155 results on '"Schär S"'
Search Results
52. Année politique suisse 2010
- Author
-
Institut für Politikwissenschaft an der Universität Bern, Institut für Politikwissenschaft an der Universität Bern, ( ), Bühlmann, M, Freymond, N, Gerber, M, Giger, N, Märk, L, Mosimann, A, Schär, S, Schnyder, S, Institut für Politikwissenschaft an der Universität Bern, Institut für Politikwissenschaft an der Universität Bern, ( ), Bühlmann, M, Freymond, N, Gerber, M, Giger, N, Märk, L, Mosimann, A, Schär, S, and Schnyder, S
- Published
- 2011
53. Investigating Means to Reduce Cognitive Load from Animations
- Author
-
Guttormsen Schär, S., primary and Zimmermann, P. G., additional
- Published
- 2007
- Full Text
- View/download PDF
54. Evaluating a framework of theoretical hypotheses for animation learning
- Author
-
Guttormsen Schär, S., primary and Zuberbühler, H. -J., additional
- Published
- 2005
- Full Text
- View/download PDF
55. INVESTIGATING MEANS TO REDUCE COGNITIVE LOAD FROM ANIMATIONS.
- Author
-
Schär, S. Guttormsen and Zimmermann, P. G.
- Subjects
COMPUTER-generated imagery ,FLOW control (Data transmission systems) ,INTERACTIVE multimedia ,EXPERT systems ,MULTIMEDIA systems - Abstract
This paper reports the theoretical rationale and results of an experiment designed to investigate the relationship between the didactical setting and learning effects with animations. We compared three different multimedia settings. Particularly we investigated whether individual animation flow-control adequately provided didactical means to reduce the cognitive load imposed by animations. We did not find an effect of individual flow control, probably due to the fact that the students did not actively use this feature to take more control over the presentation. Further, by applying differentiated knowledge measures, we investigated if the characteristics of the acquired knowledge were related to the characteristics of the multimedia presentation. We found that media does not influence knowledge acquisition homogeneously. The multimedia effects found in this study are in line with known principles of didactical multimedia design. This study sheds light on some theoretical aspects involved in the complex interaction between learning content, presentation, learning and resulting knowledge. [ABSTRACT FROM AUTHOR]
- Published
- 2006
56. INVESTIGATING MEANS TO REDUCE COGNITIVE LOAD FROM ANIMATIONS.
- Author
-
Guttormsen Schär, S. and Zimmermann, P. G.
- Subjects
COMPUTER-generated imagery ,COGNITION ,LEARNING ,COGNITIVE ability ,INTERACTIVE multimedia ,EDUCATION - Abstract
This paper reports the theoretical rationale and results of an experiment designed to investigate the relationship between the didactical setting and learning effects with animations. We compared three different multimedia settings. Particularly we investigated whether individual animation flow-control adequately provided didactical means to reduce the cognitive load imposed by animations. We did not find an effect of individual flow control, probably due to the fact that the students did not actively use this feature to take more control over the presentation. Further, by applying differentiated knowledge measures, we investigated if the characteristics of the acquired knowledge were related to the characteristics of the multimedia presentation. We found that media does not influence knowledge acquisition homogeneously. The multimedia effects found in this study are in line with known principles of didactical multimedia design. This study sheds light on some theoretical aspects involved in the complex interaction between learning content, presentation, learning and resulting knowledge. [ABSTRACT FROM AUTHOR]
- Published
- 2006
57. Frenkel defect interactions at surfaces of irradiated alkali halides studied by non-contact atomic-force microscopy
- Author
-
Kolodziej, J.J., primary, Such, B., additional, Czuba, P., additional, Krok, F., additional, Piatkowski, P., additional, Struski, P., additional, Szymonski, M., additional, Bennewitz, R., additional, Schär, S., additional, and Meyer, E., additional
- Published
- 2001
- Full Text
- View/download PDF
58. Atomic-resolution images of radiation damage in KBr
- Author
-
Bennewitz, R., primary, Schär, S., additional, Barwich, V., additional, Pfeiffer, O., additional, Meyer, E., additional, Krok, F., additional, Such, B., additional, Kolodzej, J., additional, and Szymonski, M., additional
- Published
- 2001
- Full Text
- View/download PDF
59. Dynamic force microscopy of copper surfaces: Atomic resolution and distance dependence of tip-sample interaction and tunneling current
- Author
-
Loppacher, Ch., primary, Bammerlin, M., additional, Guggisberg, M., additional, Schär, S., additional, Bennewitz, R., additional, Baratoff, A., additional, Meyer, E., additional, and Güntherodt, H.-J., additional
- Published
- 2000
- Full Text
- View/download PDF
60. Experimental aspects of dissipation force microscopy
- Author
-
Loppacher, C., primary, Bennewitz, R., additional, Pfeiffer, O., additional, Guggisberg, M., additional, Bammerlin, M., additional, Schär, S., additional, Barwich, V., additional, Baratoff, A., additional, and Meyer, E., additional
- Published
- 2000
- Full Text
- View/download PDF
61. Atomically resolved edges and kinks of NaCl islands on Cu(111): Experiment and theory
- Author
-
Bennewitz, R., primary, Foster, A. S., additional, Kantorovich, L. N., additional, Bammerlin, M., additional, Loppacher, Ch., additional, Schär, S., additional, Guggisberg, M., additional, Meyer, E., additional, and Shluger, A. L., additional
- Published
- 2000
- Full Text
- View/download PDF
62. Investigating Means to Reduce Cognitive Load from Animations: Applying Differentiated Measures of Knowledge Representation.
- Author
-
Schär, S. Guttormsen and Zimmermann, P. G.
- Subjects
- *
ANIMATION (Cinematography) , *EDUCATIONAL technology , *COGNITION , *MULTIMEDIA systems , *LEARNING , *THEORY of knowledge - Abstract
This paper covers an experiment designed to investigate the relationship between the didactical setting and learning effects with animations. We investigated whether the cognitive load imposed by animations could be reduced when the students could control the flow of the animation. We did not find an effect due to the fact that the students did not actively use this feature to take more control of the presentation. Further, by applying differentiated knowledge measures, we investigated if the characteristics of the acquired knowledge were related to the characteristics of the multimedia presentation. We found that media do not influence knowledge acquisition homogeneously. The multimedia effects found in this study are in line with known principles of didactical multimedia design. This study sheds light on some theoretical aspects involved in the complex interaction between learning content, presentation, learning, and resulting knowledge. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
63. Auszug aus der Jahresrechnung 1975
- Author
-
Schär, S.
- Published
- 1976
- Full Text
- View/download PDF
64. Auszug aus der Jahresrechnung 1977
- Author
-
Schär, S.
- Published
- 1978
- Full Text
- View/download PDF
65. Auszug aus der Jahresrechnung 1978
- Author
-
Schär, S.
- Published
- 1979
- Full Text
- View/download PDF
66. Coaxial plasma gun in the high density regime and injection into a helical field
- Author
-
Schär, S.
- Subjects
LRP 491
67. Evaluating a framework of theoretical hypotheses for animation learning
- Author
-
Guttormsen Schär, S., Zuberbühler, H., Guttormsen Schär, S., and Zuberbühler, H.
- Abstract
This paper presents a set of theoretical hypotheses suggesting various relationships between didactical setting and learning effects with animations. Particularly, we investigated whether individual flow-control adequately provides didactical means to reduce the cognitive load imposed by animations. We did not find an effect of individual flow control, probably due to the fact that this learning condition was embedded in a setting where not enough verbal information was offered together with the graphical animation. Overall the multimedia effects found in this study are in line with known principles of didactical multimedia design. Further, this study sheds light on theoretical aspects involved in the complex interaction between learning content, presentation, learning and resulting knowledge
68. Atomic structure of alkali halide surfaces
- Author
-
Bennewitz, R., Schär, S., Gnecco, E., Pfeiffer, O., Bammerlin, M., Meyer, E., Bennewitz, R., Schär, S., Gnecco, E., Pfeiffer, O., Bammerlin, M., and Meyer, E.
- Abstract
The atomic structure of surfaces of alkali halide crystals has been revealed by means of high-resolution dynamic force microscopy. True atomic resolution is demonstrated both on steps surrounding islands or pits, and on a chemically mixed crystal. We have directly observed the enhanced interaction at low-coordinated sites by force microscopy. The growth of NaCl films on metal surfaces and radiation damage in a KBr surface is discussed based on force microscopy results. The damping of the tip oscillation in dynamic force microscopy might provide insight into dissipation processes on the atomic scale. Finally, we present atomically resolved images of wear debris found after scratching a KBr surface
69. Studies on the mechanism of the copper-catalyzed thermal oxidation of low-density polyethylene
- Author
-
Sack, S, primary, Schär, S, additional, Steger, E, additional, and Wagner, H, additional
- Published
- 1984
- Full Text
- View/download PDF
70. Two-year course of non-suicidal self-injury in an adolescent clinical cohort: The role of childhood adversity in interaction with cortisol secretion.
