cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.718398
title: Other measurements at 10 m from station Boulder, SURFRAD (1998-05)

description: Version 2, 2009-06-12
DOI: 10.1594/pangaea.827675
title: Basic measurements of radiation at station Nauru Island (2008-03)

description: Version 2, 2014-01-24
DOI: 10.1594/pangaea.694138
title: Nutrient concentrations in water samples from the Aegean Sea at Station JUNE-1998-IR20
DOI: 10.1594/pangaea.932587
title: Snow depth measurements during the ALERT2018 campaign (MAP Last Ice) at station ALERT2018_10

description: Point measurements of snow depth were obtained using a Magna Probe (Snow-Hydro, Fairbanks, AK, USA) during walking surveys on First-Year-Ice during the ALERT2018 campaign (Multidisciplinary Arctic Program (MAP) - Last Ice) off Alert, Nunavut, Canada in the Lincoln Sea in May 2018. The walks were along a 100 m transect and across an approx. 100 times 100 m wide patch.
DOI: 10.1594/pangaea.748397
title: (Table 1) Modal composition of basalts from ODP Hole 111-504B
DOI: 10.1594/pangaea.828850
title: Gamma ray attenuation bulk density from IODP Hole 339-U1389B

description: Geocode = Depth CSF-A (m)
DOI: 10.1594/pangaea.665711
title: Oceanography at CTD/bottle station IFREMER_2537
DOI: 10.1594/pangaea.717958
title: Ultra-violet measurements from station Boulder, SURFRAD (2005-08)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-09.
DOI: 10.1594/pangaea.751156
title: Meteorological observations during PERSEUS cruise from St. Augustines to Charlestown started at 1778-09-02
DOI: 10.1594/pangaea.718711
title: Ultra-violet measurements from station Boulder, SURFRAD (2004-10)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-09.
DOI: 10.1594/pangaea.720205
title: Ultra-violet measurements from station Desert Rock (2002-12)

description: Version 2, 2009-06-16. UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-08.
DOI: 10.1594/pangaea.717941
title: Basic measurements of radiation at station Boulder, SURFRAD (2005-04)
DOI: 10.1594/pangaea.721118
title: Ultra-violet measurements from station Fort Peck (2003-12)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-03.
DOI: 10.1594/pangaea.691489
title: Monthly landings in 1998, Antofagasta, Chile
DOI: 10.1594/pangaea.868345
title: Basic and other measurements of radiation at station Tiksi (2014-08)

description: New version (2016-11-11), data recalculated with corrected calibration coefficients
DOI: 10.1594/pangaea.692375
title: Concentrations of chlorophyll-alpha in sea water from the euphotic zone at Station SEPT-94-GN3619940280301210 in the Aegean Sea

description: Samples from 2 l of sea water were filtered through polycarbonate Millipore. The filters were kept deep frozen and analyzed according to Holm-Hansen et al. (Holm-Hansen, O., Lorenzen, C.J., Holmes, R.W., Strickland, J.D.H. 1965. Fluorometric determination of chlorophyll. Journal du Conseil Permanent International Pour l'Exploration de la Mer 30, 3-15).
DOI: 10.1594/pangaea.674105
title: Radiosonde measurements from station Camborne (2006-06)

description: Start location: Denver, Colorado, USA; Distance from radiation site: 30 km
DOI: 10.1594/pangaea.748678
title: Meteorological observations during DREADNOUGHT cruise from Cruising Off Port Royal started at 1759-10-13
DOI: 10.1594/pangaea.784378
title: Laser profiles of sea ice surface roughness during POL-ICE 2007 field campaign from flight POL-ICE07_200703121146
DOI: 10.1594/pangaea.717967
title: Ultra-violet measurements from station Boulder, SURFRAD (2005-10)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-09.
DOI: 10.1594/pangaea.736200
title: Ozone measurements from station Lindenberg (1999-07)
DOI: 10.1594/pangaea.846640
title: (Table 2) Nd isotope results of leach experiments
DOI: 10.1594/pangaea.494520
title: H.W.M. Olbers measurements of air temperature in Bremen from 1803 to 1822

