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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 241 (1973), S. 59-60 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Histogram showing percentage six-monthly change in metacarpal mineral content in 55 post-menopausal women. Fifty-five post-menopausal women attending a clinic because of skeletal pain were examined. We measured metacarpal mineral content at six monthly intervals for up to two years, using a ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 910-912 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Signals from one of the rapidly pulsating radio sources have been recorded on three frequencies using the mark I radio telescope at the Nuffield Radio Astronomy Laboratories. The size of the source, deduced from the form of the signals, again seems consistent with an origin in a white dwarf or ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 917-918 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Demonstration of a relationship between the flux densities and red-shifts of quasars suggests that the red-shifts give an indication of their ...
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 10 (1972), S. 23-30 
    ISSN: 1432-0827
    Keywords: Bone ; Microradiography ; Autoradiography ; Preparation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé La préparation de coupes fines, plano-parallèles d'os non décalcifié, d'épaisseur connue, pour la réalisation de microradiographies et d'autoradiographies quantitatives est décrite. Pour éviter que des fractures de l'os se produisent, le fragment osseux fixé doit être inclus dans un matériel approprié qui ne doit pas se rétracter. Un minimum de force doit être appliqué à l'échantillon pendant la coupe pour éviter des vibrations. La méthode décrite, utilisant une scie circulaire tournant à faible vitesse, est adéquate. Le polissage final des surfaces du specimen est réalisé sur une machine à polir modifiée. On peut préparer un grand nombre de coupes en relativement peu de temps pour des études statistiques.
    Abstract: Zusammenfassung Die Herstellung von dünnen, parallelgestellten Schnitten von unentkalktem Knochen bekannter Dicke zur quantitativen Auto- und Mikroradiographie wird beschrieben. Der Knochen hat die Tendenz, unter Druck zu brechen. Um diese Schwierigkeit zu überwinden, ist es sehr wichtig, daß die fixierte Knochenprobe genügend vom Einbettungsmaterial durchdrungen wird und daß das Einschlußmittel sich vom Knochenrand weg kontrahiert. Beim Schneiden darf nur ein minimaler Druck auf die Probe ausgeübt werden, damit der Knochen nicht zertrümmert wird. Die beschriebene Methode, bei welcher eine spezielle Einrichtung zum Auftropfen des Schmiermittels den Gebrauch einer langsam rotierenden Kreissäge ermöglichte, erwies sich als günstig. Das schließliche Polieren der Oberflächen der Proben wurde auf einer modifizierten Schleifmaschine ausgeführt. Mit dieser Methode kann eine große Anzahl von Schnitten in relativ kurzer Zeit hergestellt werden; dies ist sehr wichtig, um eine angemessene Anzahl von Proben für statistische Analysen zu erhalten.
    Notes: Abstract The preparation of thin, parallel-sided sections of undecalcified bone of known thickness for quantitative auto- and micro-radiography is described. To overcome the tendency of the bone to fracture when stressed, it is essential that the fixed sample of bone should be adequately penetrated by the embedding material and that the mounting material should not contract away from the edge of the bone. Minimum stress must be applied to the sample when cutting or the bone may be shattered. The method described, using a gravity feed to a low speed circular saw, has been found to be suitable. Final polishing of the surfaces of the specimen was carried out on a modified lapping machine. Large numbers of sections can be prepared in a relatively short time by the method and this is essential to obtain an adequate number of samples for statistical analysis.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 9 (1990), S. 355-357 
    ISSN: 1572-9591
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Techniques have been established to prepare palladium specimens for cold fusion experiments using an ultra-high-vacuum, allmetal, high-temperature furnace to melt palladium metal in high purity alumina molds having a test tube shape. To date 6-mm and 15-mm cylinders have been fabricated, the latter being used to fabricate a sphere 12.5-mm in diameter. Techniques and facilities used for palladium-hydrogen isotope pressure-volume-temperature measurements1–4 have been used to anneal these palladium specimens after machining and, in some cases, to charge these specimens with deuterium to PdD0.63 stoichiometry prior to their use in electrochemical cells. The modeling of palladium-hydrogen isotope pressure-composition-temperature curves is described wherein existing data5,6 is used to derive models that accurately describe the existing data and that extrapolate to high compositions. Experiments for reacting6LiD with Pd rods at 700°C to 800°C, in an attempt to precharge6Li into the Pd rods, are being prepared.
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 1035-1036 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observations were made with the Mark 2 telescope at 2,695 MHz on May 8, 9 and 10, 1968. The receiver bandwidth was 8 MHz, the system temperature 170 K and the aperture efficiency 50 per cent. The observing technique, using superposition of the receiver output over a number of cycles of the ...
