1
|
Bertin A, Kiefer L, Becker P, Bohatý L, Braden M. Rotational phase transitions in antifluorite-type osmate and iridate compounds. J Phys : Condens Matter 2024; 36:245402. [PMID: 38437717 DOI: 10.1088/1361-648x/ad2fef] [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] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 03/04/2024] [Indexed: 03/06/2024]
Abstract
We present temperature-dependent single-crystal diffraction results on seven antifluorite-typeA2MeX6compounds withMe= Os or Ir: K2OsCl6,A2OsBr6withA= K, Rb, Cs and NH4, and K2IrX6withX= Cl and Br. The structural transitions in this family arise fromMeX6octahedron rotations that generate a rich variety of symmetries depending on the rotation axis and stacking schemes. In order to search for local distortions in the high-symmetry phase we perform refinements of anharmonic atomic displacement parameters with comprehensive data sets. Even at temperatures close to the onset of structural distortions, these refinements only yield a small improvement indicating only small anharmonic effects. The phase transitions in these antifluorites are essentially of displacive character. However, some harmonic displacement parameters are very large reflecting soft phonon modes with the softening covering large parts of the Brillouin zone. The occurrence of the rotational transitions in the antifluorite-type family can be remarkably well analyzed in terms of a tolerance factor of ionic radii.
Collapse
Affiliation(s)
- A Bertin
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany
| | - L Kiefer
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany
| | - P Becker
- Sect. Crystallography, Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
| | - L Bohatý
- Sect. Crystallography, Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany
| | - M Braden
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany
| |
Collapse
|
2
|
Behr S, Fenski F, Boettcher J, Knaevelsrud C, Hammelrath L, Kovacs G, Schirmer W, Petrick H, Becker P, Schaeuffele C. TONI - One for all? Participatory development of a transtheoretic and transdiagnostic online intervention for blended care. Internet Interv 2024; 35:100723. [PMID: 38370289 PMCID: PMC10874715 DOI: 10.1016/j.invent.2024.100723] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 12/13/2023] [Accepted: 02/02/2024] [Indexed: 02/20/2024] Open
Abstract
Background Internet-based interventions offer a way to meet the high demand for psychological support. However, this setting also has disadvantages, such as the lack of personal contact and the limited ability to respond to crises. Blended care combines Internet-based interventions with face-to-face psychotherapy and merges the benefits of both settings. To ensure the uptake of blended care in routine care, Internet-based interventions need to be suitable for different therapeutic approaches and mental disorders. Objective This paper describes the participatory development process of the Internet-based intervention "TONI" using a common therapeutic language and content on various transdiagnostic topics to be integrated into routine outpatient psychotherapy. Methods To develop this intervention in a participatory manner, we followed the Integrate, Design, Assess, and Share (IDEAS) framework. In a multilevel development process, we used a combination of interviews, focus groups, and proofreading to optimally tailor online modules to routine outpatient psychotherapy. Building on well-established cognitive-behavioral online content, we included expert interviews with psychodynamic (n = 20) and systemic psychotherapists (n = 9) as well as focus groups with psychotherapists of different approaches (n = 10) and persons with lived experience of mental illness (PWLE; n = 10). Results We describe the development process of TONI step-by-step, outlining the specific requirements that therapists from different therapeutic approaches as well as PWLE have and how we implemented them in our intervention. This includes the content and specific exercises in the online modules, aspects of data protection, language, design, and usability. Conclusion Internet-based interventions that use a common therapeutic language and address therapeutic principles across different approaches have the potential to advance digitalization in psychotherapy. Involving psychotherapists and PWLE in intervention development may positively impact acceptance and usage in practice. This study shows how participatory intervention development involving both psychotherapists and PWLE can be carried out.
Collapse
Affiliation(s)
- S. Behr
- Department of Education and Psychology, Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany
| | - F. Fenski
- Department of Psychology and Psychotherapy, Psychologische Hochschule Berlin, Am Köllnischen Park 2, 10179 Berlin, Germany
| | - J. Boettcher
- Department of Psychology and Psychotherapy, Psychologische Hochschule Berlin, Am Köllnischen Park 2, 10179 Berlin, Germany
| | - C. Knaevelsrud
- Department of Education and Psychology, Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany
| | - L. Hammelrath
- Department of Education and Psychology, Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany
| | - G. Kovacs
- Berlin School of Design and Communications, SRH Berlin University of Applied Sciences, Prinzenstraße 84.1, 10969 Berlin, Germany
| | - W. Schirmer
- Department of Education and Psychology, Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany
| | - H. Petrick
- Department of Education and Psychology, Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany
| | - P. Becker
- Department of Psychology and Psychotherapy, Psychologische Hochschule Berlin, Am Köllnischen Park 2, 10179 Berlin, Germany
| | - C. Schaeuffele
- Department of Education and Psychology, Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany
| |
Collapse
|
3
|
Gao L, Keller FM, Becker P, Dahmen A, Lippke S. Predictors of Dropout Among Psychosomatic Rehabilitation Patients During the COVID-19 Pandemic: Secondary Analysis of a Longitudinal Study of Digital Training. J Med Internet Res 2023; 25:e43584. [PMID: 37903289 PMCID: PMC10683786 DOI: 10.2196/43584] [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] [Received: 10/16/2022] [Revised: 09/29/2023] [Accepted: 10/11/2023] [Indexed: 11/01/2023] Open
Abstract
BACKGROUND High dropout rates are a common problem reported in web-based studies. Understanding which risk factors interrelate with dropping out from the studies provides the option to prevent dropout by tailoring effective strategies. OBJECTIVE This study aims to contribute an understanding of the predictors of web-based study dropout among psychosomatic rehabilitation patients. We investigated whether sociodemographics, voluntary interventions, physical and mental health, digital use for health and rehabilitation, and COVID-19 pandemic-related variables determine study dropout. METHODS Patients (N=2155) recruited from 4 psychosomatic rehabilitation clinics in Germany filled in a web-based questionnaire at T1, which was before their rehabilitation stay. Approximately half of the patients (1082/2155, 50.21%) dropped out at T2, which was after the rehabilitation stay, before and during which 3 voluntary digital trainings were provided to them. According to the number of trainings that the patients participated in, they were categorized into a comparison group or 1 of 3 intervention groups. Chi-square tests were performed to examine the differences between dropout patients and retained patients in terms of sociodemographic variables and to compare the dropout rate differences between the comparison and intervention groups. Logistic regression analyses were used to assess what factors were related to study dropout. RESULTS The comparison group had the highest dropout rate of 68.4% (173/253) compared with the intervention groups' dropout rates of 47.98% (749/1561), 50% (96/192), and 42.9% (64/149). Patients with a diagnosis of combined anxiety and depressive disorder had the highest dropout rate of 64% (47/74). Younger patients (those aged <50 y) and patients who were less educated were more likely to drop out of the study. Patients who used health-related apps and the internet less were more likely to drop out of the study. Patients who remained in their jobs and patients who were infected by COVID-19 were more likely to drop out of the study. CONCLUSIONS This study investigated the predictors of dropout in web-based studies. Different factors such as patient sociodemographics, physical and mental health, digital use, COVID-19 pandemic correlates, and study design can correlate with the dropout rate. For web-based studies with a focus on mental health, it is suggested to consider these possible dropout predictors and take appropriate steps to help patients with a high risk of dropping out overcome difficulties in completing the study.
Collapse
Affiliation(s)
- Lingling Gao
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
| | - Franziska Maria Keller
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
| | | | - Alina Dahmen
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
- Klinikum Wolfsburg, Wolfsburg, Germany
| | - Sonia Lippke
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
| |
Collapse
|
4
|
Derksen C, Rinn R, Gao L, Dahmen A, Cordes C, Kolb C, Becker P, Lippke S. Longitudinal Evaluation of an Integrated Post-COVID-19/Long COVID Management Program Consisting of Digital Interventions and Personal Support: Randomized Controlled Trial. J Med Internet Res 2023; 25:e49342. [PMID: 37792437 PMCID: PMC10563866 DOI: 10.2196/49342] [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] [Received: 05/25/2023] [Revised: 07/31/2023] [Accepted: 09/06/2023] [Indexed: 10/05/2023] Open
Abstract
BACKGROUND The postacute COVID-19 syndrome (PACS) can be addressed with multidisciplinary approaches, including professional support and digital interventions. OBJECTIVE This research aimed to test whether patients who received a health care facilitation program including medical internet support from human personal pilots and digital interventions (intervention group [IG] and active control group [ACG]) would experience fewer symptoms and have higher work ability and social participation than an untreated comparison group (CompG). The second objective was to compare the impact of a diagnostic assessment and digital interventions tailored to patients' personal capacity (IG) with that of only personal support and digital interventions targeting the main symptoms (ACG). METHODS In total, 1020 patients with PACS were recruited. Using a randomized controlled trial design between the IG and the ACG, as well as propensity score matching to include the CompG, analyses were run with logistic regression and hierarchical-linear models. RESULTS Symptoms decreased significantly in all groups over time (βT1-T2=0.13, t549=5.67, P<.001; βT2-T4=0.06, t549=2.83, P=.01), with a main effect of the group (β=-.15, t549=-2.65, P=.01) and a more pronounced effect in the IG and ACG compared to the CompG (between groups: βT1-T2=0.14, t549=4.31, P<.001; βT2-T4=0.14, t549=4.57, P<.001). Work ability and social participation were lower in the CompG, but there was no significant interaction effect. There were no group differences between the IG and the ACG. CONCLUSIONS Empowerment through personal pilots and digital interventions reduces symptoms but does not increase work ability and social participation. More longitudinal research is needed to evaluate the effects of a diagnostic assessment. Social support and digital interventions should be incorporated to facilitate health care interventions for PACS. TRIAL REGISTRATION ClinicalTrials.gov NCT05238415; https://classic.clinicaltrials.gov/ct2/show/NCT05238415. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) RR2-10.1186/s12879-022-07584-z.
