174,101 research outputs found
Heiner, Daniel-Residence P.1
No full text7496 Daniel Heiner residence in North Morgan, Utah. Built in c. 1869. Heiner was Mayor of Morgan, etc. Gift of Helen Mathison. SL
Institut verabschiedet Leiter Niemann
No full textNeustadt: Er hat von Mariensee aus weltweit Kontakte geknüpft und tiefe Spuren hinterlassen: mit einem Symposium hat das Institut für Nutztiergenetik am Donnerstag seinen Leiter Heiner Niemann verabschiedet
Influence of tree internal N status on uptake and translocation of C and N in beech: a dual C-13 and N-15 labeling approach
No full textInfluence of plant internal nitrogen (N) stocks on carbon (C) and N uptake and allocation in 3-year-old beech (Fagus sylvatica L.) was studied in two N-15- and C-13-labeling experiments. In the first experiment, trees were grown in sand and received either no N nutrition (-N treatment) or 4 mM unlabeled N (+N treatment) for 1 year. The -N- and +N-pretreated trees were then supplied with 4 mM N-15 and grown in a (CO2)-C-13 atmosphere for 24 weeks. In the second experiment, trees were pretreated with 4 mM 15N for 1 year and then supplied with unlabeled N for 24 weeks and the remobilization of stored N-15 was monitored. On the whole-plant level, uptake of new C was significantly reduced in -N-pretreated trees; however, partitioning of new C was not altered, although there was a trend toward increased belowground respiration. The amount of N taken up was not influenced by N nutrition in the previous year. In +N-pretreated trees, partitioning of new N was dominated by the fine roots (59.7% at Week 12), whereas in -N-pretreated trees, partitioning of new N favored stem, coarse roots and fine roots (24, 21 and 31.9%, respectively, at Week 12), indicating the formation of N stores. The contribution of previous-year N to leaf N was about 15%. The N remobilized for leaf formation had been stored in stem and coarse roots. We conclude that, within a growing season, the growth of beech is strongly determined by the availability of tree internal N stores, whereas the current N supply is of less importance
Influence of tree internal N status on uptake and translocation of C and N in beech: a dual C-13 and N-15 labeling approach
No full textInfluence of plant internal nitrogen (N) stocks on carbon (C) and N uptake and allocation in 3-year-old beech (Fagus sylvatica L.) was studied in two N-15- and C-13-labeling experiments. In the first experiment, trees were grown in sand and received either no N nutrition (-N treatment) or 4 mM unlabeled N (+N treatment) for 1 year. The -N- and +N-pretreated trees were then supplied with 4 mM N-15 and grown in a (CO2)-C-13 atmosphere for 24 weeks. In the second experiment, trees were pretreated with 4 mM 15N for 1 year and then supplied with unlabeled N for 24 weeks and the remobilization of stored N-15 was monitored. On the whole-plant level, uptake of new C was significantly reduced in -N-pretreated trees; however, partitioning of new C was not altered, although there was a trend toward increased belowground respiration. The amount of N taken up was not influenced by N nutrition in the previous year. In +N-pretreated trees, partitioning of new N was dominated by the fine roots (59.7% at Week 12), whereas in -N-pretreated trees, partitioning of new N favored stem, coarse roots and fine roots (24, 21 and 31.9%, respectively, at Week 12), indicating the formation of N stores. The contribution of previous-year N to leaf N was about 15%. The N remobilized for leaf formation had been stored in stem and coarse roots. We conclude that, within a growing season, the growth of beech is strongly determined by the availability of tree internal N stores, whereas the current N supply is of less importance
The first metazoa living in permanently anoxic conditions
No full textAbstract Background Several unicellular organisms (prokaryotes and protozoa) can live under permanently anoxic conditions. Although a few metazoans can survive temporarily in the absence of oxygen, it is believed that multi-cellular organisms cannot spend their entire life cycle without free oxygen. Deep seas include some of the most extreme ecosystems on Earth, such as the deep hypersaline anoxic basins of the Mediterranean Sea. These are permanently anoxic systems inhabited by a huge and partly unexplored microbial biodiversity. Results During the last ten years three oceanographic expeditions were conducted to search for the presence of living fauna in the sediments of the deep anoxic hypersaline