Searched for: subject:"isotope"
(1 - 20 of 74)

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Bezemer, K. (author), McLennan, L. (author), Hessels, R. (author), Schoorl, J. (author), van den Elshout, J.J.M.H. (author), van der Heijden, A.E.D.M. (author), Hulsbergen, A. (author), Koeberg, M. (author), Busby, T. (author), Yevdokimov, A. (author), Rijke, E. (author), Schoenmakers, P. (author), Smith, J. (author), Oxley, J. (author), van Asten, A. (author)
In this follow-up study the collaboration between two research groups from the USA and the Netherlands was continued to expand the framework of chemical attribution for the homemade explosive erythritol tetranitrate (ETN). Isotope ratio mass spectrometry (IRMS) analysis was performed to predict possible links between ETN samples and its...
article 2020
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Eggenkamp, H.G.M. (author), Louvat, P. (author), Agrinier, P. (author), Bonifacie, M. (author), Bekker, A. (author), Krupenik, V. (author), Griffioen, J. (author), Horita, J. (author), Brocks, J.J. (author), Bagheri, R. (author)
We determined the chlorine and bromine isotope compositions of 83 halite samples from nine different geological periods between the Orosirian and the present in order to study the secular Cl and Br isotope variations in the ocean during the last 2 billion years. Relatively large Cl (-0.24 to +0.51%e vs. SMOC) and Br ( —0.24 to +1.08%e vs. SMOB)...
article 2019
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van de Schootbrugge, B. (author), Houben, A.J.P. (author), Ercan, F.E.Z. (author), Verreussel, R. (author), Kerstholt, S. (author), Janssen, N.M.M. (author), Nikitenko, B. (author), Suan, G. (author)
The Toarcian Oceanic Anoxic Event (T-OAE, c. 182 Ma) represents a major perturbation of the carbon cycle marked by widespread black shale deposition. Consequently, the onset of the T-OAE has been linked to the combined effects of global warming, high productivity, basin restriction and salinity stratification. However, the processes that led to...
article 2019
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Schout, G. (author), Griffioen, J. (author), Majid Hassanizadeh, S. (author), Cardon de Lichtbuer, G. (author), Hartog, N. (author)
Methane leakage caused by well integrity failure was assessed at 28 abandoned gas wells and 1 oil well in the Netherlands, which have been plugged, cut and buried to below the ground surface (≥3 mbgl). At each location, methane concentrations were thoroughly scanned at the surface. A static chamber setup was used to measure methane flow rates...
article 2019
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Eggenkamp, H.G.M. (author), Louvat, P. (author), Griffioen, J. (author), Agrinier, P. (author)
article 2019
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Bijl, P.K. (author), Houben, A.J.P. (author), Bruls, A. (author), Pross, J. (author), Sangiorgi, F. (author)
There is growing interest in the scientific community in reconstructing the paleoceanography of the Southern Ocean during the Oligocene-Miocene because these time intervals experienced atmospheric CO2 concentrations with relevance to our future. However, it has remained notoriously difficult to put the sedimentary archives used in these efforts...
article 2018
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Schout, G. (author), Hartog, N. (author), Hassanizadeh, S.M. (author), Griffioen, J. (author)
Blowouts present a small but genuine risk when drilling into the deep subsurface and can have an immediate and significant impact on the surrounding environment. Nevertheless, studies that document their long-term impact are scarce. In 1965, a catastrophic underground blowout occurred during the drilling of a gas well in The Netherlands, which...
article 2017
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Raaphorst, R.M. (author), Savolainen, H. (author), Cantore, M. (author), van de Steeg, E. (author), van Waarde, A. (author), Colabufo, N.A. (author), Elsinga, P.H. (author), Lammertsma, A.A. (author), Windhorst, A.D. (author), Luurtsema, G. (author)
Positron emission tomography (PET) imaging of P-glycoprotein (P-gp) in the blood-brain barrier can be important in neurological diseases where P-gp is affected, such as Alzheimer’s disease. Radiotracers used in the imaging studies are present at very small, nanomolar, concentration, whereas in vitro assays where these tracers are characterized,...
article 2017
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Bezemer, K.D.B. (author), Koeberg, M. (author), van der Heijden, A.E.D.M. (author), van Driel, C.A. (author), Blaga, C. (author), Bruinsma, J. (author), van Asten, A.C. (author)
Studying links between triacetone triperoxide (TATP) samples from crime scenes and suspects can assist in criminal investigations. Isotope ratio mass spectrometry (IRMS) and gas chromatography (GC)-IRMS were used to measure the isotopic compositions of TATP and its precursors acetone and hydrogen peroxide. In total, 31 TATP samples were...
article 2016
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Goldberg, T. (author), Poulton, S.W. (author), Wagner, T. (author), Kolonic, S.F. (author), Rehkämper, M. (author)
During the Cretaceous greenhouse, episodes of widespread ocean deoxygenation were associated with globally occurring events of black shale deposition. Possibly the most pronounced of these oceanic anoxic events (OAE's) was the Cenomanian-Turonian OAE2 (~94 Ma). However, although certain redox sensitive trace metals tend to be preferentially...
