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  • American Geophysical Union  (99)
  • International Union of Crystallography (IUCr)  (22)
  • PANGAEA
  • American Meteorological Society (AMS)
  • 2000-2004  (128)
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  • 1
    Digitale Medien
    Digitale Medien
    Crystallization and preliminary X-ray analysis of native and recombinant human bile-salt dependent lipase: strategies for improvement of diffraction quality (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 478-480 
    Details
    ISSN: 1399-0047
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Human bile-salt dependent lipase (BSDL), secreted into both the digestive tract and human milk, is integral to the effective absorption of dietary lipids. In attempts to obtain crystals suitable for high-resolution X-ray crystallographic studies, various forms of the enzyme have been crystallized, including native and desialidated human milk BSDL and both intact recombinant BSDL and a truncated form lacking the heavily glycosylated C-terminal repeat region. Trigonal crystals of native BSDL, with unit-cell parameters a = b = 90.0, c = 156.1 Å, were obtained using 15–20%(w/v) PEG 8000 as precipitant. These crystals diffract to 3.5 Å along the unique axis, but to only 5–7 Å in orthogonal directions. Crystals of recombinant truncated BSDL grown from 15–20%(w/v) PEG 6000 are orthorhombic, space group P212121, with unit-cell parameters a = 59.2, b = 90.0, c = 107.7 Å, and diffract to 2.6 Å resolution. These are suitable for structural analysis by X-ray crystallography.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0907444900000986
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  • 2
    Digitale Medien
    Digitale Medien
    Subunit dissociation and reassociation leads to preferential crystallization of haemoglobin Bart's (γ4) from solutions of human embryonic haemoglobin Portland (ζ2γ2) at low pH (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 921-924 
    Details
    ISSN: 1399-0047
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: A variety of human haemoglobins (Hbs) are produced at different stages of human development, including three embryonic Hbs, foetal Hb and adult Hb. All are heterotetramers. During crystallization experiments on human embryonic Hb Portland (ζ2γ2), it was discovered by crystallographic and biochemical analysis that the homotetramer Hb Bart's (γ4) preferentially crystallizes from ζ2γ2 solutions below pH 5. This results from dissociation of Hb Portland into γ2 dimers and ζ monomers and has interesting implications for subunit interactions and tetramer stability in Hbs. It also makes possible a full crystallographic analysis of Hb Bart's, which is of considerable medical significance because of its presence in the red blood cells of millions of people worldwide who suffer from α-thalassaemia.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0907444901004516
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  • 3
    Digitale Medien
    Digitale Medien
    Expression, crystallization and preliminary characterization of methylmalonyl coenzyme A epimerase from Propionibacterium shermanii (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 706-708 
    Details
    ISSN: 1399-0047
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Methylmalonyl-CoA epimerase (MMCE) is an enzyme that interconverts the R and S epimers of methylmalonyl-CoA in the pathway that links propionyl-CoA with succinyl-CoA. This is used for both biosynthetic and degradative processes, including the breakdown of odd-numbered fatty acids and some amino acids. The enzyme has been expressed in Escherichia coli both as the native enzyme and as its selenomethionine (SeMet) derivative. Crystals of both forms have been obtained by vapour diffusion using monomethylether PEG 2000 as precipitant. The native MMCE crystals are orthorhombic, with unit-cell parameters a = 56.0, b = 114.0, c = 156.0 Å, and the SeMet-MMCE crystals are monoclinic, with unit-cell parameters a = 43.6, b = 78.6, c = 89.4 Å, β = 92.0°; both diffract to better than 2.8 Å resolution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0907444901002050
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  • 4
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    Carbon and oxygen isotopic composition of benthic foraminifers from ODP Site 167-1014 and Hole 167-1020C (2000)
    PANGAEA
    In:  Supplement to: deMenocal, Peter B; Baker, Linda (2000): Data Report: Benthic stable isotope data from Sites 1014 and 1020 (0.6-1.2 Ma). In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-6, https://doi.org/10.2973/odp.proc.sr.167.202.2000
    Details
    Publikationsdatum: 2024-01-09
    Beschreibung: Benthic foraminiferal stable isotope data are presented for Sites 1014 (Tanner Basin, 1176 m) and 1020 (Gorda Ridge, 3040 m) to constrain past changes in Pacific deep- and intermediate-water nutrient chemistry associated with the onset of large-amplitude 100-k.y. climate cycles after ~900 ka. The Site 1014 data were based on analyses of separate species of Cibicidoides, whereas only Cibicidoides wuellerstorfi was used to generate the Site 1020 record. The present data span 380-920 and 620-950 ka at Sites 1014 and 1020, respectively.