- Author
-
Reichl C, Schär S, Lerch S, Hedinger N, Brunner R, Koenig J, and Kaess M
- Subjects
- Humans, Adolescent, Male, Female, Longitudinal Studies, Saliva chemistry, Saliva metabolism, Circadian Rhythm physiology, Cohort Studies, Child, Hydrocortisone metabolism, Hydrocortisone analysis, Adverse Childhood Experiences, Hypothalamo-Hypophyseal System metabolism, Hypothalamo-Hypophyseal System physiopathology, Pituitary-Adrenal System metabolism, Pituitary-Adrenal System physiopathology, Self-Injurious Behavior metabolism, Self-Injurious Behavior physiopathology, Self-Injurious Behavior psychology, Hair chemistry, Hair metabolism
- Abstract
Aim: Non-suicidal self-injury (NSSI) is a highly prevalent phenomenon during adolescence. Nonetheless, research on predictors of the clinical course of NSSI over time is still scarce. The present study aimed at investigating the impact of adverse childhood experiences (ACE) and hypothalamus-pituitary-adrenal (HPA) axis functioning on the longitudinal course of NSSI., Methods: In a sample of n = 51 help-seeking adolescents engaging in NSSI, diurnal cortisol secretion (CAR, cortisol awakening response; DSL, diurnal slope), hair cortisol concentrations and ACE were assessed at baseline. Clinical outcome was defined by change in the frequency of NSSI in the past 6 months measured 12 and 24 months after the baseline assessments. Mixed-effects linear regression models were used to test for effects of ACE and HPA axis functioning on the course of NSSI., Results: ACE and HPA axis functioning did not show main but interaction effects in the prediction of NSSI frequency over time: Adolescents with a low severity of ACE and either an increased CAR or a flattened DSL showed a steep decline of NSSI frequency in the first year followed by a subsequent increase of NSSI frequency in the second year., Conclusions: Our findings could be interpreted in the sense of high diurnal cortisol concentrations in the absence of ACE being favorable for clinical improvement on the short-term but bearing a risk of allostatic load and subsequent increase of NSSI frequency. In contrast, adolescents with severe ACE may benefit from elevated cortisol concentrations leading to slower but lasting decreases of NSSI frequency., Competing Interests: Declaration of Competing Interest None., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
71. Comparing the new concept of impairment in personality functioning with borderline personality disorder: differential psychosocial and psychopathological correlates in a clinical adolescent sample.
- Author
-
Wyssen A, Lerch S, Reichl C, Mürner-Lavanchy I, Sigrist C, Schär S, Cavelti M, Koenig J, and Kaess M
- Abstract
Borderline personality disorder (BPD) is an established diagnosis in adolescence with high comorbidity and psychosocial impairment. With the introduction of the alternative model for personality disorders in DSM-5 (AMPD), personality functioning is operationalized using the Level of Personality Functioning Scale (LPFS), which has been shown to be associated with severity of personality pathology. The present study aimed at examining differential psychopathological and psychosocial correlates of LPFS and BPD. A total of 526 adolescent in- and outpatients were interviewed with the STiP-5.1 (LPFS) and the SCID-II. Mixed linear regression was used to investigate the associations between the two interviews with measures of psychopathology and psychosocial impairment. 11.4% met the diagnostic threshold of both interviews, 16.1% only of the LPFS, and 64.1% were below the diagnostic threshold in both interviews (no PD). The BPD only group was larger than expected-8.4% of patients who met criteria for BPD did not fulfill criteria for significant impairment in the LPFS. The highest burden was found in individuals concurrently showing significant impairment in LPFS and fulfilling BPD diagnosis (LPFS + BPD). Differences between the LPFS only group and the BPD only group were found in risk behavior and traumatic experiences, with higher prevalence in the BPD group. Findings confirm the high psychopathological burden and psychosocial impairment associated with both BPD and LPFS. Those exceeding the diagnostic threshold of LPFS in combination with a BPD diagnosis are characterized by greatest disability. Not all adolescents fulfilling formal BPD diagnosis showed a clinically significant impairment in LPFS, which may refer to a distinct diagnostic group., (© 2024. The Author(s).)
- Published
- 2024
- Full Text
- View/download PDF
72. Overcoming Protein Orientation Mismatch Enables Efficient Nanoscale Light-Driven ATP Production.
- Author
-
Amati AM, Moning SU, Javor S, Schär S, Deutschmann S, Reymond JL, and von Ballmoos C
- Subjects
- Light, Proton Pumps metabolism, Membrane Proteins metabolism, Liposomes metabolism, Adenosine Triphosphate metabolism
- Abstract
Adenosine triphosphate (ATP)-producing modules energized by light-driven proton pumps are powerful tools for the bottom-up assembly of artificial cell-like systems. However, the maximum efficiency of such modules is prohibited by the random orientation of the proton pumps during the reconstitution process into lipid-surrounded nanocontainers. Here, we overcome this limitation using a versatile approach to uniformly orient the light-driven proton pump proteorhodopsin (pR) in liposomes. pR is post-translationally either covalently or noncovalently coupled to a membrane-impermeable protein domain guiding orientation during insertion into preformed liposomes. In the second scenario, we developed a novel bifunctional linker, tris NTA-SpyTag, that allows for the reversible connection of any SpyCatcher-containing protein and a HisTag-carrying protein. The desired protein orientations are verified by monitoring vectorial proton pumping and membrane potential generation. In conjunction with ATP synthase, highly efficient ATP production is energized by the inwardly pumping population. In comparison to other light-driven ATP-producing modules, the uniform orientation allows for maximal rates at economical protein concentrations. The presented technology is highly customizable and not limited to light-driven proton pumps but applicable to many membrane proteins and offers a general approach to overcome orientation mismatch during membrane reconstitution, requiring little to no genetic modification of the protein of interest.
- Published
- 2024
- Full Text
- View/download PDF
73. Talking about dying and death: Essentials of communicating about approaching death from the perspective of major stakeholders.
- Author
-
Felber SJ, Guffi T, Brem BG, Schmitz FM, Schnabel KP, Guttormsen Schär S, Eychmüller S, and Zambrano SC
- Abstract
Objectives: Although caring for dying patients and their family caregivers (FC) is integral to patient care, training in communication about approaching death is almost inexistent in medical and nursing curricula. Consequently, many health professionals have insufficient knowledge about conducting these conversations. In order to gain a broader insight into essential aspects of this communication from different perspectives, we conducted focus groups with key stakeholders., Methods: Medical specialists, nurses, medical students, bereaved FC and patient representatives participated in five focus groups ( n = 30). Following a focus group schedule, we elicited relevant aspects of communication about approaching death, associated emotions, and appropriate communication frameworks. We analyzed data thematically., Results: Four main themes were central to conversations about approaching death: (1) embracing care within medical expertise, (2) preparing the conversation while remaining open to the unexpected, (3) recognizing and reflecting on own emotions and reactions, and (4) establishing a meaningful connection with others., Significance of Results: Communicating about approaching death with dying patients and their FC can be complex and challenging at a professional and personal level. With the recognition of the dying phase, a process is initiated for which health professionals need solid clinical knowledge about but also effective communication skills, constant self-reflection and self-care strategies. Comprehensive training and supervision while dealing with the challenges of communicating approaching death to dying patients and their FC are key, particularly for trainees, less experienced physicians and nurses. The essential components identified in this study can help health professionals to master these conversations.
- Published
- 2023
- Full Text
- View/download PDF
74. Associations between different measures of personality pathology and resting-state autonomic function among adolescents.
- Author
-
Hedinger N, Cosentino M, Mürner-Lavanchy IM, Sigrist C, Schär S, Kaess M, and Koenig J
- Subjects
- Humans, Adolescent, Personality, Diagnostic and Statistical Manual of Mental Disorders, Personality Inventory, Personality Disorders diagnosis, Personality Disorders psychology, Borderline Personality Disorder
- Abstract
Borderline personality disorder (BPD) has been associated with a reduced functional flexibility of the autonomic nervous system (ANS), indexed by decreased vagally mediated heart rate variability (vmHRV). Employing a comprehensive Section II-based assessment approach and a partial Section III-based assessment approach (including Criterion A of the alternative model of personality disorders [AMPD]), the present study investigates how different conceptualizations of personality disorders (PDs) according to the Diagnostic and Statistical Manual for Mental Disorders, 5th edition relate to ANS function. Using the BPD section of the Structured Clinical Interview for DSM-IV Axis II Disorders (SCID-II, a Section II-based assessment approach) and the Semistructured Interview for Personality Functioning DSM-5 (STiP-5.1, a Section III-based assessment approach), we conducted linear regression analyses to examine how categorical (BPD diagnosis) and dimensional (severity and domain) measures of PD are associated with ANS activity among adolescent psychiatric patients ( N = 147, M
age = 15.25 years). Replicating earlier findings, analyses revealed a statistically significant positive association between the SCID-II measures of BPD and heart rate (HR), b = 0.43, t (59) = 3.57, p = .001, f = .57, as well as a statistically significant negative association between the SCID-II measures of BPD and vmHRV, b = -0.34, t (59) = -2.74, p = .008, f = .47. Neither the STiP-5.1 total score nor the subscales of the Level of Personality Functioning Scale (LPFS) were associated with HR or vmHRV. The present findings indicate that the SCID-II may capture features of PD that are more informative of variance in physiological function than the STiP-5.1. (PsycInfo Database Record (c) 2023 APA, all rights reserved).- Published
- 2023
- Full Text
- View/download PDF
75. Combined therapy with ibrutinib and bortezomib followed by ibrutinib maintenance in relapsed or refractory mantle cell lymphoma and high-risk features: a phase 1/2 trial of the European MCL network (SAKK 36/13).
