Bibliografias temáticas / Controlled atmosphere (CA)

Índice

Artigos de revistas
Teses / dissertações
Capítulos de livros

Literatura científica selecionada sobre o tema "Controlled atmosphere (CA)"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 1 de fevereiro de 2022

Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos

Selecione um tipo de fonte:

Consulte a lista de atuais artigos, livros, teses, anais de congressos e outras fontes científicas relevantes para o tema "Controlled atmosphere (CA)".

Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.

Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.

Artigos de revistas sobre o assunto "Controlled atmosphere (CA)"

Izumi, Hidemi, Nathanee P. Ko e Alley E. Watada. "Controlled-atmosphere Storage of Shredded Carrots". HortScience 30, n.º 4 (julho de 1995): 766D—766. http://dx.doi.org/10.21273/hortsci.30.4.766d.

Texto completo da fonte

Resumo:

Quality and physiology of carrot shreds were monitored during storage in air, low O2 (0.5%, 1%, and 2%), or high CO2 (3%, 6%, and 10%) at 0, 5, and 10C to evaluate the response to controlled-atmosphere (CA) storage. Oxygen uptake and CO2 production from respiration were reduced under low-O2 or high-CO2 atmosphere, the reduction being greater at lower O2 and higher CO2 levels. The respiratory quotient was about 1 with samples in air, more than 1 in low-O2, and less than 1 in high-CO2 atmosphere during storage at all temperatures. No differences were found in ethylene production, which were less than 0.2 μl·kg–1·h–1 with all samples. The CA containing 0.5% O2 and 10% CO2 reduced weight loss and formation of white-colored tissue and decreased pH, but did not affect microbial count and texture at all temperatures. Off-odor and black root rot were not detected in both CA and air atmospheres.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Faubion, Dana F., Mary Lu Arpaia, F. Gordon Mitchell e Gene Mayer. "CONTROLLED ATMOSPHERE STORAGE OF `HASS' AVOCADOS". HortScience 27, n.º 6 (junho de 1992): 599c—599. http://dx.doi.org/10.21273/hortsci.27.6.599c.

Texto completo da fonte

Resumo:

Optimum controlled atmosphere (CA) storage conditions were evaluated over a two year period for California-grown `Hass' avocado (Persea americana). Fruit harvests corresponded to early, middle and late season commercial harvests. Various temperatures and CA conditions were tested. The results indicate that the storage life of `Hass' can be extended from 3 to 4 weeks in 5C air, to 9 weeks in 5C CA if they are held in 2% oxygen and 2 to 5% carbon dioxide. Loss of quality as determined by chilling injury expression and flesh softening was greatly reduced in these conditions. Fruit maturity influenced the response to CA storage. Late season fruit had greater loss of quality in storage than earlier fruit. In 2% oxygen and 2.5% carbon dioxide, continuous exposure to ethylene levels as low as 0.1 ppm significantly increased quality loss. Delays in cooling and CA atmosphere establishment of up to three days after harvest did not effect quality.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Blankenship, Sylvia M. "The Effect of Ethylene during Controlled-atmosphere Storage of Bananas". HortScience 31, n.º 4 (agosto de 1996): 638a—638. http://dx.doi.org/10.21273/hortsci.31.4.638a.

Texto completo da fonte

Resumo:

