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1

Tonetto, Nicola <1994&gt. "The Forbidden Fruit of 'Unnatural Passions': Breaking the Boundaries of the Bildungsroman in Jeanette Winterson’s "Oranges Are Not The Only Fruit"." Master's Degree Thesis, Università Ca' Foscari Venezia, 2022. http://hdl.handle.net/10579/21134.

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In "The History of Sexuality", Michel Foucault claimed that the category of the homosexual emerged towards the end of the nineteenth century and came to define a type of personality through the proliferation of medical, legal and psychological discourses. The crystallisation of queer identities in the twentieth century became progressively visible in literary fiction too, prompting new variations of longstanding literary patterns, such as that of the Bildungsroman. While traditionally following the quest for identity of a male hero from an early age into adulthood through a series of formative experiences, the Bildungsroman genre has been adapted also to articulate the modern urge of “coming out”. This thesis attempts to demonstrate how Jeanette Winterson subverts the conventional framework of the Bildungsroman in her groundbreaking novel "Oranges Are Not The Only Fruit". It first concentrates on the realist aspects of the novel to investigate how the narrative deviates thematically from the classical novels of formations. By focusing on the non-mimetic fragments of Winterson’s novel, this thesis then argues that she disrupts the formal features of the genre through the interweaving of fairy tales, dreams, hallucinations and mythical tales with the realist thread of the story. The final part analyses Winterson's narrative techniques as well as the unconventional modes of representation of the main character’s consciousness in order to observe how "Oranges Are Not The Only Fruit" evokes character identification and invites readers’ empathy. By taking the novel as a model, this thesis argues that contemporary Bildungsromane may enable a better understanding of marginalised subcultures, such as those belonging to the LGBTQ+ spectrum.
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2

Shephard, Keinwen. "Reading feminisms in the 1990's : Jeanette Winterson's Oranges are not the only fruit and Andrea Goldsmith's Facing the music /." Title page and introduction only, 1996. http://web4.library.adelaide.edu.au/theses/09AR/09ars5477.pdf.

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3

Mattsson, Alexandra. ""No Emotion Is the Final One" : Constructing and Performing Gender Identity Through Storytelling in Oranges Are Not the Only Fruit - A Queer Reading." Thesis, Högskolan Dalarna, Engelska, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:du-27378.

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4

Erasmus, Shirley. "Challenging Biblical boundaries: Jeanette Winterson’s postmodern feminist subversion of Biblical discourse in Oranges are not the only fruit (1985) and Boating for beginners (1985)." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/59121.

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This thesis investigates the subversion of Biblical discourse in Jeanette Winterson’s first two novels, Oranges are Not the Only Fruit and Boating for Beginners. By rewriting Biblical stories Winterson challenges traditional Western religious discourses and their rules for heteronormative social and sexual behaviours and desires. Winterson’s texts respond to the patriarchal nature of socially pervasive texts, such as the Bible, by encouraging her readers to regard these texts with suspicion, thus highlighting what can be seen as a ‘postmodern concern’ with the notion of ‘truth’. Chapter One of this thesis comprises a discussion of Biblical boundaries. These boundaries, I argue, are a process of historical oppression which serves to subjugate and control women, a practice inherent in the Bible and modern society. The Biblical boundaries within which women are expected to live, are carefully portrayed in Oranges and then comically and blasphemously mocked in Boating. Chapter One also argues that Winterson’s sexuality plays an important role in the understanding of her texts, despite her desire for her sexuality to remain ‘outside’ her writing. Chapter Two of this thesis, examines the mix of fact and fiction in Oranges, in order to create a new genre: fictional memoir. The chapter introduces the concept of the ‘autobiographical pact’ and the textual agreement which Winterson creates with her readers. In this chapter, I examine Winterson’s powerful subversion of Biblical discourse, through her narration of Jeanette’s ‘coming out’ within a Biblical framework. Chapter Three of this thesis examines Winterson’s second book, Boating, and the serious elements of this comic book. This chapter studies the various postmodern narrative techniques used in Boating in order to subvert Biblical and historical discourse. Chapter Three highlights Winterson’s postmodern concern with the construction of history as ‘truth’. Finally, Chapter Four compares Oranges and Boating, showing the texts as differing, yet equally relevant textual counterparts. This chapter examines the anti-feminine characters in both texts and Winterson’s ability to align her reader with a feminist or lesbian viewpoint. This thesis argues that Winterson’s first two texts deliberately challenge Biblical discourse in favour of a postmodern feminist viewpoint.
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von, Malmborg Siri. "It´s a way of understanding the universe while leaving the universe unexplained : Sökandet efter det autofiktiva jaget i Jeanette Wintersons Oranges Are Not the Only Fruit." Thesis, Södertörns högskola, Institutionen för genus, kultur och historia, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-18547.

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In this essay I examine the auto fictive self in Jeanette Wintersons Oranges Are Not the Only Fruit. I do this through a close reading of the novel using Mieke Bals narratological terms;narrator, story, fabula, time and order.  These narratological terms have been merged together with central themes of the book. I look at the readers understanding of the novel, the relation between fairytale and realism, symbols, intertextuality, the mother-daughter relationship and silences and I analyze these themes in their relation to autofiction and the auto fictive self.   Gemma Lopez Seductions and Narratives has been a key reference, mainly her theories on self-creation in narratives, and the construction of the self, trough language. The narrative is the place where the self can transgress and reshape, which gives the narrative a subversive power. I analyze this presumed power, and look at how the story shapes an opportunity for the subject to see itself. Language is an important factor, and I discuss the contradiction in how we can use the language at the same time as we are formed by it.   This essay has a queer theoretic ground, and elements such as transgression, queer leakages, and binary structures are studied and discussed throughout the essay. Deconstruction is a vital term in the creation of the self through language but the deconstructive viewpoint, in opposition to its aim, sometimes has a tendency to get absolute in its view of the relativity of things. I try to avoid reducing the auto fictive self into one single factor.   I argue on a diverse and multiple approach when understanding the auto fictive self. I see the auto fictive self in Oranges as constituted by a number of factors, such as the encounter of autobiography and fiction, the readers assumptions, a genre or a classification, a free space for the reader and the author, and a way for the subject to see itself and its narrative: a place where the self can reshape and “the alternative story” can be made visible – filled with the words that cannot be spoken.    The multiplicity of factors is an asset rather than a limitation, and what I have found in my search for the auto fictive self in Oranges is this multiplicity.
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6

Cantrell, Samantha E. "Housing sexuality: domestic space and the development of female sexuality in the fiction of Angela Carter and Jeanette Winterson." Texas A&M University, 2003. http://hdl.handle.net/1969.1/2226.

