Error propagation used to calculate LODs for MEC and MICal in MIP OES, ICP OES and ICP-MS determinations. Best trueness and precisions found for 0.1 < calibration slope < 0.9.

No abstract

Para avaliar a prevalência de anticorpos anti- Babesia equi, através da técnica de imunofluorescência indireta (IFI), foram examinados 397 amostras de soro. As amostras de sangue, para obtenção dos soros, foram coletadas de eqüinos de diferentes idades, raças, sexos, nascidos e criados no Planalto Catarinense, dos municípios de Lages, São Joaquim, Bom Jardim da Serra, Campos Novos, Anita Garibaldi, Curitibanos e Correia Pinto. Os resultados obtidos indicaram a existência de 50,38% de animais sorologicamente reativos para B. equi, na diluição de 1:40. Entre os municípios, os percentuais de animais soropositivos variaram de 18,51% a 64,70%.

Multi-energy calibration was used to determine As, Ba, Cd, Cr, and Pb in fertilizers by MIP OES.

Woody plant resprouting has received considerable attention in the last two decades as human disturbances continue to encroach on terrestrial ecosystems globally. We examined the regeneration mechanisms of a Caatinga dry forest in the context of slash-and-burn agriculture and resprouting ability of the local flora. We excavated two old fields (from 32) experiencing early forest regeneration dominated by the tree Pityrocarpa moniliformis (Fabaceae) to map clonal propagation and, in parallel, submitted 260 seedlings from 13 woody plant species to experimental clipping. What seemed to be ‘seedlings’ popping up around P. moniliformis stumps and remaining adults actually were condensed sets of root suckers connected via complex networks of long, ramified shallow horizontal roots without taproots. We mapped respectively 39 and 783 connected root suckers, which summed 96 m and 910 m in root length. Regarding the seedlings, 33% resprouted across nine species with resprouting rates varying between 5–100%. Seedling height before clipping positively influenced resprouting vigour. Our preliminary results suggest that the Caatinga dry forest supports a relatively high proportion of resprouting species, some of them able to clonally propagate and playing an ecosystem-level role by responding to early forest regeneration and high abundance/biomass across both regenerating and old-growth forests.

Molecular species and internal standardization for direct determination of phospholipids in meat expand the use of MIP OES.

The multi-energy calibration (MEC) was evaluated for the determination of Ca, Cu, Fe, K, Mg, Na, P, S, and Zn in meat samples by inductively coupled plasma optical spectrometry (ICP OES). This calibration method consists of using only two calibration standards and several atomic and ionic emission wavelengths with different sensitivities to determine the analyte concentration in the sample. Both calibration mixtures are prepared using the same amount of sample, which contributes to minimize matrix effects. The accuracy was evaluated using two certified reference materials, bovine liver (SRM 1577c) and bovine muscle (SRM 8414), with recoveries within 87-107% range. The method was applied for the determination of the analytes in meats of chicken, sheep loin, sheep carcass and bovine, and prove to be usable in samples with different characteristics.

No abstract