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52 results for “Rattus norvegicus; Rattus rattus”
Figure 2 in Necrophagous or predators? The role of Pheidole radoszkowskii Mayr (Hymenoptera: Formicidae) on Rattus norvegicus (Berkenhout) carcasses (Rodentia: Muridae)
Figure 2. Average number of Pheidole radoszkowskii that exhibited necrophagous feeding behaviour – NFB – (fed on exudates and on pieces of flesh from the carcass) and predatory feeding behaviour – PFB – (predated on fly larvae).
Fig. 7 in Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus)
Fig. 7. Spatial distribution of Norway rats (Rattus norvegicus) infected with Eucoleus sp. and/or with associated stomach pathology in the Downtown Eastside of Vancouver, Canada. There are no clusters of affected rats.
Fig. 6 in Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus)
Fig. 6. Eucoleus sp. egg collected from a female worm embedded in the non-glandular stomach mucosa of a wild, Norway rat (Rattus norvegicus). (A) Photomicrogaph of an egg taken with correct focus (B) Photomicrogaph of the same egg as in A, but taken in an elevated focus targeting the egg shell. Note the dense network of anastomosing ridges.
Fig. 4 in Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus)
Fig. 4. Female Eucoleus sp. embedded in the mucosa of non-glandular stomach of a wild, Norway rat (Rattus norvegicus). Black arrows point to the meandering nematode. Red arrows points to eggs in uterus. Blue lines indicate the width (~60 µm) of the nematode at various positions. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 5 in Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus)
Fig. 5. Tail of a male Eucoleus sp. collected from the non-glandular stomach mucosa of a wild, Norway rat (Rattus norvegicus). Note the slender long moderately sclerotized spicule (black arrow) with cuticular spine covered spicular sheath (red arrow). Blue arrow points to posteriorly directed two minute lobes of the rudimentary pseudo bursa. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 2 in Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus)
Fig. 2. Cross-sections of Eucoleus sp. adults (arrows) and eggs (arrowheads) within the keratin and superficial mucosa of the esophagus in a wild Norway rat (Rattus norvegicus). Scale bar = 100 µm.
Fig. 3 in Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus)
Fig. 3. Eucoleus sp. eggs (arrow) embedded within hyperkeratosis (A) in the nonglandular stomach of a wild, Norway rat (Rattus norvegicus). There is mucosal hyperplasia (B) and subcutaneous granulocytic inflammation (‡). Scale bar = 100 µm.
Fig. 1 in Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus)
Fig. 1. Squamous papilloma (arrow) arising from the non-glandular stomach of a wild Norway rat (Rattus norvegicus) from Vancouver, Canada. Asterisk (‡) indicates the unaffected glandular stomach. Scale bar = 1 cm.
Data from: Urban rat races: spatial population genomics of brown rats (Rattus norvegicus) compared across multiple cities
Urbanization often substantially influences animal movement and gene flow. However, few studies to date have examined gene flow of the same species across multiple cities. In this study, we examine brown rats (Rattus norvegicus) to test hypotheses about the repeatability of neutral evolution across four cities: Salvador, Brazil; New Orleans, USA; Vancouver, Canada; New York City, USA. At least 150 rats were sampled from each city and genotyped for a minimum of 15,000 genome-wide SNPs. Levels of genome-wide diversity were similar across cities, but varied across neighborhoods within cities. All four populations exhibited high spatial autocorrelation at the shortest distance classes (< 500 m) due to limited dispersal. Coancestry and evolutionary clustering analyses identified genetic discontinuities within each city that coincided with a resource desert in New York City, major waterways in New Orleans, and roads in Salvador and Vancouver. Such replicated studies are crucial to assessing the generality of predictions from urban evolution, and have practical applications for pest management and public health. Future studies should include a range of global cities in different biomes, incorporate multiple species, and examine the impact of specific characteristics of the built environment and human socioeconomics on gene flow.
Evaluation of the immunostimulant effect of microvesicles of Lactobacillus acidophilus isolated from wild Rattus norvegicus.