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A repeated theme in the fiction of Angela Carter and Jeanette Winterson is the use of domestic space as a tool for defining socially acceptable versions of female sexuality. Four novels that crystallize this theme are the focus of this dissertation: Winterson??s Oranges Are Not the Only Fruit (1985) and Art and Lies (1994) and Carter??s The Magic Toyshop (1967) and Nights at the Circus (1984). Each chapter examines both authors?? treatments of a specific room in the house. Chapter II, "Parlor Games: Spatial Literacy in Formal Rooms," discusses how rooms used for formal occasions project a desirable public image of a family. More insidiously, however, the rooms protect the sexual order of the household, which often privileges male sexuality. Using the term spatial literacy to describe how characters interpret rooms, the chapter argues that characters with a high spatial literacy can detect not only the overt messages of these formal rooms, but also what underlies those messages. Chapter III, "Making Meals, Breaking Deals: Mothers, Daughters, and Kitchens," discusses the kitchen as the site of the production of domestic comfort. An analysis of who has primary responsibility for the production of comfort and whose comfort is privileged often reveals the power hierarchy of a given household. The chapter also examines the kitchen as a volatile space that can erupt with violence and the expression of repressed emotions and repressed sexuality. Finally, the kitchen is analyzed as a space of intimacy between mothers and daughters. Chapter IV, "Bedtime Stories: Assaulting Sexuality in the Bedroom," argues that the privacy of the adolescent bedroom is often disrupted by the surveillance of family members trying to control the sexual identity of the room??s occupant. The chapter also examines how social prescriptions encourage women to tolerate the interruption of their privacy. Each of the protagonists from these four novels has opportunities to learn about subverting the discursive constructions of domestic space, and several characters enact that subversion. This ability for subversion suggests the possibility for agency, a possibility that postmodernist thought often rejects, but one that Carter and Winterson allow.
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7

Mihajlovska, Lupka. "L'hybridation dans l'oeuvre de Jeannette Winterson." Phd thesis, Université d'Orléans, 2012. http://tel.archives-ouvertes.fr/tel-00835085.

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Nous définissons l'hybridation littéraire comme la combinaison d'éléments a priori disparates aboutissant à la création d'un ensemble à la fois un et multiple, qui garde les traces de ses parties constitutives tout en étant autre, différent, nouveau. L'hybride englobe les sphères de représentation de ses éléments-parents tout en les dépassant. Par conséquent, l'hybridation tend vers l'extension de toutes les frontières, littéraires et culturelles, dans le but de nous offrir une vision du monde et du sujet toujours plus complète. Dans Oranges are not the Only Fruit, Sexing the Cherry, Written on the Body et The PowerBook de Jeanette Winterson, l'hybridation se manifeste à tous les niveaux du texte. L'hybridité physique et sexuelle des narrateurs est ainsi une des manifestations de leurs identités et vies plurielles et paradoxales. Ces hybrides incarnés (monstres, travestis ou androgynes) se construisant au fil de leurs histoires, qui s'inspirent toujours de récits antérieurs, narrateurs et narrations se démultiplient conjointement, s'entremêlent et se redéfinissent sans cesse. Le texte fluctue au gré de l'hybridation générique et de l'intertextualité. De l'entrecroisement de genres réalistes - tels que l'autobiographie, le récit historique ou le discours scientifique - et fictionnels - tels que le conte ou la romance - naît un hybride générique à résonances parodiques représentant la nature du sujet, de sa vie, de la réalité et de la vérité. Enfin, en hybridant des textes préexistants à des motifs personnels, l'auteur élabore une narration originale qui réécrit les schémas sexistes relayés par ses ancêtres et retranscrit sa vision de l'individu, du monde et de l'art.
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8

Hordijk, Jeanine. "Studies to reduce the incidence of chilling injury in navel orange fruit." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80254.

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Thesis (MScAgric)--Stellenbosch University, 2013.
ENGLISH ABSTRACT: Citrus fruit exported from South Africa to markets such as the USA and China undergo a mandatory 24 day exposure of -0.6°C during shipment to kill any insect larvae in the fruit, however, this protocol causes chilling injury (CI). The aim of this study was firstly to determine the influence of various preharvest factors on chilling sensitivity. In addition, Near-Infrared (NIR) spectroscopy was tested as a potential management tool to identify variation in CI susceptibility of fruit and lastly the efficacy of thiabendazole (TBZ) applied in the packline to reduce CI was determined. Various factors influence the susceptibility of a navel orange fruit to CI including cultivar, micro-climate, harvest date, fruit size and rind colour. In this study it was found that ‘Washington’ was more susceptible to CI compared to ‘Navelina’ navel orange. Fruit from the coldest part of Citrusdal (Tharakama) had the highest incidence of CI, which concurred with literature. The incidence of CI was overall less when fruit were harvested in the middle of the commercial harvest window; however, the internal maturity at harvest does not appear to be related to the sensitivity of orange fruit to CI. Near infrared (NIR) spectroscopy was tested as a potential tool to predict fruit quality parameters in relation to CI. Analysing the NIR data with principal components analysis (PCA), score plots were obtained that separate fruit in clusters from the inside and outside of the canopy positions as well as different sizes and rind colours (green vs. orange). However, analysing data with partial least square regression (PLS) using fruit quality parameters (firmness, rind colour and mass), the NIR spectra obtained with the integrated sphere did not provide a good prediction model for CI index. Thiabendazole (TBZ) is reported to reduce the incidence of CI of citrus fruit and this fungicide was applied in a semi-commercial packline in the wax as well as the drench. The results of the application of different fungicides from the TBZ chemical group indicated that the TBZ dip treatments had the highest efficacy in reducing both the incidence and severity of CI and in addition were more effective when applied in warm (40°C) than cold water (10°C). Applications at the commercial recommended rate (20mL.L-1 and half of the commercial recommended rate were both effective in reducing the incidence of CI. Wax application was effective in reducing the incidence of CI however, the application of TBZ in the wax reduced the incidence of CI even more. For the successful reduction of CI incidence in commercial shipments of citrus fruit the focus should not be on a single factor but rather a strategy that encompasses pre-harvest factors that would influence rind quality as well as specific postharvest technologies know to decrease the impact of CI.
AFRIKAANSE OPSOMMING: Sitrus vrugte ondergaan 'n verpligte 24 dae blootstelling aan -0,6°C om moontlike insek-larwes te dood gedurende die uitvoer na markte soos die VSA en China, maar hierdie protokol veroorsaak koueskade. Die doel van hierdie studie was eerstens om die invloed van verskillende voor-oes faktore op koueskade-sensitiwiteit van nawel lemoene te bepaal. Daarbenewens is naby-infrarooi (NIR) spektroskopie as 'n potensiële tegniek getoets om variasie in koueskade-sensitiwiteit van nawel lemoene te identifiseer, en laastens is die effektiwiteit van thiabendazole (TBZ) toediening in die verpakkings lyn, om koueskade te verminder, ondersoek. Verskillende faktore soos kultivar, mikroklimaat, oesdatum, vruggrootte en skilkleur beïnvloed die koueskade-sensitiwiteit van sitrus. Hierdie studie het bevind dat die ‘Washington’ meer sensitief is vir koueskade as die ‘Navelina’ nawels. Vrugte afkomstig uit die koudste deel van Citrusdal (Tharakama) het die hoogste voorkoms van koueskade. In die algemeen was vrugte ge-oes in die middel van die kommersiële-venster die minste koueskade-sensitief, maar interne rypheid hou nie verband met koueskadesensitiwiteit nie. Naby-Infrarooi (NIR) spektroskopie is getoets as 'n potensiële instrument om vrugkwaliteit parameters te voorspel met betrekking tot koueskade. Deur ontleding van die NIR data met behulp van ‘Principal Components Analysis’ kon vrugte groepeer word volgens posisie (binne vs. buite blaredak), groottes en skilkleur. Deur ‘Partial Least Square Regression’ verdere data ontleding en met inagneming van vrugkwaliteit parameters (fermheid, skil kleur en massa), kon die NIR spektra wat verkry was egter nie 'n goeie voorspelling model vir koueskade verskaf nie. TBZ verminder die voorkoms van koueskade van sitrusvrugte na dit toegedien was in 'n semi-kommersiële verpakkingslyn in die waks, ‘drench’ of baddens. Die toediening van verskillende swamdoders van die TBZ chemiese groep in baddens, het aangedui dat die TBZ doop behandeling effektief was om die voorkoms van koueskade te verminder. Daarbenewens was TBZ meer effektief in verlaging van koueskade as dit toegedien word in warm (40°C) as koue (10°C) water, asook teen die volle (20mL.L-1) en die helfte van die aanbevole kommersiële dosis. Wakstoediening was effektief in die vermindering van die voorkoms van koueskade en byvoeging van TBZ in die waks het die effektiwiteit verhoog. Die suksesvolle vermindering van koueskade tydens kommersiële verskeping van sitrusvrugte moet egter nie fokus op 'n enkele faktor nie, maar op 'n strategie wat bestaan uit voor-oes faktore wat die vrugskil kwaliteit beïnvloed, sowel as spesifieke na-oes tegnologieë en hanteringsprotokolle wat bekend is vir die vermindering van koueskade.
Citrus Research International
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Maurer, Michael A., and Kathryn C. Taylor. "Effect of foliar boron sprays on yield and fruit quality of navel oranges." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/222531.

