نتایج جستجو برای: rattus norvegicus

تعداد نتایج: 3915  

Journal: :Biology letters 2015
Vassilissa Dolivo Michael Taborsky

Direct reciprocity, according to the decision rule 'help someone who has helped you before', reflects cooperation based on the principle of postponed benefits. A predominant factor influencing Homo sapiens' motivation to reciprocate is an individual's perceived benefit resulting from the value of received help. But hitherto it has been unclear whether other species also base their decision to c...

2015
Bernhard Ehlers Dania Richter Franz-Rainer Matuschka Rainer G. Ulrich

We amplified and sequenced six complete genomes of a polyomavirus from feral Norway rats (Rattus norvegicus) and from a long-term breeding colony derived from Norway rats. This virus, which is closely related to hamster polyomavirus and murine polyomavirus, may contribute to understanding the evolutionary history of rodent polyomaviruses.

2013
David T S Hayman Katherine D McDonald Michael Y Kosoy

Emerging pathogens that originate from invasive species have caused numerous significant epidemics. Some bacteria of genus Bartonella are rodent-borne pathogens that can cause disease in humans and animals alike. We analyzed gltA sequences of 191 strains of rat-associated bartonellae from 29 rodent species from 17 countries to test the hypotheses that this bacterial complex evolved and diversif...

Journal: :Wiadomosci parazytologiczne 2009
Grzegorz Karbowiak Irena Wita Urszula Czaplińska

This study reports the light and electron microscopic examination of Trypanosoma (Herpetosoma) lewisi (Kent, 1880) Laveran and Mesnil, 1901, isolated from rats (Rattus norvegicus) from Poland. Bloodstream trypomastigotes were identified morphometrically from 100 specimens collected from three naturally infected rats Rattus norvegicus. Body length ranged from 15.45-23.64 microm and width from 1....

Journal: :Applied and environmental microbiology 2011
Sarah A Billeter Vijay A K B Gundi Michael P Rood Michael Y Kosoy

Of 200 individual Xenopsylla cheopis fleas removed from Rattus norvegicus rats trapped in downtown Los Angeles, CA, 190 (95%) were positive for the presence of Bartonella DNA. Ninety-one amplicons were sequenced: Bartonella rochalimae-like DNA was detected in 66 examined fleas, and Bartonella tribocorum-like DNA was identified in 25 fleas. The data obtained from this study demonstrate an extrem...

Journal: :Applied and environmental microbiology 1979
K I Kaneko S Hamada Y Kasai N Hashimoto

Yersinia pseudotuberculosis was isolated from 8 (8 Rattus norvegicus) of 270 (259 R. norvegicus and 11 R. rattus) rats examined. Seasonal variation was not found in the incidence of isolations. The isolation occurred almost equally in both young and old rats. The isolated strains were determined as serovar IB in one rat, and serovar IVA in seven rats. The strains were isolated from the contents...

2013
Paloma de Oliveira Tonietti Aline Santana da Hora Fernanda Dornellas F. Silva Karen Linares Ferrari Paulo Eduardo Brandão Leonardo José Richtzenhain Fabio Gregori

This study investigated the occurrence of rotavirus in porcine and Rattus norvegicus, at the same time, on a pig farm in the city of Jaguariúna, São Paulo, Brazil. Swine (n = 21) and rat (n = 6) fecal samples were analyzed by nested RT-PCR assay. Rotavirus occurred in seven porcine and two rat samples. A total of three pig and one rat samples were further submitted to genetic sequencing. The pa...

ژورنال: Medical Laboratory Journal 2015
ArabKhazaeli, F, , Gholipoory, M, , Namroodi, S, , Rezai, HR, ,

Abstract Background and Objective: Given the Leishmaniasis is endemic in Turkmen Sahra, we aimed to study the contamination of rodents with this disease. Material and Methods: Seventy-three rodents were collected from three regions (Gonbad, Gomishan and Bandar Turkmen) using live traps. In laboratory, morphometric characteristics were measured and for diagnosis of Leishmaniasis CL, the ...

ژورنال: :مجله پژوهش های سلولی و مولکولی 2015
حسن رجبی مهام سمیه کشتکار بهرام حسن زاده کیابی مهین میرزایی

رت ها امروزه از یک طرف مدل آزمایشگاهی بسیار مهمی به حساب می آیند و از طرف دیگر یک آفت بسیار مهم و بالقوه خطرناک می توانند باشند. مطالعه در مورد رت ها بخصوص برای شناسایی آنها، ژنتیک جمعیت شان و جغرافیای تکاملی آنها با استفاده از روش های مورفولوژیک و بالاخص مولکولی یک ضرورت است. این پژوهش با هدف شناسایی و بررسی ژنتیک رت های کلان شهر تهران با استفاده از ژنوم میتوکندری در ناحیه d-loop انجام گرفت و ...

Journal: :Revista brasileira de parasitologia veterinaria = Brazilian journal of veterinary parasitology : Orgao Oficial do Colegio Brasileiro de Parasitologia Veterinaria 2013
Vera Lúcia Coimbra Moreira Elane Guerreiro Giese Djane Clarys Baía da Silva Francisco Tiago de Vasconcelos Melo Adriano Penha Furtado Arnaldo Maldonado Jeannie Nascimento dos Santos

Calodium hepaticum (syn. Capillaria hepatica) is a trichurid nematode that parasitizes the hepatic parenchyma of rodents and other mammals. Infections in humans are rare, although they have been reported worldwide. A number of factors contribute to the distribution of this zoonosis, particularly the presence of dense populations of rodents associated with relatively poor urban environments, suc...

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