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  • 1
    Publication Date: 2023-09-13
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Between 1973 and 1994, 15 samples of CI chondrites were analyzed by neutron activation analysis at the Max‐Planck‐Institute for Chemistry, Department of Cosmochemistry in Mainz, Germany. The analyses comprise nine Orgueil samples and three samples of Ivuna, two of Alais and one of Tonk. Samples came from various sources and had masses between 5 and 600 mg. Most data are published here for the first time. The results for the nine Orgueil samples demonstrate the essentially homogeneous chemical composition of Orgueil at a level of a few milligrams. The analytical results of Ivuna, Alais, and Tonk agree, with only few exceptions, with the results of Orgueil analyses. All samples agree within ±3% in their contents of Sc, Ir, Cr, Fe, Co, Zn, and Se. The elements Sc and Ir represent the refractory component; Cr, Fe, and Co the main component; and Zn and Se the volatile component. Thus, in all CI chondrites there are essentially the same fractions of the fundamental cosmochemical components. The essentially identical chemical composition of all samples shows that their water contents are constant at about 20 ± 5 wt%. There is excellent agreement between the data listed here with data reported in the relevant literature. There is no doubt that the CI composition is a well‐defined entity, which is thought to represent the non‐gaseous compositions of the solar nebula and the photosphere of the Sun. In addition, we conclude that the recently proposed new CI chondritic chlorine and Br values are too low, when compared to earlier measurements.〈/p〉
    Keywords: ddc:551.9 ; CI chondrites ; composition ; chlorine ; bromine ; neutron activation analysis
    Language: English
    Type: doc-type:article
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  • 2
    Publication Date: 2023-05-12
    Keywords: Iridium; LATITUDE; LONGITUDE; Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS); Palladium; Platinum; Rock type; Rubidium; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 3
    Publication Date: 2024-01-09
    Keywords: 153-920D; Aluminium oxide; Calcium oxide; Chromium; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Instrumental neutron activation analysis (INAA) (Reimann et al., 1998); Iridium; Iron oxide, Fe2O3; Joides Resolution; Leg153; Magnesium oxide; Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS); Nickel; Ocean Drilling Program; ODP; Palladium; Platinum; Rock type; Rubidium; Sample code/label; Silicon dioxide; South Atlantic Ocean; Sulfide; Sulfur, total; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 77 data points
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  • 4
    Publication Date: 2024-01-09
    Keywords: 147-895D; Aluminium oxide; Calcium oxide; Chromium; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Iridium; Iron oxide, Fe2O3; Joides Resolution; Leg147; Magnesium oxide; Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS); Nickel; North Pacific Ocean; Ocean Drilling Program; ODP; Palladium; Platinum; Rock type; Rubidium; Sample code/label; Silicon dioxide; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 77 data points
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  • 5
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    Unknown
    PANGAEA
    In:  Supplement to: Rehkämper, Mark; Halliday, Alex N; Alt, Jeffrey C; Fitton, J Godfrey; Zipfel, J; Takazawa, Eiichi (1999): Non-chondritic platinum-group element ratios in oceanic mantle lithosphere: petrogenetic signature of melt percolation? Earth and Planetary Science Letters, 172(1-2), 65-81, https://doi.org/10.1016/S0012-821X(99)00193-4
    Publication Date: 2024-01-09
    Description: The concentrations of the platinum-group elements (PGE) Ir, Ru, Pt and Pd were determined in 11 abyssal peridotites from ODP Sites 895 and 920, as well in six ultramafic rocks from the Horoman peridotite body, Japan, which is generally thought to represent former asthenospheric mantle. Individual oceanic peridotites from ODP drill cores are characterized by variable absolute and relative PGE abundances, but the average PGE concentrations of both ODP suites are very similar. This indicates that the distribution of the noble metals in the mantle is characterized by small-scale heterogeneity and large-scale homogeneity. The mean Ru/Ir and Pt/Ir ratios of all ODP peridotites are within 15% and 3%, respectively, of CI-chondritic values. These results are consistent with models that advocate that a late veneer of chondritic material provided the present PGE budget of the silicate Earth. The data are not reconcilable with the addition of a significant amount of differentiated outer core material to the upper mantle. Furthermore, the results of petrogenetic model calculations indicate that the addition of sulfides derived from percolating magmas may be responsible for the variable and generally suprachondritic Pd/Ir ratios observed in abyssal peridotites. Ultramafic rocks from the Horoman peridotite have PGE signatures distinct from abyssal peridotites: Pt/Ir and Pd/Ir are correlated with lithophile element concentrations such that the most fertile lherzolites are characterized by non-primitive PGE ratios. This indicates that processes more complex than simple in-situ melt extraction are required to produce the geochemical systematics, if the Horoman peridotite formed from asthenospheric mantle with chondritic relative PGE abundances. In this case, the PGE results can be explained by melt depletion accompanied or followed by mixing of depleted residues with sulfides, with or without the addition of basaltic melt.