Banana fruit respiration rates and quality parameters such as peel color, pulp pH and soluble solids content were examined at 14°C under a number of controlled atmosphere (CA) environments. CA conditions were 1%, 2%, 4%, or 8% oxygen with or without 5% carbon dioxide. Each treatment combination was also done with or without 50 μL·L–1 ethylene added to the atmospheres. Green banana fruit were either gassed with ethylene (triggered) or ungassed. One percent oxygen was too low to consistently give undamaged bananas. The addition of 5% carbon dioxide to the controlled atmosphere increased fruit respiration rate whereas air plus 5% carbon dioxide showed decreased respiration when compared to air control fruits. Green, triggered fruit partially ripened under the CA conditions. Pulp pH and soluble solids content changed in a normal ripening pattern, however peel color was poor. Addition of ethylene to the atmospheres advanced fruit ripening somewhat in all fruit. When green, ungassed bananas were placed under CA, the presence of ethylene in the atmosphere did not cause the bananas to turn yellow, although some changes in pH and soluble solids were detectable. In triggered fruit the presence of ethylene in the storage advanced ripening with higher oxygen concentrations promoting faster ripening. Bananas that have ripened under CA conditions are not as high quality as those ripened in air in terms of visual appearance.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Levin, Martin D. "Shipboard Controlled Atmosphere Plants: Selection, Installation, and Operation". Marine Technology and SNAME News 32, n.º 02 (1 de abril de 1995): 141–46. http://dx.doi.org/10.5957/mt1.1995.32.2.141.

Texto completo da fonte

Resumo:

The increasing demand for marine transportation of agricultural produce under controlled atmosphere (CA) conditions is leading owners of refrigerated ships to provide permanently installed on-board nitrogen generating plants and atmosphere control systems. The selection of the shipboard CA gas generating plant must take into account the vessel type, the cargoes to be carried, and the range of controlled atmosphere conditions to be achieved for different commodities. The shipboard CA gas generating plant can be situated on the ship's weather deck, installed in the vessel's main or auxiliary machinery spaces, located in a separate CA compartment, or a combination of these options. Ventilation of all spaces containing CA generating equipment and pipelines, combined with atmosphere monitoring and alarms, and safety training of all concerned personnel, provides an acceptable level of safety. Experience with installation and operation of shipboard CA systems demonstrates that, with careful attention to sealing of the cargo spaces, proper equipment selection and installation in accordance with classification society guidelines, a successful shipboard CA installation can be achieved.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Lange, Diana L., e Arthur C. Cameron. "Controlled-atmosphere Storage of Sweet Basil". HortScience 33, n.º 4 (julho de 1998): 741–43. http://dx.doi.org/10.21273/hortsci.33.4.741.

Texto completo da fonte

Resumo:

The effect of controlled atmospheres (CA) on the development of injury symptoms and storage life of sweet basil (Ocimum basilicum L.) cuttings was assessed. Three-node basil stem cuttings were placed in micro-perforated low-density polyethylene packages and stored in the dark at 20 °C in a continuous stream of nitrogen containing the following percentages of O2/CO2:21/0 (air), 21/5, 21/10, 21/15, 21/20, 21/25, 0.5/0, 0.5/5, 1/0, 1.5/0, 2/0, 1/5, 1.5/5, 1.5/7.5, and 1.5/10. Cuttings stored in an atmosphere of <1% O2 developed dark, water-soaked lesions on young tissue after only 3 days. Fifteen percent or more CO2 caused brown spotting on all tissue. Sweet basil stored in 1.5% O2/0% CO2 had an average shelf life of 45 days compared with 18 days for the air control. None of the CA combinations tested alleviated chilling injury symptoms induced by storage at 5 °C.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Mattheis, James, e John K. Fellman. "Impacts of Modified Atmosphere Packaging and Controlled Atmospheres on Aroma, Flavor, and Quality of Horticultural Commodities". HortTechnology 10, n.º 3 (janeiro de 2000): 507–10. http://dx.doi.org/10.21273/horttech.10.3.507.

Texto completo da fonte

Resumo:

The commercial use of modified atmosphere packaging (MAP) technology provides a means to slow the processes of ripening and senescence during storage, transport, and marketing of many fresh fruit and vegetables. The benefits of MAP and controlled atmosphere (CA) technologies for extending postharvest life of many fruit and vegetables have been recognized for many years. Although both technologies have been and continue to be extensively researched, more examples of the impacts of CA on produce quality are available in the literature and many of these reports were used in development of this review. Storage using MAP, similar to the use of CA storage, impacts most aspects of produce quality although the extent to which each quality attribute responds to CA or modified atmosphere (MA) conditions varies among commodities. Impacts of MAP and CA on flavor and aroma are dependent on the composition of the storage atmosphere, avoidance of anaerobic conditions, storage duration, and the use of fresh-cut technologies before storage.

