Kooperativer Bibliotheksverbund

Berlin Brandenburg

and
and

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Language
Year
  • 1
    Language: English
    In: Journal of cognitive neuroscience, October 2012, Vol.24(10), pp.2070-9
    Description: Recent brain imaging studies have implicated the rostral ACC (rACC) in the resolution of conflict between competing response tendencies in emotional task contexts, but not in neutral task contexts. This study tested the hypothesis that the rACC is necessary for such context-specific conflict adaptation. To this end, a group of patients with lesions of the rACC, a group of brain-damaged controls, and a group of normal controls classified the emotional expression (emotional task context) or the gender (neutral task context) of faces while ignoring congruent and incongruent words written across the faces. In all three groups, performance was worse with incongruent as compared with congruent stimuli in both task contexts. In the two control groups, this congruency effect was reduced following incongruent trials in both task contexts. By contrast, the rACC group displayed such conflict adaptation only in the neutral, but not in the emotional, task context. These results show that the rACC is necessary for conflict adaptation in emotional but not in neutral task contexts and suggest that the regulation of behavior is context specific.
    Keywords: Conflict (Psychology) ; Adaptation, Psychological -- Physiology ; Emotions -- Physiology ; Gyrus Cinguli -- Physiology ; Photic Stimulation -- Methods ; Psychomotor Performance -- Physiology
    ISSN: 0898929X
    E-ISSN: 1530-8898
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    In: Synlett, 2011, Issue 2, pp.187-190
    Description: Olefination of ester 26 which was obtained from acid 20 and alkenol 25 using a reduced titanium ethylidene reagent led to cyclic enol ether 28 which could be cyclized by iodospiroacetalization to the spiroacetal core of the antifungal compound spirofungin A ( 5 ).
    Keywords: Acetal ; Aldol Reaction ; Natural Product ; Ring-closing Metathesis ; Spirofungin
    ISSN: 0936-5214
    E-ISSN: 1437-2096
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Language: English
    In: European Journal of Organic Chemistry, June, 2014, Vol.2014(16), p.3411(12)
    Description: To purchase or authenticate to the full-text of this article, please visit this link: http://onlinelibrary.wiley.com/doi/10.1002/ejoc.201402029/abstract Byline: Alexander Zhdanko, Martin E. Maier Keywords: Spiro compounds; Enynes; Acetals; Cyclization; Oxygen heterocycles; Homogeneous catalysis Abstract The spirocyclization of different 1,3-enynediols was investigated. The reaction was only efficient for the synthesis of [5,6]-spiroacetals. In this case, the reaction was characterized by almost quantitative yields, short reaction times, and low catalyst loadings (0.5-1%). When the synthesis of [6,6]-spiroacetals was attempted, the reaction suffered from poor regioselectivity and a higher propensity of the intermediate dienol ethers to decompose under the acidic conditions, and it became no longer viable. But it is possible to generate the dienol ethers cleanly under milder conditions as a mixture of regioisomers. This striking difference in reaction efficiency was explained by the unstable dienol ethers cyclizing more quickly to give [5,6]-spiroacetals than to give [6,6]-spiroacetals. In this study, the successful application of a new cationic palladium pincer complex for electrophilic alkyne activation at room temperature has been demonstrated for the first time. Author Affiliation: Institut fur Organische Chemie, Universitat Tubingen, Auf der Morgenstelle 18, 72076 Tubingen, Germany, http://www.uni-tuebingen.de/uni/com/welcome.htm Supporting information: Additional Supporting Information may be found in the online version of this article As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. CAPTION(S): miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information miscellaneous_information
    Keywords: Palladium
    ISSN: 1434-193X
    E-ISSN: 10990690
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Language: English
    In: Brain and Cognition, Nov, 2014, Vol.91, p.1(10)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.bandc.2014.07.008 Byline: Martin Maier, Philipp Glage, Annette Hohlfeld, Rasha Abdel Rahman Abstract: Accumulating evidence suggests that visual perception and, in particular, visual discrimination, can be influenced by verbal category boundaries. One issue that still awaits systematic investigation is the specific influence of semantic contents of verbal categories on categorical perception (CP). We tackled this issue with a learning paradigm in which initially unfamiliar, yet realistic objects were associated with either bare labels lacking explicit semantic content or labels that were accompanied by enriched semantic information about the specific meaning of the label. Two to three days after learning, the EEG was recorded while participants performed a lateralized oddball task. Newly acquired verbal category boundaries modulated low-level aspects of visual perception as early as 100-150ms after stimulus onset, suggesting a genuine influence of language on perception. Importantly, this effect was not further influenced by enriched semantic category information, suggesting that bare labels and the associated minimal and predominantly perceptual information are sufficient for CP. Distinct effects of semantic knowledge independent of category boundaries were found subsequently, starting at about 200ms, possibly reflecting selective attention to semantically meaningful visual features. Article History: Accepted 28 July 2014
    Keywords: Visual Perception ; Enterprise Resource Planning
    ISSN: 0278-2626
    Source: Cengage Learning, Inc.