description: We rediscovered a temperature time series from Heinrich W. M. Olbers. Heinrich W. M. Olbers measured in Bremen, Sandstrasse 15, in Germany from 1803 to 1821 three times a day (7 am, 1-2 pm and 10 pm) the temperature at his window of his study, which is up to 16 m above the zero marking at the Weserbrücke. The temperature values from 1814 are missing. We got the temperature values from different sources in the Olbers estate.We calculated the daily mean and digitized it in various plots. A very small trend towards cooling is apparent in the data which might be insignificant. But a clear seasonal trend was identifiable: the late winter and the early spring were becoming warmer, while the summer and early autumn became cooler. The average temperature in Bremen was 8.3606 deg C at that time. Additionally we combined the newly discovered Heinrich W. M. Olbers temperature data and the Heinemann and Bätjer data to see whether there are great differences between these two time series. Although the temperatures of Heinrich W. M. Olbers are in general cooler than the Heinemann and Bätjer data they fit together.
DOI: 10.1594/pangaea.691333
title: Mesozooplankton abundance in waters of the Aegean Sea in March 1994

description: A Folsom splitter has been used for biomass and abundance estimations in 4% formaldehyde buffered sub-samples. A Stempel pipette has been used for subsamples in taxonomic analysis of zooplankton.
DOI: 10.1594/pangaea.718932
title: Other measurements at 10 m from station Bondville (2004-10)
DOI: 10.1594/pangaea.919120
title: Mitochondrial complex I in hypoxia-tolerant marine bivalves exposed to extreme hypoxia

description: Mitochondrial Complex I in hypoxia-tolerant marine bivalves, namely, the blue mussel Mytilus edulis, the Arctic quahog Arctica islandica and the Pacific oyster Crassostrea gigas, exposing them for one or six days to extreme hypoxia (&lt;0.1% O2) followed by one hour of reoxygenation.
DOI: 10.1594/pangaea.750325
title: Meteorological observations during LAMPHITRITE cruise from Coastal to Caribean started at 1776-03-26
DOI: 10.1594/pangaea.736201
title: Expanded measurements from station Lindenberg (1999-07)

description: 99999: No clouds detected
DOI: 10.1594/pangaea.722800
title: Ultra-violet measurements from station Rock Springs (2008-06)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-03.
DOI: 10.1594/pangaea.775036
title: Continuous meteorological observations at Neumayer station (2005-02)
DOI: 10.1594/pangaea.545154
title: Physical oceanography at CTD station Chip_2003-09-13_10, Chipana, Chile
DOI: 10.1594/pangaea.904722
title: Table SM-4: Splice interval table for ODP Site 138-851

description: This is the splice interval table for Site 851 (present day preferred format for presenting the splice).Each row indicates the interval within a core that is included within the revised splice.ANCHOR indicates the core at the top of the splice anchored a the seafloor; TIE indicates where that the core is directly tied to the previous core; APPEND indicates where the core is appended to the previous core.
DOI: 10.1594/pangaea.752532
title: Meteorological observations during TRUSTY cruise from Cadiz to Spithead started at 1795-08-05
DOI: 10.5281/zenodo.11163685
title: Computational Screening of Transition Metal Complexes as Guests in the Ga4L6-12 Nanocage

description: Optimized geometries, scripts, experimental data curated from the literature from complexes, and CSD filtering data for "Computational Screening of Putative Transition Metal Complexes as Guests in the Ga4L6-12 Nanocage."
DOI: 10.1594/pangaea.919156
title: Other measurements at 10 m from station Desert Rock (2020-01)
DOI: 10.1594/pangaea.671433
title: Basic measurements of radiation at station Solar Village (2002-04)
DOI: 10.1594/pangaea.719020
title: Ultra-violet measurements from station Bondville (2006-01)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-09.
DOI: 10.1594/pangaea.717954
title: Ultra-violet measurements from station Boulder, SURFRAD (2005-07)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-09.
DOI: 10.1594/pangaea.748094
title: Hydrography on standard level calculated from water bottle samples of RV Fiolent from 1972 to 1979
DOI: 10.1594/pangaea.691020
title: Mesozooplankton average length during Akademik Kovalevsky cruise AK7/5, Part I

description: Mesozooplankton was sampled by open-closing JUDAY net with a 36 cm ring diameter and mesh size of 0.145 mm. The open-closing mechanism used was the Nansen mechanical lock system allowing nets to be vertically towed through standard depths (0-10, 10-25, 25-50, 50-100, 100-200, 200-500 m) and closed at the upper depth level. Depth of tow was evaluated by wire paid out and the angle of wire inclination. The 10-20 ml samples were preserved in 3-4% buffered formaldehyde and processed on return to the laboratory. All of copepods were identified to genus level, other taxanomic groups - to type, class, order and family levels.
DOI: 10.1594/pangaea.718752
title: Ultra-violet measurements from station Sioux Falls (2007-01)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-03.
DOI: 10.1594/pangaea.917038
title: 1-Hz PPP displacements at GEONET station 0862 during the 2011 Tohoku Mw9.0 earthquake
DOI: 10.1594/pangaea.914461
title: Expanded measurements from Neumayer Station (2019-11)

