1,725,173 research outputs found
Anhidro-aldóz tozilhidrazonok kapcsolási reakcióinak vizsgálata aril-triflátokkal és aril-jodidokkal
No full textDiplomamunkámban az anhidro-aldóz tozilhidrazonok aril-triflátokkal és aril-jodidokkal végzett kapcsolási reakcióit mutatom be. A kutatásom célja a a biológiai szempontból fontos, de nehezen hozzáférhető szubsztituált exo-glikálok új szintézismódszerének felderítése. A várt terméket rossz hozammal sikerült izolálni, a reakciók főterméke az exo-glikál volt.Vegyészmérnök MScMSc/M
Physiological and biochemical changes in imported litchi fruit
Full text linkIt is important to determine the appropriate conditions for maintaining postharvest quality of litchi fruit after arrival from overseas markets. The present study, therefore, aimed to detail the effects of different storage conditions on physiological and biochemical changes in aril and pericarp tissues of imported litchi fruit.
Results from Chapter 4 were the first to fully detail the alterations of individual sugars, organic acids and total phenols in aril and individual anthocyanins in pericarp tissue as well as physiological changes under different storage temperatures in three cropping seasons. Results clearly demonstrated that higher concentrations of sucrose, malic, tartaric and total phenolic contents were maintained at 5°C in aril and higher anthocyanins and total phenolic concentrations in pericarp during 13 days as compared with 8, 10, 13 and 20°C storage. Fruit treated at 5°C also had lower weight loss, brighter red pericarp colour and higher total soluble solids as compared against those fruit stored in other temperatures. A temperature of 5°C was therefore proposed for litchi distribution and storage, and acted as the basis of this study.
Relative humidity (RH) and vapour pressure deficit (VPD) in a storage environment are also important parameters affecting postharvest life. A new system using different glycerol solutions was employed to achieve defined RH levels in the present study. Although effects of RH on postharvest changes in litchi fruit have been described in previous works, the recent study is the first report detailing the effects of different and controlled VPD on litchi postharvest alterations. Low VPD was required to maintain quality of imported litchi during 9 days storage. In addition to reducing both weight loss and respiration rate, storage at 95-100 %RH and 5°C (VPD = 0.000-0.084 kPa) successfully remained high levels of sucrose and malic acid content in aril, and tartaric acid, cyanidin 3-rutinoside and mannose in pericarp tissue. It was therefore recommended that storage conditions for litchi should not only focus on maintenance of the cool chain, but should also consider controlling a VPD of ≤0.068 kPa to attain improved conservation of visual appearance.
Appropriate use of packaging materials can prolong shelf-life of assorted fruit and vegetables including litchi fruit. Imported litchi fruit were wrapped with either micro-perforated polypropylene (PP), PropaFreshTM PFAM (PF), NatureFlexTM NVS, CellophaneTM WS or kept unwrapped prior to storage at 13°C for 9 days. Predictably, packed fruit retained better quality during storage as compared with unwrapped fruit. Each film tested resulted in an altered gas composition in the packages and thus affected postharvest quality. PF significantly decreased hydrolysis of sucrose in aril and retained higher cyanidin 3-rutinoside levels in pericarp. PF film also limited fruit weight loss and maintained sugar and organic acids concentration in both aril and pericarp.