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Language: English
    In: Brain and Cognition, Nov, 2014, Vol.91, p.1(10)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.bandc.2014.07.008 Byline: Martin Maier, Philipp Glage, Annette Hohlfeld, Rasha Abdel Rahman Abstract: Accumulating evidence suggests that visual perception and, in particular, visual discrimination, can be influenced by verbal category boundaries. One issue that still awaits systematic investigation is the specific influence of semantic contents of verbal categories on categorical perception (CP). We tackled this issue with a learning paradigm in which initially unfamiliar, yet realistic objects were associated with either bare labels lacking explicit semantic content or labels that were accompanied by enriched semantic information about the specific meaning of the label. Two to three days after learning, the EEG was recorded while participants performed a lateralized oddball task. Newly acquired verbal category boundaries modulated low-level aspects of visual perception as early as 100-150ms after stimulus onset, suggesting a genuine influence of language on perception. Importantly, this effect was not further influenced by enriched semantic category information, suggesting that bare labels and the associated minimal and predominantly perceptual information are sufficient for CP. Distinct effects of semantic knowledge independent of category boundaries were found subsequently, starting at about 200ms, possibly reflecting selective attention to semantically meaningful visual features. Article History: Accepted 28 July 2014
    Keywords: Visual Perception ; Enterprise Resource Planning
    ISSN: 0278-2626
    Source: Cengage Learning, Inc.
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Language: English
    In: Behavioural Brain Research, 15 January 2016, Vol.297, pp.259-267
    Description: Violations of outcome expectancies have been proposed to account for error-related brain activity in the medial prefrontal cortex. The present study investigated whether early error monitoring processes are sensitive only to the expectancy of errors, or whether these processes also evaluate the significance of errors. To this end, we considered the error-related negativity (Ne/ERN), an electrophysiological marker of early error monitoring, in a modified flanker task in which errors could occur because participants responded to the flankers instead of the target (flanker error) or because a response unrelated to the stimulus was given (nonflanker error). By manipulating the onset of the flankers relative to the target, we manipulated two variables: the probability (and thus the expectancy) of flanker errors and the proportion of significant attention errors among each error type. Contrary to the predictions of outcome expectancy accounts, we found that the Ne/ERN was larger for flanker errors than for nonflanker errors only in the condition in which flanker errors were particularly frequent. Consistent with the error significance account, however, Ne/ERN amplitude mirrored the estimated proportion of significant attention errors as estimated by multinomial modeling. These results provide support for the idea that early performance monitoring as reflected by the Ne/ERN involves an evaluation of error significance.