Collapse
Affiliation(s)
- Christina Derksen
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
- Wolfson Institute of Population Health, Queen Mary University of London, London, United Kingdom
| | - Robin Rinn
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
| | - Lingling Gao
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
| | - Alina Dahmen
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
| | - Cay Cordes
- Dr. Becker Kiliani-Klinik, Dr. Becker Klinikgruppe, Bad Windsheim, Germany
| | | | | | - Sonia Lippke
- Health Psychology and Behavioural Medicine, Constructor University Bremen, Bremen, Germany
| |
Collapse
|
5
|
Becker P, Rask M, Safipour J, Gunnarsson AB. Selfcare Strategies Shown to Be Useful in Daily Life for Adults Diagnosed with Attention Deficit Hyperactivity Disorder - A Systematic Review. Issues Ment Health Nurs 2023; 44:825-833. [PMID: 37669505 DOI: 10.1080/01612840.2023.2234477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
Adults with ADHD experience a wide range of difficulties in daily life, and RNs and other healthcare professionals need to know how to support them. The aim was to conduct a systematic review of which selfcare strategies adults with ADHD use and need in order to manage daily life. A literature review based on the PRISMA model was performed, and seven articles with a qualitative design were found. Data were analyzed with thematic analysis. The analysis generated one major theme Enabling ways to manage the consequences of disability in daily life based on three subthemes; Establishing ways of acting to help yourself, Finding encouraging and helping relationships, and Using external aids for managing daily life. Professionals may benefit from knowing about these selfcare strategies when meeting people with ADHD.
Collapse
Affiliation(s)
- Petra Becker
- Department of Research and Development, Region Kronoberg, Växjö, Sweden
- Department of Health and Caring Sciences, Faculty of Health and Life Sciences, Linnaeus University, Växjö, Sweden
| | - Mikael Rask
- Department of Health and Caring Sciences, Faculty of Health and Life Sciences, Linnaeus University, Växjö, Sweden
| | - Jalal Safipour
- Department of Health and Caring Sciences, Faculty of Health and Life Sciences, Linnaeus University, Växjö, Sweden
| | - A Birgitta Gunnarsson
- Department of Research and Development, Region Kronoberg, Växjö, Sweden
- Institute of Neuroscience and Physiology, Department of Health and Rehabilitation, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| |
Collapse
|
6
|
Imbert S, Normand AC, Costa D, Gabriel F, Lachaud L, Schuttler C, Cassaing S, Mahinc C, Hasseine L, Demar M, Brun S, Bonnal C, Moreno-Sabater A, Becker P, Piarroux R, Fekkar A. Multicentric Analysis of the Species Distribution and Antifungal Susceptibility of Clinical Isolates from Aspergillus Section Circumdati. Antimicrob Agents Chemother 2023; 67:e0146222. [PMID: 36892306 PMCID: PMC10112188 DOI: 10.1128/aac.01462-22] [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] [Received: 10/31/2022] [Accepted: 02/05/2023] [Indexed: 03/10/2023] Open
Abstract
The clinical involvement and antifungal susceptibility of Aspergillus section Circumdati are poorly known. We analyzed 52 isolates, including 48 clinical isolates, belonging to 9 species inside the section Circumdati. The whole section exhibited, by the EUCAST reference method, a poor susceptibility to amphotericin B, but species/series-specific patterns were observed for azole drugs. This underlines the interest in getting an accurate identification inside the section Circumdati to guide the choice of antifungal treatment in clinical practice.
Collapse
Affiliation(s)
- S. Imbert
- AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Service de Parasitologie Mycologie, Paris, France
- Sorbonne Université, Inserm, CNRS, Centre d’Immunologie et des Maladies Infectieuses, Paris, France
| | - A. C. Normand
- AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Service de Parasitologie Mycologie, Paris, France
| | - D. Costa
- Centre Hospitalier Universitaire de Rouen, Service de Parasitologie Mycologie, Rouen, France
| | - F. Gabriel
- Centre Hospitalier Universitaire de Bordeaux, Service de Parasitologie Mycologie, Bordeaux, France
| | - L. Lachaud
- Centre Hospitalier Universitaire de Montpellier, Service de Parasitologie Mycologie, Montpellier, France
| | | | - S. Cassaing
- Centre Hospitalier Universitaire de Toulouse, Service de Parasitologie Mycologie, Toulouse, France
| | - C. Mahinc
- Centre Hospitalier Universitaire de Saint Etienne, Service de Parasitologie Mycologie, Saint Etienne, France
| | - L. Hasseine
- Centre Hospitalier Universitaire de Nice, Service de Parasitologie Mycologie, Nice, France
| | - M. Demar
- Centre Hospitalier de Cayenne, Département de Parasitologie Mycologie, Cayenne, French Guiana
| | - S. Brun
- AP-HP, Hôpital Avicenne, Service de Parasitologie Mycologie, Bobigny, France
| | - C. Bonnal
- AP-HP, Hôpital Bichat-Claude Bernard, Service de Parasitologie Mycologie, Paris, France
| | - A. Moreno-Sabater
- AP-HP, Hôpital Saint-Antoine, Service de Parasitologie Mycologie, Paris, France
| | - P. Becker
- Service of Mycology and Aerobiology, BCCM/IHEM Fungal Collection, Brussels, Belgium
| | - R. Piarroux
- AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Service de Parasitologie Mycologie, Paris, France
| | - A. Fekkar
- AP-HP, Groupe Hospitalier La Pitié-Salpêtrière, Service de Parasitologie Mycologie, Paris, France
- Sorbonne Université, Inserm, CNRS, Centre d’Immunologie et des Maladies Infectieuses, Paris, France
| |
Collapse
|
7
|
Rinn R, Gao L, Schoeneich SM, Dahmen A, Anand-Kumar V, Becker P, Lippke S. A Scoping Review of Digital Interventions that Treat Post-/Long-COVID. J Med Internet Res 2023; 25:e45711. [PMID: 36943909 PMCID: PMC10131666 DOI: 10.2196/45711] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/28/2023] [Accepted: 03/10/2023] [Indexed: 03/12/2023] Open
Abstract
BACKGROUND Patients with Post-/Long-COVID need support, and health care professionals require evidence-based patient care. Digital interventions can meet these requirements, especially if personal contact is limited. OBJECTIVE We reviewed evidence-based digital interventions, to help manage physical and mental health, for patients with Post-/Long-COVID. METHODS A scoping review was carried out; summarizing novel digital health interventions for treating Post-/Long-COVID patients. Using the PICO scheme, original studies were summarized in which patients with Post-/Long-COVID symptoms used digital interventions to help aid recovery. RESULTS From all scanned articles, k = 8 original studies matched the inclusion criteria. Three were "pre-test" studies. Three describe the implementation of a tele-rehabilitation program, one is a Post-/Long-COVID program, and one study describes the results of qualitative interviews with patients who used an online peer support group. Following the PICO scheme, we categorized previous studies: studies varied in terms of (P) participants, ranging from adults in different countries, such as former hospitalized patients with COVID-19, to disadvantaged communities in the UK, as well as health-care workers. In addition, the studies included patients who had previously been infected with COVID-19, who had ongoing symptoms, and some studies focused on specific symptoms, some post-COVID-19 or long-term. Other studies included patients in online peer support groups. The (I) interventions also varied. Most interventions used a combination of psychological and physical exercises, but they varied in duration, frequency, and social dimensions. The reviewed studies investigated physical and mental health (C) conditions of patients with Post-/Long-COVID. Most studies reported (O) outcomes/ improvements in physiological health perception, some physical conditions, fatigue, and some psychological aspects such as depression. However, some studies found no improvements in bowel/bladder problems, concentration, short-term memory, unpleasant dreams, physical ailments, perceived bodily pain, emotional ailments, and perceived mental health. CONCLUSIONS More systematic research with larger sample sizes is required to overcome sampling bias and include the health care professionals' perspective as well as help patients mobilize support by health care professionals and social network partners. The evidence so far suggests that patients should be provided with digital interventions to manage symptoms and reintegrate into everyday life, including work. CLINICALTRIAL
Collapse
Affiliation(s)
- Robin Rinn
- Constructor University, Constructor University, Campus Ring 1, Bremen, DE
- Julius-Maximilians-Universität, Lehrstuhl für Psychologie 2, Röntgenring 10, Würzburg, DE
| | - Lingling Gao
- Constructor University, Constructor University, Campus Ring 1, Bremen, DE
| | | | - Alina Dahmen
- Klinikum Wolfsburg, Wolfsburg, DE
- Constructor University, Constructor University, Campus Ring 1, Bremen, DE
- Dr. Becker Klinikgruppe, Bad Windsheim, DE
| | | | | | - Sonia Lippke
- Constructor University, Constructor University, Campus Ring 1, Bremen, DE
| |
Collapse
|
8
|
Fischer K, Grob L, Kuganathan S, Utz C, Becker P, Oeri S, Jung B, Gräni C, Huber A, Guensch D. FEASIBILITY OF NEW CMR POST-PROCESSING SOFTWARE PROTOTYPES IN ASSESSING THE RIGHT HEART AND TRICUSPID FUNCTION. J Cardiothorac Vasc Anesth 2022. [DOI: 10.1053/j.jvca.2022.09.017] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
|
9
|
Becker P, Kady F, Mongeon F, Friedrich M, Dominik G. TRANSTHORACIC SHOCKS LEAD TO REGIONAL BI-VENTRICULAR DIASTOLIC DYSFUNCTION IN TERRITORIES WITH ACUTE MYOCARDIAL INJURY. J Cardiothorac Vasc Anesth 2022. [DOI: 10.1053/j.jvca.2022.09.070] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
|
10
|
Dahmen A, Keller FM, Derksen C, Rinn R, Becker P, Lippke S. Screening and assessment for post-acute COVID-19 syndrome (PACS), guidance by personal pilots and support with individual digital trainings within intersectoral care: a study protocol of a randomized controlled trial. BMC Infect Dis 2022; 22:693. [PMID: 35971066 PMCID: PMC9377288 DOI: 10.1186/s12879-022-07584-z] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 06/30/2022] [Indexed: 11/14/2022] Open
Abstract
Background Because the clinical patterns and symptoms that persist after a COVID-19 infection are diverse, a diagnosis of post-acute COVID-19 syndrome (PACS) is difficult to implement. The current research project therefore aims to evaluate the feasibility and the practicability of a comprehensive, interdisciplinary, and cross-sectoral treatment program consisting of a low-threshold online screening and holistic assessment for PACS. Furthermore, it aims to evaluate digital interventions and the use of so-called personal guides that may help to facilitate the recovery of PACS. Methods This German study consists of a low-threshold online screening for PACS where positively screened participants will be supported throughout by personal pilots. The personal pilots are aimed at empowering patients and helping them to navigate through the study and different treatment options. Patients will then be randomly assigned either to an intervention group (IG) or an active control group (ACG). The IG will receive a comprehensive assessment of physiological and psychological functioning to inform future treatment. The ACG does not receive the assessment but both groups will receive a treatment consisting of an individual digital treatment program (digital intervention platform and an intervention via a chatbot). This digital intervention is based on the needs identified during the assessment for participants in the IG. Compared to that, the ACG will receive a more common digital treatment program aiming to reduce PACS symptoms. Importantly, a third comparison group (CompG) will be recruited that does not receive any treatment. A propensity score matching will take place, ensuring comparability between the participants. Primary endpoints of the study are symptom reduction and return to work. Secondary outcomes comprise, for example, social participation and activities in daily life. Furthermore, the feasibility and applicability of the online screening tool, the holistic assessment, digital trainings, and personal pilots will be evaluated. Discussion This is one of the first large-scale studies to improve the diagnosis and the care of patients with PACS by means of empowerment. It is to be evaluated whether the methods utilized can be used for the German and international population. Trial registration ClinicalTrials.gov Identifier: NCT05238415; date of registration: February 14, 2022 Supplementary Information The online version contains supplementary material available at 10.1186/s12879-022-07584-z.
