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Food insecurity remains a major challenge affecting the rural poor households in South Africa. The consumption of green leafy vegetables is important to address micronutrients deficiency in rural communities and, at the same time, it contributes to fibre intake. This study investigated the people’s attitude towards the cultivation and utilisation of ILVs in rural communities. A cross-section survey study was conducted among 1 000 respondents in randomly selected households in communities. The majority of respondents were not willingly consuming ILVs. This is because most consumers were black and of the low-income group. ILVs that are consumed grow mainly in the wild. The regular consumption of these vegetables as indicated in this study is interesting, as this will help in mitigating micronutrient deficiency. Furthermore, these vegetables could be incorporated in formulated food to improve iron and zinc, especially in infant foods formulation. Based on the findings of this study it would be important to find ways of encouraging cultivation of ILVs for both nutrition and as income generating activities. / Life and Consumer Science / M.CS.

M. Tech. Agriculture / Leafy vegetables, Swiss chard (Beta vulgaris L. var. cicla), lettuce (Lactuca sativa L.) and mustard spinach (Brassica juncea), are widely grown in South Africa. These leafy vegetables are popular owing to their availability and nutritional properties. Optimisation of crop nutrition is essential to maximize yield and quality of vegetables. Therefore, a study was conducted to evaluate the effect of different levels of nitrogen application on growth and quality parameters of leafy vegetables when grown in a non-circulating hydroponic system. The objective of this study is two-fold: primarily, to determine the influence of nitrogen on growth, yield and overall quality of Swiss chard, lettuce and mustard spinach grown in a non-circulating hydroponic system, and secondly, to determine the effect of nitrogen applications on bioactive compounds and antioxidants, such as antioxidant scavenging activities, ascorbic acid, total phenolics and flavonoids.

Throughout history, wild green vegetables have played a significant role in human diets around the world, coevolving alongside agriculture and changing land use patterns (Wilson, 1990). Wild greens such as purslane (Portulaca oleracea), lambquarters (Chenopodium spp.) and amaranth (Amaranthus spp.), wild ancestors of crop plants, are prehistoric foods that are cultural and nutritional mainstays in many parts of the world including the Arizona-Mexico borderland region. While consumption of these foods is commonplace on the Mexican side of the border, on the American side their use is less frequent. In this study, I explore the patterns of and barriers to consumption of wild green vegetables by Latinos living in the Arizona (AZ)-Mexico (MX) borderland city of Tucson, AZ. I use Weber's rationalization theory, as well as human agency theory, to guide my exploration of how the dominant food system contributes to dietary acculturation and the loss of agency among Latinos living in Tucson. In-depth interviews and naturalistic observations are employed across a diverse array of market settings, which include a farmers' market, several carniceri­as (Mexican butcher shops), a corner store/tortilleria with procurers and purveyors of Latino and indigenous foods, and a more conventional supermarket. The findings reveal a reduction in knowledge and consumption of heritage greens by Latinos concurrent to their adoption of more mainstream American foods. I consider this pattern and its various implications in the context of the rationalization of the dominant U.S. food system, which leads to a dynamic that favors efficiency and productivity over authenticity and aesthetics.

Warm-season turf species are becoming increasingly popular for putting green use in the transition zone. Ultradwarf bermudagrass (Cynodon dactylon (L.)  C. transvaalensis Burtt-Davy) is the prevalent warm-season putting green species, but seashore paspalum (Paspalum vaginatum Swartz) and ‘Diamond’ zoysiagrass [Zoysia matrella (L.) Merr.] may also be grown in the transition zone. Warm-season species are susceptible to winter injury and may require different management regimes than cool-season species. Therefore, the objectives of this research were to assess the impacts of various management practices on warm-season putting green species and characterize the physiological basis for differences in freeze tolerance of various warm-season putting green species. Field studies determined sampling procedures form thatch-mat depth and soil organic matter content of warm-season putting greens and assessed the impact of various management practices on different warm-season putting green species/varieties. The relative freeze tolerance of ‘Champion’ and ‘TifEagle’ ultradwarf bermudagrass cultivars, ‘SeaDwarf’ seashore paspalum, and Diamond zoysiagrass were determined, along with the accumulation of proline and polyamines during cold acclimation, in growth chamber studies. All species/varieties required different sampling numbers for determination of thatch-mat depth and soil organic matter. More sand was incorporated into the turf canopy and surface hardness was increased with brushing and vibratory rolling TifEagle putting greens after sand topdressing application than either treatment alone. Putting green management programs with lower mowing heights and increased mowing frequencies increased ball roll distance on a MiniVerde putting green without negatively affecting turf quality. Weekly vertical mowing + daily grooming on TifEagle reduced thatch depth and turfgrass quality, while increasing topdressing incorporation over either treatment alone. Diamond was the most freeze tolerant species/variety, followed by TifEagle, Champion, then SeaDwarf. Cold acclimation increased proline concentration for all species/varieties except SeaDwarf, but had inconsistent effects on polyamines. Spermidine and putrescine concentrations differed with species/variety, but were not correlated to freeze tolerance.