Estilos ABNT, Harvard, Vancouver, APA, etc.

El-Shiekh, Ahmed F., e David H. Picha. "EFFECT OF CONTROLLED ATMOSPHERE STORAGE ON PEACH QUALITY." HortScience 25, n.º 8 (agosto de 1990): 854f—854. http://dx.doi.org/10.21273/hortsci.25.8.854f.

Texto completo da fonte

Resumo:

Peaches stored in air for 40 days at OC developed severe internal breakdown and poor quality after transferring them to 20C to ripen. Comparable fruit stored under controlled atmosphere (1% O2 + 5% CO2) and then ripened at 20C had no breakdown and retained good quality. Fruit stored under CA had less reducing sugars but more sucrose than air stored fruit. Fruit pH increased and titratable acidity decreased over a 40 day storage period. Citric acid increased slightly while malic acid decreased during storage. Little or no differences in overall acidity and individual organic acids existed between CA and air storage. Little or no change in individual phenolic acid content occurred during storage or between CA and air storage. Internal color darkened and became redder with storage. CA stored fruit was significantly firmer than air stored fruit. Sensory evaluation indicated CA stored fruit was more acidic, sweeter, and had better overall flavor than air stored fruit.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Ontai, Stacey L., Robert E. Paull e Mikal E. Saltveit. "Controlled-atmosphere Storage of Sugar Peas". HortScience 27, n.º 1 (janeiro de 1992): 39–41. http://dx.doi.org/10.21273/hortsci.27.1.39.

Texto completo da fonte

Resumo:

Sugar peas (Pisum sativum var. saccharatum cv. Manoa Sugar) were stored for 14 or 21 days under controlled atmospheres (CA) of 21% or 2.4% O2, plus 0%, 2.6%, or 4.7% CO2 at 10 or 1C. Changes in appearance, weight, and in the concentrations of chlorophyll, total soluble sugars, insoluble solids, and soluble protein were evaluated before and after storage. After 14 days of storage at 10C there were minor changes in all indicators of quality under the various storage conditions, but the appearance of sugar peas was better under CA than under 21% O2. When quality was evaluated after 21 days, however, storage under CA at 10C was not as beneficial as storage in 21% O2, at 1C. Holding peas in 2.4% O2, for up to 3 weeks at l0C, a higher than recommended storage temperature, maintained better quality than 21% O2. Increasing the CO, concentration from 0% to 2.6% or 4.7% had no adverse effects on quality and had a beneficial effect in some treatments. Compared with storage in 21% O2, the appearance of the peas was better, the concentrations of chlorophyll and soluble sugar were maintained at higher levels, and the insoluble solids were decreased in all atmospheres with 2.4% O2. Appearance and concentrations of chlorophyll, soluble sugars, and proteins were maintained at 1C regardless of treatments.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Lévesque, P. Guy, Jennifer R. DeEll e Dennis P. Murr. "Sequential Controlled Atmosphere Storage for `McIntosh' Apples". HortScience 41, n.º 5 (agosto de 2006): 1322–24. http://dx.doi.org/10.21273/hortsci.41.5.1322.

