Through the introduction of the American poem "I Hear America Singing" and its writer Walt Whitman, the Chinese poem " 春望 "and its writer:杜甫, and the comparison of these two poems in prosody, l...Through the introduction of the American poem "I Hear America Singing" and its writer Walt Whitman, the Chinese poem " 春望 "and its writer:杜甫, and the comparison of these two poems in prosody, language, contents and emotion, writing techniques, political views field, etc, this essay analyses further some poetic phenomenon, and also draws a vivid picture of America in 19 century and China in 8 century.展开更多
Aim Isolation and structural elucidation of the constituents from the dried flower buds of Magnolia biondii Pamp. Methods Column chromatography and TLC were used to isolate chemical constituents. Spectroscopic methods...Aim Isolation and structural elucidation of the constituents from the dried flower buds of Magnolia biondii Pamp. Methods Column chromatography and TLC were used to isolate chemical constituents. Spectroscopic methods were employed for structural elucidation. Results One benzo furanoid neolignan （licarin B） and two bisepoxy lignans （magnolin, fargesin） were isolated and identified. Conclusion Licarin B is the first reported benzofuranoid lignan from the family Magnoliaceae.展开更多
Following a series of surveys since 2003, a full-seasonal raptor count was undertaken at Baiwangshan, a mountain in the vicinity of Beijing, from 6 March to 22 May 2009, when 3802 individual birds of 23 species were r...Following a series of surveys since 2003, a full-seasonal raptor count was undertaken at Baiwangshan, a mountain in the vicinity of Beijing, from 6 March to 22 May 2009, when 3802 individual birds of 23 species were recorded. Four species, i.e., Oriental Honey Buzzard(Pernis ptilorhynchus), Common Buzzard(Buteo buteo), Eurasian Sparrow Hawk(Accipiter nisus) and Gray-faced Buzzard(Butastur indicus) together accounted for up 90% of the total and P. ptilorhynchus alone for 70%. Raptor passage of such magnitude and diversity at an inland site in China was unheard of up to then. As well, 113 other migrants were recorded at the site during this period, including 24 water birds, 74 passerines and 15 others(cuckoos, owls and other migrants).展开更多
文摘Through the introduction of the American poem "I Hear America Singing" and its writer Walt Whitman, the Chinese poem " 春望 "and its writer:杜甫, and the comparison of these two poems in prosody, language, contents and emotion, writing techniques, political views field, etc, this essay analyses further some poetic phenomenon, and also draws a vivid picture of America in 19 century and China in 8 century.
文摘Aim Isolation and structural elucidation of the constituents from the dried flower buds of Magnolia biondii Pamp. Methods Column chromatography and TLC were used to isolate chemical constituents. Spectroscopic methods were employed for structural elucidation. Results One benzo furanoid neolignan （licarin B） and two bisepoxy lignans （magnolin, fargesin） were isolated and identified. Conclusion Licarin B is the first reported benzofuranoid lignan from the family Magnoliaceae.
文摘Following a series of surveys since 2003, a full-seasonal raptor count was undertaken at Baiwangshan, a mountain in the vicinity of Beijing, from 6 March to 22 May 2009, when 3802 individual birds of 23 species were recorded. Four species, i.e., Oriental Honey Buzzard(Pernis ptilorhynchus), Common Buzzard(Buteo buteo), Eurasian Sparrow Hawk(Accipiter nisus) and Gray-faced Buzzard(Butastur indicus) together accounted for up 90% of the total and P. ptilorhynchus alone for 70%. Raptor passage of such magnitude and diversity at an inland site in China was unheard of up to then. As well, 113 other migrants were recorded at the site during this period, including 24 water birds, 74 passerines and 15 others(cuckoos, owls and other migrants).
