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  • Springer  (321)
  • Blackwell Publishing Ltd  (38)
  • 2000-2004  (120)
  • 1995-1999  (213)
  • 1975-1979  (26)
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  • 1
    Digitale Medien
    Digitale Medien
    Evidence for the presence and role of tightly bound adenine nucleotides in phospholipid-free purifiedMicrococcus lysodeikticus adenosine triphosphatase (1977)
    Springer
    Journal of bioenergetics and biomembranes 9 (1977), S. 303-320 
    Details
    ISSN: 1573-6881
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Physik
    Notizen: Abstract [32P]-labeled ATPase was isolated in a highly purified state fromMicrococcus lysodeikticus strain PNB grown in medium supplemented with [32P]orthophosphate. Selective extraction procedures allowed us to determine that at least 25% of the firmly bound label belonged to adenine nucleotides, ATP and ADP being present in equimolar amounts. However, no32P label was found to be part of phospholipids. This was confirmed by purification of the ATPase from cells fed with [2—3H]glycerol. Using the luciferin-luciferase assay we estimated that ATPase freshly isolated by Sephadex chromatography (specific activity 10–14 µmole substrate transformed · min−1 · mg protein−1) contained 2 moles ATP/mole of enzyme. The ratio fell with the age of enzyme and its purification by gel electrophoresis and this was paralleled by a loss of ATPase activity. The endogenous nucleotides were readily exchanged by added ADP or ATP. This result suggests that the sites for tight binding of adenine nucleotides are equivalent, although ADP seems to have a higher affinity for them. The last properties represent a peculiar characteristic of this bacterial ATPase as compared with other bacterial and organelle energy-transducing proteins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00743217
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  • 2
    facet.materialart.
    Unbekannt
    Morphological and structural analysis in the Anaga offshore massif, Canary Islands: fractures and debris avalanches relationships (2003)
    Springer
    Details
    Publikationsdatum: 2003-03-01
    Print ISSN: 0025-3235
    Digitale ISSN: 1573-0581
    Thema: Geologie und Paläontologie , Physik
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 3
    Digitale Medien
    Digitale Medien
    Impact of pig slurry on soil properties, water salinization, nitrate leaching and crop yield in a four-year experiment in Central Spain (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 20 (2004), S. 0 
    Details
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. The repeated application of pig slurry to agricultural soils may result in an accumulation of salts and a risk of aquifer pollution due to nitrate leaching and salinization. Under Mediterranean conditions, a field experiment on a sandy loam soil (Typic Xerofluvent) was performed with maize (Zea mays) in 1998, 1999 and 2001 to study the effects of applying optimal (P1) and excessive rates (P3) of pig slurry on soil salinization, nitrate leaching and groundwater pollution. The rate of pig slurry was established considering the optimal N rate for maize in this soil (170, 162 and 176 kg N ha−1 for 1998, 1999 and 2001, respectively). Pig slurry treatments were compared to an optimal N rate supplied as urea (U) and a control treatment without N fertilizer (P0). The composition of the slurries showed great variability between years. Mean NO3− leaching losses from 1998 to 2001 were 329, 215, 173 and 78 kg N ha−1 for P3, P1, U and P0 treatments, respectively. The amount of total dissolved salts (TDS) added to the soil in slurry application between 1998 and 2001 was 2019 kg TDS ha−1 for the P1 treatment and 6058 kg TDS ha−1 for the P3 treatment. As a consequence, the electrical conductivity (EC) of the slurry-treated soils was greater than that of the control soil. The EC correlated significantly with the sodium concentration of the soil solution. Over the entire experimental period, 2653, 2202 and 2110 kg Na ha−1 entered the aquifer from the P3, P1 and P0 treatments, respectively. The P3 treatment did not significantly increase grain production in 1999 and 2001 compared with that achieved with the optimal N rate treatment (P1). This behaviour shows the importance of establishing application guidelines for pig slurry that will reduce the risk of soil and groundwater pollution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1475-2743.2004.tb00395.x
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  • 4
    Digitale Medien
    Digitale Medien
    Mitigation of N2O emissions from grassland by nitrification inhibitor and Actilith F2 applied with fertilizer and cattle slurry (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 18 (2002), S. 0 
    Details
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. Nitrous oxide (N2O) is involved in both ozone destruction and global warming. In agricultural soils it is produced by nitrification and denitrification mainly after fertilization. Nitrification inhibitors have been proposed as one of the management tools for the reduction of the potential hazards of fertilizer-derived N2O. Addition of nitrification inhibitors to fertilizers maintains soil N in ammonium form, thereby gaseous N losses by nitrification and denitrification are less likely to occur and there is increased N utilization by the sward. We present a study aimed to evaluate the effectiveness of the nitrification inhibitor dicyandiamide (DCD) and of the slurry additive Actilith F2 on N2O emissions following application of calcium ammonium nitrate or cattle slurry to a mixed clover/ryegrass sward in the Basque Country. The results indicate that large differences in N2O emission occur depending on fertilizer type and the presence or absence of a nitrification inhibitor. There is considerable scope for immediate reduction of emissions by applying DCD with calcium ammonium nitrate or cattle slurry. DCD, applied at 25 kg ha–1, reduced the amount of N lost as N2O by 60% and 42% when applied with cattle slurry and calcium ammonium nitrate, respectively. Actilith F2 did not reduce N2O emissions and it produced a long lasting mineralization of previously immobilized added N.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1475-2743.2002.tb00231.