On some necessary conditions for double pyramidal central configurations with concave heptagon for any given ratio of masses, the existence and uniqueness of a class of double pyramidal central configurations with con...On some necessary conditions for double pyramidal central configurations with concave heptagon for any given ratio of masses, the existence and uniqueness of a class of double pyramidal central configurations with concave heptagon base for nine-body problems is proved in this paper, and the range of the ratio cr of the circularity radius of the heptagon to the half-height of the double pyramidal central configuration involved in this class configurations is obtained, which is in the interval （√3/3,1.099 600 679）, and the configuration involved in the bodies with any σ∈ （√3/3, 1.099 600 679） can form a central configuration which is a uniquely central configuration is proved.展开更多
It is an inevitable trend to replace the traditional agriculture with modern agricultural science and technology park, but the excessively unified development mode, similar functions and feature loss of modern science...It is an inevitable trend to replace the traditional agriculture with modern agricultural science and technology park, but the excessively unified development mode, similar functions and feature loss of modern science and technology park have become the obstacles to its development. As a kind of structure view element with the highest life attributes, plants can make the modern agricultural science and technology park have more vitality. Therefore, combined with the case study of Jiuxi Agricultural Science and Technology Park, the modern agricultural science and technology park planning was analyzed based on the perspective of plant experience, with the aim to provide bases for the planning of featured modern leisure science and technology park.展开更多
Schools and parents should pay attention to health education for students＇ health awareness and good health habits, to establish a correct concept of health. School mental health education should be the first place; ...Schools and parents should pay attention to health education for students＇ health awareness and good health habits, to establish a correct concept of health. School mental health education should be the first place; school should create a positive learning environment for students to get knowledge and skills of exercising. Especially in the nine years of compulsory education stage, we should ensure necessary physical exercise, reasonable arrangements for extracurricular activities to improve students＇ physical fitness. We should improve the school＇ s sports facilities, and create a good campus atmosphere. Schools should actively carry out extra-curricular sports activities, improve the level of quality of physical education teachers, develop students＇ sports consciousness, and improve material conditions for the students to create a good learning environment, meanwhile, we should increase the content of education, and enrich the content of physical education to enable students to select and reach more sports.展开更多
Haliotis diversicolor Reeve is one of the most important mollusks cultured in South China. Preliminary genetic linkage maps were constructed with amplified fragment length polymorphism (AFLP) markers. A total of 2 596...Haliotis diversicolor Reeve is one of the most important mollusks cultured in South China. Preliminary genetic linkage maps were constructed with amplified fragment length polymorphism (AFLP) markers. A total of 2 596 AFLP markers were obtained from 28 primer combinations in two parents and 78 offsprings. Among them, 412 markers (15.9%) were polymorphic and segregated in the mapping family. Chi-square tests showed that 151 (84.4%) markers segregated according to the expected 1:1 Mendelian ratio (P<0.05) in the female parent, and 200 (85.8%) in the male parent. For the female map, 179 markers were used for linkage analysis and 90 markers were assigned to 17 linkage groups with an average interval length of 25.7 cm. For the male map, 233 markers were used and 94 were mapped into 18 linkage groups, with an average interval of 25.0 cm. The estimated genome length was 2 773.0 cm for the female and 2 817.1 cm for the male map. The observed length of the linkage map was 1 875.2 cm and 1 896.5 cm for the female and male maps, respectively. When doublets were considered, the map length increased to 2 152.8 cm for the female and 2 032.7 cm for the male map, corresponding to genome coverage of 77.6% and 72.2%, respectively.展开更多
In the present study, we, for the first time, developed an UPLC-IT-TOF/MS method to compare the chemical constituents of the flower buds of Lonicera japonica Thunb. （Jinyinhua, JYH, in Chinese） and its tetraploid cu...In the present study, we, for the first time, developed an UPLC-IT-TOF/MS method to compare the chemical constituents of the flower buds of Lonicera japonica Thunb. （Jinyinhua, JYH, in Chinese） and its tetraploid cultivar Jiufengyihao （JFYH）. The samples were separated on a C18 ultra-column （100 mm×2.1 ram, 1.8 μm） eluted with a mixture of acetonitrile and 0.1% formic acid using a gradient program. Based on the accurate masses, fragmental MS2 ions and fragmentation pathway, we unambiguously affirmed or tentatively identified 30 compounds, including 11 phenolic acids, 10 iridoid glycosides, 8 fiavonoids and 1 saponin, from JYH and JFYH. Among them, all compounds were detected in Lonicerajaponica, but only 21 compounds were detected in JFYH. In addition, the relative contents of the 21 common chemical constituents were also different in JYH and JFYH, suggesting an obvious chemical difference between JYH and JFYH.展开更多
基金Funded by NSF (Natural Science Foundation) of China (No. 10231010) and NSF of Chongqing Educational Committee (KJ051109, KJ06110X), NSF of Chongqing Science and Technology Committee, NSF of CQSXXY
文摘On some necessary conditions for double pyramidal central configurations with concave heptagon for any given ratio of masses, the existence and uniqueness of a class of double pyramidal central configurations with concave heptagon base for nine-body problems is proved in this paper, and the range of the ratio cr of the circularity radius of the heptagon to the half-height of the double pyramidal central configuration involved in this class configurations is obtained, which is in the interval （√3/3,1.099 600 679）, and the configuration involved in the bodies with any σ∈ （√3/3, 1.099 600 679） can form a central configuration which is a uniquely central configuration is proved.
