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Author Houpt, K.; Marrow, M.; Seeliger, M.
Title A preliminary study of the effect of music on equine behavior Type Journal Article
Year 2000 Publication Journal of Equine Veterinary Science Abbreviated Journal
Volume 20 Issue 11 Pages 691-737
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Call Number (up) refbase @ user @ Serial 1988
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Author Roels, S.; Tilmant, K.; Van Daele, A.; Van Marck, E.; Ducatelle, R.
Title Proliferation, DNA ploidy, p53 overexpression and nuclear DNA fragmentation in six equine melanocytic tumours Type Journal Article
Year 2000 Publication Journal of Veterinary Medicine, Series A Abbreviated Journal
Volume 47 Issue Pages 439-438
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Call Number (up) refbase @ user @ Serial 2016
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Author Pereira, M.E.; Schill, J.L.; Charles, E.P.
Title Reconciliation in captive Guyanese squirrel monkeys (Saimiri sciureus) Type Journal Article
Year 2000 Publication American journal of primatology Abbreviated Journal Am. J. Primatol.
Volume 50 Issue 2 Pages 159-167
Keywords Aggression; Agonistic Behavior; Animals; Conflict (Psychology); Female; Guyana; Male; Saimiri/*psychology; *Social Behavior; Social Dominance
Abstract The tendency for agonistic interaction to increase the probability of friendly interaction between social partners has been demonstrated across a range of Old World primates. While research on such post-conflict behavior proceeds into an hypothesis-testing phase, new comparative information must accumulate to provide full phylogenetic perspective on primate social behavior. Data from New World and prosimian primates are yet extremely limited. We studied captive squirrel monkeys (Saimiri sciureus) via post-conflict (PC) and matched control (MC) observations and analyzed results using both the PC-MC and time-rule methods. Former opponents maintaining affiliative relationships soon engaged in friendly interaction following large proportions of agonistic interactions, whereas non-affiliated individuals, including virtually all male-female pairs, reconciled conflicts rarely. Close-proximity approaching and huddling contact constituted the principal modes of post-conflict amicability. Agonistic interactions of relatively high intensity were most likely to be reconciled and most likely to be reconciled via physical contact. High vulnerability of Saimiri to predation may have favored this species' strong inclination to reconcile soon after agonistic interaction. Research on free-living populations of this and other primate species is needed to illuminate similarities and differences across taxa.
Address Department of Biology and Program in Animal Behavior, Bucknell University, Lewisburg, Pennsylvania 17837, USA. mpereira@bucknell.edu
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ISSN 0275-2565 ISBN Medium
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Notes PMID:10676712 Approved no
Call Number (up) refbase @ user @ Serial 2878
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Author Hohmann, G.; Fruth, B.
Title Use and function of genital contacts among female bonobos Type Journal Article
Year 2000 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.
Volume 60 Issue 1 Pages 107-120
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Abstract Female bonobos, Pan paniscus, show a mounting behaviour that differs physically from that in other primate species. They embrace each other ventroventrally and rub their genital swellings against each other. We investigated five hypotheses on the function of ventroventral mounting (genital contacts) that derive from previous studies of both primate and nonprimate species: (1) reconciliation; (2) mate attraction; (3) tension regulation; (4) expression of social status; and (5) social bonding. We collected data in six field seasons (1993-1998) from members of a habituated, unprovisioned community of wild bonobos at Lomako, Democratic Republic of Congo. No single hypothesis could account for the use of genital contacts, which appeared to be multifunctional. We found support for hypotheses 1 and 3. Rates of postconflict genital contacts exceeded preconflict rates suggesting that the display is used in the context of reconciliation. Rates of genital contacts were high when food could be monopolized and tension was high. However, genital contacts also occurred independently of agonistic encounters. Our study shows rank-related asymmetries in initiation and performance of genital contacts supporting the social status hypothesis: low-ranking females solicited genital contacts more often than high-ranking females while the latter were more often mounter than mountee. Although subordinates took more initiative to achieve genital contact, dominants mostly responded to the solicitation (ventral presentation) with mounting, indicating that the performance benefits both individuals. We suggest that genital contacts can be used to investigate both quality and dynamics of dyadic social relationships among female bonobos. Copyright 2000 The Association for the Study of Animal Behaviour.
Address Max Planck Institute of Evolutionary Anthropology, Leipzig
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ISSN 0003-3472 ISBN Medium
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Notes PMID:10924210 Approved no
Call Number (up) refbase @ user @ Serial 2879
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Author Ronald J. Schusterman; Colleen J. Reichmuth; David Kastak
Title How Animals Classify Friends and Foes Type Journal Article
Year 2000 Publication Current Directions in Psychological Science Abbreviated Journal Curr. Dir. Psychol. Sci.
Volume 9 Issue Pages 1-6
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Call Number (up) refbase @ user @ Serial 3477
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Author Guth S.; Guth W.
Title Morality based on cognition in primates Type Journal Article
Year 2000 Publication Journal of Consciousness Studies Abbreviated Journal
Volume 7 Issue Pages 43-46
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Call Number (up) refbase @ user @ Serial 3478
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Author Mercado E.; Killebrew D.A.; Pack A.A.; Macha I.V.B.; Herman L.M.