Texto completo da fonte

Resumo:

Sequential decreases or increases in the levels of O2 in controlled atmosphere (CA) were investigated as techniques to improve fruit quality of `McIntosh' apples (Malus ×sylvestris [L.] Mill. var. domestica [Borkh.] Mansf.), a cultivar that tends to soften rapidly in storage. Precooled fruit that were harvested at optimum maturity for long-term storage were placed immediately in different programmed CA regimes. In the first year, CA programs consisted of 1) `standard' CA (SCA; 2.5–3.0% O2 + 2.5% CO2 for the first 30 d, 4.5% CO2 thereafter) at 3 °C for 180 d; 2) low CO2 SCA (2.5–3.0% O2 + 2.5% CO2) at 3 °C for 60 d, transferred to low O2 (LO; 1.5% O2 + 1.5% CO2) at 0 or 3 °C for 60 d, and then to ultralow O2 (ULO; 0.7% O2 + 1.0% CO2) at 0 or 3 °C for 60 d; and 3) ULO at 3 °C for 60 d, transferred to LO at 0 or 3 °C for 60 d, and then to SCA or low CO2 SCA at 0 or 3 °C for 60 d. In the second year, the regimes sequentially decreasing in O2 were compared with continuous ULO and SCA. After removal from storage, apples were held in ambient air at 20 °C for a 1-week ripening period. Fruit firmness was evaluated after 1 and 7 d at 20 °C, whereas the incidence of physiological disorders was assessed only after 7 d. Lowering the temperature while decreasing O2 was the best CA program with significant increased firmness retention during storage and after the 1-week ripening period. Reduced incidence of low O2 injury in decreasing O2 programs and absence of core browning at the lower temperature were also observed.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Drake, Stephen R. "Elevated Carbon Dioxide Storage of `Anjou' Pears Using Purge-controlled Atmosphere". HortScience 29, n.º 4 (abril de 1994): 299–301. http://dx.doi.org/10.21273/hortsci.29.4.299.

Texto completo da fonte

Resumo:

`Anjou' pears (Pyrus communis L.) were placed in controlled-atmosphere (CA) storage immediately after harvest (<24 hours) or after a 10-day delay in refrigerated storage, and held there for 9 months at 1C. Oxygen in all atmospheres was 1.5% and CO2 was at either 1% or 3%. Atmospheres in the flow-through system were computer-controlled at ±0.1%. After removal from CA storage, pears were evaluated immediately and after ripening at 21C for 8 days. Pears stored in 3% CO2 were firmer, greener, and displayed less scald, internal breakdown, and stem-end decay than pears stored in 1% CO2. In addition, no internal discoloration of `Anjou' pears was evident when held with 3% CO2. `Anjou' pears held in 3%. CO2 retained the ability to ripen after long-term storage. A 10-day delay in atmosphere establishment had little or no influence on the long-term keeping quality or ripening ability of `Anjou' pears.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Mais fontes

Teses / dissertações sobre o assunto "Controlled atmosphere (CA)"

Basuki, Eko, of Western Sydney Hawkesbury University e Faculty of Science and Technology. "Physiological and biochemical responses of avocado fruit to controlled atmosphere storage". THESIS_FST_XXX_Basuki_E.xml, 1998. http://handle.uws.edu.au:8081/1959.7/335.

Texto completo da fonte

Resumo:

The primary objective of the research was to study the physiological and biochemical changes in Hass avocado fruit stored in different combination of oxygen and carbon dioxide concentrations at both 0 degrees and 5 degrees Centigrade (C), and to determine whether storage in controlled atmosphere (CA) can decrease the incidence of chilling injury (CI). A secondary objective was to identify possible correlations between CA, the incidence of CI, the activity of some ripening related enzymes and changes in proteins during ripening at 20 degrees C following storage at low temperatures. Fruit suffered no CI and ripened normally following CA storage for 3 weeks at both 0 degrees and 5 degrees C, then transferred to air for 6 days at 20 degrees C. CI symptoms did develop after CA storage for 6 and 9 weeks at 0 degrees C. Changes in proteins during ripening were analysed by 2D-PAGE. Some polypeptides were detected in unripe fruit but decreased with ripening. Polypeptides of 16.5, 25, 36 and 56 kD (kilo Dalton) were present early in ripening and their levels further increased during ripening. The appearance of three ripening related polypeptides with estimated molecular weights 80 kD (pI 3.6), 36 kD (pI 5.8) and 16.5 kD (pI 5.7) was observed in fruit at the climacteric stage. Three polypeptides with estimated molecular weights of 41 kD (pI7.8), 36 kD (pI 5.8) and 33 kD (pI 5.1) were found in air stored fruit but were not detected in fruit stored in CA. This research showed that CA did not ameliorate CI at 0 degrees C, instead storage at 0 degrees C caused a premature increase in ethylene production when the fruit were returned to air at 20 degrees C. In contrast, CA storage at 5 degrees C retarded ethylene production and ripening in fruit after it was returned to air at 20 degrees C.
Doctor of Philosophy (PhD)

