Results 221 to 230 of about 7,676 (261)

CEREBRAL ARTERIOSCLEROSIS IN AN AGED CAPTIVE POLAR BEAR (URSUS MARITIMUS)

Journal of Zoo and Wildlife Medicine, 2002
Cerebral arteriosclerosis was observed upon necropsy of a 36-yr-old female captive polar bear (Ursus maritimus) that developed a sudden onset of seizure-like activity and died. The medium and large cerebral arteries of the meninges had moderate to severe diffuse discoloration and mineralization of the matrix of the tunica media, with little or no ...
Steven McORIST
exaly   +3 more sources

The physiology of polar bear mating (Ursus maritimus)

The FASEB Journal, 2022
The well‐being of any species depends on successful reproduction, so the study of mating is essential, mainly to prevent the extinction of rare animals. In the process of evolution, each new species has adapted to environmental conditions in the struggle for survival through the morphological and physiological characteristics of the reproductive ...
Georgy Nikitin, Alexander Malev, Alexey Batrakov   +2 more
openaire   +1 more source

MYASTHENIA GRAVIS IN A POLAR BEAR (URSUS MARITIMUS)

Journal of Zoo and Wildlife Medicine, 2004
A 14.6-yr-old, female, multiparous polar bear (Ursus maritimus) acutely developed an apparent hind limb weakness. Physical examination and diagnostic tests including a hemogram, serum biochemistry, electrolytes, radiographs, and myelogram did not provide a definitive diagnosis. No improvement in condition was noted during 4 days of supportive care, and
David E, Kenny, Jeffery, Baier, Felicia, Knightly, Daniel, Steinheimer, David M, Getzy, G Diane, Shelton   +5 more
openaire   +2 more sources

Organochlorines in polar bears (Ursus maritimus) at Svalbard

Environmental Pollution, 1997
A comprehensive survey on organochlorine (OC) contaminants in polar bears at Svalbard has been undertaken. Subcutaneous tissue, blood and milk have been sampled from anesthetized free-ranging bears of both sexes and different ages in the period from 1990 to 1994.
A, Bernhoft, Ø, Wiig, J U, Skaare
openaire   +2 more sources

Morbillivirus ecology in polar bears ( Ursus maritimus )

Polar Biology, 2000
Polar bear (Ursus maritimus) morbillivirus infection was initially reported by Follmann and co-workers in 1996, based upon serologic results using canine distemper virus (CDV). The impetus for the evaluation of polar bear populations for morbillivirus infections was prompted by epidemics of canine distemper-like disease in seal populations in the north
G. W. Garner, J. F. Evermann, J. T. Saliki, E. H. Follmann, A. J. McKeirnan   +4 more
openaire   +1 more source

Appetitive search behaviors and stereotypies in polar bears (Ursus maritimus)

Behavioural Processes, 2021
Stereotypies in captive animals have been defined as repetitive, largely invariant patterns of behavior that serve no obvious goal or function. Stereotypies are commonly attributed to boredom or stress and are typically treated by enriching captivity with distracting, appealing stimuli.
openaire   +2 more sources

Adoption in Polar Bears (Ursus maritimus)

1999
We observed a case of adoption of a single four-month-old polar bear cub (Ursus maritimus) into an existing litter of two cubs on Hopen Island, Svalbard. We believe the high density of maternity dens in the study area may increase the likelihood of natural adoption.
Derocher, A.E., Wiig, Ø.
openaire   +2 more sources

Dental and Temporomandibular Joint Pathology of the Polar Bear ( Ursus maritimus )

Journal of Comparative Pathology, 2016
Museum specimens (maxillae and/or mandibles) from 317 polar bears (Ursus maritimus) were examined macroscopically according to predefined criteria and 249 specimens were included in this study. The specimens were acquired between 1906 and 2011. There were 126 specimens (50.6%) from male animals, 93 (37.3%) from female animals and 30 (12.1%) from ...
J.N. Winer, B. Arzi, D.M. Leale, P.H. Kass, F.J.M. Verstraete   +4 more
openaire   +2 more sources

Chemical characterization of milk oligosaccharides of the polar bear, Ursus maritimus

Biochimica et Biophysica Acta (BBA) - General Subjects, 2000
Two trisaccharides, three tetrasaccharides, two pentasaccharides, one hexasaccharide, one heptasaccharide, one octasaccharide and one decasaccharide were isolated from polar bear milk samples by chloroform/methanol extraction, gel filtration, ion exchange chromatography and preparative thin-layer chromatography.
T, Urashima, T, Yamashita, T, Nakamura, I, Arai, T, Saito, A E, Derocher, O, Wiig   +6 more
openaire   +2 more sources

SULFONATION OF ENVIRONMENTAL CHEMICALS AND THEIR METABOLITES IN THE POLAR BEAR (Ursus maritimus)

Drug Metabolism and Disposition, 2005
Although its habitat comprises mostly remote regions of the Arctic, the polar bear is subject to bioaccumulation of persistent environmental pollutants. Along with their phase I metabolites, they are potential substrates for detoxification via sulfonation and glucuronidation.
James C, Sacco, Margaret O, James
openaire   +2 more sources