    Keywords: 147-895D; 153-920D; DRILL; Drilling/drill rig; Joides Resolution; Leg147; Leg153; North Pacific Ocean; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
    ISSN: 1432-1440
    Keywords: Cardiotoxicity of contrast media ; Angiocardiography ; Calcium addition to ionic contrast media ; Metrizamide ; Kardiale Nebenwirkungen von Kontrastmitteln ; Kalziumzusatz zu ionischen Kontrastmitteln ; Metrizamid ; Angiocardiographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer klinischen Vergleichsstudie wurde überprüft, inwieweit die kardialen Nebenwirkungen der Angiokardiographie durch Zusatz von Kalzium zum üblicherweise verwandten Diatrizoat (Urografin 76%) und Verwendung von nichtionischem Metrizamid (Amipaque) reduziert werden können. Fünfzehn Patienten wurden hierzu unter randomisierten Bedingungen mit Diatrizoat, mit und ohne Kalziumzusatz (11,3 mmol/l), und Metrizamid (320 mg/ml Jod), in jeweils einer Untersuchung, links und rechts koronarographiert und mit Diatrizoat sowie Metrizamid zweimalig lävographiert. Im Rahmen der selektiven, links- und rechtskoronaren Injektionen bewirkt der Kalzium-Zusatz bereits eine deutliche Abschwächung der bekannten kardiodepressiven Wirkung von Diatrizoat: Der linksventrikuläre Spitzendruck fällt statt im Mittel um 30±11% (einfache Standardabweichung) um lediglich 23±12% gegenüber dem Ausgangswert ab, dP/dtmax statt um 31±15% um lediglich 20±10%. Im paarweisen Vergleich der Injektionsreaktionen mit und ohne zugesetztem Kalzium, zeigt sich der Unterschied als schwach signifikant (p〈0,05). Bei Verwendung des nichtionischen Metrizamids zeigen sich die kardiodepressiven Nebenwirkungen in noch geringerer Ausprägung. Die Druckminderung im linken Ventrikel beträgt hier nur 13±10%, die Kontraktilität fällt lediglich um 7±7% ab (bezogen auf einen mittleren Ausgangswert). Der Unterschied zu den Reaktionen unter Diatrizoat allein ist mitp〈0,001 hochsignifikant. Die unter Diatrizoat zum Teil ausgeprägte Frequenzverlangsamung zeigt sich unverändert auch bei Zusatz von Kalzium. Bei Verwendung von Metrizamid ist sie nur angedeutet. Bei der linksventrikulären Injektion zeigen sich deutliche Unterschiede in der Phase peripherer Vasodilatation. Während es hier unter Diatrizoat zu einem deutlichen Druckabfall kommt, ist dieser unter Metrizamid, dem Kontrastmittel mit wesentlich niedrigerer Osmolarität, kaum nachzuweisen (p〈0,001). Da unter Metrizamid die unerwünschten, kardialen Nebenwirkungen, wie Senkung des Perfusionsdrucks, gering sind, erweist es sich als besonders geeignet für die Untersuchung von Risikopatienten. Hinsichtlich seiner geringen Nebenwirkungsrate übertrifft es auch Diatrizoat in Kombination mit Kalzium.