Estilos ABNT, Harvard, Vancouver, APA, etc.

Pham, Van Tan. "Prediction of Change in Quality of 'Cripps Pink' Apples during Storage". University of Sydney, 2008. http://hdl.handle.net/2123/5133.

Texto completo da fonte

Resumo:

Doctor of Philosophy (PhD)
The goal of this research was to investigate changes in the physiological properties including firmness, stiffness, weight, background colour, ethylene production and respiration of ‘Cripps Pink’ apple stored under different temperature and atmosphere conditions,. This research also seeks to establish mathematical models for the prediction of changes in firmness and stiffness of the apple during normal atmosphere (NA) storage. Experiments were conducted to determine the quality changes in ‘Cripps Pink’ apple under three sets of storage conditions. The first set of storage conditions consisted of NA storage at 0oC, 2.5oC, 5oC, 10oC, 20oC and 30oC. In the second set of conditions the apples were placed in NA cold storage at 0oC for 61 days, followed by NA storage at the aforementioned six temperatures. The third set of conditions consisted of controlled atmosphere (CA) (2 kPa O2 : 1 kPa CO2) at 0oC storage for 102 days followed by NA storage at the six temperatures mentioned previously. The firmness, stiffness, weight loss, skin colour, ethylene and carbon dioxide production of the apples were monitored at specific time intervals during storage. Firmness was measured using a HortPlus Quick Measure Penetrometer (HortPlus Ltd, Hawke Bat, New Zealand); stiffness was measured using a commercial acoustic firmness sensor-AFS (AWETA, Nootdorp, The Netherlands). Experimental data analysis was performed using the GraphPad Prism 4.03, 2005 software package. The Least-Squares method and iterative non-linear regression were used to model and simulate changes in firmness and stiffness in GraphPad Prism 4.03, 2005 and DataFit 8.1, 2005 softwares. The experimental results indicated that the firmness and stiffness of ‘Cripps Pink’ apple stored in NA decreased with increases in temperature and time. Under NA, the softening pattern was tri-phasic for apples stored at 0oC, 2.5oC and 5oC for firmness, and at 0oC and 2.5oC for stiffness. However, there were only two softening phases for apples stored at higher temperatures. NA at 0oC, 2.5oC and 5oC improved skin background colour and extended the storage ability of apples compared to higher temperatures. CA during the first stage of storage better maintained the firmness and stiffness of the apples. However, it reduced subsequent ethylene and carbon dioxide (CO2) production after removal from storage. Steep increases in ethylene and CO2 production coincided with rapid softening in the fruit flesh and yellowing of the skin background colour, under NA conditions. The exponential decay model was the best model for predicting changes in the firmness, stiffness and keeping quality of the apples. The exponential decay model satisfied the biochemical theory of softening in the apple, and had the highest fitness to the experimental data collected over the wide range of temperatures. The softening rate increased exponentially with storage temperature complying with the Arrhenius equation. Therefore a combination of the exponential decay model with the Arrhenius equation was found to best characterise the softening process and to predict changes in the firmness and stiffness of apples stored at different temperatures in NA conditions.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Capítulos de livros sobre o assunto "Controlled atmosphere (CA)"

