The excretion of Cryptococcus neoformans (Sanfelice) VUILLEMIN 1894 by pet birds     

J K?sters  U Kauer  H Gerlach  F Grimm 《DTW. Deutsche tier?rztliche Wochenschrift》1991,98(4):134-136

A survey on taxonomy, diagnosis, distribution and pathogenicity of Cryptococcus neoformans is given. The investigation presented here concerns 1046 fecal samples of avian species, which can be kept in the living area of humans. All together only 15 strains have been isolated, 9 of which originated from the same breeder.  相似文献   

Paraquat-induced production of hydrocarbon gases     

Beverly A. Boehler-Kohler  Günter Lpple  Volker Hellmann  Peter Bger 《Pest management science》1982,13(3):323-329

Paraquat dichloride (1,1′-dimethyI-4,4′-bipyridylium dichloride) induced the production of the hydrocarbon gases propane, ethane and ethylene in the xanthophycean microalga Bumilleriopsis filiformis. Formation of these gases was dependent on the light intensity and photosynthetic electron transport. Diquat dibromide (1,1′- ethylene-2,2′-bipyridylium dibromide), having a higher midpoint potential than paraquat dichloride, induced an even higher evolution of the gases. A total lack of oxygen inhibited the production of gas, while a low oxygen concentration (4–6% by volume) stimulated paraquat-induced gas formation. Culturing algae autotrophically, in a medium with a higher iron content, also increased the production of gases in the presence of the herbicide. Formation of these gases is an indication of the peroxidation of membrane lipids which, according to previous results, is correlated with a decrease of photosynthetic electron-transport activity.  相似文献   

Effects of Organic Fertility Management on Physicochemical Properties and Sensory Quality of Diverse Rice Cultivars     

Elaine T. Champagne  Karen L. Bett-Garber  Casey C. Grimm  Anna M. McClung 《Cereal Chemistry》2007,84(4):320-327

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Pre- and postinvasion defenses both contribute to nonhost resistance in Arabidopsis     

Lipka V  Dittgen J  Bednarek P  Bhat R  Wiermer M  Stein M  Landtag J  Brandt W  Rosahl S  Scheel D  Llorente F  Molina A  Parker J  Somerville S  Schulze-Lefert P 《Science (New York, N.Y.)》2005,310(5751):1180-1183

Nonhost resistance describes the immunity of an entire plant species against nonadapted pathogen species. We report that Arabidopsis PEN2 restricts pathogen entry of two ascomycete powdery mildew fungi that in nature colonize grass and pea species. The PEN2 glycosyl hydrolase localizes to peroxisomes and acts as a component of an inducible preinvasion resistance mechanism. Postinvasion fungal growth is blocked by a separate resistance layer requiring the EDS1-PAD4-SAG101 signaling complex, which is known to function in basal and resistance (R) gene-triggered immunity. Concurrent impairment of pre- and postinvasion resistance renders Arabidopsis a host for both nonadapted fungi.  相似文献   

Public health. Staggering toward a global strategy on alcohol abuse     

Grimm D 《Science (New York, N.Y.)》2008,320(5878):862-863

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The veiled planet     

Grimm R 《Science (New York, N.Y.)》1994,264(5166):1783

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Bose-Einstein condensation of cesium     

Weber T  Herbig J  Mark M  Nägerl HC  Grimm R 《Science (New York, N.Y.)》2003,299(5604):232-235

Bose-Einstein condensation of cesium atoms is achieved by evaporative cooling using optical trapping techniques. The ability to tune the interactions between the ultracold atoms by an external magnetic field is crucial to obtain the condensate and offers intriguing features for potential applications. We explore various regimes of condensate self-interaction (attractive, repulsive, and null interaction strength) and demonstrate properties of imploding, exploding, and non-interacting quantum matter.  相似文献   

Carbon in Amazon forests: unexpected seasonal fluxes and disturbance-induced losses   总被引：1，自引：0，他引：1  

Saleska SR  Miller SD  Matross DM  Goulden ML  Wofsy SC  da Rocha HR  de Camargo PB  Crill P  Daube BC  de Freitas HC  Hutyra L  Keller M  Kirchhoff V  Menton M  Munger JW  Pyle EH  Rice AH  Silva H 《Science (New York, N.Y.)》2003,302(5650):1554-1557

The net ecosystem exchange of carbon dioxide was measured by eddy covariance methods for 3 years in two old-growth forest sites near Santarém, Brazil. Carbon was lost in the wet season and gained in the dry season, which was opposite to the seasonal cycles of both tree growth and model predictions. The 3-year average carbon loss was 1.3 (confidence interval: 0.0 to 2.0) megagrams of carbon per hectare per year. Biometric observations confirmed the net loss but imply that it is a transient effect of recent disturbance superimposed on long-term balance. Given that episodic disturbances are characteristic of old-growth forests, it is likely that carbon sequestration is lower than has been inferred from recent eddy covariance studies at undisturbed sites.  相似文献   

Math and science education. Hong Kong, Finland students top high school test of applied skills     

Grimm D 《Science (New York, N.Y.)》2004,306(5703):1877

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Microbial reefs in the Black Sea fueled by anaerobic oxidation of methane     

Michaelis W  Seifert R  Nauhaus K  Treude T  Thiel V  Blumenberg M  Knittel K  Gieseke A  Peterknecht K  Pape T  Boetius A  Amann R  Jørgensen BB  Widdel F  Peckmann J  Pimenov NV  Gulin MB 《Science (New York, N.Y.)》2002,297(5583):1013-1015

Massive microbial mats covering up to 4-meter-high carbonate buildups prosper at methane seeps in anoxic waters of the northwestern Black Sea shelf. Strong 13C depletions indicate an incorporation of methane carbon into carbonates, bulk biomass, and specific lipids. The mats mainly consist of densely aggregated archaea (phylogenetic ANME-1 cluster) and sulfate-reducing bacteria (Desulfosarcina/Desulfococcus group). If incubated in vitro, these mats perform anaerobic oxidation of methane coupled to sulfate reduction. Obviously, anaerobic microbial consortia can generate both carbonate precipitation and substantial biomass accumulation, which has implications for our understanding of carbon cycling during earlier periods of Earth's history.  相似文献