article 2016
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Brust, H. (author), Koeberg, M. (author), van der Heijden, A. (author), Wiarda, W. (author), Mügler, I. (author), Schrader, M. (author), Vivo-Truyols, G. (author), Schoenmakers, P. (author), van Asten, A. (author)
Ammonium nitrate (AN) is frequently encountered in explosives in forensic casework. It is widely available as fertilizer and easy to implement in explosive devices, for example by mixing it with a fuel. Forensic profiling methods to determine whether material found on a crime scene and material retrieved from a suspect arise from the same source...
article 2015
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van Lint, C.L. (author), van der Boog, P.J.M. (author), Romijn, F.P.H.T.M. (author), Schenk, P.W. (author), van Dijk, S. (author), Rövekamp, T.J.M. (author), Kessler, A. (author), Siekmann, L. (author), Rabelink, T.J. (author), Cobbaert, C.M. (author)
Background: The StatSensor® Xpress-i™, a point-of-care system for blood creatinine measurement, offers patients the possibility of self-monitoring creatinine. In this study, the analytical performance of the StatSensor® for both detecting current renal function and monitoring renal (dys)function in kidney transplant patients was examined....
article 2015
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van Uhm, J.I.M. (author), Visser, G.W.M. (author), van der Schans, M.J. (author), Geldof, A.A. (author), Meuleman, E.J.H. (author), Nieuwenhuijzen, J.A. (author)
Background: Botulinum neurotoxin A (BoNT-A) is a highly neurotoxic drug and frequently used in patients. Knowledge on the optimal way of administration of BoNT-A and its subsequent distribution is still rather limited. An accurate method for monitoring these processes might be the use of radiolabelled BoNT-A. In this paper, we report our...
article 2015
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Mertens, J. (author), Brachert, L. (author), Desagher, D. (author), Thielens, M.L. (author), Khakharia, P.M. (author), Goetheer, E.L.V. (author), Schaber, K. (author)
Recently, studies have appeared pointing out that aerosols can dominate the total amine emission from amine based PCCC pilot plant scale installations. For the design of countermeasure types (upstream or downstream of the PCCC installation), it is crucial to have an idea of the aerosol size distribution and numbers entering or leaving the...
article 2014
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Douglas, P.M.J. (author), Affek, H.P. (author), Ivany, L.C. (author), Houben, A.J.P. (author), Sijp, W.P. (author), Sluijs, A. (author), Schouten, S. (author), Pagani, M. (author)
Paleoclimate studies suggest that increased global warmth during the Eocene epoch was greatly amplified at high latitudes, a state that climate models cannot fully reproduce. However, proxy estimates of Eocene near-Antarctic sea surface temperatures (SSTs) have produced widely divergent results at similar latitudes, with SSTs above 20 °C in the...
article 2014
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Berg, S. (author), Leng, M.J. (author), Kendrick, C.P. (author), Cremer, H. (author), Wagner, B. (author)
Organic carbon occluded in diatom silica is assumed to be protected from degradation in the sediment. δ13C from diatom carbon (δ13C(diatom)) therefore potentially provides a signal of conditions during diatom growth. However, there have been few studies based on δ13C(diatom). Numerous variables can influence δ13C of organic matter in the marine...
article 2013
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Kleinnijenhuis, A.J. (author), Staal, Y.C.M. (author), Duistermaat, E. (author), Engel, R. (author), Woutersen, R.A. (author)
Formaldehyde (FA) is suspected of being associated with the development of leukemia. An inhalation experiment with FA was performed in rats to study whether FA can enter the blood and could thus cause systemic toxicity in remote tissues such as the bone marrow. Therefore, a sophisticated analytical method was developed to detect blood...
article 2013
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Zhang, Y.C. (author), Slomp, C.P. (author), Broers, H.P. (author), Bostick, B. (author), Passier, H.F. (author), Böttcher, M.E. (author), Omoregie, E.O. (author), Lloyd, J.R. (author), Polya, D.A. (author), van Cappellen, P. (author)
Denitrification driven by pyrite oxidation can play a major role in the removal of nitrate from groundwater systems. As yet, limited information is available on the interactions between the micro-organisms and aqueous and mineral phases in aquifers where pyrite oxidation is occurring. In this study, we examine the groundwater and sediment...
article 2012
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Wijte, D. (author), van Baar, B.L.M. (author), Heck, A.J.R. (author), Altelaar, A.F.M. (author)
To enhance target production from biocatalysts, it is necessary to thoroughly understand the molecular mechanisms involved in production, degradation, and, importantly, adaptation to the required environment. One such bacterium with high potential for biocatalysis is the solvent-tolerant bacteria Pseudomonas putida S12, which, among others, is...
article 2011
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Cremer, H. (author), Bunnik, F.P.M. (author), Donders, T.H. (author), Hoek, W.Z. (author), Koolen-Eekhout, M. (author), Koolmees, H.H. (author), Lavooi, E. (author), TNO Bouw en Ondergrond (author)
A 400-year sediment record from an 18 m deep scour hole lake (Haarsteegse Wiel) near the Meuse River in the Netherlands was investigated for past changes in water quality, flooding frequency and landscape change using geophysical, geochemical and micropaleontological information. The results are highly significant for determining long-term...
article 2010
Searched for: subject:"isotope"
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