Collapse
Affiliation(s)
- Alina Dahmen
- Klinikum Wolfsburg, Sauerbruchstraße 7, 38440, Wolfsburg, Germany.,Jacobs University Bremen gGmbH, Campus Ring 1, 28759, Bremen, Germany.,Dr. Becker Klinikgruppe, 50968, Cologne, Germany
| | | | - Christina Derksen
- Jacobs University Bremen gGmbH, Campus Ring 1, 28759, Bremen, Germany
| | - Robin Rinn
- Jacobs University Bremen gGmbH, Campus Ring 1, 28759, Bremen, Germany.,Julius-Maximilians-Universität, Röntgenring 10, 97070, Würzburg, Germany
| | - Petra Becker
- Dr. Becker Klinikgruppe, 50968, Cologne, Germany
| | - Sonia Lippke
- Jacobs University Bremen gGmbH, Campus Ring 1, 28759, Bremen, Germany.
| |
Collapse
|
11
|
Dahmen A, Gao L, Keller FM, Lehr D, Becker P, Lippke S. [Curriculum Hannover - Web-based vs. Analogue Psychotherapeutic aftercare after Psychosomatic Rehabilitation and vs. Care as Usual]. REHABILITATION 2022; 61:287-296. [PMID: 35995058 DOI: 10.1055/a-1872-9727] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
PURPOSE In order to maintain the effect achieved in the psychosomatic rehabilitation measure, psychosomatic rehabilitation aftercare is indicated for most rehabilitation patients. Due to the low availability of aftercare therapists close to home, the use of digital offers is a possibility to enable access independent of location. The aim of the study was to evaluate the therapeutic effects of web-based aftercare in comparison to face-to-face (F2F) therapy (both on the conceptual basis of the Curriculum Hannover) in the equivalence study and to no standardized aftercare (care as usual, CAU) in the superiority study. METHODS 300 rehabilitation patients with an indication for psychosomatic aftercare were assigned to the equivalence study if an aftercare service close to home was available and then randomized to F2F or online aftercare. Without a service close to home, the participants were assigned to the superiority study and randomized to online or CAU group. The outcomes (primary: psychological and somatoform complaints, secondary: subscales of the HEALTH-49, employment prognosis, ability to work) were assessed by online questionnaires at the end of rehabilitation, 9 or 12 and 15 or 18 months after rehabilitation and evaluated with multiple imputation and intention-to-treat-analyses. For the primary outcome, a sensitivity analysis was also carried out on the basis of the completed dataset. RESULTS After excluding non-adherent participants, n=142 participants were evaluated in the equivalence study and n=111 in the superiority study. In the equivalence study, no significant differences (d=0,28 and 0,10 with ITT-analyses; d=0,09 and 0,03 with completed dataset) were found between online and F2F follow-up with regard to short-term and long-term psychological and somatoform complaints. In the superiority study, long-term psychological and somatoform complaints decrease in the online group, while in the CAU group they first decreased at T2 (d=0,56) and increased again at T3 (d=0,72). The latter finding is confirmed with the analysis of the completed dataset (d=0,12), while an increase was seen in the online group at T3 (d=0,10). CONCLUSION According to the results of the present study, web-based psychosomatic aftercare seems to have a longer-term advantage for rehabilitants without access to previous aftercare. Compared to F2F implementation, it can be considered equivalent.
Collapse
Affiliation(s)
- Alina Dahmen
- Dr. Becker Klinikgruppe, Köln.,Jacobs University Bremen.,Klinikum Wolfsburg
| | | | | | | | | | | |
Collapse
|
12
|
Dahmen A, Gao L, Keller FM, Becker P, Lippke S. [For Which Patients is Web-Based Psychotherapeutic Aftercare after Psychosomatic Rehabilitation Most Suitable?]. Psychother Psychosom Med Psychol 2021; 72:235-242. [PMID: 34820818 DOI: 10.1055/a-1663-6747] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE In order to maintain the effects achieved during the psychosomatic rehabilitation, according aftercare is indicated for most rehabilitation patients. Due to the current low supply of aftercare psychotherapists (so-called aftercare therapists) licensed by the German Pension Insurance web-based aftercare provides an equivalent alternative to analogue (in person) offers. This study clarifies which characteristics indicate that web-based aftercare is particularly recommended and how web-based formats are evaluated by participants, especially with regard to the therapeutic relationship. METHODS 142 psychosomatic rehabilitation patients were randomly assigned to analogue aftercare or web-based aftercare if a service close to their home was available (equivalence study design). Test variables were collected by questionnaires and analyzed stratified for age and gender. RESULTS For male participants, there are no significant differences between the two aftercare formats. Women appear to have lower long-term depression scores when participating in web-based aftercare. Participants till the age 50 benefit significantly more from web-based aftercare than rehabilitants above age 50, The quality of the therapeutic relationship is rated equally well in both aftercare formats. DISCUSSION Particularly in view of the increasing digitization of healthcare in times of the corona pandemic, web-based aftercare services offer the possibility of providing patients with aftercare independent of the availability of analogue-services and with the same benefits as analog therapies. Demographic factors such as age and sex must be taken into account when determining the indication. CONCLUSION Therapists should recommend web-based aftercare especially for younger patients and for women, while men and older patients can be recommended both services equally. Therapists who offer web-based aftercare should be trained in advance on technical and content-related aspects, as was done in the present work.
Collapse
Affiliation(s)
| | - Lingling Gao
- Psychology & Methods, Jacobs University Bremen, Bremen, Deutschland
| | | | | | - Sonia Lippke
- Psychology & Methods, Jacobs University Bremen, Bremen, Deutschland
| |
Collapse
|
13
|
Lippke S, Gao L, Keller FM, Becker P, Dahmen A. Adherence With Online Therapy vs Face-to-Face Therapy and With Online Therapy vs Care as Usual: Secondary Analysis of Two Randomized Controlled Trials. J Med Internet Res 2021; 23:e31274. [PMID: 34730541 PMCID: PMC8600425 DOI: 10.2196/31274] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/26/2021] [Accepted: 09/13/2021] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Adherence to internet-delivered interventions targeting mental health such as online psychotherapeutic aftercare is important for the intervention's impact. High dropout rates limit the impact and generalizability of findings. Baseline differences may be putting patients at risk for dropping out, making comparisons between online with face-to-face (F2F) therapy and care as usual (CAU) necessary to examine. OBJECTIVE This study investigated adherence to online, F2F, and CAU interventions as well as study dropout among these groups and the subjective evaluation of the therapeutic relationship. Sociodemographic, social-cognitive, and health-related variables were considered. METHODS In a randomized controlled trial, 6023 patients were recruited, and 300 completed the baseline measures (T1), 144 completed T2 (retention 44%-52%), and 95 completed T3 (retention 24%-36%). Sociodemographic variables (eg, age, gender, marital status, educational level), social-cognitive determinants (eg, self-efficacy, social support), health-related variables (eg, depressiveness), and expectation towards the treatment for patients assigned to online or F2F were measured at T1. RESULTS There were no significant differences between the groups regarding dropout rates (χ21=0.02-1.06, P≥.30). Regarding adherence to the treatment condition, the online group outperformed the F2F and CAU conditions (P≤.01), indicating that patients randomized into the F2F and CAU control groups were much more likely to show nonadherent behavior in comparison with the online therapy groups. Within study groups, gender differences were significant only in the CAU group at T2, with women being more likely to drop out. At T3, age and marital status were also only significant in the CAU group. Patients in the online therapy group were significantly more satisfied with their treatment than patients in the F2F group (P=.02; Eta²=.09). Relationship satisfaction and success satisfaction were equally high (P>.30; Eta²=.02). Combining all study groups, patients who reported lower depressiveness scores at T1 (T2: odds ratio [OR] 0.55, 95% CI 0.35-0.87; T3: OR 0.56, 95% CI 0.37-0.92) were more likely to be retained, and patients who had higher self-efficacy (T2: OR 0.57, 95% CI 0.37-0.89; T3: OR 0.52, 95% CI 0.32-0.85) were more likely to drop out at T2 and T3. Additionally, at T3, the lower social support that patients reported was related to a higher likelihood of remaining in the study (OR 0.68, 95% CI 0.48-0.96). Comparing the 3 intervention groups, positive expectation was significantly related with questionnaire completion at T2 and T3 after controlling for other variables (T2: OR 1.64, 95% CI 1.08-2.50; T3: OR 1.59, 95% CI 1.01-2.51). CONCLUSIONS While online interventions have many advantages over F2F variants such as saving time and effort to commute to F2F therapy, they also create difficulties for therapists and hinder their ability to adequately react to patients' challenges. Accordingly, patient characteristics that might put them at risk for dropping out or not adhering to the treatment plan should be considered in future research and practice. Online aftercare, as described in this research, should be provided more often to medical rehabilitation patients. TRIAL REGISTRATION ClinicalTrials.gov NCT04989842; https://clinicaltrials.gov/ct2/show/NCT04989842.