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A field study was designed to determine if foliar boron (B) sprays could increase fruit set and yield of 'Parent Washington' navel oranges (Citrus sinensis). Treatments consisted of two application timings (prebloom and postbloom) and five application rates 0, 250, 500, 750 and 1000 ppm B as Solubor. Leaf B levels had a significant response to both application timing and rate. There were no significant difference in fruit quality or yield.
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Pham, Tam Thi Minh. "Pre-harvest factors affecting fruit quality in sweet oranges with an emphasis on albedo breakdown." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/2300.

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Albedo breakdown known as creasing, a physiological disorder, due to abnormal separation of cells leading to the formation of irregular fractures in the white tissue (albedo) causing the creases of sweet orange rind. It causes serious economic losses to the sweet orange growers in Australia and in other orange producing areas of the world.Fruit quality, particularly albedo breakdown has been influenced by various factors such as plant water relations, genetic factors, plant nutritional status and plant growth regulators. My research investigated the development of the incidence and the severity of albedo breakdown during fruit maturation and ripening, the effects of severity of albedo breakdown on fruit quality among locations and cultivars of ‘Navel’ sweet orange. I also elucidated the influence of deficit regulated irrigation, exogenous application of surfactants added in calcium solution, exogenous application of boron and the role of ethylene in the incidence of albedo breakdown, textural properties of the rind and fruit quality of ‘Navel’ sweet oranges.The incidence and the severity of albedo breakdown increased rapidly after commercial harvest. The incidence and severity of albedo breakdown in ‘Washington Navel’ orange differed from location to location, with the lowest at Harvey as compared to three other locations. Regardless of locations and cultivars, the severity of albedo breakdown did not affect juice content, soluble solids concentration, titratable acidity, ascorbic acid, citric acid and malic acid except for decreasing succinic acid and increasing tartaric acid. Locations and cultivars significantly influenced these fruit quality parameters.The application of deficit irrigation (50% and 75% water supply of control trees) improved fruit quality in terms of increased soluble solids concentrations and acidity levels without affecting percentage of juice, pH of juice, ascorbic acid and individual organic acids in ‘Navelina’ sweet orange. The enhancement of the uptake of Ca in leaf, rind, and pulp of the fruit and the reduction in the incidence of albedo breakdown were obtained with the application of different surfactants added into aqueous solutions of 2% Ca(NO[subscript]3)[subscript]2 starting from 81 days after full bloom (DAFB) at 10-day intervals. Among four tested surfactants, ‘Tween 20’ (0.05%) was the most effective in enhancing Ca uptake, reducing albedo breakdown and improving textural properties of rind and fruit firmness while maintaining the other important fruit quality attributes in ‘Washington Navel’ sweet orange.The foliar application of boron enhanced the concentration of boron and calcium in the leaf, rind and pulp. The single spray application of boron in early summer at 600 mg.L[superscript]-1 was the most effective in increasing boron concentration in the leaf, rind and pulp of fruit, reducing the incidence of albedo breakdown and improving textural properties of rind and fruit firmness without affecting any the other fruit quality attributes in ‘Washington Navel’ sweet orange.Rind of fruit with albedo breakdown produced the higher ethylene production than the normal fruit. The exogenous application of ethylene inhibitors including AVG (200 mg.L[superscript]-1) and CoSO[subscript]4 (300 mg.L[superscript]-1) reduced the incidence of albedo breakdown and improved the rind textural properties in ‘Washington Navel’ sweet orange. Ethylene seems to be involved in the incidence of albedo breakdown.In conclusion, the severity of albedo breakdown did not affect the major attributes of fruit quality in ‘Navel’ sweet oranges. The applications of deficit irrigation, exogenous 2% Ca(NO[subscript]3)[subscript]2 containing ‘Tween 20’ as a surfactant and the exogenous spray application of boron (600 mg.L[superscript]-1) influenced the incidence and severity of albedo breakdown without affecting other fruit quality parameters. Ethylene seems to be associated with the incidence of albedo breakdown in ‘Washington Navel’ sweet orange.
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Matare, Tsaurayi Edwin. "Postharvest losses and changes in physico-chemical properties of fruit (peaches, pears and oranges) at retail and during post-purchase storage." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71974.