description: 99999: No clouds detected
DOI: 10.1594/pangaea.722105
title: Other measurements at 10 m from station Goodwin Creek (2008-11)
DOI: 10.1594/pangaea.719081
title: Radiosonde measurements from station Bondville (2007-04)

description: Start location: Lincoln, IL; Distance from radiation site: 82 km; If launch time is exactly 00Z or 12Z, the actual launch time is likely unknown
DOI: 10.1594/pangaea.860572
title: Other measurements at 10 m from station Bondville (2009-10)
DOI: 10.1594/pangaea.744199
title: Physical oceanography during Dana II cruise Dana88/2 to the North Sea
DOI: 10.1594/pangaea.691452
title: (Fig. 11) Distribution of dinoflagellate cysts in Early Cretaceous sediments of DSDP Hole 41-370 in the North Atlantic

description: Species abundance: F = 1-5 %, C = 6-15 %, A = &gt;15 %, - = not present
DOI: 10.1594/pangaea.717929
title: Basic measurements of radiation at station Boulder, SURFRAD (2005-01)
DOI: 10.1594/pangaea.751343
title: Meteorological observations during Princes Louisa cruise from Curacao to Nieuwediep started at 1778-06-30
DOI: 10.1594/pangaea.548874
title: Physical oceanography at CTD station Chan_2003-10-17_16, Chanavallita, Chile
DOI: 10.1594/pangaea.722749
title: Other measurements at 10 m from station Rock Springs (2007-01)
DOI: 10.1594/pangaea.666878
title: (Table 5) Sr-Nd compositions of tephra layers from ODP Hole 180-1109C
DOI: 10.1594/pangaea.719102
title: Other measurements at 10 m from station Bondville (2007-09)
DOI: 10.1594/pangaea.736160
title: Meteorological synoptical observations from station Lindenberg (1998-10)
DOI: 10.1594/pangaea.719652
title: Ultra-violet measurements from station Desert Rock (2004-05)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-08.
DOI: 10.1594/pangaea.494939
title: Physical oceanography during cruise UXXXX09999C_1979
DOI: 10.1594/pangaea.721981
title: Other measurements at 10 m from station Goodwin Creek (2005-06)
DOI: 10.1594/pangaea.739167
title: Pollen profile DOLG5-7, Dolgoe, Belarus

description: The EPD (http://www.europeanpollendatabase.net) accepted species name is given in the parameter comment. This dataset was archived on 2010-05-11 from the EPD database.
DOI: 10.1594/pangaea.494913
title: Physical oceanography during cruise U90XX00040C
DOI: 10.1594/pangaea.495514
title: Water temperature XBT profiles from cruise U32XX80349_1991
DOI: 10.15468/dl.f6yex8
title: Occurrence Download

description: A dataset containing 586 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is one of (Diospyros guianensis (Aubl.) Gürke, Paralea guianensis Aubl., Diospyros paralea Steud.)"
 ]
}

 The dataset includes 586 records from 78 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0031134-240626123714530/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.1594/pangaea.919162
title: Other measurements at 10 m from station Desert Rock (2020-03)
DOI: 10.1594/pangaea.626576
title: Light mineral composition of 0.100-0.050 mm and 0.250-0.100 mm size fractions of sedimentary rocks from Hole VNIIO-1983-81 drilled in the Barents Sea

description: Types of rocks and their ages are given in the special data set; see: doi:10.1594/PANGAEA.626564Method used - binocular counting
DOI: 10.1594/pangaea.739129
title: Pollen profile COOLT, Kulichkovskoye, Ukraine

description: L. Post method.The EPD (http://www.europeanpollendatabase.net) accepted species name is given in the parameter comment. This dataset was archived on 2010-05-11 from the EPD database.
DOI: 10.1594/pangaea.626562
title: Chemical composition of water collected in Hole Grumant-1 drilled in the West Svalbard

description: Types of host rocks and their ages are given in the special data set; see doi:10.1594/PANGAEA.626563
DOI: 10.1594/pangaea.919165
title: Other measurements at 10 m from station Desert Rock (2020-04)
DOI: 10.1594/pangaea.917726
title: Direction and associated error of the ChRM directions from discrete samples of IODP Exp 371 sites
DOI: 10.1594/pangaea.723639
title: Radiosonde measurements from station Southern Great Plains (2002-04)