Collapse
Affiliation(s)
- Sonia Lippke
- Department of Psychology and Methods, Jacobs University Bremen, Bremen, Germany
| | - Lingling Gao
- Department of Psychology and Methods, Jacobs University Bremen, Bremen, Germany
| | | | | | | |
Collapse
|
14
|
Gao L, Dahmen A, Keller FM, Becker P, Lippke S. The Mediation Effect of Phobic Anxiety on the Treatment Outcome of Activity and Participation across Age: Comparison between Online and Face-to-Face Rehabilitation Aftercare of an RCT. Int J Environ Res Public Health 2021; 18:10919. [PMID: 34682655 PMCID: PMC8536151 DOI: 10.3390/ijerph182010919] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 11/24/2022]
Abstract
The efficacy of internet and mobile-based interventions (IMIs) has been demonstrated with different mental health disorders, but little is known about the mediating effect of phobic anxiety on activity and participation and the differential effect of age. The current study tested a moderated mediation model with short-term change in phobic anxiety mediating between treatment (IMI vs. face-to-face, F2F) and long-term change in activity and participation, and age of patients moderating this mediation. Participants (N = 142) were recruited from psychosomatic rehabilitation clinics and randomized into the IMI psychosomatic aftercare or F2F psychosomatic aftercare. Moderated mediation analyses were conducted using R software. Results showed that the long-term treatment effects of activity and participation (βc = -0.18, p = 0.034; βc' = -0.13, p = 0.145) were improved through the successful decrease of phobic anxiety (βa = -0.18, p = 0.047; βb = 0.37, p = 0.010). Older patients benefited equally from both IMI and F2F interventions regarding short-term treatment change in phobic anxiety, while younger participants benefited more from IMI (βAge*Treatment = 0.20, p = 0.004). IMIs targeting mental disorders can improve activity and participation along with phobic anxiety, especially in younger individuals. The needs of older patients should be considered with the development and improvement of IMIs.
Collapse
Affiliation(s)
- Lingling Gao
- Department of Psychology & Methods, Jacobs University Bremen, 28759 Bremen, Germany; (L.G.); (A.D.); (F.M.K.)
| | - Alina Dahmen
- Department of Psychology & Methods, Jacobs University Bremen, 28759 Bremen, Germany; (L.G.); (A.D.); (F.M.K.)
- Dr. Becker Klinikgruppe, 50968 Cologne, Germany;
- Klinikum Wolfsburg, 38440 Wolfsburg, Germany
| | - Franziska Maria Keller
- Department of Psychology & Methods, Jacobs University Bremen, 28759 Bremen, Germany; (L.G.); (A.D.); (F.M.K.)
| | - Petra Becker
- Dr. Becker Klinikgruppe, 50968 Cologne, Germany;
| | - Sonia Lippke
- Department of Psychology & Methods, Jacobs University Bremen, 28759 Bremen, Germany; (L.G.); (A.D.); (F.M.K.)
| |
Collapse
|
15
|
Bohatý L, Lux O, Eichler H, Rhee H, Kaminskii AA, Becker P. Stimulated Raman Scattering (SRS) in α‐AlOOH (Diaspore). Crystal Research and Technology 2021. [DOI: 10.1002/crat.202100055] [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] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ladislav Bohatý
- Section Crystallography Institute of Geology and Mineralogy, University of Cologne 50939 Köln Germany
| | - Oliver Lux
- Institute of Optics and Atomic Physics Technical University of Berlin 10623 Berlin Germany
- Deutsches Zentrum für Luft‐ und Raumfahrt Institut für Physik der Atmosphäre 82234 Oberpfaffenhofen Germany
| | - Hans‐Joachim Eichler
- Institute of Optics and Atomic Physics Technical University of Berlin 10623 Berlin Germany
| | - Hanjo Rhee
- Institute of Optics and Atomic Physics Technical University of Berlin 10623 Berlin Germany
| | - Alexander A. Kaminskii
- Institute of Crystallography, Federal Scientific Center “Crystallography and Photonics” Russian Academy of Sciences Moscow 119333 Russia
| | - Petra Becker
- Section Crystallography Institute of Geology and Mineralogy, University of Cologne 50939 Köln Germany
| |
Collapse
|
16
|
Mitton B, Paruk F, Gous A, Chausse J, Milne M, Becker P, Said M. Investigating the need for therapeutic drug monitoring of imipenem in critically ill patients: Are we getting it right? S Afr Med J 2021; 111:903-909. [PMID: 34949257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Indexed: 06/14/2023] Open
Abstract
BACKGROUND The drug levels and clearances of imipenem in critically ill patients are not comprehensively described in current literature, yet it is vital that adequate levels be achieved for therapeutic success. OBJECTIVES To determine the proportion of critically ill patients treated with imipenem/cilastatin with sub-therapeutic imipenem plasma levels, and to compare the clinical outcomes of those patients with therapeutic levels with those who had sub-therapeutic levels. METHODS Trough imipenem plasma levels of 68 critically ill patients from a surgical intensive care unit were measured using a validated high-performance liquid chromatography method. Imipenem trough levels were compared with the minimum inhibitory concentration (MIC) of the causative bacterial agents, based on a target value of 100% time above MIC (¦T >MIC). RESULTS The proportion of participants with sub-therapeutic imipenem levels was 22% (95% confidence interval (CI) 13% - 34%). The 14- and 28-day mortality rates in the sub-therapeutic group were 33% and 40%, respectively, compared with 19% (p=0.293) and 26% (p=0.346), respectively, in the therapeutic group. Sub-therapeutic imipenem plasma levels are associated with adjusted hazard ratio of 1.47 (95% CI 0.55 - 3.91). CONCLUSIONS The lower proportion of critically ill patients with sub-therapeutic imipenem plasma levels in this study compared with previous studies may be attributed to the practice of higher dosages and the administration method of extended infusions of imipenem/cilastatin in our setting. The results demonstrate a trend of higher mortality in patients with sub-therapeutic imipenem levels, although the results were not statistically significant at this sample size.
Collapse
Affiliation(s)
- B Mitton
- Department of Medical Microbiology, Faculty of Health Sciences, University of Pretoria, South Africa; Tshwane Academic Division, National Health Laboratory Service, Pretoria, South Africa.
| | | | | | | | | | | | | |
Collapse
|
17
|
Kyprianidis A, Machado F, Morong W, Becker P, Collins KS, Else DV, Feng L, Hess PW, Nayak C, Pagano G, Yao NY, Monroe C. Observation of a prethermal discrete time crystal. Science 2021; 372:1192-1196. [PMID: 34112691 DOI: 10.1126/science.abg8102] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 04/30/2021] [Indexed: 11/02/2022]
Abstract
Extending the framework of statistical physics to the nonequilibrium setting has led to the discovery of previously unidentified phases of matter, often catalyzed by periodic driving. However, preventing the runaway heating that is associated with driving a strongly interacting quantum system remains a challenge in the investigation of these newly discovered phases. In this work, we utilize a trapped-ion quantum simulator to observe the signatures of a nonequilibrium driven phase without disorder-the prethermal discrete time crystal. Here, the heating problem is circumvented not by disorder-induced many-body localization, but rather by high-frequency driving, which leads to an expansive time window where nonequilibrium phases can emerge. Floquet prethermalization is thus presented as a general strategy for creating, stabilizing, and studying intrinsically out-of-equilibrium phases of matter.
Collapse
Affiliation(s)
- A Kyprianidis
- Joint Quantum Institute, Department of Physics, and Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA.
| | - F Machado
- Department of Physics, University of California, Berkeley, CA 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - W Morong
- Joint Quantum Institute, Department of Physics, and Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA
| | - P Becker
- Joint Quantum Institute, Department of Physics, and Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA
| | - K S Collins
- Joint Quantum Institute, Department of Physics, and Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA
| | - D V Else
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - L Feng
- Joint Quantum Institute, Department of Physics, and Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA
| | - P W Hess
- Department of Physics, Middlebury College, Middlebury, VT 05753, USA
| | - C Nayak
- Microsoft Quantum, Station Q, Santa Barbara, CA 93106, USA.,Department of Physics, University of California, Santa Barbara, CA 93106, USA
| | - G Pagano
- Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA
| | - N Y Yao
- Department of Physics, University of California, Berkeley, CA 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - C Monroe
- Joint Quantum Institute, Department of Physics, and Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA
| |
Collapse
|
18
|
Truter M, Karusseit VOL, Montwedi D, Becker P, Mokoena T. Leucocyte count and C-reactive protein cannot be relied upon in the diagnosis of acute appendicitis in HIV-infected patients. BJS Open 2021; 5:6073392. [PMID: 33609375 PMCID: PMC7893458 DOI: 10.1093/bjsopen/zraa016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 07/15/2020] [Accepted: 09/04/2020] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND South Africa has the highest prevalence of human immunodeficiency virus (HIV) infection in the world, and is commonly found in association with appendicitis. Atypical presentation of appendicitis in the presence of HIV infection makes clinical diagnosis of appendicitis unreliable, and inflammatory markers are commonly used as adjuncts. The aim of this study was ascertain the value of inflammatory markers in the diagnosis of appendicitis in patients with and without HIV infection. METHODS Patients with acute appendicitis were studied and divided into HIV-infected and HIV-uninfected groups. Symptoms, and systemic and local signs were recorded. Appendiceal pathology was classified as simple or as complicated by abscess, phlegmon or perforation. Total white cell count (WCC) and C-reactive protein (CRP) were chosen as inflammatory markers. Findings were compared between the two groups. RESULTS The study population consisted of 125 patients, of whom 26 (20.8 per cent) had HIV infection. Clinical manifestations did not differ statistically, and there was no difference in the incidence of simple or complicated appendicitis between the two groups. The mean CRP level was significantly higher in HIV-infected patients (194.9 mg/l versus 138.9 mg/l in HIV-uninfected patients; P = 0.049), and mean WCC (x109/L) was significantly lower (11.07 versus 14.17×109/l respectively; P = 0.010). CONCLUSION Clinical manifestations and pathology did not differ between HIV-infected and HIV-uninfected patients with appendicitis, except that the WCC response was significantly attenuated and CRP levels were generally higher in the presence of HIV infection.
Collapse
Affiliation(s)
- M Truter
- Department of Surgery, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - V O L Karusseit
- Department of Surgery, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - D Montwedi
- Department of Surgery, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - P Becker
- Research Office, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - T Mokoena
- Department of Surgery, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| |
Collapse
|
19
|
Nabet C, Imbert S, Normand AC, Blanchet D, Chanlin R, Becker P, Demar M, Piarroux R. Unexpected mould diversity in clinical isolates from French Guiana and associated identification difficulties. Med Mycol 2020; 59:myaa091. [PMID: 33111143 DOI: 10.1093/mmy/myaa091] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/05/2020] [Accepted: 10/12/2020] [Indexed: 12/14/2022] Open
Abstract
New mold species are increasingly reported in invasive fungal infections. However, these fungi are often misdiagnosed or undiagnosed due to the use of inappropriate laboratory diagnostic tools. Tropical countries, such as French Guiana, harbor a vast diversity of environmental fungi representing a potential source of emerging pathogens. To assess the impact of this diversity on the accuracy of mold-infection diagnoses, we identified mold clinical isolates in French Guiana during a five-month follow-up using both microscopy and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. In total, 38.8% of the 98 obtained molds isolates could not be identified and required a DNA-based identification. Fungal diversity was high, including 46 species, 26 genera, and 13 orders. Fungal ecology was unusual, as Aspergillus species accounted for only 27% of all isolates, and the Nigri section was the most abundant out of the six detected Aspergillus sections. Macromycetes (orders Agaricales, Polyporales, and Russulales) and endophytic fungi accounted for respectively 11% and 14% of all isolates. Thus, in tropical areas with high fungal diversity, such as French Guiana, routine mold identification tools are inadequate. Molecular identifications, as well as morphological descriptions, are necessary for the construction of region-specific mass spectrum databases. These advances will improve the diagnosis and clinical management of new fungal infections. LAY SUMMARY In French Guiana, environmental fungal diversity may be a source of emerging pathogens. We evaluated microscopy and mass spectrometry to identify mold clinical isolates. With 39% of unidentified isolates, a region-specific mass spectrum database would improve the diagnosis of new fungal infections.
