53,442 research outputs found

    Di sawah-sawah di Tabanan, Bali

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    Fearless: Sneha Shrestha

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    Sneha Shrestha ’10, a native to Kathmandu, Nepal, recently received an Advancing Leaders Fellowship from World Learning for her fearless project. With it, she aims to provide a creative outlet for art and culture among young people in Nepal through the Kathmandu Children’s Art Museum (KCAM). This project will support a creative learning space for children as well as an opportunity for them to express themselves and investigate their own culture through art. [excerpt

    A study of effects of low temperature stress on seed development and yield in wheat (Triticum aestivam L.) : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science in Seed Technology at Massey University

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    Temperature affects the growth, development, fertility and yield of cereals. The degree of sterility and subsequent yield reduction caused by extreme temperature stress depends upon the minimum level and duration of the stress temperature applied and the stage of plant development at the time of stress. An experiment was conducted in which three low temperature regimes (-4°, -2°C and +3°C) were applied at 5 different stages of plant growth (from 1 day before anthesis to 9 days after anthesis) for a period of 6 hours with pre- and post- conditioning periods of 6 and 4 hours respectively. The results showed that the minimum temperature reached determined the nature and severity of temperature injury in Karamu wheat. Complete floret sterility was evident when a -4°C temperature was imposed at the pre-anthesis or anthesis stages of plant development; florets in any position of the head being equally affected. A -4°C temperature stress applied 3 days after anthesis produced 50% and 5% seed formation in primary and secondary heads, respectively. This seed formation mainly occurred in the basal florets of the apical and central spikelets of the head, however the seeds formed did not develop after stress and subsequent viable seed yield was zero. At the later stages, 6 or 9 days after anthesis a -4°C temperature stress had no significant effect on seed numbers. However there was a substantial negative effect on seed development and viability so that subsequent viable seed yield was zero. Temperature stresses of +3°C and -2°C had no significant effects on seed formation, development and viable seed yield when stresses were applied at any of the stages of plant development tested. The percentage of seed formation was highest in the two basal florets of the central and apical portions of the head compared to that in the two basal florets of the bottom of the head and to the distal florets of all spikelets. The percentage sterility in terms of relative sterility (percentage 'D + R' type ovules) and sterility index (percentage 'D' type ovules) was also described. It was found that in 'Karamu' wheat 16% to 33% rudimentary florets were a common feature, such structures included tiny basal, sterile spikelets and the terminal florets of all spikelets. Morphological and anatomical differences in ovules harvested at different stages of development from different treatments were observed. Ovules were classified into 6 groups for assessment of seed development. (A = apparently not fertilised, B = swollen and conical shaped, C = developing, D = shrivelled and shrunken, E = shrunken with reduced conical shape, R = rudimentary). Possible pathways to seed formation and development can be estimated from the data. A probable pathway to normal seed development is A to B to C. However, in the case of unsuccessful seed formation and development, the pathway is likely to be A to D,A to B to D or A to B to C to D. Further detailed electron microscope work is needed to enable a complete description and understanding of the pathways of seed development in stressed and unstressed plants. Such knowledge is needed to provide a logical basis for the development of cultivars with increased cold tolerance, fertility and yield

    Book Review: Language Planning and Policy in the Pacific, Vol. 1: Fiji, The Philippines and Vanuatu by Richard B. Baldauf, Jr. and Robert B. Kaplan

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    RICHARD B. BALDAUF JR. AND ROBERT B. KAPLAN (Eds.). Language Planning and Policy in the Pacific, Vol. 1: Fiji, The Philippines and Vanuatu. Clevedon, UK: Multilingual Matters Ltd., 2006. pp. 239. Hb £ 34.95. pp 369 - 371

    Antiferromagnetism in a bosonic mixture of rubidium (87^{87}Rb) and potassium (41^{41}K)

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    We simulate the experimental possibility of observing the antiferromagnetic (AF) order in the bosonic mixtures of rubidium (87^{87}Rb) and potassium (41^{41}K) in a two-dimensional optical lattice in the presence of harmonic confinement. By tuning the interspecies interactions and the lattice heights we have found the ground states, within the mean-field approximation, that interpolate from the phase separation to the AF order. For a moderate lattice height the coexistence of the Mott and AF phase is possible for the Rb atoms while the K atoms remain in the AF-superfluid phase. This observation may provide an experimental feasibility to hitherto unobserved AF order for 87^{87}Rb - 41^{41}K mixture.Comment: 4 pages, 4 figures, accepted for PRA rapid communicatio

    Preparation of Lapsi (Choerospondias axillaries roxb.) pulp using IMF technology and study on storage stability

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    The work was carried out to study the storage stability and food safety aspects of lapsi (Choerospondias axillaries roxb.) pulp stock prepared using Intermediate Moisture Food Technology. Three recipes were designed with the TSS of 55, 60 and 65 oBx and the TSS/Acidity ratio of 20, 25 and 30 respectively so as to achieve the theoretical water activity level of 0.86 to 0.90. Further three treatments using no preservative, potassium sorbate (0.3%) as preservative and pasteurisation with hot filling were done to those recipes. All samples were found to be safe from the food poisoning organism Staphylococcus aureus. All preservative added and pasteurised samples as well as 65 oBx sample with no preservative were stable up to 5 months storage and no Mold growth were observed. Mold observed after 2 month in 55 oBx sample and after 69th day in 60 oBx sample with no preservative. Preservative added samples were faint in colour while pasteurised samples were dark due to browning reaction during heating. No preservative used sample was best in appearance. 65 oBx with no preservative sample was good design but protection from air to prevent browning and use of sorbate to further extend shelf life was found necessary
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