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  • 1
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    Acyl-ACP Substrate Recognition in Burkholderia mallei BmaI1 Acyl-Homoserine Lactone Synthase (2014)
    American Chemical Society (ACS)
    Details
    Publikationsdatum: 2014-09-26
    Beschreibung: Biochemistry DOI: 10.1021/bi5009529
    Print ISSN: 0006-2960
    Digitale ISSN: 1520-4995
    Thema: Biologie , Chemie und Pharmazie
    Publiziert von American Chemical Society (ACS)
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  • 2
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    Behavioural report of single neuron stimulation in somatosensory cortex (2007)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2007
    Beschreibung: Understanding how neural activity in sensory cortices relates to perception is a central theme of neuroscience. Action potentials of sensory cortical neurons can be strongly correlated to properties of sensory stimuli and reflect the subjective judgements of an individual about stimuli. Microstimulation experiments have established a direct link from sensory activity to behaviour, suggesting that small neuronal populations can influence sensory decisions. However, microstimulation does not allow identification and quantification of the stimulated cellular elements. The sensory impact of individual cortical neurons therefore remains unknown. Here we show that stimulation of single neurons in somatosensory cortex affects behavioural responses in a detection task. We trained rats to respond to microstimulation of barrel cortex at low current intensities. We then initiated short trains of action potentials in single neurons by juxtacellular stimulation. Animals responded significantly more often in single-cell stimulation trials than in catch trials without stimulation. Stimulation effects varied greatly between cells, and on average in 5% of trials a response was induced. Whereas stimulation of putative excitatory neurons led to weak biases towards responding, stimulation of putative inhibitory neurons led to more variable and stronger sensory effects. Reaction times for single-cell stimulation were long and variable. Our results demonstrate that single neuron activity can cause a change in the animal's detection behaviour, suggesting a much sparser cortical code for sensations than previously anticipated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Houweling, Arthur R -- Brecht, Michael -- England -- Nature. 2008 Jan 3;451(7174):65-8. Epub 2007 Dec 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Bernstein Center for Computational Neuroscience and Humboldt University Berlin, Philippstrasse 13, House 6, 10115 Berlin, Germany. arthur.houweling@bccn-berlin.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18094684" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials ; Animals ; Behavior, Animal/*physiology ; Electric Stimulation ; Neurons/*physiology ; Pyramidal Cells/metabolism ; Rats ; Reaction Time ; Somatosensory Cortex/*cytology/*physiology ; Touch/physiology
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Nature Publishing Group (NPG)
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  • 3
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    Neuroscience. Rules of plasticity (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2008-01-05
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brecht, Michael -- Schmitz, Dietmar -- New York, N.Y. -- Science. 2008 Jan 4;319(5859):39-40. doi: 10.1126/science.1153231.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Bernstein Center for Computational Neuroscience, Humboldt-University Berlin, 10115 Berlin, Germany. michael.brecht@bccn-berlin.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18174422" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Association Learning ; Calcium/metabolism ; Long-Term Potentiation ; Memory ; Mice ; *Neuronal Plasticity ; Neurons/physiology ; Receptors, Metabotropic Glutamate/metabolism ; Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors/metabolism ; Signal Transduction ; Somatosensory Cortex/cytology/*physiology ; Synapses/*physiology ; Synaptic Membranes/metabolism ; Vibrissae/innervation/physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 4
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    Synaptic changes in layer 2/3 underlying map plasticity of developing barrel cortex (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2004-05-01
    Beschreibung: The functional and anatomical rearrangements of cortical sensory maps accompanying changes in experience are not well understood. We examined in vivo and in vitro how the sensory map and underlying synaptic connectivity of the developing rat barrel cortex are altered when the sensory input to the cortex is partially deprived. In the nondeprived cortex, both the sensory responses and synaptic connectivity between columns were strengthened through an increase in the synaptic connection probability between L2/3 pyramids in adjacent columns. This was accompanied by a selective growth of L2/3pyramid axonal arbors between spared columns. In contrast, deprived and nondeprived cortical columns became weakly connected in their L2/3 pyramid connections.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Petersen, Carl C H -- Brecht, Michael -- Hahn, Thomas T G -- Sakmann, Bert -- New York, N.Y. -- Science. 2004 Apr 30;304(5671):739-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Physiology, Max-Planck-Institute for Medical Research, Jahnstrasse 29, Heidelberg D-69120, Germany. carl.petersen@epfl.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15118164" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials ; Animals ; Brain Mapping ; Electric Stimulation ; Excitatory Postsynaptic Potentials ; Image Processing, Computer-Assisted ; In Vitro Techniques ; Nerve Net/physiology ; *Neuronal Plasticity ; Patch-Clamp Techniques ; Pyramidal Cells/*physiology/ultrastructure ; Rats ; Rats, Wistar ; Somatosensory Cortex/cytology/growth & development/*physiology ; Synapses/*physiology ; Synaptic Transmission ; Vibrissae/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 5
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    Retraction (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2004-10-02
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Petersen, Carl C H -- Brecht, Michael -- Hahn, Thomas T G -- Sakmann, Bert -- New York, N.Y. -- Science. 2004 Oct 1;306(5693):54.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15459367" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 6
