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  • Springer  (65)
  • American Physical Society  (9)
  • PANGAEA  (5)
  • Blackwell Science Ltd
  • International Union of Crystallography
  • 2005-2009
  • 2000-2004
  • 1990-1994  (82)
  • 1935-1939
  • 1990  (82)
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Keywords
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  • 2005-2009
  • 2000-2004
  • 1990-1994  (82)
  • 1935-1939
Year
  • 1
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    Elemental and stable isotopic composition of bulk carbonate samples of ODP Hole 115-716B (Table 1) (1990)
    PANGAEA
    In:  Supplement to: Malone, Mitchell J; Baker, Paul A; Burns, Stephen J; Swart, Peter K (1990): Geochemistry of periplatform carbonate sediments, Leg 115, Site 716 (Maldives Archipelago, Indian Ocean). In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 647-659, https://doi.org/10.2973/odp.proc.sr.115.184.1990
    Details
    Publication Date: 2024-02-10
    Description: Site 716 is a continuous sequence (upper Miocene to Holocene) of periplatform oozes and chalks from the Maldives Ridge, Indian Ocean. Mineralogical and geochemical studies of these carbonate sediments indicate that submarine burial diagenesis has played an important role in the induration of sediments at this site. Metastable carbonates, high-magnesium calcite (HMC) and aragonite, convert to low-magnesium calcite (LMC) rapidly, within 1.1 and 6.0 Ma, respectively. Strontium concentrations in carbonate decrease with depth as the result of the burial diagenesis of calcium car- bonate, primarily aragonite, with excess strontium being expelled into pore waters. The formation of celestite at depth indicates that sufficient diagenesis of carbonate sediments has occurred to saturate or supersaturate pore waters with re- spect to this authigenic mineral. Sodium also decreases monotonically with depth as a result of the burial diagenesis of calcium carbonate. Magnesium and carbon and oxygen isotopic curves are remarkably similar. Carbon isotopic compositions record inputs of 13C-enriched components from shallow carbonate banks. Magnesium concentrations vary widely, recording enhanced episodes of cementation by LMC with slightly elevated magnesium contents. Positive shifts in oxygen isotopic composition also record episodes of cementation during burial diagenesis. Intervals with increased accumulation rates of metastable components have undergone more rapid diagenesis than intervals with predominately pelagic deposition.
    Keywords: 115-716B; Atomic absorption spectrometry (AAS), Perkin-Elmer; Calcium carbonate; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Lakshadweep Sea; Leg115; Magnesium; Mass spectrometer Finnigan MAT 251; Ocean Drilling Program; ODP; Sample code/label; Sodium; Strontium; δ13C, carbonate; δ18O, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 3035 data points
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    DATA PANGAEA
  • 2
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    (Table 1) Mineralogy and geochemistry of samples from ODP Holes 115-707C and 115-715A (1990)
    PANGAEA
    Details
    Publication Date: 2024-02-10
    Keywords: 115-707C; 115-715A; Atomic absorption spectrometry (AAS), Perkin-Elmer; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Iron; Joides Resolution; Lakshadweep Sea; Leg115; Magnesium; Manganese; Mass spectrometer Finnigan MAT 251; Ocean Drilling Program; ODP; Rock type; Sample code/label; South Indian Ridge, South Indian Ocean; Strontium; Type; X-ray diffraction (XRD); δ13C; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 389 data points
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    DATA PANGAEA
  • 3
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    (Table 2) Estimated foramtion temperatures of secondary carbonates of ODP Holes 115-707C and 115-715A (1990)
    PANGAEA
    Details
    Publication Date: 2024-02-10
    Keywords: 115-707C; 115-715A; Calculated (Epstein et al., 1953); DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Lakshadweep Sea; Leg115; Mass spectrometer Finnigan MAT 251; Ocean Drilling Program; ODP; Sample code/label; Sample comment; South Indian Ridge, South Indian Ocean; Temperature, calculated; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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    DATA PANGAEA
  • 4
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    Geochemistry of secondary carbonates in ODP Leg 115 basalts (1990)
    PANGAEA
