Mato Dentro Research Articles

Simulations of Vertimill Pilot Scale tests for Itabirite

The Minas-Rio Project is the biggest project from Anglo American in the world and considers Vertimill in the regrinding circuit to adequate the particle size distribution to feed slurry pipeline that will pump the ore from Conceição do Mato Dentro in Minas Gerais State to Acu Port in Rio de Janeiro State, Brazil. A Vertimill pilot test campaign was carried out at Metso's pilot plant facility located in York city, Pennsylvania State, USA, to provided information to sizing the industrial grinding circuit. The main objective of this work is proposing a way to simulate the industrial Vertimill using the population balance model, normally used to simulate ball mills. The simulations were based on the selection and breakage functions determined from the laboratory tests using a batch ball mill. The simulations were performed using a Vertimill model implemented in the ModsimTM plant-wide simulator. The results of simulations shows that was possible to simulate the pilot tests, with good accuracy, considering simple laboratory tests with small quantities of samples.

A new family of Gonyleptoidea from South America (Opiliones, Laniatores)

A new family of Laniatores, Gerdesiidae fam. nov., is proposed based on molecular and morphological evidence. Data also indicate that this new family is the sister family of Tricommatidae. Gerdesiidae fam. nov. has a disjunct distribution, occurring in northern South America (Peru, Brazilian Amazon) and at a spot in south-eastern Brazil (Minas Gerais State). The new family is composed of two genera: Gerdesius Roewer, 1952 (type genus) and Gonycranaus gen. nov. (type species Gonycranaus androgynus sp. nov.). We propose the synonymy of Huralvioides H. Soares, 1970 with Gerdesius Roewer, 1952 based on molecular and morphological evidence. Three new species are described: Gerdesius mapinguari sp. nov. (type locality: Brazil, Amazonas, Manaus, Reserva Km 41); Gonycranaus androgynus sp. nov. (type locality: Brazil, Minas Gerais, Conceicao do Mato Dentro); and an obligate cave-dwelling species, Gonycranaus pluto sp. nov. (type locality: Brazil, Minas Gerais, Morro do Pilar). © 2015 The Linnean Society of London

Avaliação lectino-histoquímica de fígado e rim de ovinos com fotossensibilização causada por Brachiaria decumbens

Embora sejam as forrageiras mais importantes para a pecuária de corte (bovinocultura de corte) no Brasil, em certas épocas ou condições, Brachiaria spp. podem ser tóxicas e causar surtos de fotossensibilização hepatógena que determinam significativas perdas econômicas. Animais que se alimentam em pastos de Brachiaria spp. comumente apresentam macrófagos espumosos isolados ou agrupados, além de cristais no interior de ductos biliares. Saponinas esteroidais têm sido identificadas nestes cristais e são responsabilizadas por lesar o fígado levando ao acúmulo de filoeritrina. Por vezes, imagens negativas desses cristais podem estar presentes no citoplasma de macrófagos espumosos. A patogênese de formação e o tipo de material armazenado nas células espumosas ainda são desconhecidos. A técnica de lectino-histoquímica visa auxiliar na detecção desses macrófagos e, consequentemente, no diagnóstico, além de identificar quais os resíduos de açúcares específicos que estão presentes no citoplasma das células espumosas. Assim, este trabalho teve por objetivo identificar quais lectinas são mais indicadas na detecção de saponinas esteroidais no fígado e rim de ovinos com fotossensibilização causada por Brachiaria decumbens. Fragmentos de fígado e rim de quinze ovinos, de ambos os sexos e idade variável, oriundos de Conceição do Mato Dentro, Minas Gerais, e um ovino mantido em pastagem livre de Brachiaria spp. foram avaliados pela técnica de lectino-histoquímica. Quatorze lectinas foram utilizadas (Con-A, DBA, SBA, PNA, SJA, RCA-I, UEA-I, WGA, SWGA, GSL, PSA, PHA-L, PHA-E e LCA). Verificou-se que, no fígado de ovinos com fotossensibilização provocada pela ingestão de Brachiaria decumbens, a lectina PNA apresentou especificidade e acentuada reatividade aos macrófagos espumosos, bem como especificidade e leve reatividade aos hepatócitos; a lectina WGA teve especificidade e moderada reatividade aos macrófagos espumosos do fígado e especificidade e leve reatividade aos hepatócitos; e as lectinas SBA, GSL e LCA apresentaram especificidade e moderada reatividade aos macrófagos espumosos, entretanto, não foram específicas para hepatócitos. No rim dos ovinos, a lectina PNA foi a que apresentou maior reatividade. Avaliações lectino-histoquímicas ainda não haviam sido realizadas em fígado e rim de ovinos com fotossensibilização provocada por Brachiaria spp.

