Encontrados 54 documentos, a visualizar página 1 de 6
A Rheological Model for Cupuassu (Theobroma grandiflorum) Pulp at Different Con...
Chaves, M.A.; Baptista, F.J.; Silva, J.N.; Rodrigues, L.; Viana, A.D.This work was made aiming at studying the best model for the rheological properties of Cupuassu (Theobroma grandiflorum, Schum) pulps with 14 (in nature), 17, 19, 23 and 25°Brix of total soluble solids (TSS) which were me asured at 20, 30, 40, 50 and 60°C temperature using a conc entric cylinder rheometer. The results were adjusted to the following nine models: Ostwald-de-Waele (power law), Bingham, Casson, Gen...
Cork oak (Quercus suber L.) seedlings acclimate to elevated
Vaz. M; Cochard. H; Gazarini. L; Graça. J; Chaves. M. M; Pereira. J. SLeaf gas-exchange, leaf and shoot anatomy, wood density and hydraulic conductivity were investigated in seedlings of Quercus suber L. grown for 15 months either at elevated (700 lmol mol-1) or normal (350 lmol mol-1) ambient atmospheric CO2 concentrations. Plants were grown in greenhouses in a controlled environment: relative humidity 50% (±5), temperature similar to external temperature and natural light condi...
Calibration and validation of SALTMED model under dry and wet year conditions u...
Silva, L.L.; Ragab, R.; Duarte, I.; Lourenço, E.; Simões, N.; Chaves, M.M.The SALTMED model is one of the few available generic models that can be used to simulate crop growth with an integrated approach that accounts for water, crop, soil, and field management. It is a physically based model using the well-known water and solute transport, evapotranspiration, and water uptake equations. In this paper, the model simulated chickpea growth under different irrigation regimes and a Medit...
Inter-annual variations of macrobenthic communities over three decades in a lan...
Correia, M.J.; Costa, J.L.; Chainho, P.; Félix, P.M.; Chaves, M.L.; Medeiros, J.P.; Silva, G.; Azeda, C.; P. Tavares, P.; Costa, A.; Costa, A.M.Santo André is an enclosed brackish water coastal lagoon with temporary connections to the sea by a man-made channel. The exchange and mixture of saltwater and freshwater is irregular and the lagoon may show daily and seasonal fluctuations, but also long-term variation. Different benthic communities may be present along the annual cycle according to the magnitude of episodic freshwater and sea water inputs. In ...
PHYSICOCHEMICAL PROPERTIES AND ACCEPTANCE OF JELLY AND NECTAR OF ARAZA AND PAPAYA
Chaves, M.A.; Soares, R.D.; Baptista, F.J.; Soares, E.C.; Pinto, E.G.; Sacramento, C.K.The main objective of this work was to evaluate the acceptance of jelly and nectars made from araza (Eugenia stipitata Mc Vaugh) and papaya. The following percentages of araza and papaya were, respectively, used: 50:50; 40:60; 30:70 and 20:80. For both pulps and products the variables studied were: acidity, pH, total content of soluble solids. Acceptance tests were conducted for the developed products. An inver...
Software for the calculation and modeling of effective diffusivity during osmot...
Chaves, M.A.; Baptista, F.J.This paper concerns a comprehensive and graphic computer program for the calculation of effective diffusivities and Fick’s Law model adjustment. The program was designed to be applicable to situations in which solid materials, with a specific geometry (cubes, infinite planes, spheres, infinite cylinders) and a given initial concentration are immersed in a solution with high and constant concentration. Shrinkage...
Grapevine varieties exhibiting differences in stomatal response to water deficit
Costa, Joaquim M.; Ortunõ, Maria F.; Lopes, Carlos M.; Chaves, M.M.Abstract. Knowledge on variety traits and physiological responses to stress is still scarce in Vitis vinifera L., limiting the optimisation of irrigation and breeding for high water use efficiency. We have characterised five grapevine varieties using thermal imaging, leaf gas exchange, leaf morphology and carbon isotope composition. Plants of the varieties Aragonez, Trincadeira, Cabernet Sauvignon, Syrah and To...
Impact of irrigation regime on berry development and flavonoids composition in ...
Zarrouk, Olfa; Francisco, Rita; Pinto-Marijuan, Marta; Brossa, Ricardo; Santos, Raquen Raissa; Pinheiro, Carla; Costa, Joaquim M.; Lopes, Carlos M.In the present study, field grown Aragonez (Syn. Tempranillo) grapevines (Vitis vinifera L.) were subjected to three irrigation regimes (conventional sustained deficit irrigation (DI), regulated deficit irrigation (RDI) and non-irrigated (NI)) during two successive seasons (2007–2008). An integrative study was performed in grape berry skin tissues at four phenological stages of grape berry (pea size, véraison, ...
Comparing water relations and stomatal regulation of Touriga Nacional and Syrah...
Lopes, Carlos; Monteiro, Ana; Chaves, M.M.Proceedings - IX International Terroir Congress, 2012 ; Aiming to compare the physiological responses of the Portuguese red variety Touriga Nacional (TN) with Syrah (SY), we studied during the 2007 growing season five-year-old grapevines growing in a commercial non-irrigated vineyard located at the Lisbon winegrowing region. Predawn (Ypd) and midday (YM) leaf water potential, leaf stomatal conductance (gs) and...
Deficit irrigation in Mediterranean vineyards - a tool to increase water use ef...
Costa, J.M.; Lopes, C.M.; Rodrigues, M.L.; Santos, T.P.; Francisco, R.; Zarrouk, O.; Regalado, A.; Chaves, M.M.IHC - IS Viti&Climate: Effect of Climate Change on Production and Quality of Grapevines and their Products, 28 th, 2012 ; Water is increasingly scarce in Mediterranean Europe and irrigated agriculture is one of the largest and most inefficient users of this natural resource. Ecological topics such as the “water foot print” have become more relevant for the academy, consumers, governments and food industry. The...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||