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Clemmensen FK, Areskeviciute A, Lund EL, Roos P. Variably protease-sensitive prionopathy with methionine homozygosity at codon 129 in the prion protein gene. BMJ Case Rep 2024; 17:e258199. [PMID: 38388201 PMCID: PMC10884235 DOI: 10.1136/bcr-2023-258199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2024] Open
Abstract
Variably protease-sensitive prionopathy (VPSPr) is a recently characterised rare subtype of sporadic prion disease, mainly affecting individuals with valine homozygosity at codon 129 in the prion protein gene, with only seven methionine homozygote cases reported to date. This case presents clinical, neuropathological and biochemical features of the eighth VPSPr case worldwide with methionine homozygosity at codon 129 and compares the features with the formerly presented cases.The patient, a woman in her 70s, presented with cognitive decline, impaired balance and frequent falls. Medical history and clinical presentation were suggestive of a rapidly progressive dementia disorder. MRI showed bilateral thalamic hyperintensity. Cerebrospinal fluid real-time quaking-induced conversion was negative, and the electroencephalogram was unremarkable. The diagnosis was established through post-mortem pathological examinations. VPSPr should be suspected in rapidly progressive dementia lacking typical features or paraclinical results of protein misfolding diseases.
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Affiliation(s)
- Frederikke Kragh Clemmensen
- Danish Dementia Research Centre, Department of Neurology, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Ausrine Areskeviciute
- Danish Reference Centre for Prion Disease, Department of Pathology, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Eva Løbner Lund
- Danish Reference Centre for Prion Disease, Department of Pathology, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Peter Roos
- Danish Dementia Research Centre, Department of Neurology, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
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Toft A, Sjödin S, Simonsen AH, Ejlerskov P, Roos P, Musaeus CS, Henriksen EE, Nielsen TT, Brinkmalm A, Blennow K, Zetterberg H, Nielsen JE. Endo-lysosomal protein concentrations in CSF from patients with frontotemporal dementia caused by CHMP2B mutation. Alzheimers Dement (Amst) 2023; 15:e12402. [PMID: 36815874 PMCID: PMC9936136 DOI: 10.1002/dad2.12402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 01/02/2023] [Accepted: 01/12/2023] [Indexed: 02/19/2023]
Abstract
Introduction Increasing evidence implicates proteostatic dysfunction as an early event in the development of frontotemporal dementia (FTD). This study aimed to explore potential cerebrospinal fluid (CSF) biomarkers associated with the proteolytic systems in genetic FTD caused by CHMP2B mutation. Methods Combining solid-phase extraction and parallel reaction monitoring mass spectrometry, a panel of 47 peptides derived from 20 proteins was analyzed in CSF from 31 members of the Danish CHMP2B-FTD family. Results Compared with family controls, mutation carriers had significantly higher levels of complement C9, lysozyme and transcobalamin II, and lower levels of ubiquitin, cathepsin B, and amyloid precursor protein. Discussion Lower CSF ubiquitin concentrations in CHMP2B mutation carriers indicate that ubiquitin levels relate to the specific disease pathology, rather than all-cause neurodegeneration. Increased lysozyme and complement proteins may indicate innate immune activation. Altered levels of amyloid precursor protein and cathepsins have previously been associated with impaired lysosomal proteolysis in FTD. Highlights CSF markers of proteostasis were explored in CHMP2B-mediated frontotemporal dementia (FTD).31 members of the Danish CHMP2B-FTD family were included.We used solid-phase extraction and parallel reaction monitoring mass spectrometry.Six protein levels were significantly altered in CHMP2B-FTD compared with controls.Lower CSF ubiquitin levels in patients suggest association with disease mechanisms.
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Affiliation(s)
- Anders Toft
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
| | - Simon Sjödin
- Laboratory of Clinical ChemistrySahlgrenska University HospitalGothenburgSweden
| | - Anja Hviid Simonsen
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
| | - Patrick Ejlerskov
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
| | - Peter Roos
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
| | - Christian Sandøe Musaeus
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
| | - Emil Elbæk Henriksen
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
| | - Troels Tolstrup Nielsen
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
| | - Ann Brinkmalm
- Clinical Neurochemistry LaboratorySahlgrenska University HospitalMölndalSweden
| | - Kaj Blennow
- Clinical Neurochemistry LaboratorySahlgrenska University HospitalMölndalSweden,Department of Psychiatry and NeurochemistryInstitute of Neuroscience and Physiologythe Sahlgrenska Academy at the University of GothenburgMölndalSweden
| | - Henrik Zetterberg
- Clinical Neurochemistry LaboratorySahlgrenska University HospitalMölndalSweden,Department of Psychiatry and NeurochemistryInstitute of Neuroscience and Physiologythe Sahlgrenska Academy at the University of GothenburgMölndalSweden,Department of Neurodegenerative DiseaseUCL Institute of NeurologyQueen SquareLondonUK,UK Dementia Research Institute at UCLLondonUK,Hong Kong Center for Neurodegenerative DiseasesClear Water BayHong KongChina
| | - Jørgen Erik Nielsen
- Neurogenetics Clinic & Research LabDanish Dementia Research CentreRigshospitaletCopenhagenDenmark
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McWilliam O, Gramkow MH, Roos P, Vogel A. [Christmas article: Copenhagen Christmas Cognitive Examination]. Ugeskr Laeger 2022; 184:V80100. [PMID: 36510809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Introduction Motivation is important when administering cognitive tests. Routine cognitive testing may become trivial both for the examiner and the test subject when using tests that only incorporate neutral items. We hypothesized that a Christmas themed cognitive test could improve motivation for cognitive testing and might elicit positive emotional reactions. Methods We devised the Copenhagen Christmas Cognitive Examination (CCCE), a quickly administered test with ten items, all with Christmas themed content. The CCCE evaluates various important areas of cognition including anterograde and retrograde memory, visuoconstruction, naming and executive function. In this cross-sectional pilot study, we tested feasibility and further explored the possible emotional and motivational effects by administering a questionnaire with a 5-point Likert scale indicating agreement with statements regarding mood and motivation after testing. Results A total of 14 cognitively healthy participants (mean age 42 years (SD 12.3)) underwent testing with the CCCE. A high level of positive mood and motivation was present for most subjects after testing. Being in a Christmas mood after testing was significantly associated with higher test scores (Spearman's correlation coefficient 0.53, p = 0.019). Conclusion It was feasible to administer a Christmas themed cognitive test, and test subjects experienced positive emotional reactions after testing. Further testing in a non-healthy population is warranted. Funding none. Trial registration none.
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Affiliation(s)
- Oskar McWilliam
- Nationalt Videnscenter for Demens, Afdeling for Hjerne- og Nervesygdomme, Københavns Universitetshospital - Rigshospitalet
| | - Mathias Holsey Gramkow
- Nationalt Videnscenter for Demens, Afdeling for Hjerne- og Nervesygdomme, Københavns Universitetshospital - Rigshospitalet
| | - Peter Roos
- Nationalt Videnscenter for Demens, Afdeling for Hjerne- og Nervesygdomme, Københavns Universitetshospital - Rigshospitalet
| | - Asmus Vogel
- Nationalt Videnscenter for Demens, Afdeling for Hjerne- og Nervesygdomme, Københavns Universitetshospital - Rigshospitalet
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Roos P, Johannsen P, Lindquist SG, Brown JM, Waldemar G, Duno M, Nielsen TT, Budtz‐Jørgensen E, Gydesen S, Holm IE, Collinge J, Isaacs AM, Nielsen JE, Gade A, Stokholm J, Thusgaard T, Fisher EM, Englund E. Six generations of CHMP2B-mediated Frontotemporal Dementia: Clinical features, predictive testing, progression, and survival. Acta Neurol Scand 2022; 145:529-540. [PMID: 34997757 DOI: 10.1111/ane.13578] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 11/04/2021] [Accepted: 11/07/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Chromosome 3-linked frontotemporal dementia (FTD-3) is caused by a c.532-1G > C mutation in the CHMP2B gene. It is extensively studied in a Danish family comprising one of the largest families with an autosomal dominantly inherited frontotemporal dementia (FTD). This retrospective cohort study utilizes demographics to identify risk factors for onset, progression, life expectancy, and death in CHMP2B-mediated FTD. The pedigree of 528 individuals in six generations is provided, and clinical descriptions are presented. Choices of genetic testing are evaluated. MATERIALS AND METHODS Demographic and lifestyle factors were assessed in survival analysis in all identified CHMP2B mutation carriers (44 clinically affected FTD-3 patients and 16 presymptomatic CHMP2B mutation carriers). Predictors of onset and progression included sex, parental disease course, education, and vascular risk factors. Life expectancy was established by matching CHMP2B mutation carriers with average life expectancies in Denmark. RESULTS Disease course was not correlated to parental disease course and seemed unmodified by lifestyle factors. Diagnosis was recognized at an earlier age in members with higher levels of education, probably reflecting an early dysexecutive syndrome, unmasked earlier in people with higher work-related requirements. Carriers of the CHMP2B mutation had a significant reduction in life expectancy of 13 years. Predictive genetic testing was chosen by 20% of at-risk family members. CONCLUSIONS CHMP2B-mediated FTD is substantiated as an autosomal dominantly inherited disease of complete penetrance. The clinical phenotype is a behavioral variant FTD. The disease course is unpredictable, and life expectancy is reduced. The findings may be applicable to other genetic FTD subtypes.
