{"type": "FeatureCollection", "features": [{"id": "10.1016/j.epsl.2015.12.030", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:15:58Z", "type": "Journal Article", "created": "2016-01-05", "title": "Estimation of the extraterrestrial 3He and 20Ne fluxes on Earth from He and Ne systematics in marine sediments", "description": "Abstract   Sediments contain interplanetary dust particles (IDPs) carrying extraterrestrial noble gases, such as  3 He, which have previously been used to estimate the IDP accretion flux over time and the duration of past environmental events. However, due to its high diffusivity, He can be lost by diffusion either due to frictional heating during entry in the atmosphere, or once it has been incorporated in the sediments. Therefore the absolute values of  3 He IDP fluxes cannot be known. Due to its lower diffusivity, Ne is less likely to be lost by diffusion than He and can potentially provide an absolute IDP flux value. Here, we studied the Ne and He isotopic composition of 21 sediments of different ages (3 to 38 Myr, 56 Myr and 183 Myr) in order to better constrain the retention of  3 He in such deposits. The samples are carbonates from 2 sites of the Integrated Ocean Drilling Program (IODP), which previously showed evidence of detectable extraterrestrial  3 He, and from the Sancerre core in the Paris basin. The  3 He/ 4 He,  20 Ne/ 22 Ne and  21 Ne/ 22 Ne ratios of decarbonated residues vary respectively from    0.09  \u00d7    10    \u2212  6      to    76.5  \u00d7    10    \u2212  6     ,    9.54  \u00b1  0.08    to    11.30  \u00b1  0.60    and from    0.0295  \u00b1  0.0001    to    0.0344  \u00b1  0.0003   . These isotopic compositions can be explained by a mixing between two terrestrial components (atmosphere and radiogenic He and nucleogenic Ne present in the terrigenous fractions) and an extraterrestrial component. The linear relationship between  20 Ne/ 22 Ne and  3 He/ 22 Ne ratios shows that the extraterrestrial component has a unique composition and is similar to the He and Ne composition of implanted solar wind. This composition is different from the individual stratospheric IDPs for which the Ne and He isotopic compositions have been measured. We suggest that this difference is due to a bias in the sampling of the individual IDPs previously analyzed toward the largest ones that are more likely to lose He during entry in the atmosphere. Our data further constrains the size of the majority of the IDPs to be less than    10    \u03bc  m    in diameter. In addition, the constant  3 He/ 22 Ne ratio of the extraterrestrial component present in the samples, which is similar to the implanted solar wind composition, suggests that no diffusive loss of  3 He occurred in the atmosphere or on the seafloor. Thus, neglecting any non-fractionating He and Ne loss by weathering and/or alteration of the host phases on the seafloor, the extraterrestrial  3 He and  20 Ne fluxes between 3 to 38 Myr ago are respectively    0.2  \u00b1  0.1  \u00d7    10    \u2212  12        cm    3        cm    \u2212  2        kyr    \u2212  1      and    0.2  \u00b1  0.1  \u00d7    10    \u2212  11        cm    3        cm    \u2212  2        kyr    \u2212  1     . During the sharp increases of the late Eocene and late Miocene, the IDP  3 He and  20 Ne fluxes reach values up to five times higher.", "keywords": ["[SDU] Sciences of the Universe [physics]", "13. Climate action", "sediments", "IDP", "helium", "neon", "14. Life underwater", "extraterrestrial flux", "implanted solar wind", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.epsl.2015.12.030"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Earth%20and%20Planetary%20Science%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.epsl.2015.12.030", "name": "item", "description": "10.1016/j.epsl.2015.12.030", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.epsl.2015.12.030"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-02-01T00:00:00Z"}}, {"id": "10.5281/zenodo.10126878", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-05-25T16:21:53Z", "type": "Dataset", "title": "NEON Soil Radiocarbon Data", "description": "Radiocarbon measurements for megapit profiles from 17 NEON sites: 'BART' 'CLBJ' 'DSNY' 'JERC' 'NIWO' 'ONAQ' 'RMNP' 'SCBI' 'SOAP' 'TALL' 'UKFS' 'UNDE' 'WREF' 'OSBS' 'HARV' 'CPER' 'DCFS' Updated carbon concentrations missing from subset of samples and regularized 'archiveID' strings to facilitate joins with other NEON megapit data. The 'archiveID' field can be used to match data in the 'perarchivesample' tables from NEON.", "keywords": ["radiocarbon", "NEON"], "contacts": [{"organization": "Beem-Miller, Jeffrey, Sierra, Carlos A.