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  • 1
    Publication Date: 2024-02-02
    Description: The Antarctic Cold Reversal (ACR; 14.7 to 13 ka) phase of the last deglaciation saw a pause in the rise of atmospheric pCO2 and Antarctic temperature, contrasted with warming in the North. Mechanisms associated with interhemispheric heat transfer have been proposed to explain features of this event, but the response of marine biota and the carbon cycle are debated. The Southern Ocean is a key site of deep-water exchange with the atmosphere, hence deglacial changes in nutrient cycling, circulation, and productivity in this region may have global impact. Here we present a new perspective on the sequence of events in the deglacial Southern Ocean, that includes multi-faunal benthic assemblage (foraminifera and cold-water corals) and geochemical data (Ba/Ca, 14C, δ11B) from the Drake Passage. Our records feature anomalies during peak ACR conditions indicative of circulation, biogeochemistry, and regional ecosystem perturbations. Within this cold episode, peak abundances of thick-walled benthic foraminifera and cold-water corals are observed at shallow depths in the sub-Antarctic (~300 m), while coral populations at greater depths and further south diminished. Geochemical data indicate that habitat shifts were associated with enhanced primary productivity in the sub-Antarctic, a more stratified water column, and poorly oxygenated bottom water. These results are consistent with northward migration of primary production in response to Antarctic cooling and widespread biotic turnover across the Southern Ocean. We suggest that expanding sea ice, suppressed ventilation, and shifting centres of upwelling drove changes in planktic and benthic ecology, and were collectively instrumental in halting CO2 rise in the mid-deglaciation.
    Keywords: Alabaminella weddellensis; Angulogerina earlandi; Bolivina spp.; Bulimina aculeata; Bulimina sp.; Calendar age; Cassidulina carinata; Cassidulina crassa; Cibicidoides spp.; Core; DEPTH, sediment/rock; Epistominella exigua; Falkland Plateau, Southern Falkland Plateau (same site as GC526); Fissurina spp.; Foraminifera; Foraminifera, benthic agglutinated; Fursenkoina fusiformis; GC; GC528 CORE_NO 528; Globobulimina sp.; Gravity corer; Hoeglundina elegans; Hoeglundina sp.; James Clark Ross; JR20110128; JR244; JR244-GC528; Lagena spp.; Melonis barleeanus; Melonis spp.; Nonionella auris; Nonionella pulchella; Nonionella spp.; Number of taxa; Nuttallides umbonifera; Oridorsalis sp.; Oridorsalis umbonatus; Pullenia bulloides; Pullenia quinqueloba; Pyrgo spp.; Sphaeroidina bulloides; Total counts; Triloculina spp.; Uvigerina bifurcata; Uvigerina spp.; Wet mass
    Type: Dataset
    Format: text/tab-separated-values, 4995 data points
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2024-02-02
    Description: The Antarctic Cold Reversal (ACR; 14.7 to 13 ka) phase of the last deglaciation saw a pause in the rise of atmospheric pCO2 and Antarctic temperature, contrasted with warming in the North. Mechanisms associated with interhemispheric heat transfer have been proposed to explain features of this event, but the response of marine biota and the carbon cycle are debated. The Southern Ocean is a key site of deep-water exchange with the atmosphere, hence deglacial changes in nutrient cycling, circulation, and productivity in this region may have global impact. Here we present a new perspective on the sequence of events in the deglacial Southern Ocean, that includes multi-faunal benthic assemblage (foraminifera and cold-water corals) and geochemical data (Ba/Ca, 14C, δ11B) from the Drake Passage. Our records feature anomalies during peak ACR conditions indicative of circulation, biogeochemistry, and regional ecosystem perturbations. Within this cold episode, peak abundances of thick-walled benthic foraminifera and cold-water corals are observed at shallow depths in the sub-Antarctic (~300 m), while coral populations at greater depths and further south diminished. Geochemical data indicate that habitat shifts were associated with enhanced primary productivity in the sub-Antarctic, a more stratified water column, and poorly oxygenated bottom water. These results are consistent with northward migration of primary production in response to Antarctic cooling and widespread biotic turnover across the Southern Ocean. We suggest that expanding sea ice, suppressed ventilation, and shifting centres of upwelling drove changes in planktic and benthic ecology, and were collectively instrumental in halting CO2 rise in the mid-deglaciation.