Collapse
Affiliation(s)
- C Nabet
- Sorbonne Université, INSERM, Institut Pierre-Louis d'Epidémiologie et de Santé Publique, AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Parasitologie-Mycologie, Paris, France
| | - S Imbert
- Sorbonne Université, INSERM, CNRS, Centre d'Immunologie et des Maladies Infectieuses, Cimi-Paris, AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Parasitologie-Mycologie, Paris, France
| | - A C Normand
- Sorbonne Université, INSERM, Institut Pierre-Louis d'Epidémiologie et de Santé Publique, AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Parasitologie-Mycologie, Paris, France
| | - D Blanchet
- Department of Parasitology-Mycology, Hôpital Andrée Rosemon, Cayenne, French Guiana
| | - R Chanlin
- Department of Parasitology-Mycology, Hôpital Andrée Rosemon, Cayenne, French Guiana
| | - P Becker
- Sciensano, BCCM/IHEM collection, Mycology and Aerobiology Unit, Brussels, Belgium
| | - M Demar
- Department of Parasitology-Mycology, Hôpital Andrée Rosemon, Cayenne, French Guiana
- EA 3593, Ecosystèmes Amazoniens et Pathologies Tropicales, Université de Guyane, Cayenne, French Guiana
| | - R Piarroux
- Sorbonne Université, INSERM, Institut Pierre-Louis d'Epidémiologie et de Santé Publique, AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Parasitologie-Mycologie, Paris, France
| |
Collapse
|
20
|
Schneider J, Baur X, Becker P. [Assessment of Asbestos-related Occupational Diseases: Socio-medical and Legal Aspects]. Pneumologie 2020; 74:603-610. [PMID: 32643765 DOI: 10.1055/a-1201-3840] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Occupational diseases are certain diseases designated as such by law. Whereas the medical conditions are described in guidelines, their recognition is based on judicial administrative procedures. Establishing causality is based on requirements of social law. The basic socio-legal concepts are mentioned and the principles of causality in asbestos-related occupational diseases are listed. Exemplary social court judgments are cited. Judgements may not infrequently differ from the medical point of view. The aim of this article is to describe the correct use of social medical understanding in order to carry out adequate assessment of occupational diseases, which implements the legal requirements.
Collapse
Affiliation(s)
- J Schneider
- Institut und Poliklinik für Arbeits- und Sozialmedizin (Komm. Leiter: Prof. Dr. Joachim Schneider), Gießen
| | - X Baur
- European Society for Environmental and Occupational Medicine, Berlin, Deutschland, Universität von Hamburg, ZFA Hamburg (em. Professor Dr. Xaver Baur)
| | - P Becker
- Vorsitzender Richter am Bundessozialgericht, Honorarprofessor der Universität Kassel, Bundessozialgericht, Kassel
| |
Collapse
|
21
|
Kaminskii AA, Bohatý L, Eichler HJ, Lux O, Rhee H, Burianek M, Becker P. Stimulated Raman Scattering in Melilite‐Type Crystals Ca
2
MgSi
2
O
7
and Ca
2
Ga
2
SiO
7. Crystal Research and Technology 2020. [DOI: 10.1002/crat.202000038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alexander A. Kaminskii
- Institute of Crystallography Federal Scientific Center “Crystallography and Photonics,” Russian Academy of Sciences Moscow 119333 Russia
| | - Ladislav Bohatý
- Section Crystallography Institute of Geology und Mineralogy University of Cologne Zülpicher Str. 49 b Köln 50674 Germany
| | - Hans Joachim Eichler
- Institute of Optics and Atomic Physics Technical University of Berlin Berlin 10623 Germany
| | - Oliver Lux
- Institute of Optics and Atomic Physics Technical University of Berlin Berlin 10623 Germany
- Institute of Atmospheric Physics German Aerospace Center (DLR) Münchener Str. 20 Oberpfaffenhofen Wessling 82234 Germany
| | - Hanjo Rhee
- Institute of Optics and Atomic Physics Technical University of Berlin Berlin 10623 Germany
| | - Manfred Burianek
- Section Crystallography Institute of Geology und Mineralogy University of Cologne Zülpicher Str. 49 b Köln 50674 Germany
- Faculty Geosciences University Bremen Klagenfurter Straße 2‐4 Bremen 28359 Germany
| | - Petra Becker
- Section Crystallography Institute of Geology und Mineralogy University of Cologne Zülpicher Str. 49 b Köln 50674 Germany
| |
Collapse
|
22
|
Bohatý L, Bayarjargal L, Andersen L, Held P, Becker P. Triclinic Pedial Sarcosinium Hydrogen l(+)-Tartrate-Crystal Growth, Pyroelectricity, Thermal Expansion, and Linear Optical Properties. Crystal Research and Technology 2020. [DOI: 10.1002/crat.201900040] [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] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ladislav Bohatý
- Abt. Kristallographie; Institut für Geologie und Mineralogie; Universität zu Köln; Zülpicher Str. 49 b 50674 Köln Germany
| | - Lkhamsuren Bayarjargal
- Abt. Kristallographie; Institut für Geowissenschaften; Goethe-Universität Frankfurt; Altenhöferallee 1 60438 Frankfurt am Main Germany
| | - Lionel Andersen
- II. Physikalisches Institut; Universität zu Köln; Zülpicher Str. 77 50937 Köln Germany
| | - Peter Held
- Abt. Kristallographie; Institut für Geologie und Mineralogie; Universität zu Köln; Zülpicher Str. 49 b 50674 Köln Germany
| | - Petra Becker
- Abt. Kristallographie; Institut für Geologie und Mineralogie; Universität zu Köln; Zülpicher Str. 49 b 50674 Köln Germany
| |
Collapse
|
23
|
Sharon D, Allen R, Martinez-Martin P, Walters A, Strambi LF, Hogl B, Trotti L, Buchfuhrer M, Swieca J, Bogan R, Zak R, Hensley J, Schaefer L, Marelli S, Zucconi M, Stefani A, Holzknecht E, Olvera V, Meaklim H, Laska I, Becker P. Validation of the self-administered version of the international restless legs syndrome study group severity rating scale - the sIRLS. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.965] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
24
|
Becker P, Bosschaerts M, Chaerle P, Daniel HM, Hellemans A, Olbrechts A, Rigouts L, Wilmotte A, Hendrickx M. Public Microbial Resource Centers: Key Hubs for Findable, Accessible, Interoperable, and Reusable (FAIR) Microorganisms and Genetic Materials. Appl Environ Microbiol 2019; 85:e01444-19. [PMID: 31471301 PMCID: PMC6803313 DOI: 10.1128/aem.01444-19] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
In the context of open science, the availability of research materials is essential for knowledge accumulation and to maximize the impact of scientific research. In microbiology, microbial domain biological resource centers (mBRCs) have long-standing experience in preserving and distributing authenticated microbial strains and genetic materials (e.g., recombinant plasmids and DNA libraries) to support new discoveries and follow-on studies. These culture collections play a central role in the conservation of microbial biodiversity and have expertise in cultivation, characterization, and taxonomy of microorganisms. Information associated with preserved biological resources is recorded in databases and is accessible through online catalogues. Legal expertise developed by mBRCs guarantees end users the traceability and legality of the acquired material, notably with respect to the Nagoya Protocol. However, awareness of the advantages of depositing biological materials in professional repositories remains low, and the necessity of securing strains and genetic resources for future research must be emphasized. This review describes the unique position of mBRCs in microbiology and molecular biology through their history, evolving roles, expertise, services, challenges, and international collaborations. It also calls for an increased deposit of strains and genetic resources, a responsibility shared by scientists, funding agencies, and publishers. Journal policies requesting a deposit during submission of a manuscript represent one of the measures to make more biological materials available to the broader community, hence fully releasing their potential and improving openness and reproducibility in scientific research.
Collapse
Affiliation(s)
- P Becker
- BCCM/IHEM Fungi Collection, Mycology and Aerobiology, Sciensano, Brussels, Belgium
| | - M Bosschaerts
- BCCM Coordination Cell, Belgian Science Policy, Brussels, Belgium
| | - P Chaerle
- BCCM/DCG Diatoms Collection, Ghent University, Ghent, Belgium
| | - H-M Daniel
- BCCM/MUCL, Mycothèque de l'Université Catholique de Louvain, Earth and Life Institute, Mycology Laboratory, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
| | - A Hellemans
- BCCM/LMG Bacteria Collection, Laboratory of Microbiology, Faculty of Science, Ghent University, Ghent, Belgium
| | - A Olbrechts
- BCCM/GeneCorner Plasmid Collection, Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - L Rigouts
- BCCM/ITM Mycobacteria Collection, Institute of Tropical Medicine, Antwerp, Belgium
| | - A Wilmotte
- BCCM/ULC Cyanobacteria Collection, InBios-Centre for Protein Engineering, Université de Liège, Liège, Belgium
| | - M Hendrickx
- BCCM/IHEM Fungi Collection, Mycology and Aerobiology, Sciensano, Brussels, Belgium
| |
Collapse
|
25
|
Bellini S, Green-Corkins K, Van Poots H, Carney L, Medico T, Bartholomew T, Becker P. Evaluating the Efficacy of Pediatric Malnutrition Indicators: A User Survey. J Acad Nutr Diet 2019. [DOI: 10.1016/j.jand.2019.08.043] [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]
|
26
|
Zeidan A, Becker P, Patel P, Schiller G, Tsai M, Lin T, Wang E, Erlander M, Cortes J. Polo-like kinase 1 (PLK1) inhibitor, onvansertib, in combination with low-dose cytarabine or decitabine in patients with relapsed/refractory acute myeloid leukaemia in phase Ib. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz251.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
27
|
Kerkhoff L, Becker P. Crystal growth investigations of lithium iridate, Li 2IrO 3, and lithium ruthenates, Li 2RuO 3 and Li 3RuO 4. Acta Crystallogr A Found Adv 2019. [DOI: 10.1107/s2053273319092222] [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: 11/10/2022] Open
|
28
|
Berndtsson R, Becker P, Persson A, Aspegren H, Haghighatafshar S, Jönsson K, Larsson R, Mobini S, Mottaghi M, Nilsson J, Nordström J, Pilesjö P, Scholz M, Sternudd C, Sörensen J, Tussupova K. Drivers of changing urban flood risk: A framework for action. J Environ Manage 2019; 240:47-56. [PMID: 30928794 DOI: 10.1016/j.jenvman.2019.03.094] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 10/25/2018] [Revised: 03/12/2019] [Accepted: 03/19/2019] [Indexed: 06/09/2023]
Abstract
This study focuses on drivers for changing urban flood risk. We suggest a framework for guiding climate change adaptation action concerning flood risk and manageability in cities. The identified key drivers of changing flood hazard and vulnerability are used to provide an overview of each driver's impact on flood risk and manageability at the city level. We find that identified drivers for urban flood risk can be grouped in three different priority areas with different time horizon. The first group has high impact but is manageable at city level. Typical drivers in this group are related to the physical environment such as decreasing permeability and unresponsive engineering. The second group of drivers is represented by public awareness and individual willingness to participate and urbanization and urban sprawl. These drivers may be important and are manageable for the cities and they involve both short-term and long-term measures. The third group of drivers is related to policy and long-term changes. This group is represented by economic growth and increasing values at risk, climate change, and increasing complexity of society. They have all high impact but low manageability. Managing these drivers needs to be done in a longer time perspective, e.g., by developing long-term policies and exchange of ideas.
