Susana C. Fonseca

Modelling respiration rate of fresh fruits and vegetables for modified atmosphere packages: a review

Respiration rate and gas exchange through the package material are the processes involved in creating a modified atmosphere inside a package that will extend shelf life of fresh fruits and vegetables. Thus, modelling respiration rate of the selected produce is crucial to the design of a successful modified atmosphere packaging (MAP) system. In this paper, general aspects of the respiration process are presented. The major methods for measuring respiration rates, along with their advantages and limitations are discussed. Factors affecting the respiration rate and respiratory quotient are outlined, stressing the importance of temperature, O2 and CO2 concentrations, and storage time. Respiration rate models in the literature are also reviewed. 2002 Elsevier Science Ltd. All rights reserved.

Modelling O2 and CO2 exchange for development of perforation- mediated modified atmosphere packaging

Perforation-mediated modified atmosphere packaging relies on the use of macro perforations or tubes to control the O2 and CO2 exchange and create the desired atmosphere inside an otherwise gas-tight package. In this work, the O2 and CO2 exchange through a single tube was studied. DiAerent temperatures (5‐20∞C) and tube dimensions (length from 9 to 17 mm and diameter from 6 to 30 mm) were tested. O2 and CO2 mass transfer coeAcients were determined according to a lumped mass transfer capacitance model that yielded a good description of the gas transfer. Temperature in the range tested did not show a significant eAect on the mass transfer coeAcients. A multiplicative non-linear equation was found to yield a good prediction of the dependence of the O2 mass transfer coeAcient on tube diameter and length. The ratio between the CO2 and O2 mass transfer coeAcients, an important parameter in the design of MAP, was 0.81 and none of the factors tested influenced its value. ” 2000 Elsevier Science Ltd. All rights reserved.

Maintaining optimal atmosphere conditions for fruits and vegetables throughout the postharvest handling chain

Optimal controlled and modified atmospheres (CA and MA) for fresh produce vary according to the specie, its maturity or ripeness stage, the temperature, and the duration of exposure. However, individual lots of produce are typically handled for different times and at different temperatures during storage, transportation, and retail display. In this paper, we review some of our previous work showing the potential for using different atmospheres for mangoes (Mangifera indica L.) and strawberries (Fragaria � /ananassa Duchesne) depending on the anticipated storage length and temperature. Since it would be desirable, especially for produce transported over extended distances, as in marine transport, to maintain optimal atmosphere conditions throughout the postharvest handling chain, we also describe our procedure for designing a combination CA/MAP system that involves first designing the MAP for a particular commodity that will produce an optimal atmosphere for retail display conditions, then selecting a CA that will interact with the MAP to produce the optimal atmosphere within the packages during transportation at a lower temperature. An example of the design procedure is given from our work with fresh-cut kale (Brassica oleracea var. acephala DC.). Another example of this proposed MAP/CA system deals with its application to mixed load transportation of strawberries and snap beans (Phaseolus vulgaris L.). # 2002 Elsevier Science B.V. All rights reserved.

Modelling respiration rate of shredded Galega kale for development of modified atmosphere packaging

Abstract The design of modified atmosphere packaging (MAP) for fresh-cut produce requires an adequate model for prediction of respiration rate as a function of both temperature and gas composition. In this work, the O2 consumption and CO2 production rates of shredded Galega kale were studied. The storage temperatures used were 1, 5, 10, 15 and 20 °C. The atmospheres tested were all combinations of 1, 5 and 10% v/v O2 plus 0, 10 and 20% v/v CO2 with the balance being N2, as well as ambient air. Temperature was the variable with the greatest influence on respiration rate and the effect of gas composition increased with temperature. The dependence of respiration rate on gas composition was well described by a Michaelis–Menten type equation with uncompetitive CO2 inhibition. The respiratory quotient (RQ) was found to be constant for the range of temperatures and gas compositions tested and was equal to 0.93±0.01. The constants of the Michaelis–Menten equation increased exponentially with temperature. The change over time of respiration rate of leaves exposed to air at 20 °C was also analysed. It was observed that respiration rate decreased with time and that the ratio between the respiration rate of shredded and intact leaves was approximately constant in the period tested and equal to 2.8.

Development of perforation-mediated modified atmosphere packaging to preserve fresh fruit and vegetable quality after harvest

The use of perforations as a means of obtaining large size containers suitable for modified atmosphere packaging (MAP) would greatly enhance the applicability of this technology for storage and distribution of fresh and minimally processed products. General concepts of MAP, and advantages and drawbacks of using perforations to achieve it are discussed. Products for which perforated packages can be used are listed. The variables that affect this type of package are presented and the methodology for designing an adequate package is described and illustrated with the case study of shredded cabbage.

Modelling the influence of time and temperature on the respiration rate of fresh oyster mushrooms

The respiration rate of mushrooms is an important indicator of postharvest senescence. Storage temperature plays a major role in their rate of respiration and, therefore, in their postharvest life. In this context, reliable predictions of respiration rates are critical for the development of modified atmosphere packaging that ultimately will maximise the quality of the product to be presented to consumers. This work was undertaken to study the influence of storage time and temperature on the respiration rate of oyster mushrooms. For that purpose, oyster mushrooms were stored at constant temperatures of 2, 6, 10, 14 and 18 ℃ under ambient atmosphere. Respiration rate data were measured with 8-h intervals up to 240 h. A decrease of respiration rate was found after cutting of the carpophores. Therefore, time effect on respiration rate was modelled using a first-order decay model. The results also show the positive influence of temperature on mushroom respiration rate. The model explaining the effect of time on oyster mushroom’s respiration rate included the temperature dependence according to the Arrhenius equation, and the inclusion of a parameter describing the decrease of the respiration rate, from the initial time until equilibrium. These yielded an overall model that fitted well to the experimental data. Moreover, results show that the overall model is useful to predict respiration rate of oyster mushrooms at different temperatures and times, using the initial respiration rate of mushrooms. Furthermore, predictive modelling can be relevant for the choice of an appropriate packaging system for fresh oyster mushrooms.

