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1 er thousand higher in delta18O than a second concretion.
2  the presence of bacteria in two distinctive concretions.
3 tolithiasis and patients without gallbladder concretions.
4 rops and soils also formed diagenetically as concretions.
5 reservation of residual bitumen cores in the concretions.
6 lfur isotope composition between fossils and concretions.
7 rate that formed the homogeneously pyritized concretions.
8 ith contrasting directions within individual concretions.
9 ios to determine the ages of these spherical concretions.
10 hose preserved in contemporaneous glendonite concretions (-8.5 to -4.7 per mille and -12.4 to -9.1 pe
11 aracter and distribution of Navajo haematite concretions allow us to infer host-rock properties and f
12    Diagenetic features include hematite-rich concretions and crystal-mold vugs.
13      Canaculotomy, curettage with removal of concretions and tubing with silicone stent for six weeks
14 phy (CT) on the skull-bearing portion of the concretion, and analyzed the geochemical composition of
15  volcanic ash, subsequent incorporation into concretions, and infilling of the fossils with sparry ca
16 cretions imaged on Mars to these terrestrial concretions, and investigate the implications for analog
17                 Isolated spherical carbonate concretions are frequently observed in finer grained mar
18                                Many of these concretions are isolated spheres, centered on fossils.
19 on-fecal origins of fossiliferous phosphatic concretions are more common than originally recognized.
20 s of syngenetic formation of these spherical concretions are still not fully clear.
21 isotope ratios measured from the core of one concretion average delta13C = 46 +/- 8 per thousand, con
22 ex (CPI) measurements of the silica-enriched concretions, bitumen cores and surrounding calcareous ro
23 ning sustainable production capacity in lime concretion black soils along the Huai River region of Ch
24 ved in the fossils are distinct from abiotic concretions but similar to some seen in later eumetazoan
25 (86)Sr ratio of isolated spherical carbonate concretions can be applied generally to determine the nu
26            Although coprolites and non-fecal concretions can be difficult to differentiate, unique fe
27 on about the taphonomic origin of phosphatic concretions can lead to erroneous paleobiological and pa
28 deformation of sedimentary layers around the concretions, combined with geochemical analyses, reveal
29                Here we describe a phosphatic concretion containing a small crocodylian from the Upper
30 rometry confirms high iron concentrations in concretion crusts.
31                    The size of hematite-rich concretions decreases up-section, documenting variation
32 we present evidence that spherical carbonate concretions (diameters phi : 14 ~ 37 mm) around tusk-she
33 al that Sr was incorporated into the CaCO(3) concretions during their rapid formation.
34           We interpret these spherules to be concretions formed by postdepositional diagenesis, again
35                                  The studied concretions formed in the Yatsuo Group of Miocene age in
36 the numerical ages of marine sediments, when concretions formed soon after sedimentation.
37 etic (post-depositional), haematite-cemented concretions found in the Jurassic Navajo Sandstone of so
38           This study investigates iron oxide concretions from the Jurassic Navajo Sandstone in Utah a
39  fossils and compare them to abiotic pyritic concretions from the same stratigraphic level.
40                  Here we present a model for concretion growth by diffusion, with chemical buffering
41 ding calcareous rocks, the rate of diffusive concretion growth during early diagenesis is shown using
42                        The formation of such concretions has been variously explained by diffusion of
43 ion ages of the isolated spherical carbonate concretions have never been determined.
44 sk-shells (Fissidentalium spp.), while other concretions have no shell fossils inside.
45 of all kinds of isolated spherical carbonate concretions identified in marine formations.
46                Here we compare the spherical concretions imaged on Mars to these terrestrial concreti
47                              Isolated silica concretions in calcareous sediments have unique shapes a
48                                   Phosphatic concretions in terrestrial settings are often identified
49 ratigraphy using (87)Sr/(86)Sr ratios of all concretions indicates an age of 17.02 +/- 0.27 Ma, with
50 d be useful to evaluate whether a phosphatic concretion is a coprolite.
51                      Most of the core of one concretion is homogeneous (16.7 +/- 1.2 per thousand) an
52 tals and the presence of abnormal biomineral concretions, known as keshi pearls, raises concerns abou
53 is extended formation process suggests these concretions may record paleomagnetic field changes, thou
54         Oxygen isotope compositions of these concretions, measured by ion microprobe, range from delt
55                                    Carbonate concretions occur in sedimentary rocks of widely varying
56                                            A concretion of the outermost particle layer into a dense
57 teorite ALH84001 contains small, disk-shaped concretions of carbonate with concentric chemical and mi
58                                  Bezoars are concretions of ingested matter which accumulate in the g
59   Analyses of diagenetic features (including concretions, raised ridges, and fractures) at high spati
60 at the formation of such spherical haematite concretions requires the presence of a permeable host ro
61 rious kinds of spherical carbonate (CaCO(3)) concretions revealed that they formed very rapidly under
62 eandering shaped morphologies underneath bio-concretionned rocky buildups.
63 with smaller and more abundant hematite-rich concretions than those seen previously, possible relict
64 s shown here suggest that isolated spherical concretions that are not associated with fossils might a
65        Signal loss corresponding to probable concretions was identified in 34 cases.
66  analyzed the geochemical composition of the concretion with electron microprobe, u-XRF, and fusion I
67 his approach reveals that ellipsoidal SiO(2) concretions with a diameter of a few cm formed rapidly a
68 mputerized tomography scans of a ferruginous concretion within the chest region of an ornithischian d
69 erved as calcitic void in-fills in carbonate concretions within a volcaniclastic horizon, and are rec
70            Culturing lacrimal secretions and concretions yielded Aggregatibacter aphrophilus in pure