Collapse
Affiliation(s)
- R Berndtsson
- Water Resources Engineering, Lund University, SE-221 00, Lund, Sweden; Center for Middle Eastern Studies, Lund University, SE-221 00, Lund, Sweden.
| | - P Becker
- Risk Management and Societal Safety, Lund University, SE-221 00, Lund, Sweden; Unit for Environmental Sciences and Management, North-West University, Potchefstroom, 2520, South Africa
| | - A Persson
- GIS Centre/Physical Geography and Ecosystem Science, Lund University, SE-221 00, Lund, Sweden
| | - H Aspegren
- Water and Environmental Engineering, Lund University, SE-221 00, Lund, Sweden; VA SYD, SE-211 20 Malmö, Sweden
| | - S Haghighatafshar
- Water and Environmental Engineering, Lund University, SE-221 00, Lund, Sweden
| | - K Jönsson
- Water and Environmental Engineering, Lund University, SE-221 00, Lund, Sweden
| | - R Larsson
- Water Resources Engineering, Lund University, SE-221 00, Lund, Sweden
| | - S Mobini
- Water Resources Engineering, Lund University, SE-221 00, Lund, Sweden
| | - M Mottaghi
- Water and Environmental Engineering, Lund University, SE-221 00, Lund, Sweden; VA SYD, SE-211 20 Malmö, Sweden; Architecture and Built Environment, Lund University, SE-221 00, Lund, Sweden
| | - J Nilsson
- Faculty of Culture and Society, Malmö University, SE-205 06, Malmö, Sweden
| | - J Nordström
- AgriFood, Economics Centre, Lund University, SE-220 07, Lund, Sweden
| | - P Pilesjö
- Center for Middle Eastern Studies, Lund University, SE-221 00, Lund, Sweden; GIS Centre/Physical Geography and Ecosystem Science, Lund University, SE-221 00, Lund, Sweden
| | - M Scholz
- Water Resources Engineering, Lund University, SE-221 00, Lund, Sweden; Department of Civil Engineering Science, University of Johannesburg, PO Box 524, Johannesburg, South Africa; Directorate of Civil Engineering, University of Salford, Greater Manchester, M5 4WT, United Kingdom
| | - C Sternudd
- Architecture and Built Environment, Lund University, SE-221 00, Lund, Sweden
| | - J Sörensen
- Water Resources Engineering, Lund University, SE-221 00, Lund, Sweden
| | - K Tussupova
- Water Resources Engineering, Lund University, SE-221 00, Lund, Sweden; Center for Middle Eastern Studies, Lund University, SE-221 00, Lund, Sweden; Center for Transfer of Technology, Karaganda State Medical University, 100004, Karaganda, Kazakhstan
| |
Collapse
|
29
|
Revelli A, Moretti Sala M, Monaco G, Becker P, Bohatý L, Hermanns M, Koethe TC, Fröhlich T, Warzanowski P, Lorenz T, Streltsov SV, van Loosdrecht PHM, Khomskii DI, van den Brink J, Grüninger M. Resonant inelastic x-ray incarnation of Young's double-slit experiment. Sci Adv 2019; 5:eaav4020. [PMID: 30746479 PMCID: PMC6357738 DOI: 10.1126/sciadv.aav4020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 12/14/2018] [Indexed: 06/09/2023]
Abstract
Young's archetypal double-slit experiment forms the basis for modern diffraction techniques: The elastic scattering of waves yields an interference pattern that captures the real-space structure. Here, we report on an inelastic incarnation of Young's experiment and demonstrate that resonant inelastic x-ray scattering (RIXS) measures interference patterns, which reveal the symmetry and character of electronic excited states in the same way as elastic scattering does for the ground state. A prototypical example is provided by the quasi-molecular electronic structure of insulating Ba3CeIr2O9 with structural Ir dimers and strong spin-orbit coupling. The double "slits" in this resonant experiment are the highly localized core levels of the two Ir atoms within a dimer. The clear double-slit-type sinusoidal interference patterns that we observe allow us to characterize the electronic excitations, demonstrating the power of RIXS interferometry to unravel the electronic structure of solids containing, e.g., dimers, trimers, ladders, or other superstructures.
Collapse
Affiliation(s)
- A. Revelli
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - M. Moretti Sala
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - G. Monaco
- Dipartimento di Fisica, Università di Trento, via Sommarive 14, 38123 Povo (TN), Italy
| | - P. Becker
- Abteilung Kristallographie, Institut für Geologie und Mineralogie, Zülpicher Strasse 49b, D-50674 Köln, Germany
| | - L. Bohatý
- Abteilung Kristallographie, Institut für Geologie und Mineralogie, Zülpicher Strasse 49b, D-50674 Köln, Germany
| | - M. Hermanns
- Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- Department of Physics, University of Gothenburg, SE-412 96 Gothenburg, Sweden
- Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden
- Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden
| | - T. C. Koethe
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - T. Fröhlich
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - P. Warzanowski
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - T. Lorenz
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - S. V. Streltsov
- M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620137 Ekaterinburg, Russia
- Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia
| | - P. H. M. van Loosdrecht
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - D. I. Khomskii
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - J. van den Brink
- Institute for Theoretical Solid State Physics, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - M. Grüninger
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| |
Collapse
|
30
|
Due B, Becker P, Crawford T. DMD CLINICAL THERAPIES I. Neuromuscul Disord 2018. [DOI: 10.1016/j.nmd.2018.06.146] [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: 11/16/2022]
|
31
|
Fröhlich T, Stein J, Bohatý L, Becker P, Gukasov A, Braden M. Structural and magnetic phase transitions in Cs 2[FeCl 5(H 2O)]. J Phys Condens Matter 2018; 30:295403. [PMID: 29869988 DOI: 10.1088/1361-648x/aaca6c] [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] [Indexed: 06/08/2023]
Abstract
The compound [Formula: see text] is magnetoelectric but not multiferroic with an erythrosiderite-related structure. We present a comprehensive investigation of its structural and antiferromagnetic phase transitions by polarization microscopy, pyroelectric measurements, x-ray diffraction and neutron diffraction. At about [Formula: see text] K, the compound changes its symmetry from Cmcm to I2/c, with a doubling of the original c-axis. This transformation is associated with rotations of the [Formula: see text] octahedra and corresponds to an ordering of the [Formula: see text] molecules and of the related [Formula: see text] bonds. A significant ferroelectric polarization can be excluded for this transition by precise pyrocurrent measurements. The antiferromagnetic phase transition occurring at [Formula: see text] results in the magnetic space group [Formula: see text], which perfectly agrees with previous measurements of the linear magnetoelectric effect and magnetization.
Collapse
Affiliation(s)
- Tobias Fröhlich
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
| | | | | | | | | | | |
Collapse
|
32
|
Versteeg RB, Zhu J, Padmanabhan P, Boguschewski C, German R, Goedecke M, Becker P, van Loosdrecht PHM. A tunable time-resolved spontaneous Raman spectroscopy setup for probing ultrafast collective excitation and quasiparticle dynamics in quantum materials. Struct Dyn 2018; 5:044301. [PMID: 30057929 PMCID: PMC6051769 DOI: 10.1063/1.5037784] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 06/29/2018] [Indexed: 05/12/2023]
Abstract
We present a flexible and efficient ultrafast time-resolved spontaneous Raman spectroscopy setup to study collective excitation and quasi-particle dynamics in quantum materials. The setup has a broad energy tuning range extending from the visible to near infrared spectral regions for both the pump excitation and Raman probe pulses. Additionally, the balance between energy and time-resolution can be controlled. A high light collecting efficiency is realized by high numerical aperture collection optics and a high-throughput flexible spectrometer. We demonstrate the functionality of the setup with a study of the zone-center longitudinal optical phonon and hole continuum dynamics in silicon and discuss the role of the Raman tensor in time-resolved Raman scattering. In addition, we show an evidence for unequal phonon softening rates at different high symmetry points in the Brillouin zone of silicon by means of detecting pump-induced changes in the two-phonon overtone spectrum. Demagnetization dynamics in the helimagnet Cu2OSeO3 is studied by observing softening and broadening of a magnon after photo-excitation, underlining the unique power of measuring transient dynamics in the frequency domain, and the feasibility to study phase transitions in quantum materials.