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Affiliation(s)
- Peter Roos
- Danish Dementia Research Centre Department of Neurology Rigshospitalet University of Copenhagen Denmark
| | - Peter Johannsen
- Danish Dementia Research Centre Department of Neurology Rigshospitalet University of Copenhagen Denmark
- Medical & Science Novo Nordisk A/S Søborg Denmark
| | - Suzanne G. Lindquist
- Danish Dementia Research Centre Department of Neurology Rigshospitalet University of Copenhagen Denmark
- Department of Clinical Genetics, Rigshospitalet University of Copenhagen Denmark
| | | | - Gunhild Waldemar
- Danish Dementia Research Centre Department of Neurology Rigshospitalet University of Copenhagen Denmark
| | - Morten Duno
- Department of Clinical Genetics, Rigshospitalet University of Copenhagen Denmark
| | - Troels T. Nielsen
- Danish Dementia Research Centre Department of Neurology Rigshospitalet University of Copenhagen Denmark
| | - Esben Budtz‐Jørgensen
- Section of Biostatistics Department of Public Health University of Copenhagen Denmark
| | | | - Ida E. Holm
- Department of Pathology Aalborg University Hospital Randers Denmark
| | - John Collinge
- MRC Prion Unit at UCL UCL Institute of Prion Diseases Courtauld Building London UK
| | - Adrian M. Isaacs
- Department of Neuromuscular Diseases UCL Institute of Neurology Queen Square London UK
- UK Dementia Research Institute at UCL UCL Institute of Neurology Queen Square London UK
| | - Jørgen E. Nielsen
- Danish Dementia Research Centre Department of Neurology Rigshospitalet University of Copenhagen Denmark
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Løhde LW, Bentzon A, Kornblit BT, Roos P, Fink-Jensen A. Possible Tacrolimus-Related Neuropsychiatric Symptoms: One Year After Allogeneic Hematopoietic Cell Transplantation: A Case Report. Clin Med Insights Case Rep 2022; 15:11795476221087053. [PMID: 35342316 PMCID: PMC8941686 DOI: 10.1177/11795476221087053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 02/21/2022] [Indexed: 11/17/2022]
Abstract
Tacrolimus is a calcineurin inhibitor (CNI), an immunosuppressive agent used to
prevent graft versus host disease following allogeneic hematopoietic cell
transplantation (HCT). Side-effects of tacrolimus treatment include
neuropsychiatric symptoms, for example, affective disturbances, psychosis, and
akinetic mutism. The onset of side-effects is independent of tacrolimus blood
concentration and can occur years after treatment initiation. To our knowledge,
case-reports describing tacrolimus-induced neuropsychiatric symptoms following
HCT are sparse. This article reports the case of a 60-year-old woman with T-cell
prolymphocytic leukemia, who developed memory loss, affective disturbances, and
delusions, 1-year after HCT, and tacrolimus treatmentinitiation. Upon hospital
admission, she was motionless and mute, albeit easily roused. The routine
physical examination was without pathological findings. Blood work and
microbiological analyses of blood and cerebrospinal fluid were normal. The
neuroimaging showed chronic structural changes without relation to the debut of
neuropsychiatric symptoms. Tacrolimus was discontinued on suspicion of
tacrolimus-induced neuropsychiatric symptoms. The patient recovered within
48 hours of discontinuation. She was switch to prednisone treatment, and there
has been no reemergence of neuropsychiatric symptoms since.
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Affiliation(s)
| | | | | | - Peter Roos
- Department of Neurology and Neuroscience, Rigshospitalet, Denmark
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Toft A, Roos P, Jääskeläinen O, Musaeus CS, Henriksen EE, Johannsen P, Nielsen TT, Herukka SK, Hviid Simonsen A, Nielsen JE. Serum Neurofilament Light in Patients with Frontotemporal Dementia Caused by CHMP2B Mutation. Dement Geriatr Cogn Disord 2021; 49:533-538. [PMID: 33626531 DOI: 10.1159/000513877] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 12/13/2020] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION The potential of neurofilament light (NfL) as a blood-based biomarker is currently being investigated in autosomal dominant neurodegenerative disease. This study explores the clinical utility of serum-NfL in frontotemporal dementia due to CHMP2B mutation (FTD-3). METHODS This cross-sectional study included serum and CSF data from 38 members of the Danish FTD-3 family: 12 affected CHMP2B mutation carriers, 10 presymptomatic carriers, and 16 noncarriers. Serum-NfL levels measured by single-molecule array (Simoa) technology were tested for associations with the clinical groups and clinical parameters. Serum and CSF data were compared, and CSF/serum-albumin ratio was included as a measure of blood-brain barrier (BBB) function. RESULTS Serum-NfL concentrations were significantly increased in symptomatic CHMP2B mutation carriers compared to presymptomatic carriers and in both groups compared to healthy family controls. Serum-NfL levels appear to increase progressively with age in presymptomatic carriers, and this is perhaps followed by a change in trajectory when patients become symptomatic. Measurements of NfL in serum and CSF were highly correlated and fold-changes in serum and CSF between clinical groups were similar. Increase in serum-NFL levels was correlated with reduced ACE-score. Higher CSF/serum-albumin ratios were demonstrated in FTD-3 patients, but this did not affect the significant associations between serum-NfL and clinical groups. CONCLUSION Serum-NfL could be utilized as an accurate surrogate marker of CSF levels to segregate symptomatic CHMP2B carriers, presymptomatic carriers, and non-carriers. The observed indication of BBB dysfunction in FTD-3 patients did not confound this use of serum-NfL. The results support the occurrence of mutation-related differences in NfL dynamics in familial FTD.
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Affiliation(s)
- Anders Toft
- Neurogenetics Clinic & Research Lab, Danish Dementia Research Centre, Copenhagen, Denmark,
| | - Peter Roos
- Neurogenetics Clinic & Research Lab, Danish Dementia Research Centre, Copenhagen, Denmark
| | - Olli Jääskeläinen
- Institute of Clinical Medicine - Neurology, University of Eastern Finland, Ritva, Finland
| | | | - Emil Elbæk Henriksen
- Neurogenetics Clinic & Research Lab, Danish Dementia Research Centre, Copenhagen, Denmark
| | | | | | - Sanna-Kaisa Herukka
- Institute of Clinical Medicine - Neurology, University of Eastern Finland, Ritva, Finland
| | - Anja Hviid Simonsen
- Neurogenetics Clinic & Research Lab, Danish Dementia Research Centre, Copenhagen, Denmark
| | - Jørgen Erik Nielsen
- Neurogenetics Clinic & Research Lab, Danish Dementia Research Centre, Copenhagen, Denmark
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Musaeus CS, Pedersen JS, Kjær TW, Johannsen P, Waldemar G, Haverberg MJN, Bacher T, Nielsen JE, Roos P. Cortical Frontoparietal Network Dysfunction in CHMP2B-Frontotemporal Dementia. Front Aging Neurosci 2021; 13:714220. [PMID: 34588974 PMCID: PMC8475188 DOI: 10.3389/fnagi.2021.714220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 08/09/2021] [Indexed: 11/13/2022] Open
Abstract
A rare cause of inherited frontotemporal dementia (FTD) is a mutation in the CHMP2B gene on chromosome 3 leading to the autosomal dominantly inherited FTD (CHMP2B-FTD). Since CHMP2B-FTD is clinically well-characterized, and patients show a distinct pattern of executive dysfunction, the condition offers possible insight in the early electroencephalographic (EEG) changes in the cortical networks. Specifically, EEG microstate analysis parses the EEG signals into topographies believed to represent discrete network activations. We investigated the EEG dynamics in patients with symptomatic CHMP2B-FTD (n = 5) as well as pre-symptomatic mutation carriers (n = 5) compared to non-carrier family members (n = 6). The data was parsed into four archetypal microstates and global power was calculated. A trend was found for lower occurrence in microstate D in CHMP2B-FTD (p-value = 0.177, F-value = 2.036). Patients with recent symptom onset (<1 year) showed an increased duration of microstate D, whereas patients who had been symptomatic for longer periods (>2 years) showed decreased duration. Patients with CHMP2B-FTD present with executive dysfunction, and microstate D has previously been shown to be associated with the fronto-parietal network. The biphasic pattern may represent the pathophysiological changes in brain dynamics during neurodegeneration, which may apply to other neurodegenerative diseases.
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Affiliation(s)
- Christian Sandøe Musaeus
- Danish Dementia Research Centre (DDRC), Rigshospitalet and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Jette Stokholm Pedersen
- Danish Dementia Research Centre (DDRC), Rigshospitalet and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Troels Wesenberg Kjær
- Department of Neurology, Zealand University Hospital, Roskilde, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Peter Johannsen
- Danish Dementia Research Centre (DDRC), Rigshospitalet and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Gunhild Waldemar
- Danish Dementia Research Centre (DDRC), Rigshospitalet and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | | | - Theis Bacher
- Department of Neurology, Zealand University Hospital, Roskilde, Denmark
| | - Jørgen Erik Nielsen
- Danish Dementia Research Centre (DDRC), Rigshospitalet and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Peter Roos
- Danish Dementia Research Centre (DDRC), Rigshospitalet and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Roos P, Johannsen P, Lindquist SG, Brown J, Stokholm J, Waldemar G, Duno M, Nielsen TT, Nielsen JE. P3-274: MODIFIERS OF AGE-AT-ONSET IN FRONTOTEMPORAL DEMENTIA LINKED TO CHROMOSOME 3 (FTD-3). Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.3305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Peter Roos
- Danish Dementia Research Centre; Rigshospitalet; Copenhagen Denmark
| | - Peter Johannsen
- Danish Dementia Research Centre; Rigshospitalet; Copenhagen Denmark
| | | | - Jerry Brown
- Addenbrooke's Hospital; Cambridge United Kingdom
| | - Jette Stokholm
- Danish Dementia Research Centre; Rigshospitalet; Copenhagen Denmark
| | - Gunhild Waldemar
- Danish Dementia Research Centre; Rigshospitalet; Copenhagen Denmark
| | - Morten Duno
- Rigshospitalet; University of Copenhagen; Copenhagen Denmark
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Zakarias JK, Jensen-Dahm C, Nørgaard A, Roos P, Gasse C, Phung TKT, Waldemar G. Geographical Variation in the Diagnostic Rate and Quality of Dementia Diagnoses. J Alzheimers Dis 2019; 69:513-520. [DOI: 10.3233/jad-190030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Johanne Købstrup Zakarias
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Christina Jensen-Dahm
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Ane Nørgaard
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Peter Roos
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Christiane Gasse
- National Centre for Register-based Research, Aarhus University, Aarhus, Denmark
- Department of Depression and Anxiety/Psychosis Research Unit, Aarhus University Hospital, Department of Psychiatry, Risskov, Denmark
| | - Thien Kieu Thi Phung
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Gunhild Waldemar
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
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Rostgaard N, Roos P, Portelius E, Blennow K, Zetterberg H, Simonsen AH, Nielsen JE. CSF neurofilament light concentration is increased in presymptomatic CHMP2B mutation carriers. Neurology 2017; 90:e157-e163. [PMID: 29237796 PMCID: PMC5772154 DOI: 10.1212/wnl.0000000000004799] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Accepted: 09/28/2017] [Indexed: 12/13/2022] Open
Abstract
Objective A rare cause of familial frontotemporal dementia (FTD) is a mutation in the CHMP2B gene on chromosome 3 (FTD-3), described in a Danish family. Here we examine whether CSF biomarkers change in the preclinical phase of the disease. Methods In this cross-sectional explorative study, we analyzed CSF samples from 16 mutation carriers and 14 noncarriers from the Danish FTD-3 family. CSF biomarkers included total tau (t-tau) and neurofilament light chain (NfL) as a marker for neurodegeneration, phosphorylated tau (p-tau) as a marker for tau pathology, β-amyloid (Aβ) 38, 40, and 42 (Aβ38, Aβ40, and Aβ42) to monitor Aβ metabolism, and YKL-40 as a marker of neuroinflammation. Aβ isoform concentrations were measured using a multiplexed immunoassay; t-tau, p-tau, NfL, and YKL-40 concentrations were measured using sandwich ELISAs. Results CSF NfL concentration was significantly increased in mutation carriers vs noncarriers. Further, CSF NfL concentration was significantly higher in symptomatic mutation carriers compared to presymptomatic carriers, and also significantly higher in presymptomatic carriers compared to noncarriers. No differences in t-tau and p-tau and YKL-40 concentrations between controls and mutation carriers were observed. CSF concentrations of the Aβ peptides Aβ38 and Aβ40 but not Aβ42 were significantly lower in mutation carriers compared to noncarriers. Conclusions Increased NfL levels in presymptomatic individuals and in symptomatic patients with FTD-3 indicate a continuous process of neurodegeneration from the presymptomatic to symptomatic state. Although not specific for FTD-3 pathology, our data suggest that CSF NfL could serve as a valuable biomarker to detect onset of neurodegeneration in FTD-3 mutation carriers.