Thompson, A. K., R. K. Prange, R. D. Bancroft e T. Puttongsiri. "CA technology." In Controlled atmosphere storage of fruit and vegetables, 103–24. Wallingford: CABI, 2018. http://dx.doi.org/10.1079/9781786393739.0103.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Thompson, A. K., R. K. Prange, R. D. Bancroft e T. Puttongsiri. "Dynamic CA storage." In Controlled atmosphere storage of fruit and vegetables, 125–42. Wallingford: CABI, 2018. http://dx.doi.org/10.1079/9781786393739.0125.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Thompson, A. K., R. K. Prange, R. D. Bancroft e T. Puttongsiri. "Recommended CA conditions." In Controlled atmosphere storage of fruit and vegetables, 178–250. Wallingford: CABI, 2018. http://dx.doi.org/10.1079/9781786393739.0178.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Deuchande, Teresa, Susana M. P. Carvalho, Christian Larrigaudière e Marta W. Vasconcelos. "Advances in Refrigerated and Controlled Atmosphere Storage of Fruits and Vegetables". In Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies, 457–89. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8398-3.ch013.

Texto completo da fonte

Resumo:

Long term storage of a variety of crops as well as long-distance transport, has allowed meeting the consumers' expectations in the supply of many types of fresh fruits and vegetables throughout the year. This is only possible with the use of several postharvest technologies. This chapter starts with a brief historical context followed by an overview of the technologies used for fruits and vegetables storage, including refrigerated and controlled atmosphere (CA) storage as well as the most recently developed technologies for storing these produces. We also address the innovation requirements in the refrigeration systems when integrating cold storage with CA, including the need for higher refrigeration capacity, use of air tight storage chambers, CO2 scrubbers and atmosphere generators. The effects of these methodologies on fruit physiology and quality during storage are further discussed. Finally, the current recommendations for long term storage using ‘Rocha' pear as a case study are presented.

Estilos ABNT, Harvard, Vancouver, APA, etc.

HERREGODS, Marcel. "MATHEMATICAL MODELLING ON STORAGE OF FRUITS AND VEGETABLES IN MODIFIED ATMOSPHERE PACKAGING (MAP) AND CONTROLLED ATMOSPHERE STORAGE (CA)". In Control Applications in Post-Harvest and Processing Technology 1995, 17–24. Elsevier, 1995. http://dx.doi.org/10.1016/b978-0-08-042598-6.50005-9.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Brecht, Jeffrey K., Eleni D. Pliakoni e Konstantinos Batziakas. "The impact of temperature on atmosphere requirements and effects: The limits of design and utility for CA/MA/MAP". In Controlled and Modified Atmospheres for Fresh and Fresh-Cut Produce, 147–66. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-804599-2.00009-0.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Gil, Maria Isabel, Maria Luisa Amodio e Giancarlo Colelli. "CA/MA on bioactive compounds". In Controlled and Modified Atmospheres for Fresh and Fresh-Cut Produce, 131–46. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-804599-2.00008-9.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Chen, Xi, Chenyi Xu e Nazir Mir. "Success stories for CA/MA". In Controlled and Modified Atmospheres for Fresh and Fresh-Cut Produce, 277–89. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-804599-2.00014-4.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Saltveit, Mikal E. "Biological basis for CA and MA". In Controlled and Modified Atmospheres for Fresh and Fresh-Cut Produce, 3–22. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-804599-2.00002-8.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Liu, Yong-Biao. "CA requirements for postharvest pest control". In Controlled and Modified Atmospheres for Fresh and Fresh-Cut Produce, 65–74. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-804599-2.00005-3.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Oferecemos descontos em todos os planos premium para autores cujas obras estão incluídas em seleções literárias temáticas. Contate-nos para obter um código promocional único!