    Keywords: Error Monitoring ; Error Expectancy ; Error Significance ; Error-Related Negativity ; Event-Related Potentials ; Flanker Task ; Anatomy & Physiology
    ISSN: 0166-4328
    E-ISSN: 0166-4328
    E-ISSN: 18727549
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Language: English
    In: Tetrahedron, 30 December 2015, Vol.71(52), pp.9662-9666
    Description: Two novel routes to the acylphloroglucinol rhodomyrtone ( ) which has antibiotic properties are presented. In the first route an -quinone methide, generated from dioxaborinine , is reacted with syncarpic acid ( ) leading to xanthenedione . Cleavage of the methyl ether functions led to the known rhodomyrtone precursor . In the second route the bis-ester derivative of trihydroxybenzaldehyde is condensed with syncarpic acid ( ) to give tricyclic hemiacetal . Acetalization and cuprate addition to the enone function led to bis-ester which gave rhodomyrtone ( ) by TiCl -induced regioselective Fries rearrangement.
    Keywords: Acylphloroglucinols ; Ortho-Quinone Methides ; Knoevenagel Condensation ; Fries Rearrangement ; Antibiotics ; Chemistry
    ISSN: 0040-4020
    E-ISSN: 1464-5416
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Language: English
    In: Tetrahedron, 2012, Vol.68(6), pp.1745-1749
    Description: A series of 4-formyl esters – was prepared by Michael addition of an enamine with ethyl acrylate. A subsequent condensation with 2-bromobenzylamines gave rise to cyclic enamides – . In a Heck cyclization reaction tricyclic isoindoles – were formed in good yields.
    Keywords: Heck Cyclization ; Isoindoles ; Enamides ; Heterocycles ; Pyridones ; Chemistry
    ISSN: 0040-4020
    E-ISSN: 1464-5416
    Source: ScienceDirect Journals (Elsevier)
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Language: English
    In: Tetrahedron, Feb 11, 2012, Vol.68(6), p.1745(5)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.tet.2011.12.060 Byline: Gedu Satyanarayana (a), Martin E. Maier (b) Abstract: A series of 4-formyl esters 8a-d was prepared by Michael addition of an enamine with ethyl acrylate. A subsequent condensation with 2-bromobenzylamines 3 gave rise to cyclic enamides 9aa-dd. In a Heck cyclization reaction tricyclic isoindoles 10aa-dd were formed in good yields. Author Affiliation: (a) Department of Chemistry, Indian Institute of Technology (IIT) Hyderabad, Ordnance Factory Estate Campus, Yeddumailaram 502205, Medak District, Andhra Pradesh, India (b) Institut fur Organische Chemie, Universitat Tubingen, Auf der Morgenstelle 18, 72076 Tubingen, Germany Article History: Received 19 October 2011; Revised 14 December 2011; Accepted 20 December 2011
    Keywords: Esters
    ISSN: 0040-4020
    Source: Cengage Learning, Inc.
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Language: English
    In: Tetrahedron, Oct 7, 2013, Vol.69(40), p.8559(5)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.tet.2013.07.091 Byline: Marius Morkunas, Linda Dube, Friedrich Gotz, Martin E. Maier Abstract: In a sequential three-component coupling syncarpic acid, 3-methylbutanal and an acylated phloroglucinol were combined to the hydroxy ketone 3. Acid catalysis converted 3 directly to the natural product rhodomyrtosone B (2). The other isomer, the antibiotic rhodomyrtone (1) was obtained from 3 in a sequence of acid-catalyzed cyclization, retro Friedel-Crafts reaction, and reacylation. In preliminary assays both compounds showed potent antibiotic activity. Author Affiliation: (a) Institut fur Organische Chemie, Universitat Tubingen, Auf der Morgenstelle 18, 72076 Tubingen, Germany (b) Interfakultares Institut fur Mikrobiologie und Infektionsmedizin (IMIT), Mikrobielle Genetik, Universitat Tubingen, Auf der Morgenstelle 28, 72076 Tubingen, Germany Article History: Received 11 July 2013; Revised 22 July 2013; Accepted 29 July 2013
    Keywords: Substitution Reactions
    ISSN: 0040-4020
    Source: Cengage Learning, Inc.
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages