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Triebelhorn J, Schneider J, Spinner CD, Iakoubov R, Voit F, Wagner L, Erber J, Rothe K, Berthele A, Pernpeintner V, Strauß EM, Renders L, Willmann A, Minic M, Vogel E, Christa C, Hoffmann D, Protzer U, Jeske SD. Clinical and immunological outcomes of SARS-CoV-2-infected vaccine responders, vaccine non-responders, and unvaccinated patients evaluated for neutralizing monoclonal antibody treatment at a single German tertiary care center: a retrospective cohort study with prospective follow-up. Infection 2024:10.1007/s15010-023-02171-z. [PMID: 38305828 DOI: 10.1007/s15010-023-02171-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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 12/27/2023] [Indexed: 02/03/2024]
Abstract
PURPOSE This study assessed the clinical and immunological outcomes of SARS-CoV-2-infected patients with risk factors for severe disease depending on their immunological status. METHODS In this retrospective study with single follow-up visit, clinical outcome and humoral immunity was monitored in SARS-CoV-2 infected patients at risk. The results were compared based on the patients' initial immunological status: unvaccinated (UV), patients who did not develop neutralizing antibodies after vaccination (vaccine non-responders, VNR), and patients who expressed neutralizing antibodies after vaccination (vaccine responders, VR). Patients who lacked neutralizing antibodies (VNR and UV) were treated with nMABs. RESULTS In total, 113 patients at risk of severe COVID-19 consented to participate in the study. VR and UV were not admitted to the hospital. During the observation period, UVs had the highest rate of SARS-CoV-2 re-infections. Three of 41 VNRs (7.3%) were hospitalized due to severe COVID-19, with two of them having undergone iatrogenic B-cell depletion. The humoral immune response after infection was significantly lower in the VNR group than in the VR group in terms of anti-N, anti-receptor-binding domain (RBD), anti-S antibody titers, and anti-S antibody avidity. In a sub-analysis of VNR, B cell-deficient non-responders had significantly lower levels of anti-N antibodies and anti-S avidity after infection than other VNRs. CONCLUSION VNR, particularly B-cell-depleted VNR, remained at risk of hospitalization due to COVID-19. In the VR group, however, no clinical complications or severe disease were observed, despite not receiving nMAbs. Tailoring the administration of nMABs according to patient vaccination and immunological status may be advisable.
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Affiliation(s)
- J Triebelhorn
- Department of Internal Medicine II, University Hospital rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany.
| | - J Schneider
- Department of Internal Medicine II, University Hospital rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - C D Spinner
- Department of Internal Medicine II, University Hospital rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - R Iakoubov
- Department of Internal Medicine II, University Hospital rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - F Voit
- Department of Internal Medicine II, University Hospital rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - L Wagner
- Department of Internal Medicine II, University Hospital rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - J Erber
- Department of Internal Medicine II, University Hospital rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - K Rothe
- Institute of Medical Microbiology, Immunology and Hygiene, School of Medicine, Technical University of Munich, Munich, Germany
| | - A Berthele
- Department of Neurology, University Hospital rechts der Isar, Technical University of Munich, Munich, Germany
| | - V Pernpeintner
- Department of Neurology, University Hospital rechts der Isar, Technical University of Munich, Munich, Germany
| | - E-M Strauß
- Department of Neurology, University Hospital rechts der Isar, Technical University of Munich, Munich, Germany
| | - L Renders
- Department of Nephrology, University Hospital rechts der Isar, Technical University of Munich, Munich, Germany
| | - A Willmann
- Institute of Virology, School of Medicine, Technical University of Munich/Helmholtz Centre Munich, Munich, Germany
| | - M Minic
- Institute of Virology, School of Medicine, Technical University of Munich/Helmholtz Centre Munich, Munich, Germany
| | - E Vogel
- Institute of Virology, School of Medicine, Technical University of Munich/Helmholtz Centre Munich, Munich, Germany
| | - C Christa
- Institute of Virology, School of Medicine, Technical University of Munich/Helmholtz Centre Munich, Munich, Germany
| | - D Hoffmann
- Institute of Virology, School of Medicine, Technical University of Munich/Helmholtz Centre Munich, Munich, Germany
| | - U Protzer
- Institute of Virology, School of Medicine, Technical University of Munich/Helmholtz Centre Munich, Munich, Germany
| | - S D Jeske
- Institute of Virology, School of Medicine, Technical University of Munich/Helmholtz Centre Munich, Munich, Germany
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Voit F, Erber J, Feuerherd M, Fries H, Bitterlich N, Diehl-Wiesenecker E, Gladis S, Lieb J, Protzer U, Schneider J, Geisler F, Somasundaram R, Schmid RM, Bauer W, Spinner CD. Rapid point-of-care detection of SARS-CoV-2 infection in exhaled breath using ion mobility spectrometry: a pilot study. Eur J Med Res 2023; 28:318. [PMID: 37660038 PMCID: PMC10474630 DOI: 10.1186/s40001-023-01284-3] [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: 02/24/2023] [Accepted: 08/12/2023] [Indexed: 09/04/2023] Open