    Keywords: AGE; Age, error; Benthic foraminifera; circulation; cold-water corals; DH117; DH40; DH43; DH74; DH75; DR23; DR27; DR34; DR35; DR38; DR40; Drake Passage; Dredge; DRG; Elevation of event; Event label; Genus; Latitude of event; Location; Method comment; Nathaniel B. Palmer; NBP0805; NBP0805-DR22; NBP0805-DR23; NBP0805-DR27; NBP0805-DR34; NBP0805-DR35; NBP0805-DR36; NBP0805-DR38; NBP0805-DR39; NBP0805-DR40; NBP0805-TB04; NBP0805-TB04a; NBP1103; NBP1103-DH07; NBP1103-DH09; NBP1103-DH11; NBP1103-DH112; NBP1103-DH113; NBP1103-DH115; NBP1103-DH117; NBP1103-DH120; NBP1103-DH128; NBP1103-DH129; NBP1103-DH134; NBP1103-DH138; NBP1103-DH14; NBP1103-DH140; NBP1103-DH141; NBP1103-DH143; NBP1103-DH15; NBP1103-DH16; NBP1103-DH19; NBP1103-DH22; NBP1103-DH24; NBP1103-DH36; NBP1103-DH37; NBP1103-DH38; NBP1103-DH40; NBP1103-DH43; NBP1103-DH74; NBP1103-DH75; NBP1103-DH87; NBP1103-DH88; NBP1103-DH91; NBP1103-DH95; NBP1103-DH96; NBP1103-DH97; NBP1103-TB01; NBP1103-TB02; NBP1103-TB10; NBP1103-TO104; pH; productivity; Reference/source; Sample ID; Scotia Sea; South Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 8524 data points
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2024-02-02
    Description: The Antarctic Cold Reversal (ACR; 14.7 to 13 ka) phase of the last deglaciation saw a pause in the rise of atmospheric pCO2 and Antarctic temperature, contrasted with warming in the North. Mechanisms associated with interhemispheric heat transfer have been proposed to explain features of this event, but the response of marine biota and the carbon cycle are debated. The Southern Ocean is a key site of deep-water exchange with the atmosphere, hence deglacial changes in nutrient cycling, circulation, and productivity in this region may have global impact. Here we present a new perspective on the sequence of events in the deglacial Southern Ocean, that includes multi-faunal benthic assemblage (foraminifera and cold-water corals) and geochemical data (Ba/Ca, 14C, δ11B) from the Drake Passage. Our records feature anomalies during peak ACR conditions indicative of circulation, biogeochemistry, and regional ecosystem perturbations. Within this cold episode, peak abundances of thick-walled benthic foraminifera and cold-water corals are observed at shallow depths in the sub-Antarctic (~300 m), while coral populations at greater depths and further south diminished. Geochemical data indicate that habitat shifts were associated with enhanced primary productivity in the sub-Antarctic, a more stratified water column, and poorly oxygenated bottom water. These results are consistent with northward migration of primary production in response to Antarctic cooling and widespread biotic turnover across the Southern Ocean. We suggest that expanding sea ice, suppressed ventilation, and shifting centres of upwelling drove changes in planktic and benthic ecology, and were collectively instrumental in halting CO2 rise in the mid-deglaciation.
    Keywords: AGE; Age, uncertainty; Barium/Calcium ratio; Benthic foraminifera; circulation; cold-water corals; Comment; Depth, bathymetric; DH117; DH74; DH75; DR27; DR34; DR35; DR38; DR40; Drake Passage; Dredge; DRG; Elevation of event; Event label; Genus; Latitude of event; Longitude of event; Nathaniel B. Palmer; NBP0805; NBP0805-DR27; NBP0805-DR34; NBP0805-DR35; NBP0805-DR36; NBP0805-DR38; NBP0805-DR40; NBP0805-TB04; NBP1103; NBP1103-DH07; NBP1103-DH11; NBP1103-DH112; NBP1103-DH113; NBP1103-DH117; NBP1103-DH120; NBP1103-DH14; NBP1103-DH15; NBP1103-DH16; NBP1103-DH19; NBP1103-DH74; NBP1103-DH75; pH; productivity; Reference/source; Sample ID; Site; South Pacific Ocean; δ11B, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 1741 data points
    Location Call Number Limitation Availability
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  • 4
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: 3-Azidophenyl- and 3-isothiocyanatophenyl- and 2-(5′-azidopentyl)- and 2-(5′-isothiocyanatopentyl)pyrazoles were synthesized to determine whether these compounds could behave as covalently binding ligands for the CB1 cannabinoid receptor in rat brain membranes. Heterologous displacement of [3H]CP55940 indicated that the apparent affinity of these compounds for the CB1 receptor was similar to that of the parent compound, SR141716A, with the exception of the 3-isothiocyanato derivatives, which showed a 10-fold loss of affinity. The 3-azidophenyl and 3-isothiocyanatophenyl compounds behaved as antagonists against the cannabinoid agonist desacetyllevonantradol in activation of G proteins [guanosine 5′-O-(γ-35S]thio)triphosphate ([35S]GTPγS) binding] and regulation of adenylyl cyclase. The 2-(5′-azidopentyl)- and 2-(5′-isothiocyanatopentyl)pyrazoles