    Notes: Summary Cardiodepressive side effects of angiocardiography can be reduced by using non-ionic metrizamide (Amipaque) or adding calcium to diatrizoate (Urografin 76%). In 15 patients with coronary artery disease undergoing heart catheterization, we compared cardiac side effects of coronary angiography and left ventricular angiography using metrizamide and diatrizoate with and without additional calcium (11,3 mmol/l) as contrast media under randomized conditions. In selective intracoronary injection with diatrizoate alone, peak left ventricular pressure and contractility (dP/dtmax) showed a fall of 30±11% and 31±15% (n=33 injections). Using diatrizoate with added calcium (11,3 mmol/l), the fall was only 23±12% and 20±10% respectively (n=31 injections). With metrizamide (n=32 injections) cardiac side effects are even less and the decrease in pressure and contractility only 13±10% and 7±7% respectively, which its highly significant (p〈0,001) compared with the effect of diatrizoate. The heartrate slowing, not essentially altered by calcium addition, was minimal using non-ionic metrizamide. In left ventricular angiography, the pressure fall in the late phase after injection of diatrizoate, caused by decreased peripheral vascular resistance (vasodilation), was lacking when injecting metrizamide (p〈0,001). Metrizamide has even less cardiodepressive side effects than diatrizoate with additional calcium when used in angiocardiography and seems to be suitable particularly for the evaluation of high risk patients.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 111 (1992), S. 24-36 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Upper mantle plagioclase+spinel- and spinel-peridotite xenoliths occur in basanitic and tephritic lavas of the 2.7 my to Recent Mt. Melbourne Volcanic Field (Antarctica). This field belongs to the Cenozoic McMurdo volcanic group which is located between the deep western trough of the Ross Sea rift system and the uplifted rift shoulder of the Transantarctic Mountains. Our samples cover the transition zone between rift and shoulder. We examined texture and composition of plagioclase+spinel and normal spinel peridotites and determined temperatures and pressures of formation using the internally consistent Ca-ol/cpx and 2px-thermobarometer of Köhler and Brey (1990) and Brey and Köhler (1990). Distinct calcium distribution patterns in olivines correspond to three different petrographic textures: type ELZ have equigranular textures, and low calcium concentrations of 60 ppm in the olivine cores which are strongly zoned to 200 ppm in their rims. Type PLH are protogranular to porphyroclastic and have low and homogeneous calcium contents in the range of 120 to 200 ppm. Type EHH peridotites are equigranular and have olivines with high and homogeneous calcium values of 467–485 ppm. The application of the 2 px-thermometer give rim temperatures of 800 to 860 °C for Type ELZ, 900 to 1080 °C for type PLH and 1030 to 1050 °C for type EHH. Pressures of 13 to 17 kb calculated with the Ca-ol/epx-barometer for EHH peridotites are consistent with the Ross Rift geotherm. For the other two types, this barometer yields unreasonable high pressures exceeding 30 kb for both, plagioclase-bearing and ‘normal’ spinel-peridotites. This indicates disequilibrium and continued calcium-loss from the olivines during cooling below the closure temperature for the 2 px-thermometer. Inversion of the Ca-in-olivine-barometer into a thermometer and application to core compositions of ELZ olivines (60 ppm) suggests that cooling occurred to temperatures of ca. 580 °C. Based on petrographical and geothermobarometric results and diffusion arguments, a four stage model is developed for the evolution of the upper mantle beneath the margin of the Ross Rift: (1) adiabatic uplift into the plagioclase/spinel-peridotile field; (2) subsequent cooling below the blocking temperature (800 °C) of the 2 px-thermometer to about 600 °C as indicated by low Ca in olivine cores; followed by (3) reheating to 760 °C as suggested by zonation to high calcium concentrations of up to 200 ppm in olivine rims. Calcium concentrations of up to 800 ppm were measured in one ELZ-olivine in the outermost rim (10 μm) reflecting (4) a last heating event during transport and ascent in the basanitic host magma. Timing for the latter two stages has been roughly calculated from Ca-diffusivities in olivine. A minimum duration of 1200 to a few million years is indicated for stage 3 and 90 h to 22–23 days for stage 4, respectively. This timing of events correlates to increased mantle temperatures for the duration of magmatic activity of the Mt. Melbourne Volcanic Field and the short-term transport in host magmas. Our results also indicate that anomalous shallow mantle exists at the transition from the Ross Rift into the uplifted Transantarctic Mountains.
