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  • 1
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    Charcoal records of two sediment cores off SW Africa (2012)
    PANGAEA
    In:  Supplement to: Daniau, Anne-Laure; Bartlein, Patrick J; Harrison, S P; Prentice, Iain Colin; Brewer, Simon; Friedlingstein, Pierre; Harrison-Prentice, T I; Inoue, J; Izumi, K; Marlon, Jennifer R; Mooney, Scott D; Power, Mitchell J; Stevenson, J; Tinner, Willy; Andric, M; Atanassova, J; Behling, Hermann; Black, M; Blarquez, O; Brown, K J; Carcaillet, C; Colhoun, Eric A; Colombaroli, Daniele; Davis, Basil A S; D'Costa, D; Dodson, John; Dupont, Lydie M; Eshetu, Z; Gavin, D G; Genries, A; Haberle, Simon G; Hallett, D J; Hope, Geoffrey; Horn, S P; Kassa, T G; Katamura, F; Kennedy, L M; Kershaw, A Peter; Krivonogov, S; Long, C; Magri, Donatella; Marinova, E; McKenzie, G Merna; Moreno, P I; Moss, Patrick T; Neumann, F H; Norstrom, E; Paitre, C; Rius, D; Roberts, Neil; Robinson, G S; Sasaki, N; Scott, Louis; Takahara, H; Terwilliger, V; Thevenon, Florian; Turner, R; Valsecchi, V G; Vannière, Boris; Walsh, M; Williams, N; Zhang, Yancheng (2012): Predictability of biomass burning in response to climate changes. Global Biogeochemical Cycles, 26(4), https://doi.org/10.1029/2011GB004249
    Details
    Publication Date: 2024-01-13
    Description: We analyze sedimentary charcoal records to show that the changes in fire regime over the past 21,000 yrs are predictable from changes in regional climates. Analyses of paleo- fire data show that fire increases monotonically with changes in temperature and peaks at intermediate moisture levels, and that temperature is quantitatively the most important driver of changes in biomass burning over the past 21,000 yrs. Given that a similar relationship between climate drivers and fire emerges from analyses of the interannual variability in biomass burning shown by remote-sensing observations of month-by-month burnt area between 1996 and 2008, our results signal a serious cause for concern in the face of continuing global warming.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Interaction of induced and uninduced cells during primary induction (1976)
    Springer
    Development genes and evolution 179 (1976), S. 237-241 
    Details
    ISSN: 1432-041X
    Keywords: primary induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary UsingTriturus pyrrhogaster embryos, the effects of uninduced cells on the differentiation of induced cells were investigated. The inducing stimulus was given to the presumptive ectoderm of early gastrulae by treatment with protein sooution from guinea pig bone-marrow. Mesodermal induction was evoked in the ectodermal explants. After the treatment, some of the ectodermal explants were cut into pieces 1/8 of their original size and combined with untreated presumptive ectoderm. Mesodermal tissues were differentiated in the combined explants too, but the mesodermal tissues evoked in these combined ectodermal explants were different in their regional characters from these in uncombined explants; dorsal structures, such as notochrod and muscle, were observed predominatly in the latter, whereas the dominant structures observed in the former were ventral ones, such as mesothelium and mesenchyme. The shifting of the regional characters in the combined explants was regarded as the result of an unknown effect from the uninduced cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848648
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  • 3
    Electronic Resource
    Electronic Resource
    High-density lipoprotein and apolipoprotein A-I deficiency induced by combination therapy with probucol and bezafibrate (1995)
    Springer
    European journal of clinical pharmacology 48 (1995), S. 209-215 
    Details
    ISSN: 1432-1041
    Keywords: Bezafibrate ; Hypercholesterolaemia ; Probucol ; apolipoproteins ; lipids ; lipoproteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract The effects of the administration of slow-release bezafibrate to hypercholesterolaemic patients who were already receiving long-term probucol treatment (mean 865 days, 500–1000 mg·day−1) were investigated. Bezafibrate was administered at either 200 mg·day−1 (13 males, 13 females, mean age 55.2 years) or 400 mg·day−1 (11 males, 14 females, mean age 57.2 years), and blood was taken at 0, 3, 6 and 12 months after the beginning of combination therapy. Overall, serum total cholesterol (TC), triglyceride (TG), very low density lipoprotein (VLDL)-TC, high-density lipoprotein (HDL)-TG, VLDL-TG, VLDL-phospholipid (PL), lipoprotein (a) [Lp(a)], apolipoprotein (apo) C-III, apo E levels and LCAT activity decreased significantly with this combination therapy, while HDL cholesterol (C), HDL3-C, HDL-PL, apo A-I and apo A-II levels significantly increased, as assessed by analysis of variance (ANOVA). Five patients (one receiving 200 mg·day−1, four receiving 400 mg·day−1 bezafibrate) showed drastic reductions in HDL-C (HDL-C levels were reduced by a mean of 46.2%, 59.3% and 61.6% at 3, 6 and 12 months, respectively) after beginning combination therapy. These HDL-C reductions were maintained for the 1 year of combination therapy, but then returned to pre-combination treatment levels 1 month after discontinuation of bezafibrate. Serum probucol concentrations and cholesteryl ester transfer protein (CETP) mass were assayed at 6 months, and the probucol concentration was higher in the HDL-deficient group (56.2 vs 26.5 μg/ml). In contrast, CETP mass was significantly lower in HDL-deficient patients than in non-HDL-deficient patients (2.08 vs 2.87 mg·l−1). When the patients in the non-HDL-deficient group were divided into two groups, receiving low (200 mg·day−1, n−25) and high (400 mg·day−1, n−21) doses of bezafibrate, the former group showed a significant increase in probucol-lowered HDL-C and apo A-I, although these levels did not return to pre-probucol treatment levels, while the latter group showed no changes in HDL. These data suggest that the addition of a low dose of bezafibrate to probucol tended to reverse probucol-induced HDL lowering, while 9.8% (5 of 51 patients) of the patients exhibited a severe HDL deficiency. Since it is unclear whether or not such an extreme HDL reduction is harmful, HDL deficiency should be carefully monitored with this combination therapy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198300
