Hippeastrum (Hippeastrum hybridum), a native of Central and South America, is a bulbous ornamental flowering plant in the Amaryllidaceae family. However, the correct balance of NH4 to NO3-nitrogen in a fertilizer mix ...Hippeastrum (Hippeastrum hybridum), a native of Central and South America, is a bulbous ornamental flowering plant in the Amaryllidaceae family. However, the correct balance of NH4 to NO3-nitrogen in a fertilizer mix for Hippeastrum plants is largely unknown. Nitrogen was applied 2x weekly following irrigation at either 0.6 g (high), 0.3 g (medium) or 0.15 g (low) total N every four months. Nitrogen was supplied in different combinations of NO3 and/or NH4. Nitrate:NH4-N ratios were either 100% NO3:0% NH4 (100NO3), 70% NO3:30% NH4 (70NO3), 50% NO3:50% NH4 (50NO3) (second group only), 30%NO3:70%NH4 (30NO3), or 0% NO3/100% NH4 (100NH4). Growth in bulb diameter after one year of fertilizer treatments not only increased from 0.15 to 0.6 g N (low to high level), but also differed with the form of N supplied to the plant. The largest diameter bulbs were produced in the 70NO3 and 50NO3 high N treatments. Within any NO3/NH4-N ratio grouping, fertilization at the high N rate resulted in larger diameter bulbs. No significant differences existed between treatments in the number of bulbs produced. Bulb growth was greater with a portion of N supplied as NO3 than with NH4-N alone. These results indicate that application of N as a mixture of NH4 and NO3 at 0.6 g per 4 months produces the largest increase in bulb diameter.展开更多
Sustainable development is seen as a way to end extreme poverty, promote economic growth, and advance environmental sustainability and reduce gender inequality. Sustainable development is embedded in the Gross Domesti...Sustainable development is seen as a way to end extreme poverty, promote economic growth, and advance environmental sustainability and reduce gender inequality. Sustainable development is embedded in the Gross Domestic Product （GDP） of a nation and GDP is used as an indicator of the economic health of a country and also as a way of measuring a country＇s standard of living. Accelerating sustainable development requires the involvement of businesses to play a role in creating economic growth and job creation. The understanding is that when businesses invest in capital that is used in the production of goods, they create employment which in turn helps boost the people＇s standard of living as they earn some income. However, accelerating sustainable development has a beating on employee empowerrnent where workers are paid living wages to meet their fundamental needs, job security, and right to join a trade union and working in an environment free of sexual harassment.展开更多
Known as the Pearl of the Antilles, Haiti was the first black republic to win its independence from the French in an uprising by slaves. Two hundred years after the revolt, Haiti＇s children, the most vulnerable popul...Known as the Pearl of the Antilles, Haiti was the first black republic to win its independence from the French in an uprising by slaves. Two hundred years after the revolt, Haiti＇s children, the most vulnerable population of the nation, endure modem day slavery. Extreme social, economic, and political instability have led the country to adopt and accept this practice. This qualitative study reveals audiences＇ narratives of their experiences as guardians of Restaveks and their reflections after watching the documentary film Blooming Hope （2010）. The documentary features Tata Dumasie, an artisan woman who narrates her life story growing up as a Restavek. This ethnographic research concludes that documentary films serve as tools for popular education. Furthermore, narrative discourse can reconstruct identities of former Restaveks and positively transform guardians＇ perceptions of the Restavek phenomenon.展开更多
Spinal cord injury （SCl） in mammals results in functional deficits that are mostly permanent due in part to the inability of severed axons to regenerate. Several types of growth-inhibitory molecules expressed at the...Spinal cord injury （SCl） in mammals results in functional deficits that are mostly permanent due in part to the inability of severed axons to regenerate. Several types of growth-inhibitory molecules expressed at the injury site contribute to this regeneration failure. The responses of axons to these inhibitors vary greatly within and between organisms, reflecting axons＇ characteristic intrinsic propensity for regeneration. In the zebrafish （Danio rerio） many but not all axons exhibit successful regeneration after SCI. This review presents and compares the intrinsic and extrinsic determinants of axonal regeneration in the injured spinal cord in mammals and zebrafish. A better understanding of the molecules and molecular pathways underlying the remarkable individualism among neurons in mature zebrafish may support the development of therapies for SCI and their translation to the clinic.展开更多
