[Objective] This study aimed to find methods suitable for the preservation and conidia production of Ustilaginoidea virens. [Method] Six different preservation methods were tested by checking at three month interval f...[Objective] This study aimed to find methods suitable for the preservation and conidia production of Ustilaginoidea virens. [Method] Six different preservation methods were tested by checking at three month interval for the viability and sporulation, and seven liquid media of different composition were tested by shaking cul- ture at 150 r/min. [Result] Among the six methods studied, the periodic transfer and paraffin oil overlay were suitable, and the fungus could survive more than 12 months. The conidia concentration went up to 7.25×10^7 conidia/ml after 9 d in the PSB liquid medium, indicating that PSB was the best medium for conidia production. [Conclusion] This study provides a theoretical basis for the preservation and conidia production of U. virens.展开更多
Sipunculus nudus is an important economic species because of its high nutritional and medicinal values. The exploitation and utilization of S. nudus primarily occur in the coastal regions of the Beibu Gulf. However, w...Sipunculus nudus is an important economic species because of its high nutritional and medicinal values. The exploitation and utilization of S. nudus primarily occur in the coastal regions of the Beibu Gulf. However, wild resource of S. nudus is rapidly decreasing because of the overexploitation, which has led to considerable developments of artificial breeding techniques. The cultivation scale of S. nudus has increased in response to successful artificial breeding; however, methods for culturing S. nudus in tidal flats or ponds require further study. Most studies have focused on the breeding, nutrition, medical value and ecological impact of these worms. Studies on the distribution, sediment requirements, nutrition characteristics, breeding techniques and aquaculture ecology of this species are summarized in this paper to promote the development of the aquaculture industry for S. nudus. The high biomass of S. nudus in the Beibu Gulf is positively correlated with the sediment characteristics and water quality of the region. The production of peanut worm has improved to some extent through culturing; however, the nutrient value and ecological environment problems have been observed, which reflect the over exploitation of trace elements and the sediment. These problems will worsen unless they are resolved, and the release of organic materials, nitrogen and phosphorus during harvesting impacts the coastal environment. Moreover, genetic erosion is a potential risk for larvae in artificial breeding programs in tidal flats. Therefore, culturing and collecting methods should be improved and the wild resource conservation should be implemented to promote the sustainable development of the peanut worm.展开更多
In this paper we investigate the possibility of pareto improving social security reforms within a framework of endogenous growth. Belan et al. proposed a transition from a pay-as-you-go(PAYG) pension system to a syste...In this paper we investigate the possibility of pareto improving social security reforms within a framework of endogenous growth. Belan et al. proposed a transition from a pay-as-you-go(PAYG) pension system to a system of saving-subsidization. We follow this approach and prove that a pareto improving conversion from the PAYG system to a fully funded system is possible and discuss the problem of implementing the transition to the fully funded system.展开更多
The study aimed at evaluating the nutrient and nutraceutical potentials of the selected seaweed biomass namely Ulva lactuca and Kappaphycus alvarezii. The selected seaweeds were found to be rich in macro and micronutr...The study aimed at evaluating the nutrient and nutraceutical potentials of the selected seaweed biomass namely Ulva lactuca and Kappaphycus alvarezii. The selected seaweeds were found to be rich in macro and micronutrients. Kappaphycus contained high amount of ash when compared to U. lactuca. It is revealed that the mercury level in U. lactuca was 0.017 ppm and it was not detected in K. alvarezii. The heavy metal concentration in the selected seaweeds was within the tolerable value reported as quality criteria for edible seaweeds. These seaweeds were also found to be rich sources of vitamin antioxidants namely Vitamin C, total carotenoid, beta carotene, total chlorophyll and polyphenol. The phytochemical screening of the selected seaweeds showed that both seaweeds contained carbohydrates, protein, gums and mulicage, phenols, starch and quinones. Alkaloids was absent in Kappaphycus, saponins was moderate in U. actuca when compared to Kappaphycus. Glycosides, flavonoids, tannins and terpenoids were absent in both the species. The selected seaweeds also possess antibacterial activity. The selected biomass could be recommended for use in dietaries to combat protein energy malnutrition and in particular micronutrient deficiencies.展开更多
With the rapid development of economy in our country, the level of science and technology innovation, all of these prolong the life span of our life. Thus an aging population are increasingly highlight, which are deep...With the rapid development of economy in our country, the level of science and technology innovation, all of these prolong the life span of our life. Thus an aging population are increasingly highlight, which are deeply and widely influenced our society, economy, life and other aspects. As the basic insurance which maintain the elderly＇s life quality after they retired, Pension insurance will promove social stability and development. How to reform Pension insurance under the background of the aging of the population will get more and more attention from people. This article starts with the concept of the aging of the population and its development trend. Next, the article analyses the problems of Pension Insurance under the background of the aging of the population. Last, the article summarizes countermeasures according to solve these matters.展开更多
基金Supported by the Programs of Guizhou Academy of Agricultural Sciences in China [No. QianNongKeYuan(2010) 033 and No.QianNongKeHe 07016]the Programs of Science and Technology Department of Guizhou Province [No.QianKeHe J(2009) 2103,and No.QianKeHe NY(2012) 3031]Science and Technology Project of Guizhou Province [QKH Major Project(2012) 6012]~~
文摘[Objective] This study aimed to find methods suitable for the preservation and conidia production of Ustilaginoidea virens. [Method] Six different preservation methods were tested by checking at three month interval for the viability and sporulation, and seven liquid media of different composition were tested by shaking cul- ture at 150 r/min. [Result] Among the six methods studied, the periodic transfer and paraffin oil overlay were suitable, and the fungus could survive more than 12 months. The conidia concentration went up to 7.25×10^7 conidia/ml after 9 d in the PSB liquid medium, indicating that PSB was the best medium for conidia production. [Conclusion] This study provides a theoretical basis for the preservation and conidia production of U. virens.