Collapse
Affiliation(s)
- R. B. Versteeg
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - J. Zhu
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - P. Padmanabhan
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - C. Boguschewski
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - R. German
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - M. Goedecke
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - P. Becker
- Abteilung Kristallographie, Institut für Geologie und Mineralogie, Universität zu Köln, Zülpicher Straße 49b, D-50674 Köln, Germany
| | - P. H. M. van Loosdrecht
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| |
Collapse
|
33
|
Hess PW, Becker P, Kaplan HB, Kyprianidis A, Lee AC, Neyenhuis B, Pagano G, Richerme P, Senko C, Smith J, Tan WL, Zhang J, Monroe C. Non-thermalization in trapped atomic ion spin chains. Philos Trans A Math Phys Eng Sci 2017; 375:rsta.2017.0107. [PMID: 29084886 PMCID: PMC5665787 DOI: 10.1098/rsta.2017.0107] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/27/2017] [Indexed: 05/27/2023]
Abstract
Linear arrays of trapped and laser-cooled atomic ions are a versatile platform for studying strongly interacting many-body quantum systems. Effective spins are encoded in long-lived electronic levels of each ion and made to interact through laser-mediated optical dipole forces. The advantages of experiments with cold trapped ions, including high spatio-temporal resolution, decoupling from the external environment and control over the system Hamiltonian, are used to measure quantum effects not always accessible in natural condensed matter samples. In this review, we highlight recent work using trapped ions to explore a variety of non-ergodic phenomena in long-range interacting spin models, effects that are heralded by the memory of out-of-equilibrium initial conditions. We observe long-lived memory in static magnetizations for quenched many-body localization and prethermalization, while memory is preserved in the periodic oscillations of a driven discrete time crystal state.This article is part of the themed issue 'Breakdown of ergodicity in quantum systems: from solids to synthetic matter'.
Collapse
Affiliation(s)
- P W Hess
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - P Becker
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - H B Kaplan
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - A Kyprianidis
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - A C Lee
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - B Neyenhuis
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - G Pagano
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - P Richerme
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - C Senko
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - J Smith
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - W L Tan
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - J Zhang
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| | - C Monroe
- Joint Quantum Institute, Department of Physics, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA
| |
Collapse
|
34
|
Warncke K, Lickert R, Eitel S, Gloning KP, Bonifacio E, Sedlmeier EM, Becker P, Knoop J, Beyerlein A, Ziegler AG. Thymus Growth and Fetal Immune Responses in Diabetic Pregnancies. Horm Metab Res 2017; 49:892-898. [PMID: 29136677 DOI: 10.1055/s-0043-120671] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Type 1 diabetes (T1D) during pregnancy possibly affects the development of the thymus and the maturation of the immune system in the offspring. The aim of the ImmunDiabRisk study was to investigate thymus growth and maternal and fetal immune responses in pregnancies with and without T1D. The thymus circumferences of the fetuses of pregnant women with T1D (n=49) and without diabetes (n=59) were measured using ultrasound around the 29th gestational week and standardized for gestational age. Simultaneously, the frequencies and total numbers of cell markers were analyzed by flow cytometry in maternal peripheral blood, and at birth in umbilical cord blood. The standardized circumference of the thymus was similar in fetuses of mothers with and without T1D (p=0.26). We observed higher numbers of FOXP3 Tregs, memory Tregs, erythrocytes, and lymphocytes in the cord blood from T1D pregnancies (p=0.01, p=0.002, p=0.002 and p=0.02, respectively). The frequencies of CD4+/CD8+ T cells correlated positively in maternal blood and umbilical cord blood of mother-child pairs, as did the levels of neutrophils (Spearman's correlation coefficient r=0.43, p=0.02 for CD4+/CD8+ cells; r=0.46, p=0.03 for neutrophils), while no significant correlations were observed between thymus circumference and any cell markers in the child. Parts of the prenatal immune system seem to develop differently in the offspring of mothers with and without T1D. The correlation of Tregs between maternal blood and cord blood may indicate a significant cross-talk between the maternal and fetal immune system.
Collapse
Affiliation(s)
- Katharina Warncke
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
- Forschergruppe Diabetes e.V., Neuherberg, Germany
- Department of Pediatrics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Ramona Lickert
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
| | - Stephanie Eitel
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
| | | | - Ezio Bonifacio
- Center for Regenerative Therapies - Dresden, Technische Universität, Dresden, Germany
- Institute for Diabetes and Obesity, Helmholtz Zentrum München, Neuherberg, Germany
| | - Eva-Maria Sedlmeier
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
| | - Petra Becker
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
| | - Jan Knoop
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
| | - Andreas Beyerlein
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
| | - Anette-Gabriele Ziegler
- Institute of Diabetes Research, Helmholtz Zentrum München, and Forschergruppe Diabetes, Klinikum rechts der Isar, Technische Universität München, Neuherberg, Germany
- Forschergruppe Diabetes e.V., Neuherberg, Germany
| |
Collapse
|
35
|
Loiko P, Becker P, Bohatý L, Liebald C, Peltz M, Vernay S, Rytz D, Serres JM, Mateos X, Wang Y, Xu X, Xu J, Major A, Baranov A, Griebner U, Petrov V. Sellmeier equations, group velocity dispersion, and thermo-optic dispersion formulas for CaLnAlO 4 (Ln = Y, Gd) laser host crystals. Opt Lett 2017; 42:2275-2278. [PMID: 28614330 DOI: 10.1364/ol.42.002275] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 05/15/2017] [Indexed: 06/07/2023]
Abstract
We studied the refractive index and dispersive properties of the tetragonal rare-earth calcium aluminates, CaLnAlO4 (Ln=Gd or Y). Sellmeier equations were derived for the spectral range of 0.35-2.1 μm. The group velocity dispersion (GVD) in CaGdAlO4 is positive at ∼1 μm, 95 fs2/mm and negative at ∼2 μm, -40 fs2/mm. The GVD values for CaYAlO4 are similar. In addition, thermo-optic coefficients, dn/dT, and thermal coefficients of the optical path were determined for CaYAlO4. dn/dT is negative at ∼1 μm, dno/dT=-7.8, and dne/dT=-8.7×10-6 K-1. Thermo-optic dispersion formulas were constructed. The obtained data are of key importance to the design of high-power mode-locked oscillators at ∼1 and ∼2 μm based on such laser hosts.
Collapse
|
36
|
Bohatý L, Ochrombel R, Liebertz J, Becker P. Linear electrooptic effect of the monoclinic polar bismuth triborate, BiB3O6. Crystal Research and Technology 2016. [DOI: 10.1002/crat.201600250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ladislav Bohatý
- Abteilung Kristallographie; Institut für Geologie und Mineralogie der Universität zu Köln; Greinstr. 6 D-50939 Köln
| | - René Ochrombel
- Abteilung Kristallographie; Institut für Geologie und Mineralogie der Universität zu Köln; Greinstr. 6 D-50939 Köln
| | - Josef Liebertz
- Abteilung Kristallographie; Institut für Geologie und Mineralogie der Universität zu Köln; Greinstr. 6 D-50939 Köln
| | - Petra Becker
- Abteilung Kristallographie; Institut für Geologie und Mineralogie der Universität zu Köln; Greinstr. 6 D-50939 Köln
| |
Collapse
|
37
|
Becker P, Schwebig A, Brauninger S, Bialleck H, Luxembourg B, Schulz M, Tsamadou C, Wiesneth M, Reinhardt P, Mytilineos J, Seidl C, Gattu S, Kaliakina N, Singh P, Schrezenmeier H, Seifried E, Bonig H. Healthy donor hematopoietic stem cell mobilization with biosimilar granulocyte-colony-stimulating factor: safety, efficacy, and graft performance. Transfusion 2016; 56:3055-3064. [PMID: 27633122 DOI: 10.1111/trf.13853] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 08/11/2016] [Accepted: 08/15/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Biosimilar granulocyte-colony-stimulating factors (G-CSFs) have been available in the European Union since 2008, and Sandoz' biosimilar filgrastim was approved in the United States in March 2015 for all of the reference product's indications except acute radiation syndrome. Biosimilar G-CSFs have been largely embraced by the medical community, except for some reservations about healthy-donor stem cell mobilization, for which use outside of clinical studies was cautioned against by some members of the scientific community. STUDY DESIGN AND METHODS In a two-center safety surveillance study (National Clinical Trial NCT01766934), 245 healthy volunteer stem cell donors were enrolled. Of 244 donors who began mobilization with twice-daily Sandoz biosimilar filgrastim, 242 received a full (n = 241) or partial (n = 1) course of G-CSF and underwent apheresis. Efficacy and safety were assessed and are reported here. RESULTS Biosimilar filgrastim was accompanied by the typical G-CSF class-related adverse effects of expected frequency and severity. Median mobilization for CD34-positive stem cells was 97/µL (range, 20-347/µL); after one apheresis (91%) or two aphereses (9%) from all but three donors (1.2%), cell doses in excess of the typical 4 × 106 CD34-positive cells/kg of the recipient had been collected (range, 3-52 × 106 /kg). Biochemical and hematologic alterations were consistent with previous reports; all had normalized by the first follow-up 1 month after mobilization. Stem cell products engrafted with typical probability and kinetics for G-CSF-mobilized stem cell products. CONCLUSION These data support the use of biosimilar filgrastim for healthy-donor stem cell mobilization as safe and effective.