MARKET ORIENTATION, ORGANIZATIONAL LEARNING, INNOVATION AND PERFORMANCE: KEYS TO THE SUSTAINABILITY OF NON-PROFITS

The National Academic Depository of India is a crystallized vision. The depository was conceptualized to digitalize academic awards offered by educational institutions at one place. The depository can eliminate the need to store awards in physical form. It can verify the awards issued by different organizations to different individuals. The secure digital depository is a good remedy to fake and forged certificates. The concept of academic depository is very similar to the concept of financial securities. The concept of depository was tried out with the help of academic awards of one examination body in India. The pilot was completed successfully. In order to become fully functional, the depository has to overcome a few challenges with respect to academic diversities in terms of duration of courses and equivalence. The Legislation on academic depository is being drafted to take care of these challenges. Besides that, the NAD is begetting with many other new kinds of uses and possibilities. The NAD may open up new roles for the educational institutions as well such as to prepare reports for teachers from examination data on teaching learning gaps rather than just labeling students. Academic Depository is a pioneering effort of its kind in the world.The Annual Report is a good mean of describing the situation of a company to all the stakeholders although it is difficult to compare Annual Reports coming from different entities. A process of harmonization of European accounting standards was started in order to bring Annual Reports into line and it is currently being carried out through the adoption of IFRS standards. Once Annual Reports have been created adopting a common accounting standard, the very next step is to code them using the same IT language. If a common computer language is selected, Annual Reports or other documents can easily be compared without recoding and retyping them. The starting point of this process is the definition of an appropriate taxonomy to be used by both those drafting and reading the documents. The process of adopting an appropriate set of accounting standards, selecting the related taxonomy and, finally, drawing up documents using a new business language, called eXtensible Business Reporting Language (XBRL) leads companies to produce sound, meaningful and clear documents that greatly improve sharing of useful information. Moreover, the adoption of IFRS standards and XBRL encoded statements provides a set of measures for building sound and widely accepted models. The aim of the present paper is to analyze the changes to income statement presentation and the new concept of financial performance that emerges as a result of the adoption of IFRS and XBRL language. The drawing up of the Income Statement by XBRL may improve the financial performance measurement and disclosure with many benefits for all the stakeholders.The low quality of primary and secondary education in most Latin America countries is a well-known problem. As a response to this reality, the private educational market has been steadily growing in those countries. These private schools, in general, offer a higher quality and personalized education for the students that can afford it. The main selling point of these institutions is access to better resources: better teachers, technologies, materials and pedagogical methods. This difference in education quality creates a problem once students from public schools reach university. This IGUAL project will generate learning solutions (combination of e-learning software, pedagogical methodologies and learning materials) to facilitate the assimilation of new knowledge and the development of new skills even when the student has deficient background knowledge and/or underdeveloped required skills. The solutions that this project will provide have the potential to be used by all students in the Latin AmericanThe relationship between teacher and student is of extreme importance, especially as the latter is going through a delicate period in his life require planned to meet the requirements of the positive relationship in education and influence the psyche and personality and then impact in the community beyond. The most important characteristic of human from other organisms other being a social being by nature it affects and is affected at the same time by culture, traditions and customs of the society, and in this context says sociologist (role Chaim): * it when he speaks of human society is the one who speaks.The author in her article focuses on the issue of long-term unemployment and poverty, which often results in interdisciplinary problems. It is a problem of the whole society, which needs to be constantly looked into and it also constantly needs the elimination of the outside world´s effects on it. The aim of this work is to highlight the seriousness of this problem, the need for its elimination, with emphasis on the confrontation between scientific disciplines and their connections.

Monitoring the quality of sliced pork ham packed in different modified atmospheres during 45 days of storage

This study, financed by EXTRASLICED45 project, promoted by Primor Charcutaria-Prima S.A. and focused on extra-sliced pork ham, aims to use different modified atmosphere packaging (MAP) as a preservation technique for extending the lifetime of the product. In this study, physical, chemical, microbiological and organoleptic properties of sliced pork ham, packaged in MA, were monitored during 45 days of storage at 5 oC. Pork ham samples were packed in four different gas mixtures of 10, 30, 40 and 60% of CO2 (N2 for balancing), in thermoformed trays of APET/EVOH/PE film sealed with PE/PVDC. During the storage time the monitoring of the evolution of the gas mixture composition, pH, water activity (aw), moisture content, colour parameters and firmness of samples was performed. Searching for pathogenic (Salmonella spp., Enterobacteriaceae, Escherichia coli, Listeria monocytogenes and coagulase-positive staphylococci), total viable counts at 30 oC and lactic acid bacteria (LAB) was performed. For sensory evaluation, a trained panel of 6 elements, conducted a quantitative descriptive analysis (QDA®). The previously defined attributes were: brightness, colour, aroma, overall appearance, flavour, texture (hardness and cohesiveness) and salty taste, using a 6-point scale. The panel was also asked about their perception related to the overall appearance and offflavours defects. The results of instrumental analysis of texture and colour, and the chemical parameters showed no significant differences over the time of storage and between MAP. The results of analysed microbiological parameters were satisfactory (according to HPA) and no pathogenic were detected. The principal components analysis highlighted the existence of correlations between the studied parameters. The panel detected some differences between the short and long-term stored ham samples but those differences were no considered defects.