Although a longer duration of sensory blockade was observed with perineural dexmedetomidine, a significant increase compared with the control group was not established. Other concentrations should be investigated to verify if dexmedetomidine is a useful adjuvant to local anesthetics in peripheral nerve blocks in dogs.

House dust mites (HDM) are the main source of aeroallergens worldwide, yet epidemiological differences between socioeconomic factors in association with this medical condition have not been studied in the south region of Brazil. To assess the prevalence of HDM in two socioeconomically distinct populations of patients with allergic asthma or rhinitis, the differences between samples from houses of high-income families and low-income families were analyzed. Mite samples were collected between July and December 2015, in Porto Alegre, Brazil. The HDM were Dermatophagoides pteronyssinus and Dermatophagoides farinae (Hughes; Acari: Pyroglyphidae). Also, other non-pyroglyphid house mites were identified in dust samples: Tyrophagus putrescentiae (Schrank; Acari: Acaridae), Chortoglyphus arcuatus, and Cheyletus malaccensis. Identification of species was performed through morphological keys with a stereomicroscope and a phase optical microscope. A total of 104 homes was evaluated (low-income group: n = 53; high-income group, n = 51). We found a total of 721 mites, representing 11 species, in 93 (89%) houses. In the remaining houses, no mites were found. We observed no significant differences of species composition between the groups studied. However, the number of mites was significantly higher in the low-income group (P < 0.001). D. pteronyssinus was the predominant species detected, with 286 mites (39.6%). D. farinae was not detected in any sample. Our results show that living-rooms from low-income families present higher numbers of HDM.

In this paper, we presented additional information to the description of Cheletomimus (Hemicheyletia) wellsi (Baker, 1949) (Acari: Cheyletidae) collected on Vitis vinifera L. (Vitaceae), Ruellia angustiflora (Ness) Lindau ex Rambo (Acanthaceae) from Dois Lajeados, Marques de Souza and Pantano Grande municipalities in Rio Grande do Sul state, and on Malus domestica Borkh (Rosaceae) in Campo do Tenente municipality, Paraná state, Brazil. The specimens examined presented intraspecific variations from those described previously. These variations will be discussed herein. A key to the known Brazilian species of the genus is provided.

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The South of Brazil is the largest producer of grapes, however this production is affected by climate and herbivores such as phytophagous mites. The aim of this work was to associate the mite fauna with the grape cultivars Chardonnay, BRS Lorena and hybrid cultivars rootstock Paulsen 1103, in trellising and espalier systems, in the municipalities of Bento Gonçalves and Garibaldi, Rio Grande do Sul State, Brazil. The cultivars were: Chardonnay trellis (Cl) Chardonnay espalier (Ce), BRS Lorena trellis (Ll), BRS Lorena espalier (Le) and the hybrid cultivars Paulsen rootstock 1103 (Pa). Monthly samplings were carried out from November 2016 to April 2017. Twenty plants per area were randomly sampled, from each plant three apical leaves were collected, apical, median and basal branches (60 leaves / area). In total, 6,865 mites belonging to seven families, 13 genera and 22 species were collected. The most abundant phytophagous belong to Tarsonemidae and Tenuipalpidae, the predators to Phytoseiidae and the generalists to Tydeidae and Iolinidae. The cultivars Lorena Ll was the greatest similarity (82.39%) among species mites, followed by Paulsen Pa (72.54%), Lorena Le (70.67%), Chardonnay Cl (31.79%) and Chardonnay Ce (31.48%). The highest dissimilarity among the cultivars occurred between Chardonnay Ce and Lorena Le (66.49%), followed by Chardonnay Ce, Chardonnay Cl (66.44%), Chardonnay Ce and Lorena Ll (61.49 %). Thus, there is homogeneity between the sampled cultivars and the conduction systems and the apical third of the leaves and the sampling period are important in determining the composition of the species.