Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Canine atopic dermatitis (CAD) is a multifactorial, allergic and inflammatory skin disorder with a genetic predisposition manifested by clinical signs, and it is generally associated with the production of specific IgE antibodies, mainly against environmental allergens. The objective of this study was to report the occurrence of mecA gene in an isolate of Staphylococcus sp. from a dog with canine atopic dermatitis and recurrent pyoderma. Clinical specimen was collected for culture and antimicrobial susceptibility analysis. The isolate of Staphylococcus was then submitted to PCR for the detection of the mecA gene. The isolation of Staphylococcus sp. from this patient’s skin is worrisome, since the presence of such multi-resistant bacterium in such circumstance is a potentially grave risk for public health.

Soils with low levels of organic matter and high compaction limit agricultural productivity and may compromise the sustainability of ecosystems (e.g., Amazonian). Only few studies show the effect of land use and soil management systems in the Amazon region, which hinders the understanding of this effect on this ecosystem. Therefore, the objective was to evaluate the effect of land use and soil management systems on physical attributes and on the carbon stock of an Oxisol in the Amazon. Evaluations were performed at 0-10, 10-20, 20-30 and 30-40 cm of soil subjected to the use and management systems: minimum tillage, conventional tillage, native pasture and native forest. The highest densities were observed in the soil area of Brachiaria brizantha implanted after conventional tillage and native pasture area. The highest levels of total organic carbon and the largest stocks of carbon in the soil were found in forest area, and B. brizantha was established after minimum tillage, at 0-10 cm depth. Therefore, the minimum tillage is the most indicated land use and soil management system to introduce B. brizantha in the Amazon.  

Inadequate management of irrigated soils results in degradation by salinization and sodicity; therefore, the knowledge of their chemical properties, for the adoption of efficient correction techniques is necessary. Thus, this research aims to identify the variation of the chemical properties of saline soils and verify the effect of sulfuric acid on these attributes and initial growth of algaroba [Prosopis juliflora (SW) DC]. The samples of soil used were collected at the São Gonçalo Irrigated Perimeter and sent to the laboratory for chemical characterization. The correlation between PST and CE, pH, Ca2+ and Mg2+ was studied. In the next step, an experiment was carried out on the Prosopis juliflora species, applying four increasing doses of H2SO4 (0, 2, 4, 6 ml/kg soil), with three replicates. Soils were sampled (100 g vaso-1) for pH determination and extraction of P contents using two extractors: Mehlich-1 and Olsen. The chemical attributes in the irrigated area presented high spatial variability, and the application of H2SO4 doses in the soil provided a reduction of pH and uneven growth of Prosopis juliflora.

The understanding of relationships between insects and host plants at their trophic levels is one of the greatest challenges to the ecological field. The objective of this study was to identify the influence of host plant species and clump diameters on the population density of phytophagous pentatomids. The study was carried out during the soybean and maize off-season in 2014, 2015 and 2016 at the Experimental Area of the University of Cruz Alta, Cruz Alta, RS. Host plants with different clump diameters of the species Chloris distichophylla (5, 10, 15, 20, and 25 cm), Andropogon bicornis, and Erianthus angustofolium (10, 20, 30, 40, and 50 cm) were evaluated. For each diameter of each plant species 10 experimental units were sampled per year, totaling 150 experimental units of each plant species at the end of three years. The diameter of host plant has direct influence on the phytophagous pentatomids. No significant differences were found among the host plants at the end of the three years of evaluations for the population of phytophagous Pentatomids.

PÁGINAS INICIAIS V60 N3

SUMÁRIO RCA V60 N 3

AVALIADORES V60 N3

DIRETRIZES V60 N3

Given the economic importance of eucalyptus (Eucalyptus urograndis) to Brazil and the influence of boron on this crop, he objective of this study was to evaluate the effect of doses and forms of boric acid application on the initial development of newly transplanted eucalyptus seedlings. The experiment was carried out in greenhouse, in plastic containers with a capacity of 10 L of soil. The experimental design was completely randomized (DIC) in a 2 × 5 factorial scheme with four replications, the two forms of application (via boric acid leaf containing extract of the seaweed Ascophyllum nodosum and via soil with boric acid) and five doses of boron (0, 0.39, 0.77, 1.54 and 3.08 mg L-1). At 45 days after transplanting, biometric evaluations and root, stem and leaf sampling were performed to determine B. It was observed that the boron content in the leaves and stem of the eucalyptus increased linearly until the highest dose of B, without symptom of phytotoxicity. The application of B via soil at the dose of 1.54 mg L-1 is more efficient than the foliar application because it provides a higher leaf content of the nutrient. However, foliar fertilization of B + algae extract provided foliar B contents within nutrient sufficiency ranges for eucalyptus, and did not differ from fertilization via soil at other doses. The doses and forms of application of B do not differ in relation to the height, collection diameter and dry mass of the eucalyptus seedlings.

Radish (Raphanus sativus L.) is a short cycle crop, providing rapid economic return to the producer. For its appropriate cultivation, the definition of aspects related to the field implantation, the choice of the ideal crop spacing combined with the density of plants per hole, and the understanding of its effects on the physiology of the crop, help to obtain maximum productive efficiency. Thus, this study sought evaluate the physiological performance of radish plants subjected to different spatial arrangements between plants and plant density per hole. For such, an experiment using a randomized block design was conducted, with four replicates, in a 4 × 2 factorial scheme. The first factor was composed of four different plant spacings (0.05; 0.10; 0.15; 0.20 m) and the second by two cultivation densities (one and two plants per hole). Internal CO2 concentration, transpiration, stomatal conductance, liquid photosynthesis, ratio between environment and internal CO2 concentration, instantaneous carboxylation efficiency, gross photosynthesis, chlorophyll and leaf area were evaluated. The density of two plants per hole, combined with larger spacings were the combinations that provided the highest liquid photosynthesis and chlorophyll values for the plants. The density of one plant per hole combined with 0.05 to 0.15 m spacings between plants were the ones that enabled higher crude photosynthesis and fresh mass of tubers values. The density of one plant per hole and 0.05 m spacing enabled higher mean productivity values and is the most suitable for radish cultivation.