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  • 8
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Gültigkeit des diastolischen Druck-Zeit-Index (DPTI) als ein Maß für die Abschätzung des myokardialen O2-Angebots und des Tension-Time-Index (TTI) als ein Maß für den O2-Bedarf ist an 10 intakten Hunden geprüft worden. wir analysierten 158 Steady-States bei maximaler Variation von Hämodynamik und O2-Verbrauch. Für jedes Steady-State wurden 23 hämodynamische Größen ausgewertet. Die Myokarddurchblutung (MBF) wurde direkt über einen Druckdifferenzkatheter im Sinus coronarius gemessen. Der O2-Verbrauch (MVO2) wurde durch Applikation von Katecholaminen, Atropin, negativ und positiv inotropen Substanzen und Hypo- und Hypervolämie variiert. Zwischen den direkten Messungen von O2-Angebot und O2-Bedarf fand sich eine enge Beziehung über einen weiten Testbereich (r=0.93), dagegen zeigte sich keine signifikante Korrelation zwischen dem Verhältnis von DPTI zu TTI und dem Verhältnis von O2-Angebot zu O2-Bedarf (direkt gemessen). Bei intakter metabolischer Regulation der Koronardurchblutung ergibt sich keine enge Beziehung zwischen mittlerem diastolischen Aortendruck und Koronardurchblutung über den gesamten Testbereich (r=0,45); diese fehlende Beziehung erklärt mit, warum der DPTI keine Korrelation zum direkt gemessenen O2-Angebot zeigt (r=0,34). Der Tension-Time-Index weist unter normaler und mäßiger Inotropiestimulation eine enge Beziehung zum myokardialen O2-Verbrauch auf (r=0,96), dagegen ergibt sich unter stark positiver Inotropiestimulation keine signifikante Beziehung mehr (r=0,39). Unsere Befunde zeigen, daß das Verhältnis von DPTI zu TTI mit größter Vorsicht interpretiert werden sollte, falls es allgemein als Maß für die Güte des myokardialen O2-Angebotes verwendet wird.
    Notes: Summary The validity of the diastolic pressure time index (DPTI) as an estimate of myocardial O2 supply and tension time index (TTI) as an estimate of O2 demand has been examined in 10 closed-chest anesthetized dogs. We analyzed 158 steady states including maximal variation of hemodynamics and O2 consumption. For each steady state 23 hemodynamic variables were calculated. Myocardial blood flow (MBF) was directly measured in the coronary sinus with a differential pressure catheter. Oxygen consumption (MVO2) was varied by application of catecholamines, atropine, negative and positive inotropic drugs and hypo- and hypervolemia. There was a close relationship between direct measurements of O2 supply and O2 demand over a wide range of testing (r=0.93), but there was no significant correlation between the ratio of DPTI/TTI and the ratio of O2 supply/O2 demand (directly measured). With intact metabolic regulation of coronary blood flow there is no close correlation of mean diastolic aortic pressure to coronary blood flow (r=0.45) over the entire tested range, which is one reason why the DPTI does not show a correlation to the direct measurement of O2 supply (r=0.34). The tension time index bears a close relationship to myocardial oxygen consumption only under normal and moderate stimulation of inotropism (r=0.96), but there is no significant correlation under high positive inotropic stimulation (r=0.39). Our findings indicate that the ratio of DPTI/TTI should be interpreted with great care if it is generally used as an indicator of the adequacy of myocardial O2 supply.
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  • 9
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Einfache, klinisch einsetzbare Verfahren zur Durchblutungsmessung im Koronarsinus — die kontinuierliche lokale Thermodilution (LTD) sowie drei Blutgeschwindigkeitsmeßsonden nach dem Druckdifferenzprinzip (DD), dem Ultraschall-Doppler-Prinzip (US) und dem Elektromagnetischen Prinzip (EMF)-wurden an 15 narkotisierten Hunden mit linksventrikulären Gewichten um 200 g auf ihre Meßgenauigkeit untersucht. LTD, DD, US und EMF wurden in jedem Experiment in zwei Testanordnungen eingesetzt: 1. In einem Koronarsinus-Jugularvenen-Bypass. In dieser Testanordnung standen vier Referenzmeßverfahren zur Bestimmung der Myokarddurchblutung (MBF) zur Verfügung. 2. In einer kliniknahen Einsatzform, ohne Bypass. In dieser Anordnung konnten zwei Referenzverfahren eingesetzt werden. Bei Einsatzform 1 wurde für alle Verfahren (LTD, US, DD) eine gute Meßgenauigkeit festgestellt. In der kliniknahen Einsatzform 2 ist die Meßgenauigkeit der LTD soweit reduziert, daß keine exakten Aussagen über MBF und abgeleitete Größen zu erhalten sind. Die untersuchten Geschwindigkeitsmeßsonden DD und US gaben in der kliniknahen Einsatzform keine Korrelation zu den Referenzmethoden. Das verwendete elektromagnetische Tipflowmeter war beim Einsatz im Koronarsinus wegen der Myokardpotentialstörungen unbrauchbar.