Exogenous application of certain chemicals after harvest has been commercially used to control browning in litchi for many years. However, off-flavours may results and could potentially impact on consumer safety. These possible effects have enhanced demand for non-adulterated fruit on the market. Postharvest changes in pericarp and aril of non-adulterated and commercially-treated fruit as influenced by packaging films under different temperatures were detailed. Although commercially-treated fruit had higher aril organic acids and pericarp anthocyanins, sucrose hydrolysis in aril tissue was accelerated. The use of PF film at 5°C maintained higher sucrose and malic contents in aril tissue of non-adulterated and commercial litchi during 11 days as compared with unwrapped or PP regimes or 13°C storage. Results suggested that PF could replace PP as a new active film for the litchi industry and be a substitute for chemical treatment to maintain quality of litchi fruit
Decomposição de 1-aril-2,2,2-tribromoetanóis em meio básico
Full text linkDissertação (mestrado) - Universidade Federal de Santa Catarina, Curso de Pós-Graduação em Físico-Químic
Maximum parsimony reconstruction of aril types
No full textMaximum parsimony reconstruction of aril types, implemented in Mesquit
Proximate characterization and lycopene determination in bitter melon seed aril
Full text linkBitter melon aril is the mucilage covering the fruit\u27s seeds which could contain beneficial dietary ingredients. The bright red color of bitter melon aril suggests that it could contain lycopene. The purpose of this study was to determine the proximate composition of bitter melon aril and to explore this material as a potential rich source of lycopene that has health benefits. Bitter melon aril from Sri Lanka, harvested in Arkansas, USA in 2005, 2006, and 2007 was analyzed. An investigation to develop an extraction method for lycopene from bitter melon was performed using liquid-liquid and a polar liquid extraction. The compositional analysis included determination of moisture, ash, lipid, protein, starch, soluble dietary fiber, insoluble dietary fiber, and mineral content. The proximate characterization of bitter melon aril revealed that it is high in starch with concentrations ranging from 31.4 to 40.3 g/100g. Bitter melon aril had an average of 9.3% soluble fiber, insoluble fiber and protein content individually with no significant difference between harvest seasons. The lipid content was determined to be between 1.7 - 3.1 g/100g of BMAF and had significance differences among harvest seasons. The ripe fruit\u27s aril has major mineral content in potassium, phosphorous, magnesium, calcium and sulfur. The lycopene content was linearly correlated to spectrophotometric absorbance at 476nm. Bitter Melon aril contains 142-170μg/g of lycopenes and other similar compounds with no significant difference
Diferenciacion de razas de fusarium oxysporum f. sp. dianthi por electroforesis de aril esterasa
No full textEn los últimos años, la separaci6n por la técnica de electroforesis de las enzimas que presentan polimorfismo, ha sido utilizada para establecer diferencias entre poblaciones de microorganismos, cuando las características morfológicas no son distintivas. En este trabajo, se propuso la separación por electroforesis de la enzima aril esterasa obtenida a partir de aislamientos de Fusarium oxysporum f. sp. dianthi de la raza 2 obtenidos de suelos y plantas de la Sabana de Bogotá, un aislamiento de la misma forma especial y raza procedente de Italia, aislamientos de las razas 1, 4 y 8 de Fusarium oxysporum f. sp. dianthi, un aislamiento de Fusarium oxysporum f. sp. Lycopersici, aislamientos de Fusarium oxysporum no patogénicos y un aislamiento de Phialophora cinerescens. Los resultados muestran que mediante la separación electroforética de aril esterasa es posible determinar diferencias entre poblaciones del genera Fusarium. Palabras claves: Enzimas, Electroforesis. Polimorfismo, Fusarium, Aril esterasa
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Investigation of Aril Characteristics of Some Autochthonous Pomegranate (Punica granatum L) Varieties in Macedonia
Full text linkThe individual aril characteristics of eight autochthonous pomegranate varieties (Lifanka, Bejnarija, Karamustafa, Ropkavac, Valandovska, LC, Zumnarija and Hicaz) from R. Macedonia were investigated using computer vision software methods. The great differences in the dimension of aril at the varieties were determined. The variety Lifanka is characterized with the greatest length (12.6 mm), width (9.5 mm) and mass (0.5 g) of the aril. Cross section aril area (61.1 mm2) and perimeter (31.6 mm) indicate that the variety ‘Hicaz’ is characterized with the smallest aril. Investigation of the aril shape showed different level of asymmetry depending on the variety. Generally, the variety Hicaz is characterized with the most asymmetrical aril. Based on CIELab system of coloration, great differences in the aril colour were noted among the investigated pomegranate varieties. The variety Hicaz had the darkest coloration (L* 19.3; a* 13.1; b* 5.3). High correlation dependence between coloration and shape and mass was determined
Investigation of aril characteristics of some autochthonous pomegranate (Punica granatum L) varieties in Macedonia
Full text linkThe individual aril characteristics of eight autochthonous pomegranate varieties (Lifanka, Bejnarija, Karamustafa, Ropkavac, Valandovska, LC, Zumnarija and Hicaz) from R. Macedonia were investigated using computer vision software methods. The great differences in the dimension of aril at the varieties were determined. The variety Lifanka is characterized with the greatest length (12.6 mm), width (9.5 mm) and mass (0.5 g) of the aril. Cross section aril area (61.1 mm 2) and perimeter (31.6 mm) indicate that the variety 'Hicaz' is characterized with the smallest aril. Investigation of the aril shape showed different level of asymmetry depending on the variety. Generally, the variety Hicaz is characterized with the most asymmetrical aril. Based on CIELab system of coloration, great differences in the aril colour were noted among the investigated pomegranate varieties. The variety Hicaz had the darkest coloration (L* 19.3; a* 13.1; b* 5.3). High correlation dependence between coloration and shape and mass was determined
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