Abstract
BACKGROUND An effective testing strategy is essential for pandemic control of the novel Coronavirus disease 2019 (COVID-19) caused by infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Breath gas analysis can expand the available toolbox for diagnostic tests by using a rapid, cost-beneficial, high-throughput point-of-care test. We conducted a bi-center clinical pilot study in Germany to evaluate breath gas analysis using multi-capillary column ion mobility spectrometry (MCC-IMS) to detect SARS-CoV-2 infection. METHODS Between September 23, 2020, and June 11, 2021, breath gas measurements were performed on 380 patients (SARS-CoV-2 real-time polymerase chain reaction (PCR) positive: 186; PCR negative: 194) presenting to the emergency department (ED) with respiratory symptoms. RESULTS Breath gas analysis using MCC-IMS identified 110 peaks; 54 showed statistically significant differences in peak intensity between the SARS-CoV-2 PCR-negative and PCR-positive groups. A decision tree analysis classification resulted in a sensitivity of 83% and specificity of 86%, but limited robustness to dataset changes. Modest values for the sensitivity (74%) and specificity (52%) were obtained using linear discriminant analysis. A systematic search for peaks led to a sensitivity of 77% and specificity of 67%; however, validation by transferability to other data is questionable. CONCLUSIONS Despite identifying several peaks by MCC-IMS with significant differences in peak intensity between PCR-negative and PCR-positive samples, finding a classification system that allows reliable differentiation between the two groups proved to be difficult. However, with some modifications to the setup, breath gas analysis using MCC-IMS may be a useful diagnostic toolbox for SARS-CoV-2 infection. TRIAL REGISTRATION This study was registered at ClinicalTrials.gov on September 21, 2020 (NCT04556318; Study-ID: HC-N-H-2004).
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Affiliation(s)
- Florian Voit
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany.
| | - J Erber
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - M Feuerherd
- Institute of Virology, Helmholtz Center Munich, TUM, School of Medicine, Munich, Germany
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, USA
| | - H Fries
- B. Braun Melsungen AG, Melsungen, Germany
| | - N Bitterlich
- ABX-CRO Advanced Pharmaceutical Services Forschungsgesellschaft mbH, Dresden, Germany
| | - E Diehl-Wiesenecker
- Department of Emergency Medicine, Charité-Universitätsmedizin Berlin, Freie Universität Berlin and Humboldt-Universität Zu Berlin, Berlin, Germany
| | - S Gladis
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - J Lieb
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - U Protzer
- Institute of Virology, Helmholtz Center Munich, TUM, School of Medicine, Munich, Germany
- German Center for Infection Research (DZIF), Munich Partner Site, Munich, Germany
| | - J Schneider
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - F Geisler
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - R Somasundaram
- Department of Emergency Medicine, Charité-Universitätsmedizin Berlin, Freie Universität Berlin and Humboldt-Universität Zu Berlin, Berlin, Germany
| | - R M Schmid
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - W Bauer
- Department of Emergency Medicine, Charité-Universitätsmedizin Berlin, Freie Universität Berlin and Humboldt-Universität Zu Berlin, Berlin, Germany
| | - C D Spinner
- Department of Internal Medicine II, University Hospital Rechts Der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
- German Center for Infection Research (DZIF), Munich Partner Site, Munich, Germany
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Christou-Kent M, Cuartero S, Garcia-Cabau C, Ruehle J, Naderi J, Erber J, Neguembor MV, Plana-Carmona M, Alcoverro-Bertran M, De Andres-Aguayo L, Klonizakis A, Julià-Vilella E, Lynch C, Serrano M, Hnisz D, Salvatella X, Graf T, Stik G. CEBPA phase separation links transcriptional activity and 3D chromatin hubs. Cell Rep 2023; 42:112897. [PMID: 37516962 DOI: 10.1016/j.celrep.2023.112897] [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: 06/28/2022] [Revised: 06/02/2023] [Accepted: 07/14/2023] [Indexed: 08/01/2023] Open
Abstract
Cell identity is orchestrated through an interplay between transcription factor (TF) action and genome architecture. The mechanisms used by TFs to shape three-dimensional (3D) genome organization remain incompletely understood. Here we present evidence that the lineage-instructive TF CEBPA drives extensive chromatin compartment switching and promotes the formation of long-range chromatin hubs during induced B cell-to-macrophage transdifferentiation. Mechanistically, we find that the intrinsically disordered region (IDR) of CEBPA undergoes in vitro phase separation (PS) dependent on aromatic residues. Both overexpressing B cells and native CEBPA-expressing cell types such as primary granulocyte-macrophage progenitors, liver cells, and trophectoderm cells reveal nuclear CEBPA foci and long-range 3D chromatin hubs at CEBPA-bound regions. In short, we show that CEBPA can undergo PS through its IDR, which may underlie in vivo foci formation and suggest a potential role of PS in regulating CEBPA function.