    In:  Supplement to: Burns, Stephen J; Swart, Peter K; Baker, Paul A (1990): Geochemistry of secondary carbonates in Leg 115 basalts: tracers of basalt/seawater interaction. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 93-101, https://doi.org/10.2973/odp.proc.sr.115.183.1990
    Details
    Publication Date: 2024-02-10
    Description: This report presents the results of a study of the stable isotopic and chemical composition of secondary carbonate minerals precipitated within basalts at Ocean Drilling Program Sites 707 and 715. At Site 715, the secondary carbonates are all composed of calcite and display a narrow range of carbon and oxygen stable isotope ratios, with values ranging from -2.75 per mil to 1.95 per mil PDB and -0.27 per mil to 2.86 per mil PDB, respectively. Strontium, iron, and manganese values of the samples are generally low. The geochemistry of Site 715 samples indicates that they precipitated from seawater-domi- nated fluids, at low temperatures, as is typical of secondary carbonates from most Deep Sea Drilling Project sites. In contrast, at Site 707, aragonite, siderite, and manganese-rich calcite occur as secondary carbonates in addition to calcite. The carbon isotopes of the Site 707 carbonates of all rock types are depleted in 13C. Values range from -2.79 per mil to -16.43 per mil PDB. Oxygen isotope values do not show a wide variation, ranging from -1.78 per mil to 1.17 per mil. The strontium contents of the samples range from 5200 to 8100 ppm for aragonites, and from 145 to 862 ppm for calcites. Iron and manganese contents are high in calcites and siderites and low in aragonites. Site 707 carbonates precipitated at low temperatures in a fairly closed system, in which basalt-seawater interaction has greatly influenced the chemistry of the pore fluids. The reactions occurring within the system before and in conjunction with secondary carbonate precipita- tion include oxidation of isotopically light methane, derived from fluids circulating within the basalts, and reduction of substantial amounts of iron and manganese oxides from the basalts.
    Keywords: 115-707C; 115-715A; DRILL; Drilling/drill rig; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    Elemental and stable isotopic composition of fine fraction samples of ODP Site 115-709 (Table 1) (1990)
    PANGAEA
    In:  Supplement to: Baker, Paul A; Malone, Mitchell J; Burns, Stephen J; Swart, Peter K (1990): Minor element and stable isotopic composition of the carbonate fine fraction: Site 709, Indian Ocean. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 661-675, https://doi.org/10.2973/odp.proc.sr.115.178.1990
    Details
    Publication Date: 2024-02-10
    Description: Stable isotopic and minor element compositions were measured on the fine fraction of pelagic carbonate sediments from Ocean Drilling Program Site 709 in the central Indian Ocean. This section ranges in age from 47 Ma to the present. The observed compositional variations are the result of either paleoceanographic changes (past oceanic chemical or temperature variations) or diagenetic changes. The CaCO3 record is little affected by diagenesis. From previous work, carbonate content is known to be determined by the interplay of biological productivity, water column dissolution, and dilution. The carbon isotopic record is generally similar to previously published curves. A good correlation was observed between sea-level high stands and high 13C/12C ratios. This supports Shackleton's hypothesis that as the proportion of organic carbon buried in marine sediments becomes larger, oceanic-dissolved inorganic carbon becomes isotopically heavier. This proportion appears to be higher when sea level is higher and organic carbon is buried in more extensive shallow-shelf sediments. The strontium content and oxygen isotopic composition of carbonate sediments are much more affected by burial diagenesis. Low strontium concentrations are invariably associated with high values of d18O, probably indicating zones of greater carbonate recrystallization. Nevertheless, there is an inverse correlation between strontium concentration and sea level that is thought to be a result of high-strontium aragonitic sedimentation on shallow banks and shelves during high stands. Iron and manganese concentrations and, to a lesser extent, magnesium and strontium concentrations and carbon isotopic ratios are affected by early diagenetic reactions. These reactions are best observed in a slumped interval of sediments that occurs between 13.0 and 17.5 Ma. As a result of microbial reduction of manganese and iron oxides and dissolved sulfate, it is hypothesized that small amounts of mixed-metal carbonate cements are precipitated. These have low carbon isotopic ratios and high concentrations of metals.