    Schlagwort(e): Ocean Drilling Program; ODP
    Materialart: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    Geochemistry of Indian Ocean tephra and Afro-Arabian lavas (2003)
    PANGAEA
    In:  Supplement to: Ukstins Peate, Ingrid; Baker, Joel A; Kent, Adam J R; Al-Kadasi, Mohamed; Al-Subbary, Abdulkarim; Ayalew, Dereje; Menzies, Martin (2003): Correlation of Indian Ocean tephra to individual Oligocene silicic eruptions from Afro-Arabian flood volcanism. Earth and Planetary Science Letters, 211(3-4), 311-327, https://doi.org/10.1016/S0012-821X(03)00192-4
    Details
    Publikationsdatum: 2024-01-09
    Beschreibung: Widespread silicic pyroclastic eruptions of the Oligocene Afro-Arabian flood volcanic province (ignimbrites and airfall tuffs) produced up to 20% of the total flood volcanic stratigraphy (〉6*10**4 km**3). Volumes of individual ignimbrites and tuffs exposed on land range from ~150 to 〉2000 km**3 and eight major units (15-100 m thick) were erupted in 〈2 Myr, placing these amongst the largest-magnitude silicic pyroclastic eruptions on Earth. They are compositionally distinctive time-stratigraphic markers which were deposited as co-ignimbrite ashfall deposits on a near-global scale around the time of the Oi2 cooling anomaly at ~30 Ma. Two ignimbrites from the lower part of the flood volcanic succession in Yemen have been correlated to: (a) the conjugate rifted margin of Ethiopia (〉500 km distant); and (b) to two deep sea ash layers sampled by ODP Leg 115 in the Indian Ocean ~2700 km to the southeast. This correlation is based on whole rock analyses of silicic units for isotope ratios (Pb, Nd) and rare earth element compositions, in conjunction with novel in situ Pb isotope laser ablation multicollector inductively coupled plasma mass spectroscopy analysis of groundmass and glass shards. Compositional diversity preserved on the scale of individual ash shards in these deep sea tephra layers record chemical heterogeneity present in the silicic magma chambers that is not evident in the welded on-land deposits. Ages of the ash layers can be established by correlation to precisely dated on-land ignimbrites, and current evidence suggests that while these eruptions may have exacerbated already changing climatic conditions, they both marginally post-date the Oi2 global cooling anomaly.
    Schlagwort(e): 115-711A; DRILL; Drilling/drill rig; Joides Resolution; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Materialart: Dataset
    Format: application/zip, 3 datasets
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    DATEN PANGAEA
  • 6
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    (Table 1) Isotopic composition of benthic foraminifers from ODP Site 167-1014 sediments (2000)
    PANGAEA
    Details
    Publikationsdatum: 2024-01-09
    Schlagwort(e): 167-1014; Age model; Age model, orbital tuning; Cibicidoides mckannai, δ13C; Cibicidoides mckannai, δ18O; Cibicidoides pachyderma, δ13C; Cibicidoides pachyderma, δ18O; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; COMPCORE; Composite Core; Depth, composite; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Joides Resolution; Leg167; Mass spectrometer Finnigan MAT 252; North Pacific Ocean; Ocean Drilling Program; ODP; Planulina ariminensis, δ13C; Planulina ariminensis, δ18O; Sample code/label
    Materialart: Dataset
    Format: text/tab-separated-values, 795 data points
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  • 7
    facet.materialart.
