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| Author |
Yulk G. |
Title  |
Leadership in organizations. |
Type |
Book Whole |
| Year |
1998 |
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| Abstract |
Yulk G. 1998. Leadership in organizations. Englewood Cliffs, NJ: Prentice-Hall
Leadership in Organizations focuses on effective leadership in organizations through both theory and practice. This book explains and critiques the major theories and studies that are most relevant and informative and reviews what we know about leadership effectiveness. This combination of theory and practice makes this text a useful resource for practicing managers who are looking for something more than superficial answers to difficult questions about leadership. |
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Prentice-Hall |
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Englewood Cliffs, NJ |
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978-0138142681 |
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Equine Behaviour @ team @ |
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4806 |
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| Author |
Byrne, R. W.; Russon, A. E. |
| Title |
Learning by imitation: a hierachical approach |
Type |
Journal Article |
| Year |
1998 |
Publication |
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Abbreviated Journal |
Behav. Brain Sci. |
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21 |
Issue |
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Pages |
667-721 |
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Equine Behaviour @ team @ |
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5598 |
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| Author |
Templeton, J.J. |
| Title |
Learning from others' mistakes: a paradox revisited |
Type |
Journal Article |
| Year |
1998 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
55 |
Issue |
1 |
Pages |
79-85 |
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| Abstract |
Some researchers have reported the paradoxical finding of enhanced social learning when naive observers learn from unskilled rather than skilled demonstrators, particularly in discrimination tasks. In two experiments with starlings,Sturnus vulgaris, I considered whether this enhanced learning is because the observer (1) sees incorrect responses only, (2) sees both correct and incorrect responses or (3) sees an increase in the proportion of correct responses over trials. In experiment 1, individual starlings observed a demonstrator bird perform multiple simultaneous discrimination tasks. In one group, the demonstrator always picked the correct stimulus; in another group, the demonstrator always picked the incorrect stimulus; in a third group, the demonstrator consistently picked the correct stimulus 50% of the time. Those subjects that observed only incorrect choices performed significantly better than the other two groups, but none of the birds achieved the 90% correct performance criterion. Experiment 2 involved a single discrimination task; thus, a fourth group was added to control for individual learning. Again, subjects that observed only incorrect responses learned the discrimination significantly more quickly than the other three groups. Subjects that observed the demonstrator make both correct and incorrect responses were equally likely to select the same (correct) or opposite (incorrect) stimulus when the demonstrator picked the correct stimulus. When the demonstrator picked the incorrect stimulus, however, these subjects were significantly more likely to pick the opposite (correct) stimulus. These findings suggest that when learning a discrimination problem, observing a foraging companion's lack of success is more informative than observing its success. |
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refbase @ user @ |
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567 |
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Schiffman, S.S. |
| Title |
Livestock odors: implications for human health and well-being |
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Journal Article |
| Year |
1998 |
Publication |
Journal of Animal Science |
Abbreviated Journal |
J. Anim Sci. |
| Volume |
76 |
Issue |
5 |
Pages |
1343-1355 |
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N1 - |
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Equine Behaviour @ team @ |
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2949 |
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| Author |
Birch, H.L.; Bailey, A.J.; Goodship, A.E. |
| Title |
Macroscopic 'degeneration' of equine superficial digital flexor tendon is accompanied by a change in extracellular matrix composition |
Type |
Journal Article |
| Year |
1998 |
Publication |
Equine Veterinary Journal |
Abbreviated Journal |
Equine Vet J |
| Volume |
30 |
Issue |
6 |
Pages |
534-539 |
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Animals; Collagen/analysis; DNA/analysis; Extracellular Matrix/*chemistry; Glycosaminoglycans/analysis; Horses/injuries/*physiology; Immunohistochemistry; Rupture/veterinary; Tendon Injuries/metabolism/pathology/veterinary; Tendons/chemistry/*pathology; Water/analysis |
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Injuries to the superficial digital flexor tendon are common in horses required to gallop and jump at speed. Partial rupture of this tendon usually occurs in the central core of the midmetacarpal region and may be preceded by localised degenerative changes. Post mortem examination of apparently normal equine flexor tendons has revealed an abnormal macroscopic appearance in the central core, characterised by a reddish discolouration. We have previously shown that there is also physical damage to the collagen fibres. In the present study we tested the hypothesis that the abnormal appearance is accompanied by changes in the composition of the extracellular matrix of the tendon. Biochemical analysis of the extracellular matrix demonstrated an increase in total sulphated glycosaminoglycan content, increase in the proportion of type III collagen and decrease in collagen linked fluorescence in the central core of 'degenerated' tendons relative to tissue from the peripheral region of the same tendon. Dry matter content and total collagen content were not significantly different between tendon zones or normal and 'degenerated' tendons. These changes suggest a change in cell metabolism and matrix turnover in the central core of the tendon and are likely to contribute to a decrease in mechanical properties in this part of the tendon, predisposing to the characteristic partial rupture of the tendon. |