    Keywords: 115-709A; 115-709B; 115-709C; AGE; Atomic absorption spectrometry (AAS), Perkin-Elmer; Calcium carbonate; Calcium carbonate, dry weight; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Iron; Joides Resolution; Leg115; Magnesium; Manganese; Mass; Mass spectrometer Finnigan MAT 251; Ocean Drilling Program; ODP; Sample code/label; South Indian Ridge, South Indian Ocean; Strontium; Weighted; δ13C, carbonate; δ18O, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 2289 data points
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  • 6
    Electronic Resource
    Electronic Resource
    Information transmission during intra- and interspecific courtship inEphestia elutella andCadra figulilella (1990)
    Springer
    Journal of insect behavior 3 (1990), S. 589-602 
    Details
    ISSN: 1572-8889
    Keywords: Courtship ; information theory ; communication ; behavioral analysis ; Ephestia elutella ; Cadra figulilella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using information theory, courtship posturing in the moths Ephestia elutella(Hübner) and Cadra figulilella(Gregson) was analyzed for information transmission, which was partitioned into autocovariability (intraindividual transmission) and cross-covariability (interindividual transmission). This two-factor analysis was sufficient to account for more than 60% of the behavioral variance in males of E. elutellaand in both sexes of C. figulilelladuring intraspecific courtships; however, there were large residual variances in the behavior of male and female C. figulilelladuring interspecific courtships and in E. elutellafemales during both inter- and intraspecific courtships. In E. elutella,significant levels of transmission were attributable to both inter- and intraindividual effects, whereas in C. figulilella,only autocovariability was high and no interindividual communication could be assigned to courtship postures. Although courtship in these two species was qualitatively very similar and males readily courted nonconspecific females, high levels of reproductive isolation resulted from courtship. Male C. figulilellahad 94% fewer copulations with E. elutellafemales than with conspecific females and E. elutellamales had 78% fewer copulations with C. figulilellafemales than with conspecifics. These reductions were due to a differential response in both females and males, causing inter-specific courtships to be terminated much earlier than intraspecific courtships. This discrimination indicates that interindividual communication was indeed occurring during courtship and was only partially measured by analysis of postures. Thus, communication took place largely in some other modality, most likely the chemical modality, where species specificity is suggested for both male and female pheromones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052330
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  • 7
    Electronic Resource
    Electronic Resource
    Interval Newton/generalized bisection when there are singularities near roots (1990)
    Springer
    Annals of operations research 25 (1990), S. 181-196 
    Details
    ISSN: 1572-9338
    Keywords: Nonlinear algebraic systems ; Newton's method ; interval arithmetic ; Gauss-Seidel method ; global optimization ; singularities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract Interval Newton methods in conjunction with generalized bisection are important elemetns of algorithms which find theglobal optimum within a specified box X ⊂ ℝn of an objective function ϕ whose critical points are solutions to the system of nonlinear equationsF(X)=0with mathematical certainty, even in finite presision arithmetic. The overall efficiency of such a scheme depends on the power of the interval Newton method to reduce the widths of the coordinate intervals of the box. Thus, though the generalized bisection method will still converge in a box which contains a critical point at which the Jacobian matrix is singular, the process is much more costly in that case. Here, we propose modifications which make the generalized bisection method isolate singular solutions more efficiently. These modifications are based on an observation about the verification property of interval Newton methods and on techniques for detecting the singularity and removing the region containing it. The modifications assume no special structure forF. Additionally, one of the observations should also make the algorithm more efficient when finding nonsingular solutions. We present results of computational experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02283694
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  • 8
    Electronic Resource
    Electronic Resource
    Anticancer agent development. 5. X-ray structure and1H nmr spectral analysis of (1α,2α,5α,6α)-2,6-bis(3,4-methylenedioxyphenyl)-3,7-dioxabicyclo[3.3.0]octane-4,8-dione (1990)
    Springer