- Author
-
Novak U, Fehr M, Schär S, Dreyling M, Schmidt C, Derenzini E, Zander T, Hess G, Mey U, Ferrero S, Mach N, Boccomini C, Böttcher S, Voegeli M, Cairoli A, Ivanova VS, Menter T, Dirnhofer S, Scheibe B, Gadient S, Eckhardt K, Zucca E, Driessen C, and Renner C
- Abstract
Background: The Bruton's tyrosine kinase inhibitor ibrutinib and the proteasome inhibitor bortezomib have single-agent activity, non-overlapping toxicities, and regulatory approval in mantle cell lymphoma (MCL). In vitro, their combination provides synergistic cytotoxicity. In this investigator-initiated phase 1/2 trial, we established the recommended phase 2 dose of ibrutinib in combination with bortezomib, and assessed its efficacy in patients with relapsed or refractory MCL., Methods: In this phase 1/2 study open in 15 sites in Switzerland, Germany and Italy, patients with relapsed or refractory MCL after ≤2 lines of chemotherapy and both ibrutinib-naïve and bortezomib-naïve received six cycles of ibrutinibb and bortezomib, followed by ibrutinib maintenance. For the phase 1 study, a standard 3 + 3 dose escalation design was used to determine the recommended phase 2 dose of ibrutinib in combination with bortezomib. The primary endpoint in phase 1 was the dose limiting toxicities in cycle 1. The phase 2 study was an open-label, single-arm trial with a Simon's two-stage min-max design, with a primary endpoint of overall response rate (ORR) assessed by CT/MRI. This study was registered with ClinicalTrials.gov, NCT02356458., Findings: Between August 2015 and September 2016, nine patients were treated in the phase 1 study, and 49 patients were treated between November 2016 and March 2020 in the phase 2 of the trial. The ORR was 81.8% (90% CI 71.1, 89.8%, CR(u) 21.8%) which increased with continued ibrutinib (median 10.6 months) to 87.3%, (CR(u) 41.8%). 75.6% of patients had at least one high-risk feature (Ki-67 > 30%, blastoid or pleomorphic variant, p53 overexpression, TP53 mutations and/or deletions). In these patients, ibrutinib and bortezomib were also effective with an ORR of 74%, increasing to 82% during maintenance. With a median follow-up of 25.4 months, the median duration of response was 22.7, and the median PFS was 18.6 months. PFS reached 30.8 and 32.9 months for patients with a CR or Cru, respectively., Interpretation: The combination of ibrutinib and bortezomib shows durable efficacy in patients with relapsed or refractory MCL, also in the presence of high-risk features., Funding: SAKK (Hubacher Fund), Swiss State Secretariat for Education, Research and Innovation, Swiss Cancer Research Foundation, and Janssen., Competing Interests: U.N. reports consulting fees and advisory board participation to/through the institution from and with Janssen-Cilag, Celgene (BMS), Takeda, AstraZeneca, Roche, Novartis, Incyte, Beigene, Kyowa Kirin, Gilead, Pierre Fabre and Miltenyi, payment of honoraria to the institution form Celgene (BMS), Novartis, Takeda, and Gilead, and meeting and/or travel support to the institution from Janssen, Roche, Gilead and Takeda. M.D. reports grants or contracts for research from Abbvie, Bayer, BMS/Celgene, Gilead/Kite, Janssen, and Roche to the institution, payment of honoraria from AstraZeneca, Beigene, Gilead/Kite, Janssen, Lilly, Novartis and Roche, meeting and/or travel support from Janssen and Roche, and Data Safety Monitoring Board or Advisory Boards with Abbvie, AstraZeneca, Beigene, BMS/Celgene, Gilead/Kite, Janssen, Lilly/Loxo, Novartis, and Roche. C.S. reports consulting fees from BMS and Janssen, payments of honoraria from BMS and AstraZeneca, and meeting and/or travel support from Kite Gilead. E.D. reports and research funding from ADC Therapeutics and Takeda, consulting fees from Roche, Beigene, Abbvie, AstraZeneca, and Takeda, payments or honoraria from Abbvie, Roche, Incyte and Beigene, support for meetings and/or travel from Abbvie and Beigene, a Data Safety Monitoring Board or Advisory Board role with Abbvie, Beigene, Takeda, and Roche, and the receipt of equipment, materials, drugs, medical writing, gifts or other services from ADC Therapeutics. T.Z. reports consulting fees from Beigene Switzerland GmbH. G.H. reports grants or contracts for research from Gilead/Kite, Incyte, Janssen, Morphosys, Pfizer, Roche, and Abbvie, consulting fees from Abbvie, ADC Therapeutics, AstraZeneca, BMS, Genmab, Gilead/Kite, Incyte, Janssen, Miltenyi, Novartis, Roche, and Lilly, payments or honoraria from Abbvie, AstraZeneca, Beigene, BMS, Genmab, Gilead, Incyte, Janssen, Lilly, and Roche, meeting and/or travel support from Janssen and Gilead/Kite, and Data Safety Monitoring Board or Advisory Boards with Miltenyi. U.M. reports meeting and/or travel support from Janssen-Cilag, an advisory board role with Janssen-Cilag, and participation in the committee of the German-Swiss-Austrian guidelines for mantle cell lymphoma. S.F. reports grants or contracts for research, consulting fees, honoraria, meeting and/or travel support, and advisory board activities from and with Janssen. S.B. reports grants or contracts for research from Janssen-Cilag Neuss and Miltenyi Bergisch Gladbach to the institution, honoraria from Roche, Abbvie, Janssen, AstraZeneca, and Sanofi, and a travel support from Janssen. E.Z. reports grants or contracts for research from AstraZeneca, Beigene, Celgene, Incyte, Janssen, and Roche, for research to the institution from Incyte, AstraZeneca, Beigene, Celgene/BMS, Merck/MSD, and Roche, honoraria for an educational event from Abbvie, an advisory board role with Abbvie, AstraZeneca, Beigene, Celgene/BMS, Celltrion Healthcare, Curis, Eli Lilly, Gilead/Kite, Incyte, Ipsen, Janssen, MeiPharma, Miltenyi Biomedicine, Merck/MSD, and Roche, Data Safety Monitoring Board activities with Merck/MSD, and meeting and/or travel support from Abbvie, Gilead/Kite, Janssen, and Roche, and an expert statement for Bristol Myers Squib. C.R. reports consulting fees to the institution from Abbvie, Celgene/BMS, and Roche, honoraria to the institution from Amgen, Janssen, Abbvie, Celgene/BMS, and Takeda, payment for expert testimonies to the institution from Gilead and Janssen, and meeting and/or travel support from Sanofi and Amgen. All other authors declare no competing interests., (© 2023 The Authors.)
- Published
- 2023
- Full Text
- View/download PDF
76. Completion and publication of clinical trials in a cooperative group: a cohort study of trials of the Swiss Group for Clinical Cancer Research (SAKK).
- Author
-
Hayoz S, Kasenda B, Schenker AL, Kopp C, Schär S, Thürlimann B, von Moos R, and Pless M
- Subjects
- Humans, Cohort Studies, Research Design, Patient Selection, Ethnicity, Neoplasms therapy
- Abstract
Background: Premature trial discontinuation and non-publication of trial results are still major issues negatively affecting reliable evidence generation., Objectives: To investigate trial completion and publication rate of cancer trials conducted within the Swiss Group for Clinical Cancer Research (SAKK)., Design: Cohort study of clinical trials., Setting: Cohort of interventional cancer trials conducted in Switzerland with accrual closure between 1986 and 2021 identified from the SAKK trial management system., Outcomes: Premature trial discontinuation and publication in peer-reviewed journal., Results: We included 261 trials; median number of recruited patients was 150.5 (range 1-8028). Most trials (67.0%) were randomised. Overall, 76 of 261 (29.1%) trials were prematurely closed for accrual. The three main reasons for premature closure were insufficient accrual in 28 trials, followed by stopping for futility in 17 or efficacy in 8 trials. We included 240 trials for the publication status (21 excluded, because 8 still in follow-up, for 10 the primary completion date was less than a year ago and for 3 the manuscript was submitted, but to accepted yet). 216 of 240 (90.0%) were published as a full article, 14 were published in other formats, leading to an overall publication rate of 95.8%. The rate of premature discontinuation declined over time, with 34.2%, 27.8% and 23.5% in trials activated before 2000, between 2000 and 2009, and since 2010, respectively. We observed an increasing publication rate in peer-reviewed journals over time: 79.2% (closed before 2000), 95.7% (closed between 2000 and 2009) and 93.2% (closed after 2010)., Conclusion: Insufficient patient recruitment is still the major reason for premature trial discontinuation. SAKK has continuously improved its quality management of trial conduct over time leading to increased successful trial completion and publication. However, there is still room for improvement to increase the number of trials reaching their target sample size., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)
- Published
- 2023
- Full Text
- View/download PDF
77. Unrecognized for centuries: distribution and sexual caste descriptions of the West European Aphaenogaster species of the subterranea group (Hymenoptera, Formicidae).