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 50 (1994), S. 843-845 
    ISSN: 1420-9071
    Keywords: Staurosporine aglycone ; K252-c ; arcyriaflavin A ; ascidian ; Eudistoma ; protein kinase C ; cytotoxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Staurosporine aglycone (K252-c) (compound1) and arcyriaflavin A (2) were isolated from a specimen of the marine ascidian,Eudistoma sp., collected off the coast of West Africa. In addition to expressing micromolar and submicromolar inhibition of enzyme activity against seven protein kinase C isoenzymes and inhibition of proliferation of the human lung cancer A549 and P388 murine leukemia cell lines,1 also inhibited cell adhesion of the EL-4.IL-2 cell line and expressed activity in the K562 bleb and neutrophil assays.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Planta 165 (1985), S. 37-42 
    ISSN: 1432-2048
    Keywords: Chlorophyll fluorescence ; Chloroplast membrane ; Photoinhibition of photosynthesis ; Photosynthesis (photoinhibition) ; Pisum (photosynthesis) ; Protein phosphorylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thylakoids isolated from peas (Pisum sativum cv. Kelvedon Wonder) and phosphorylated by incubation with ATP have been compared with non-phosphorylated thylakoids in their sensitivity to photoinhibition by exposure to illumination in vitro. Assays of the kinetics of fluorescence induction at 20° C and the fluorescence emission spectra at-196° C indicate a proportionally larger decrease in fluorescence as a result of photoinhibitory treatment of non-phosphorylated compared with phosphorylated thylakoids. It is concluded that protein phosphorylation can afford partial protection to thylakoids exposed to photoinhibitory conditions.
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  • 9
    ISSN: 1432-2048
    Keywords: Chlorophyll protein complex ; Photosystem I, II ; Pisum (thylakoid) ; Protein kinase ; Thylakoid fractionation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in topography and function of pea (Pisum sativum L.) thylakoid membrane fractions following membrane protein phosphorylation have been studied. After protein phosphorylation the stromal membrane fraction had a higher chlorophyll a/b ratio, an increased content of light-harvesting chlorophyll protein and a higher ratio of chlorophyll to cytochrome f. This indicates that a pool of light-harvesting chlorophyll protein migrates from the photosystem II-enriched grana regions to the photosystem I-enriched stroma lamellae, in agreement with Kyle et al. (1984, Biochim. Biophys. Acta 765, 89–96) and Larsson et al. (1983, Eur. J. Biochem. 136, 25–29). Phosphorylation caused a stimulation in the rate of light-limited photosystem-I electron transfer in the unappressed membrane fraction, indicating that the translocated LHC-II becomes functionally associated with photosystem I.
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  • 10
    ISSN: 1432-2048
    Keywords: Chlorophyll-a/b-binding protein complex ; Nitrogen assimilation ; Phosphoenolpyruvate carboxylase ; Photosynthesis ; Sucrose phosphate synthase ; Zea (photosynthesis)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Maize (Zea mays L. cv. Contessa) was grown with a nitrogen supply that was just sufficient to support maximal biomass production. The third leaves from 14-to 21-d-old plants were harvested and net photosynthesis allowed to attain steady-state rates at an irradiance of either 250 or 700 μmol·m−2·s−1. Nitrogen in the form of either KNO3, KNO2 or NH4Cl was then supplied to the leaves through the transpiration stream. In all cases the addition of the nitrogen source resulted in an approximate doubling of the total amino-acid content of the leaves within 1 h. The glutamine pool increased to ten times the level found in control leaves in the light in the absence of added nitrogen. Glutamine accounted for about 21–24% of the total amino-acid content in leaves fed with 40 mM NH4Cl. Nitrate caused a rapid, but transient inhibition of the rate of net CO2 assimilation, accompanied by an increase in the activity of phosphoenolpyruvate carboxylase and a decrease in the maximum extractable activity of sucrose-phosphate synthase. This demonstrates that the activities of phospho-enolpyruvate carboxylase and sucrose-phosphate synthase are modulated by NO 3 − in the C4 plant maize, in a similar manner to that observed in C3 plants. Nitrite or ammonium feeding resulted in decreased rates of CO2 assimilation for as long as the nitrogen source was supplied. In all cases the degree of inhibition was greatest at high irradiance and least at low irradiance, even though the total amino-acid contents of the leaves were comparable at the time when maximum inhibition of CO2 assimilation occurred. Measurements of chlorophyll-a fluorescence showed that the quantum efficiency of PSII decreased and non-radiative dissipation of excitation energy increased as CO2 assimilation was inhibited by nitrate or nitrite. These metabolites had no direct effect on thylakoid PSII-based electron transport. Ammonium ions weakly inhibited O2 evolution at high concentrations. The addition of nitrogen (KNO 3 − , KNO2 or NH4Cl) caused a significant decrease in the phosphorylation state of the light-harvesting chlorophyll-a/b-binding protein of the thylakoid membranes. We conclude that the response of photosynthetic carbon assimilation and electron transport in maize is essentially similar whether nitrogen is supplied in the form of nitrate, nitrite or ammonium, with the noteworthy exception that the nitrogen-induced inhibition of photosynthesis is transient when leaves are supplied with NO 3 − but sustained when NO 2 − or NH 4 + is provided. We suggest that the observed modulation of phosphoenolpyruvate carboxylase and sucrose-phosphate synthase is mediated by the increase in the endogenous level of glutamine. Furthermore, the transient nature of the inhibition of CO2 assimilation in the case of NO 3 − , but not NO 2 − or NH 4 + , may be due to regulation of nitrate reductase.
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