    Journal of chemical crystallography 20 (1990), S. 327-333 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound, C20H14O8, Mr=382.3, crystallized from chloroform in the centric space group P¯1 witha=6.516(4),b=6.798(3),c=9.545(7) Å,α=85.31(5),β=73.87(5), γ=79.59(4)°,V=399.2 Å3, and Dcalc=1.59 g cm−3 forZ=1. Least-squares refinement of 1035 observed [Fo≥5σ(Fo)] reflections led to the final agreement index ofR=0.074. The molecule resides on a crystallographic center of inversion and is disordered into two different conformations. This manifests itself as a 50/50 disorder at O(4), C(2), and C(3). The observed structure reveals acis relationship between the bridgehead hydrogen atoms and the aryl rings. The 90 MHz1H nmr spectrum of the title compound exhibits an AA′XX′ spin system with a H(1)C(2) to H(1)C(3) and H(1)C(2)′ to H(1)C(3)′ coupling constant of 2.8 Hz. Computer spectral simulation and Karplus equation analysis are utilized to illustrate a relaxation of the torsion angles between H(1)C(2) and H(1)C(3), and H(1)C(2)′ and H(1)C(3)′ is solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01274139
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  • 9
    Electronic Resource
    Electronic Resource
    Comparative study of courtship in twelve phycitine moths (Lepidoptera: Pyralidae) (1990)
    Springer
    Journal of insect behavior 3 (1990), S. 303-326 
    Details
    ISSN: 1572-8889
    Keywords: courtship ; Phycitinae ; behavioral evolution ; male pheromones ; hairpencils ; behavioral analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The courtship behavior of 12 phycitine moths (Lepidoptera: Pyralidae) was studied using frame-by-frame analysis of video recordings. Behavioral transitions during courtship were quantified for selected species and kinematic diagrams of courtship sequences were constructed. Interspecific similarities in courtship behaviors were measured by calculating Euclidean distances between species based on 12 courtship characters and by clustering species according to UPGMA (unweighted pair-group method using arithmetic averages). The resulting phenogram revealed two major behavioral patterns in courtship: (1) interactive and (2) simple. The former was characterized by a complex sequence in which, typically, a male approached a pheromoneemitting female, engaged in a head- to- head posture with the female, and then brought his abdomen over his head and struck the female on the head and thorax. This action brought male abdominal scent structures into close proximity with the female antennae. The male then attempted copulation from the head- to- head position by a dorsolateral thrust of the abdomen toward the female genitalia. Males of these species possessed scent structures located either on the eighth abdominal segment, or in a costal fold of the forewing, or both. Courtship in the second group was much more prosaic. After locating the female by response to her sex pheromone, the male simply attempted copulation by lateral abdominal thrusts under the female wing, without behavioral embellishments. Males of species exhibiting simple courtship had either no scent structures or structures that appeared vestigial. The grouping of species based on courtship characters was poorly correlated with taxonomic relationships, suggesting that the selective pressures governing the evolution and maintenance of courtship and male pheromones were distinct from those involved in the evolution of other morphological characters. While we argue that the primary force molding the evolution of courtship was an adaptive response to interspecific mating mistakes, we do not believe that isolation is brought about by the sequence of courtship behaviors themselves, due to the striking similarity in the sequence across several diverse species. Rather, these behaviors act to deliver more efficiently the male pheromonal message, which mayhave evolved for reproductive isolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052112
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  • 10
    Electronic Resource
    Electronic Resource
    Response of cabbage head weight to simulated Lepidoptera defoliation (1990)
    Springer
    Entomologia experimentalis et applicata 54 (1990), S. 181-187 
    Details
    ISSN: 1570-7458
    Keywords: Brassica oleracea ; cabbage ; yield loss ; economic threshold ; crop loss assessment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'étude a porté sur le poids des pommes de choux (Brassica oleracea) soumis à différentes intensités de défoliations répétées avant et pendant la formation des pommes. Pendant les trois années de l'étude, huit intensités de défoliation continue ont réduit le poids des pommes, mais le poids le plus élevé a toujours été obtenu avec une faible défoliation avant et pendant la formation des pommes. Ceci montre que le chou tolère une certaine défoliation avant et pendant la formation des pommes. Les résultats de cette étude ont été utilisés dans une analyse coût-bénéfice pour estimer le seuil économique de défoliation.
    Notes: Abstract Studies were conducted to determine the effects of continuous constant amounts of artificial defoliation through the preheading and heading growth stages on head weight of cabbage. High levels of continuous artificial defoliation caused a reduction in head weight in all three years of the study, but the highest yield was always attained at some low level of preheading or heading defoliation. These results demonstrate that cabbage is tolerant to some levels of continuous defoliation before and after head formation. Results from this study are incorporated into a cost-benefit analysis to estimate an economic threshold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343527
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