- Author
-
Schifani E, Alicata A, Borowiec L, García F, Gentile V, Gómez K, Nalini E, Rigato F, Schär S, Scupola A, Vila R, and Menchetti M
- Abstract
There are only two Aphaenogaster species from the subterranea group in the western Mediterranean: A.ichnusa Santschi, 1925, from south-western Europe, and A.subterranea (Latreille, 1798), also occurring in central and eastern Europe. Historically, the two species have been widely misunderstood: A.ichnusa was long considered a Sardinian endemic subspecies of A.subterranea , while its continental populations were misidentified as A.subterranea s. str. Recently, A.ichnusa was elevated to species rank and its worker caste was redescribed with that of A.subterranea , allowing for their correct identification. Yet their distribution was documented in detail only for France and Sardinia. Furthermore, no morphological characters were described to distinguish the males and queens of the two species. By investigating private and museum collections, 276 new records of A.ichnusa are provided here and 154 of A.subterranea from the western Mediterranean. Additionally, qualitative and quantitative morphological characters were combined to identify their males and queens. We present the new southernmost, easternmost, and westernmost distribution limits for A.ichnusa . Based on our results, this species is widely distributed in Italy and Catalonia (Spain), also occurring on several Mediterranean islands, avoiding areas with continental climate and high altitudes. Sicily is the only island to host the less thermophilous A.subterranea , which otherwise extends westward to Galicia (Spain). Sympatric occurrence is not rare along the contact zone. Additional natural history observations are reported regarding foraging habits, associated myrmecophiles, habitat preferences, and colony structure in the two species., (Enrico Schifani, Antonio Alicata, Lech Borowiec, Fede García, Vincenzo Gentile, Kiko Gómez, Elia Nalini, Fabrizio Rigato, Sämi Schär, Antonio Scupola, Roger Vila, Mattia Menchetti.)
- Published
- 2023
- Full Text
- View/download PDF
78. Alternate-day dosing of pomalidomide in relapsed/ refractory multiple myeloma: a multicenter, single-arm phase 2 trial.
- Author
-
Zander T, Pabst T, Schär S, Aebi S, Mey U, Novak U, Lerch E, Rhyner Agocs G, Goede J, Maniecka Z, Hayoz S, Rüfer A, Renner C, and Driessen C
- Subjects
- Humans, Thalidomide, Dexamethasone, Antineoplastic Combined Chemotherapy Protocols, Neoplasm Recurrence, Local drug therapy, Multiple Myeloma drug therapy, Neoplasms, Plasma Cell
- Published
- 2023
- Full Text
- View/download PDF
79. Printed Antifouling Electrodes for Biosensing Applications.
- Author
-
Zinggeler M, Schär S, and Kurth F
- Subjects
- Humans, Electrodes, Microelectrodes, Polymers, Antibodies, Electrochemical Techniques, Biofouling prevention & control, Nanostructures, Biosensing Techniques
- Abstract
Biosensors based on miniaturized, functional electrodes are of high potential for various biosensing applications, especially at the point-of-care setting among others. However, the sensor performance of such electrochemical devices is still strongly limited, especially due to surface fouling in complex sample fluids, such as blood serum. Electrode coatings based on conductive nanomaterials embedded in antifouling matrices offer a promising strategy to overcome this limitation. However, known composite coatings require long (typically >24 h) and complex fabrication processes, which pose a strong barrier for cost-effective mass manufacturing and successful commercialization. Here, we describe a novel polymer/carbon nanotube (CNT) composite coating that can be produced from an ink containing a photoreactive and antifouling copolymer as well as conductive CNTs using fast and highly scalable printing processes. Coatings were prepared on screen-printed electrodes and characterized using cyclic voltammetry (CV) and protein fouling experiments. The coatings offered an electroactive surface area (EASA) comparable to uncoated screen-printed electrodes and retained >90% of initial EASA after 1 h of exposure to concentrated bovine serum albumin solution, while uncoated electrodes decreased to <20% of initial EASA after the same treatment. Utilizing the universal crosslinking reaction of the polymer coating, antibodies against the inflammatory biomarker C-reactive protein (CRP) were photochemically immobilized on the electrodes. Functionalized electrodes were fabricated in <2 h and were successfully used to quantify nanogram-range concentrations of CRP spiked in undiluted human blood serum using a sandwich-immunoassay with electrochemical read-out, demonstrating the high potential of the platform for biosensing applications.
- Published
- 2022
- Full Text
- View/download PDF
80. Guilt is effectively induced by a written auto-biographical essay but not reduced by experimental pain.
- Author
-
Schär S, Vehlen A, Ebneter J, Schicktanz N, de Quervain DJF, Wittmann L, Götzmann L, Grosse Holtforth M, Protic S, Wettstein A, Egloff N, Streitberger K, and Schwegler KIM
- Abstract
Introduction: The aim of the present study was (1) to validate the method of guilt-induction by means of a written auto-biographical essay and (2) to test whether experimental pain is apt to alleviate the mental burden of guilt, a concept receiving support from both empirical research and clinical observation., Methods: Three independent groups of healthy male participants were recruited. Group allocation was not randomized but within group pain/sham administration was counterbalanced over the two test-days. Groups were tested in the following consecutive order: Group A: guilt induction, heat-pain/sham, N = 59; Group B: guilt induction, cold-pressure-pain/sham, N = 43; Group C: emotionally neutral induction, heat-pain/sham, N = 39. Guilt was induced on both test-days in group A and B before pain/sham administration. Visual analog scale (VAS) guilt ratings immediately after pain/sham stimulation served as the primary outcome. In a control group C the identical heat-pain experiment was performed like in group A but a neutral emotional state was induced., Results: A consistently strong overall effect of guilt-induction (heat-pain: p < 0.001, effect size r = 0.71; CPT-pain p < 0.001, r = 0.67) was found when compared to the control-condition ( p = 0.25, r = 0.08). As expected, heat- and cold-pressure-stimuli were highly painful in all groups ( p < 0.0001, r = 0.89). However, previous research supporting the hypothesis that pain is apt to reduce guilt was not replicated., Conclusion: Although guilt-induction was highly effective on both test-days no impact of pain on behavioral guilt-ratings in healthy individuals could be identified. Guilt induction per se did not depend on the order of testing. The result questions previous experimental work on the impact of pain on moral emotions., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Schär, Vehlen, Ebneter, Schicktanz, de Quervain, Wittmann, Götzmann, grosse Holtforth, Protic, Wettstein, Egloff, Streitberger and Schwegler.)
- Published
- 2022
- Full Text
- View/download PDF
81. SAKK 35/15: a phase 1 trial of obinutuzumab in combination with venetoclax in patients with previously untreated follicular lymphoma.
- Author
-
Stathis A, Mey U, Schär S, Hitz F, Pott C, Mach N, Krasniqi F, Novak U, Schmidt C, Hohloch K, Kienle DL, Hess D, Moccia AA, Unterhalt M, Eckhardt K, Hayoz S, Forestieri G, Rossi D, Dirnhofer S, Ceriani L, Sartori G, Bertoni F, Buske C, Zucca E, and Hiddemann W
- Subjects
- Antibodies, Monoclonal, Humanized, Antineoplastic Combined Chemotherapy Protocols adverse effects, Bridged Bicyclo Compounds, Heterocyclic, Humans, Positron Emission Tomography Computed Tomography, Sulfonamides, Treatment Outcome, Lymphoma, Follicular drug therapy
- Abstract
This phase 1 study evaluated safety, tolerability, and preliminary efficacy of obinutuzumab in combination with venetoclax in patients with previously untreated grade 1-3a follicular lymphoma in need of systemic therapy. Two DLs of venetoclax were evaluated with an expansion cohort at the recommended phase 2 dose. Twenty-five patients were enrolled. The recommended phase 2 dose was venetoclax 800 mg OD continuously for 6 cycles starting on day 2 of cycle 1, with obinutuzumab 1000 mg on days 1, 8, and 15 of cycle 1 and on day 1 of cycles 2 to 6, followed by obinutuzumab maintenance every 2 months for 2 years. Only 1 patient had a DLT consisting of grade 4 thrombocytopenia after the first obinutuzumab infusion. Neutropenia was the most common adverse event of grade ≥3 at least possibly attributed to study treatment. Twenty-four patients were evaluable for response after cycle 6 by computed tomography (CT) and 19 by positron emission tomography/CT (PET/CT): overall and complete response rates were 87.5% (95% CI, 67.6% to 97.3%) and 25% (95% CI, 9.8% to 46.7%) in the CT-evaluated patients and 84.2% (95% CI, 60.4% to 96.6%) and 68.4% (95% CI, 43.4% to 87.4%), respectively, in the PET/CT-evaluated patients. One-year progression-free survival was 77.8% (95% CI, 54.6% to 90.1%) and 79% (95% CI, 47.9% to 92.7%) for CT and PET/CT-evaluable patients, respectively, whereas progression-free survival at 30 months was 73.2% (95% CI, 49.8%, 87.0%) as assessed by CT and 79.0% (95% CI, 47.9%, 92.7%) by PET/CT. Despite the activity observed, our results do not support further development of the combination in this patient population. This trial was registered at www.clinicaltrials.gov as #NCT02877550., (© 2022 by The American Society of Hematology. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0), permitting only noncommercial, nonderivative use with attribution. All other rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
82. Child maltreatment and hypothalamic-pituitary-adrenal axis functioning: A systematic review and meta-analysis.
- Author
-
Schär S, Mürner-Lavanchy I, Schmidt SJ, Koenig J, and Kaess M
- Subjects
- Child, Corticotropin-Releasing Hormone, Humans, Hydrocortisone, Hypothalamo-Hypophyseal System, Child Abuse, Pituitary-Adrenal System
- Abstract
Alterations in hypothalamic-pituitary-adrenal (HPA) axis and its effector hormone cortisol have been proposed as one possible mechanism linking child maltreatment experiences to health disparities. In this series of meta-analyses, we aimed to quantify the existing evidence on the effect of child maltreatment on various measures of HPA axis activity. The systematic literature search yielded 1,858 records, of which 87 studies (k = 132) were included. Using random-effects models, we found evidence for blunted cortisol stress reactivity in individuals exposed to child maltreatment. In contrast, no overall differences were found in any of the other HPA axis activity measures (including measures of daily activity, cortisol assessed in the context of pharmacological challenges and cumulative measures of cortisol secretion). The impact of several moderators (e.g., sex, psychopathology, study quality), the role of methodological shortcomings of existing studies, as well as potential directions for future research are discussed., (Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
83. Adherence to Contouring and Treatment Planning Requirements Within a Multicentric Trial: Results of the Quality Assurance of the SAKK 09/10 trial.
