1,415,613 Works

Experiment: Dissecting the impact of CO2 and pH on the mechanisms of photosynthesis and calcification in the coccolithophore Emiliania huxleyi, supplement to: Bach, Lennart Thomas; Mackinder, Luke C M; Schulz, Kai Georg; Wheeler, Glen; Schroeder, Declan C; Brownlee, Colin; Riebesell, Ulf (2013): Dissecting the impact of CO2 and pH on the mechanisms of photosynthesis and calcification in the coccolithophore Emiliania huxleyi. New Phytologist, 199(1), 121-134

Lennart Thomas Bach & Luke C M Mackinder
Coccolithophores are important calcifying phytoplankton predicted to be impacted by changes in ocean carbonate chemistry caused by the absorption of anthropogenic CO2. However, it is difficult to disentangle the effects of the simultaneously changing carbonate system parameters (CO2, bicarbonate, carbonate and protons) on the physiological responses to elevated CO2. Here, we adopted a multifactorial approach at constant pH or CO2 whilst varying dissolved inorganic carbon (DIC) to determine physiological and transcriptional responses to individual carbonate...

Experiment: changing carbonate chemistry influence on coccoliths formed by Emiliania huxleyi, supplement to: Bach, Lennart Thomas; Bauke, Christine; Meier, K J Sebastian; Riebesell, Ulf; Schulz, Kai Georg (2012): Influence of changing carbonate chemistry on morphology and weight of coccoliths formed by Emiliania huxleyi. Biogeosciences, 9(8), 3449-3463

Lennart Thomas Bach
The coccolithophore Emiliania huxleyi is a marine phytoplankton species capable of forming small calcium carbonate scales (coccoliths) which cover the organic part of the cell. Calcification rates of E. huxleyi are known to be sensitive to changes in seawater carbonate chemistry. It has, however, not yet been clearly determined how these changes are reflected in size and weight of individual coccoliths and which specific parameter(s) of the carbonate system drive morphological modifications. Here, we compare...

Temperature modulates coccolithophorid sensitivity of growth, photosynthesis and calcification to increasing seawater pCO2, supplement to: Sett, Scarlett; Bach, Lennart Thomas; Schulz, Kai Georg; Koch-Klavsen, Signe; Lebrato, Mario; Riebesell, Ulf (2014): Temperature Modulates Coccolithophorid Sensitivity of Growth, Photosynthesis and Calcification to Increasing Seawater pCO2. PLoS ONE, 9(2), e88308

Scarlett Sett, Lennart Thomas Bach, Kai Georg Schulz, Signe Koch-Klavsen, Mario Lebrato & Ulf Riebesell
Increasing atmospheric CO2 concentrations are expected to impact pelagic ecosystem functioning in the near future by driving ocean warming and acidification. While numerous studies have investigated impacts of rising temperature and seawater acidification on planktonic organisms separately, little is presently known on their combined effects. To test for possible synergistic effects we exposed two coccolithophore species, Emiliania huxleyi and Gephyrocapsa oceanica, to a CO2 gradient ranging from ~0.5-250 µmol/kg (i.e. ~20-6000 µatm pCO2) at three...

Alkenone stable carbon isotopes, carbonate stable carbon isotopes, calculated sea surface temperatures and atmospheric pCO2 for the Blue Clay Formation at Ras il-Pellegrin

Marcus P S Badger, Caroline H Lear, Richard D Pancost, Gavin L Foster, Trevor R Bailey, Melanie J Leng & Hemmo A Abels

Alkenone stable carbon isotopes, carbonate stable carbon and oxygen isotopes, planktic foraminifera boron isotopes and atmospheric CO2 calculations and box model results from Ras il-Pellegrin section, Malta, supplement to: Badger, Marcus P S; Lear, Caroline H; Pancost, Richard D; Foster, Gavin L; Bailey, Trevor R; Leng, Melanie J; Abels, Hemmo A (2013): CO2 drawdown following the middle Miocene expansion of the Antarctic Ice Sheet. Paleoceanography, 28(1), 42-53

Marcus P S Badger, Caroline H Lear, Richard D Pancost, Gavin L Foster, Trevor R Bailey, Melanie J Leng & Hemmo A Abels
The development of a permanent, stable ice sheet in East Antarctica happened during the middle Miocene, about 14 million years (Myr) ago. The middle Miocene therefore represents one of the distinct phases of rapid change in the transition from the "greenhouse" of the early Eocene to the "icehouse" of the present day. Carbonate carbon isotope records of the period immediately following the main stage of ice sheet development reveal a major perturbation in the carbon...