Title Generalization of 'same-different' classification abilities in bottlenosed dolphins Type Journal Article
Year 2000 Publication Behavioural Processes Abbreviated Journal Behav. Process.
Volume 50 Issue Pages 79-94
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Call Number (up) refbase @ user @ Serial 3479
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Author Byrne R.W.
Title - Animal Cognition in Nature, edited by Russell P. Balda, Irene M. Pepperberg and Alan C. Kamil Type Journal Article
Year 2000 Publication Trends in Cognitive Sciences Abbreviated Journal Trends. Cognit. Sci.
Volume 4 Issue Pages 73-73
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Call Number (up) refbase @ user @ Serial 3480
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Author Pierce, M.M.; Nall, B.T.
Title Coupled kinetic traps in cytochrome c folding: His-heme misligation and proline isomerization Type Journal Article
Year 2000 Publication Journal of Molecular Biology Abbreviated Journal J Mol Biol
Volume 298 Issue 5 Pages 955-969
Keywords Amino Acid Sequence; Amino Acid Substitution/genetics; Binding Sites; Cytochrome c Group/*chemistry/genetics/*metabolism; *Cytochromes c; Enzyme Stability/drug effects; Fluorescence; Guanidine/pharmacology; Heme/*metabolism; Histidine/genetics/*metabolism; Hydrogen-Ion Concentration; Isomerism; Kinetics; Models, Molecular; Molecular Sequence Data; Mutation/genetics; Proline/*chemistry/metabolism; Protein Conformation/drug effects; Protein Denaturation/drug effects; *Protein Folding; Protein Renaturation; Saccharomyces cerevisiae/enzymology/genetics; Sequence Alignment; Thermodynamics
Abstract The effect of His-heme misligation on folding has been investigated for a triple mutant of yeast iso-2 cytochrome c (N26H,H33N,H39K iso-2). The variant contains a single misligating His residue at position 26, a location at which His residues are found in several cytochrome c homologues, including horse, tuna, and yeast iso-1. The amplitude for fast phase folding exhibits a strong initial pH dependence. For GdnHCl unfolded protein at an initial pH<5, the observed refolding at final pH 6 is dominated by a fast phase (tau(2f)=20 ms, alpha(2f)=90 %) that represents folding in the absence of misligation. For unfolded protein at initial pH 6, folding at final pH 6 occurs in a fast phase of reduced amplitude (alpha(2f) approximately 20 %) but the same rate (tau(2f)=20 ms), and in two slower phases (tau(m)=6-8 seconds, alpha(m) approximately 45 %; and tau(1b)=16-20 seconds, alpha(1b) approximately 35 %). Double jump experiments show that the initial pH dependence of the folding amplitudes results from a slow pH-dependent equilibrium between fast and slow folding species present in the unfolded protein. The slow equilibrium arises from coupling of the His protonation equilibrium to His-heme misligation and proline isomerization. Specifically, Pro25 is predominantly in trans in the unligated low-pH unfolded protein, but is constrained in a non-native cis isomerization state by His26-heme misligation near neutral pH. Refolding from the misligated unfolded form proceeds slowly due to the large energetic barrier required for proline isomerization and displacement of the misligated His26-heme ligand.
Address Center for Biomolecular Structure, Department of Biochemistry, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA
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ISSN 0022-2836 ISBN Medium
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Notes PMID:10801361 Approved no
Call Number (up) refbase @ user @ Serial 3853
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Author Buchner, H.H.F.; Obermuller, S.; Scheidl, M.
Title Body Centre of Mass Movement in the Sound Horse Type Journal Article
Year 2000 Publication The Veterinary Journal Abbreviated Journal
Volume 160 Issue 3 Pages 225-234
Keywords Horse; centre of mass; kinematics; segment model; locomotion.
Abstract The body centre of mass (BCM) is a key factor in the analysis of equine locomotion, as its position and movement determines the distribution and magnitude of loads on the limbs. In this study, the three-dimensional (3D) movement of the BCM in walking and trotting horses was assessed using a kinematic, segmental method. Thirty markers representing 20 body segments were recorded in 12 sound horses while standing, walking and trotting on a treadmill using a high-speed video system. Based on segmental inertial data, 3D positions of the segmental centres of mass as well as the total BCM were calculated. The position within the trunk during square standing and the movements of the BCM were determined for the three planes. The position of the BCM in the standing horse is presented relative to external reference points. At the trot, vertical displacement amplitude of the BCM amounted to 53 (6) mm as mean (sd), which was 27% smaller than external trunk movement. Medio-lateral displacement amplitude of the BCM was 19 (4) mm, 34% less than trunk amplitude. Sagittal forward-backward oscillations of the BCM independent from general forward movement were 13 (3) mm, being 24% less than trunk movements. At the walk, vertical, medio-lateral and sagittal BCM movements were smaller than trunk movements by 43, 65 and 65% respectively. The results show reduced and efficient BCM movements compared to the trunk and form a basis for the assessment of various clinical conditions such as lameness, the influence of a rider and various dressage performances.
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Call Number (up) refbase @ user @ Serial 3959
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