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Affiliation(s)
- Nina Rostgaard
- From the Danish Dementia Research Centre (N.R., P.R., A.H.S., J.E.N.), Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark; Clinical Neurochemistry Laboratory (E.P., K.B., H.Z.), Sahlgrenska University Hospital; Institute of Neuroscience and Physiology (E.P., K.B., H.Z.), Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden; and Department of Molecular Neuroscience and UK Dementia Research Institute (H.Z.), UCL Institute of Neurology, Queen Square, London, UK
| | - Peter Roos
- From the Danish Dementia Research Centre (N.R., P.R., A.H.S., J.E.N.), Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark; Clinical Neurochemistry Laboratory (E.P., K.B., H.Z.), Sahlgrenska University Hospital; Institute of Neuroscience and Physiology (E.P., K.B., H.Z.), Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden; and Department of Molecular Neuroscience and UK Dementia Research Institute (H.Z.), UCL Institute of Neurology, Queen Square, London, UK
| | - Erik Portelius
- From the Danish Dementia Research Centre (N.R., P.R., A.H.S., J.E.N.), Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark; Clinical Neurochemistry Laboratory (E.P., K.B., H.Z.), Sahlgrenska University Hospital; Institute of Neuroscience and Physiology (E.P., K.B., H.Z.), Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden; and Department of Molecular Neuroscience and UK Dementia Research Institute (H.Z.), UCL Institute of Neurology, Queen Square, London, UK
| | - Kaj Blennow
- From the Danish Dementia Research Centre (N.R., P.R., A.H.S., J.E.N.), Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark; Clinical Neurochemistry Laboratory (E.P., K.B., H.Z.), Sahlgrenska University Hospital; Institute of Neuroscience and Physiology (E.P., K.B., H.Z.), Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden; and Department of Molecular Neuroscience and UK Dementia Research Institute (H.Z.), UCL Institute of Neurology, Queen Square, London, UK
| | - Henrik Zetterberg
- From the Danish Dementia Research Centre (N.R., P.R., A.H.S., J.E.N.), Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark; Clinical Neurochemistry Laboratory (E.P., K.B., H.Z.), Sahlgrenska University Hospital; Institute of Neuroscience and Physiology (E.P., K.B., H.Z.), Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden; and Department of Molecular Neuroscience and UK Dementia Research Institute (H.Z.), UCL Institute of Neurology, Queen Square, London, UK
| | - Anja H Simonsen
- From the Danish Dementia Research Centre (N.R., P.R., A.H.S., J.E.N.), Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark; Clinical Neurochemistry Laboratory (E.P., K.B., H.Z.), Sahlgrenska University Hospital; Institute of Neuroscience and Physiology (E.P., K.B., H.Z.), Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden; and Department of Molecular Neuroscience and UK Dementia Research Institute (H.Z.), UCL Institute of Neurology, Queen Square, London, UK.
| | - Jørgen E Nielsen
- From the Danish Dementia Research Centre (N.R., P.R., A.H.S., J.E.N.), Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark; Clinical Neurochemistry Laboratory (E.P., K.B., H.Z.), Sahlgrenska University Hospital; Institute of Neuroscience and Physiology (E.P., K.B., H.Z.), Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden; and Department of Molecular Neuroscience and UK Dementia Research Institute (H.Z.), UCL Institute of Neurology, Queen Square, London, UK
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Rostgaard N, Roos P, Budtz-Jørgensen E, Johannsen P, Waldemar G, Nørremølle A, Lindquist SG, Gydesen S, Brown JM, Collinge J, Isaacs AM, Nielsen TT, Nielsen JE. TMEM106B and ApoE polymorphisms in CHMP2B-mediated frontotemporal dementia (FTD-3). Neurobiol Aging 2017; 59:221.e1-221.e7. [PMID: 28888721 DOI: 10.1016/j.neurobiolaging.2017.06.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 06/24/2017] [Accepted: 06/30/2017] [Indexed: 12/12/2022]
Abstract
Single-nucleotide polymorphisms in the TMEM106B gene have been identified as a risk factor in frontotemporal dementia (FTD). The major allele of SNP rs3173615 is a risk factor in sporadic FTD, whereas the minor allele seems protective in GRN- and C9orf72-mediated FTD. The role of apolipoprotein E (ApoE) in FTD is uncertain, though an established risk factor in Alzheimer's disease. In a unique Danish family, inherited FTD is caused by a mutation in the CHMP2B gene located on chromosome 3 (FTD-3). In this family, both risk factors TMEM106B and ApoE were analyzed and correlated to age at onset (AAO) and progression in terms of age at institutionalization (AAI) and age at death (AAD). Although TMEM106B and CHMP2B share cellular function in that both localize to endolysosomes, TMEM106B genotypes appeared to have no influence on the clinical disease course. ApoE ε4 was found to be a protective factor with later AAO and AAI, whereas ε2 seemed to aggravate the disease with earlier AAO and AAD. These results indicate ApoE ε2 as a risk factor in FTD-3 and suggest a protective role of ε4.
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Affiliation(s)
- Nina Rostgaard
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Section 6911, Copenhagen, Denmark
| | - Peter Roos
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Section 6911, Copenhagen, Denmark.
| | | | - Peter Johannsen
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Section 6911, Copenhagen, Denmark
| | - Gunhild Waldemar
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Section 6911, Copenhagen, Denmark
| | - Anne Nørremølle
- Section of Neurogenetics, Institute of Cellular and Molecular Medicine, The Panum Institute, University of Copenhagen, Copenhagen N, Denmark
| | - Suzanne G Lindquist
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Section 6911, Copenhagen, Denmark; Department of Clinical Genetics, Rigshospitalet, University of Copenhagen, Section 4062, Copenhagen, Denmark
| | - Susanne Gydesen
- Department of Psychiatry, Community Mental Health Services in Region Zealand, Nykøbing Sjælland, Denmark
| | - Jeremy M Brown
- Department of Neurology, Addenbrooke's Hospital, Cambridge, UK
| | - John Collinge
- MRC Prion Unit, Institute of Neurology, London, UK; Department of Neurodegenerative Disease, UCL Institute of Neurology, London, UK
| | - Adrian M Isaacs
- Department of Neurodegenerative Disease, UCL Institute of Neurology, London, UK; UK Dementia Research Institute at UCL, UCL Institute of Neurology, London, UK
| | | | - Troels T Nielsen
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Section 6911, Copenhagen, Denmark
| | - Jørgen E Nielsen
- Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Section 6911, Copenhagen, Denmark; Section of Neurogenetics, Institute of Cellular and Molecular Medicine, The Panum Institute, University of Copenhagen, Copenhagen N, Denmark
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Johannsen P, Stokholm J, Roos P, Law I, Isaacs AM, Brown J, Nielsen JE. P4‐184: Shift in Cerebral PET Glucose Metabolism in Frontotemporal Dementia Linked to Chromosome 3 (FTD‐3) from the Presymptomatic to Symtomatic Stage. Alzheimers Dement 2016. [DOI: 10.1016/j.jalz.2016.06.2276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peter Johannsen
- Danish Dementia Research Centre, Rigshospitalet, Copenhagen University HospitalCopenhagenDenmark
| | - Jette Stokholm
- Danish Dementia Research Centre, Rigshospitalet, Copenhagen University HospitalCopenhagenDenmark
| | - Peter Roos
- Danish Dementia Research Centre, Rigshospitalet, Copenhagen University HospitalCopenhagenDenmark
| | - Ian Law
- Rigshospitalet, Copenhagen University HospitalCopenhagenDenmark
| | - Adrian M. Isaacs
- UCL Institute of Neurology LondonUnited Kingdom of Great Britain and Northern Ireland
| | - Jerry Brown
- Addenbrooke's Hospital CambridgeUnited Kingdom of Great Britain and Northern Ireland
| | - Jorgen E. Nielsen
- Danish Dementia Research Centre, Rigshospitalet, Copenhagen University HospitalCopenhagenDenmark
- Institute of Cellular and Molecular Medicine, The Panum Institute, University of CopenhagenCopenhagenDenmark
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Rääf CL, Holstein H, Holm E, Roos P. Hair as an indicator of the body content of polonium in humans: preliminary results from study of five male volunteers. J Environ Radioact 2015; 141:71-75. [PMID: 25557609 DOI: 10.1016/j.jenvrad.2014.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 12/03/2014] [Accepted: 12/11/2014] [Indexed: 06/04/2023]
Abstract
The radionuclide (210)Po is of importance from a radiation protection view and has properties that cause special problems when attempting to determine the body content in humans. Estimates have traditionally been made from either urine and/or fecal samples, which require a time-consuming radiochemical preparation before alpha spectrometric determination. In order to find a more simple and less labor intensive method hair has been used as a bioindicator and investigated in this study. The relationship between intake and excretion in hair has been estimated in five volunteers who ingested radioactive polonium ((209)Po as a bio-tracer for (210)Po) in well determined quantities. Four of the volunteers were given 5-10 Bq (209)Po in a single intake (acute intake) and one volunteer has ingested a daily intake of 58.7 mBq (209)Po for a period of 180 d. Human hair was found to reflect the daily clearance of ingested polonium peaking at 0.001-0.01% d(-1) of the ingested amount, thereafter decreasing mono-exponentially, corresponding to a biological half-time of 10-20 days. For the case of protracted intake a mono-exponential build-up was observed with a half-time of 40 ± 5 d. In addition, after cessation of intake, a short-term component (74%) with a biological half-time of 16 ± 4 d, and a long-term component (26%) with a half-time of 93 ± 53 d were observed. It is concluded that hair can be used to detect not only the amount of ingested polonium but also whether the intake was protracted or acute.