文摘Hippeastrum (Hippeastrum hybridum), a native of Central and South America, is a bulbous ornamental flowering plant in the Amaryllidaceae family. However, the correct balance of NH4 to NO3-nitrogen in a fertilizer mix for Hippeastrum plants is largely unknown. Nitrogen was applied 2x weekly following irrigation at either 0.6 g (high), 0.3 g (medium) or 0.15 g (low) total N every four months. Nitrogen was supplied in different combinations of NO3 and/or NH4. Nitrate:NH4-N ratios were either 100% NO3:0% NH4 (100NO3), 70% NO3:30% NH4 (70NO3), 50% NO3:50% NH4 (50NO3) (second group only), 30%NO3:70%NH4 (30NO3), or 0% NO3/100% NH4 (100NH4). Growth in bulb diameter after one year of fertilizer treatments not only increased from 0.15 to 0.6 g N (low to high level), but also differed with the form of N supplied to the plant. The largest diameter bulbs were produced in the 70NO3 and 50NO3 high N treatments. Within any NO3/NH4-N ratio grouping, fertilization at the high N rate resulted in larger diameter bulbs. No significant differences existed between treatments in the number of bulbs produced. Bulb growth was greater with a portion of N supplied as NO3 than with NH4-N alone. These results indicate that application of N as a mixture of NH4 and NO3 at 0.6 g per 4 months produces the largest increase in bulb diameter.
文摘Sustainable development is seen as a way to end extreme poverty, promote economic growth, and advance environmental sustainability and reduce gender inequality. Sustainable development is embedded in the Gross Domestic Product （GDP） of a nation and GDP is used as an indicator of the economic health of a country and also as a way of measuring a country＇s standard of living. Accelerating sustainable development requires the involvement of businesses to play a role in creating economic growth and job creation. The understanding is that when businesses invest in capital that is used in the production of goods, they create employment which in turn helps boost the people＇s standard of living as they earn some income. However, accelerating sustainable development has a beating on employee empowerrnent where workers are paid living wages to meet their fundamental needs, job security, and right to join a trade union and working in an environment free of sexual harassment.
文摘Known as the Pearl of the Antilles, Haiti was the first black republic to win its independence from the French in an uprising by slaves. Two hundred years after the revolt, Haiti＇s children, the most vulnerable population of the nation, endure modem day slavery. Extreme social, economic, and political instability have led the country to adopt and accept this practice. This qualitative study reveals audiences＇ narratives of their experiences as guardians of Restaveks and their reflections after watching the documentary film Blooming Hope （2010）. The documentary features Tata Dumasie, an artisan woman who narrates her life story growing up as a Restavek. This ethnographic research concludes that documentary films serve as tools for popular education. Furthermore, narrative discourse can reconstruct identities of former Restaveks and positively transform guardians＇ perceptions of the Restavek phenomenon.
基金supported by United States Department of Defense grant W81XWH-11-1-0645
文摘Spinal cord injury （SCl） in mammals results in functional deficits that are mostly permanent due in part to the inability of severed axons to regenerate. Several types of growth-inhibitory molecules expressed at the injury site contribute to this regeneration failure. The responses of axons to these inhibitors vary greatly within and between organisms, reflecting axons＇ characteristic intrinsic propensity for regeneration. In the zebrafish （Danio rerio） many but not all axons exhibit successful regeneration after SCI. This review presents and compares the intrinsic and extrinsic determinants of axonal regeneration in the injured spinal cord in mammals and zebrafish. A better understanding of the molecules and molecular pathways underlying the remarkable individualism among neurons in mature zebrafish may support the development of therapies for SCI and their translation to the clinic.