    Notes: Summary The measurement accuracy of clinically applicable methods for blood flow measurement in coronary sinus — continuous local thermodilution (LTD), differential pressure (DP), ultrasonic Doppler (US) and the electromagnetic flow measurement method (EMF) — was examined in 15 anaesthetized closed chest dogs with left ventricle weights between 150 and 200 g. The LTD, DP, US and the EMF were examined in each experiment in the two following arrangements. 1. In coronary sinus — left jugular vein by-pass: This arrangement allowed four reference methods for measurement of coronary sinus blood flow (CBF). 2. In “clinical” position, without by-pass, which allowed two reference methods for CBF measurements. The results on the measurement accuracy of the LTD, DP and US are, depending on the measurement arrangement, contradictory. In the by-pass arrangement 1 there was observed a good agreement of the LTD, DP and US CBF values with the reference values. In the “clinical” position, without by-pass 2 the measurement accuracy of LTD was not sufficient forexact measurement of CBF and derived parameters. The examined velocity tip flow probes (US, DP) gave no correlation with the reference methods. US and DP are even for semiquantitative estimation of CBF unsuitable. The EMF tip flow probe was for the CBF measurement unsuitable, because of disturbance by the electrical activity of myocardium.
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  • 10
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Verhältnis von DPTI/STTI zur Abschätzung der myokardialen O2-Versorgung und die Voraussage der Myokarddurchblutung (MBF) über den diastolischen Druck-Zeit-Index (DPTI) und andere Indizes sind an intakten Hunden geprüft worden. Wir analysierten 89 Steady-states bei maximaler Variation der Determinanten von DPTI und STTI. Die MBF wurde über einen Druckdifferenzkatheter im Sinus coronarius gemessen. Alle Experimente erfolgten bei maximaler Koronardilatation (Dipyridamol). Für breite Variationen von Hämodynamik und MBF kamen latation (Dipyridamol). Für breite Variationen von Hämodynamik und MBF kamen ein intraaortaler Sperrballon, Inotropiestimulation, β-Blockade, Hypo- und Hypervolämie, Elektrostimulation und Hämodilution zum Einsatz. Dabei wurden bewußt klinisch relevante Bilder — wie eine tachykarde Herzinsuffizienz bei erschöpfter Koronarreserve — simuliert. Als Kontrollen einer ausreichenden O2-Versorgung dienten koronarvenöse O2-Sättigung, Elektrokardiographie, Ventrikelfunktion Sektionsergebnis und Ödembildung. Alle Indizes zeigen eine schwache Korrelation zur MBF. Für DPTI errechnet sich ein r von 0,60. Bei Auswertung der Originaldaten vonBuckberg (1) erhalten wir ein analoges Ergebnis (r=0,65) für die Korrelation von DPTI zur subendokardialen Durchblutung. Die beste Korrelation zeigt die Differenz zwischen mittlerem diastolischem Aortendruck und mittlerem diastolischem Ventrikeldruck (r=0,66) ohne Bezug zur Diastolendauer. Danach ist die Diastolendauer in Abweichung von der theoretischen Erwartung keine praktisch wichtige Determinante der MBF. Die alten und auch die neuen kritischen Grenzwerte für DPTI/STTI wurden bei un ohne Gefahren für das Myokard häufig weit unterschritten. Die Aussagekraft des Quotienten scheint demnach stark limitiert zu sein.
    Notes: Summary The DPTI/STTI ratio as an estimate of the myocardial O2 supply/demand ratio and the prediction of myocardial blood flow (MBF) by the diastolic pressure time index (DPTI) and other indices have been examined in intact anesthetized dogs. We analyzed 89 steady states including maximal alterations of the variables determining DPTI and STTI. Myocardial blood flow was directly measured in the coronary sinus with a differential pressure catheter. All experiments were carried out under maximal coronary dilation obtained by application of dipyridamol. Hemodynamics and MBF were varied by use of pressure loading, β-stimulation and β-blockade, hypo- and hypervolemia, electrical stimulation and hemodilution. Hemodynamic variations included clinically significant situations such as tachycardiac heart failure based on exhausted coronary vascular reserve and severe anemia. Parameters of sufficient myocardial O2 supply were coronary venous O2 saturation, precordial Ecg, hemodynamic evaluation of myocardial performance, result of autopsy and determination of the wet and dry weight ratio. All tested parameters show a poor correlation for prediction of MBF. Correlation coefficient for DPTI is r=0.60. Using the primary data ofBuckberg (1) we obtained similar results for the correlation of DPTI to subendocardial blood flow measured with microspheres (r=0.65). The highest r (0.66) was found in our data for the difference between mean diastolic aortic pressure and mean left ventricular diastolic pressure without regard to diastolic duration. Therefore, in contrast to theoretical expectation, diastolic duration is not a practically important determinant and of MBF. A number of DPTI/STTI ratios fell far below the critical values reported in the literature, but they were never associated with the occurrence of subendocardial ischemia, infarction, depressed cardiac performance or myocardial edema
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