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Affiliation(s)
- C L Rääf
- Medical Radiation Physics, Department of Clinical Sciences, Malmö, Lund University, Skåne University Hospital, SE-205 02 Malmö, Sweden.
| | - H Holstein
- Medical Radiation Physics, Department of Clinical Sciences, Malmö, Lund University, Skåne University Hospital, SE-205 02 Malmö, Sweden
| | - E Holm
- Department of Radiation Physics, Sahlgren Academy at the University of Gothenburg, SE-413 45, Sweden.
| | - P Roos
- DTU Nutech, Risø Campus, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark.
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Roos P, Berzborn RJ. Electroimmunodiffusion — a Powerful Tool for Quantitative Determinations of Both Soluble and Membrane Bound Chloroplast ATPase, CF1. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znc-1983-9-1021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
1. Electroimmunodiffusion can be used for routine specific quantitative microdeterminations of photosynthetic ATP-synthase. The method has been worked out for samples of both the dissociated (CF1) and the membrane bound enzyme (CF0CF1).
2. Only a monospecific antiserum against CF1 , is required for relative determinations of CF1 in any fraction. If beyond this an absolute determination is intended of either the separated or the membrane bound ATPase, in addition a pure CF1 , is needed for calibration.
3. A varying CF1/chlorophyll ratio between 1/700 and 1/1200 has been found for thylakoids of spinach plants grown under various light intensities.
4. Since the amount of CF1 , was the limiting factor of photophosphorylation capacity in the electron transport system used (PMS), from simultaneous measurement of CF1 , content and photophosphorylation capacity a turn over time of the ATPsynthase of 4 ms /ATP /CF0CF1 could be recalculated.
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Affiliation(s)
- Peter Roos
- Lehrstuhl Biochemie der Pflanzen, Abt. Biologie Ruhr-Universität Bochum , Postfach 10 21 48, D -4630-Bochum 1, Bundesrepublik Deutschland
- Present address: Institut für Biophysik und Elektronenmiskroskopie, Universität Düsseldorf
| | - Richard J. Berzborn
- Lehrstuhl Biochemie der Pflanzen, Abt. Biologie Ruhr-Universität Bochum , Postfach 10 21 48, D -4630-Bochum 1, Bundesrepublik Deutschland
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Roos P. P916: Metal concentrations in cerebrospinal fuid and blood plasma from patients with neurodegenerative disorders. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50951-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Roos P, Svenstrup K, Danielsen ER, Thomsen C, Nielsen JE. CYP7B1: novel mutations and magnetic resonance spectroscopy abnormalities in hereditary spastic paraplegia type 5A. Acta Neurol Scand 2014; 129:330-4. [PMID: 24117163 DOI: 10.1111/ane.12188] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/28/2013] [Indexed: 12/12/2022]
Abstract
UNLABELLED The SPG5A subtype of Hereditary Spastic Paraplegia (HSP) is a rare autosomal recessive neurodegenerative disorder caused by mutations in the CYP7B1 gene, which encodes a steroid cytochrome P450 7α-hydroxylase. This enzyme provides the primary metabolic route for neurosteroids. Clinically, SPG5A has been characterized as a pure form of HSP with a variable age of onset, but recently a broader spectrum of phenotypes has been described. OBJECTIVE This study characterizes four unrelated SPG5A patients through clinical evaluation. METHODS The investigations included blood biochemistry, electrophysiology, brain MRI and MR spectroscopy. RESULTS One patient had saccadic pursuit eye movements in addition to a pure HSP phenotype. Motor evoked potential (MEP) examinations revealed prolonged central conduction time. MRI of the brain showed white matter hyperintensities (WMH) in one patient. MRS showed elevated mI/Cr ratio in white matter in two patients; in the one patient with WMH and in one patient with normal MRI. Four novel mutations were identified; one frameshift (c.509 delT p.L170fs), one premature stop codon (c.334 C>T p.R112X), one amino acid changing (c.440 G>A p.G147D) and one duplication (c.945_947 dupGGC p.A316AA). CONCLUSION SPG5A could be characterized as a predominantly pure HSP. MRS showing elevated mI/Cr ratio in the white matter may be indicative of SPG5A.
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Affiliation(s)
- P. Roos
- Memory Disorders Research Group; Department of Neurology; Neurogenetics Clinic; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
| | - K. Svenstrup
- Memory Disorders Research Group; Department of Neurology; Neurogenetics Clinic; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
- Section of Neurogenetics; Department of Cellular and Molecular Medicine; The Panum Institute; University of Copenhagen; Copenhagen Denmark
| | - E. R. Danielsen
- Department of Radiology; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
| | - C. Thomsen
- Department of Radiology; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
| | - J. E. Nielsen
- Memory Disorders Research Group; Department of Neurology; Neurogenetics Clinic; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
- Section of Neurogenetics; Department of Cellular and Molecular Medicine; The Panum Institute; University of Copenhagen; Copenhagen Denmark
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Van Loco J, Van Leeuwen SPJ, Roos P, Carbonnelle S, de Boer J, Goeyens L, Beernaert H. The international validation of bio- and chemical-analytical screening methods for dioxins and dioxin-like PCBs: the DIFFERENCE project rounds 1 and 2. Talanta 2012; 63:1169-82. [PMID: 18969546 DOI: 10.1016/j.talanta.2004.05.047] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2004] [Revised: 05/13/2004] [Accepted: 05/13/2004] [Indexed: 10/26/2022]
Abstract
The European research project DIFFERENCE is focussed on the development, optimisation and validation of screening methods for dioxin analysis, including bio-analytical and chemical techniques (CALUX, GC-LRMS/MS, GCxGC-ECD) and on the optimisation and validation of new extraction and clean-up procedures. The performance of these techniques is assessed in an international validation study and the results are compared with the reference technique GC-HRMS. This study is set up in three rounds and is in accordance with the International Harmonized Protocol for Proficiency Studies and the ISO 5725 standard. The results of the first two rounds are very promising in particular for GC-LRMS/MS. The results obtained with this technique were as accurate as the results reported by the labs using the GC-HRMS. The initial results reported for GCxGC-ECD overestimate the dioxin concentration in the samples. The results reported by the labs using the CALUX technique underestimate the total TEQ concentrations in the samples, compared to the GC-HRMS reference method. The repeatability of the CALUX is significantly higher than the other screening techniques. It was shown that accelerated solvent extraction (ASE) is a valid alternative extraction and clean-up procedure for fish oil and vegetable oil. The results obtained with CALUX and GC-HRMS after ASE are equivalent to the results obtained with the classical extraction and purification procedures.
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Affiliation(s)
- J Van Loco
- Scientific Institute for Public Health (IPH), Juliette Wytsmanstraat 14, B-1050 Brussels, Belgium
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Vonk JE, Sánchez-García L, van Dongen BE, Alling V, Kosmach D, Charkin A, Semiletov IP, Dudarev OV, Shakhova N, Roos P, Eglinton TI, Andersson A, Gustafsson Ö. Activation of old carbon by erosion of coastal and subsea permafrost in Arctic Siberia. Nature 2012; 489:137-40. [DOI: 10.1038/nature11392] [Citation(s) in RCA: 244] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Accepted: 07/03/2012] [Indexed: 11/09/2022]
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Androić D, Armstrong DS, Arvieux J, Bailey SL, Beck DH, Beise EJ, Benesch J, Benmokhtar F, Bimbot L, Birchall J, Bosted P, Breuer H, Capuano CL, Chao YC, Coppens A, Davis CA, Ellis C, Flores G, Franklin G, Furget C, Gaskell D, Gericke MTW, Grames J, Guillard G, Hansknecht J, Horn T, Jones MK, King PM, Korsch W, Kox S, Lee L, Liu J, Lung A, Mammei J, Martin JW, McKeown RD, Micherdzinska A, Mihovilovic M, Mkrtchyan H, Muether M, Page SA, Papavassiliou V, Pate SF, Phillips SK, Pillot P, Pitt ML, Poelker M, Quinn B, Ramsay WD, Real JS, Roche J, Roos P, Schaub J, Seva T, Simicevic N, Smith GR, Spayde DT, Stutzman M, Suleiman R, Tadevosyan V, van Oers WTH, Versteegen M, Voutier E, Vulcan W, Wells SP, Williamson SE, Wood SA. Measurement of the parity-violating asymmetry in inclusive electroproduction of π- near the Δ0 resonance. Phys Rev Lett 2012; 108:122002. [PMID: 22540573 DOI: 10.1103/physrevlett.108.122002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Indexed: 05/31/2023]
Abstract
The parity-violating (PV) asymmetry of inclusive π- production in electron scattering from a liquid deuterium target was measured at backward angles. The measurement was conducted as a part of the G0 experiment, at a beam energy of 360 MeV. The physics process dominating pion production for these kinematics is quasifree photoproduction off the neutron via the Δ0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant d(Δ)- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated d(Δ)- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from A(γ)-=-5.2 to +5.2 ppm. The measurement performed in this work leads to A(γ)-=-0.36±1.06±0.37±0.03 ppm (where sources of statistical, systematic and theoretical uncertainties are included), which would disfavor enchancements considered by Zhu et al. proportional to V(ud)/V(us). The measurement is part of a program of inelastic scattering measurements that were conducted by the G0 experiment, seeking to determine the N-Δ axial transition form factors using PV electron scattering.