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Thesis (MScFoodSc)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: Postharvest fruit loss is a major challenge in addressing food security, sustainable management of resources and profitability of agribusiness. The incidence of postharvest loss and changes in physico-chemical properties of three types of fruit (peaches, pears and oranges) were evaluated at retail and during post-purchase storage. The amount of physical loss at the three retail outlets studied ranged from 3.61% to 18.09% among the fruit types, with the highest incidence occurring in peaches. The estimated annual national physical loss at retail was 418 tons for pears, 1000 tons for oranges, and 7 240 tons for peaches. Based on the WHO recommended 146 kg per capita per year consumption of fruit, the total loss of the three types of fruit was sufficient to meet the dietary fruit requirements of 50 000 people per annum. Similarly, based on the recommended daily allowance of 50 mg of ascorbic acid, these losses could meet the annual vitamin C needs of 82 000 people. The estimated monetary value of the losses at retail ranged from R2.2 million to R96.87 million per annum depending on fruit type and retail outlet. The land wasted to produce lost fruits was 1965 ha while energy wasted was 32.77 x 106 MJ. Greenhouse gas emission of the losses was 2870 tons CO2eq and total water footprint 68 0000 m3. Losses were mainly due to the presence of severe physical damage, rots and physiological disorders. There were significant variations in physico-chemical properties of fruit of the same type from different retail outlet. Although ambient temperature storage improved fruit colour and some chemical constituents responsible for palatability, it was associated with high physical and nutritional (vitamin C) losses. Results from this study show that appropriate harvesting maturity, packaging and maximum care in fruit handling is essential in reducing postharvest losses. Efficient cold chain management and fruit inspection for rots and damages could help to reduce subsequent spoilage at retail and during post-purchase storage. Given that the incidence of postharvest fruit loss observed at retail is the result of cumulative effects along the supply chain, further studies are warranted to map fruit history and magnitude of losses along the value chain.
AFRIKAANSE OPSOMMING: Naoesvrugteverlies is ‟n groot uitdaging in die strewe na voedselsekerheid, volhoubare hulpbronbestuur en winsgewende landbousake. Die voorkoms van naoesverlies sowel as fisiko-chemiese naoesveranderinge by drie vrugtesoorte (perskes, pere en lemoene) is gevolglik by kleinhandelsafsetpunte én gedurende berging ná aankoop beoordeel. Die graad van fisiese verlies by die drie betrokke kleinhandelspunte het gewissel van 3,61% tot 18,09% tussen die vrugtesoorte, met die hoogste verlies by perskes. Die geraamde jaarlikse nasionale fisiese verlies by die kleinhandelspunte was 418 ton pere, 1 000 ton lemoene en 7 240 ton perskes. Op grond van die Wêreldgesondheidsorganisasie se aanbevole jaarlikse vrugte-inname van 146 kg per persoon, was die totale verlies van die drie vrugtesoorte genoeg om aan die vrugtedieetvereistes van 50 000 mense per jaar te voldoen. Op grond van die aanbevole daaglikse inname van 50 mg askorbiensuur, kan hierdie verlies eweneens in die jaarlikse vitamien C-behoeftes van 82 000 mense voorsien. Die geraamde geldwaarde van die verlies by die kleinhandelspunte strek van R2,2 miljoen tot R96,87 miljoen per jaar, na gelang van die vrugtesoort en bepaalde kleinhandelspunt. Die vermorste grond om die verlore vrugte te produseer, was 1 965 ha, terwyl energievermorsing op 32,77 x 106 MJ te staan gekom het. Kweekhuisgasvrystellings met betrekking tot die verlies was 2 870 ton CO2e, en die totale watervoetspoor 68 0000 m3. Vrugteverlies kon hoofsaaklik aan ernstige fisiese skade, verrotting en fisiologiese afwykings toegeskryf word. Daar was beduidende variasies in die fisiko-chemiese eienskappe van dieselfde vrugtesoort by verskillende kleinhandelaars. Hoewel berging by omgewingstemperatuur vrugtekleur en bepaalde chemiese komponente vir smaaklikheid verbeter, word dit ook met groot fisiese en voedingstof- (vitamien C-) verliese verbind. Die resultate van hierdie studie toon dat toepaslike oesrypheid, die regte verpakking en maksimum sorg in vrugtehantering noodsaaklik is om naoesverlies te verminder. Doeltreffende koelkettingbestuur en vrugte-inspeksie vir verrotting en skade kan latere bederf by kleinhandelsafsetpunte sowel as gedurende berging ná aankoop help beperk. Aangesien die naoesvrugteverlies wat by die kleinhandelspunte waargeneem is uit kumulatiewe faktore in die verskaffingsketting spruit, is verdere studies nodig om vrugtegeskiedenis na te spoor en die omvang van die verlies in die algehele waardeketting te bepaal.
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Maurer, Michael, and James Truman. "Effect of Foliar Boron Sprays on Yield and Fruit Quality of Navel Oranges in 1998 and 1999." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/223840.

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A field study was designed to determine if foliar boron (B) sprays could increase fruit set and yield of 'Parent Washington' navel oranges (Citrus sinensis). Treatments consisted of two application timings (prebloom and postbloom) and five application rates 0, 250, 500, 750 and 1000 ppm B as Solubor. Leaf B levels had a significant response to both application timing and rate in 1998, but there were no significant differences in 1999. There were no significant difference in fruit quality or yield in either year.
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Morales, Alfaro Julia. "Effect of Rootstock on the Fruit Quality of Mandarins "Clemenules" and "Tango", and Blood Oranges "Tarocco Rosso" and "Moro"." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/165858.

