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Calizotti G.S.,Centro Universitario Filadelfia UniFil | Panizzi A.R.,Embrapa Trigo
Florida Entomologist | Year: 2014

Laboratory studies were conducted on the behavior and time budget of first instar nymphs of the brown-winged stink bug [Edessa meditabunda (F.) (Heteroptera: Pentatomidae)] from egg emergence to their final position adjacent to the egg shells (chorions). Results indicated that right after emergence the nymph stays on the top of each chorion for about 3 min; the mean number of chorions or eggs visited by each nymph was 7.8 before moving off the shells or eggs and positioning itself adjacent to them. The total time required for from emergence of each nymph to its final position adjacent to the chorions was ca. 25 min. All nymphs relocated from on top of the egg mass to a position in which they faced it. This behavior of moving on to the chorions or eggs and positioning adjacent to them is speculated to be related to possible acquisition of symbionts from the surfaces of the chorions and to the defense of the egg mass. Source

Amaral H.F.,Centro Universitario Filadelfia UniFil | Sena J.O.A.,State University of Maringa | Schwan-Estrada K.R.F.,State University of Maringa | Balota E.L.,Instituto Agronomico Do Parana | Andrade D.S.,Instituto Agronomico Do Parana
Revista Brasileira de Ciencia do Solo | Year: 2011

Organic cropping systems with input of fresh organic matter can modify the physical and chemical properties of soils and consequently affect their biological composition. The purpose of this study was to determine the effects of juice grape (Vitis labrusca L.) management on the soil chemical and microbial properties of a sandy-textured Oxisol. In October 2006, soil was sampled from two vineyard experiments set up in 2000, and from a neighboring forest area. The following treatments were evaluated in a 2 x 2 x 2 factorial design: (i) organic (ORG) and conventional (CONV) vineyard managements; (ii) cultivars in rootstock/graft combinations: grafts Isabel and Bordô on rootstock IAC-766 and (iii) spatial heterogeneity (row and inter-row). Based on the analyses, the vineyard soils were separated in three groups (CONV, ORG/row and ORG/inter-row), which differed from the adjacent forest area. All microbial and chemical variables, except K, were modified in the vineyards. Rootstock/graft cultivar combinations affected the N microbial biomass and basal respiration (CO 2), while P, pH, Mg, micronutrients, and C microbial biomass were influenced by spatial heterogeneity. Soil Organic C (SOC) and microbial biomass in the rows and inter-rows were higher in the organic than the conventional vineyard management. In the rows under organic management, SOC was 172 % higher, C mic 100 % and N mic 223 % than in CONV. The same was observed in inter-rows, but to a lesser extent. The most relevant factors differentiating areas by changes in soil chemical properties, mainly SOC, and in microbial biomass were mainly caused by the vineyard management and soil spatial heterogeneity. Source

Cosenza M.,Centro Universitario Filadelfia UniFil | Pereira P.F.V.,State University Londrina | Fernandes L.I.,State University Londrina | Dearo A.C.O.,State University Londrina | And 2 more authors.
Ciencia Rural | Year: 2013

The effects of lactated Ringer's solution (LRS) on fluid, electrolyte and acid-base balances were investigated in healthy horses, ewes and calves. LRS was intravenously infused in six adult horses, six adult ewes and five calves in a volume corresponding to 10% of body weight, continously during four (ewes and calves) or six (horses) hours. Venous blood and urine samples were taken before the beginning, in the middle, at the end of the infusion and two (ewes and calves) or three (horses) hours after. Blood and urine pH, blood pCO2, HCO3 - and BE, serum Na+, K+ and Cl-, and plasma TP and L lactate were measured. Na+, K+, Cl- and L lactate fractional clearance and plasma SID, AG, and Atot were calculated. In all species LRS caused hemodilution but didn't change electrolyte and acid-base balances. It was not able to increase alkali reserve. On the other hand, LRS must be considered safe for maintenance therapy with large volume infusions because it doesn't induce electrolyte imbalances. Source

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