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Affiliation(s)
- D Androić
- Department of Physics, University of Zagreb, Zagreb HR-41001, Croatia
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20
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Androić D, Armstrong DS, Arvieux J, Bailey SL, Beck DH, Beise EJ, Benesch J, Benmokhtar F, Bimbot L, Birchall J, Bosted P, Breuer H, Capuano CL, Chao YC, Coppens A, Davis CA, Ellis C, Flores G, Franklin G, Furget C, Gaskell D, Gericke MTW, Grames J, Guillard G, Hansknecht J, Horn T, Jones MK, King PM, Korsch W, Kox S, Lee L, Liu J, Lung A, Mammei J, Martin JW, McKeown RD, Micherdzinska A, Mihovilovic M, Mkrtchyan H, Muether M, Page SA, Papavassiliou V, Pate SF, Phillips SK, Pillot P, Pitt ML, Poelker M, Quinn B, Ramsay WD, Real JS, Roche J, Roos P, Schaub J, Seva T, Simicevic N, Smith GR, Spayde DT, Stutzman M, Suleiman R, Tadevosyan V, van Oers WTH, Versteegen M, Voutier E, Vulcan W, Wells SP, Williamson SE, Wood SA, Pasquini B, Vanderhaeghen M. Transverse beam spin asymmetries at backward angles in elastic electron-proton and quasielastic electron-deuteron scattering. Phys Rev Lett 2011; 107:022501. [PMID: 21797598 DOI: 10.1103/physrevlett.107.022501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Indexed: 05/31/2023]
Abstract
We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasielastic scattering on the deuteron, at backward angles (lab scattering angle of 108°) for Q² = 0.22 GeV²/c² and 0.63 GeV²/c² at beam energies of 362 and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single-photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (πN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasistatic deuterium approximation, and is also in agreement with theory.
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Affiliation(s)
- D Androić
- Department of Physics, University of Zagreb, Zagreb HR-41001, Croatia
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Brown JE, Gjelsvik R, Roos P, Kålås JA, Outola I, Holm E. Levels and transfer of 210Po and 210Pb in Nordic terrestrial ecosystems. J Environ Radioact 2011; 102:430-437. [PMID: 20650552 DOI: 10.1016/j.jenvrad.2010.06.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 06/22/2010] [Accepted: 06/23/2010] [Indexed: 05/29/2023]
Abstract
Recent developments regarding environmental impact assessment methodologies for radioactivity have precipitated the need for information on levels of naturally occurring radionuclides within and transfer to wild flora and fauna. The objectives of this study were therefore to determine activity concentrations of the main dose forming radionuclides (210)Po and (210)Pb in biota from terrestrial ecosystems thus providing insight into the behaviour of these radioisotopes. Samples of soil, plants and animals were collected at Dovrefjell, Central Norway and Olkiluoto, Finland. Soil profiles from Dovrefjell exhibited an approximately exponential fall in (210)Pb activity concentrations from elevated levels in humus/surface soils to "supported" levels at depth. Activity concentrations of (210)Po in fauna (invertebrates, mammals, birds) ranged between 2 and 123 Bq kg(-1)d.w. and in plants and lichens between 20 and 138 Bq kg(-1)d.w. The results showed that soil humus is an important reservoir for (210)Po and (210)Pb and that fauna in close contact with this media may also exhibit elevated levels of (210)Po. Concentration ratios appear to have limited applicability with regards to prediction of activity concentrations of (210)Po in invertebrates and vertebrates. Biokinetic models may provide a tool to explore in a more mechanistic way the behaviour of (210)Po in this system.
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Affiliation(s)
- J E Brown
- Norwegian Radiation Protection Authority, PO Box 55, N-1332, Østerås, Norway.
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Henricsson F, Ranebo Y, Holm E, Roos P. Aspects on the analysis of 210Po. J Environ Radioact 2011; 102:415-419. [PMID: 20970897 DOI: 10.1016/j.jenvrad.2010.09.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Revised: 09/09/2010] [Accepted: 09/28/2010] [Indexed: 05/30/2023]
Abstract
There has been little development regarding analysis of polonium (Po) in environmental samples since the 1960 ies. This is due to the straightforward spontaneous deposition of this element on silver (Ag), nickel (Ni) or copper (Cu) without any radiochemical separation. For many years, no radiochemical yield determinant was used and it was generally supposed that the yield was 100% after two depositions. Counting was often done using ZnS scintillation counter coupled to a photomultiplier tube. However, the use of the yield determinants (208)Po and (209)Po and the development of alpha spectrometry showed that the yield was lower. Furthermore, the tendency of Po to volatilize at low temperatures constrains the sample preparation techniques; dry-ashing cannot be used. But during the wet-ashing procedure, there are still some losses. The aim of this study was to evaluate the Po losses during wet-ashing by the use of a double-tracer technique. We have found that the losses were about 30% when open glass beakers were used and about 17% when the samples were digested in microwave oven. When long-necked bottles (Kjeldahl flasks) were used, a loss of about 20% was registered. It has also been observed that (210)Pb to some extent is plating out together with its daughter nuclide Po during the electrochemical deposition. This will result in a systematic error since an unknown amount of supported (210)Po will be produced from the (210)Pb decay depending on the fraction of (210)Pb being deposited on the disc and the waiting time between deposition and measurement of the sample. A further consequence of this is that in the assessment of the (210)Pb content in the sample, very often the remaining liquid is stored after deposition for build-up of (210)Po. Since some (210)Pb is lost on the disc, the result for (210)Pb will be too low. Both these systematic errors give rise to a too high (210)Po/(210)Pb ratio. The fraction of (210)Pb which is plating out has been assessed in this study for different matrices and is about 50-90%. During the measurement by solid state Si-detectors, some Po is evaporated in the vacuum conditions contaminating the detectors. Experiments have here been done by heating the discs after deposition which indicate that less Po is evaporated from Ag than from Ni. The losses from Ag are less than that from the other metals probably due to a deeper penetration into the surface of Po. We conclude that in most aspects, Ag is better to use than the other plating metals.
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Affiliation(s)
- F Henricsson
- Department of Medical Radiation Physics, Lund University Hospital, 221 85 Lund, Sweden.
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Biever P, Schwab T, Roos P, Willnauer O, Denz U, Fink K, Bode C, Busch HJ. Microvascular dysfunction in patients after successful resuscitation. Crit Care 2011. [PMCID: PMC3066983 DOI: 10.1186/cc9729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Judge K, Botros L, Henson M, Roos P, Sakkas D. Analysis of day 2 and 5 embryo culture media samples using an in-clinic near infrared (NIR) spectroscopy procedure. Fertil Steril 2010. [DOI: 10.1016/j.fertnstert.2010.07.215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Versieren K, Heindryckx B, Qian C, Gerris J, De Sutter P, Exposito Navarro A, Ametzazurra A, Nagore D, Crisol L, Aspichueta F, Mendoza R, Matorras R, Garcia MM, Valley JK, Swinton PS, Boscardin WJ, Lue TF, P. Rinaudo, Wu MC, Bern O, Strassburger D, Komarovsky D, Kasterstein E, Komsky A, Maslansky B, Raziel A, Friedler S, Gidoni Y, Ron-El R, Tang J, Fang C, Zhang MF, Li T, Zhuang GL, Suh DS, Joo JK, Choi JR, Kim SC, JO MS, Kim KH, Lee KS, Katz-Jaffe MG, Stevens J, McCormick S, Smith R, Schoolcraft WB, Ben-Ami I, Komsky A, Strassburger D, Bern O, Komarovsky D, Kasterstein E, Maslansky B, Raziel A, Friedler S, Gidoni Y, Ron-El R, Koch J, Costello M, Kilani S, Namm A, Arend A, Aunapuu M, Joo JK, Lee KS, Choi YM, Cho JD, Sipe C, Pelts EJ, Matthews JM, Sanchez SR, Brohammer RLB, Wagner Y, Liebermann J, Uhler M, Beltsos A, Chen MJ, Guu HF, Chen YF, Yih YJ, Ho JYP, Lin TY, Ho ESC, Lopes FB, Figueira RCS, Braga DPAF, Ferreira RC, Aoki T, Iaconelli A, Borges E, Van de Velde