- Author
-
Beck M, Sassowsky M, Schär S, Mathier E, Halter M, Zwahlen DR, Hölscher T, Arnold W, Polat B, Hildebrandt G, Müller AC, Putora PM, Papachristofilou A, Hayoz S, Schär C, Li Q, Sumila M, Zaugg K, Guckenberger M, Ost P, Bosetti DG, Reuter C, Gomez S, Khanfir K, Aebersold DM, Ghadjar P, and Pra AD
- Subjects
- Humans, Male, Prostatectomy, Rectum, Salvage Therapy methods, Gastrointestinal Diseases etiology, Prostatic Neoplasms diagnostic imaging, Prostatic Neoplasms radiotherapy, Radiotherapy, Intensity-Modulated methods
- Abstract
Purpose: To evaluate the results of the radiation therapy (RT) quality assurance (QA) program of the phase 3 randomized SAKK 09/10 trial in patients with biochemically recurrent prostate cancer after prostatectomy., Methods and Materials: Within the Schweizerische Arbeitsgemeinschaft für Klinische Krebsforschung (SAKK) 09/10 trial testing 64-Gy versus 70-Gy salvage RT, a central collection of treatment plans was performed and thoroughly reviewed by a dedicated medical physicist and radiation oncologist. Adherence to the treatment protocol and specifically to the European Organization for the Research and Treatment of Cancer (EORTC) guidelines for target volume definition (classified as deviation observed yes vs no) and its potential correlation with acute and late toxicity (Common Terminology Criteria for Adverse Events version 4.0) and freedom from biochemical progression (FFBP) were investigated., Results: The treatment plans for 344 patients treated between February 2011 and April 2014 depicted important deviations from the EORTC guidelines and the recommendations per trial protocol. For example, in up to half of the cases, the delineated structures deviated from the protocol (eg, prostate bed in 48.8%, rectal wall [RW] in 41%). In addition, variations in clinical target volume (CTV) and planning target volume (PTV) occurred frequently (eg, CTV and PTV deviations in up to 42.4% and 25.9%, respectively). The detected deviations showed a significant association with a lower risk of grade ≥2 gastrointestinal acute toxicity when the CTV did not overlap the RW versus when the CTV overlapped the RW (odds ratio [OR], 0.43; 95% confidence interval [CI], 0.22-0.85; P = .014), and a higher rate of grade ≥2 late genitourinary (GU) toxicity when the CTV overlapped the RW (OR, 2.58; 95% CI, 1.17-5.72; P = .019). A marginally significant lower risk of grade ≥2 late GU toxicity was observed when the prostate bed did not overlap versus did overlap the RW (OR, 0.51; 95% CI, 0.25-1.03; P = .06). In addition, a marginally significant decrease in FFBP was observed in patients with PTV not including surgical clips as potential markers of the limits of the prostate bed (hazard ratio, 1.44; 95% CI, 0.96-2.17; P = .07)., Conclusions: Despite a thorough QA program, the central review of a phase 3 trial showed limited adherence to treatment protocol recommendations, which was associated with a higher risk of toxicity by means of acute or late gastrointestinal or GU toxicity and showed a trend toward worse FFBP. Data from this QA review might help to refine future QA programs and prostate bed delineation guidelines., (Copyright © 2022 Elsevier Inc. All rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
84. Integrative taxonomy reveals cryptic diversity in North American Lasius ants, and an overlooked introduced species.
- Author
-
Schär S, Talavera G, Rana JD, Espadaler X, Cover SP, Shattuck SO, and Vila R
- Subjects
- Animals, DNA, Mitochondrial genetics, Ecosystem, Introduced Species, Phylogeny, Ants genetics
- Abstract
Biological invasions are a grave threat to ecosystems. The black garden ant (Lasius niger) is a pest species in Europe. Current literature states that L. niger occupies a disjunct native distribution in the Holarctic, however, based on recent work, we re-evaluate this distribution. The native range of L. niger is reconsidered based on phylogenetic relationships (nine mitochondrial and nuclear markers, 5670 bp), DNA-barcoding (98 Holarctic specimens), morphometry (88 Holarctic specimens, 19 different measurements) and subjective assessment of phenotype. The potential spread of this species is estimated using ecological niche modeling. Lasius niger is more closely related to other Palearctic species than to the Nearctic ants known under this name. The latter are described as a distinct species, L. ponderosae sp. nov. However, DNA-barcoding discovered established populations of L. niger in metropolitan areas in Canada (Vancouver and Halifax). We describe a morphometrical method to delineate L. ponderosae sp. nov. and L. niger. MtDNA diversity and divergence is high within L. ponderosae sp. nov., but low within L. niger. More than 1,000,000 km
2 are suitable as a habitat for L. niger in North America. This case emphasizes the critical role of integrative taxonomy to detect cryptic species and identify potential biological invasions in their nascent stages., (© 2022. The Author(s).)- Published
- 2022
- Full Text
- View/download PDF
85. Pituitary volume in adolescents with non-suicidal self-injury: Preliminary evidence for alterations in pituitary maturation.
- Author
-
Schär S, Mürner-Lavanchy I, Slavova N, Lerch S, Reichl C, Brunner R, Koenig J, and Kaess M
- Subjects
- Adolescent, Humans, Hydrocortisone, Pituitary Gland diagnostic imaging, Pituitary-Adrenal System, Hypothalamo-Hypophyseal System, Self-Injurious Behavior
- Abstract
Background: Non-suicidal self-injury (NSSI), typically observed in the context of various mental disorders, represents a highly prevalent and serious problem among adolescents. Based on studies linking NSSI with stress, alterations in hypothalamic-pituitary-adrenal (HPA) axis functioning have been suggested to contribute to the development and maintenance of this behavior. While research has mainly focused on cortisol - the main hormonal output of this system - to our knowledge, no study has examined pituitary gland volume (PGV) - an alternative approach of assessing HPA axis functionality that is less state-dependent - in adolescents engaging in NSSI., Methods: Magnetic Resonance Imaging (MRI) was performed among n = 35 adolescents (aged 12-17 years) fulfilling the diagnostic criteria for NSSI disorder according to DSM-5 and n = 31 age-matched healthy controls; PGV was obtained by manual tracing. To test for group differences - our primary aim - a hierarchical linear regression model was computed, controlling for several potential confounding variables. Since adolescence reflects a time period for significant brain development - including changes in PGV - we also tested for an age-dependent group effect. In a second step, we aimed to investigate whether differences in PGV are accounted for by the experience of childhood adversity or psychopathology. Finally, following an exploratory approach, the dimensional association between PGV and various clinical characteristics (e.g., frequency of NSSI) were explored., Results: No evidence was found for overall volumetric differences between healthy control participants and adolescents engaging in NSSI (p > 0.05) - recognizing that small effect size differences could not be detected in the present study - but group membership significantly interacted with age in predicting PGV (p = 0.02). Particularly, while PGV increased linearly with age in healthy controls (B = 61.39, SE = 14.94, p < 0.01), no corresponding association was found in NSSI patients (B = 16.83, SE = 12.20, p = 0.17). PGV was not related to adverse experiences during childhood and none of the clinical characteristics (e.g., frequency of NSSI) significantly correlated with PGV (p > 0.05)., Conclusion: These results provide preliminary evidence for alterations in pituitary maturation in adolescents engaging in NSSI, although replication in longitudinal studies with larger samples is warranted., (Copyright © 2022 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
86. Integration of Baseline Metabolic Parameters and Mutational Profiles Predicts Long-Term Response to First-Line Therapy in DLBCL Patients: A Post Hoc Analysis of the SAKK38/07 Study.
- Author
-
Genta S, Ghilardi G, Cascione L, Juskevicius D, Tzankov A, Schär S, Milan L, Pirosa MC, Esposito F, Ruberto T, Giovanella L, Hayoz S, Mamot C, Dirnhofer S, Zucca E, and Ceriani L
- Abstract
Accurate estimation of the progression risk after first-line therapy represents an unmet clinical need in diffuse large B-cell lymphoma (DLBCL). Baseline (18)F-fluorodeoxyglucose positron emission tomography/computed tomography (PET/CT) parameters, together with genetic analysis of lymphoma cells, could refine the prediction of treatment failure. We evaluated the combined impact of mutation profiling and baseline PET/CT functional parameters on the outcome of DLBCL patients treated with the R-CHOP14 regimen in the SAKK38/07 clinical trial (NCT00544219). The concomitant presence of mutated SOCS1 with wild-type CREBBP and EP300 defined a group of patients with a favorable prognosis and 2-year progression-free survival (PFS) of 100%. Using an unsupervised recursive partitioning approach, we generated a classification-tree algorithm that predicts treatment outcomes. Patients with elevated metabolic tumor volume (MTV) and high metabolic heterogeneity (MH) (15%) had the highest risk of relapse. Patients with low MTV and favorable mutational profile (9%) had the lowest risk, while the remaining patients constituted the intermediate-risk group (76%). The resulting model stratified patients among three groups with 2-year PFS of 100%, 82%, and 42%, respectively ( p < 0.001).
- Published
- 2022
- Full Text
- View/download PDF
87. Generation and validation of a PET radiomics model that predicts survival in diffuse large B cell lymphoma treated with R-CHOP14: A SAKK 38/07 trial post-hoc analysis.
