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Federal University of Roraima

Education
About: Federal University of Roraima is a based out in . It is known for research contribution in the topics: Population & Thermogravimetry. The organization has 981 authors who have published 1218 publications receiving 7849 citations. The organization is also known as: Federal University of Roraima.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors analyze mixed migration flows considering its impacts on the requests of refugee status recognition, its legal framework in the transit and destination countries and, specially, the protection to refugees.
Abstract: The paper discusses mixed migration flows considering its impacts on the requests of refugee status recognition, its legal framework in the transit and destination countries and, specially, the protection to refugees. The National States have, invariably, been treating international migration in a general way, disregarding specific and individuals elements that have motivated them. The consequence of this modus operandi is that many refugee applicants, who use the same mechanisms and routes as the so-called voluntary migrants, have disadvantages in the access to the right of recognition of their requests. Such reality have affected the debates on migratory flows in both the academy and in the refugee protection and advocacy bodies, such is the case of UNHCR and the American System developed after the Cartagena Declaration. Accordingly, based on documents from the international organizations and in the debates carried out in the Academia, the paper will analyze the mixed flows and the way these questions concerning the topic have been debated in the international arena, presenting good practices and solutions that can assure to the refugees the protection to which they are entitled.

10 citations

Journal ArticleDOI
TL;DR: Evaluation of the symbiotic effectiveness of eight strains of the Bradyrhizobium genus native to Roraima in Inga edulis plants and in vitro evaluation of the ability of these strains to fixation nitrogen-fixing bacteria were evaluated.
Abstract: Inga edulis Mart. is a leguminous tree adapted to acidic and low-fertility soils that establishes symbioses with nitrogen (N)-fixing bacteria. The identification of effective bacteria in biological N fixation may bolster the use of I. edulis in degraded or modified areas and agroforestry systems. Therefore, the aims of this study were evaluation of the symbiotic effectiveness of eight strains of the Bradyrhizobium genus native to Roraima in Inga edulis plants, and in vitro evaluation of the ability of the [...]

10 citations

Journal ArticleDOI
TL;DR: This work shows for the first time the characterization of the population of preantral follicles in the ovary of Dasyprocta leporina and describes the morphometry and the specific features of the follicle and the oocyte by using light and transmission electron microscopy.
Abstract: The aim of this study was to characterize the preantral ovarian follicular population in agoutis (D. leporina) by estimating the number of follicles at each developmental category, and also describe the morphometry and the specific features of the follicle and the oocyte by using light and transmission electron microscopy. The length of each ovary was measured using a caliper rule, longitudinally sectioned into two halves and both were immediately fixed to perform the estimation of follicular population and ultrastructural analysis. The mean (±S.E.M.) population of follicular per pair of ovary was estimated at 4419.8±532.26 and 5397.52±574.91 for right and left ovaries, respectively, but no differences were observed between them. The diameters for follicles, oocyte and nuclei were: 18.62±3.40μm, 12.28±2.37μm and 6.10±0.93μm for primordial, 23.75±5.70μm, 14.22±3.00μm and 6.70±1.24μm for primary and 88.55±17.61μm, 52.85±17.56μm and 22.33±17.61μm for secondary follicles, respectively. The most of the follicles found belonged to the primordial category (86.63%), followed by primary (13.01%) and secondary (0.35%) one. Additionally, polyovular follicles were observed in all the animals and they represented 7.51% of the total follicles counted. The ultrastructural analysis showed that the oocyte presented a central and regular nuclei, displaying a homogenous mass. Among the organelles, the mitochondria were the most abundant and the oocyte Golgi apparatus was rarely observed. In conclusion, this work shows for the first time the characterization of the population of preantral follicles in the ovary of Dasyprocta leporina. Those information will be useful for further development and adaptation of biotechniques such as germplasm cryopreservation and in vitro gametes manipulation.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the Trudinger-Moser inequality on weighted Sobolev spaces in the whole space, and for a class of quasilinear elliptic operators in radial form of the type L u : = − r − θ ( r α | u ′ ( r ) | β u �( r ) ), are constants satisfying some existence conditions.

10 citations

Journal ArticleDOI
TL;DR: In this article, the ground spin state of the Niobium clusters doped with aluminum atoms was predicted by using all-electron density functional theory with Douglas-Kroll-Hess correction.

10 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20232
20222
2021125
2020183
201992
201899