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    (Table 2) Isotopic composition of Cibicidoides wuellerstorfi from ODP Hole 167-1020C sediments (2000)
    PANGAEA
    Details
    Publikationsdatum: 2024-01-09
    Schlagwort(e): 167-1020C; Age model; Age model, orbital tuning; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg167; Mass spectrometer Finnigan MAT 252; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label
    Materialart: Dataset
    Format: text/tab-separated-values, 312 data points
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  • 8
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    Age determination of ODP Hole 108-658C (Table 1) (2000)
    PANGAEA
    In:  Supplement to: deMenocal, Peter B; Ortiz, Joseph D; Guilderson, Thomas P; Adkins, Jess F; Sarnthein, Michael; Baker, Linda; Yarusinsky, Martha (2000): Abrupt onset and termination of the African Humid Period: rapid climate responses to gradual insolation forcing. Quaternary Science Reviews, 19(1-5), 347-361, https://doi.org/10.1016/S0277-3791(99)00081-5
    Details
    Publikationsdatum: 2024-01-09
    Beschreibung: A detailed (ca. 100 yr resolution) and well-dated (18 AMS 14C dates to 23 cal. ka BP) record of latest Pleistocene–Holocene variations in terrigenous (eolian) sediment deposition at ODP Site 658C off Cap Blanc, Mauritania documents very abrupt, large-scale changes in subtropical North African climate. The terrigenous record exhibits a well-defined period of low influx between 14.8 and 5.5 cal. ka BP associated with the African Humid Period, when the Sahara was nearly completely vegetated and supported numerous perennial lakes; an arid interval corresponding to the Younger Dryas Chronozone punctuates this humid period. The African Humid Period has been attributed to a strengthening of the African monsoon due to gradual orbital increases in summer season insolation. However, the onset and termination of this humid period were very abrupt, occurring within decades to centuries. Both transitions occurred when summer season insolation crossed a nearly identical threshold value, which was 4.2% greater than present. These abrupt climate responses to gradual insolation forcing require strongly non-linear feedback processes, and current coupled climate model studies invoke vegetation and ocean temperature feedbacks as candidate mechanisms for the non-linear climate sensitivity. The African monsoon climate system is thus a low-latitude corollary to the bi-stable behavior of high-latitude deep ocean thermohaline circulation, which is similarly capable of rapid and large-amplitude climate transitions.
    Schlagwort(e): 108-658C; Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; Canarias Sea; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg108; Ocean Drilling Program; ODP; Sample code/label
    Materialart: Dataset
    Format: text/tab-separated-values, 129 data points
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  • 9
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    (Table 1) Average major element concentrations for different shard morphologies of ODP Hole 115-711A (2003)
    PANGAEA
    Details
    Publikationsdatum: 2024-01-09
    Schlagwort(e): 115-711A; Aluminium oxide; Aluminium oxide, standard deviation; Calcium oxide; Calcium oxide, standard deviation; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Grains, counted/analyzed; Iron oxide, Fe2O3; Iron oxide, Fe2O3, standard deviation; Joides Resolution; Leg115; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Ocean Drilling Program; ODP; Potassium oxide; Potassium oxide, standard deviation; Rock type; Sample code/label; Sample type; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; South Indian Ridge, South Indian Ocean; Titanium dioxide; Titanium dioxide, standard deviation; Zirconium/Niobium ratio
    Materialart: Dataset
    Format: text/tab-separated-values, 184 data points
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  • 10
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    Unbekannt
    (Table 2) Trace element concentrations and Pb isotope ratios of glass shards from ODP Hole 115-711A (2003)
    PANGAEA
    Details
    Publikationsdatum: 2024-01-09
    Schlagwort(e): 115-711A; Barium; Barium, standard deviation; Cerium; Cerium, standard deviation; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Dysprosium; Dysprosium, standard deviation; Erbium; Erbium, standard deviation; Europium; Europium, standard deviation; Gadolinium; Grains, counted/analyzed; Inductively coupled plasma - mass spectrometry (ICP-MS); Joides Resolution; Lanthanum; Lanthanum, standard deviation; Lanthanum/Niobium ratio; Lanthanum/Samarium ratio; Lead-206/Lead-204 ratio; Lead-206/Lead-204 ratio, error; Lead-207/Lead-204 ratio; Lead-207/Lead-204 ratio, error; Lead-207/Lead-206, standard error; Lead-207/Lead-206 ratio; Lead-208/Lead-204 ratio; Lead-208/Lead-204 ratio, error; Lead-208/Lead-206 ratio; Lead-208/Lead-206 ratio, error; Leg115; Lutetium; Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS); Neodymium; Neodymium, standard deviation; Neodymium-143/Neodymium-144 ratio; Niobium; Niobium, standard deviation; Number; Ocean Drilling Program; ODP; Praseodymium; Rubidium; Rubidium, standard deviation; Samarium; Samarium, standard deviation; Sample code/label; Sample code/label 2; Sample type; South Indian Ridge, South Indian Ocean; Strontium; Strontium, standard deviation; Vanadium; Vanadium, standard deviation; Ytterbium; Ytterbium, standard deviation; Yttrium; Yttrium, standard deviation; Zirconium; Zirconium, standard deviation
    Materialart: Dataset
    Format: text/tab-separated-values, 398 data points
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