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Affiliation(s)
- Marie Christou-Kent
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Sergi Cuartero
- Josep Carreras Leukaemia Research Institute (IJC), Badalona, Spain; Germans Trias I Pujol Research Institute (IGTP), Badalona, Spain
| | - Carla Garcia-Cabau
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Julia Ruehle
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Julian Naderi
- Department of Genome Regulation, Max Planck Institute for Molecular Genetics, Ihnestrasse 63-73, 14195 Berlin, Germany
| | - Julia Erber
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Maria Victoria Neguembor
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Marcos Plana-Carmona
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | | | - Luisa De Andres-Aguayo
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Antonios Klonizakis
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | | | - Cian Lynch
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain; Altos Labs, Cambridge Institute of Science, Cambridge CB21 6GP, UK
| | - Manuel Serrano
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain; Altos Labs, Cambridge Institute of Science, Cambridge CB21 6GP, UK
| | - Denes Hnisz
- Department of Genome Regulation, Max Planck Institute for Molecular Genetics, Ihnestrasse 63-73, 14195 Berlin, Germany
| | - Xavier Salvatella
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain; ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | - Thomas Graf
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra (UPF), Barcelona, Spain.
| | - Grégoire Stik
- Josep Carreras Leukaemia Research Institute (IJC), Badalona, Spain.
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Erber J, Herndler-Brandstetter D. Regulation of T cell differentiation and function by long noncoding RNAs in homeostasis and cancer. Front Immunol 2023; 14:1181499. [PMID: 37346034 PMCID: PMC10281531 DOI: 10.3389/fimmu.2023.1181499] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 05/02/2023] [Indexed: 06/23/2023] Open
Abstract
Long noncoding RNAs (lncRNAs) increase in genomes of complex organisms and represent the largest group of RNA genes transcribed in mammalian cells. Previously considered only transcriptional noise, lncRNAs comprise a heterogeneous class of transcripts that are emerging as critical regulators of T cell-mediated immunity. Here we summarize the lncRNA expression landscape of different T cell subsets and highlight recent advances in the role of lncRNAs in regulating T cell differentiation, function and exhaustion during homeostasis and cancer. We discuss the different molecular mechanisms of lncRNAs and highlight lncRNAs that can serve as novel targets to modulate T cell function or to improve the response to cancer immunotherapies by modulating the immunosuppressive tumor microenvironment.
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Pietrowski D, Mladek R, Frank M, Erber J, Marschalek J, Schneeberger C. Analyses of human granulosa cell vitality by fluorescence activated cell sorting after rapid cooling. HUM FERTIL 2020; 25:478-486. [PMID: 32914641 DOI: 10.1080/14647273.2020.1817578] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
In reproductive medicine, the technique of rapid cooling becomes increasingly important for the preservation of tissue and cells. In order to protect the cells, incubation in different cryopreservation solutions is essential. The speed of the cooling process also makes a pivotal contribution to the success of this method. Using Flourescence Activated Cell Sorting (FACS), we investigated the impact of an open rapid and a closed rapid cooling technique on the vitality of human granulosa cells. Furthermore, we examined effects of the different solutions used for rapid cooling and warming before and after rapid cooling. We found a significant lower proportion of vital cells after rapid cooling compared to untreated controls independently of the technique and the tube size. However, we did not find any significant differences between open and closed rapid cooling. In both, a lower proportion of vital granulosa cells were found after incubation in rapid cooling solution only compared to warming solution only. Our results lend support to the conclusion that the difference of cooling-speed between open and closed rapid cooling is, in our settings, not crucial for the success of the procedure and that cryoprotective agents in the rapid cooling solutions have a higher potential to cause severe cell damage than agents used for warming.