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Veterinary Basic Sciences, Royal Veterinary College, North Mymms, Hatfield, UK |
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English |
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0425-1644 |
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PMID:9844973 |
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no |
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Equine Behaviour @ team @ |
Serial |
3794 |
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Henzi, S.P.; Lycett, J.E.; Weingrill, T. |
| Title |
Mate guarding and risk assessment by male mountain baboons during inter-troop encounters |
Type |
Journal Article |
| Year |
1998 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
55 |
Issue |
6 |
Pages |
1421-1428 |
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Aggressive herding of females is a frequent but not invariant response by male savannah baboons,Papio cynocephalus, to encounters with other troops. While males in some troops are consistently more likely to herd than those in others, not all inter-troop encounters result in herding, even within particular troops. This suggests that males assess the risk of male invasion posed by each encounter and respond accordingly. We used data from baboon troops in the Drakensberg mountains to determine the rules males follow in deciding whether to herd. Consistent differences between troops were explained only by the adult sex ratio. Males were more likely to herd if the sex ratio of their own troop was female biased, a finding that is concordant with the observation that males are more likely to immigrate into troops where the sex ratio is more female biased than the population average. Differences within troops were a consequence only of encounter distance, with herding being more likely at closer distances. We found a negative correlation between the angle of approach to the other troop and the subsequent angle of deflection. We interpret this to mean that herding functions to increase the distance between the interacting troops, thereby curtailing opportunities for strange males to inspect the troop and determine its sex ratio. In this way, possibly unlike those in other populations, the decision rules of these male baboons are geared to protecting longer-term reproductive prospects. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5311 |
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| Author |
Galef, B. G. JR; White, D.J. |
| Title |
Mate-choice copying in Japanese quail, Coturnix coturnix japonica |
Type |
Journal Article |
| Year |
1998 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
55 |
Issue |
3 |
Pages |
545-552 |
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no |
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1814 |
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| Author |
Vallortigara G. |
| Title |
Minds of Their Own |
Type |
Journal Article |
| Year |
1998 |
Publication |
Trends in Cognitive Sciences |
Abbreviated Journal |
Trends. Cognit. Sci. |
| Volume |
2 |
Issue |
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Pages |
118-118 |
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refbase @ user @ |
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3466 |
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Oakenfull, E.A.; Ryder, O.A. |
| Title |
Mitochondrial control region and 12S rRNA variation in Przewalski's horse (Equus przewalskii) |
Type |
Journal Article |
| Year |
1998 |
Publication |
Animal Genetics |
Abbreviated Journal |
Anim Genet |
| Volume |
29 |
Issue |
6 |
Pages |
456-459 |
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Animals; DNA, Mitochondrial/*genetics; Female; *Genetic Variation; Horses/*genetics; Male; Pedigree; RNA, Ribosomal/*genetics |
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Variation in the control region and the 12S rRNA gene of all surviving mitochondrial lineages of Przewalski's horse was investigated. Variation is low despite the present day population being descended from 13 individuals probably representing animals from three different regions of its range. Phylogenetic comparison of these sequences, with sequences for the domestic horse, does not resolve the ancestral status of either horse. |
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Center for Reproduction of Endangered Species, Zoological Society of San Diego, CA 92112, USA |
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English |
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0268-9146 |
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PMID:9883508 |
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Equine Behaviour @ team @ |
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5040 |
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Vetvik, H.; Grewal, H.M.S.; Haugen, I.L.; Åhrén, C.; Haneberg, B. |
| Title |
Mucosal antibodies can be measured in air-dried samples of saliva and feces |
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Journal Article |
| Year |
1998 |
Publication |
Journal of Immunological Methods |
Abbreviated Journal |
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| Volume |
215 |
Issue |
1–2 |
Pages |
163-172 |
| Keywords |
Saliva; Feces; IgA; IgG; Air-drying |
| Abstract |
IgA antibodies reflecting airways or intestinal mucosal immune responses can be found in saliva and feces, respectively, and IgG antibodies reflecting serum antibodies can be found in saliva. In this study, antibodies were detected in samples of saliva and feces which had been air-dried at room temperature (+20°C) or +37°C, and stored at these temperatures for up to 6 months. In saliva the antibody levels increased, while the antibodies in feces decreased upon storage. The individual IgA antibody concentrations which were adjusted by using the ratios of specific IgA/total IgA were relatively stable in both saliva and feces, and correlated with corresponding antibody levels in samples which had been stored at -20°C. The results indicate that air-dried saliva and feces can be used for semiquantitative measurements of mucosal antibodies, even after prolonged storage at high temperatures and lack of refrigeration. |
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0022-1759 |
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Equine Behaviour @ team @ |
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5996 |
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