Collapse
Affiliation(s)
- Petra Becker
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany
| | | | - Susanne Brauninger
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany
| | - Heike Bialleck
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany
| | - Beate Luxembourg
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany
| | - Miriam Schulz
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany
| | - Chrysanthi Tsamadou
- Institute for Clinical Transfusion Medicine and Immunogenetics, German Red Cross Blood Donor Service and University Hospital Ulm, Ulm, Germany
| | - Markus Wiesneth
- Institute for Clinical Transfusion Medicine and Immunogenetics, German Red Cross Blood Donor Service and University Hospital Ulm, Ulm, Germany
| | - Peter Reinhardt
- Institute for Clinical Transfusion Medicine and Immunogenetics, German Red Cross Blood Donor Service and University Hospital Ulm, Ulm, Germany
| | - Joannis Mytilineos
- Institute for Clinical Transfusion Medicine and Immunogenetics, German Red Cross Blood Donor Service and University Hospital Ulm, Ulm, Germany
| | - Christian Seidl
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany
| | | | | | | | - Hubert Schrezenmeier
- Institute for Clinical Transfusion Medicine and Immunogenetics, German Red Cross Blood Donor Service and University Hospital Ulm, Ulm, Germany
| | - Erhard Seifried
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany
| | - Halvard Bonig
- Institute for Transfusion Medicine and Immunohematology of Goethe University and German Red Cross Blood Donor Service, Frankfurt am Main, Germany.,Department of Medicine/Hematology, University of Washington, Seattle, Washington
| |
Collapse
|
38
|
Warncke K, Puff R, Eitel S, Beyerlein A, Gloning KP, Bonifacio E, Becker P, Ziegler AG. Einfluss von Diabetes während der Schwangerschaft auf das Immunsystem und die Entwicklung des fetalen Thymus. DIABETOL STOFFWECHS 2016. [DOI: 10.1055/s-0036-1584108] [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: 10/21/2022]
|
39
|
Heinrich M, Haupt F, Winkler C, Jergens S, Endesfelder D, Becker P, Antl N, Warncke K, Achenbach P, Ziegler AG. Heterogeneity of young patients with new-onset diabetes mellitus. DIABETOL STOFFWECHS 2016. [DOI: 10.1055/s-0036-1584097] [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: 10/21/2022]
|
40
|
Becker P, Furie R, Mitrane M, Zhao E. THU0307 Repository Corticotropin Injection (RCI) Attenuates Disease Activity in Patients with Persistently Active Systemic Lupus Erythematosus (SLE) Requiring Corticosteroids: Results from A 44-Week Open-Label Extension Study:. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2198] [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: 11/03/2022]
|
41
|
Normand A, Djenad F, Becker P, Gabriel F, Gary-Toussaint M, Cassagne C, Gautier M, Ranque S, Accoceberry I, Marty P, Hendrickx M, Piarroux R. Identification en ligne des moisissures et des dermatophytes. J Mycol Med 2016. [DOI: 10.1016/j.mycmed.2016.04.081] [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: 11/28/2022]
|
42
|
Higgins P, Decker D, Becker P. AB0105 Inhibition of A Streptococcal Cell Wall Model of Arthritis Flare by Repository Corticotropin Injection. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2018] [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: 11/03/2022]
|
43
|
Becker P, Libowitzky E, Kleinschrodt R, Bohatý L. Linear optical properties and Raman spectroscopy of natural fluorapatite. Crystal Research and Technology 2016. [DOI: 10.1002/crat.201500341] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Petra Becker
- Institute of Geology and Mineralogy, Section Crystallography; University of Cologne; Greinstr. 6 50939 Köln Germany
| | - Eugen Libowitzky
- Institute of Mineralogy and Crystallography; University of Vienna; Althanstr. 14 1090 Wien Austria
| | - Reiner Kleinschrodt
- Institute of Geology and Mineralogy; Section Petrology; Greinstr. 4-6 50939 Köln Germany
| | - Ladislav Bohatý
- Institute of Geology and Mineralogy, Section Crystallography; University of Cologne; Greinstr. 6 50939 Köln Germany
| |
Collapse
|
44
|
Stevens P, Muller E, Becker P. Gastroschisis in a developing country: poor resuscitation is a more significant predictor of mortality than postnasal transfer time. S AFR J SURG 2016; 54:4-9. [PMID: 28240489] [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: 06/06/2023]
Abstract
BACKGROUND The time from birth to the first paediatric surgical consultation of neonates with gastroschisis is a predictor of mortality in dveloping countries. This is contrary to findings in the developed world. We set out to document this relationship within our population. METHOD Neonates with gastroschisis who were transferred to Steve Biko Academic Hospital within the study period were included. The association between mortality and demographic, clinical and biochemical variables was assessed. Significant variables after univariate analysis were subjected to multivariates regression. RESULTS Sixty patients were included. The mortality rate was 65%. Mean transfer time and distance were 14.9 hours and 225km. Forty-eight per cent of the neonates were either dehydrated or in hypovolaemic shock clinically on arrival. Eight neonates arrived hypothermic. It was shown through univariate analysis that female sex, appropriate weight for gestational age, hydration status, gestation, transfer time, serum urea, base deficit and serum bicarbonate (HCO3) were significant predictors of mortality. Only female sex, appropriate weight for gestational age and serum HC03 were shown to be significant using ultivariate analysis. CONCLUSION Our high mortality rate was not due to lengthy transfer times. The poor clinical condition of the patients on arrival at our hospital, which relates to deficiencies in the neonatal transfer system, had a direct impact on the survival of neonates with gastroschisis.
Collapse
Affiliation(s)
- P Stevens
- Department of Paediatric Surgery, Steve Biko Academic Hospital, University of Pretoria
| | - E Muller
- Department of Paediatric Surgery, Steve Biko Academic Hospital, University of Pretoria
| | - P Becker
- South African Medical Research Council
| |
Collapse
|
45
|
Bohatý L, Held P, Becker P. Crystal growth, crystal structure and optical properties of calcium antimony tartrate nonahydrate, Ca[Sb2((+)C4H2O6)2]·9H2O. Crystal Research and Technology 2015. [DOI: 10.1002/crat.201500269] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ladislav Bohatý
- Abteilung Kristallographie; Institut für Geologie und Mineralogie; Universität zu Köln; Greinstr. 6 50939 Köln Germany
| | - Peter Held
- Abteilung Kristallographie; Institut für Geologie und Mineralogie; Universität zu Köln; Greinstr. 6 50939 Köln Germany
| | - Petra Becker
- Abteilung Kristallographie; Institut für Geologie und Mineralogie; Universität zu Köln; Greinstr. 6 50939 Köln Germany
| |
Collapse
|
46
|
Bohatý L, Becker P, Haussühl E, Němec I, Lux O, Joachim Eichler H, Yoneda H, Shirakawa A, Kaminskii AA. Single crystals of guanidinium zinc sulfate, [C(NH 2) 3] 2Zn(SO 4) 2 – growth, structure, vibrational spectroscopy and stimulated Raman scattering. Z KRIST-CRYST MATER 2015. [DOI: 10.1515/zkri-2015-1839] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Large single crystals of the tetragonal (space group I4̅2d) guanidinium zinc sulfate, [C(NH2)3]2Zn(SO4)2, were grown and the crystal structure was redetermined. Vibrational spectra obtained by Raman and IR investigations are presented, together with an assignment of the observed vibration modes. Precise refractive index data in the wavelength range from 0.365 to 1.083 μm are given. [C(NH2)3]2Zn(SO4)2 is introduced as a new stimulated Raman scattering (SRS)-active crystal with three SRS-active vibration modes with ω
SRS1 ≈ 985 cm–1, ω
SRS2 ≈ 3390 cm–1 and ω
SRS3 ≈ 1015 cm–1. They allow for the generation of broadband nonlinear emission via χ
(3)- (SRS and Raman-induced four wave mixing, RFWM) as well as cascaded χ
(2)↔χ
(3)- processes.
Collapse
Affiliation(s)
- Ladislav Bohatý
- Institut für Kristallographie, Universität zu Köln, Greinstr. 6, 50939 Köln, Germany
| | - Petra Becker
- Institut für Kristallographie, Universität zu Köln, Greinstr. 6, 50939 Köln, Germany
| | - Eiken Haussühl
- Institut für Geowissenschaften, Goethe-Universität, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - Ivan Němec
- Department of Inorganic Chemistry, Charles University in Prague, Hlavova 2030/8, 128 43 Prague 2, Czech Republic
| | - Oliver Lux
- Institute of Optics and Atomic Physics, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Hans Joachim Eichler
- Institute of Optics and Atomic Physics, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Hitoki Yoneda
- Institute of Laser Science, University of Electro-Communications, 182-8585 Tokyo, Japan
| | - Akira Shirakawa
- Institute of Laser Science, University of Electro-Communications, 182-8585 Tokyo, Japan
| | - Alexander A. Kaminskii
- Institute of Crystallography, Russian Academy of Sciences, Moscow, Leninskii Prospect 59, 119333 Moscow, Russia
| |
Collapse
|
47
|
Ackermann M, Andersen L, Becker P, Bohatý L. Pyroelectric properties of the monoclinic rare earth nitrates A
2
Ln(NO 3) 5·4H 2O ( A = NH 4, Rb; Ln = La, Ce). Z KRIST-CRYST MATER 2015. [DOI: 10.1515/zkri-2014-1827] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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
Abstract
The pyroelectric effect of four isomorphic monoclinic (space group Cc), non-ferroelectric rare earth nitrates A
2
Ln(NO3)5·4H2O (A = NH4, Rb; Ln = La, Ce) was investigated in the temperature range between 100 K and 300 K, using a home-made continuous-flow cryostat for measurements of pyroelectric currents. The symmetry-allowed temperature-dependent change of orientation of the pyroelectric vector
p
within the mirror plane is unusually large, showing a rotation of
p
of 148°, 129°, 36° and 40° for (NH4)2La(NO3)5·4H2O, (NH4)2Ce(NO3)5·4H2O, Rb2La(NO3)5·4H2O and Rb2Ce(NO3)5·4H2O, respectively, while changing the temperature from 100 K to 300 K in each case. The pyroelectric coefficients are up to ten times larger than p
3
of tourmaline. In addition, new data of the pyroelectric coefficients of Li2SO4·H2O and BiB3O6 and their temperature dependence are given.
Collapse
Affiliation(s)
- Matthias Ackermann
- Institut für Kristallographie, Universität zu Köln, Greinstr. 6, 50939 Köln, Germany
| | - Lionel Andersen
- Institut für Kristallographie, Universität zu Köln, Greinstr. 6, 50939 Köln, Germany
| | - Petra Becker
- Institut für Kristallographie, Universität zu Köln, Greinstr. 6, 50939 Köln, Germany
| | - Ladislav Bohatý
- Institut für Kristallographie, Universität zu Köln, Greinstr. 6, 50939 Köln, Germany
| |
Collapse
|
48
|
Leo N, Meier D, Becker P, Bohatý L, Fiebig M. Magnetically driven second-harmonic generation with phase matching in MnWO₄. Opt Express 2015; 23:27700-27706. [PMID: 26480432 DOI: 10.1364/oe.23.027700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Phase matching is known to enhance the nonlinear optical response in materials with a non-centrosymmetric crystallographic or electronic structure. In contrast, phase-matched frequency doubling driven by non-centrosymmetric magnetism that induces acentricity in otherwise centrosymmetric structures has not been reported yet. In our study we demonstrate the emergence of magnetically driven second-harmonic generation (SHG) with phase matching in MnWO4. The phase-matched wavelength for SHG can be tuned continuously between 450 nm to 630 nm with the conversion efficiency being determined by the refractive indices and their dispersion. Our findings reveal a new strategy towards magnetism-based conversion-materials and a route for controlling the nonlinear signal yield by acting primarily on the material's spin degree of freedom rather than employing its electronic or structural properties.
Collapse
|
49
|
Van Aardt MC, Dreyer G, Richter KL, Becker P. Human papillomavirus-type distribution in South African women without cytological abnormalities: a peri-urban study. Southern African Journal of Gynaecological Oncology 2015. [DOI: 10.1080/20742835.2013.11441218] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
|
50
|
Hahnemann ML, Wittschieber D, Becker P. ["Needles and pins". Self injury behavior by ingestion of numerous unusual sharp foreign bodies]. ROFO-FORTSCHR RONTG 2015; 188:91-2. [PMID: 26114252 DOI: 10.1055/s-0035-1553271] [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: 10/23/2022]
|