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[ES] La citricultura se enfrenta a escenarios ambientales cambiantes que provocan diferentes estreses bióticos y abióticos que pueden dificultar la producción o afectar a la calidad de la fruta. El patrón sobre el cual se injerta una variedad específica es una importante herramienta para mejorar su adaptabilidad a cada área de cultivo. En la presente Tesis se realiza el estudio del efecto del patrón sobre la calidad físico-química y nutricional de la fruta en variedades de gran interés comercial en la actualidad, mandarinas 'Clemenules' y 'Tango' y naranjas sanguinas 'Tarocco Rosso' y 'Moro'. En 'Clemenules' se llevó a cabo la evaluación de la calidad de la fruta de árboles injertados sobre ocho patrones en tres momentos de cosecha durante dos campañas. Los patrones Forner-Alcaide 13 y C-35 destacaron por adelantar el cambio de color, lo que es de gran interés comercial. Por otra parte, Forner-Alcaide V17 destacó por mantener niveles óptimos de acidez hasta el final de la campaña y presentar el mayor contenido en vitamina C, flavonoides, glucosa y fructosa. Carrizo Citrange también indujo altas concentraciones de sacarosa y vitamina C. 'Tango' es una mandarina de reciente introducción en el área mediterránea de gran interés por su periodo de recolección tardío. En esta Tesis se abordó el estudio de los cambios en la calidad fisicoquímica, nutricional y sensorial de la mandarina 'Tango' injertada sobre dos patrones (Carrizo Citrange y Forner-Alcaide 5) en las dos áreas principales de producción de Andalucía. Los resultados revelaron que la calidad de la fruta se vio influenciada por la localización de las parcelas, lo que se relacionó con la composición de la textura del suelo. En ambas localizaciones, Forner-Alcaide 5 indujo mayor contenido en acidez, sólidos solubles totales, sacarosa, vitamina C y ácido cítrico en la fruta. Las determinaciones físico-químicas, junto con la evaluación sensorial permitieron establecer el momento óptimo de recolección dependiendo de las diferentes condiciones estudiadas. También se ha incluido un estudio del comportamiento postcosecha de esta variedad, ya que no existían datos en nuestras condiciones de cultivo. La mandarina 'Tango' presentó síntomas externos de daños por frío a partir de los 20 días almacenada a 1°C y 5°C. Se realizó un estudio micro-estructural para caracterizar la alteración. Los frutos del patrón Forner-Alcaide 5 presentaron una menor incidencia de los daños por frío. El almacenamiento a 9°C no comprometió la calidad externa o interna. Dentro del grupo de naranjas, en los últimos años existe una creciente demanda por las naranjas sanguinas para su consumo en fresco. Para evaluar el efecto del patrón se tomaron las variedades 'Moro' y 'Tarocco Rosso' injertadas sobre ocho patrones. La calidad interna se vio afectada por el momento de cosecha, siendo más evidente en 'Moro'. En ambas variedades el patrón afectó a los parámetros de calidad durante la maduración. En 'Moro', se observó una reducción en el color del zumo debido a la degradación de los antocianos, siendo los patrones C-35, Macrophylla y Volkameriana los que mostraron un mayor descenso. Esta degradación se relacionó con los cambio de la temperatura durante el periodo de recolección. En 'Tarocco Rosso' no se evidenció ninguna degradación, lo que sugiere que esta variedad es menos sensible a los cambios de temperatura. En esta variedad Forner-Alcaide 5 y Forner-Alcaide 13 produjeron fruta con mayor contenido en antocianos y azúcares. Además se llevó a cabo el estudio de la aptitud a la frigoconservación de las variedades de sanguinas 'Tarocco Rosso' y 'Sanguinelli'. Mientras que la calidad interna no se vio afectada por el almacenamiento (1°C, 5°C y 9°C) durante 45 días, la fruta presentó síntomas de daños por frío a 1°C. 'Sanguinelli' presentó mayor incidencia que 'Tarocco Rosso'. Estas sanguinas se pueden almacenar entre 5 y 9°C
[CA] La citricultura s'enfronta constantment a escenaris ambientals canviants que provoquen diferents estressos biòtics i abiòtics. El patró sobre el qual s'empelta una varietat específica és una important eina per a millorar la seua adaptabilitat agronòmica en cada àrea de cultiu. En la present Tesi s'ha dut a terme l'estudi de l'efecte del patró sobre la qualitat físic-química i nutricional de la fruita en varietats de gran interés comercial, mandarines 'Clemenules' i 'Tango' i, taronges sanguines 'Tarocco Rosso' i 'Moro'. En 'Clemenules' es va dur a terme l'avaluació de la qualitat de la fruita d'arbres empeltats sobre huit patrons en tres moments de collita, en dues campanyes. Entre els patrons avaluats, Forner-Alcaide 13 i C-35 van destacar per avançar el canvi de color. D'altra banda Forner-Alcaide V17 va destacar per mantindre nivells òptims d'acidesa fins al final de la campanya i va presentar el major contingut en vitamina C, flavonoides, glucosa i fructosa. Carrizo Citrange també va induir altes concentracions de sacarosa i vitamina C en la fruita. 'Tango' és una mandarina de recent introducció en l'àrea mediterrània amb gran interés pel seu període de recol·lecció que comença quan finalitza el de les clementines. En la present Tesi es van estudiar els canvis en la qualitat físic-química, nutricional i sensorial de la mandarina Tango empeltada sobre dos patrons (Carrizo Citrange i Forner-Alcaide 5) durant el període de collita en les dues àrees principals de producció d'Andalusia. La qualitat de la fruita es va veure influenciada per la localització, la qual cosa es va relacionar amb la composició de la textura del sòl. En totes dues localitzacions, Forner-Alcaide 5 va ser el patró que va induir major contingut en acidesa, sòlids solubles totals, sacarosa, vitamina C i àcid cítric en la fruita. Les determinacions físic-químiques i l'avaluació sensorial van permetre establir el moment òptim de recol·lecció depenent de les diferents condicions estudiades. També s'ha inclòs un estudi del comportament postcollita d'aquesta varietat, ja que no existien dades en les nostres condicions de cultiu. La mandarina 'Tango' va presentar símptomes externs de danys per fred a partir dels 20 dies emmagatzemada a 1°C i 5°C. Es va realitzar un estudi micro-estructural per a caracteritzar l'alteració provocada per les baixes temperatures. Els fruits del patró Forner-Alcaide 5 van presentar una menor incidència dels danys per fred. L'emmagatzematge a 9°C no va comprometre la qualitat externa o interna d'aquesta varietat. Dins del grup de taronges, en els últims anys existeix una creixent demanda per les taronges sanguines pel seu consum en fresc. Per a avaluar l'efecte del patró sobre sanguines es van prendre dues varietats, 'Moro' i 'Tarocco Rosso' empeltades sobre huit patrons. La qualitat interna es va veure influenciada pel moment de collita, la qual cosa va ser més evident en la varietat 'Moro'. En totes dues varietats el patró va afectar els canvis en els paràmetres de qualitat estudiats. En 'Moro', es va observar una reducció en el color del suc degut a la degradació del antocians. Aquesta degradació es va relacionar amb el canvi de la temperatura experimentada durant el període de recol·lecció. 'Tarocco Rosso' és menys sensible als canvis de temperatura. En aquesta varietat els patrons Forner-Alcaide 5 i Forner-Alcaide 13 van produir la fruita amb major contingut en antocianos i sucres. A mes s'aporta l'estudi de l'aptitud a la frigoconservació en les sanguines 'Tarocco Rosso' i 'Sanguinelli'. Mentre que la qualitat interna no es va veure afectada per l'emmagatzematge a cap de les temperatures assajades (1°C, 5°C i 9°C) durant 45 dies, la fruita va presentar símptomes de danys per fred a 1°C. `Sanguinelli' va presentar major incidència que 'Tarocco Rosso'. La fruita es pot emmagatzemar entre 5°C i 9°C durant 30 dies en el cas de 'Sanguinelli' i fins a 45 en e
[EN] Citriculture faces changing environmental scenarios that cause biotic and abiotic stress. The rootstock onto which a specific variety is grafted is an important tool to help to improve its agronomic adaptability to each crop area. The present Thesis was carried out to study the effect of rootstock on physico-chemical and nutritional fruit quality in some varieties of commercial interest today: 'Clemenules' and 'Tango' mandarins, and 'Tarocco Rosso' and 'Moro' blood oranges. In 'Clemenules', the fruit of the trees grafted into eight rootstocks at three harvest times was evaluated by performing studies during two seasons. Forner-Alcaide 13 and C-35 Citrange stood out for their earlier color change, which is very interesting for this variety, in which early harvesting is a relevant aspect from the commercial point of view. Forner-Alcaide V17 stood out for maintaining optimum acidity levels until the season ended and presented the highest contents in vitamin C, flavonoids, glucose and fructose. Carrizo Citrange brought about high concentrations of sucrose and vitamin C in fruit. 'Tango' is a mandarin variety that has been recently introduced into the Mediterranean Region. Its harvest time is very interesting because it starts when that of clementines ends. The present Thesis studies changes in the physico-chemical, nutritional and sensorial quality of 'Tango' fruit grafted onto two rootstocks (Carrizo Citrange and Forner-Alcaide 5) during the harvest period in the two main production areas in Andalusia. The results revealed that fruit quality during harvest was influenced by the location, which was particularly related to soil texture composition. In both areas, Forner-Alcaide 5 was the rootstock that induced higher acidity content, and more total soluble solids, sucrose, vitamin C and citric acid in fruit. The physico-chemical determinations, along with the sensorial evaluation, allowed the optimum harvest time to be established depending on the different studied conditions. This Thesis also includes a study about this variety's postharvest behavior as no data are available for our crop conditions. The 'Tango' mandarin presented outer chilling injury symptoms after being stored for 20 days at 1°C and 5°C. A microstructural study was done to characterize the alteration caused by low temperatures. The Forner-Alcaide 5 rootstock fruit showed a lower chilling injury incidence. Storage at 9°C did not compromise quality fruit. Among oranges, demand for blood oranges to be eaten fresh has grown in recent years, basically due to their high content in anthocyanins and their positive effect for human health. To assess the effect that rootstock had on blood oranges, two varieties were taken, 'Moro' and 'Tarocco Rosso', grafted onto eight rootstocks. Internal quality was strongly influenced by harvest time, which was more evident for 'Moro'. In both varieties, rootstock affected changes in the quality parameter studied. In 'Moro', juice color faded as anthocyanins degraded, and rootstocks C-35 Citrange, Macrophylla and Volkameriana showed the most marked reduction. Such anthocyanin degradation was related to the change in temperature that took place during the harvest period. In 'Tarocco Rosso', anthocyanins did not undergo degradation, which suggests that this variety is less sensitive to changes in temperature. In this variety, rootstocks Forner-Alcaide 5 and Forner-Alcaide 13 gave fruit with a higher content of anthocyanins and sugars. This Thesis also includes a study of the suitability of cold storage of two blood orange varieties: 'Tarocco Rosso' and 'Sanguinelli'. Although storage at any tested temperature (1°C, 5°C and 9°C) did not affect internal quality for 45 days, fruit displayed chilling injury symptoms at 1°C, with a higher incidence for 'Sanguinelli' than for 'Tarocco Rosso'. Fruit can be stored between 5°C and 9°C for 30 days for 'Sanguinelli' and for up to 45 days with 'Tarocco Rosso'.
This study has been supported by Instituto Valenciano de Investigaciones Agrarias and co-financed by FEDER and European Social Fund. The authors thank Anecoop S. Coop. and Frutaria Agricultura, S.L for supplying the fruit herein used and its technical support.
Morales Alfaro, J. (2021). Effect of Rootstock on the Fruit Quality of Mandarins "Clemenules" and "Tango", and Blood Oranges "Tarocco Rosso" and "Moro" [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/165858
TESIS
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14

