ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Stable carbon and nitrogen isotopic ratios of cores from the Bering Sea
    PANGAEA
    In:  Supplement to: Nakatsuka, Takeshi; Watanabe, Kazuki; Handa, Nobuhiko; Matsumoto, Eiji; Wada, Eitaro (1995): Glacial to interglacial surface nutrient variations of Bering Deep Basins recorded by d13C and d15N of sedimentary organic matter. Paleoceanography, 10(6), 1047-1061, https://doi.org/10.1029/95PA02644
    Details
    Publication Date: 2023-06-27
    Description: Stable carbon and nitrogen isotopic ratios (d13C and d15N) of organic matter were measured in three sediment cores from deep basins of the Bering Sea to investigate past changes in surface nutrient conditions. For surface water reconstructions, hemipelagic layers in the cores were distinguished from turbidite layers (on the basis of their sedimentary structures and 14C ages) and analyzed for isotopic studies. Although d13C profiles may have been affected by diagenesis, both d15N and d13C values showed common positive anomalies during the last deglaciation. We explain these anomalies as reflecting suppressed vertical mixing and low nutrient concentrations in surface waters caused by injection of meltwater from alpine glaciers around the Bering Sea.
    Keywords: Bering Sea; DR-13; DR-16; PC; Piston corer; St-11
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    (Table A1) Age determination of cores St-11, DR-16 and DR-13 from the Bering Sea
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age, 14C AMS; Age, dated; Age, dated standard deviation; Bering Sea; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DR-13; DR-16; Event label; PC; Piston corer; St-11
    Type: Dataset
    Format: text/tab-separated-values, 100 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 3
    facet.materialart.
    Unknown
    (Table A3) Carbon and nitrogen isotope measurements of cores St-11, DR-16 and DR-13 from the Bering Sea
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Bering Sea; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DR-13; DR-16; Event label; Mass spectrometer Finnigan MAT 251; Mass spectrometer Hitachi RMU-6RS; PC; Piston corer; St-11; δ13C, organic carbon; δ15N
    Type: Dataset
    Format: text/tab-separated-values, 311 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 4
    facet.materialart.
    Unknown
    (Table A2) Organic carbon and nitrogen contents of cores St-11, DR-16 and DR-13 from the Bering Sea
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Bering Sea; Carbon, organic, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DR-13; DR-16; Element analyser CHN; Event label; Nitrogen, total; PC; Piston corer; St-11
    Type: Dataset
    Format: text/tab-separated-values, 1432 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of polypeptides by microwave heating II. Function of polypeptides synthesized during repeated hydration-dehydration cycles (1990)
    Springer
    Journal of molecular evolution 31 (1990), S. 187-194 
    Details
    ISSN: 1432-1432
    Keywords: Origin of life ; Chemical evolution ; Prebiotic polypeptides ; Primitive enzymes ; Catalytic function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Polypeptides, synthesized from a mixture of amino acid amides by microwave heating during repeated hydration-dehydration cycles, showed hydrolase- and oxidoreductase-like catalytic activities. Poly(GAVDH), polypeptides synthesized from an equimolar mixture (each 0.1 M) of glycinamide,l-alaninamide,l-valinamide,l-aspartic acid α-amide, andl-histidinamide, catalyzed the hydrolysis of PNPAc. The hydrolytic rate of PNPAc with poly(GAVDH) was the quadruple of that ofl-histidine alone. Though the kcat values of different resulting polypeptides were 103–106 times less than those of native hydrolases, the Km value of the polypeptides further containing phenylalanine residues was nearly equal to that of the esterase. This result indicates the presence of hydrophobic interaction between a substrate and the polypeptides. Resulting polypeptides also showed catalytic activity for the reduction of ferricyanide ion [Fe(CN)3−] with NADH. The polypeptides seemed to have a strong affinity for adenine nucleotides, because the reaction was inhibited by adenine derivatives such as NAD+ and AppA. A hypothesis for the emergence of primitive protein enzymes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109495
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of polypeptides by microwave heating I. Formation of polypeptides during repeated hydration-dehydration cycles and their characterization (1990)
    Springer
    Journal of molecular evolution 31 (1990), S. 180-186 
    Details
    ISSN: 1432-1432
    Keywords: Origin of life ; Chemical evolution ; Prebiotic ; Polypeptide ; Amino acid amide ; Secondary structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Amino acid amides effectively reacted to produce polypeptides in response to microwave heating during repeated hydration-dehydration cycles. The polypeptides, formed from a mixture of glycinamide, alaninamide, valinamide, and aspartic acid α-amide, had molecular weights ranging from 1000 to 4000 daltons. Amino acids were incorporated into the polypeptides in proportion to the starting concentrations, with the exception of glycine whose incorporation was 1.5 times higher than that of the other amino acids. The polypeptides had some definite secondary structure, such as α-helix and β-sheet, in aqueous solution. This reaction provides not only a convenient method for abiotic peptide formation but also a convenient method for the chemical synthesis of peptides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109494
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Structural Investigation of a Laminaran isolated from Eisenia bicyclis (1961)
