Universidade Federal Rural do Rio de Janeiro

About: Universidade Federal Rural do Rio de Janeiro is a education organization based out in Seropédica, Brazil. It is known for research contribution in the topics: Population & Species richness. The organization has 6405 authors who have published 9852 publications receiving 105911 citations.

Inheritance of root traits and phosphorus uptake in common bean (Phaseolus vulgaris L.) under limited soil phosphorus supply

Abstract: Summary Scarce information about genetic control of root traits in common bean (Phaseolus vulgaris L.) impedes a more effective exploitation of the reported variability for plant breeding. This work investigated the inheritance of traits related to the root system and P absorption of common bean grown under limited soil P supply. Two experiments were carried out, each one involving one family of crosses comprising six populations (two parental cultivars, F1, F2, and two backcrosses). One plant was grown per pot with 3 kg of soil (7 mg P kg −1 Mehlich-1) and harvested at pod setting. Root samples provided the root surface area and root length by digital image analysis. Considerable additive genotypic effects were detected in both experiments; additive × additive epistases were significant only in the second experiment, whereas dominance effects were seldom significant. Estimated broad-sense heritabilities were 0.55 and 0.51 for root area, 0.50 and 0.47 for root length, 0.51 and 0.61 for root mass, and 0.51 and 0.43 for the total P content, in the first and second experiments, respectively. High genotypic correlation between root mass and root area justifies screening genotypes based solely on root mass. Phenotypic and genotypic correlations between shoot mass and root mass, and shoot mass and total P content, were highly significant, indicating that direct selection for higher shoot growth of bean plants under limited soil P supply would result in increased root mass and P uptake. A scheme for root breeding in common bean towards improving P efficiency should include: matching cultivars with favourable alleles; advance until later generations without any selection; selection of resultant genotypes under low soil P supply via shoot growth; evaluation of promising lines for root growth and agronomic performance.

Renormalizability of the linearly broken formulation of the BRST symmetry in the presence of the Gribov horizon in Landau gauge Euclidean Yang-Mills theories

Abstract: In previous work by M. A. L. Capri, A. J. Gomez, M. S. Guimaraes, V. E. R. Lemes, S. P. Sorella, and D. G. Tedesco [Phys. Rev. D 82, 105019 (2010)], we have shown that the soft breaking of the Becchi-Rouet-Stora-Tyutin (BRST) symmetry arising within the Gribov-Zwanziger framework can be converted into a linear breaking, while preserving the nilpotency of the BRST operator. Because of its compatibility with the quantum action principle, the linearly broken BRST symmetry directly translates into a set of Slavnov-Taylor identities. We show that these identities guarantee the multiplicative renormalizability of both Gribov-Zwanziger and refined Gribov-Zwanziger theories to all orders. The known property that only two renormalization factors are needed is recovered. The nonrenormalization theorem of the gluon-ghost-antighost vertex, as well as the renormalization factor of the Gribov parameter, are derived within the linearly broken formulation.

An intra‐cultural investigation in Brazil using Coalho cheese and preferred attribute elicitation

Abstract: This study aimed to evaluate the application of preferred attribute elicitation (PAE) methodology for assessing the perceptions of consumers from different regions of Brazil (Northeast, Southeast or South, n = 20) about Coalho cheese samples. Northeast Brazilian consumers elicited a higher number of attributes (22 vs. 13–15) and had a higher frequency of consumption (3 vs. 1.3–1.6 times a week), while those from South region had higher reliability (RV = 0.95) with a low number of consumers (n = 16). Consumers from different Brazilian regions elicited common sensory descriptors considered important for Coalho cheese characterization, such as yellow color, presence of eyes, brightness, Coalho cheese aroma, salty taste, bitter taste, acid taste, and rubbery texture. Furthermore, there was no impact of the region on the acceptance of the products. In conclusion, Brazilian consumers from different regions characterized the Coalho cheeses in a similar manner, and PAE methodology could be used in intra‐cultural investigations, being recommended a minimum of 19 consumers. PRACTICAL APPLICATIONS: Consumer based methodologies are gaining popularity in the sensory and consumer science. This is the first study that evaluated the application of PAE methodology regards an intra‐cultural consumer perception using as stimulus Coalho cheese, a typical Brazilian cheese. The findings are relevant to improve the processing of the Coalho cheese taking in account the consumer perception as well as to develop efficient marketing strategies of commercialization of this product.

Use of a tropical bay in southeastern Brazil by juvenile and subadult Micropogonias furnieri (Perciformes, Sciaenidae)

Abstract: The white croaker Micropogonias furnieri is a commercially important marine fish that uses bays and other semi-closed coastal areas early in its life. A sampling programme, using beach-seine and otter trawl, was carried out in Sepetiba Bay (22°54′-23°04′S, 43°34′-44°10′W), southern Brazil, from October 1998 to September 1999, with the objective of assessing the patterns of temporal and spatial usage of the bay by white croaker during its early life. Early recruits (total length, TL, 10-50 mm) appear off beaches of the inner bay between October and December, move away from them during late summer and early autumn (January-April), and are caught by trawl offshore from May to September at a TL of 70-150 mm. From May to August, new recruits (10-50 mm) are again found inshore. Fish grow from 10-40 to 70-150 mm during the first year of life in the shallows of the bay, before moving offshore. They cross the deeper waters of the bay as they migrate towards the open ocean. Juveniles (TL 70-150 mm) are most abundant in the inner bay, and subadults (TL 150-200 mm) in the outer and central bay. M. furnieri use semi-closed coastal areas as nursery grounds, before moving out over the continental shelf, where they spawn.