Übernimmt eine Protestpartei Regierungsverantwortung, sieht sie ihre Prinzipien und Forderungen der realpolitischen Nagelprobe ausgesetzt. Es ist ein Dilemma von Anspruch und Wirklichkeit, ein Spagat zwischen Protestimage und Regierungspolitik / der diese Parteien oftmals zu zerreißen droht. Anhand der Fallstudien von vier mitregierenden Protestparteien in Deutschland sollen folgende Fragen beantwortet werden: Was macht eine Partei zur Protestpartei? Was waren die Ursachen für die Wahlerfolge der Grünen, der AL, der STATT-Partei und der Schill-Partei? Wie verliefen die Koalitionsverhandlungen? Welche Forderungen konnten die Protestparteien gegenüber ihren großen Koalitionspartnern durchsetzen? Wo mussten sie Abstriche machen? Welche Reformvorhaben wurden angedacht und welche wurden tatsächlich umgesetzt? Welche innerparteilichen Konflikte ergaben sich aus der neuen Rolle der Protestparteien? Letztendlich zeigt sich: Protestparteien scheitern nicht an ihrem schmalspurigen Programm, geringer Stammwählerschaft oder unerfahrenem Personal, sondern weil sie naturgemäß in die „Erwartungsfalle“ tappen. / “If a protest party assumes the responsibility of government its principles and demands will be put to the tough test of practical politics. The ensuing dilemma between standards and reality, its protest image and government policy often threatens to tear these parties apart. Taking four protest parties involved in government in Germany as an example, the following questions will be examined: What turns a party into a protest party? What were the reasons for the electoral successes of the Greens, the AL, the STATT party and the Schill party? What took place during the coalition negotiations? What demands were the protest parties successfully able to push through against their large coalition partners? On which points did they have to give in? What plans for reform were developed and which of them were actually implemented? What internal conflicts emerged within these parties after their role as protest parties changed? The final analysis comes to the following conclusion: Protest parties do not fail because of a narrow-minded programme, lack of electoral support or inexperienced staff, but because their very nature causes them to fall into the “expectation trap”.

A Lagrangian formalism presented by Hay, Ilinskii, Zabolotskaya, and Hamilton [J. Acoust. Soc. Am. 132, 124--137 (2012)] to calculate the pulsation of a spherical bubble, immersed in liquid and near one or two viscoelastic layers, is extended here to include bubble translation. The method presented here is simplified from that given by Hay et al. in that only a single interface between a liquid and a viscoelastic half-space is considered. In the present approach the force on the bubble due to the presence of the liquid-solid interface is calculated using a Green's function that takes into account elastic waves and viscosity in the layer, and the viscous boundary layer within the liquid near the interface. Previous models and experiments have shown that the direction of bubble translation near a viscoelastic layer is correlated with the direction of a liquid jet often produced by the bubble during collapse. In this dissertation an attempt is made to model the pulsation and translation of a spherical bubble near a liquid-solid interface to infer the direction of bubble translation in reference to material parameters of the liquid and viscoelastic medium, and the standoff distance of the bubble from the interface. The analysis is simplified by demonstrating that the direction of bubble translation can be inferred from the phase of the component of the Green's function associated with the reverberant pressure gradient. For linear bubble pulsation it is shown that the domain of material properties of the viscoelastic medium which generally corresponds to bubble translation away from the interface occurs when the effective stiffness of the viscoelastic medium is greater than the effective damping for both itself and the liquid. The analysis is performed assuming the viscoelastic medium is similar to soft tissue, and its dynamics are described by a Voigt, Kelvin, or Maxwell model. The simulations are compared with existing experimental data. Effects of high-amplitude bubble pulsation are explored in terms of how the simulations differ as the pulsation amplitude increases. At higher pulsation amplitudes, it is shown that bubble translation is still described qualitatively by analyzing the phase of the reverberant pressure gradient. / text

M. Tech. Agriculture. / Aims of this study was to select a suitable modified atmosphere packaging that retained the overall quality and bioactive compounds of the traditional leafy vegetables during storage. In this study, three types of biorientated polypropylene packaging namely BOPP04, BOPP05 and BOPP06 with different perforations were tested on retention of quality parameters (weight loss, leaf yellowing, colour L*, C*, h&#x00BA%x;), decay, chlorophyll a, chlorophyll b, bioactive compounds (carotenoids, ascorbic acid, total phenolic compounds), antioxidant scavenging activity, and sensory properties at 10 &#x00BA%x;C at 2 day intervals up to 14 days.Films without perforation, with macro perforation and unpacked leaves were included for comparison.

The fact that loosely bonded DNA bases could tolerate large structural fluctuations, form a dissipative environment for a charge traveling through the DNA. Nonlinear stochastic nature of structural fluctuations facilitates rich charge dynamics in DNA. We study the complex charge dynamics by solving a nonlinear, stochastic, coupled system of differential equations. Charge transfer between donor and acceptor in DNA occurs via different mechanisms depending on the distance between donor and acceptor. It changes from tunneling regime to a polaron assisted hopping regime depending on the donor-acceptor separation. Also we found that charge transport strongly depends on the feasibility of polaron formation. Hence it has complex dependence on temperature and charge-vibrations coupling strength. Mismatched base pairs, such as different conformations of the G・A mispair, cause only minor structural changes in the host DNA molecule, thereby making mispair recognition an arduous task. Electron transport in DNA that depends strongly on the hopping transfer integrals between the nearest base pairs, which in turn are affected by the presence of a mispair, might be an attractive approach in this regard. I report here on our investigations, via the I –V characteristics, of the effect of a mispair on the electrical properties of homogeneous and generic DNA molecules. The I –V characteristics of DNA were studied numerically within the double-stranded tight-binding model. The parameters of the tight-binding model, such as the transfer integrals and on-site energies, are determined from first-principles calculations. The changes in electrical current through the DNA chain due to the presence of a mispair depend on the conformation of the G・A mispair and are appreciable for DNA consisting of up to 90 base pairs. For homogeneous DNA sequences the current through DNA is suppressed and the strongest suppression is realized for the G(anti)・A(syn) conformation of the G・A mispair. For inhomogeneous (generic) DNA molecules, the mispair result can be either suppression or an enhancement of the current, depending on the type of mispairs and actual DNA sequence.