- Author
-
Ceriani L, Milan L, Cascione L, Gritti G, Dalmasso F, Esposito F, Pirosa MC, Schär S, Bruno A, Dirnhofer S, Giovanella L, Hayoz S, Mamot C, Rambaldi A, Chauvie S, and Zucca E
- Subjects
- Aged, Clinical Trials as Topic, Cyclophosphamide administration & dosage, Female, Follow-Up Studies, Humans, Lymphoma, Large B-Cell, Diffuse diagnostic imaging, Lymphoma, Large B-Cell, Diffuse drug therapy, Lymphoma, Large B-Cell, Diffuse pathology, Male, Middle Aged, Prednisone administration & dosage, Prognosis, Retrospective Studies, Rituximab administration & dosage, Survival Rate, Vincristine administration & dosage, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Fluorodeoxyglucose F18 metabolism, Lymphoma, Large B-Cell, Diffuse mortality, Positron Emission Tomography Computed Tomography methods, Radiopharmaceuticals metabolism
- Abstract
Functional parameters from positron emission tomography (PET) seem promising biomarkers in various lymphoma subtypes. This study investigated the prognostic value of PET radiomics in diffuse large B-cell lymphoma (DLBCL) patients treated with R-CHOP given either every 14 (testing set) or 21 days (validation set). Using the PyRadiomics Python package, 107 radiomics features were extracted from baseline PET scans of 133 patients enrolled in the Swiss Group for Clinical Cancer Research 38/07 prospective clinical trial (SAKK 38/07) [ClinicalTrial.gov identifier: NCT00544219]. The international prognostic indices, the main clinical parameters and standard PET metrics, together with 52 radiomics uncorrelated features (selected using the Spearman correlation test) were included in a least absolute shrinkage and selection operator (LASSO) Cox regression to assess their impact on progression-free (PFS), cause-specific (CSS), and overall survival (OS). A linear combination of the resulting parameters generated a prognostic radiomics score (RS) whose area under the curve (AUC) was calculated by receiver operating characteristic analysis. The RS efficacy was validated in an independent cohort of 107 DLBCL patients. LASSO Cox regression identified four radiomics features predicting PFS in SAKK 38/07. The derived RS showed a significant capability to foresee PFS in both testing (AUC, 0.709; p < 0.001) and validation (AUC, 0.706; p < 0.001) sets. RS was significantly associated also with CSS and OS in testing (CSS: AUC, 0.721; p < 0.001; OS: AUC, 0.740; p < 0.001) and validation (CSS: AUC, 0.763; p < 0.0001; OS: AUC, 0.703; p = 0.004) sets. The RS allowed risk classification of patients with significantly different PFS, CSS, and OS in both cohorts showing better predictive accuracy respect to clinical international indices. PET-derived radiomics may improve the prediction of outcome in DLBCL patients., (© 2022 John Wiley & Sons Ltd.)
- Published
- 2022
- Full Text
- View/download PDF
88. Indigo-A New Tribological Substance Class for Non-Toxic and Ecological Gliding Surfaces on Ice, Snow, and Water.
- Author
-
Bützer P, Brühwiler D, Bützer MR, Al-Godari N, Cadalbert M, Giger M, and Schär S
- Abstract
The biogenic substance E-indigo can form supramolecular, hydrophobic structures using self-organization. These structures show a low coefficient of friction as a gliding layer against polar surfaces. The formation of primary particles with platelet morphology based on hydrogen-bonded E-indigo molecules is ideal to produce the gliding layer. Structures with excellent gliding properties can be achieved by means of directed friction and high pressure, as well as through tempering. The resulting hard, thin gliding layer of E-indigo does not easily absorb dirt and, thus, prevents a rapid increase in friction. Field tests on snow, with cross-country skis, have shown promising results in comparison to fluorinated and non-fluorinated waxes. Based on quantitative structure-activity relationship (QSAR) data for E-indigo, and its isomers and tautomers, it has been demonstrated that both the application and abrasion of the thin indigo layers are harmless to health, and are ecologically benign and, therefore, sustainable.
- Published
- 2022
- Full Text
- View/download PDF
89. Enhanced mechanical energy conversion with selectively decayed wood.
- Author
-
Sun J, Guo H, Schädli GN, Tu K, Schär S, Schwarze FWMR, Panzarasa G, Ribera J, and Burgert I
- Abstract
Producing electricity from renewable sources and reducing its consumption by buildings are necessary to meet energy and climate change challenges. Wood is an excellent "green" building material and, owing to its piezoelectric behavior, could enable direct conversion of mechanical energy into electricity. Although this phenomenon has been discovered decades ago, its exploitation as an energy source has been impaired by the ultralow piezoelectric output of native wood. Here, we demonstrate that, by enhancing the elastic compressibility of balsa wood through a facile, green, and sustainable fungal decay pretreatment, the piezoelectric output is increased over 55 times. A single cube (15 mm by 15 mm by 13.2 mm) of decayed wood is able to produce a maximum voltage of 0.87 V and a current of 13.3 nA under 45-kPa stress. This study is a fundamental step to develop next-generation self-powered green building materials for future energy supply and mitigation of climate change., (Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)
- Published
- 2021
- Full Text
- View/download PDF
90. Prognostic value of POD24 validation in follicular lymphoma patients initially treated with chemotherapy-free regimens in a pooled analysis of three randomized trials of the Swiss Group for Clinical Cancer Research (SAKK).
- Author
-
Moccia AA, Schär S, Hayoz S, Pirosa MC, Taverna C, Novak U, Kimby E, Ghielmini M, and Zucca E
- Subjects
- Adult, Aged, Aged, 80 and over, Disease-Free Survival, Female, Humans, Male, Middle Aged, Recurrence, Survival Rate, Immunotherapy, Lymphoma, Follicular mortality, Lymphoma, Follicular therapy
- Abstract
The relapse of follicular lymphoma (FL) within 24 months (POD24) of chemoimmunotherapy has been associated with poor survival. We analyzed a pooled dataset of three randomized trials including FL patients with advanced disease, conducted by the Swiss Group for Clinical Cancer Research (SAKK). Overall, POD24 was observed in 27% of 318 patients, but rate variance among studies suggested that the rituximab schedule might affect POD24 rate. POD24 was associated with lower 10-year overall survival rates than in the reference group (69% vs. 77%; hazard ratio, 3·12; 95% confidence interval, 1·73-5·65). POD24 retains its prognostic validity in patients treated without chemotherapy and may represent a useful end-point for future studies., (© 2020 British Society for Haematology and John Wiley & Sons Ltd.)
- Published
- 2021
- Full Text
- View/download PDF
91. Prolonged rituximab maintenance in follicular lymphoma patients: long-term results of the SAKK 35/03 randomized trial.
- Author
-
Moccia AA, Taverna C, Schär S, Vanazzi A, Rondeau S, Hitz F, Mingrone W, Pabst T, Cevreska L, Del Giglio A, Raats J, Rauch D, Vorobiof DA, Lohri A, Ruegsegger C, Biaggi Rudolf C, Rusterholz C, Hayoz S, Ghielmini M, and Zucca E
- Subjects
- Humans, Progression-Free Survival, Rituximab, Survival Rate, Lymphoma, Follicular drug therapy, Neoplasms, Second Primary
- Abstract
The Swiss Group for Clinical Cancer Research (SAKK) conducted the SAKK 35/03 randomized trial (NCT00227695) to investigate different rituximab monotherapy schedules in patients with follicular lymphoma (FL). Here, we report their long-term treatment outcome. Two-hundred and seventy FL patients were treated with 4 weekly doses of rituximab monotherapy (375 mg/m2); 165 of them, achieving at least a partial response, were randomly assigned to maintenance rituximab (375 mg/m2 every 2 months) on a short-term (4 administrations; n = 82) or a long-term (up to a maximum of 5 years; n = 83) schedule. The primary end point was event-free survival (EFS). At a median follow-up period of 10 years, median EFS was 3.4 years (95% confidence interval [CI], 2.1-5.5) in the short-term arm and 5.3 years (95% CI, 3.5-7.5) in the long-term arm. Using the prespecified log-rank test, this difference is not statistically significant (P = .39). There also was not a statistically significant difference in progression-free survival or overall survival (OS). Median OS was 11.0 years (95% CI, 11.0-NA) in the short-term arm and was not reached in the long-term arm (P = .80). The incidence of second cancers was similar in the 2 arms (9 patients after short-term maintenance and 10 patients after long-term maintenance). No major late toxicities emerged. No significant benefit of prolonged maintenance became evident with longer follow-up. Notably, in symptomatic patients in need of immediate treatment, the 10-year OS rate was 83% (95% CI, 73-89%). These findings indicate that single-agent rituximab may be a valid first-line option for symptomatic patients with advanced FL., (© 2020 by The American Society of Hematology.)
- Published
- 2020
- Full Text
- View/download PDF
92. Prognostic models integrating quantitative parameters from baseline and interim positron emission computed tomography in patients with diffuse large B-cell lymphoma: post-hoc analysis from the SAKK38/07 clinical trial.