H, Cauffman G, Verloes A, De Paepe C, Sterckx J, Van Ranst H, Devroey P, Tournaye H, Liebaers I, Santos MA, Teklenburg G, Macklon NS, Van Opstal D, Schuring-Blom GH, Krijtenburg PJ, de Vreeden-Elbertse J, Fauser BC, Baart EB, Cawood S, Doshi A, Gotts S, Serhal P, Milachich T, Petkova L, Barov D, Shterev A, Esteves TC, Balbach ST, Arauzo-Bravo MJ, Pfeiffer MJ, Boiani M, Le Gac S, van Rossem F, Esteves T, Bioani M, van den Berg A, Valeri C, Pappalardo S, De Felici M, Manna C, Ryu H, Park CY, Min SH, Choi SK, Park C, Lee SH, Kim KR, Jeong H, Chi HJ, Wittemer C, Celebi C, Viville S, Luceno Maestre F, Castilla Alcala JA, Gomez-Palomares JL, Cabello Y, Hernandez J, Marqueta J, Herrero J, Vidal E, Fernandez-Shaw S, Coroleu B, McRae C, Baskind E, Sharma V, Fisher J, Boldi Cotti P, Colasante C, Perego L, De Lauretis L, Montag M, Koster M, Nikolov A, van der Ven H, Lee SG, Lee YC, Kang SM, Kang YJ, Shin YK, Jung JH, Lim JH, Dorfmann A, Carroll K, Sisson M, Geltinger M, Yap S, Iwaszko M, Hara T, Naruse K, Matsuura K, Kodama T, Sato K, Tateaki Y, Tanaka J, Minasi MG, Scarselli F, Rubino P, Casciani V, Colasante A, Lobascio M, Alviggi E, Ferrero S, Litwicka K, Iammarrone E, Cucinelli F, Giannini PG, Tocci A, Nagy ZP, Greco E, Borini A, Tarozzi N, Fiorentin D, Bonu MA, Nadalini M, Johnson J, De Santis L, Bianchi V, Casciani V, Rubino P, Minasi MG, Colasante A, Scarselli F, Lobascio AM, Arizzi L, Iammarrone E, Litwicka K, Ferrero S, Tocci A, Piscitelli C, Cucinelli F, Nagy ZP, Greco E, Mesut N, Ciray HN, Mesut A, Aksoy T, Bahceci M, Lee YM, Chen HW, Wu P, Tzeng CR, Antonova I, Milachich T, Petkova L, Yunakova M, Chaveeva P, A. Shterev, Hlinka D, Dudas M, Rutarova J, Rezacova J, Lazarovska S, Aoi Y, Takahashi H, Saitou H, Takiue C, Kawakami N, Tone M, Hirata R, Terada S, Yoshioka N, Habara T, Hayashi N, Montagut J, Bonald F, Guillen N, Guitard V, Balu-Genvrin E, Crae E, Nogueira D, Silva J, Cunha M, Viana P, Teixeira da Silva JM, Oliveira C, Goncalves A, Barros N, Sousa M, Barros A, van de Werken C, Jahr H, Laven JSE, Baart EB, Gamiz Izquierdo P, De los Santos JM, Tejera A, Pellicer A, Romero JL, Galan A, Albert C, Santos MJDL, Adriaenssens T, Wathlet S, Segers I, Verheyen G, Van De Velde H, Coucke W, Devroey P, Smitz J, Paternot G, D'Hooghe TM, Debrock S, Spiessens C, Hwang HK, Kim HM, Lee JH, Jung YJ, Kang A, Kook MJ, Jung JY, An SJ, Kwon HC, Lee SJ, Somova O, Feskov A, Feskova I, Chumakova N, Zozulina O, Zhilkova YE, Binda M, Campo R, Van Kerkhoven G, Frederickx V, Serneels A, Roziers P, Vranken I, Lopes AS, Van Nuland A, Gordts S, Puttemans P, Valkenburg M, Gordts S, Rodriguez-Arnedo A, Ten J, Guerrero J, Lledo B, Carracedo MA, Ortiz JA, Llacer J, Bernabeu R, Usui K, Nakajo Y, Ota M, Hattori H, Kyoya T, Takisawa T, Kyono K, Ferrieres A, Poulain M, Loup V, Anahory T, Dechaud H, Hamamah S, Eckert J, Premkumar G, Lock F, Brooks S, Haque S, Cameron IT, Cheong Y, Fleming TP, Prados N, Ruiz M, Garcia-Ortega J, Vime P, Hernaez MJ, Crespo M, Fernandez-Sanchez M, Pellicer A, Hashimoto S, Kato N, Saeki K, Morimoto Y, Leung CON, Pang RTK, Liu WM, Lee KF, Yeung WSB, Wada T, Elliott T, Kahn J, Lowderman J, Wright G, Chang C, Bernal D, Kort H, Nagy Z, de los Santos JM, Escrich L, Grau N, Pellicer A, Romero JL, Escriba MJ, Escriba M, Grau N, Escrich L, de los Santos JM, Pellicer A, Romero JL, Tasker F, Hamoda H, Wilner H, Grace J, Khalaf Y, Miyaji S, Mizuno S, Horiuchi L, Haruki A, Fukuda A, Morimoto Y, Utsunomiya T, Kumasako Y, Ito H, Goto K, Koike M, Abe H, Sakamoto T, Kojima F, Koshika T, Muzii L, Magli MC, Gioia L, Scaravelli G, Ferraretti AP, Gianaroli L, Capoti A, Magli MC, Lappi M, Maggi E, Ferraretti AP, Gianaroli L, Scott L, Finn A, Kloos B, Davies D, Yamada M, Hamatani T, Akutsu H, Chikazawa N, Ogawa S, Okumura N, Mochimaru Y, Kuji N, Aoki D, Yoshimura Y, Umezawa A, Aprysko VP, Yakovenko SA, Seregina EA, Yutkin EV, Yelke H, Milik S, Candan ZN, Altin G, Unal S, Atayurt Z, Y. Kumtepe, Chung JT, Son WY, Zhang X, Tan SL, Ao A, Seli E, Botros L, Henson M, Roos P, Judge K, Sakkas D, group MSGMS, Feliciano M, Monahan D, Ermolovich E, Rosenwaks Z, Palermo GD, Mantikou E, van Echten-Arends J, Sikkema-Raddatz B, van der Veen F, Repping S, Mastenbroek S, Botros L, Seli E, Henson M, Roos P, Judge K, Sakkas D, Group MBS, Wells V, Thum MY, Abdalla HI, Machiya R, Akimoto S, Nobuyoshi T, Yoshii N, Hosaka T, Odawara Y, Heindryckx B, Vanden Meerschaut F, Lierman S, Qian C, O'Leary T, Gerris J, De Sutter P, Assou S, Haouzi D, Pellestor F, Monzo C, Dechaud H, De Vos J, Hamamah S, Conaghan J, Fischer E, Popwell J, Ryan I, Chenette P, Givens C, Schriock E, Herbert C, Ermolovich E, Monahan D, Neri QV, Rosenwaks Z, Palermo GD, Verheyen G, Camus M, Van de Velde H, Haentjens P, Devroey P, Mugica A, Esbert M, Molina JM, Garrido N, Pellicer A, Ballesteros A, Calderon G, Rossi ALS, Rocha AM, Alegretti JR, Hassun PA, Gomes LP, Criscuollo T, Serafini P, Motta ELA, Munoz M, Meseguer M, Cruz M, Perez-Cano I, Pellicer A, Gadea B, Martinez M, Fortuno S, Gundersen J, Garrido N, Cruz M, Garrido N, Perez-Cano I, Munoz M, Pellicer A, Martinez M, Gadea B, Selles E, Betersen J, Meseguer M, Le Meaux E, Assou S, Haouzi D, Loup V, Dechaud H, De Vos J, Hamamah S, Ouandaogo G, Assou S, Haouzi D, Ferrieres A, Anahory T, De Vos J, Hamamah S, Monzo C, Assou S, Haouzi D, Pellestor F, Dechaud H, De Vos J, S. Hamamah, Gismano E, Borini A, Cino I, Calzi F, Rabellotti E, Papaleo E, Bianchi V, De Santis L, Sunkara SK, Siozos A, Bolton V, Khalaf Y, Braude P, El-Toukhy T, Cho YS, Ambruosi B, Totaro P, Dell'Aquila ME, Gioacchini G, Bizzaro D, Giorgini E, Ferraris P, Sabbatini S, Carnevali O, Knaggs P, Chau A, Khalil S, Trew G, Lavery S, Jovanovic VP, Gomez R, Sauer CM, Shawber CJ, Outtz HH, Wang X, Sauer MV, Kitajewski J, Zimmermann RC, Mahrous E, Clarke H, Virant-Klun I, Bacer-Kermavner L, Mivsek J, Tomazevic T, Pozlep B, Zorn B, Vrtacnik-Bokal E, Dundure I, Bazarova J, Fodina V, Brikune J, Lakutins J, Jee B, Jo J, Lee J, Suh C, Kim S, Moon S, Shufaro Y, Lebovich M, Aizenman E, Simon A, Laufer N, A. Saada Reisch, Ribeiro MA, Pinto A, Gomes F, Silva Carvalho JL, Almeida H, Massaro FC, Petersen CG, Mauri AL, Silva LFI, Nicoletti APM, Cavagna M, Pontes A, Baruffi RLR, Oliveira JBA, Franco JG, Valcarcel A, Viglierchio MI, Tiveron M, Guidobono M, Inza R, Vilela M, Vilela M, Valcarcel A, Viglierchio MI, Kenny A, Lombardi C, Marconi G. Posters * Embryology (Embryo Selection). Hum Reprod 2010. [DOI: 10.1093/humrep/de.25.s1.140] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tejera A, Herrero J, Ramsing N, Pellicer A, Garrido N, Grau N, De los Santos MJ, Meseguer M, Sakkas D, Henman M, Harrison P, Botros L, Henson M, Judge K, Roos P, Guerin JF, Guillemin Y, Cornut A, Aouacheria A, Cortezzi SS, Figueira RCS, Eberlin MN, Braga DPAF, Ferreira CR, Souza GHMF, Garcia JS, Iaconelli A, Borges E, Ishikawa T, Nakajo Y, Ota M, Doshida M, Toya M, Kyono K, Drakakis P, Vlismas A, Partsinevelos G, Desmarais B, Bletsa R, Kallianidis K, Loutradis D, Antsaklis A, Kiessling A. Session 03: Novel Embryonic Markers. Hum Reprod 2010. [DOI: 10.1093/humrep/de.25.s1.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Androić D, Armstrong DS, Arvieux J, Bailey SL, Beck DH, Beise EJ, Benesch J, Benmokhtar F, Bimbot L, Birchall J, Bosted P, Breuer H, Capuano CL, Chao YC, Coppens A, Davis CA, Ellis C, Flores G, Franklin G, Furget C, Gaskell D, Gericke MTW, Grames J, Guillard G, Hansknecht J, Horn T, Jones M, King PM, Korsch W, Kox S, Lee L, Liu J, Lung A, Mammei J, Martin JW, McKeown RD, Mihovilovic M, Micherdzinska A, Mkrtchyan H, Muether M, Page SA, Papavassiliou V, Pate SF, Phillips SK, Pillot P, Pitt ML, Poelker M, Quinn B, Ramsay WD, Real JS, Roche J, Roos P, Schaub J, Seva T, Simicevic N, Smith GR, Spayde DT, Stutzman M, Suleiman R, Tadevosyan V, van Oers WTH, Versteegen M, Voutier E, Vulcan W, Wells SP, Williamson SE, Wood SA. Strange quark contributions to parity-violating asymmetries in the backward angle G0 electron scattering experiment. Phys Rev Lett 2010; 104:012001. [PMID: 20366359 DOI: 10.1103/physrevlett.104.012001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Indexed: 05/29/2023]
Abstract
We have measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q2=0.22 and 0.63 GeV2. They are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of approximately < 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial-vector current at these four-momentum transfers.
