Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 148 for “"Tween"”.
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Subteen, preteen, tween: Preadolescent literature inside and out
… surveys and research on the history of the tween retail market to uncover the subtle messages being communicated to tween consumers. I consider the liminal position of novels for preadolescent readers within the larger book-producing world by studying the publishing, marketing, and store …
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Growing Up Tween: Femininity, Masculinity, And Coming Of Age
… are sparse: children, and more specifically, tweens. I conducted semi-structured interviews with 20 tweens (10 female and 10 male) between the ages of 8 and 12 and 15 mothers of tweens. Results indicated that tweens adhered to dominant prescriptions of gender and sexuality. Tween masculinity …
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Bratz, BFFs, princesses and popstars: femininity and celebrity in tween popular culture
… a dramatic increase in media output aimed at “tweens” (preadolescent girls), and the expansion more broadly of tween popular culture. This exclusively female preadolescent consumer demographic is seen to emerge alongside a heightened visibility of girls within popular culture since the …
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Effects of the Non-ionic Surfactant Tween 80 on the Enzymatic Hydrolysis of Model Cellulose and Lignocellulosic Substrates
… the effects of the non-ionic surfactant Tween 80 on the enzymatic hydrolysis of cellulose and LC substrates. Model cellulose substrates were prepared from cellulose nanocrystals (CNCs) obtained by sulfuric acid hydrolysis of wood pulp. Two methods were developed for the removal of the …
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Being a teen, tween and in-between girl in Mitchell's Plain: toward a heterogenous conception of youth agency in a Global South city
How do young South Africans assert agency? This study uses Emirbayer and Mische's (1998) theoretical conception of agency as temporally embedded and constantly reconfiguring; and combines it with the idea of shifting strategies as manifestations of agency. I introduce the seminal works in South …
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The competitive adsorption of surfactants in model dairy emulsions : a thesis presented in partial fulfillment of the requirements for the degree of Master of Food Technology at Massey University, Palmerston North, New Zealand
… in turn effect what interactions might occur between droplets, the surfactants and other components in the product. Often there are multiple potential surfactants in the system and the ability to predict which will adsorb onto newly created oil droplet surface area is valuable. The objective of …
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Solubilization of volatile organic compounds in edible nonionic surfactants
… (reduction in the interfacial tension between the NAPLs and groundwater). The solubilization efficiency of VOCs in an edible surfactant system is very important for the implementation of SESR. The micelle-water partition coefficient (Km) is one of the key parameters to describe the …
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Development of microemulsion delivery systems for bioactive compounds : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Food Technology at Massey University, Auckland, New Zealand
… 708G, and also with different surfactants (Tween 20, 40, 60 and 80). It was found that peanut oil and fractionated coconut oil could not be utilised to form microemulsions by this method, whereas IPM and lemon oil had the ability to fabricate microemulsions. When 1% Tween 80 was introduced …
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Mechanistic approaches towards understanding particle formation in biopharmaceutical formations. The role of sufactant type and level on protein conformational stability, as assessed by calorimetry, and on protein size stability as assessed by dynamic light scattering, micro flow imaging and HIAC
… and aging of samples in the presence of Tween 20, Tween 80, Brij 35 and Pluronic F-68 surfactants led to an increase in the populations of larger particles for BSA samples, whereas IgG2 systems did not notably aggregate under storage conditions MFI was shown to be more sensitive than HIAC …
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Adsorption of Xyloglucan onto Cellulose and Cellulase onto Self-assembled Monolayers
… The effect of the non-ionic surfactant Tween 80 on the adsorption of cellulase onto alkane thiol self-assembled monolayers (SAMs) on gold was also studied. Methyl (-CH3), hydroxyl (-OH) and carboxyl (-COOH) terminated SAMs were prepared. Adsorption of cellulase onto untreated and Tween …
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Application of pharmaceutical technologies to improve the activity of cancer chemotherapeutic agents
… the drug itself and one of the excipients (i.e. Tween 80) are extensive. I designed a solid lipid nanoparticle (DCX-SLNs) formulation to improve the delivery of docetaxel into solid tumors and to avoid excipient-related side effects associated with the current Tween 80-based docetaxel …
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The amino acid and monosaccharide content of the cell walls of Thiobacillus thiooxidans
… 8085. The surface active agents Tergitol 08 and Tween 80 were investigated for their ability to reduce the lag period found in the growth of T. thiooxidans. Although a concentration of 12.5 ppm Tween 80 did decrease the lag period, the use of these surfactants was not effective in increasing the …
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Microemulsions containing centella asiatica extract as antioxidant and anti-acetylcholinesterase agent
… ratios of LGEO or VCO, and non-ionic surfactant, Tween 20 (T20) or Tween 80 (T80). The formulated MEs were characterized for the identification of functional groups by fourier transform infrared (FTIR), thermal behaviour by differential scanning colorimetry (DSC), and morphology and particle size …
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Nanostructured materials for hydrophobic drug delivery
… provided that a suitable surfactant (either Tween-20 or Tween-80) mediates the molecule solvation and its subsequent release into aqueous media. Moreover, NC gels protect BC from degradation much better than its storage in freezer or in organic solvent, making these carriers interesting for …
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Impact of Amphiphiles in Cellulase Stabilization, Recycling and Ethanol Production from Pretreated Biomass
… source for fermentation to ethanol. Between the two routes developed for hydrolysis of biomass to carbohydrate monomers, acid and enzymatic hydrolysis, the latter is favored. However, a foremost concern for economically efficient ethanol production from biomass through enzymatic …
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Characteristics of phosphatidate phosphatase from developing seeds and microspore-derived cultures of oilseed rape
… PAP from MD embryos of B. napus L. cv Topas. Tween 20 solubilized PAP effectively with concomitant maintenance of enzyme in the soluble fraction. A number of detergents were screened for their ability to solubilize microsomal PAP from MD embryos of B. napus L. cv Topas. Tween 20 solubilized …
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Optimisation of the preservation of microbial cell banks for enhanced fermentation process performance
… of various cryopreservants including glycerol, Tween 80 and dimethyl sulphoxide on final fermentation performance measured by biomass and α-amylase concentration was investigated using optical density, dry cell weight, colony forming units, and multi-parameter flow cytometry. The application of …
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Some effects of dimethyl sulfoxide on absorption, translocation, and membrane permeability in plants
… DMSO, 30%, was not as effective as 0.25% Tween 80 (non-ionic surfactant containing polyoxyethylene sorbitan monooleate) in enhancing the absorption and translocation of dicamba, a phloem-mobile herbicide. Tween 80 was more effective than DMSO in enhancing the foliar uptake of atrazine and …
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The use of the fungus Ascochyta caulina as a biological control agent for the weed Chenopodium album. Evaluation of the bioherbicide formulation efficacy of Ascochyta caulina on different life stages of the weed plant Chenopodium album under laboratory and field conditions comparing Libyan and UK populations.
… regions. Two formulations of mycoherbicides (Tween 80 and Gelatine based applications) were tested in the laboratory, and showed promise in reducing growth of the weed, especially the formula of Tween 80. There was extensive shoot fresh and dry weight reduction of inoculated Chenopodium album, …
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Among Night Owls, Smombies and Fidgety Philips: Connections between sleep problems, media use and ADHD symptoms in children. A questionnaire survey
… research gap with regard to the interrelations between sleep problems, media use and ADHD symptoms. In order to investigate this for children be-tween the ages of five and 10 years, a questionnaire survey will be conducted as part of this study. For this purpose, parent-report versions of the …
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