Physiological and molecular responses of invasive cyanobacterium Raphidiopsis raciborskii to ambient phosphorus deficiency

Raphidiopsis raciborskii can cause harmful cyanobacterial blooms when concentrations of environme ntal pho sphorus(P) are very low,thus the physiological and molecular mechanisms involved in the acclimation to P need to be characterized better.The growth,chlorophyll fluorescence,alkaline phosphatase,and expression of genes directly involved in P assimilation were compared in the R.raciborskii FACHB1496 strain grown with and without inorganic P.The specific growth rate(μ),Chl a,and six fluorescen...     

第七届国际水—岩相互作用研讨会

第七届国际水—岩作用研讨会(7th International Symposium on Water—Rock Interaction)1992年7月9～23日在美国犹他州花园城(Park City)召开。国际水—岩作用研讨会是国际地球化学、宇宙化学协会(IAGC)每三年举行一次的大型学术会议。本届研讨会是自1974年第一届以来规模最大的一次,共有35个国家的410名代表参加,其中我国代表10人。 从学术活动来看,本届大会主要讨论与国民经济和科技发展有重大作用和深远意义的有关问题,诸如“地热系统”、“沉积盆地”、“地下水环境”、“全球变化地球化学响应”等,专题总数20个。另外,会议还设立了两个纪念性专题讨论会:一个是为纪念国际著名地热—地球化学家、美国科学院院士Donald E White而设立的“大陆地热系统”;另一个是为纪念国际知名矿物—地球化学家、美国地质调查所矿产资源部主任John Hem博士而设立的“铝地球化学”。 会议的主要学术内容如下:     

Petrological and Metamorphic Evolution Study of the Staurolite-bearing Garnet Amphibolite in the Nyingchi Complex of the Lhasa Block

<正>1 Introduction Metamorphosed mafic rocks in orogenic belts usually involve high-variance assemblages which are stable very large regions of pressure(P)–temperature(T)and compositional(X)space.In particular,amphibolite facies mafic rocks typically contain similar assemblages:     

Zircon LA-ICP-MS U-Pb Dating of Listwanite from Baer Ophiolite, Yarlung- Zangbo Suture Zone, Implications for the Indus-Eurasia Collision

<正>1 Introduction Listwanite is a suite of silica-carbonate alteration products formed when CO2-bearing hydrothermal fluids meet and react with serpentinized mafic and ultramafic rocks(Robinson et al.,2005).This alteration product is of great economic significance.Gold,mercury,magnesite and base metal deposits are often associated with     

Accumulation Conditions of Shale-Gas from the Lower Cambrian Niutitang Formation in Central Guizhou Uplift and Its Periphery

<正>1 Introduction Shale gas is unconventional natural gas existed in shale in the form of absorption,detached state or others.It is typical pattern of‘self-generation and self-reservoir,situ accumulation’.Shale gas is an abundant resource in China with 25×1012m3 recoverable resource.Many sets of Cambrian and Silurian marine shales were developed in     

Discussion of the “warming and wetting” trend and its future variation in the drylands of Northwest China under global warming

Since Shi et al. proposed that the climate in the drylands of Northwest China experienced a significant transition from a “warming and drying” trend to a “warming and wetting” trend in the 1980s, researchers have conducted numerous studies on the variations in precipitation and humidity in the region and even in arid Central Asia. In particular, the process of the “warming and wetting” trend by using obtained measurement data received much attention. However, there remain uncertainties about whe...     

Cross-border Urban Networks Based on Manufacturing Global Value Chain: A Study of Listed Companies in Western China

Cross-border investment is essential for western China’s globalization. Global value chain(GVC) forms cross-border investment networks between industries in western China and overseas cities. Focusing on GVC, this study uses the social network analysis method, entropy method, multi-index comprehensive evaluation method, and quadratic assignment procedure analysis method to examine the characteristics and influencing factors of the urban networks of research and development(R&D), production, ...     

Phylogenetic relationship of Podocopida (Ostracoda:Podocopa) based on 18S ribosomal DNA sequences

1 IntroductionOstracodaisoneofthelargestgroupsoftheCrus-tacea (M artin and Davis, 2001), and the num bersofliving speciesofostracodesconsistof7 500. OneofthefrustratingaspectsforOstracodastudyisunstabili-tyofthehigherclassification status (Schram, 1986),w…