description: Version 2, 2009-07-02; Launches at irregular time intervals. The radiosonde measurements from station Southern Great Plains are used for Billings and E13
DOI: 10.1594/pangaea.868954
title: Colour reflectance of sediment core COR0503-CL05-37
DOI: 10.1594/pangaea.722122
title: Ultra-violet measurements from station Goodwin Creek (2009-05)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-03.
DOI: 10.1594/pangaea.869580
title: Ultra-violet measurements from station Rock Springs (2013-02)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-03.
DOI: 10.1594/pangaea.663314
title: Oceanography at CTD/bottle station IFREMER_0154
DOI: 10.1594/pangaea.707923
title: (Table 2) Age and oxygen isotope data for bulk carbonate from DSDP Site 72-516
DOI: 10.1594/pangaea.494925
title: Physical oceanography during cruise U90XX00132C
DOI: 10.1594/pangaea.919123
title: Mitochondrial complex IV in hypoxia-tolerant marine bivalves exposed to extreme hypoxia

description: Mitochondrial Complex IV in hypoxia-tolerant marine bivalves, namely, the blue mussel Mytilus edulis, the Arctic quahog Arctica islandica and the Pacific oyster Crassostrea gigas, exposing them for one or six days to extreme hypoxia (&lt;0.1% O2) followed by one hour of reoxygenation.
DOI: 10.1594/pangaea.496076
title: Water temperature MBT profiles from cruise U90X089094M_1989
DOI: 10.1594/pangaea.919124
title: Total phosphatases in hypoxia-tolerant marine bivalves exposed to extreme hypoxia

description: Total phosphatases in hypoxia-tolerant marine bivalves, namely, the blue mussel Mytilus edulis, the Arctic quahog Arctica islandica and the Pacific oyster Crassostrea gigas, exposing them for one or six days to extreme hypoxia (&lt;0.1% O2) followed by one hour of reoxygenation.
DOI: 10.1594/pangaea.919125
title: Serine/threonine protein kinase A (PKA) and protein kinase C (PKC) in hypoxia-tolerant marine bivalves exposed to extreme hypoxia

description: Serine/threonine protein kinase A (PKA) and protein kinase C (PKC) in hypoxia-tolerant marine bivalves, namely, the blue mussel Mytilus edulis, the Arctic quahog Arctica islandica and the Pacific oyster Crassostrea gigas, exposing them for one or six days to extreme hypoxia (&lt;0.1% O2) followed by one hour of reoxygenation.
DOI: 10.1594/pangaea.739751
title: Pollen profile ROB316, Alpi di Robièi, Val Bavona, Switzerland

description: The EPD (http://www.europeanpollendatabase.net) accepted species name is given in the parameter comment. This dataset was archived on 2010-05-11 from the EPD database.
DOI: 10.1594/pangaea.869587
title: Other measurements at 10 m from station Rock Springs (2013-04)
DOI: 10.1594/pangaea.626577
title: Chemical characteristics of bitumen from sedimentary rocks of VNIIO-1983-81 Hole drilled in the Barents Sea

description: Types of rocks and their ages are given in the special data set; see: doi:10.1594/PANGAEA.626564
DOI: 10.1594/pangaea.719579
title: Radiosonde measurements from station Bondville (2003-02)

description: Version 2, 2009-06-15; Start location: Lincoln, IL; Distance from radiation site: 82 km; If launch time is exactly 00Z or 12Z, the actual launch time is likely unknown
DOI: 10.1594/pangaea.721965
title: Ultra-violet measurements from station Goodwin Creek (2005-01)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-03.
DOI: 10.1594/pangaea.719849
title: Ultra-violet measurements from station Desert Rock (2008-01)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-08.
DOI: 10.1594/pangaea.919107
title: Diatom counts in sediment core GR13/L3 from a shallow Arctic pond basin, Kobbefjord, SW Greenland
DOI: 10.1594/pangaea.869577
title: Ultra-violet measurements from station Rock Springs (2013-01)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-03.
DOI: 10.1594/pangaea.919108
title: Diatom counts in sediment core GR13/L4 from a shallow Arctic pond basin, Kobbefjord, SW Greenland
DOI: 10.1594/pangaea.784282
title: Laser profiles of sea ice surface roughness during ARANDA cruise IRIS 2005 from flight IRIS2005_200503151113
DOI: 10.1594/pangaea.869578
title: Other measurements at 10 m from station Rock Springs (2013-01)
DOI: 10.1594/pangaea.739337
title: Pollen profile IVAN5, Ivanovskoye Peat Bog, Russia

description: KOM treatment Erdtman's method.The EPD (http://www.europeanpollendatabase.net) accepted species name is given in the parameter comment. This dataset was archived on 2010-05-11 from the EPD database.
DOI: 10.1594/pangaea.922046
title: Calcium carbonate by coulometry in sediment cores from James Cook cruise JC138

