Estudo comparativo do padrão de identidade e da atividade proteolítica do pescado oriundo de híbridos de Cachara e Pintado.

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CsCuCl3 perovskite-like compound under extreme conditions

Halide perovskite has attracted intense research interest owing to its multifaceted and versatile applications in optoelectronics. This intrigue is further fueled by their propensity to undergo intricate structural modifications under extreme conditions, thereby instigating property changes. Within this context, our study delves deep into the intricate interplay of structural and vibrational attributes within the inorganic-metal halide perovskite-like CsCuCl3. Our approach employs Raman spectroscopy and Synchrotron Powder X-Ray Diffraction (SPXRD) techniques harnessed under the dual conditions of low temperatures and high pressures. We have observed a distinct spin-phonon coupling mechanism by employing Raman spectroscopy at low temperatures; this coupling has been manifested as a renormalization phonon phenomenon that occurs notably at T* = 15 K. The correlation between spin and phonon dynamics becomes pronounced through a notable hardening of phonon temperature dependence, a behavior intricately linked to the material antiferromagnetic transition at TN = 10.7 K. The SPXRD under high pressure showed a first-order structural phase transition (SPT) at the critical pressure Pc = 3.69 GPa, leading to the transformation from the hexagonal P6522 to a base-centered monoclinic cell. Notably, the coexistence of both phases is discernible within the pressure range from 2.79 to 3.57 GPa, indicating that the SPT involves the reorganization of the internal [Cu2Cl9]5- dimer unit, with the Cl-Cu-Cl bending contributing more than stretching modes. Furthermore, we demonstrate that the SPT is reversible, but residual strain pressure influences the modification of the critical pressure Pc value upon pressure decrease.Comment: 27 pages, 8 figure

Eficiência de anelamento aplicado como tratamento silvicultural em florestas manejadas na Amazônia Ocidental.

O manejo florestal em florestas primárias na Amazônia é, na maioria das vezes, limitado a sistemas silviculturais baseados no diâmetro mínimo de corte (DMC) e na extração de um número relativamente pequeno de espécies, reduzindo a população de árvores comerciais. A utilização de técnicas de impacto reduzido minimiza os impactos da extração, mas não necessariamente melhoram as baixas taxas de crescimento apresentadas por muitas espécies comerciais, nem asseguram o retorno dos volumes explorados para o próximo ciclo de corte. Por outro lado, estudos conduzidos nos trópicos têm mostrado que a aplicação de tratamentos silviculturais nas árvores do futuro, como cortes de liberação, corte de cipós e anelamento de competidoras, pode aumentar significativamente suas taxas de crescimento. De todos os métodos de anelamento, aquele em que se utiliza a motosserra é provavelmente o mais barato, rápido e fácil de implementar corretamente no campo. Os objetivos deste trabalho foram: avaliar os efeitos do anelamento sobre árvores comerciais e não comerciais indesejáveis; determinar os custos e eficiência do anelamento; e estabelecer os melhores níveis de resposta ao anelamento, em relação à classe de tamanho e iluminação de copa.bitstream/CPAF-AC-2010/23017/1/cot.172.pd

Pasteurização da polpa de acerola cultivada sob sistema orgânico.

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Linearization of the Bradford protein assay to application in cow milk proteins quantification by UV-Vis spectrophotometry method.

Reliable methods for determination and quantification of total protein in food are essential information to ensure quality and safety of food trade. The objective of this study was to evaluate the linearity of calibration curves obtained from different proteins (blood serum albumin-BSA, α-LA, β-LG, caseins (CN): αs, β and κ-CAS) with the reagent of Bradford. Comercial UHT skimmed bovine milk was analyzed for the determination of total protein using the Bradford method by reading at 595 nm. The determination of the concentrations of total milk protein was achieved by linear regression. The Bradford method showed a high sensitivity for the determination of total proteins in bovine milk dilution 1:25 to values closer to those obtained by the Kjeldahl method. The results showed that the calibration curve of standard proteins β-CN and BSA obtained better linearity with less variation in the absorbance measurements for the determination of total protein of milk

Influência do tamanho do recipiente no crescimento de plantas de mangueira sob condições de campo.

Este estudo tem como objetivo avaliar sob condicao de campo, em sequeiro, o crescimento de plantas de mangueira (Mangifera indica L.) formadas em tres diferentes tamanhos de recipiente.bitstream/CNPAT-2010/5398/1/Pa-054.pd

Invasive frogs show persistent physiological differences to elevation and acclimate to colder temperatures

The coqui frog (Eleutherodactylus coqui) was introduced to the island of Hawai’i in the 1980s and has spread across much of the island. Concern remains that this frog will continue to expand its range and invade higher elevation habitats where much of the island’s endemic species are found. We determined whether coqui thermal tolerance and physiology change along Hawai’i’s elevational gradients. We measured physiological responses using a short-term experiment to determine baseline tolerance and physiology by elevation, and a long-term experiment to determine the coqui’s ability to acclimate to different temperatures. We collected frogs from low, medium, and high elevations. After both the short and long-term experiments, we measured critical thermal minimum (CTmin), blood glucose, oxidative stress, and corticosterone levels. CTmin was lower in high elevation frogs than low elevation frogs after the short acclimation experiment, signifying that they acclimate to local conditions. After the extended acclimation, CTmin was lower in frogs acclimated to cold temperatures compared to warm-acclimated frogs and no longer varied by elevation. Blood glucose levels were positively correlated with elevation even after the extended acclimation, suggesting glucose may also be related to lower temperatures. Oxidative stress was higher in females than males, and corticosterone was not significantly related to any predictor variables. The extended acclimation experiment showed that coquis can adjust their thermal tolerance to different temperatures over a 3-week period, suggesting the expansion of coqui into higher elevation habitats may still be possible, and they may not be as restricted by cold temperatures as previously thought