<p><strong><em>Vochysia microphylla</em></strong><strong> (Vochysiaceae), a new species from Serra do Cipó, Minas Gerais, Brazil</strong></p>

Vochysia microphylla is described and illustrated as a new species. It belongs to Vochysia section Ciliantha subsection Lutescentes . This new species is apparently endemic to the “campos rupestres” vegetation in Morro do Pilar and Itambe do Mato Dentro, Serra do Cipo, Minas Gerais, Brazil.

Amphibia, Anura, Hylidae, Scinax cardosoi (Carvalho-e- Silva and Peixoto, 1991): distribution extension

We report the geographical distribution extension of Scinax cardosoi to the central region of the State of Minas Gerais, at Espinhaço Mountain Range. During field work in November and December 2009 at the Municipality of Conceição do Mato Dentro, we collected some S. cardosoi specimens associated to temporary ponds, near to permanent streams in open and forested areas, in a transitional area of Atlantic Forest and Cerrado domains. The present record extends the distribution of S. cardosoi ca. 333 km from the other record of this species in the State of Minas Gerais.

Levantamento de Parasitos Intestinais nas Áreas Urbana E Rural de Itambé do Mato Dentro, Minas Gerais, Brasil

In order to evaluate the distribution of intestinal parasites in Itambe do Mato Dentro (central region of Minas Gerais) and to compare data of the urban area to those of rural districts of the municipality, an analysis of stool parasitological tests was carried out. Between July 2005 and February 2007, results of 817 patients tested using the sedimentation method were obtained. It was verified that 33.2% of tests were positive and more than one species of parasites were observed in 8.1% of cases. The occurrence of intestinal parasites in rural areas (39.5%) was significantly higher (p <0.05) than in urban areas (24.3%).

Pregnancy is associated with psychiatric symptoms in a low-income countryside community of Brazil

BackgroundPsychiatric symptoms during pregnancy induce an increase in morbidity and also in the mortality levels among women and children. However, the real association between pregnancy and psychiatric disorders and the peculiarities of the phenomenology of symptoms in underprivileged countryside communities remain uncertain.ObjectiveTo verify the association between psychiatric disorder, symptoms, and pregnancy among women from a low-income countryside community and to determine the specific cutoff points for major depression diagnosis according to Beck Depression Inventory for the different trimesters of pregnancy in this population.MethodsNinety-four pregnant women and 38 healthy women from the Conceição do Mato Dentro health service, a rural low-income community in Brazil, participated in the present study. Psychiatric examination included a structured clinical interview for psychiatric disorders according to Mini International Neuropsychiatric Interview and psychometric scales such as the Yale–Brown Obsessive Scale, the Beck Depression Inventory, and the Hamilton Anxiety Scale. The cutoff points for Beck Depression Inventory were determined through the application of receiver operating characteristic curves considering the diagnosis of major depression according to Mini International Neuropsychiatric Interview.ResultsThe pregnant women had a higher frequency of psychiatric disorders and depression and anxiety symptoms. All cutoff points of Beck Depression Inventory were equal or higher than 12 with high sensitivity and specificity. Although the modified cutoff was selected based on both high sensitivity and high specificity, they were lower than when the cutoff was applied to nonpregnant women.ConclusionPregnancy was associated with the occurrence of psychiatric disorders and depressive and anxiety symptoms. In comparison to the literature, the present results indicate that there are different cutoff points in the Beck Depression Inventory for pregnant women from different cultures and in different pregnancy trimesters.

Paisagem e itinerários turísticos na Serra do Espinhaço Meridional - eixo Ipoema-Itambé do Mato Dentro, Minas Gerais

This article's purpose's to show the concretes and subjectives, fisics and culturals landscape's characteristics identified along of the road that connect the Ipoema-MG's district and the Itambé do Mato Dentro's city, cross the Senhora do Carmo-MG's district, and the observations places fixed along this touristic route, and also the possibilities of landscapes' reading and interpretation at this ones.