- Author
-
Zucca E, Cascione L, Ruberto T, Facchinelli D, Schär S, Hayoz S, Dirnhofer S, Giovanella L, Bargetzi M, Mamot C, and Ceriani L
- Subjects
- Antineoplastic Combined Chemotherapy Protocols adverse effects, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Biomarkers, Cyclophosphamide adverse effects, Cyclophosphamide therapeutic use, Doxorubicin adverse effects, Doxorubicin therapeutic use, Female, Humans, Kaplan-Meier Estimate, Lymphoma, Large B-Cell, Diffuse drug therapy, Lymphoma, Large B-Cell, Diffuse etiology, Lymphoma, Large B-Cell, Diffuse mortality, Male, Prednisone adverse effects, Prednisone therapeutic use, Prognosis, ROC Curve, Vincristine adverse effects, Vincristine therapeutic use, Lymphoma, Large B-Cell, Diffuse diagnosis, Positron Emission Tomography Computed Tomography methods, Positron Emission Tomography Computed Tomography standards
- Abstract
Positron emission computed tomography (PET/CT) in patients with diffuse large B-cell lymphoma (DLBCL) enrolled in a prospective clinical trial were reviewed to test the impact of quantitative parameters from interim PET/CT scans on overall (OS) and progression-free (PFS) survival. We centrally reviewed baseline and interim PET/CT scans of 138 patients treated with rituximab plus cyclophosphamide, doxorubicin, vincristine and prednisone given every 14 days (R-CHOP14) in the SAKK38/07 trial (ClinicalTrial.gov identifier: NCT00544219). Cutoff values for maximum standardized uptake value (SUV
max ), metabolic tumor volume (MTV), total lesion glycolysis (TLG) and metabolic heterogeneity (MH) were defined by receiver operating characteristic analysis. Responses were scored using the Deauville scale (DS). Patients with DS 5 at interim PET/CT (defined by uptake >2 times higher than in normal liver) had worse PFS (P = 0.014) and OS (P < 0.0001). A SUVmax reduction (Δ) greater than 66% was associated with longer PFS (P = 0.0027) and OS (P < 0.0001). Elevated SUVmax , MTV, TLG, and MH at interim PET/CT also identified patients with poorer outcome. At multivariable analysis, ΔSUVmax and baseline MTV appeared independent outcome predictors. A prognostic model integrating ΔSUVmax and baseline MTV discriminated three risk groups with significantly (log-rank test for trend, P < 0.0001) different PFS and OS. Moreover, the integration of MH and clinical prognostic indices could further refine the prediction of OS. PET metrics-derived prognostic models perform better than the international indices alone. Integration of baseline and interim PET metrics identified poor-risk DLBCL patients who might benefit from alternative treatments., (© 2020 John Wiley & Sons Ltd.)- Published
- 2020
- Full Text
- View/download PDF
93. Activity of Platinum-Based Chemotherapy in Patients With Advanced Prostate Cancer With and Without DNA Repair Gene Aberrations.
- Author
-
Schmid S, Omlin A, Higano C, Sweeney C, Martinez Chanza N, Mehra N, Kuppen MCP, Beltran H, Conteduca V, Vargas Pivato de Almeida D, Cotait Maluf F, Oh WK, Tsao CK, Sartor O, Ledet E, Di Lorenzo G, Yip SM, Chi KN, Bianchini D, De Giorgi U, Hansen AR, Beer TM, Lavaud P, Morales-Barrera R, Tucci M, Castro E, Karalis K, Bergman AM, Le ML, Zürrer-Härdi U, Pezaro C, Suzuki H, Zivi A, Klingbiel D, Schär S, and Gillessen S
- Subjects
- Adult, Aged, Aged, 80 and over, Antineoplastic Agents therapeutic use, Docetaxel therapeutic use, Drug Therapy methods, Drug Therapy statistics & numerical data, Humans, Male, Middle Aged, Paclitaxel therapeutic use, Retrospective Studies, DNA Repair-Deficiency Disorders drug therapy, Drug Therapy standards, Platinum Compounds therapeutic use, Prostatic Neoplasms therapy
- Abstract
Importance: DNA repair gene aberrations occur in 20% to 30% of patients with castration-resistant prostate cancer (CRPC), and some of these aberrations have been associated with sensitivity to poly(ADP-ribose) polymerase (PARP) inhibition platinum-based treatments. However, previous trials assessing platinum-based treatments in patients with CRPC have mostly included a biomarker-unselected population; therefore, efficacy in these patients is unknown., Objective: To characterize the antitumor activity of platinum-based therapies in men with CRPC with or without DNA repair gene alterations., Design, Setting, and Participants: In this case series, data from 508 patients with CRPC treated with platinum-based therapy were collected from 25 academic centers from 12 countries worldwide. Patients were grouped by status of DNA repair gene aberrations (ie, cohort 1, present; cohort 2, not detected; and cohort 3, not tested). Data were collected from January 1986 to December 2018. Data analysis was performed in 2019, with data closure in April 2019., Exposure: Treatment with platinum-based compounds either as monotherapy or combination therapy., Main Outcomes and Measures: The primary end points were as follows: (1) antitumor activity of platinum-based therapy, defined as a decrease in prostate-specific antigen (PSA) level of at least 50% and/or radiological soft tissue response in patients with measurable disease and (2) the association of response with the presence or absence of DNA repair gene aberrations., Results: A total of 508 men with a median (range) age of 61 (27-88) years were included in this analysis. DNA repair gene aberrations were present in 80 patients (14.7%; cohort 1), absent in 98 (19.3%; cohort 2), and not tested in 330 (65.0%; cohort 3). Of 408 patients who received platinum-based combination therapy, 338 patients (82.8%) received docetaxel, paclitaxel, or etoposide, and 70 (17.2%) received platinum-based combination treatment with another partner. A PSA level decrease of at least 50% was seen in 33 patients (47.1%) in cohort 1 and 26 (36.1%) in cohort 2 (P = .20). In evaluable patients, soft tissue responses were documented in 28 of 58 patients (48.3%) in cohort 1 and 21 of 67 (31.3%) in cohort 2 (P = .07). In the subgroup of 44 patients with BRCA2 gene alterations, PSA level decreases of at least 50% were documented in 23 patients (63.9%) and soft tissue responses in 17 of 34 patients (50.0%) with evaluable disease. In cohort 3, PSA level decreases of at least 50% and soft tissue responses were documented in 81 of 284 patients (28.5%) and 38 of 185 patients (20.5%) with evaluable disease, respectively., Conclusions and Relevance: In this study, platinum-based treatment was associated with relevant antitumor activity in a biomarker-positive population of patients with advanced prostate cancer with DNA repair gene aberrations. The findings of this study suggest that platinum-based treatment may be considered an option for these patients.
- Published
- 2020
- Full Text
- View/download PDF
94. Guideline-based indicators for adult patients with myelodysplastic syndromes.
- Author
-
Stojkov K, Silzle T, Stussi G, Schwappach D, Bernhard J, Bowen D, Čermák J, Dinmohamed AG, Eeltink C, Eggmann S, Fenaux P, Germing U, Haschke M, Hellstrom-Lindberg E, Heger M, van de Loosdrecht AA, Passweg J, Pfeilstöcker M, Platzbecker U, Malcovati L, de Almeida AM, Mittelman M, Morgenthaler C, Steensma DP, Santini V, Stauder R, Symeonidis A, Schär S, Maddox C, de Witte T, Bohlius J, and Bonadies N
- Subjects
- Adult, Aged, Humans, Myelodysplastic Syndromes diagnosis, Myelodysplastic Syndromes therapy
- Abstract
Myelodysplastic syndromes (MDSs) represent a heterogeneous group of hematological stem cell disorders with an increasing burden on health care systems. Evidence-based MDS guidelines and recommendations (G/Rs) are published but do not necessarily translate into better quality of care if adherence is not maintained in daily clinical practice. Guideline-based indicators (GBIs) are measurable elements for the standardized assessment of quality of care and, thus far, have not been developed for adult MDS patients. To this end, we screened relevant G/Rs published between 1999 and 2018 and aggregated all available information as candidate GBIs into a formalized handbook as the basis for the subsequent consensus rating procedure. An international multidisciplinary expert panel group (EPG) of acknowledged MDS experts (n = 17), health professionals (n = 7), and patient advocates (n = 5) was appointed. The EPG feedback rates for the first and second round were 82% (23 of 28) and 96% (26 of 27), respectively. A final set of 29 GBIs for the 3 domains of diagnosis (n = 14), therapy (n = 8), and provider/infrastructural characteristics (n = 7) achieved the predefined agreement score for selection (>70%). We identified shortcomings in standardization of patient-reported outcomes, toxicity, and geriatric assessments that need to be optimized in the future. Our GBIs represent the first comprehensive consensus on measurable elements addressing best practice performance, outcomes, and structural resources. They can be used as a standardized instrument with the goal of assessing, comparing, and fostering good quality of care within clinical development cycles in the daily care of adult MDS patients., (© 2020 by The American Society of Hematology.)