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Affiliation(s)
- D Androić
- Department of Physics, University of Zagreb, Zagreb HR-41001, Croatia
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Real J, Androić D, Armstrong D, Arvieux J, Bailey S, Beck D, Beise E, Benesch J, Benmokhtar F, Bimbot L, Birchall J, Bosted P, Breuer H, Capuano C, Chao YC, Coppens A, Davis C, Ellis C, Flores G, Franklin G, Furget C, Gaskell D, Gericke M, Grames J, Guillard G, Hansknecht J, Horn T, Jones M, King P, Korsch W, Kox S, Lee L, Liu J, Lung A, Mammei J, Martin J, McKeown R, Micherdzinska A, Mihovilovic M, Mkrtchyan H, Muether M, van Oers W, Page S, Papavassiliou V, Pate S, Phillips S, Pillot P, Pitt M, Poelker M, Quinn B, Ramsay W, Roche J, Roos P, Schaub J, Seva T, Simicevic N, Smith G, Spayde D, Stutzman M, Suleiman R, Tadevosyan V, Versteegen M, Voutier E, Vulcan W, Wells S, Williamson S, Wood S. Recent results from the G0experiment. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100303004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Sakkas D, Morita H, Botros L, Kato O, Yamashita N, Roos P. Near-infrared (NIR) analysis of day 2 embryo culture media from the cohort of patients morphologically good grade embryos. Fertil Steril 2009. [DOI: 10.1016/j.fertnstert.2009.07.1547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Seli E, Botros L, Henson M, Roos P, Sakkas D. Viability scores determined by metabolomic assessment of embryo culture media correlate with IVF outcome in women undergoing single embryo transfer on day 2: a prospective multi-center study. Fertil Steril 2009. [DOI: 10.1016/j.fertnstert.2009.07.1544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hardarson T, Tucker M, Seli E, Botros L, Roos P, Sakkas D. Non-invasive metabolic profiling of day 5 embryo culture media adds to the discriminatory power of blastocyst culture for single embryo transfer. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.07.885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Gehrmann M, Schmidt M, Brase JC, Roos P, Hengstler JG. Prediction of paclitaxel resistance in breast cancer: is CYP1B1*3 a new factor of influence? Pharmacogenomics 2008; 9:969-74. [PMID: 18597657 DOI: 10.2217/14622416.9.7.969] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This article focuses on the recent findings by Marsh and colleagues, and also discusses recent findings with regards to breast cancer. Taxanes are amongst the most active agents in the treatment of breast cancer. However, many tumors are intrinsically resistant. Therefore, it would be an enormous progress, if factors could be identified that reliably differentiate between taxane-sensitive and -resistant patients. Marsh and colleagues analyzed the CYP1B1*3 (Val432Leu) polymorphism in patients with high-risk stage III and IV breast cancer, who received dose-intense paclitaxel in combination with doxorubicin and cyclophosphamide. They report for the first time that patients with two leucine alleles in codon 432 of CYP1B1 experience a longer progression-free survival compared with patients with the Val/Leu or Val/Val genotypes. If confirmed in independent cohorts CYP1B1*3 may prove to be an important factor that helps to differentiate between paclitaxel-sensitive and resistant breast cancer patients. However, the mechanism behind the association between CYP1B1*3 and prognosis of paclitaxel-treated patients remains unclear. Several studies provide strong evidence that CYP1B1 does not influence tumor progression independently from paclitaxel chemotherapy, and that CYP1B1 itself does not alter paclitaxel resistance. In addition, CYP1B1 mRNA expression does not correlate with paclitaxel sensitivity of primary tumor cells. Although still speculative, a possible explanation is an association between CYP1B1*3 with still unknown factors that, on their part, influence paclitaxel sensitivity. In the future, studies with SNP chips and studies on the transcriptome, proteome and metabolome level should be performed in order to identify signatures differentiating between paclitaxel-sensitive and -resistant patients.
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Shapiro E, Colbeth R, Mollov I, Mollov T, Pavkovich J, Roos P, Star-Lack J, Tognina C, Starman J. WE-D-332-01: Advances in Sub-Second CT Scanning with a 64-Row Amorphous Silicon Flat Panel Imager. Med Phys 2008. [DOI: 10.1118/1.2962754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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de Boulois HD, Joner EJ, Leyval C, Jakobsen I, Chen BD, Roos P, Thiry Y, Rufyikiri G, Delvaux B, Declerck S. Role and influence of mycorrhizal fungi on radiocesium accumulation by plants. J Environ Radioact 2008; 99:785-800. [PMID: 18055077 DOI: 10.1016/j.jenvrad.2007.10.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/18/2007] [Indexed: 05/25/2023]
Abstract
This review summarizes current knowledge on the contribution of mycorrhizal fungi to radiocesium immobilization and plant accumulation. These root symbionts develop extended hyphae in soils and readily contribute to the soil-to-plant transfer of some nutrients. Available data show that ecto-mycorrhizal (ECM) fungi can accumulate high concentration of radiocesium in their extraradical phase while radiocesium uptake and accumulation by arbuscular mycorrhizal (AM) fungi is limited. Yet, both ECM and AM fungi can transport radiocesium to their host plants, but this transport is low. In addition, mycorrhizal fungi could thus either store radiocesium in their intraradical phase or limit its root-to-shoot translocation. The review discusses the impact of soil characteristics, and fungal and plant transporters on radiocesium uptake and accumulation in plants, as well as the potential role of mycorrhizal fungi in phytoremediation strategies.
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Affiliation(s)
- H Dupré de Boulois
- Université catholique de Louvain, Unité de Microbiologie, Croix du Sud 3, 1348 Louvain-la-Neuve, Belgium
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de Boulois HD, Joner EJ, Leyval C, Jakobsen I, Chen BD, Roos P, Thiry Y, Rufyikiri G, Delvaux B, Declerck S. Impact of arbuscular mycorrhizal fungi on uranium accumulation by plants. J Environ Radioact 2008; 99:775-784. [PMID: 18069098 DOI: 10.1016/j.jenvrad.2007.10.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/18/2007] [Indexed: 05/25/2023]
Abstract
Contamination by uranium (U) occurs principally at U mining and processing sites. Uranium can have tremendous environmental consequences, as it is highly toxic to a broad range of organisms and can be dispersed in both terrestrial and aquatic environments. Remediation strategies of U-contaminated soils have included physical and chemical procedures, which may be beneficial, but are costly and can lead to further environmental damage. Phytoremediation has been proposed as a promising alternative, which relies on the capacity of plants and their associated microorganisms to stabilize or extract contaminants from soils. In this paper, we review the role of a group of plant symbiotic fungi, i.e. arbuscular mycorrhizal fungi, which constitute an essential link between the soil and the roots. These fungi participate in U immobilization in soils and within plant roots and they can reduce root-to-shoot translocation of U. However, there is a need to evaluate these observations in terms of their importance for phytostabilization strategies.
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Affiliation(s)
- H Dupré de Boulois
- Université catholique de Louvain, Unité de Microbiologie, Croix du Sud 3, 1348 Louvain-la-Neuve, Belgium
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Vergouw C, Botros L, Roos P, Lens J, Schats R, Hompes P, Burns D, Lambalk C. Metabolomic profiling by near-infrared spectroscopy as a tool to assess embryo viability: a novel, non-invasive method for embryo selection. Hum Reprod 2008; 23:1499-504. [DOI: 10.1093/humrep/den111] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Armstrong DS, Arvieux J, Asaturyan R, Averett T, Bailey SL, Batigne G, Beck DH, Beise EJ, Benesch J, Bimbot L, Birchall J, Biselli A, Bosted P, Boukobza E, Breuer H, Carlini R, Carr R, Chant N, Chao YC, Chattopadhyay S, Clark R, Covrig S, Cowley A, Dale D, Davis C, Falk W, Finn JM, Forest T, Franklin G, Furget C, Gaskell D, Grames J, Griffioen KA, Grimm K, Guillon B, Guler H, Hannelius L, Hasty R, Allen AH, Horn T, Johnston K, Jones M, Kammel P, Kazimi R, King PM, Kolarkar A, Korkmaz E, Korsch W, Kox S, Kuhn J, Lachniet J, Lee L, Lenoble J, Liatard E, Liu J, Loupias B, Lung A, Marchand D, Martin JW, McFarlane KW, McKee DW, McKeown RD, Merchez F, Mkrtchyan H, Moffit B, Morlet M, Nakagawa I, Nakahara K, Neveling R, Ong S, Page S, Papavassiliou V, Pate SF, Phillips SK, Pitt ML, Poelker M, Porcelli TA, Quéméner G, Quinn B, Ramsay WD, Rauf AW, Real JS, Roche J, Roos P, Rutledge GA, Secrest J, Simicevic N, Smith GR, Spayde DT, Stepanyan S, Stutzman M, Sulkosky V, Tadevosyan V, Tieulent R, Van de Wiele J, van Oers WTH, Voutier E, Vulcan W, Warren G, Wells SP, Williamson SE, Wood SA, Yan C, Yun J, Zeps V. Transverse beam spin asymmetries in forward-angle elastic electron-proton scattering. Phys Rev Lett 2007; 99:092301. [PMID: 17930999 DOI: 10.1103/physrevlett.99.092301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2007] [Indexed: 05/25/2023]
Abstract
We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q2=0.15, 0.25 (GeV/c)2. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A(n) provides a direct probe of the imaginary component of the 2gamma exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.
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Affiliation(s)
- D S Armstrong
- Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA
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Affiliation(s)
- Gerhard E. Herberich
- Institut für Anorganische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, D‐5100 Aachen
| | - Ulli Englert
- Institut für Anorganische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, D‐5100 Aachen
| | - Klaus Linn
- Institut für Anorganische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, D‐5100 Aachen
| | - Peter Roos
- Institut für Anorganische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, D‐5100 Aachen
| | - Jan Runsink
- Institut für Organische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, D‐5100 Aachen
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Affiliation(s)
- Gerhard E. Herberich
- Institut für Anorganische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, W‐5100 Aachen
| | - Ullrich Englert
- Institut für Anorganische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, W‐5100 Aachen
| | - Peter Roos
- Institut für Anorganische Chemie der Technischen Hochschule Aachen, Professor‐Pirlet‐Straße 1, W‐5100 Aachen
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Armstrong DS, Arvieux J, Asaturyan R, Averett T, Bailey SL, Batigne G, Beck DH, Beise EJ, Benesch J, Bimbot L, Birchall J, Biselli A, Bosted P, Boukobza E, Breuer H, Carlini R, Carr R, Chant N, Chao YC, Chattopadhyay S, Clark R, Covrig S, Cowley A, Dale D, Davis C, Falk W, Finn JM, Forest T, Franklin G, Furget C, Gaskell D, Grames J, Griffioen KA, Grimm K, Guillon B, Guler H, Hannelius L, Hasty R, Hawthorne Allen A, Horn T, Johnston K, Jones M, Kammel P, Kazimi R, King PM, Kolarkar A, Korkmaz E, Korsch W, Kox S, Kuhn J, Lachniet J, Lee L, Lenoble J, Liatard E, Liu J, Loupias B, Lung A, MacLachlan GA, Marchand D, Martin JW, McFarlane KW, McKee DW, McKeown RD, Merchez F, Mkrtchyan H, Moffit B, Morlet M, Nakagawa I, Nakahara K, Nakos M, Neveling R, Niccolai S, Ong S, Page S, Papavassiliou V, Pate SF, Phillips SK, Pitt ML, Poelker M, Porcelli TA, Quéméner G, Quinn B, Ramsay WD, Rauf AW, Real JS, Roche J, Roos P, Rutledge GA, Secrest J, Simicevic N, Smith GR, Spayde DT, Stepanyan S, Stutzman M, Sulkosky V, Tadevosyan V, Tieulent R, van de Wiele J, van Oers W, Voutier E, Vulcan W, Warren G, Wells SP, Williamson SE, Wood SA, Yan C, Yun J, Zeps V. Strange-quark contributions to parity-violating asymmetries in the forward g0 electron-proton scattering experiment. Phys Rev Lett 2005; 95:092001. [PMID: 16197209 DOI: 10.1103/physrevlett.95.092001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2005] [Indexed: 05/04/2023]
Abstract
We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 < or =Q2 < or =1.0 GeV2. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange-quark contributions to the currents of the proton. The measurements were made at Jefferson Laboratory using a toroidal spectrometer to detect the recoiling protons from a liquid hydrogen target. The results indicate nonzero, Q2 dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.