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Affiliation(s)
- Detlef Pietrowski
- Department of Obstetrics and Gynecology, Medical University Vienna, Vienna, Austria
| | - Raphaela Mladek
- FH Campus Wien, University of Applied Science, Vienna, Austria
| | - Maria Frank
- Department of Obstetrics and Gynecology, Medical University Vienna, Vienna, Austria
| | - Julia Erber
- Faculty of Life Science, University of Vienna, Vienna, Austria
| | - Julian Marschalek
- Department of Obstetrics and Gynecology, Medical University Vienna, Vienna, Austria
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Erber J, Hoormann J, Scheiner R. Phototactic behaviour correlates with gustatory responsiveness in honey bees (Apis mellifera L.). Behav Brain Res 2006; 174:174-80. [PMID: 16934881 DOI: 10.1016/j.bbr.2006.07.023] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Revised: 07/21/2006] [Accepted: 07/24/2006] [Indexed: 10/24/2022]
Abstract
The response threshold hypothesis of division of labour in honey bees assumes that individuals differ in their responsiveness to different stimulus modalities. However, previous experiments have shown that responsiveness to gustatory stimuli correlates with responsiveness to odours, pollen and tactile stimuli. Evaluation of these stimuli involves sensory receptors on the antenna. We tested whether responsiveness to gustatory stimuli correlates with responsiveness to visual stimuli in a phototaxis experiment, which is independent of antennal input. Gustatory responsiveness was measured using the proboscis extension response to antennal stimulation with water and different sucrose concentrations. Phototaxis was quantified by measuring the walking times a bee needed to reach light sources of different intensities. Walking behaviour in the darkness was measured to test for differences in locomotor behaviour. The walking time towards a light stimulus, the path length, and the walking speed depended on the intensity of the light stimulus. Responsiveness to visual stimuli correlated significantly with gustatory responsiveness. Bees displaying a high gustatory responsiveness were also very sensitive to light. Locomotor activity did not correlate with gustatory responsiveness. This shows that gustatory responsiveness is a good indicator of sensitivity for visual stimuli, which are not perceived by the antenna.
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Affiliation(s)
- J Erber
- Institut für Okologie, Technische Universität Berlin, Franklinstr. 28/29, FR 1-1, D-10587 Berlin, Germany
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Scheiner R, Müller U, Heimburger S, Erber J. Activity of protein kinase A and gustatory responsiveness in the honey bee ( Apis mellifera L.). J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2003; 189:427-34. [PMID: 12715200 DOI: 10.1007/s00359-003-0419-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2002] [Revised: 02/04/2003] [Accepted: 03/28/2003] [Indexed: 11/28/2022]
Abstract
The cAMP-dependent protein kinase A is involved in the induction of long-term memory and habituation in the bee. Gustatory responsiveness correlates strongly with associative and non-associative learning in bees. We tested whether protein kinase A activity in the antennal lobes correlates with gustatory responsiveness. Thirty minutes after feeding, bees with high gustatory responsiveness had a significantly higher protein kinase A activity than bees with low responsiveness. Ninety minutues after feeding, when gustatory responsiveness had increased in initially unresponsive bees, no changes in protein kinase A activity were found. We also tested time-dependent effects of protein kinase A activator and protein kinase A inhibitor on gustatory responsiveness. Injection of the protein kinase A activator adenosine 3'5'-cyclic monophosphate 8-bromo-sodium salt or of the protein kinase A inhibitor KT 5720 did not affect gustatory responsiveness within the first 4 h after treatment. Feeding of adenosine 3'5'-cyclic monophosphate 8-bromo-sodium salt over 4 days increased gustatory responsiveness in newly emerged bees and adult foragers. These results enable us to distinguish between two different forms of gustatory responsiveness: basal and transient gustatory responsiveness. Basal gustatory responsiveness correlates with protein kinase A activity and can only be modulated in the range of several days. Transient gustatory responsiveness appears to be independent of protein kinase A activity and can be modulated in the range of minutes to hours.
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Affiliation(s)
- R Scheiner
- Institut für Okologie, Technische Universität Berlin, Franklinstr. 28/29, 10587, Berlin, Germany.
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Scheiner R, Page RE, Erber J. The effects of genotype, foraging role, and sucrose responsiveness on the tactile learning performance of honey bees (Apis mellifera L.). Neurobiol Learn Mem 2001; 76:138-50. [PMID: 11502146 DOI: 10.1006/nlme.2000.3996] [Citation(s) in RCA: 127] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We analyzed sucrose responsiveness and associative tactile learning in two genetic strains of honey bees under laboratory conditions. These strains differ in their foraging behavior. Bees of the "high" strain preferentially collect pollen. "Low"-strain bees mainly forage for nectar. Responsiveness to different sucrose concentrations and tactile learning were examined using the proboscis extension reflex. Acquisition, extinction of conditioned responses, and responses to an alternative tactile stimulus were tested. High-strain bees are more responsive to sucrose than low-strain bees. Regardless of genotype, pollen foragers are more responsive to sucrose than nectar foragers. In bees of both strains we find the same relationship between responsiveness to sucrose and acquisition. Bees responding to low sucrose concentrations show more often the conditioned response during acquisition than those responding only to higher sucrose concentrations. Extinction of conditioned responses depends on the response probability during acquisition. Discrimination between the two tactile stimuli is affected by genotype but not by responsiveness to sucrose. High-strain bees discriminate better than low-strain bees. Our experiments thus establish links between division of labor, responsiveness to sucrose, and associative learning in honey bees.