- Published
- 2020
- Full Text
- View/download PDF
95. Outcomes with immune checkpoint inhibitors for relapsed small-cell lung cancer in a Swiss cohort.
- Author
-
Schmid S, Mauti LA, Friedlaender A, Blum V, Rothschild SI, Bouchaab H, Frösch P, Britschgi C, König D, Wannesson L, Janthur WD, Schär S, Demmer I, Addeo A, Jochum W, and Früh M
- Subjects
- Adult, Aged, Antibodies, Monoclonal, Humanized administration & dosage, Biomarkers, Tumor analysis, Female, Follow-Up Studies, Humans, Ipilimumab administration & dosage, Lung Neoplasms drug therapy, Lung Neoplasms immunology, Lung Neoplasms pathology, Male, Middle Aged, Neoplasm Recurrence, Local drug therapy, Neoplasm Recurrence, Local immunology, Neoplasm Recurrence, Local pathology, Nivolumab administration & dosage, Prognosis, Retrospective Studies, Small Cell Lung Carcinoma drug therapy, Small Cell Lung Carcinoma immunology, Small Cell Lung Carcinoma pathology, Survival Rate, Switzerland, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Immunotherapy mortality, Lung Neoplasms mortality, Neoplasm Recurrence, Local mortality, Small Cell Lung Carcinoma mortality
- Abstract
Objectives: Early clinical trials showed promising outcomes with immune-checkpoint inhibitors (ICI) in a subset of patients with relapsed small-cell lung carcinoma (SCLC). The aim of this retrospective analysis was to assess the efficacy and safety of ICI for relapsed SCLC in a real-world patient population., Methods: Nine cancer centres in Switzerland contributed data to this cohort. Responses were assessed by the local investigators using standard RECIST v1.1 criteria. Progression-free survival (PFS) and overall survival (OS) were analysed by the Kaplan-Meier method. Associations between potential predictive markers and survival endpoints were probed by Cox proportional hazards., Results: Forty-five patients were included in the analysis. Median age was 63 years, 73% were males and 18% had an ECOG performance status (PS) ≥ 2. ICIs were given as second-line treatment in 60%. Twenty-four patients (53%) received ipilimumab with nivolumab. Twenty-eight patients (62%) had undergone irradiation (RT) prior to or during ICI. Overall response rate (ORR) was 29% and median PFS and OS were 2.3 and 6.5 months, respectively. Median duration of response was 9 months (95% CI 2.8-NA). Five patients maintained their response for > 6 months, all of them receiving combination treatment. There were no new safety signals., Conclusion: This is the first report of "real-world" data on ICI in relapsed SCLC also including patients with poor PS. Promising durable responses were observed. No biological prognostic marker could be identified.
- Published
- 2020
- Full Text
- View/download PDF
96. Monitoring the influx of new species through citizen science: the first introduced ant in Denmark.
- Author
-
Sheard JK, Sanders NJ, Gundlach C, Schär S, and Larsen RS
- Abstract
Climate change and invasive species threaten biodiversity, yet rigorous monitoring of their impact can be costly. Citizen science is increasingly used as a tool for monitoring exotic species, because citizens are geographically and temporally dispersed, whereas scientists tend to cluster in museums and at universities. Here we report on the establishment of the first exotic ant taxon ( Tetramorium immigrans ) in Denmark, which was discovered by children participating in The Ant Hunt. The Ant Hunt is a citizen science project for children that we ran in 2017 and 2018, with a pilot study in 2015. T. immigrans was discovered in the Botanical Garden of the Natural History Museum of Denmark in 2015 and confirmed as established in 2018. This finding extends the northern range boundary of T. immigrans by almost 460 km. Using climatic niche modelling, we compared the climatic niche of T. immigrans in Europe with that of T. caespitum based on confirmed observations from 2006 to 2019. T. immigrans and T. caespitum had a 13% niche overlap, with T. immigrans showing stronger occurrence in warmer and drier areas compared to T. caespitum . Mapping the environmental niches onto geographic space identified several, currently uninhabited, areas as climatically suitable for the establishment of T. immigrans . Tetramorium immigrans was sampled almost three times as often in areas with artificial surfaces compared to T. caespitum , suggesting that T. immigrans may not be native to all of Europe and is being accidentally introduced by humans. Overall, citizen scientists collected data on ants closer to cities and harbours than scientists did and had a stronger bias towards areas of human disturbance. This increased sampling effort in areas of likely introduction of exotic species naturally increases the likelihood of discovering species sooner, making citizen science an excellent tool for exotic species monitoring, as long as trained scientists are involved in the identification process., Competing Interests: The authors declare that they have no competing interests., (© 2020 Sheard et al.)
- Published
- 2020
- Full Text
- View/download PDF
97. SAKK38/07 study: integration of baseline metabolic heterogeneity and metabolic tumor volume in DLBCL prognostic model.
- Author
-
Ceriani L, Gritti G, Cascione L, Pirosa MC, Polino A, Ruberto T, Stathis A, Bruno A, Moccia AA, Giovanella L, Hayoz S, Schär S, Dirnhofer S, Rambaldi A, Martinelli G, Mamot C, and Zucca E
- Subjects
- Humans, Kaplan-Meier Estimate, Prognosis, Prospective Studies, Reproducibility of Results, Tumor Burden, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Lymphoma, Large B-Cell, Diffuse drug therapy
- Abstract
Several functional parameters from baseline (18)F-fluorodeoxyglucose positron emission tomography (PET)/computed tomography have been proposed as promising biomarkers of treatment efficacy in diffuse large B-cell lymphoma (DLBCL). We tested their ability to predict outcome in 2 cohorts of DLBCL patients receiving conventional immunochemotherapy (rituximab, cyclophosphamide, doxorubicin hydrochloride, vincristine sulfate, and prednisone [R-CHOP] regimen), either every 14 (R-CHOP14) or 21 days (R-CHOP21). Baseline PET analysis was performed in 141 patients with DLBCL treated with R-CHOP14 in the prospective SAKK38/07 study (NCT00544219) of the Swiss Group for Clinical Cancer Research (testing set). Reproducibility was examined in a validation set of 113 patients treated with R-CHOP21. In the SAKK38/07 cohort, progression-free survival (PFS) at 5 years was 83% for patients with low metabolic tumor volume (MTV) and 59% for those with high MTV (hazard ratio [HR], 3.4; 95% confidence interval [CI], 1.6-7.0; P = .0005), whereas overall survival (OS) was 91% and 64%, respectively (HR, 4.4; 95% CI, 1.9-10; P = .0001). MTV was the most powerful predictor of outcome also in the validation set. Elevated metabolic heterogeneity (MH) significantly predicted poorer outcomes in the subgroups of patients with elevated MTV. A model integrating MTV and MH identified high-risk patients with shorter PFS (testing set: HR, 5.6; 95% CI, 1.8-17; P < .0001; validation set: HR, 5.6; 95% CI, 1.7-18; P = .0002) and shorter OS (testing set: HR, 9.5; 95% CI, 1.7-52; P < .0001; validation set: HR, 7.6; 95% CI, 2.0-28; P = .0003). This finding was confirmed by an unsupervised regression tree analysis indicating that prognostic models based on MTV and MH may allow early identification of refractory patients who might benefit from treatment intensification. This trial was registered at www.clinicaltrials.gov as #NCT00544219., (© 2020 by The American Society of Hematology.)
- Published
- 2020
- Full Text
- View/download PDF
98. Ecological specialization is associated with genetic structure in the ant-associated butterfly family Lycaenidae.
- Author
-
Schär S, Eastwood R, Arnaldi KG, Talavera G, Kaliszewska ZA, Boyle JH, Espeland M, Nash DR, Vila R, and Pierce NE
- Subjects
- Animals, Butterflies genetics, Electron Transport Complex IV analysis, Genes, Mitochondrial, Insect Proteins analysis, Phylogeny, Ants physiology, Butterflies physiology, Symbiosis
- Abstract
The role of specialization in diversification can be explored along two geological axes in the butterfly family Lycaenidae. In addition to variation in host-plant specialization normally exhibited by butterflies, the caterpillars of most Lycaenidae have symbioses with ants ranging from no interactions through to obligate and specific associations, increasing niche dimensionality in ant-associated taxa. Based on mitochondrial sequences from 8282 specimens from 967 species and 249 genera, we show that the degree of ecological specialization of lycaenid species is positively correlated with genetic divergence, haplotype diversity and an increase in isolation by distance. Nucleotide substitution rate is higher in carnivorous than phytophagous lycaenids. The effects documented here for both micro- and macroevolutionary processes could result from increased spatial segregation as a consequence of reduced connectivity in specialists, niche-based divergence or a combination of both. They could also provide an explanation for the extraordinary diversity of the Lycaenidae and, more generally, for diversity in groups of organisms with similar multi-dimensional ecological specialization., (© 2018 The Author(s).)
- Published
- 2018
- Full Text
- View/download PDF
99. Reduced entomopathogen abundance in Myrmica ant nests-testing a possible immunological benefit of myrmecophily using Galleria mellonella as a model.
- Author
-
Schär S, Larsen LL, Meyling NV, and Nash DR
- Abstract
Social insects such as ants have evolved collective rather than individual immune defence strategies against diseases and parasites at the level of their societies (colonies), known as social immunity. Ants frequently host other arthropods, so-called myrmecophiles, in their nests. Here, we tested the hypothesis that myrmecophily may partly arise from selection for exploiting the ants' social immunity. We used larvae of the wax moth Galleria mellonella as 'model myrmecophiles' (baits) to test this hypothesis. We found significantly reduced abundance of entomopathogens in ant nests compared with the surrounding environment. Specific entomopathogen groups (Isaria fumosorosea and nematodes) were also found to be significantly less abundant inside than outside ant nests, whereas one entomopathogen (Beauveria brongniartii) was significantly more abundant inside nests. We therefore hypothesize that immunological benefits of entering ant nests may provide us a new explanation of why natural selection acts in favour of such a life-history strategy.
- Published
- 2015
- Full Text
- View/download PDF
100. [Six steps to greater safety].
- Author
-
Schär S, Leu L, and Küng K
- Subjects
- Electronic Prescribing nursing, Humans, Inservice Training organization & administration, Nursing Staff, Hospital education, Quality Improvement organization & administration, Switzerland, Medication Errors nursing, Medication Errors prevention & control, Medication Systems, Hospital organization & administration, Safety Management organization & administration
- Published
- 2015
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.