Diversity and structure of the tree community of a fragment of tropical secondary forest of the brazilian Atlantic Forest domain 15 and 40 years after logging

Two adjacent tracts of tropical secondary forest, situated in Itambe do Mato Dentro, south-eastern Brazil, which had been regenerating for 15 and 40 years after clearing, were compared with the purpose of detecting differences in species diversity and composition, species guild composition (regeneration, stratification and dispersion), and stand structure. Four and three 1,125 m2 plots laid on the 15- and 40-year-old stands, respectively, sampled 2,430 trees with diameter at the base of the stem > 5 cm. The number of species (S = 199) was high for this forest type and significantly higher for the older stand. Tree density was significantly higher in the younger stand, particularly for smaller trees, whereas the two stands did not differ in both basal area and volume per hectare. Trees of shade-tolerant and understory species were significantly more abundant in the older stand. Though sharing a large proportion of species (49%), the two stands differed significantly in the abundance of many species. Live stumps probably contributed to the relatively quick restoration of some forest characteristics, particularly species diversity, basal area and volume.

Redescoberta de Panicum brachystachyum Trin. (Poaceae) na Cadeia do Espinhaço, Minas Gerais, Brasil

Panicum brachystachyum, a Poaceae species previously thought to be extinct was rediscovered in the Parque Natural Municipal Ribeirão do Campo, Conceição do Mato Dentro, Minas Gerais, Brazil. A redescription and an illustration of the species are presented, emphasizing the rhizomatous habit and caryopsis, aspects not to be found in the literature. The hypothesis of this species being endemic in the Serra do Cipó region is strengthened.&#x0D; Keywords: Panicum brachystachyum, Paniceae, Poaceae, Espinhaço Range, Brazil.

TECTÔNICA DE NAPPES NA REGIÃO DE OURO FINO, CONCEIÇÃO DO MATO DENTRO, MG

The region around the District of Ouro Fino (Conceição do Mato Dentro, MG) is located on the southeastern border of the Espinhaço mountain range, where granite-gneissic (Basal Complex) and low grade metasedimentary rocks can be found (Metasedimentary Sequences I and II). Fine to coarse clastic rocks (phyllites, quar tzites, metacon glomerates) dominate in these sequences. Basic metavolcanic rocks are less frequent. The rocks in this region are intensively deformed showing a strong tangencial, with mass transport from east to west shown by the general recronic structures, syn-mylonitic foliation parallel to S 0 and also by smaller structures like pressure shadows, grain rotation, S and C surfaces, stretching Iineation, among others. The type of the deformation is non-coaxial and heterogeneous. The tectonic stacking of similar stratigraphic uniti es, individualized by slices of gneissic mylonitic rocks, charac terize structures fonned by nap pe- tectonics.

ESTUDO DA DEFORMAÇÃO EM METAVULCANITOS ÁCIDOS DA SERRA DO SAPO, CORDILHEIRA DO ESPINHAÇO MERIDIONAL, MG

The region of Conceicao do Mato Dentro and Serro is characterized by the presence of polydeformed porphyritic metarhyolites and metarhyodacites wich are imbricated within the tectonic framework of the Southern Espinhaco Range. In these occur a sub parallel mylonitic foliation and an intense estretching lineation. The non-coaxial aspect of the deformation is distinguished by the generalized assymetry of some deformed elements(fi.e., the assymetric pressure shadows and the S-C structural planes). Such structural features permit the assumption of crustal shearing responsable for the ridge structure.

ESTUDO DA DEFORMAÇÃO EM METAVULCANITOS ÁCIDOS DA SERRA DO SAPO, CORDILHEIRA DO ESPINHAÇO MERIDIONAL, MG

The region of Conceição do Mato Dentro and Serro is characterized by the presence of polydeformed porphyritic metarhyolites and metarhyodacites wich are imbricated within the tectonic framework of the Southern Espinhaco Range. In these occur a sub parallel mylonitic foliation and an intense estretching lineation. The non-coaxial aspect of the deformation is distinguished by the generalized assymetry of some deformed elements(fi.e., the assymetric pressure shadows and the S-C structural planes). Such structural features permit the assumption of crustal shearing responsable for the ridge structure.