were poor antagonists for [35S]GTPγS binding, and both compounds failed to antagonize the cannabinoid regulation of adenylyl cyclase. After incubation with the isothiocyanato analogues or UV irradiation of the azido analogues, the 3-substituted aryl pyrazoles formed covalent bonds with the CB1 receptor as evidenced by the loss of specific binding of [3H]CP55940. In the case of the isothiocyanato analogues, the log concentration-response curve for cannabinoid-stimulated [35S]GTPγS binding was shifted to the right, indicating that loss of receptors compromised signal transduction capability. These irreversibly binding antagonists might be useful tools for the investigation of tolerance and receptor down-regulation in both in vitro and in vivo studies.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1600-065X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary:  Components of the type 2 immune response may mediate host protection against both helminthic parasites and harmful allergic responses. A central player in this response is the T-helper 2 (Th2) effector cell, which produces interleukin (IL)-4, IL-5, IL-13, and other Th2 cytokines during the primary and memory response. Specific aspects of the parasite that trigger Th2-cell differentiation are not yet defined. Furthermore, the cell types and cell surface and secreted molecules that provide the immune milieu required for the development of Th2 effector cells and also Th2 memory cells are not well understood. They will probably vary with the particular helminth or other antigen inducing the Th2 response. We have used third stage larvae of intestinal nematode parasites as adjuvants to promote naïve nonparasite antigen-specific T cells to differentiate into Th2 cells. This model system avoids possible parasite antigen-specific T-cell clones or cross-reactive memory T cells that may preferentially differentiate into Th2 effector cells during the course of infection and confound the stereotypical components of parasite-induced Th2 cell differentiation. We have found that these parasites have a potent adjuvant effect and have used our model system to begin to investigate the events that lead to the development of polarized Th2 cells in vivo.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2023-08-08
    Description: Through the Cooperative Study of the Kuroshio and Adjacent Regions (CSK) program during 1965–1979, the capacities of current member states (MSs) of the Sub-Commission for the Western Pacific (WESTPAC) of the Intergovernmental Oceanographic Commission (IOC) were enhanced with regard to regional ocean science and data management. Following the termination of the CSK in 1979, each MS continued the work to advance ocean science. The results of scientific studies of the Kuroshio and its adjacent regions have been published by various experts including many from the MSs of the WESTPAC; however, to-date, there has been no systematic approach to the research of the Kuroshio and its adjacent regions. This review considered the Kuroshio from the regional perspective of experts of the MSs, that is, from the perspectives of MSs, science, and the future prospects. Experts from each MS reviewed past activities and con tributions and reviewed the knowledge gaps in the fields of physical, biological, and biogeochemical science. Many scientific questions remain regarding the path of the Kuroshio from south to north, as well as associated phenomena, including mesoscale eddies and fronts, the important roles of ocean variations in adjacent regions, and the different roles and mechanisms of air–sea interactions in low- and mid-latitude areas. Despite consid erable effort by many biologists, substantial gaps remain in our biological knowledge of the region. The Kuroshio and its adjacent regions comprise one of the areas of the world with high biodiversity; however, there has been insufficient research into what is the cause of this high biodiversity. From a biogeochemical aspect, high resolution spatiotemporal observations will be required to understand interactions with physical processes both in the Kuroshio region and in the marginal seas. It has been highlighted that long-term fixed-location observations will be needed to understand the key mechanisms of biogeochemical processes, particularly in relation to climate change.
    Description: From Decade Action UN24. Explore the strongest ocean current in the Western Pacific: the 2nd Cooperative Study of Kuroshio and Adjacent Regions – from its sciences to human well beings (CSK-2)
    Description: Published
    Description: Refereed
    Keywords: Marginal seas ; CSK ; IOC ; WESTPAC
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 35pp.
