Mass mortality of krill caused by parasitoid ciliates     

Gómez-Gutiérrez J  Peterson WT  De Robertis A  Brodeur RD 《Science (New York, N.Y.)》2003,301(5631):339

  相似文献   

Ionic intermediates     

Peterson PE 《Science (New York, N.Y.)》1976,192(4242):881

  相似文献   

Emergence of anoxia in the California current large marine ecosystem     

Chan F  Barth JA  Lubchenco J  Kirincich A  Weeks H  Peterson WT  Menge BA 《Science (New York, N.Y.)》2008,319(5865):920

Eastern boundary current systems are among the world's most productive large marine ecosystems. Because upwelling currents transport nutrient-rich but oxygen-depleted water onto shallow seas, large expanses of productive continental shelves can be vulnerable to the risk of extreme low-oxygen events. Here, we report the novel rise of water-column shelf anoxia in the northern California Current system, a large marine ecosystem with no previous record of such extreme oxygen deficits. The expansion of anoxia highlights the potential for rapid and discontinuous ecosystem change in productive coastal systems that sustain a major portion of the world's fisheries.  相似文献   

Azotobacter cysts: reactivation by white light after inactivation by ultraviolet radiation     

G R Vela  J W Peterson 《Science (New York, N.Y.)》1969,166(910):1296-1297

Cysts of Azotobacter vinelandii 12837 inactivated by ultraviolet radiation can be reactivated by white light. This photoreactivation mechanism is not seen in the vegetative cells of the same organism.  相似文献   

Bends: detection of circulating gas emboli with external sensor     

M F Gillis  M T Karagianes  P L Peterson 《Science (New York, N.Y.)》1968,161(841):579-580

Circulating gas emboli associated with rapid decompression are detectable in superficial vessels of animals by the use of an ultrasonic Doppler flowmeter transducer which is applied externally.  相似文献   

Wolves, moose, and the allometry of population cycles     

Peterson RO  Page RE  Dodge KM 《Science (New York, N.Y.)》1984,224(4655):1350-1352

After a decade of dramatic population fluctuations, protected populations of wolves and moose in Isle Royale National Park in Lake Superior returned in 1983 to the levels observed in the 1950's. Inherent lags in this predator-prey system and the strong recovery of the moose population following a wolf population crash suggest that these populations may continue to cycle with a period length of about 38 (95 percent confidence interval, +/-13) years. Such a long-term cycle is consistent with the proposal that period length of herbivore population cycles will characteristically scale according to the fourth root of body mass, a basic allometric relation linking physiological cycles to population processes.  相似文献   

Cell size and rate of protein synthesis in ventral horn neurones     

R P Peterson 《Science (New York, N.Y.)》1966,153(742):1413-1414

Autoradiographic studies show that small ventral horn neurones synthesize protein at a greater rate per unit area of cytoplasm than do large ones. It is suggested that this is related to the faster rate of firing of the smaller neurones.  相似文献   

Book reviews     

Christopher Vecsey  Lawrence Busch  Robert E. Mazur  S. 'Tunji Titilola  Joel Schor  Don F. Hadwiger  E. Wesley F. Peterson  Lorraine Garkovich  Scott R. Collard  Tony Smith 《Agriculture and Human Values》1990,7(3-4):107-131

  相似文献   

Increasing river discharge to the Arctic Ocean   总被引：10，自引：0，他引：10  

Peterson BJ  Holmes RM  McClelland JW  Vörösmarty CJ  Lammers RB  Shiklomanov AI  Shiklomanov IA  Rahmstorf S 《Science (New York, N.Y.)》2002,298(5601):2171-2173

Synthesis of river-monitoring data reveals that the average annual discharge of fresh water from the six largest Eurasian rivers to the Arctic Ocean increased by 7% from 1936 to 1999. The average annual rate of increase was 2.0 +/- 0.7 cubic kilometers per year. Consequently, average annual discharge from the six rivers is now about 128 cubic kilometers per year greater than it was when routine measurements of discharge began. Discharge was correlated with changes in both the North Atlantic Oscillation and global mean surface air temperature. The observed large-scale change in freshwater flux has potentially important implications for ocean circulation and climate.  相似文献   

Another look at MgB2 and YBCO wires     

Hawsey RA  Peterson DE 《Science (New York, N.Y.)》2002,296(5568):655

  相似文献