios de comunicación: estrategia alternativa de capacitación rural

Incluye Bibliografía

El financiamiento de la agricultura campesina: reflexiones generales

Incluye Bibliografía

Financiamiento de áreas rurales marginadas en el Ecuador

Incluye Bibliografía

Inserción de la agricultura latinoamericana en el mercado internacional: repercusiones para el desarrollo rural

Comenta algunos aspectos de la inserción en el mercado internacional de las agriculturas de la región, refiriéndose a sus repercusiones para el desarrollo rural y más específicamente para la agricultura familiar.

Las ferias del agricultor en Costa Rica

Incluye Bibliografía

Producción campesina de Honduras en rubros de exportación agrícola

Incluye Bibliografía

Servicios a pequeños productores agrícolas: financiamiento y crédito

Incluye Bibliografía

Analytical model for heterogeneous crystallization kinetics of spherical glass particles

An analytical model developed to describe the crystallization kinetics of spherical glass particles has been derived in this work. A continuous phase transition from three-dimensional (3D)-like to 1D-like crystal growth has been considered and a procedure for the quantitative evaluation of the critical time for this 3D-1D transition is proposed. This model also allows straightforward determination of the density of surface nucleation sites on glass powders using differential scanning calorimetry data obtained under different thermal conditions. © 2009 The American Ceramic Society.

Construction and test of low cost X-ray tomography scanner for physical-chemical analysis and nondestructive inspections

X-ray computed tomography (CT) refers to the cross-sectional imaging of an object measuring the transmitted radiation at different directions. In this work, we describe the development of a low cost micro-CT X-ray scanner that is being developed for nondestructive testing. This tomograph operates using a microfocus X-ray source and contains a silicon photodiode as detectors. The performance of the system, by its spatial resolution, has been estimated through its Modulation Transfer Function - MTF and the obtained value at 10% of MTF is 661 μm. It was built as a general purpose nondestructive testing device. © 2009 American Institute of Physics.