ライフサイエンスコーパス: alkenone

1 richer intracellular water, increasing alpha(alkenone).

2 ng species-specific biomarker lipids such as alkenones.

3 he deltaD values of the mixture of coeluting alkenones.

4 hydrogen isotopic measurement on individual alkenones.

5 using hydrogen isotope ratios of individual alkenones.

6 en isotope fractionation in alkenones (alpha(alkenone)), a class of acyl lipids specific to this spec

7 d the empirical relationship between C(37:4) alkenone abundance and sea-ice concentration, little is

8 nalyze the hydrogen isotope fractionation in alkenones (alpha(alkenone)), a class of acyl lipids spec

9 various tri- and tetrasubstituted conjugated alkenones and alkenoates is also obtained in this arylat

10 icient catalysts for the Michael reaction of alkenones and alkynones with malonates, alpha-cyano este

11 Alkenones are biomarkers produced solely by algae in the

12 hael reactions of alkynones, unlike those of alkenones, are shown to be irreversible.

13 an efficient procedure to isolate individual alkenones based on double-bond numbers using silica gel

14 Here, we investigate changes in alkenone-based annual mean and Globigerinoides ruber Mg/

15 Previously published records of alkenone-based CO(2) from high- and low-latitude ocean l

16 Alkenone-based pCO(2) estimates for the late Miocene ind

17 However, alkenone-based SST reconstructions in the northern high

18 Alkenone-based tropical SST records from the major ocean

19 nning, more ubiquitous records than those of alkenones but the sensitivity of this proxy to changes i

20 ndance of the C(37) tetra-unsaturated methyl alkenone (%C(37:4)).

21 an elevated percentage of tetra-unsaturated alkenones, C(37:4)%.

22 with increasing CO(2)(aq) and confirm alpha(alkenone) correlates with temperature and light.

23 a new sea-ice proxy with its characteristic alkenone distributions.

24 tures are on average ~9 degrees C lower than alkenone estimates, representing the first proxy dataset

25 ble carbon isotopic values of di-unsaturated alkenones extracted from deep sea cores to reconstruct p

26 Here we analyse alkenones from marine sediments in the eastern equatoria

27 ific hydrogen isotope analysis of individual alkenones has not been possible due to chromatographic c

28 t is responsible for elevated C(37:4) methyl alkenone in the northern high latitude oceans through ne

29 ss by correlating the concentration of C(37) alkenones in a global suite of core-top sediments with s

30 enone measurements to trace the producers of alkenones in combination with foraminiferal Mg/Ca and ox

31 ass spectrometry imaging (MSI) of long-chain alkenones in sediments from the Cariaco Basin(9-11) and

32 that multidecadal to centennial increases in alkenone-inferred Atlantic Water SSTs on the shelf occur

33 e global spatial distribution of sedimentary alkenones is primarily correlated to SSchla rather than

34 We show here that haptophyte-derived alkenones isolated from Bermuda Rise drift sediments are

35 Our alkenone isolation approach opens a new avenue for paleo

36 eltaD values and that coelution of different alkenones may lead to erroneous source water deltaD reco

37 ther than reconstructing growth water, alpha(alkenone) may be a powerful tool to elucidate the carbon

38 Here we provide detailed alkenone measurements to trace the producers of alkenone

39 ch is apparently due to lateral transport of alkenones on fine-grained particles from the Nova Scotia

40 We present a new high-resolution alkenone palaeotemperature reconstruction from the Gulf

41 H or D/H) of long-chain unsaturated ketones (alkenones) preserved in lake and marine sediments hold g

42 specific di-, tri- and tetraunsaturated C37 alkenones produced by an Emiliania huxleyi culture, as w

43 However, recent data indicate that marine alkenone producers, coccolithophores, do not produce mor

44 ents is not regionally constrained, and that alkenones producers play a dominant role in the global e

45 ents and is distinct from other known marine alkenone-producers, namely Emiliania huxleyi and Gephyro

46 We report a high-resolution alkenone reconstruction of conditions in the heart of th

47 Here, we further investigate alkenone records and demonstrate that Antarctic and suba

48 bility obtained from coral, foraminifer, and alkenone records are shown to be consistent with one ano

49 back as 4.2 Myr ago, while diatom and C37:4 alkenone records show a long-term trend towards colder a

50 rium/hydrogen (D/H) isotope ratios in fossil alkenones, salinity increased rapidly with the onset of

51 aeotemperature proxies: faunal abundance and alkenone saturation.

52 udy shows the potential of using sedimentary alkenones to estimate past phytoplankton biomass, which

53 The inverse correlation of alpha(alkenone) to CO(2)(aq) in our cultures suggests that car

54 f temperature over the past 5,600 y based on alkenone unsaturation in sediments of two lakes in West

55 mate record by combining measurements of the alkenone unsaturation index (U37(K)) with non-destructiv

56 Time series of alkenone unsaturation indices gathered along the Califor

57 truction of sea surface temperature based on alkenone unsaturation ratios in sediments of the Bermuda

58 hat the surface cooling reconstructed by the alkenone-unsaturation index coincided with surface water

59 Based on this and concurrent trends in a new alkenone varepsilonp record, we propose that decreasing

60 The results indicate that all alkenones were produced by coccolithophores and the high

61 These findings suggest that alkenones with different numbers of carbon-carbon double

62 ene vicinal C-N bonds formation of 2-bromo-2-alkenones with guanidine avoiding its NH-protection/deri

63 possible due to chromatographic coelution of alkenones with the same carbon chain length but differen

64 The pervasive inverse correlation of alpha(alkenone) with CO(2)(aq) in the modern and preindustrial

65 We find a strong decrease in the alpha(alkenone) with increasing CO(2)(aq) and confirm alpha(al