Carbon cycle modeling for the Blue Clay Formation at Ras il-Pellegrin

Marcus P S Badger, Caroline H Lear, Richard D Pancost, Gavin L Foster, Trevor R Bailey, Melanie J Leng & Hemmo A Abels

Stable isotopes of carbonates from the Blue Clay Formation at Ras il-Pellegrin

Marcus P S Badger, Caroline H Lear, Richard D Pancost, Gavin L Foster, Trevor R Bailey, Melanie J Leng & Hemmo A Abels

(Table S1) N15 isotope ratios, age determination and accumulation rates of sediment core HLY02-02-17, supplement to: Brunelle, Brigitte G; Sigman, Daniel M; Cook, Mea S; Keigwin, Lloyd D; Haug, Gerald H; Plessen, Birgit; Schettler, Georg; Jaccard, Samuel L (2007): Evidence from diatom-bound nitrogen isotopes for subarctic Pacific stratification during the last ice age and a link to North Pacific denitrification changes. Paleoceanography, 22(1), PA1215

Brigitte G Brunelle, Daniel M Sigman, Mea S Cook, Lloyd D Keigwin, Gerald H Haug, Birgit Plessen, Georg Schettler & Samuel L Jaccard
In a piston core from the central Bering Sea, diatom microfossil-bound N isotopes and the concentrations of opal, biogenic barium, calcium carbonate, and organic N are measured over the last glacial/interglacial cycle. Compared to the interglacial sections of the core, the sediments of the last ice age are characterized by 3 per mil higher diatom-bound d15N, 70 wt % lower opal content and 1200 ppm lower biogenic barium. Taken together and with constraints on sediment...

d11B and metal/Ca ratios versus size fractions in the Surface and deep dwelling species, ODP Holes 130-806B and 108-664C, supplement to: Ni, Yunyan; Foster, Gavin L; Bailey, Trevor R; Elliott, Tim; Schmidt, Daniela N; Pearson, Paul N; Haley, Brian A; Coath, Chris (2007): A core top assessment of proxies for the ocean carbonate system in surface-dwelling foraminifers. Paleoceanography, 22(3), PA3212

Yunyan Ni, Gavin L Foster, Trevor R Bailey, Tim Elliott, Daniela N Schmidt, Paul N Pearson, Brian A Haley & Chris Coath
We have assessed the reliability of several foraminifer-hosted proxies of the ocean carbonate system (d11B, B/Ca, and U/Ca) using Holocene samples from the Atlantic and Pacific oceans. We examined chemical variability over a range of test sizes for two surface-dwelling foraminifers (Globigerinoides sacculifer and Globigerinoides ruber). Measurements of d11B in G. ruber show no significant relationship with test size in either Atlantic or Pacific sites and appear to provide a robust proxy of surface seawater...

Sedimentology on a core from Lonar Lake in India, supplement to: Prasad, Sushma; Anoop, A; Riedel, N; Sarkar, Saswati; Menzel, Philip; Basavaiah, Nathani; Krishnan, R; Fuller, D; Plessen, Birgit; Gaye, Birgit; Röhl, Ursula; Wilkes, Heinz; Sachse, Dirk; Sawant, R; Wiesner, Martin G; Stebich, Martina (2014): Prolonged monsoon droughts and links to Indo-Pacific warm pool: A Holocene record from Lonar Lake, central India. Earth and Planetary Science Letters, 391, 171-182

Sushma Prasad, A Anoop, N Riedel, Sudipta Sarkar, Philip Menzel, Nathani Basavaiah, R Krishnan, D Fuller, Birgit Plessen, Birgit Gaye, Ursula Röhl, Heinz Wilkes, Dirk Sachse, R Sawant, Martin G Wiesner & Martina Stebich
Concerns about the regional impact of global climate change in a warming scenario have highlighted the gaps in our understanding of the Indian Summer Monsoon (ISM, also referred to as the Indian Ocean summer monsoon) and the absence of long term palaeoclimate data from the central Indian core monsoon zone (CMZ). Here we present the first high resolution, well-dated, multiproxy reconstruction of Holocene palaeoclimate from a 10 m long sediment core raised from the Lonar...

(Table 1) N-isotope record of planktonc foraminifera of sediment core MD02-2550C2, supplement to: Meckler, Anna Nele; Ren, Haojia; Sigman, Daniel M; Gruber, Nicolas; Plessen, Birgit; Schubert, Carsten J; Haug, Gerald H (2011): Deglacial nitrogen isotope changes in the Gulf of Mexico: Evidence from bulk sedimentary and foraminifera-bound nitrogen in Orca Basin sediments. Paleoceanography, 26(4), PA4216

Anna Nele Meckler, Haojia Ren, Daniel M Sigman, Nicolas Gruber, Birgit Plessen, Carsten J Schubert & Gerald H Haug
Constraining variations in marine N2-fixation over glacial-interglacial timescales is crucial for determining the role of the marine nitrogen cycle in modifying ocean productivity and climate, yet paleo-records from N2-fixation regions are sparse. Here we present new nitrogen isotope (d15N) records of bulk sediment and foraminifera test-bound (FB) nitrogen extending back to the last ice age from the oligotrophic Gulf of Mexico (GOM). Previous studies indicate a substantial terrestrial input during the last ice age and...

Biogeochemistry of sediment core SONK_11_D

Stefan Lauterbach, Roman Witt, Birgit Plessen, Peter Dulski, Sushma Prasad, Jens Mingram, Gerd Gleixner, Sabine Hettler-Riedel, Martina Stebich, Bernhard Schnetger, Antje Schwalb & Anja Schwarz
Sediment depth is given in composite depth (mcd).