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Affiliation(s)
- D S Armstrong
- Department of Physics, College of William and Mary, Williamsburg, VA 23187, USA
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Abstract
Diaphragmatic weakness in patients with systemic lupus erythematosus (SLE) is a controversial issue and is claimed to have a neuropathic, myopathic or unknown pathogenesis. In this patient a predominantly motor neuropathy with diaphragmatic paralysis due to axonal involvement of the phrenic nerve was discovered and successfully treated with immunosuppressive drugs.
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Affiliation(s)
- R Omdal
- Clinical Immunology Unit, Department of Internal Medicine, Rogaland Central Hospital, Stavanger, Norway.
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Roos P, Westling A, Chronakis IS. Hydrophilic monolayer formation of adsorbed cationic starch and cationic hydroxyethyl cellulose derivatives on polyester surfaces. Biosci Biotechnol Biochem 2004; 68:2247-56. [PMID: 15564661 DOI: 10.1271/bbb.68.2247] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Cationic starch, cationic cellulose derivatives, and hydrophobically modified cationic cellulose were physically adsorbed from aqueous solution onto oppositely charged hydrophobic polyester (poly(ethylene terephthalate)) fabric and nonwoven, and this resulted in hydrophilic surface properties. Surface coverage of the polysaccharides occurred primarily by strong electrostatic interactions, and the surface characteristics were evaluated by measuring the time required for a water droplet to be absorbed into the polyester material as well as by electron spectroscopy for chemical analysis (ESCA). From a comparison of the adsorption characteristics we assess the polysaccharide-dependent and substrate-dependent adsorption behavior and discuss the similarities and differences in the hydrophilic properties and wettability observed. In particular, the temperature of the cationic polysaccharide solutions in which the substrate was immersed, the configuration of the polymer in solution, and the presence of hydrophobic substituents on the cationic moiety have a considerable effect on the polysaccharide affinity and its adsorption on the surface, irrespective of the substrate type (fabric or nonwoven). We also evaluate the relative contribution of the polyelectrolyte molecular weight, concentration in solution, and degree of charge density along the polymer chain which determine the range of interactions and alter surface hydroplilicity dependent on the type of substrate.
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Affiliation(s)
- Peter Roos
- IFP Research, Swedish Institute for Fiber and Polymer Research, Mölndal, Sweden
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Joner EJ, Roos P, Jansa J, Frossard E, Leyval C, Jakobsen I. No significant contribution of arbuscular mycorrhizal fungi to transfer of radiocesium from soil to plants. Appl Environ Microbiol 2004; 70:6512-7. [PMID: 15528513 PMCID: PMC525231 DOI: 10.1128/aem.70.11.6512-6517.2004] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2004] [Accepted: 06/22/2004] [Indexed: 11/20/2022] Open
Abstract
The diffuse pollution by fission and activation products following nuclear accidents and weapons testing is of major public concern. Among the nuclides that pose a serious risk if they enter the human food chain are the cesium isotopes 137Cs and 134Cs (with half-lives of 30 and 2 years, respectively). The biogeochemical cycling of these isotopes in forest ecosystems is strongly affected by their preferential absorption in a range of ectomycorrhiza-forming basidiomycetes. An even more widely distributed group of symbiotic fungi are the arbuscular mycorrhizal fungi, which colonize most herbaceous plants, including many agricultural crops. These fungi are known to be more efficient than ectomycorrhizas in transporting mineral elements from soil to plants. Their role in the biogeochemical cycling of Cs is poorly known, in spite of the consequences that fungal Cs transport may have for transfer of Cs into the human food chain. This report presents the first data on transport of Cs by these fungi by use of radiotracers and compartmented growth systems where uptake by roots and mycorrhizal hyphae is distinguished. Independent experiments in three laboratories that used different combinations of fungi and host plants all demonstrated that these fungi do not contribute significantly to plant uptake of Cs. The implications of these findings for the bioavailability of radiocesium in different terrestrial ecosystems are discussed.
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Affiliation(s)
- E J Joner
- LIMOS-CNRS, UMR 7137 CNRS-UHP, Faculty of Sciences, H. Poincaré University Nancy 1, Vandoeuvre-les-Nancy, France.
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Roos P, Li X, Pipis J, Cundiff S. Solid-state carrier-envelope-phase noise measurements with intrinsically balanced detection. Opt Express 2004; 12:4255-4260. [PMID: 19483971 DOI: 10.1364/opex.12.004255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We use interference between single- and two-photon photocurrent generation pathways in a semiconductor to measure the out-of-loop carrier-envelope-phase noise of a stabilized Ti:sapphire modelocked laser. This solid-state measurement technique exhibits no significant amplitude/phase coupling, adds no measurable phase noise compared to the standard self-referencing technique, and requires few optical components. The method features a built-in balanced detection mechanism that is particularly appealing for dc carrier-envelope-phase measurements.
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Eriksson M, Holm E, Roos P, Dahlgaard H. Distribution and flux of 238Pu, 239,240Pu, 241Am, 137Cs and 210Pb to high arctic lakes in the Thule district (Greenland). J Environ Radioact 2004; 75:285-299. [PMID: 15193794 DOI: 10.1016/j.jenvrad.2003.12.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2001] [Revised: 11/27/2003] [Accepted: 12/14/2003] [Indexed: 05/24/2023]
Abstract
Environmental samples (soil, sediment and lake water) in the Thule area (NW Greenland) have been studied to assess the contamination of radionuclides originating from a nuclear weapons accident (the Thule accident in 1968). Four lakes were chosen at different distances from the point of impact with the Thule air base community situated in between. The sedimentation rates in the lakes varied from 0.4 mm a(-1) (5 mg cm(-2) a(-1)) to 1.6 mm a(-1) (82 mg cm(-2) a(-1)). With these sedimentation rates, it is not possible to resolve the (239,240)Pu global fallout peak from a possible (239,240)Pu "accident" peak in the sediment depth profiles. However, the (239,240)Pu/(137)Cs and the (238)Pu/(239,240)Pu ratios agreed well with global fallout ratios, indicating that plutonium originating from the accident had not reached these lakes. This also indicates that the Thule air base community has probably only been exposed to radionuclides from the accident to a very limited extent. A limited study showed that (210)Pb could not be used as a normalizing nuclide to explain the transport of transuranic elements from the catchment area to the lake, i.e. (210)Pb has a different transport mechanism from that of the transuranic elements studied in this investigation.
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Affiliation(s)
- M Eriksson
- Risø National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark.
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Roos P, Quraishi Q, Cundiff S, Bhat R, Sipe J. Characterization of quantum interference control of injected currents in LT-GaAs for carrier-envelope phase measurements. Opt Express 2003; 11:2081-2090. [PMID: 19466094 DOI: 10.1364/oe.11.002081] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We use two mutually coherent, harmonically related pulse trains to experimentally characterize quantum interference control (QIC) of injected currents in low-temperature-grown gallium arsenide. We observe real-time QIC interference fringes, optimize the QIC signal fidelity, uncover critical signal dependences regarding beam spatial position on the sample, measure signal dependences on the fundamental and second harmonic average optical powers, and demonstrate signal characteristics that depend on the focused beam spot sizes. Following directly from our motivation for this study, we propose an initial experiment to measure and ultimately control the carrier-envelope phase evolution of a single octave-spanning pulse train using the QIC phenomenon.
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Lindahl P, Ellmark C, Gäfvert T, Mattsson S, Roos P, Holm E, Erlandsson B. Long-term study of 99Tc in the marine environment on the Swedish west coast. J Environ Radioact 2003; 67:145-156. [PMID: 12660046 DOI: 10.1016/s0265-931x(02)00176-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The activity concentration of (99)Tc in brown seaweed (Fucus vesiculosus and Fucus serratus) and seawater were analysed in samples collected in 1991, 1995 and 2001 at several stations along the Swedish west coast. In addition to these locations, a well-defined site (Särdal, 56.76 degrees N, 12.63 degrees E) was included with (99)Tc activity concentration data in seaweed from 1967 to 2000. Over the years, the major source of (99)Tc in the coastal waters of western Sweden has been the radioactive liquid discharge from the nuclear fuel reprocessing plant in Sellafield (UK) transported via ocean currents in the North Sea. The (99)Tc activity concentration in seaweed at the Särdal site increased from approximately 30 Bq kg(-1) up to 230 Bq kg(-1) (dry weight) between 1997 and 2000 due to the Sellafield EARP (Enhanced Actinide Removal Plant) discharges in 1995-1996, yielding an approximate transport time of 4-5 years between the Irish Sea and the Kattegat. Due to the very sharp gradient in (99)Tc concentration between the Baltic Sea and the North Sea, (99)Tc is presently one of the best transit tracers for the recent ventilation events in the Baltic Sea.
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Affiliation(s)
- P Lindahl
- Department of Radiation Physics, Lund University Hospital, S-221 85 Lund, Sweden.
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Vintró LL, McMahon CA, Mitchell PI, Josefsson D, Holm E, Roos P. Transport of plutonium in surface and sub-surface waters from the Arctic shelf to the North Pole via the Lomonosov Ridge. J Environ Radioact 2002; 60:73-89. [PMID: 11936615 DOI: 10.1016/s0265-931x(01)00097-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
New data on the levels and long-range transport of plutonium in the Arctic Ocean, recorded in the course of two expeditions to this zone in 1994 and 1996, are discussed in this paper. Specifically, approximately 100 plutonium measurements in surface and sub-surface water sampled at 58 separate stations throughout the Kara, Laptev and East Siberian Seas, as well as along latitudinal transects across the Lomonosov Ridge, are reported and interpreted in terms of the circulation pathways responsible for the transport of this element from the North Atlantic to the Arctic Shelf and into the Arctic interior. In addition, the behaviour of plutonium in its transit through the vast Arctic shelf seas to open waters under extreme environmental conditions is discussed in terms of the partitioning of plutonium between filtered (<0.45 microm) seawater and suspended particulate, and its association with colloidal matter. Finally, limited evidence of the presence of a colloidal plutonium component in Arctic waters subject to direct riverine input is adduced.
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Affiliation(s)
- L León Vintró
- Department of Experimental Physics, National University of Ireland, Dublin, Belfield.
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