UBVVI Surface Photometry of the Spiral Galaxy NGC 300 in the Sculptor Group

We present UBVI surface photometry over a 20.5' × 20.5' area of the late-type spiral galaxy NGC 300. We have derived isophotal maps, surface brightness profiles, ellipticity profiles, position angle profiles, and color profiles. By merging our I-band measurements with those of Boker et al. based on Hubble Space Telescope observations, we have obtained combined I-band surface brightness profiles for the region 0.02" < r < 500" and have decomposed the profiles into three components: a nucleus, a bulge, and an exponential disk.     

A STUDY ON THE WATER RESOURCES AND SEDIMENT PROBLEMS IN THE IRRIGATED AREA OF NORTHWEST SHANDONG PROVINCE

Ｉ.Ｂａｃｋｇｒｏｕｎｄ1.ＮａｔｕｒａｌｃｏｎｄｉｔｉｏｎｓＴｈｅｉｒｒｉｇａｔｅｄａｒｅａｏｆｎｏｒｔｈｗｅｓｔＳｈａｎｄｏｎｇＰｒｏｖｉｎｃｅｂｙｃｈａｎｎｅｌｉｎｇＹｅｌｌｏｗＲｉｖｅｒｉｓａｖｅｒｙｉｍｐｏｒｔａｎｔｉｒｒｉｇａｔｅｄｒｅｇｉｏｎｉｎｔｈｅｌｏｗｅｒｒｅａｃｈｅｓｏｆＹｅｌｌｏｗＲｉｖｅｒ,ｉｎｃｌｕｄｉｎｇ27ｃｏｕｎｔｉｅｓａｎｄｃｉｔｉｅｓｗｉｔｈａｎａｒｅａｏｆ29,700ｋｍ2,ｏｒ19.3ｐｅｒｃｅｎｔｏｆｔｈｅｔｏｔａｌｏｆＳｈａｎｄｏｎｇＰｒｏｖｉｎｃｅ.Ａｍｏｎｇｗｈｉ…     

贝叶斯方法在洪水保险费调整中的应用

在洪水保险中,获得的样本信息不符合对统计样本的理论要求.因此,本文运用贝叶斯统计方法,依据先验信息数据确定的保险费,结合新的理赔记录,调整和校正赔款频率和平均赔款额,从而正确估计保险费.使其符合实际的风险水平.并运用实例分析了贝叶斯方法的可行性,本文的方法和结论可供开展洪水保险项目研究和业务工作参考.     

Rapid,sensitive detection of Vibrio anguillarum using loop-mediated isothermal amplification

Vibrio anguillarum is an important bacterial pathogen of aquatic organisms and a significant problem in aquatic farming.The rapid detection and identification of V.anguillarum,and other pathogens that infect marine organisms,is crucial to effective disease management.In this study,we developed a loop-mediated amplification (LAMP) assay to detect V.anguillarum in an hour in a single tube without the need for thermal cycling.Conserved regions of the metalloproteinase (empA) gene of V.anguillarum served as the targets for primer design.A fragment of the empA gene was amplified at 65°C in the presence of the primer mixture and Bst DNA polymerase.In the optimized LAMP assay,6.7 pg of V.anguillarum DNA could be detected.Six strains of V.anguillarum and 17 strains of non-V.anguillarum bacteria were used in this study to evaluate the species specificity of the primers.The six V.anguillarum strains gave a positive result in the LAMP assay.This method was also validated in V.anguillarum-infected fish.This LAMP method is more sensitive than PCR in the detection of V.anguillarum and shows good species specificity.The LAMP assay is therefore an effective method for the quick detection of V.anguillarum both in the laboratory and in the field.     

HUMAN IMPACT ON SOIL EROSION AND SEDIMENT YIELD IN NORTHERN SHAANXI, CHINA

ｏｒｔｈｅｒｎＳｈａａｎｘｉｉｓｏｎｅｏｆｔｈｅｒｅｇｉｏｎｓｅｘｐｅｒｉｅｎｃｉｎｇｍｏｓｔｓｅｒｉｏｕｓｓｏｉｌｅｒｏｓｉｏｎｉｎＣｈｉｎａ.Ｓｕｂｓｔａｎｔｉａｌｒｅｓｅａｒｃｈｅｓｉｎｄｉｃａｔｅｄｔｈａｔｉｎａｄｄｉｔｉｏｎｔｏｐｈｙｓｉｃａｌｆａｃｔｏｒｓｔｈａｔｐｌａｙａｄｅｃｉｓｉｖｅｒｏｌｅｉｎｉｎｄｕｃｉｎｇｓｏｉｌｅｒｏｓｉｏｎ,ｈｕｍａｎｆａｃｔｏｒｓｔｈａｔａｃｃｅｌｅｒａｔｅｅｒｏｓｉｏｎｐｒｏｃｅｓｓｃａｎｎｏｔｂｅｉｇｎｏｒｅｄｅｉｔｈｅｒ[1,2,4].ＮｏｒｔｈｅｒｎＳ…     

