To determine light requirement and adaptability of Fraxinus mandshurica seedlings, the seasonal variations of photosynthetic variables were measured in 3-year-old seedlings grown under four light levels （100%, 60%, 3...To determine light requirement and adaptability of Fraxinus mandshurica seedlings, the seasonal variations of photosynthetic variables were measured in 3-year-old seedlings grown under four light levels （100%, 60%, 30%, and 15% of full sunlight） with a LI-6400 portable photosynthesis system. The leaf chlorophyll content, special leaf weight, annual height and basal diameter increment of seedlings were also observed. The maximum and minimum values of net photosynthetic rate, maximum rate of carboxylation, and maximum rate of electron transport of F. mandshurica seedlings were detected with 60% and 15% of full sunlight treatments, respectively. With the decrease of light level, both light saturation point and special leaf weight significantly declined （p 0.05）, but leaf chlorophyll content significantly increased （p 0.05）. Annual height and basal diameter increments of seedlings grown under 60% of full sunlight treatment were significantly greater than those of seedlings under other treatments （p 0.05）. It was concluded that F. mandshurica seedlings can adapt to a wide range of light environments from 15% to 100% of full sunlight by adjusting light saturation point, leaf chlorophyll content and special leaf weight. According to the maximum of relative growth, 60% of full sunlight treatment is the optimum light level for the growth of 3-year-old F. mandshurica seedlings.展开更多
On the basis of photogravitational theory,the influence of solar photogravitation on the motion of comet Hale-Bopp is discussed.It is shown that for plasma tail of comet Hale-Bopp there is only one collinear point L_(...On the basis of photogravitational theory,the influence of solar photogravitation on the motion of comet Hale-Bopp is discussed.It is shown that for plasma tail of comet Hale-Bopp there is only one collinear point L_(3) and for a few of dust tail there can be two coplanar points L_(6),L_(7) and three collinear points L_(21),L_(22),L_(3).The regions in which the coplanar points exist and the dust grain of comet Hale-Bopp can move are also obtained.展开更多
Using the Jeans problem and the Fermi problem of two bodies with variable masses,the influence of solar and cometary mass-loss on the orbit of comet Shoemaker-Levy 9(SL9)is discussed in this paper.It is shown that sol...Using the Jeans problem and the Fermi problem of two bodies with variable masses,the influence of solar and cometary mass-loss on the orbit of comet Shoemaker-Levy 9(SL9)is discussed in this paper.It is shown that solar and cometary mass-loss both will cause the secular and periodic terms in the semimajor axis a of comet SL9.The influence of solar mass-loss on the orbit of comet SL9 is very small and it may be omitted.But the influence of mass-loss of comet SL9 itself on its orbit is large and it may cause the secular variation in a to be about l04 km every year.The cometary mass-loss will obviously influence the time and place of the comet SL9 crashing into Jupiter.展开更多
Objective: To observe the clinical efficacy of deep acupuncture mainly at Huantiao (GB 30) for patients with chronic prostatitis. Methods: Forty-two cases of patients with chronic prostatitis were treated with deep ac...Objective: To observe the clinical efficacy of deep acupuncture mainly at Huantiao (GB 30) for patients with chronic prostatitis. Methods: Forty-two cases of patients with chronic prostatitis were treated with deep acupuncture at Huantiao (GB 30) combined with adjunct acupoints on the base of syndrome differentiation. Ten times treatment was a course, and effects were evaluated after two courses. Results: Among all the 42 cases, 29 cases were cured, 9 cases were improved and 4 cases were invalid, and the total effective rate was 90.5%. Conclusion: It has good effect of deep acupuncture at Huantiao (GB 30) as major acupoint combined with adjunct acupoints on the base of syndrome differentiation for patients with chronic prostatitis.展开更多
基金supported by National Nature Science Foundation of China (30830085)
文摘To determine light requirement and adaptability of Fraxinus mandshurica seedlings, the seasonal variations of photosynthetic variables were measured in 3-year-old seedlings grown under four light levels （100%, 60%, 30%, and 15% of full sunlight） with a LI-6400 portable photosynthesis system. The leaf chlorophyll content, special leaf weight, annual height and basal diameter increment of seedlings were also observed. The maximum and minimum values of net photosynthetic rate, maximum rate of carboxylation, and maximum rate of electron transport of F. mandshurica seedlings were detected with 60% and 15% of full sunlight treatments, respectively. With the decrease of light level, both light saturation point and special leaf weight significantly declined （p 0.05）, but leaf chlorophyll content significantly increased （p 0.05）. Annual height and basal diameter increments of seedlings grown under 60% of full sunlight treatment were significantly greater than those of seedlings under other treatments （p 0.05）. It was concluded that F. mandshurica seedlings can adapt to a wide range of light environments from 15% to 100% of full sunlight by adjusting light saturation point, leaf chlorophyll content and special leaf weight. According to the maximum of relative growth, 60% of full sunlight treatment is the optimum light level for the growth of 3-year-old F. mandshurica seedlings.
基金Supported by the National Natural Science Foundation of China under Grant No.19633010Jiangsu Natural Science Foundation。
文摘On the basis of photogravitational theory,the influence of solar photogravitation on the motion of comet Hale-Bopp is discussed.It is shown that for plasma tail of comet Hale-Bopp there is only one collinear point L_(3) and for a few of dust tail there can be two coplanar points L_(6),L_(7) and three collinear points L_(21),L_(22),L_(3).The regions in which the coplanar points exist and the dust grain of comet Hale-Bopp can move are also obtained.
文摘Using the Jeans problem and the Fermi problem of two bodies with variable masses,the influence of solar and cometary mass-loss on the orbit of comet Shoemaker-Levy 9(SL9)is discussed in this paper.It is shown that solar and cometary mass-loss both will cause the secular and periodic terms in the semimajor axis a of comet SL9.The influence of solar mass-loss on the orbit of comet SL9 is very small and it may be omitted.But the influence of mass-loss of comet SL9 itself on its orbit is large and it may cause the secular variation in a to be about l04 km every year.The cometary mass-loss will obviously influence the time and place of the comet SL9 crashing into Jupiter.
基金supported by National Natural Science Foundation of China (81060304)
文摘Objective: To observe the clinical efficacy of deep acupuncture mainly at Huantiao (GB 30) for patients with chronic prostatitis. Methods: Forty-two cases of patients with chronic prostatitis were treated with deep acupuncture at Huantiao (GB 30) combined with adjunct acupoints on the base of syndrome differentiation. Ten times treatment was a course, and effects were evaluated after two courses. Results: Among all the 42 cases, 29 cases were cured, 9 cases were improved and 4 cases were invalid, and the total effective rate was 90.5%. Conclusion: It has good effect of deep acupuncture at Huantiao (GB 30) as major acupoint combined with adjunct acupoints on the base of syndrome differentiation for patients with chronic prostatitis.