description: Calcium carbonate concentrations measured on CM5015 coulometer at the SEAPORT laboratories (University of Southampton) for the cores JC138-27GC, JC138-28GC, JC138-29GC, JC138-38GC, JC138-49GC and JC138-52GC.
DOI: 10.1594/pangaea.719862
title: Radiosonde measurements from station Desert Rock (2008-04)

description: If launch time is exactly 00Z or 12Z, the actual launch time is likely unknown
DOI: 10.1594/pangaea.750958
title: Meteorological observations during No. 12 cruise from Cap Francois to Bordeaux started at 1788-01-01
DOI: 10.1594/pangaea.922075
title: Autoanalyzer data for Nutrients in pore waters of sediment cores from James Cook cruise JC138

description: Nutrients data (NOX (NO2+NO3) and NH4) in pore waters measured on a AA3 Autoanalyzer.
DOI: 10.1594/pangaea.909613
title: Cloud Chemistry Monitoring at Mt. Brocken, Germany - 1995

description: The liquid water content of clouds (LWC) has been continuously measured using forward scattering of laser beams by cloud droplets with a Particulate Volume Monitor PVM-100 (Gerber Scientific Inc.). This instrument was also used to control an automated „wet-only” sampling unit that opens up and moves a passive string collector (ASRC type) into sampling position when the LWC level exceeds a 25mg/m**3 threshold. The samples were analysed by ion chromatography (DIONEX suppressor, SYKAM pump and conductivity detector, JASCO sampler) for anions ([Cl]-, [NO3]-, [SO4]2-) and cations ([Na]+, [NH4]+, [K]+, [Ca]2+, [Mg]2+), pH and conductivity. The acceptance criteria for ion balance and for conductivity (measured/calculated), respectively, are defined in the Reports 85 (1992) and 102 (1994) of the WMO for all activities within the GAW program and also we did follow rigorously these standard practices. The whole measurement and analytical procedure was laid down in standard operating procedures. Overall data check: Karin Acker
DOI: 10.1594/pangaea.739021
title: Pollen profile BEORV644, Abbaye dOrval, Belgium

description: The EPD (http://www.europeanpollendatabase.net) accepted species name is given in the parameter comment. This dataset was archived on 2010-05-11 from the EPD database.
DOI: 10.1594/pangaea.739844
title: Pollen profile SRE4, Lake Srebarna, Bulgaria

description: Acetolysis method (Erdtman,1966).The EPD (http://www.europeanpollendatabase.net) accepted species name is given in the parameter comment. This dataset was archived on 2010-05-11 from the EPD database.
DOI: 10.1594/pangaea.869596
title: Other measurements at 10 m from station Rock Springs (2013-07)
DOI: 10.1594/pangaea.668828
title: Basic measurements of radiation at station Carpentras (1998-02)
DOI: 10.1594/pangaea.922113
title: Geochemistry by ICP-OES (batch 1) of major cations in sediment cores from James Cook cruise JC138

description: Geochemical data for major cations obtained by ICP-OES, batch 1.
DOI: 10.1594/pangaea.718173
title: Ultra-violet measurements from station Boulder, SURFRAD (2007-11)

description: UV-b values were originally given in mW/m² and then erroneously imported in W/m² using the same numbers. The numbers have been corrected (divided by 1000) on 2017-02-09.
DOI: 10.1594/pangaea.495567
title: Water temperature MBT profiles from cruise U7426228M_1951
DOI: 10.1594/pangaea.680459
title: Other measurements at 10 m from station Payerne (2001-11)
DOI: 10.1594/pangaea.922120
title: Geochemistry by ICP-MS (batch 2) of minor cations in sediment cores from James Cook cruise JC138

description: Geochemical data for minor cations obtained by ICP-MS, batch 2.
DOI: 10.1594/pangaea.769802
title: Visual core description and core images of Hole 325-M0051A
DOI: 10.1594/pangaea.772445
title: Hydrochemistry measured on water bottle samples during cruise NP26

description: No original source is given by the authors of the atlas.
DOI: 10.1594/pangaea.497851
title: Physical oceanography from BT during cruise U58X001051B_1942
DOI: 10.1594/pangaea.494659
title: Physical oceanography during cruise K06XXXXXXXC
DOI: 10.1594/pangaea.841853
title: Basic measurements of radiation at station Darwin (2002-06)

description: Version 2, 2015-01-26
DOI: 10.1594/pangaea.739638
title: Pollen profile PALAS_A, Palasiny, Czech Republic

description: The EPD (http://www.europeanpollendatabase.net) accepted species name is given in the parameter comment. This dataset was archived on 2010-05-11 from the EPD database.