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    Map plasticity in somatosensory cortex (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2005-11-08
    Beschreibung: Sensory maps in neocortex are adaptively altered to reflect recent experience and learning. In somatosensory cortex, distinct patterns of sensory use or disuse elicit multiple, functionally distinct forms of map plasticity. Diverse approaches-genetics, synaptic and in vivo physiology, optical imaging, and ultrastructural analysis-suggest a distributed model in which plasticity occurs at multiple sites in the cortical circuit with multiple cellular/synaptic mechanisms and multiple likely learning rules for plasticity. This view contrasts with the classical model in which the map plasticity reflects a single Hebbian process acting at a small set of cortical synapses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feldman, Daniel E -- Brecht, Michael -- R01 NS046652/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2005 Nov 4;310(5749):810-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biological Sciences, University of California, San Diego, 9500 Gilman Drive, Room 0357, La Jolla, CA 92093, USA. dfeldman@ucsd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16272113" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Axons/physiology ; Brain Mapping ; Dendrites/physiology ; Humans ; Models, Neurological ; Neural Pathways/physiology ; *Neuronal Plasticity ; Neurons/physiology ; Somatosensory Cortex/growth & development/*physiology ; Synapses/*physiology ; Vibrissae/innervation
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 7
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    Impact of spikelets on hippocampal CA1 pyramidal cell activity during spatial exploration (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2010-01-23
    Beschreibung: In vivo intracellular recordings of hippocampal neurons reveal the occurrence of fast events of small amplitude called spikelets or fast prepotentials. Because intracellular recordings have been restricted to anesthetized or head-fixed animals, it is not known how spikelet activity contributes to hippocampal spatial representations. We addressed this question in CA1 pyramidal cells by using in vivo whole-cell recording in freely moving rats. We observed a high incidence of spikelets that occurred either in isolation or in bursts and could drive spiking as fast prepotentials of action potentials. Spikelets strongly contributed to spiking activity, driving approximately 30% of all action potentials. CA1 pyramidal cell firing and spikelet activity were comodulated as a function of the animal's location in the environment. We conclude that spikelets have a major impact on hippocampal activity during spatial exploration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Epsztein, Jerome -- Lee, Albert K -- Chorev, Edith -- Brecht, Michael -- New York, N.Y. -- Science. 2010 Jan 22;327(5964):474-7. doi: 10.1126/science.1182773.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Bernstein Center for Computational Neuroscience, Humboldt University, 10115 Berlin, Germany. epsztein@inmed.univ-mrs.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20093475" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Action Potentials ; Animals ; CA1 Region, Hippocampal/cytology/*physiology ; *Exploratory Behavior ; Male ; Maze Learning ; Patch-Clamp Techniques ; Pyramidal Cells/*physiology ; Rats ; Rats, Wistar ; *Space Perception
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 8
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    Grid-layout and theta-modulation of layer 2 pyramidal neurons in medial entorhinal cortex (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2014-01-25
    Beschreibung: Little is known about how microcircuits are organized in layer 2 of the medial entorhinal cortex. We visualized principal cell microcircuits and determined cellular theta-rhythmicity in freely moving rats. Non-dentate-projecting, calbindin-positive pyramidal cells bundled dendrites together and formed patches arranged in a hexagonal grid aligned to layer 1 axons, parasubiculum, and cholinergic inputs. Calbindin-negative, dentate-gyrus-projecting stellate cells were distributed across layer 2 but avoided centers of calbindin-positive patches. Cholinergic drive sustained theta-rhythmicity, which was twofold stronger in pyramidal than in stellate neurons. Theta-rhythmicity was cell-type-specific but not distributed as expected from cell-intrinsic properties. Layer 2 divides into a weakly theta-locked stellate cell lattice and spatiotemporally highly organized pyramidal grid. It needs to be assessed how these two distinct principal cell networks contribute to grid cell activity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ray, Saikat -- Naumann, Robert -- Burgalossi, Andrea -- Tang, Qiusong -- Schmidt, Helene -- Brecht, Michael -- New York, N.Y. -- Science. 2014 Feb 21;343(6173):891-6. doi: 10.1126/science.1243028. Epub 2014 Jan 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Bernstein Center for Computational Neuroscience, Humboldt University of Berlin, Philippstrasse 13 Haus 6, 10115 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24457213" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Acetylcholine/metabolism ; Animals ; Calbindins/analysis/metabolism ; Dendrites/physiology ; Dentate Gyrus/physiology ; Entorhinal Cortex/*cytology/metabolism/physiology ; Female ; Male ; *Nerve Net ; Pyramidal Cells/metabolism/*physiology/*ultrastructure ; Rats ; Rats, Wistar ; Staining and Labeling ; *Theta Rhythm
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 9
    Digitale Medien
    Digitale Medien
    Cloning and sequencing of glutamate mutase component E from Clostridium tetanomorphum
    Amsterdam : Elsevier
    FEBS Letters 319 (1993), S. 84-89 
    Details
    ISSN: 0014-5793
    Schlagwort(e): Cobalamin-dependent enzyme ; Glutamate mutase ; Vitamin B"1"2
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(93)80042-S
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  • 10
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    Tactile guidance of prey capture in Etruscan shrews (2006)
    National Academy of Sciences
    Details
    Publikationsdatum: 2006-10-23
    Print ISSN: 0027-8424
    Digitale ISSN: 1091-6490
    Thema: Biologie , Medizin , Allgemeine Naturwissenschaft
    Publiziert von National Academy of Sciences
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