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Microsporidiosis in HIV-Positive Children in Madrid (Spain). (1997)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 44 (1997), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: A prospective study was carried out to determine the prevalence rates of microsporidiosis and other enteroparasites in HIV-positive children in the Madrid area. HIV-positive pediatric patients from three hospitals were entrolled in the study. A total of 293 samples (158 stool and 127 urine) were collected from 83 children whose mean age was 6.3 years and hed a mean CD4 count of 504.7/mm3 (range 1-2,220/mm3), 48 of whom suffered diarrhea at the time of the study. Microsporidia indentification was investigated in stool and unrine samples using Weber's chromotrope-based strain, IIF and PCR species-specific tests. Enteric parasites were identified in 32.5% of the children. Cryptosporidium sp. was the most common parasite encuntered (14.4%), followed by Blastocytis sp. (9.6%) and Giardia duodenalis (8.4%). Microsoridia was only found in the stools of one child (1.2% of total and 2% of those with diarrhea) and Enterocytozoon bieneusi was demonstrated by PCR. The patient was 10 years old, Presented non-chronic diarrhea and his CD4 count was 298/mm3. These date differ from those previously reported by us in HIV-positive adults (13.9%) in the same area, although this group showed more severely depressed CD4 lymphocyte counts than children. New epidemiological studies should be carried out to elucidate whether additional risk factors exist betwen these groups.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1997.tb05798.x
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  • 6
    Digitale Medien
    Digitale Medien
    Direct Visualization of the Microtubular Cytoskeleton of Ciliated Protozoa with a Fluorescent Taxoid (2002)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 49 (2002), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: . Visualization of the infraciliature, which is an essential tool for the identification of ciliate species, has traditionally been obtained with silver proteinate methods. Since infraciliature is mainly composed of microtubules, we used the synthetic fluorescent taxoid FLUTAX as a method for ciliate identification. The main advantages of this method are the facility and rapidity of its application and the fact that no previous fixation and permeabilization processes are required. FLUTAX may also be used as a probe to follow morphogenetical changes in the microtubular cytoskeleton during the ciliate life cycle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.2002.tb00376.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Opportunism in Capital Budget Recommendations: The Effects of Past Performance and Its Attributions (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 32 (2001), S. 0 
    Details
    ISSN: 1540-5915
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: This study uses an experiment to examine the separate and combined effects of managers' loss aversion and their causal attributions about their divisions' performance on tendencies to make goal-incongruent capital budget recommendations. We find that managers' recommendations are biased by their loss aversion. In particular, managers of high-performing divisions are more likely than managers of low-performing divisions to propose investments that maximize their division's short-term profits at the expense of the firm's long-term value. We also find that managers' recommendations are biased by their causal attributions. In particular, managers are more likely to propose investments that maximize their division's short-term profits at the expense of the firm's long-term value when they attribute their division's performance to external causes (e.g., task difficulty or luck) rather than to internal causes (e.g., managerial ability or effort). Further, the effects of causal attributions are greater for managers of high-performing divisions than for managers of low-performing divisions. The study's findings are important because loss aversion and causal attributions are often manifested in firms. Thus, they may bias managers' decisions, which in turn may be detrimental to the firms' long-term value.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1540-5915.2001.tb00968.x
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  • 8
    Digitale Medien
    Digitale Medien
    Ontogenetic changes in the diet of the herbivorous Scartichthys viridis in a rocky intertidal zone in central Chile (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 56 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Scartichthys viridis maintains a herbivorous diet following recruitment to rocky intertidal areas, where it consumes almost exclusively macroalgae. The sheet–like green macroalgae Ulva and Enteromorpha were the main items consumed by individuals 〈130 mm LT. The tough branching red macroalga Gelidium made the bulk of the gut contents of specimens 〉220 mm LT, Ulva being consumed to a much lesser extent. Further, Gelidium increased in importance in the total gut contents during ontogeny. In contrast, both small (70–120 mm LT) and medium–sized (140–210 mm LT) S. viridis individuals preferred Ulva in the laboratory. It is suggested that the increasing consumption of Gelidium along the ontogeny of S. viridis results from the limited availability of Ulva in the field. Large S. viridis individuals possessed longer guts relative to their body length, in comparison with small individuals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb00887.x
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  • 9
    Digitale Medien
    Digitale Medien
    Liquid Smoke Effects on Escherichia Coli O157:H7, and its Antioxidant Properties in Beef Products (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 63 (1998), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Experiments were performed to evaluate the antibacterial properties of liquid smoke (LS), against E. coli O157:H7, in model (agar) and meat systems. The effects of 8% LS on growth of E. coli O157:H7 attached to ground beef, and 1.5% LS on warmed-over flavor (WOF) in precooked beef patties were also studied. E. coli O157:H7 growth was reduced (p〈0.05) 2.3 log10 CFU/g in ground beef patties after 3d refrigerated storage. TBA numbers, aroma scores and pH values were lower (p〈0.05) in LS treated beef patties. LS reduced undesirable flavor development and may help assure the safety of beef products.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1998.tb15697.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    REACTIONS OF FORMED ELEMENTS OF BLOOD WITH PLASMA PROTEINS AT INTERFACES (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 283 (1977), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1977.tb41753.x
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