文摘It is an inevitable trend to replace the traditional agriculture with modern agricultural science and technology park, but the excessively unified development mode, similar functions and feature loss of modern science and technology park have become the obstacles to its development. As a kind of structure view element with the highest life attributes, plants can make the modern agricultural science and technology park have more vitality. Therefore, combined with the case study of Jiuxi Agricultural Science and Technology Park, the modern agricultural science and technology park planning was analyzed based on the perspective of plant experience, with the aim to provide bases for the planning of featured modern leisure science and technology park.
文摘Schools and parents should pay attention to health education for students＇ health awareness and good health habits, to establish a correct concept of health. School mental health education should be the first place; school should create a positive learning environment for students to get knowledge and skills of exercising. Especially in the nine years of compulsory education stage, we should ensure necessary physical exercise, reasonable arrangements for extracurricular activities to improve students＇ physical fitness. We should improve the school＇ s sports facilities, and create a good campus atmosphere. Schools should actively carry out extra-curricular sports activities, improve the level of quality of physical education teachers, develop students＇ sports consciousness, and improve material conditions for the students to create a good learning environment, meanwhile, we should increase the content of education, and enrich the content of physical education to enable students to select and reach more sports.
基金Supported by the National Basic Research Program of China (973 Program) (Nos. 2010CB126405 and 2009CB126005)the Key Project for International Science and Technology Cooperation, Ministry of Science and Technology of China (No. 2004DFA07200)+2 种基金the Great Science and Technique Program of Hainan Province (No. 06120)the Hainan Key Laboratory of Tropical Hydrobiological Technology (No. shkyjj0810)supported by the Rutgers University
文摘Haliotis diversicolor Reeve is one of the most important mollusks cultured in South China. Preliminary genetic linkage maps were constructed with amplified fragment length polymorphism (AFLP) markers. A total of 2 596 AFLP markers were obtained from 28 primer combinations in two parents and 78 offsprings. Among them, 412 markers (15.9%) were polymorphic and segregated in the mapping family. Chi-square tests showed that 151 (84.4%) markers segregated according to the expected 1:1 Mendelian ratio (P<0.05) in the female parent, and 200 (85.8%) in the male parent. For the female map, 179 markers were used for linkage analysis and 90 markers were assigned to 17 linkage groups with an average interval length of 25.7 cm. For the male map, 233 markers were used and 94 were mapped into 18 linkage groups, with an average interval of 25.0 cm. The estimated genome length was 2 773.0 cm for the female and 2 817.1 cm for the male map. The observed length of the linkage map was 1 875.2 cm and 1 896.5 cm for the female and male maps, respectively. When doublets were considered, the map length increased to 2 152.8 cm for the female and 2 032.7 cm for the male map, corresponding to genome coverage of 77.6% and 72.2%, respectively.
文摘In the present study, we, for the first time, developed an UPLC-IT-TOF/MS method to compare the chemical constituents of the flower buds of Lonicera japonica Thunb. （Jinyinhua, JYH, in Chinese） and its tetraploid cultivar Jiufengyihao （JFYH）. The samples were separated on a C18 ultra-column （100 mm×2.1 ram, 1.8 μm） eluted with a mixture of acetonitrile and 0.1% formic acid using a gradient program. Based on the accurate masses, fragmental MS2 ions and fragmentation pathway, we unambiguously affirmed or tentatively identified 30 compounds, including 11 phenolic acids, 10 iridoid glycosides, 8 fiavonoids and 1 saponin, from JYH and JFYH. Among them, all compounds were detected in Lonicerajaponica, but only 21 compounds were detected in JFYH. In addition, the relative contents of the 21 common chemical constituents were also different in JYH and JFYH, suggesting an obvious chemical difference between JYH and JFYH.