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  • 7
    Publication Date: 2013-07-04
    Description: With the oil industrialization area increasing and the fine Petrophysics block decreasing, the oil field is faced with the situation that isn’t enough potential, thus it’s necessary to begin effective developing in formation type III, which has high potential, strong heterogeneity and low permeability. It’s important for reservoir development to understand porous flow law in formation type III. There is a large reserve in formation type III of X block in Daqing Oil Field, whose main formation type is thin and poor formation with thin thickness and poor Petrophysics. To find the boundary value for Non-Darcy porous flow in formation type III, we study the pressure number to recognize Non-Darcy porous flow and Non-Darcy porous flow index in characteristic curve for porous flow. We also study the Non-Darcy porous flow boundary value with two methods, pressure number method whose result is 107 mD, Non-Darcy porous flow index method whose result is 120 mD. The two values are similar, thus the Non-Darcy porous flow degree increases sharply when permeability is less than 10 mD. The study provides theory guide for improving residual oil potential and enhancing development effect in formation type III. Key Words : Thin and poor formation; Non-Darcy porous flow boundary value; Pressure number; Non-Darcy porous flow index  
    Print ISSN: 1925-542X
    Electronic ISSN: 1925-5438
    Topics: Geosciences
    Published by CSCanada
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  • 8
    Publication Date: 2013-07-13
    Description: In the title compound, [Ni(C 12 H 11 N 2 ) 2 ], the Ni II cation lies on an inversion centre and has a square-planar coordination geometry. This transition metal complex is composed of two deprotonated N , N ′-bidentate 2-[(phenylimino)ethyl]-1 H -pyrrol-1-ide ligands around a central Ni II cation, with the pyrrolide rings and imine groups lying trans to each other. The Ni—N bond lengths range from 1.894 (3) to 1.939 (2) Å and the bite angle is 83.13 (11)°. The Ni—N(pyrrolide) bond is substantially shorter than the Ni—N(imino) bond. The planes of the phenyl rings make a dihedral angle of 78.79 (9)° with respect to the central NiN 4 plane. The molecules are linked into simple chains by an intermolecular C—H...π interaction involving a phenyl β-C atom as donor. Intramolecular C—H...π interactions are also present.
    Print ISSN: 0108-2701
    Electronic ISSN: 1600-5759
    Topics: Chemistry and Pharmacology , Geosciences , Physics
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  • 9
    Publication Date: 2013-09-26
    Description: The title compounds, 3,4-dimethyl- N -[1-(1 H -pyrrol-2-yl)ethylidene]aniline, C 14 H 16 N 2 , (I), and its analogue 3,4-dimethyl- N -[1-(1-thiophen-2-yl)ethylidene]aniline, C 14 H 15 NS, (II), both have basic heterocyclic imino structures showing a planar backbone with similar features, but differing in the heteroatoms of the five-membered heterocyclic rings, i.e. N in (I) and S in (II). The dihedral angles formed by the five-membered and benzene rings are 81.78 (8) and 75.89 (7)° for (I) and (II), respectively. In (I), centrosymmetric iminopyrrole dimers are assembled by means of two inverted N—H...N hydrogen bonds and two inverted C—H...π interactions. In (II), however, molecules are linked by nonclassical C—H...N hydrogen bonds in which the molecules act as both hydrogen-bond donors and acceptors, resulting in one-dimensional supramolecular chains.
    Print ISSN: 0108-2701
    Electronic ISSN: 1600-5759
    Topics: Chemistry and Pharmacology , Geosciences , Physics
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  • 10
    Publication Date: 2014-04-03
    Description: Background: The MADS-box transcription factors play fundamental roles in reproductive developmental control. Although the roles of many plant MADS-box proteins have been extensively studied, there are almost no functional studies of them in soybean, an important protein and oil crop in the world. In addition, the MADS-box protein orthologs may have species-specific functions. Controlling male fertility is an important goal in plant hybrid breeding but is difficult in some crops like soybean. The morphological structure of soybean flowers prevents the cross-pollination. Understanding the molecular mechanisms for floral development will aid in engineering new sterile materials that could be applied in hybrid breeding programs in soybean.Result: Through microarray analysis, a flower-enriched gene in soybean was selected and designated as GmMADS28. GmMADS28 belongs to AGL9/SEP subfamily of MADS-box proteins, localized in nucleus and showed specific expression patterns in floral meristems as well as stamen and petal primordia. Expression of GmMADS28 in the stamens and petals of a soybean mutant NJS-10Hfs whose stamens are converted into petals was higher than in those of wild-type plants. Constitutive expression of GmMADS28 in tobacco promoted early flowering and converted stamens and sepals to petals. Interestingly, transgenic plants increased the numbers of sepal, petal and stamen from five to six and exhibited male sterility due to the shortened and curly filaments and the failure of pollen release from the anthers. The ectopic expression of GmMADS28 was found to be sufficient to activate expression of tobacco homologs of SOC1, LEAFY, AGL8/FUL, and DEF. In addition, we observed the interactions of GmMADS28 with soybean homologs of SOC1, AP1, and AGL8/FUL proteins. Conclusion: In this study, we observed the roles of GmMADS28 in the regulation of floral organ number and petal identity. Compared to other plant AGL9/SEP proteins, GmMADS28 specifically regulates floral organ number, filament length and pollen release. The sterility caused by the ectopic expression of GmMADS28 offers a promising way to genetically produce new sterile material that could potentially be applied in the hybrid breeding of crops like soybean.
    Electronic ISSN: 1471-2229
    Topics: Biology
    Published by BioMed Central
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