Time filter

Source Type

Caldeira I.C.,Centro Universitario Do Leste Of Minas Gerais | Luizi-Ponzo A.P.,Federal University of Juiz de fora | Esteves V.G.,Federal University of Rio de Janeiro
Plant Systematics and Evolution | Year: 2013

Spores from 19 species of the subgenus Aloma Kindb. of the moss genus Fissidens were analyzed by light and scanning electron microscopy. Aloma is the largest subgenus of Fissidentaceae and is characterized by the presence of a peristome of scariosus type. The spores of the subgenus Aloma are present in monads, size small to very small, heteropolar, plano-convex, with a proximal aperture region, and the sporoderm is formed by a perine, exine, and intine. The intine is not stratified, the exine is psilate, and the perine granulated. The ornamentation elements may occur singly or grouped on the surface of the spore. The aperture region shows irregular contours, ranging from circular to elongated, due to the weakness of the sporoderm proximal pole. The observed variations among species are related to different patterns of distribution of the sporoderm granules and nanogranules. Quantitative analysis combined with qualitative results did not allow all species of the subgenus Aloma to be distinguished. The results of this study demonstrate that the spore is a useful tool for taxonomic studies, and suggest that its characters be included in phylogenetic analyses, to assist in the reconstruction of the evolutionary history of mosses. © 2012 Springer-Verlag Wien.

Figueredo C.C.,Federal University of Minas Gerais | von Ruckert G.,Centro Universitario Do Leste Of Minas Gerais | Giani A.,Federal University of Minas Gerais
Acta Botanica Brasilica | Year: 2016

Conservational studies of the threatened Atlantic Forest biome are frequently restricted to terrestrial ecosystems. We know little about the water bodies, specially considering that this biome covers the third largest system of lakes in Brazil. Some of these lakes are located inside the protected “Rio Doce State Park”, but many others are found outside this reserve. These external lakes are seldom studied, but understanding their response to human activities is essential for the conservation and the protection of the lakes inside the Park. We evaluated the effects of degradation in a lake outside the Park, which shows a constant bloom of the toxic invasive cyanobacteria Cylindrospermopsis raciborskii. Phytoplankton, climate and physico-chemical variables were assessed from 2011 to 2013 to evaluate which were the major determinants of the lake dynamics. Despite the seasonal changes, the lake was always eutrophic, and cyanobacteria, transparency and nutrients were the major indicators of water characteristics. The lake seems to be nitrogen-limited and cyanobacteria were negatively correlated withnitrogen levels, since the constantly dominant C. raciborskii is a superior competitor for N. We suggest that the monitoring of nitrogen levels is fundamental to establish management strategies to avoid harmful algae blooms in this Atlantic Forest lake. © 2016, Sociedade Botanica do Brasil. All rights reserved.

Barbosa S.P.,Centro Universitario Do Leste Of Minas Gerais | Elizeu T.S.,Centro Universitario Catolico Do Leste Of Minas Gerais | Penna C.M.M.,Federal University of Minas Gerais
Ciencia e Saude Coletiva | Year: 2013

The term access is understood from the perspective of admission or entry into the system, related to the use of the system. This research seeks to analyze access to primary health care from the perspective of professionals in family health teams of three municipalities in the State of Minas Gerais: Ipatinga, Coronel Fabriciano and Santana do Paraíso. This work is a qualitative case study into the understanding of access on the part of professionals in family health teams. Twelve health professionals from different professional categories participated in the study. The data was collected through taped and subsequently transcribed interviews and analyzed using Bardin's content analysis technique. As a result the professionals showed that they believe that it is possible to improve working conditions and consequently the supply of services. The type of care and the inherent complexity make a difference in waiting time and the ability of the system to respond thereby impacting the quality of access. Professionals in the municipalities of Coronel Fabriciano and Santana do Paraíso consider the service to be organized and decisive. However, in the municipality of Jaipur, there is high management turnover that hampers the organization of the service and the smooth operation of flows and routines.

Pivari M.O.,Federal University of Minas Gerais | De Oliveira V.B.,Centro Universitario Do Leste Of Minas Gerais | Costa F.M.,National Institute of Amazonian Research | Ferreira R.M.,Centro Universitario Belo Horizonte | Salino A.,Federal University of Minas Gerais
Rodriguesia | Year: 2011

This paper refers to aquatic flora species composition and distribution in protected and surrounding areas located in the Rio Doce valley lakes, Minas Gerais state, the third largest Brazilian lacustrine system. Data were collected from previous works, herbaria collections and field samplings done between 2007 and 2010 in aquatic environments located within and around the Parque Estadual do Rio Doce (PERD). We recorded 184 aquatic macrophyte species in different taxonomic groups, habits and life forms. In this study we propose the creation of a new life-form category, "embalsada", applied to plants established on floating meadows. This work contributed 152 new records for the Rio Doce valley in Minas Gerais, two of which were new to the state and one undescribed species. A floristic similarity characterization between protected and surrounding areas indicated that PERD protects 74% of all aquatic macrophyte species found. However, we found that 26% of all species are unsafe because they do not occur in this conservation unit.

De Alcantara F.L.,Aperam S.A | Barbosa R.A.N.M.,Federal University of Minas Gerais | Da Cunha M.A.,Centro Universitario Do Leste Of Minas Gerais
ISIJ International | Year: 2013

A fine dispersion of precipitates is a key requirement in the manufacturing process of Fe-3%Si grain oriented electrical steel. In the production of high permeability grain oriented steel precipitate particles of copper and manganese sulphides and aluminium nitride delay normal grain growth during primary recrystallization, causing preferential growth of grains with Goss orientation during secondary recrystallization. The sulphides precipitate during the hot rolling process. The aluminium nitride particles are formed during hot rolling and the hot band annealing process. In this work AlN precipitation during hot deformation of a high permeability grain oriented 3%Si steel is examined. In the study, transfer bar samples were submitted to controlled heating, compression and cooling treatments in order to simulate a reversible hot rolling finishing. The samples were analyzed using the transmission electron microscope (TEM) in order to identify the precipitates and characterize size distribution. Precipitate extraction by dissolution method and analyses by inductively coupled plasma optical emission spectrometry (ICP-OES) were used to quantify the precipitation. The results allowed to describe the precipitation kinetics by a precipitation-timeerature (PTT) diagram for AlN formation during hot rolling. © 2013 ISIJ.

Discover hidden collaborations