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Affiliation(s)
- R Scheiner
- Institut für Okologie und Biologie, Technische Universität Berlin, Franklinstrasse 28/29, Berlin, D-10587, Germany.
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Abstract
Using sucrose solution as reward, we conditioned preforaging honey bees of two genetic strains to tactile stimuli or to odours. Acquisition, extinction of conditioned responses and discrimination between the conditioned stimuli and alternative tactile or olfactory stimuli were measured. Bees of the two genetic strains were selected for their foraging behaviour. In addition, they differ in their responsiveness to sucrose. To analyse the effects of sucrose perception on learning parameters independent of foraging behaviour, we conditioned preforaging bees of the two strains and compared their performance in tactile and olfactory learning paradigms. In both strains, acquisition in tactile and olfactory conditioning is determined by responsiveness to sucrose. There is no genetic effect on the relationship between responsiveness to sucrose and acquisition. Bees responding to low sucrose concentrations perform better than ones that only respond to higher concentrations. Extinction of conditioned responses correlates with acquisition. Responses to alternative stimuli are independent of responsiveness to sucrose.
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Affiliation(s)
- R Scheiner
- Institut für Okologie und Biologie, Technische Universität Berlin, Franklinstr. 28/29, D-10587, Berlin, Germany.
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Erber J, Pribbenow B, Kisch J, Faensen D. Operant conditioning of antennal muscle activity in the honey bee (Apis mellifera L.). J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2000; 186:557-65. [PMID: 10947238 DOI: 10.1007/s003590000111] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Antennal movements of the honey bee can be conditioned operantly under laboratory conditions. Using this behavioural paradigm we have developed a preparation in which the activity of a single antennal muscle has been operantly conditioned. This muscle, the fast flagellum flexor muscle, is innervated by an identified motoneuron whose action potentials correlate 1:1 with the muscle potentials. The activity of the fast flagellum flexor muscle was recorded extracellularly from the scapus of the antenna. The animal was rewarded with a drop of sucrose solution whenever the muscle activity exceeded a defined reward threshold. The reward threshold was one standard deviation above the mean spontaneous frequency prior to conditioning. After ten conditioning trials, the frequency of the muscle potentials had increased significantly compared to the spontaneous frequency. The conditioned changes of frequency were observed for 30 min after conditioning. No significant changes of the frequency were found in the yoke control group. The firing pattern of the muscle potentials did not change significantly after conditioning or feeding. Fixing the antennal joints reduces or abolishes associative operant conditioning. The conditioned changes of the frequency of muscle potentials in the freely moving antenna are directly comparable to the behavioural changes during operant conditioning.
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Affiliation(s)
- J Erber
- Institut für Okologie und Biologie, Technische Universität Berlin, Germany
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Scheiner R, Erber J, Page RE. Tactile learning and the individual evaluation of the reward in honey bees (Apis mellifera L.). J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1999; 185:1-10. [PMID: 10450609 DOI: 10.1007/s003590050360] [Citation(s) in RCA: 137] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using the proboscis extension response we conditioned pollen and nectar foragers of the honey bee (Apis mellifera L.) to tactile patterns under laboratory conditions. Pollen foragers demonstrated better acquisition, extinction, and reversal learning than nectar foragers. We tested whether the known differences in response thresholds to sucrose between pollen and nectar foragers could explain the observed differences in learning and found that nectar foragers with low response thresholds performed better during acquisition and extinction than ones with higher thresholds. Conditioning pollen and nectar foragers with similar response thresholds did not yield differences in their learning performance. These results suggest that differences in the learning performance of pollen and nectar foragers are a consequence of differences in their perception of sucrose. Furthermore, we analysed the effect which the perception of sucrose reward has on associative learning. Nectar foragers with uniform low response thresholds were conditioned using varying concentrations of sucrose. We found significant positive correlations between the concentrations of the sucrose rewards and the performance during acquisition and extinction. The results are summarised in a model which describes the relationships between learning performance, response threshold to sucrose, concentration of sucrose and the number of rewards.
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Affiliation(s)
- R Scheiner
- Institut für Okologie und Biologie, Technische Universität Berlin, Germany.