(Table 1) Age determination of sediment core SONK_11_D

Stefan Lauterbach, Roman Witt, Birgit Plessen, Peter Dulski, Sushma Prasad, Jens Mingram, Gerd Gleixner, Sabine Hettler-Riedel, Martina Stebich, Bernhard Schnetger, Antje Schwalb & Anja Schwarz
Sediment depth is given in composite depth (mcd). Conventional 14C ages were calibrated using OxCal 4.1 (Ramsey, 1995, 2001, 2009) with the IntCal09 calibration data set (Reimer et al., 2009). Conventional 14C ages obtained from aquatic material and bulk sediment OM were corrected by -150 years before calibration to consider the hardwater effect. Samples down to 0.215 mcd were not considered for age modeling.

Lake Son Kol geochemistry, µXRF, biogeochemistry and pollen record, supplement to: Lauterbach, Stefan; Witt, Roman; Plessen, Birgit; Dulski, Peter; Prasad, Sushma; Mingram, Jens; Gleixner, Gerd; Hettler-Riedel, Sabine; Stebich, Martina; Schnetger, Bernhard; Schwalb, Antje; Schwarz, Anja (2014): Climatic imprint of the mid-latitude Westerlies in the Central Tian Shan of Kyrgyzstan and teleconnections to North Atlantic climate variability during the last 6000 years. The Holocene, 24(8), 970-984

Stefan Lauterbach, Roman Witt, Birgit Plessen, Peter Dulski, Sushma Prasad, Jens Mingram, Gerd Gleixner, Sabine Hettler-Riedel, Martina Stebich, Bernhard Schnetger, Antje Schwalb & Anja Schwarz
In general, a moderate drying trend is observed in mid-latitude arid Central Asia since the Mid-Holocene, attributed to the progressively weakening influence of the mid-latitude Westerlies on regional climate. However, as the spatio-temporal pattern of this development and the underlying climatic mechanisms are yet not fully understood, new high-resolution paleoclimate records from this region are needed. Within this study, a sediment core from Lake Son Kol (Central Kyrgyzstan) was investigated using sedimentological, (bio)geochemical, isotopic, and...

Survey preceding new local plan programme

Archaeology Department Östergötland County Museum
Informationen i sammanfattning är hämtad ur rapporten för undersökningen: Under våren 2002 utförde Östergötlands länsmuseum en arkeologisk utredning inom området för Gärstadverken och Leca i Linköping. Utredningen föranleddes av ett nytt detaljplaneprogram för Gärstadområdet och omfattade ca 100 hektar. De kända fornlämningarna i närområdet är huvudsakligen från bronsålder och äldre järnålder, så som en hällristningslokal, en skärvstenshög, stensträngskomplex och gravfält. Vid utredningen lokaliserades 7 områden som representerade presumtiva lägen för möjliga fornlämningar.

Radiographic Assessment and Chair Time of Rotary Instruments in the Pulpectomy of Primary Second Molar Teeth: A Randomized Controlled Clinical Trial

Abbas Makarem, Navid Ravandeh & Masoumeh Ebrahimi
Background and aims. The superiority of rotary systems has been reported in several clinical studies on permanent teeth. This study consisted of radiographic assessment and chair time of rotary instruments in the pulpectomy of primary second molar teeth. Materials and methods. In this randomized controlled clinical study, 46 children, 3-6 years of age, were selected. The patients were divided randomly into two groups. In the first group (group A) pulpectomy was carried out with hand...

Derrida i Wittgenstein: o iterowalności i kierowaniu się regułą

Piotr Skrzypczak
W tekście Sygnatura zdarzenie kontekst Derrida, analizując dominujące filozoficzne pojęcia pisma, wydobywa z niego cechę, którą nazywa „iterowalnością”. Jej bliższe zbadanie pozwala na zredefiniowanie tradycyjnego pojęcia komunikacji językowej, rozumianej jako proces przekazywania między podmiotami uprzedniego już i gotowego wobec tego procesu znaczenia. Sposób, w jaki Derrida charakteryzuje iterowalność, nasuwa skojarzenia z rozważaniami w Dociekaniach filozoficznych Wittgensteina na temat kierowania się regułą. Celem tego artykułu będzie zatem, z jednej strony, przedstawienie poglądów Derridy na temat iterowalności,...

Last of the Wild Project, Version 1, 2002 (LWP-1): Top One Percent Wild Areas Dataset (Geographic)

Wildlife Conservation Society-WCS; Center For International Earth Science Information Network-CIESIN-Columbia University
The Top One Percent Wild Areas Dataset of the Last of the Wild Project, Version 1, 2002 (LWP-1) is derived from the LWP-1 Human Footprint Dataset. The gridded data are classified according to their raster value (wild = 0-1; not wild >1). The top 1% of the wild areas within each biome by realm are selected and identified. This dataset is produced by the Wildlife Conservation Society (WCS) and Columbia University Center for International Earth...

Bootstrapping P2P VPN

Felix Weißl

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