Results 241 to 250 of about 646,713 (287)
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Reproductive Parameters in Rattus rattus and Rattus exulans of Hawaii, 1968 to 1970
Journal of Mammalogy, 1972Reproductive parameters were assessed in populations of the roof rat ( Rattus rattus ) and the Polynesian rat ( Rattus exulans ) in Hawaii for 1 year as a step in understanding population regulation in these species. Populations of the roof rat undergo a yearly cycle in which density is highest and reproduction is lowest in the winter.
R H, Tamarin, S R, Malecha
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The Roof Rat, Rattus rattus, in Virginia
Northeastern Naturalist, 2022We collected a single specimen of Rattus rattus (Roof Rat) in Highland County, VA, a previously unknown locality for the species. We collected ecto- and endoparasites, including the louse Polyplax spinulosa, the tick Dermacentor variabilis (American Dog Tick), and the nematode Aspicularis americana.
Eckerlin, Ralph P. +3 more
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Feeding Patterns of Rattus rattus and Rattus exulans on Eniwetok Atoll, Marshall Islands
Journal of Mammalogy, 1971In conjunction with studies of the rodent populations of the former nuclear test site at Eniwetok Atoll, the feeding patterns of Rattus rattus and Rattus exulans were determined by food acceptance tests, histological examination of stomach contents, and observation of animals under both natural and cage conditions.
M W, Fall, A B, Medina, W B, Jackson
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1971
As we now know, there are two basic chromosome numbers for R. >rattus, one 42 (Folio 229) and the other 38. Apparently Robertsonian processes were involved in the establishment of the two karyotypes (3). Data are rapidly accumulating in regard to the distribution of these two basic numbers over the globe.
T. C. Hsu, Kurt Benirschke
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As we now know, there are two basic chromosome numbers for R. >rattus, one 42 (Folio 229) and the other 38. Apparently Robertsonian processes were involved in the establishment of the two karyotypes (3). Data are rapidly accumulating in regard to the distribution of these two basic numbers over the globe.
T. C. Hsu, Kurt Benirschke
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Paracrystalline Hæmoglobin as a Species Difference between Rattus norvegicus and Rattus rattus
Nature, 1961THE common laboratory white rat is almost always the albino variety of the Norway rat (brown rat, Rattus norvegicus)1,2 and only exceptionally the albino variety of the black rat (Rattus rattus)3. The two species are morphologically similar, which makes it rather difficult to distinguish them.
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The hyoid complex of Rattus rattus rufescens
Journal of Zoology, 1967The hyoid apparatus of the rat consists of an anteroposterior compressed and somewhat arched basihyal, the small anterior cornua and the more prominent posterior cornua. The ceratohyal is the only movably articulated element of the anterior cornu and is generally lost during the normal methods of preparing skeleton.
D. R. Sharma, S. Sivaram
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Leptospirosis in Rattus norvegicus and Rattus rattus in Israel.
Israel journal of medical sciences, 1982Leptospires were isolated from 21.2% of Rattus norvegicus (the brown rat) and 9.9% of Rattus rattus trapped in a survey of urban and rural areas in Israel. Microagglutination antibodies were found in sera of 9.4 and 8.1% of these rats, respectively. The 191 strains isolated belonged to six serogroups: Leptospira icterohaemorrhagiae (169), L.
I, Lindenbaum, E, Eylan
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HERPESVIRUS INFECTION IN THE BLACK RAT (Rattus rattus)
Journal of Wildlife Diseases, 1973A condition characterized by hepatomegaly, splenomegaly and pulmonary echymoses was found in a wild black rat. The disease was successfully transmitted to laboratory rats and mice by intraperitoneal, intranasal and intracerebral inoculations. Microscopy indicated that the condition was probably caused by a herpesvirus.
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Survey of Cardiovascular Pathology in Wild Urban Rattus norvegicus and Rattus rattus
Veterinary Pathology, 2014Norway ( Rattus norvegicus) and black rats ( Rattus rattus) are common commensal pests, yet little is known about the ecology of wild rats, including their natural diseases. We describe microscopic cardiovascular pathology in a subset of a sample of 725 wild urban rats.
J L, Rothenburger +3 more
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The expression of cardiac output in the albino rat, Rattus rattus
Comparative Biochemistry and Physiology, 1970Abstract 1. 1. Cardiac output determinations by thermodilution in small animals appeared to be 1·6 times higher when compared to the direct Fick method and other indicator dilution techniques. 2. 2. The cardiac output (CO,ml/min) body weight (W, g) was found to be best expressed as an allometric equation: CO = 3·826 W0·582. 3.
Y C, Lin, C A, Dawson, S M, Horvath
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