L'Atalante basin (Mediterranean Sea). We report here that the sediments of the L'Atalante basin are inhabited by three species of the animal phylum Loricifera (Spinoloricus nov. sp., Rugiloricus nov. sp. and Pliciloricus nov. sp.) new to science. Using radioactive tracers, biochemical analyses, quantitative X-ray microanalysis and infrared spectroscopy, scanning and transmission electron microscopy observations on ultra-sections, we provide evidence that these organisms are metabolically active and show specific adaptations to the extreme conditions of the deep basin, such as the lack of mitochondria, and a large number of hydrogenosome-like organelles, associated with endosymbiotic prokaryotes. Conclusions This is the first evidence of a metazoan life cycle that is spent entirely in permanently anoxic sediments. Our findings allow us also to conclude that these metazoans live under anoxic conditions through an obligate anaerobic metabolism that is similar to that demonstrated so far only for unicellular eukaryotes. The discovery of these life forms opens new perspectives for the study of metazoan life in habitats lacking molecular oxygen.</p
Recordações da revolução: Quarteto, de Heiner Müller, e a peça de aprendizagem brechtiana
No full textO artigo discute a peça Quarteto, de Heiner Müller, a partir de questões recuperadas dos debates entre Walter Benjamin e Bertolt Brecht a respeito de Franz Kafka. Segundo a hipótese do artigo, o posicionamento crítico de Müller perante Brecht, exposto no ensaio “Fatzer ± Keuner” é um elemento central para a reconfiguração de seu teatro ao longo dos anos 1970. É nesse período que surge uma peça como Quarteto, a qual é analisada aqui na perspectiva do enfrentamento crítico dos pressupostos do teatro brechtiano
Microbial use of maize cellulose and sugarcane sucrose monitored by changes in the C-13/C-12 ratio
No full textAn arable soil with organic matter formed from C3-vegetation was amended initially with maize cellulose (C-4-cellulose) and sugarcane sucrose (C-4-Sucrose) in a 67-day laboratory incubation experiment with microcosms at 25 degrees C. The amount and isotopic composition (C-13/C-12) Of Soil organic C, CO2 evolved, microbial biomass C, and microbial residue C were determined to prove whether the formation of microbial residues depends on the quality of the added C source adjusted with NH4NO3 to the same C/N ratio of 15. In a subsequent step, C-3-cellulosc (3 mg C g(-1) soil) was added without N to soil to determine whether the microbial residues formed initially from C-4-substrate are preferentially decomposed to maintain the N-demand of the soil microbial community. At the end of the experiment, 23% Of the two C-4-substrates added was left in the soil, while 3% and 4% of the added C-4-cellulose and C-4-sucrose, respectively, were found in the microbial biomass. The addition of the two C-4-substrates caused a significant 100% increase in C-3-derived CO, evolution during the 5-33 day incubation period. The addition of C-3-cellulose caused a significant 50% increase in C-4-derived CO2 evolution during the 38-67 day incubation period. The decrease in microbial biomass C-4-C accounted for roughly 60% of this increase. Cellulose addition promoted microorganisms strongly able to recycle N immediately from their own tissue by "cryptic growth" instead of incorporating NO3- from the soil solution. The differences in quality of the microbial residues produced by C-4-cellulose and C-4-Sucrose decomposing microorganisms are also reflected by the difference in the rates of CO2 evolution, but not in the rates of net N mineralization. (c) 2007 Elsevier Ltd. All rights reserved
Decision making when choices are complex: a test of Heiner\u27s hypothesis
No full textThis paper explores Heiner\u27s hypothesis concerning a gap between the cognitive ability of decision makers and the difficulty of decisions (the C-D gap). The implications of decision heuristics for coefficient estimates when uncertainty is faced by decision makers is discussed, where the level of uncertainty varies with complexity. Statistical analysis strongly supports the presence of a C-D gap and provides evidence supporting the use of decision heuristics. The results of both direct and indirect methods suggest that mixed decision strategies may be used. It is also found that complexity effects can have important implications for welfare analysis. -Author
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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