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Abstract
An operant learning protocol was developed for honeybees that are fixed in small tubes. The bees had to touch one or two small silver plates within the range of one antenna. The contacts of the antenna with the silver plates were registered electronically. Three conditioning protocols were analysed. In the first series the conditioned increase of the contact frequency was tested. The animals could touch one plate and received a reward (a small drop of sucrose) whenever the instantaneous frequency at this plate was more than one or two standard deviations above the spontaneous frequency. After conditioning the bees showed a significant increase of the contact frequency. No significant changes were found in a group of yoked controls. In the second series differential conditioning was tested. The animals could touch two silver plates. The spontaneous behaviour was measured and the animals received the reward upon touching the plate with the lower spontaneous frequency. The rewards were only applied whenever the instantaneous frequency exceeded a defined threshold. After ten conditioning trials the animals showed a significant increase in contact frequency for the conditioned plate compared to spontaneous behaviour. No significant changes were found in a group of yoked controls. In the third series reversal learning was tested. The animals were able to touch two silver plates. They were first conditioned to touch the plate which had the lower spontaneous contact frequency. After these conditioning trials they were tested for 10 min and subsequently conditioned to the alternative plate. The experiments demonstrated significant reversal learning compared to yoked controls. This new operant conditioning paradigm for the bee offers the possibility to analyse at the physiological level the mechanisms underlying different forms of learning in this insect.
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Affiliation(s)
- J Kisch
- Institut für Okologie und Biologie, Technische Universität Berlin, Germany.
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Blenau W, Erber J. Behavioural pharmacology of dopamine, serotonin and putative aminergic ligands in the mushroom bodies of the honeybee (Apis mellifera). Behav Brain Res 1998; 96:115-24. [PMID: 9821548 DOI: 10.1016/s0166-4328(97)00201-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The proboscis extension response (PER) which can be elicited in bees by stimulating one antenna with water vapour, was used to quantify the effects of dopamine, serotonin (5-HT) and putative receptor ligands in the mushroom body of the bee. The drugs were microinjected into the alpha-lobe of the mushroom body in one brain hemisphere. Injection of dopamine reduces the water vapour-elicited PER significantly. The effects of dopamine are limited to the treated side. Injection of 5-HT has similar effects to dopamine. The effects of 5-HT are apparent on the treated and partly also on the contralateral side. Significant effects for dopamine on the treated side were found when the concentration in the injected drop was 10(-7) M. For 5-HT significant effects on the treated side were apparent for concentrations of 10(-8) M. Putative dopamine and 5-HT receptor ligands were injected alone and coinjected with the amines. Two ligands with dopamine-antagonistic effects were found: buspirone > spiperone, while lisuride, sulpiride, chlorpromazine, SCH 23390, butaclamol and haloperidol had no dopamine-antagonistic effects. All tested putative 5-HT receptor ligands had significant 5-HT-antagonistic effects: butaclamol > methysergide > lisuride > cyproheptadine > SCH 23390. Good correlations between the behavioural data and in vitro radioligand binding studies were found for 5-HT receptor ligands, while there exist only partial correlations for dopamine receptor ligands.
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Affiliation(s)
- W Blenau
- Institut für Okologie und Biologie, Technische Universität Berlin, Germany.
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Page RE, Erber J, Fondrk MK. The effect of genotype on response thresholds to sucrose and foraging behavior of honey bees (Apis mellifera L.). J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1998; 182:489-500. [PMID: 9565478 DOI: 10.1007/s003590050196] [Citation(s) in RCA: 196] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Honey bee foragers were tested for their proboscis extension response (PER) to water and varying solutions of sucrose. Returning pollen and nectar foragers were collected at the entrance of a colony and were assayed in the laboratory. Pollen foragers had a significantly higher probability of responding to water and to lower concentrations of sucrose. Bees derived from artificially selected high- and low-pollen-hoarding strains were also tested using the proboscis extension assay. Returning foragers were captured and tested for PERs0 to 30% sucrose. Results demonstrated a genotypic effect on PERs of returnining foragers. The PERs of departing high- and low-strain foragers were consistent with those of returning foragers. The PERs were related to nectar and water reward perception of foragers. High strain bees were more likely to return with loads of water and lower concentrations of sucrose than foragers from low pollen strain. Low-strain bees were more likely to return empty. We identified a previously mapped genomic region that contains a variable quantitative trait locus that appears to influence sucrose response thresholds. These studies demonstrate a gene-brain-behavior pathway that can be altered as a consequence of colony-level selection for quantities of stored food.