ECOLOGICAL LANDSCAPE EFFECTS OF WINDBREAK SYSTEMS IN DESERT ZONE OF WESTERN CHINA

ＴｈｅｍｏｓｔｐｒｏｍｉｎｅｎｔｓｉｇｎｏｆｌａｎｄｓｃａｐｅｉｎｉｒｒｉｇａｔｉｏｎｏａｓｅｓａｎｄｎａｔｕｒａｌｏａｓｅｓｏｎｒｉｖｅｒｂａｎｋｓａｎｄａｌｌｕｖｉａｌｆａｎｓｉｎｄｅｓｅｒｔｚｏｎｅｏｆｗｅｓｔｅｒｎＣｈｉｎａｉｓｔｈｅｌｕｓｈｃｕｌｔｉｖａｔｅｄｏｒｎａｔｕｒａｌｗｏｏｄｓｉｎｖｉｖｉｄｌｙｇｒｅｅｎｃｏｌｏｒ,ｗｈｉｃｈｉｓｉｎｒｅｍａｒｋａｂｌｅｃｏｎｔｒａｓｔｗｉｔｈｙｅｌｌｏｗｏｒｇｒａｙｃｏｌｏｒｉｎｏｔｈｅｒｄｅｓｅｒｔｚｏｎｅｓ.Ｂｅｓｉｄｅｓｓｈｏｗｉｎｇｔ…     

FOOD SECURITY OF CHINA AND LESTER BROWN''S POINT OF VIEW

Ｉ.ＴｈｅＰｏｓｉｔｉｖｅＲｏｌｅｏｆＢｒｏｗｎ’ｓＡｒｔｉｃｌｅＡｓａｆｏｒｅｉｇｎｓｃｈｏｌａｒ,Ｍｒ.Ｌ.Ｂｒｏｗｎｈａｓｋｎｏｗｎａｓｅｒｉｅｓｏｆｄａｔａａｎｄｍａｔｅｒｉａｌｓｏｎｐｏｐｕｌａｔｉｏｎ,ｆｏｏｄｐｒｏｄｕｃｔｉｖｉｔｙａｎｄｒｅｌｅｖａｎｔｆａｃｔｏｒｓｏｆＣｈｉｎａ,ｈａｄｍａｄｅｒａｔｈｅｒｄｅｅｐａｎａｌｙｓｉｓａｎｄｇｉｖｅｎａｆｏｒｅｃａｓｔｏｆｆｏｏｄｓｅｃｕｒｉｔｙｏｆＣｈｉｎａ.Ｈｅｈａｓｓｈｏｗｎｔｈｅｐｏｓｓｉｂｌｅｓｅｒｉｏｕｓｓｅｑｕｅｎｃｅｉｎｆｏ…     

DISTRIBUTION PATTERNS OF LEAF AREA INDEX FOR MAJOR CONIFEROUS FOREST TYPES IN CHINA

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＬｅａｆａｒｅａｉｎｄｅｘ(ＬＡＩ),ｔｈｅｐｈｏｔｏｓｙｎｔｈｅｔｉｃｌｅａｆａｒｅａｒｅｌａｔｉｖｅｔｏｐｒｏｊｅｃｔｅｄｇｒｏｕｎｄａｒｅａｆｏｒａｐｌａｎｔｃｏｍｍｕｎｉｔｙ,ｉｓｃｌｏｓｅｌｙｒｅｌａｔｅｄｔｏｔｈｅｐｈｏｔｏｓｙｎｔｈｅｓｉｓｏｆｐｌａｎｔｃｏｍｍｕｎｉｔｙａｎｄｉｔｓｎｅｔｐｒｉｍａｒｙｐｒｏｄｕｃｔｉｖｉｔｙ(ＮＰＰ),ｗｈｉｃｈｉｓｐａｉｄｇｒｅａｔａｔｔｅｎｔｉｏｎｉｎｔｈｅｒｅｃｅｎｔｇｌｏｂａｌｃｈａｎｇｅｍｏｄｅｌｉｎｇ.Ｗｏｏｄｗａ…     

THE SIMULATED EXPERIMENT OF THE SMALL GRANITE BLOCKS UNDER THE COLD DRY CONDITION

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＷｅａｔｈｅｒｉｎｇｂｅｈａｖｉｏｕｒｏｆｒｏｃｋｍｕｓｔｂｅｖｉｅｗｅｄａｓｂｅｉｎｇｔｈｅｒｅｓｕｌｔｏｆｉｎｔｅｒａｃｔｉｏｎｂｅｔｗｅｅｎｔｈｅｉｎｔｒｉｎｓｉｃｐｒｏｐｅｒｔｉｅｓａｎｄｅｘｔｅｒｎａｌｃｌｉｍａｔｉｃｃｏｎｄｉｔｉｏｎｓ[45].Ｍｏｓｔｒｅｆｅｒｅｎｃｅｓｔｏｆｒｏｓｔｓｈａｔｔｅｒｉｎｇｈａｖｅｅｍｐｈａｓｉｓｅｄｔｈｅｄｉｓｒｕｐｔｉｖｅｆｏｒｃｅｓａｓｓｏｃｉａｔｅｄｗｉｔｈｔｈｅｐｈａｓｅｃｈａｎｇｅｓｏｆｗａｔｅｒｔｏｉｃｅ[1,26,34,3…