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  • 4
    Electronic Resource
    Electronic Resource
    X-ray Pole Figure Analysis of Apatite Crystals and Collagen Molecules in Bone (1997)
    Springer
    Calcified tissue international 60 (1997), S. 361 -367 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Mineral orientation — Mineral morphology — Collagen fiber orientation — X-ray pole figure analysis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. X-ray pole figure analysis was performed on apatite (AP) crystals in bone mineral and collagen molecules in the bone matrix. For AP in bone mineral, the (0002) plane (c-axis) and {2130} plane were examined. The diffraction peaks from both planes were well isolated from other diffraction peaks in the bone. To investigate the orientation of collagen molecules in the bone matrix, demineralized bone by EDTA treatment was used. For collagen, the diffraction peak from about the 0.3 nm period along the helix axis of the collagen molecule was investigated. The c-axis of AP and the helical axis of the collagen molecule have strongly preferred orientations in a direction parallel to the bone axis. The c-axis of AP has an appreciable pole density peak in the radial and tangential direction of the bone, whereas collagen molecules were almost uniaxially oriented in the bone axis direction though having an appreciable distribution. This suggests that there are more than two types of morphology in the AP particle in bone mineral: one with the c-axis almost parallel to the bone axis and the other in which the c-axis is oriented almost perpendicular to the bone axis. The {2130} plane has isolated peaks of pole density in pole figures in both radial and tangential directions. On the basis of the classification of orientation for elongated polyethylene, the main portion of AP particles in bone is concluded to be biaxially oriented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900244
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular dynamics study of shear and tensile deformation of bicrystalline aluminum (1995)
    Springer
    Computational mechanics 16 (1995), S. 69-73 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes shear and tensile deformation of bicrystalline aluminum by computer molecular dynamics. A bicrystal model with a [001] (310) ∑=5 tilt grain boundary is used for simulations. The simulations show that the effect of temperature on both the shear and tensile deformation is represented by a Boltzmann factor exp (-Q/k B T) and that the deformation is thermally activated in a typical manner. We found that the activation energy Q for the high temperature range, where T is higher than approximately 500 K to 600 K, is significantly larger than that for the low temperature range. This result shows that there are different deformation mechanisms between high and low temperatures. The activation energy difference is considered to be caused by a structural transition at the grain boundary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365860
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  • 6
    Electronic Resource
    Electronic Resource
    Molecular dynamics study of shear and tensile deformation of bicrystalline aluminum1 (1995)
    Springer
    Computational mechanics 16 (1995), S. 69-73 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  This paper describes shear and tensile deformation of bicrystalline aluminum by computer molecular dynamics. A bicrystal model with a [001] (310) Σ = 5 tilt grain boundary is used for simulations. The simulations show that the effect of temperature on both the shear and tensile deformation is represented by a Boltzmann factor exp (−Q/k B T ) and that the deformation is thermally activated in a typical manner. We found that the activation energy Q for the high temperature range, where T  is higher than approximately 500 K to 600 K, is significantly larger than that for the low temperature range. This result shows that there are different deformation mechanisms between high and low temperatures. The activation energy difference is considered to be caused by a structural transition at the grain boundary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365860
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  • 7
    Electronic Resource
    Electronic Resource
    Stimulation of human chorionic gonadotropin and progesterone secretion by tumor promoters, phorbol ester and teleocidin B, in cultured choriocarcinoma cells (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 330-331 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Both 12-O-tetradecanoyl-phorbol-1-acetate and teleocidin B stimulated the secretion of human chorionic gonadotropin by cultured choriocarcinoma cells. These tumor promoters also stimulated production of progesterone in the cells. However, the 2 tumor promoters did not exert a marked effect on the cellular binding of epidermal growth factor that also had a stimulatory effect on production of these hormones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955333
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamics of the cantilever in noncontact atomic force microscopy (1998)
    Springer
    Applied physics 66 (1998), S. S287 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.16.Ch; 62.20.-x; 68.45.Kg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051147
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical analysis of atomic-scale friction in frictional-force microscopy (1998)
    Springer
    Tribology letters 4 (1998), S. 125-128 
    Details
    ISSN: 1573-2711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We perform a theoretical analysis of frictional-force microscopy(FFM) images of a cleaved graphite surface. The Tomlinson model with a single-atom tip is powerful for reproducing experimental FFM images. A mapping relation between the tip atom position and the cantilever basal position obtained by a stable equilibrium condition, gives a clear explanation of the physical meaning of FFM image patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019151121009
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal expansion of aluminium borate (1993)
    Springer
    Journal of materials science 12 (1993), S. 1735-1737 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00517595
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