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Affiliation(s)
- R E Page
- Department of Entomology, University of California, Davis.95616. USA
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Blenau W, Erber J, Baumann A. Characterization of a dopamine D1 receptor from Apis mellifera: cloning, functional expression, pharmacology, and mRNA localization in the brain. J Neurochem 1998; 70:15-23. [PMID: 9422342 DOI: 10.1046/j.1471-4159.1998.70010015.x] [Citation(s) in RCA: 124] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The neurotransmitter dopamine is an important regulator of physiological and behavioral functions in both vertebrates and invertebrates. We have isolated a homologue of the vertebrate dopamine D1 receptor subfamily from the honeybee Apis mellifera. [3H]Lysergic acid diethylamide specifically binds to the heterologously expressed receptor with K(D) approximately 5 nM. Dopaminergic receptor ligands compete for this high-affinity binding, with the following order of potency: R(+)-lisuride > chlorpromazine = cis(Z)-flupentixol > dopamine > S(+)-butaclamol > R(+)-SCH 23390 > haloperidol. Activation of the heterologously expressed receptor of Apis mellifera leads to cyclic AMP production. Receptor mRNA is expressed in perikarya of different brain neuropils, including those of mushroom body intrinsic neurons. These results suggest that this dopamine receptor is involved in signal processing of visual and olfactory information in the honeybee.
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Affiliation(s)
- W Blenau
- Institut für Okologie und Biologie, Technische Universität Berlin, Germany
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Pribbenow B, Erber J. Modulation of antennal scanning in the honeybee by sucrose stimuli, serotonin, and octopamine: behavior and electrophysiology. Neurobiol Learn Mem 1996; 66:109-20. [PMID: 8946404 DOI: 10.1006/nlme.1996.0052] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Antennal motor activity of the honeybee was used to test the effects of sucrose stimuli and of serotonin and octopamine microinjections into the brain. The antennal scanning behavior was analyzed in behavioral experiments. Activity of an antennal muscle, the "fast pedicellus flexor muscle" which dominates scanning behavior, was used as a physiological measure of modulatory effects. A single sucrose stimulus applied to both the antenna and the proboscis leads to significant increases of the frequency of antennal scanning compared to those of untreated controls and animals stimulated with water. A single sucrose stimulus applied only to the antenna or the proboscis has no significant behavioral effects. Injection of small volumes (approximately 500 pl) of serotonin (5HT) or octopamine (OA) at concentrations of 10(-5) M into the dorsal lobe, the sensory motor center of the antenna, leads to functionally antagonistic behavioral effects. While 5HT injection significantly reduces the antennal scanning frequency, OA significantly enhances it. The degree of behavioral modulation is significantly correlated with the activity of the animals. In animals which display low scanning activity, OA injection has an enhancing effect, while 5HT has no effect. In contrast, 5HT injection, but not OA injection, produces a behavioral effect in animals with high scanning activity. Behavioral changes and changes of activity of the fast pedicellus flexor muscle are closely correlated. Significant, functionally antagonistic effects of 5HT and OA on muscle activity were found after injections of the compounds into the dorsal lobe. 5HT leads to a reduction of the muscle potential frequency starting immediately after injection and lasting at least 15 min. OA injection results in an increase of frequency, which has its maximum 5 min after injection. The experiments demonstrate that sucrose, the reward stimulus during associative learning in the bee, also modulates motor activity under nonassociative conditions. The similar effects of sucrose stimulation and OA injection are consistent with the hypothesis that OA mediates the effects of sucrose stimuli.
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Affiliation(s)
- B Pribbenow
- Institut für Biologie, Technische Universität Berlin, Germany
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Abstract
Binding sites for the nicotinic acetylcholine receptor antagonist, [125I]alpha-bungarotoxin, were localized in the honeybee brain by in vitro autoradiography. Highest binding site densities were localized in the suboesophageal ganglion, the optic tubercles, optic lobes medulla and lobula, antennal lobes, dorsal lobes and the alpha-lobes of the mushroom bodies. The distribution pattern of these putative nicotinic acetylcholine receptors suggests that acetylcholine is involved in several sensory pathways and in central information processing in the honeybee brain.
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Affiliation(s)
- A Scheidler
- Department of Biology, Technical University of Berlin, F.R.G
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Abstract
Peptide-FMRFamide-like immunoreactivity in the brain and suboesophageal ganglion of the honeybee Apis mellifera L. is demonstrated with the peroxidase-antiperoxidase technique. Immunoreactivity is found in about 120 perikarya of the brain and in about 30 of the suboesophageal ganglion. These cells are distributed in 13 paired clusters representing neurons of different types including neurosecretory neurons projecting to neurohemal organs. Immunoreactivity of different intensity is found in the non-glomerular neuropil around the mushroom bodies, in the lateral protocerebrum, the central body, the optic tubercles, the lobula and medulla of optic lobe, the ocellar neuropil, in multiglomerular elements of the antennal lobes and in the dorsal deuterocerebrum. In the mushroom bodies, immunoreactivity is located in layers of the lobes and stalks, corresponding to intrinsic fibre bundles of some Kenyon cell types. The somata of these intrinsic cells did not show FMRFamide-like immunoreactivity. Electron microscopy of immunostained somata and nerve fibres was performed employing a pre-embedding peroxidase-antiperoxidase technique. Fibres of optic lobes and the non-glomerular neuropil contain immunoreactive dense core vesicles (diameter 50-165 nm) accumulated in boutons besides small synaptic vesicles and synaptic membrane specializations. Immunoreactive layers of the mushroom body neuropil were analysed at the ultrastructural level. Axon profiles with dense-core vesicles of a small type (diameter 35-75 nm) show only faint immunoreactive products. Immunoreactivity of intrinsic mushroom body neurons does not appear to be specifically correlated with synaptic organelles. Our results indicate that FMRFamide or related peptides peptides may be neuroactive compounds in different classes of nerve cells in the bee brain.