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.10126878"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.10126878", "name": "item", "description": "10.5281/zenodo.10126878", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.10126878"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-09-20T00:00:00Z"}}, {"id": "10.5281/zenodo.7096826", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:23:28Z", "type": "Dataset", "title": "NEON Soil Radiocarbon Data", "description": "Radiocarbon measurements for megapit profiles from 17 NEON sites: 'BART' 'CLBJ' 'DSNY' 'JERC' 'NIWO' 'ONAQ' 'RMNP' 'SCBI' 'SOAP' 'TALL' 'UKFS' 'UNDE' 'WREF' 'OSBS' 'HARV' 'CPER' 'DCFS' Updated carbon concentrations missing from subset of samples and regularized 'archiveID' strings to facilitate joins with other NEON megapit data. The 'archiveID' field can be used to match data in the 'perarchivesample' tables from NEON.", "keywords": ["radiocarbon", "NEON"], "contacts": [{"organization": "Beem-Miller, Jeffrey, Sierra, Carlos A.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.7096826"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.7096826", "name": "item", "description": "10.5281/zenodo.7096826", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.7096826"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-09-20T00:00:00Z"}}, {"id": "aac6ae47d0f5fcd32e3687c113d7560c", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:28:43Z", "type": "Report", "title": "Breech presentation: Clinical practice guidelines from the French College of Gynaecologists and Obstetricians (CNGOF)", "description": "Objective: To determine the optimal management of singleton fetuses in breech presentation. Materials and methods: Consultation of the PubMed database, the Cochrane Library and guidelines issued by the French and foreign obstetrical societies or colleges. Results: In France, 5% of women have breech deliveries (level of evidence [LE] 3). One third of them have a planned vaginal delivery (LE3), and 70% of these give birth vaginally (LE3). External cephalic version (ECV) is associated with lower rates of both breech presentation at birth (LE2) and of cesarean deliveries (LE3) without any increase in severe maternal (LE3) or perinatal morbidity (LE3). Women with a fetus in breech presentation at term should be informed that ECV can be attempted starting at 36 weeks of gestation (professional consensus). Planned vaginal delivery of breech presentation may be associated with a higher risk of composite perinatal mortality or serious neonatal morbidity than planned cesarean birth (LE2). These two modes do not differ for neurodevelopmental outcomes at two years (LE2), cognitive and psychomotor outcomes between 5 and 8 years (LE3), or adult intellectual performance (LE4). Short- and long-term maternal complications appear similar in the two groups, unless subsequent pregnancies are under consideration. Pregnancies after a cesarean delivery are at higher risk of uterine rupture, placenta accreta spectrum disorders, and hysterectomy (LE2). Women who want a planned vaginal delivery should be offered a pelvimetry at term (Grade C) and should have ultrasonography to verify that the fetal head is not hyperextended (professional consensus) to plan their mode of delivery. Complete breech presentation, a previous cesarean, nulliparity, and term prelabor rupture of membranes are not, each one by itself, per se contraindications to planned vaginal delivery (professional consensus). Term breech presentation is not a contraindication to labor induction when the criteria for planned vaginal delivery are met (Grade C). Conclusion: In cases of breech presentation at term, the child and the mother are at low risk of severe morbidity after either planned vaginal or planned cesarean delivery. The French College of Obstetricians and Gynecologists (CNGOF) considers that planned vaginal delivery is a reasonable option in most cases (professional consensus). The decision about the planned route of delivery should be shared by the woman and her healthcare provider, who must respect her right to autonomy.", "keywords": ["[SDV.MHEP.GEO] Life Sciences [q-bio]/Human health and pathology/Gynecology and obstetrics", "External cephalic version", "Breech presentation", "Trial of labor", "Maternal and neonatal morbidity", "Planned cesarean delivery", "Planned vaginal delivery"], "contacts": [{"organization": "Sentilhes, L\u00f6ic, Schmitz, Thomas, Azria, \u00c9lie, Gallot, Dennis, Ducarme, Guillaume, Korb, Diane, Mattuizzi, Aur\u00e9lien, Parant, Olivier, Sanan\u00e8s, Nicolas, Baumann, Sophie, Rozenberg, Patrick, S\u00e9nat, Marie Victoire, Verspyck, \u00c9ric,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/aac6ae47d0f5fcd32e3687c113d7560c"}, {"rel": "self", "type": "application/geo+json", "title": "aac6ae47d0f5fcd32e3687c113d7560c", "name": "item", "description": "aac6ae47d0f5fcd32e3687c113d7560c", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/aac6ae47d0f5fcd32e3687c113d7560c"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=neon&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=neon&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=neon&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=neon&offset=4", "hreflang": "en-US"}], "numberMatched": 4, "numberReturned": 4, "distributedFeatures": [], "timeStamp": "2026-05-26T10:52:52.863385Z"}