- 著者
- Rong Chen Ping Xu Peipei Song Meifeng Wang Jiangjiang He
- 出版者
- International Research and Cooperation Association for Bio & Socio-Sciences Advancement
- 雑誌
- BioScience Trends (ISSN:18817815)
- 巻号頁・発行日
- vol.13, no.4, pp.287-291, 2019-08-31 (Released:2019-09-17)
- 参考文献数
- 21
- 被引用文献数
- 10 81
The aging of a population structure is an inevitable path of demographic transition, as an inescapable result of decline in fertility rate and extension in life expectancy. Although demographic transition occurred earlier in Japan than in China, the two countries had similar patterns, both of which took a much shorter period of time than Western countries to complete demographic transition, as well as have been aging at a rapid speed that has rarely been seen in the world. Japan has the highest level of population aging in the world, and China has been experiencing a very fast pace of the population aging process and has the largest older population. Drawing upon data from World Population Prospects (2019), this paper compares changes in population aging in both China and Japan. Findings show that Japan's aging process is 30 years ahead of China, but China has been changing in a similar way as Japan. To be specific, both countries experienced four phases of the population aging process: accelerated development period, rapid development period, slow down period and high-level maintained period. In addition, both countries had a quick growing rate of population aging. It will take China 23 years and 10 years respectively for the aging rate increasing from 7% to 14% and then to 20%, while Japan took 24 and 11 years respectively, which is much shorter than developed countries in the West. Furthermore, China has a faster pace than Japan in population aging in the next 25 years. We found that from 2019-2044, China's aging rate, elderly dependency ratio, oldest-old coefficient and median age of population will increase 13.24 percent points, 24.21 percent points, 8.33 percent points, and 8.47 years, while the four indicators of Japan will increase 8.38 percent points, 22.52 percent points, 8.29 percent points, and 6.20 years, respectively.
- 著者
- Qin-Fan LI Cai-Ju HAO Yong-Ping XU Jie LIANG Kai YANG Zhong-Hua CUI
- 出版者
- JAPANESE SOCIETY OF VETERINARY SCIENCE
- 雑誌
- Journal of Veterinary Medical Science (ISSN:09167250)
- 巻号頁・発行日
- pp.1203220797, (Released:2012-03-26)
- 被引用文献数
- 5 8
By a series of experiments, we identified a new member of locoweed family, Oxytropis serioopetala, which produces swainsonine, a phytotoxin harmful to livestock. In order to evaluate the toxicity of Oxytropis serioopetala, its extract was administered to ten rabbits by gavage at a dose of 1.5 mg/kg body weight as swainsonine once daily. After the 20th day, the rabbits appeared depressive and anorexia. Besides, intention tremors were apparent upon move. Their eyes were dull. The rear limbs were severely weak and even progressed to partial paresis. Activities of serum aspartate aminotransferase (AST), alanine transaminase (ALT), alkaline phosphatase (AKP) and urea nitrogen (BUN) levels in the poisoned rabbits increased significantly. Serum α-mannosidase (AMA) activity decreased markedly. Pathomorphological lesions in the locoweed-poisoned rabbits developed severe microvacuolation of visceral and neurological tissue. The extensive vacuolation was observed in liver, kidney and brain. These clinical and pathological features are similar to the symptoms of locoism.