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Affiliation(s)
- F W Schürmann
- I. Zoologisches Institut der Universität, Göttingen, F.R.G
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Abstract
A standard optokinetic response of the ipsilateral and contralateral (driven) eyes of the crab Leptograpsus variegatus to a sinusoidally oscillating striped drum was established. Optokinetic responses were then measured of animals that had been treated by introducing serotonin and octopamine into the blood stream via the heart and also into the neural tissue of the optic lobes via a micropipette. Both serotonin and octopamine enhance the optokinetic effect when applied in low doses. Experiments show that serotonin is most likely acting closer to the sensory input in the optokinetic system.
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Affiliation(s)
- J Erber
- School of Biological Science, University of New South Wales, Kensington, Australia
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Kaulen P, Erber J, Mobbs P. Current source-density analysis in the mushroom bodies of the honeybee (Apis mellifera carnica). J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1984. [DOI: 10.1007/bf00610170] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
It has been proposed that the old do not process information as deeply as the young and therefore show poorer memory. This study manipulated level of processing via type of instruction given to subjects prior to the memory tasks (recall followed by recognition). Five types of instructions were employed: non-semantic, non-semantic + intentional, intentional, semantic, and semantic + intentional. Type of instruction affected the two age groups differentially on recall memory but not on recognition memory. The young and old recalled at the same level following a non-semantic (shallow) instruction, but parted ways thereafter; the young became disproportionately superior with semantic instructions. The addition of an intentional component to the non-semantic instruction benefited the recalll performance of the young to a greater extent than the old. The addition of an intentional component to a semantic component benefited the recal performance of the young, but not the old. It was concluded that the old have more difficulty than the young in dealing with two instructional components simultaneously when recall performance is under consideration.
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Abstract
It was hypothesized that older adults do not perform well in laboratory learning tasks, not so much because they do not learn well as because they are reluctant to demonstrate what they have learned by venturing responses when uncertain. This hypothesis was tested by contrasting the performance of older subjects who were rewarded for responding, right or wrong (experimental group) with subjects who were rewarded for only correct responses (control group). Older subjects from a wide range of SES levels learned most efficiently under the control condition. However, for older subjects from high SES vs low SES levels, differential results were obtained. The high SES subjects learned more efficiently under the control condition, whereas there was a trend for the low SES subjects to learn more efficiently under the experimental condition. The hypothesis therefore received at least partial support in this study.
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Menzel R, Erber J, Greggers U. On-line computation of photoreceptor spectral sensitivity--a low-cost solution with a programmable pocket calculator. Vision Res 1978; 18:879-82. [PMID: 676099 DOI: 10.1016/0042-6989(78)90134-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Erber J, Sandeman DC. The detection of real and apparent motion by the crabLeptograpsus variegatus. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1976. [DOI: 10.1007/bf00606538] [Citation(s) in RCA: 9] [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: 10/26/2022]
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Abstract
After a single reward on a spectral color, freely flying honeybees show retrograde amnesia when an electroconvulsive shock, CO2 narcosis, N2 narcosis, or cooling (to 1 degrees C) is applied after learning. Retrograde amnesia is measurable with these four treatments up to 7 min after the reward. For none of the treatments was a consistent relationship found between the reaction tested and the time of testing after the treatment. Prolonged application of the four treatments leads to a significant increase in the rate of retrograde amnesia only after CO2 narcosis. Memory in the honeybee is susceptible to impairment until 15 min after the reward.
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Sandeman DC, Erber J. The detection of real and apparent motion by the crabLeptograpsus variegatus. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1976. [DOI: 10.1007/bf00606537] [Citation(s) in RCA: 9] [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: 11/28/2022]
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Sandeman DC, Kien J, Erber J. Optokinetic eye movements in the crab,Carcinus maenas. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1975. [DOI: 10.1007/bf00657186] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Sandeman DC, Erber J, Kien J. Optokinetic eye movements in the crab,Carcinus maenas. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1975. [DOI: 10.1007/bf00657185] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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