Lihandra, Eka M. "Assessment of ethanol, honey, milk and essential oils as potential postharvest treatments of New Zealand grown fruit a thesis submitted in (partial) fulfilment for the degree of Master of Applied Science at the Auckland University of Technology, New Zealand, 2007 /." Click here to access this resource online, 2007. http://repositoryaut.lconz.ac.nz/theses/1361/.

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Mihajlovska, Lupka. "L'hybridation dans l'oeuvre de Jeannette Winterson." Electronic Thesis or Diss., Orléans, 2012. http://www.theses.fr/2012ORLE1124.

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Nous définissons l’hybridation littéraire comme la combinaison d’éléments a priori disparates aboutissant à la création d’un ensemble à la fois un et multiple, qui garde les traces de ses parties constitutives tout en étant autre, différent, nouveau. L’hybride englobe les sphères de représentation de ses éléments-parents tout en les dépassant. Par conséquent, l’hybridation tend vers l’extension de toutes les frontières, littéraires et culturelles, dans le but de nous offrir une vision du monde et du sujet toujours plus complète. Dans Oranges are not the Only Fruit, Sexing the Cherry, Written on the Body et The PowerBook de Jeanette Winterson, l’hybridation se manifeste à tous les niveaux du texte. L’hybridité physique et sexuelle des narrateurs est ainsi une des manifestations de leurs identités et vies plurielles et paradoxales. Ces hybrides incarnés (monstres, travestis ou androgynes) se construisant au fil de leurs histoires, qui s’inspirent toujours de récits antérieurs, narrateurs et narrations se démultiplient conjointement, s’entremêlent et se redéfinissent sans cesse. Le texte fluctue au gré de l’hybridation générique et de l’intertextualité. De l’entrecroisement de genres réalistes – tels que l’autobiographie, le récit historique ou le discours scientifique – et fictionnels – tels que le conte ou la romance – naît un hybride générique à résonances parodiques représentant la nature du sujet, de sa vie, de la réalité et de la vérité. Enfin, en hybridant des textes préexistants à des motifs personnels, l’auteur élabore une narration originale qui réécrit les schémas sexistes relayés par ses ancêtres et retranscrit sa vision de l’individu, du monde et de l’art
We understand literary hybridization as the combination of seemingly different elements resulting in the creation of an entity that is simultaneously single and multiple. Indeed, while it is utterly other and new, the hybrid still shows the marks of its constituents. The hybrid incorporates its ‘parents’’ initial fields of representation while reaching beyond them. Consequently, hybridization is a process that pushes all boundaries, be they literary or cultural, to offer an ever more complete vision of the subject and his/her life. In Jeanette Winterson’s Oranges are not the Only Fruit, Sexing the Cherry, Written on the Body and The PowerBook, hybridization permeates every level of the text. Thus, the narrators’ physical and sexual hybridity is a manifestation of their plural and paradoxical identities. These hybrid creatures (monsters, transvestites or androgynous beings) build their identities through the stories they tell and that are always inspired by existing narratives. Therefore, the narrators and their narratives proliferate conjointly, intermix and redefine each other constantly. The shape of the text fluctuates with generic hybridization and intertextuality. Realistic narratives – such as autobiographical, historical or scientific discourses – and fictional ones – such as fairy tales or romances – interact to produce generic hybrids with parodic undertones that represent the nature of the subject, his/her life, reality and truth. Finally, by hybridizing existing texts and personal literary devices, the author elaborates original narratives that rewrite her ancestors’ sexist discourses and reflect how she perceives the individual, the world and art
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Zhang, Xiang-ning, and 張湘寧. "Female Romance and Constraints in Du Xiu¬¬-Lan’s Ni Nü (逆女) and Jeanette Winterson’s Oranges Are Not the Only Fruit." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/98098359719437553147.