基金the National Natural Sci-ence Foundation of China (No. 41606137)Natural Science Foundation of Guangdong Province (No. 2015A030 310260)+2 种基金the Scientific Research Funds for Central Non-profit Institutes, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences (Nos. 2014ZD01, 2013ZD01)the Marine Fishery Science and Technology Industry Projects from Guangdong Province (Nos. B201601-01, B201500B 04)the Science and Technology Plan Projects from Guangdong Province (Nos. 2013B090500081 and 2013B 040500020)
文摘Sipunculus nudus is an important economic species because of its high nutritional and medicinal values. The exploitation and utilization of S. nudus primarily occur in the coastal regions of the Beibu Gulf. However, wild resource of S. nudus is rapidly decreasing because of the overexploitation, which has led to considerable developments of artificial breeding techniques. The cultivation scale of S. nudus has increased in response to successful artificial breeding; however, methods for culturing S. nudus in tidal flats or ponds require further study. Most studies have focused on the breeding, nutrition, medical value and ecological impact of these worms. Studies on the distribution, sediment requirements, nutrition characteristics, breeding techniques and aquaculture ecology of this species are summarized in this paper to promote the development of the aquaculture industry for S. nudus. The high biomass of S. nudus in the Beibu Gulf is positively correlated with the sediment characteristics and water quality of the region. The production of peanut worm has improved to some extent through culturing; however, the nutrient value and ecological environment problems have been observed, which reflect the over exploitation of trace elements and the sediment. These problems will worsen unless they are resolved, and the release of organic materials, nitrogen and phosphorus during harvesting impacts the coastal environment. Moreover, genetic erosion is a potential risk for larvae in artificial breeding programs in tidal flats. Therefore, culturing and collecting methods should be improved and the wild resource conservation should be implemented to promote the sustainable development of the peanut worm.
文摘In this paper we investigate the possibility of pareto improving social security reforms within a framework of endogenous growth. Belan et al. proposed a transition from a pay-as-you-go(PAYG) pension system to a system of saving-subsidization. We follow this approach and prove that a pareto improving conversion from the PAYG system to a fully funded system is possible and discuss the problem of implementing the transition to the fully funded system.
文摘The study aimed at evaluating the nutrient and nutraceutical potentials of the selected seaweed biomass namely Ulva lactuca and Kappaphycus alvarezii. The selected seaweeds were found to be rich in macro and micronutrients. Kappaphycus contained high amount of ash when compared to U. lactuca. It is revealed that the mercury level in U. lactuca was 0.017 ppm and it was not detected in K. alvarezii. The heavy metal concentration in the selected seaweeds was within the tolerable value reported as quality criteria for edible seaweeds. These seaweeds were also found to be rich sources of vitamin antioxidants namely Vitamin C, total carotenoid, beta carotene, total chlorophyll and polyphenol. The phytochemical screening of the selected seaweeds showed that both seaweeds contained carbohydrates, protein, gums and mulicage, phenols, starch and quinones. Alkaloids was absent in Kappaphycus, saponins was moderate in U. actuca when compared to Kappaphycus. Glycosides, flavonoids, tannins and terpenoids were absent in both the species. The selected seaweeds also possess antibacterial activity. The selected biomass could be recommended for use in dietaries to combat protein energy malnutrition and in particular micronutrient deficiencies.
文摘With the rapid development of economy in our country, the level of science and technology innovation, all of these prolong the life span of our life. Thus an aging population are increasingly highlight, which are deeply and widely influenced our society, economy, life and other aspects. As the basic insurance which maintain the elderly＇s life quality after they retired, Pension insurance will promove social stability and development. How to reform Pension insurance under the background of the aging of the population will get more and more attention from people. This article starts with the concept of the aging of the population and its development trend. Next, the article analyses the problems of Pension Insurance under the background of the aging of the population. Last, the article summarizes countermeasures according to solve these matters.