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 1078-1080 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In contrast to the modified Kylin method previously used by Nisizawa1, the small pieces of frond were extracted with about ten times their volume of 1 per cent hydrochloric acid at room temperature for five days. The crude laminaran was precipitated from the extract by the addition of five volumes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1921078a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Variability of the path of the Kuroshio ocean current over the past 25,000 years (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 592-595 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Kuroshio current is the strong northwestern component of the subtropical North Pacific Ocean gyre, and advects a large amount of heat from the tropics to northern mid-latitudes. The Kuroshio has bimodal stationary flow patterns, with small and large meander paths east of central Japan, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/33391
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Chemical studies on organic matter and carbon cycle in the ocean (1991)
    Springer
    Journal of oceanography 47 (1991), S. 49-61 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Chemistry of organic materials of the suspended and sinking particles, and the evaluation of the particulate materials for the carbon cycle of the ocean are described in this paper. Organic carbon (POC) and nitrogen (PON) of the suspended particles collected from various areas of the North through South Pacific were determined with considerably high variabilities in their concentration. Higher values of the POC and PON were obtained in the surface water of the higher latitudinal areas of both northern and southern hemispheres and the equatorial Pacific, while the lower values of these organic elements were measured in the middle latitudinal areas of the Pacific. These facts clearly indicate that inorganic nutrients supply to the surface water layers from the underlying water is primarily determinative factor to govern the concentration of the POC and PON in the surface water layer. POC and PON concentrations in the intermediate through deep waters, however, are much less variable in time and space. Carbohydrates, free and combined amino acids and lipid materials were major organic constituents of the suspended particles. The organic composition of the particles was extensively variable in region, time and depth. Such change in the organic composition was mainly caused by the production and decay of the free and combined amino acids, lipid materials and water extractable carbohydrate. Sinking particle which has high sinking rate over 100 m day−1 and can be collected only by sediment trap, also consists of carbohydrates, free and combined amino acids and lipid materials. A detailed analysis of the particle indicate that the sinking particle was much different from the suspended particle from the intermediate through deep waters in terms of the abundance of the biologically susceptible organic materials such as unsaturated hydrocarbon, fatty acid and water extractable carbohydrate often found in phytoplankton. These facts clearly indicate that the sinking particle plays an important role on the vertical transport of the biologically susceptible organic materials from the surface water to the deep water. Vertical flux of organic materials in various water depths was extensively measured in the North Pacific and Antarctic Ocean using the depth-series sediment trap system to collect the sinking particles from various depths of the waters. Regional and seasonal variabilities of the organic carbon flux at the various depths were obviously observed, however the attenuation rate of the organic carbon flux in the intermediate through deep water was not changed so much irrespective of the sampling time and region. The time-series sediment trap system was also using to determine the seasonal variation of the organic carbon flux. An average organic carbon flux at 1 km depth from this trap system was almost comparable to the amount of organic carbon degraded in the water deeper than 1 km depth, which was calculated from oxygen consumption rate of the deep water. Thus, it is clear that the sinking particle must play an important role in the carbon cycle of the deep water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02301755
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Some characteristic features of the vertical profile of organic matter in recent sediment from the Bering Sea (1980)
    Springer
    Journal of oceanography 36 (1980), S. 1-14 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Sedimentary samples were collected from a site (57°02.9′N, 176°57.4′W: 3,650 m) in the Aleutian Basin of the Bering Sea and analyzed for organic carbon, total nitrogen and various organic materials. Organic carbon and total nitrogen were measured in the range of 0.1–1.9% and 0.01–0.2% of the dry weight of the sediment, these values tended to decrease with depth, but considerably lower values were obtained in the volcanogenic sediment layers. Carbohydrate, amino acid and protein and lipid carbons accounted for 40% of the total organic carbon on the surface of the sediment, and this value tended to decrease with depth to 20% at 10m depth from the top of the core sample. The carbon to nitrogen (C/N) ratios ranged from 6.3 to 9.0. Vertical change in the values of the ratios can be understood in terms of a higher decay rate of amino acids and proteins. Radiocarbon age determinations on five sedimentary samples yielded sedimentation rates ranging from 37 to 90cm/1,000y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02209349
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...