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碩士
亞洲大學
外國語文學系碩士班
100
Both in Western and Chinese societies, it is empowering to foster the friendships of emotional and personal connections amongst women. We define these interactions as female romantic friendship. Female romance means emotional support and expression of love towards other women. It can, furthermore, sustain women in difficult time and provide the support to struggle continually against oppressions and inequalities. These friendships between women can provide models of female romantic friendships and even expand the definition and function of lesbianism. In this thesis, I will discuss the female romance on the basis of two lesbian novels, Oranges Are Not the Only Fruit and Ni Nü. Oranges Are Not the Only Fruit is a bildungsroman which depicts the relationship between a pious mother and her adopted lesbian daughter. Ni Nü, published in 1996, illustrates a lesbian daughter who rebels against the familial tie and filial piety. It portrays the protagonist’s, Tian-shi Ding (丁天使), lesbian identity since childhood and how the familial conflicts especially the mother-daughter relationship affects her sexual identity. Both novels express the idea of “genuinely spiritual dimension” that mainly indicates lesbians’ sharing of feelings, experiences and thoughts emotionally and spiritually rather than physically.
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Câmara, Karin Gonçalves. "Intertextualidade (e anti-linenaridade) as obras de Janette Winterson : Oranges are not the only fruit, The passion e Sexing the chery : desafio, ou afirmação de convençõpes literárias?" Master's thesis, 2006. http://hdl.handle.net/10400.2/447.

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Dissertação de Mestrado em Estudos Ingleses apresentada à Universidade Aberta
Uma introdução que dá a conhecer o background literário de Jeanette Winterson introduz os tópicos e as teorias que subjazem à argumentação desenvolvida ao longo da dissertação. A anti-linearidade, a intertextualidade, o Pós-Modernismo ou a construção da identidade constituem vectores centrais na abordagem às obras da autora. A crítica literária parece responder em uníssono à questão que pretende categorizar a obra literária da autora. O Pós-Modernismo é uma estética recorrentemente associada a Winterson, nomeadamente pela exploração de questões que instauram a incerteza quanto a verdades universais, desconstruindo a ideia pré-concebida de ordem, jogando com expectativas, contextos, formas, associações e estruturas (supostamente) estáveis – narrativa; estilo; facto/ficção; história/literatura; tempo e espaço, ou género. Partindo de um pressuposto de que um texto não é constituído por uma unidade hermética e linear, mas que comunica com outros textos (no seu sentido mais lato) tal parece constituir a base de criação textual de Winterson, impondo, assim, toda uma dinâmica de análise dialógica/intertextual. Neste sentido, procurarei demonstrar como é que a intertextualidade e uma narrativa anti-linear lhe permitem desafiar convenções literárias, sublinhando a forma como legitimam a produção de sentidos e a definição de uma ou de várias identidades. Tentarei igualmente evidenciar de que modo a autora se apropria das tradições literárias masculinas para centralizar discursos marginais e promover a sua arte
Résumé- Une introduction qui nous donne à connaître le background littéraire de Jeanette Winterson introduit les sujets et les théories qui sous-tendent à l’argumentation développée tout au long de la dissertation. L’anti-linéarité, l’intertextualité, le Post-modernisme ou la construction de l’identité constituent les vecteurs principaux de l’étude des oeuvres de cet auteur. La critique littéraire semble répondre à unisson à la question qui prétend catégoriser l’oeuvre littéraire de cet auteur. Le post-modernisme est une esthétique habituellement associée à Winterson, nommément au travers de l’exploration des questions qui instaurent l’incertitude quant aux vérités universelles, détruisant l’idée reçue de l’ordre, jouant avec les attentes, contextes, formes, associations et structures (soi-disant) stables – narration; style; fait/fiction; histoire/littérature; temps et espace, ou genre. Partant du principe qu’un texte n’est pas construit à partir d’une unité hermétique et linéaire, mais qui communique avec d’autres textes (au sens large), tel semble constituer la base de la création textuelle de Winterson, imposant, ainsi, toute une dynamique d’analyse dialogique/intertextuelle. Je me propose donc de démontrer dans quelle mesure l’intertextualité et une narrative anti-linéaire lui permette de défier les conventions littéraires, soulignant la manière dont on légitime la production de sens et la définition de une ou plusieurs identités. Je tenterai également de mettre en évidence de quelle manière l’auteur s’approprie des traditions littéraires masculines afin de centraliser des discours marginaux et de promouvoir son art.
Abstract- An introduction establishing Jeanette Winterson’s literary background opens the debate of the main topics, as well as of the theories underlying the approaches developed along the chapters’ approaches; among them there are anti-linearity, intertextuality, postmodernism or the construction of an identity. Literary criticism seems to agree on the way of categorising the author’s work; postmodernism is commonly associated to Winterson’s writing, especially when issues establishing the uncertainty concerning universal truths are under analysis, deconstructing the traditional idea of order and playing with expectations, contexts, shapes, associations and structures supposedly stable – plot; style; fact/fiction; history/literature; time and space; or gender. Starting with the assumed idea that a text is not a linear and hermetic object, but that it communicates with other texts instead in the broadest sense, it seems to be the foreground of Winterson’s artistic creation, thus establishing a new dialogic/intertextual analysis dynamic. From this perspective I will try to demonstrate how intertextuality and an anti-linear narrative serve her purpose of challenging literary conventions, highlighting the way they allow the production of meanings and the definition of one or several identities. I will also undertake the task of showing how she appropriates what is regarded as masculine literary traditions in order to centralize marginal discourses and promote her art
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18

Freeman, Tanith. "Effect of soil amendments, climate and rootstock on tree performance and fruit quality of 'Valencia' orange used for processing." Diss., 2002. http://hdl.handle.net/2263/29343.

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Please read the abstract in the section 00front of this document
Dissertation (MSc (Agric) Horticultural Science)--University of Pretoria, 2005.
Plant Production and Soil Science
unrestricted
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19

Wielenga, Corianne. "The dialogue between Christianity and postmodernism in selected postmodern novels." Thesis, 2004. http://hdl.handle.net/10413/2594.

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This paper seeks to explore the dialogue between postmodern thought and Christian theology. The dialogue will be grounded in four postmodern novels: Toni Morrison's Beloved, Ian McEwan's Atonement, Jill Paton Walsh's Knowledge of Angels, and Jeanette Winterson's Oranges Are Not the Only Fruit. In many Church circles, it has often been said that postmodernism, as it manifests itself in popular culture, is a threat to the Christian faith. However, I will be arguing that the opposite is the case, and that postmodernism has allowed for new ways of thinking about the self that has great resonance with certain theological conceptions of the self. It will be argued that the postmodern subject is one that seeks to make sense of 'the other' without risking the exploitation of the other, and that this lies very close to the theological concept of relationship, based on the idea of covenant. The self as responsible to an other and as a participant in community will be explored, from both the postmodern and theological perspectives. Before exploring issues of the self, this thesis will contextualize the dialogue by exploring postmodern conceptions of space and time. It will examine how ideas around space and time have been imagined throughout human history, thereby contextualizing the emergence of postmodern thinking. It will then show how this emergence of a postmodern space and time in fact creates new possibilities for the Christian faith to reexpress itself in ways that are more relevant to the 21st century. The concluding chapter of this thesis brings to light the longing within our postmodern reality for a place we can call home, a place where we can belong, and find healing. Such a place, such a homecoming, is offered to us in the spaces opened up to us by the dialogue between the Christian faith and postmodernity, and is found within a community of people who are learning that, as, postmodern philosopher Emmanuel Levinas states, "there is something more important than my life, and that is the life of the other" (in Beavers, 1996,16).
Thesis (M.A.)-University of KwaZulu-Natal, Pietermaritzburg, 2004.
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20

Magwaza, Lembe Samukelo. "A preliminary study on the effect of climatic conditions and fruit mineral concentration on the development of lenticel damage in 'Tommy Atkins' and 'Keitt' mangos (Mangifera indica L.) and rind pitting in 'Benny Valencia' oranges (Citrus sinensis)." Thesis, 2008. http://hdl.handle.net/10413/5012.

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The South African fresh fruit industry is a significant exporter, accounting for approximately 45% of the country’s agricultural exports. Of the total exported fruit in the 2005/06 season, 60% was subtropical fruit. However, certain physiological rind disorders such as mango lenticel damage and citrus rind pitting are frequently observed, reducing the commercial value of the fruit. This thesis deals with the epidemiology of these rind physiological disorders, in an attempt to obtain basic information that could serve as a guideline to predict and manage the fruit susceptibility to these disorders. The study further investigated the relative effects that certain pre-harvest factors have on the postharvest development of these disorders. Factors of particular interest were harvest maturity, climate and the mineral content of the fruit. Rind pitting is a physiological disorder of citrus that develops during storage. A study was conducted to investigate the relative effects that certain pre-harvest factors have on the post-harvest development of superficial rind pitting in ‘Benny Valencia’ oranges. Factors of particular interest were harvest maturity, climate and the mineral content of the fruit. In addition, trees were treated with two different formulations of nitrogen viz. limestone ammonium nitrate (LAN) and a slow release nitrogen fertilizer (Horticote®), during March 2006. The fruit were then sampled on a two-weekly basis over a period of three months. On each sampling date a set of quality related readings, such as juice sugar and titratable acid concentration were taken, after which the mineral concentration of the exocarp and mesocarp was measured. Fruit were also stored under export simulation conditions. The results indicate that fruit from trees that received additional N were more susceptible to rind pitting than those from control trees. Of the two N applications, fruit from trees that received slow release N were more susceptible to rind pitting than fruit from trees that received the LAN treatment. Another important observation made was that the nitrogen concentration of oranges from trees that received extra nitrogen fertilizer was lower than that from the controls. In addition, experimental fruit were smaller than control fruit. Fruit from trees that received the slow release nitrogen treatment were smallest. A sink/source hypothesis aimed at explaining this phenomenon has been formulated and is currently being investigated. A number of control mechanisms are also being explored. Mango lenticel damage is a serious defect that occurs on the rind of the fruit. This condition causes fruit to attain a speckled appearance and become unattractive to the buyer. Each season, the disorder reduces the packout of fresh fruit by about 16%. Several preharvest factors play a critical role in the postharvest development of lenticel damage. Preliminary studies have shown that the incidence of lenticel damage has some relationship to fruit moisture and fruit nutrient concentration, depending on which of these factors first achieve a critical threshold. A study was conducted to develop appropriate skin moisture content parameters to predict lenticel damage potential before harvest. The study further aimed to provide certain biological markers regarding appropriate nitrogen fertilization practices to reduce lenticel damage. To do this, two trials were conducted approximately a month before harvest. Firstly, a plastic ground cover to restrict water supply was laid under ‘Tommy Atkins’ trees at Numbi Estates in the Hazyview area of the Mpumalanga province, South Africa. Secondly, additional nitrogen was applied as three different formulations, viz. limestone ammonium nitrate (LAN), potassium nitrate (KNO3), and a slow release nitrogen fertilizer under trade name Horticote®, to two ‘Tommy Atkins’ and two ‘Keitt’ orchards at Bavaria Estates in the Hoedspruit area of the Limpopo province, South Africa. Fruit samples were harvested, packed and stored at different intervals after rain during January 2006. With regard to lenticel damage on ’Tommy Atkins’ fruit from Numbi, there was no significant difference between the control and plastic cover treatments. However, when compared to fruit from other localities, the Numbi fruit had the highest incidence of lenticel damage, followed by the conventional orchard at Bavaria. The Numbi fruit, which had the highest incidence of lenticel damage, also had the highest pulp and skin nitrogen concentration. Of the four treatments at Bavaria, the LAN treatment had the highest incidence of lenticel damage, but the pulp and skin nitrogen concentrations of this treatment were comparable with the other treatments. The organic fruit had significantly lower lenticel damage incidence and also had the lowest pulp and rind nitrogen concentrations. Similarly, ‘Keitt’ results showed that the intensity of lenticel damage was significantly higher in the orchard that received additional nitrogen in the form of LAN. From the results it was, however, not possible to formulate nitrogen-lenticel damage correlations. The study failed to prove the case for a direct relationship between the disorder and with nitrogen, as there were no significant or consistent correlations with nitrogen content. An interesting relationship was nevertheless observed between lenticel damage and the time of harvest before and after rainfall. The results indicated that both ‘Tommy Atkins’ and ‘Keitt’ fruit become more susceptible to lenticel damage when harvested a day after rainfall and this gradually reduces afterwards. The effect of rainfall in this regard and a sink-source hypothesis arising from these observations are also discussed.
Thesis (M.Sc.)-University of KwaZulu-Natal, Pietermaritzburg, 2008.
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