<p><span>Lactic acid bacteria are components of the microbiota of the gastrointestinal tract in both humans and animals and are widely used as probiotics. The bacterial strain <em>Lactobacillus sp</em>. is the most related to probiotic activity and released<span> </span>membrane microvesicles (MVs). Some of their primary functions are to carry and transmit antigens to the host tissues and modulate the host defense responses. In the present study, <em>Lactobacillus acidophilus</em> was isolated from the ileum of free-living <em>Rattus norvegicus</em> to evaluate the immunostimulant effect of their MVs in two biological models. MVs from <em>L. acidophilus</em> were characterized using sodium dodecyl sulfate-polyacrylamide gel electrophoresis, electron microscopy</span><span>, and nanoparticle tracking analysis. The immunostimulant effect of</span><span> MVs</span><span> from </span><em><span>L. acidophilus</span></em><span> on ovine abomasal explants, previously stimulated with 30 µg/1h of MVs and subsequently challenged with third-stage larvae (L3) of <em>Haemonchus contortus</em>, was probed, demonstrating a decrease in the percentage of larvae association, and favoring the migration of inflammatory cells to the infection site. In contrast, cells line of the RAW 264.7 were stimulated by 10 µg/3h of MVs from <em>L. acidophilus</em> to evaluate their activation through the expression of transcripts coding for IL-1β and TNF-α. In both cases, the immunostimulatory effect</span><span>s of </span><span>MVs<em> </em><span>from <em>L. acidophilus</em></span> isolated from free-living <em>R. norvegicus</em> were verified, demonstrating that these structures are capable of immunostimulated the </span><span>evaluated biological models and </span><span>could carried important antigen that can be considerate in a formulation to promote the intestinal health in livestock production.<span> </span>The present study is the first report of MVs secreted by <em>L. acidophilus</em> isolated from free-living <em>R. norvegicus </em>caring that this rodent is resistant to many bacterial pathogens that normally affect the gastrointestinal tract of other mammals.</span></p> <p><span>In the atachment file we present the data obtained of the porcentage of asocciation and porcentage of mortality of L3 stage larvae from <em>H. contort</em></span><span><em>u</em>s in abomasal tissue stimulated with microvesicles from <em>L. acidophilus</em>. In the other hand the expression of IL-1</span><span>β</span><span> and TNF</span><span>α. </span><span> mRNA from RAW 264.7 cells stimulated with microvesicles from <em>L. acidophilus.</em> </span></p>
The Effect of Bone Graft Substitute in Healing Fractures with Bone Defects Through Examination of Alkaline Phosphatase and Radiology in the Murine Model (Rattus norvegicus) Wistar strain
<p>Raw data for manuscript with the title <strong>The Effect of Bone Graft Substitute in Healing Fractures with Bone Defects Through Examination of Alkaline Phosphatase and Radiology in the Murine Model (<em>Rattus norvegicus</em>) Wistar strain </strong></p>
Evaluation of the impact of chemical control on the ecology of Rattus norvegicus of an urban community in Salvador, Brazil
<p>dataset of rodent trapping in a pre/post-intervention scheme. Check publication of the same name for details on the study design. File contains complete comprehensive codebook.</p>
Comparative phylogeography of two commensal rat species (Rattus tanezumi and R. norvegicus) in China: Insights from mitochondiral DNA, microsatellite and RADseq
<p><em><span>Rattus norvegicus</span></em><span> and </span><em><span>Rattus tanezumi</span></em><span> are dominant species of Chinese house rats, but the colonization and demographic history of two species in China have not been thoroughly explored.</span><span> Phylogenetic analyses with mitochondrial DNA including 486 individuals from 31 localities revealed that </span><span><em>R</em>. <em>norvegicus</em></span><span> is widely distributed in China, </span><span>R. <em>tanezumi</em></span><span> is mainly distributed in southern China with currently invading northward; northeast China was the natal region of </span><span><em>R</em>. <em>norvegicus</em></span><span>, while the spread of </span><span><em>R</em>. <em>tanezumi</em></span><span> in China most likely started from the southeast coast. A total of 123 individuals from 18 localities were subjected to 2b‐RAD analyses. In the neighbor‐joining tree, individuals of </span><span><em>R</em>. <em>tanezumi</em></span><span> grouped into geographic‐specific branches, and populations from the southeast coast were ancestral groups, which confirmed the colonization route from the southeast coast to central and western China. However, individuals of </span><span><em>R</em>. <em>norvegicus</em></span><span> were generally grouped into two clusters instead of geographic‐specific branches. One cluster comprised inland populations, and another cluster included both southeast coast and inland populations, which indicated that the spread history of </span><span><em>R</em>. <em>norvegicus</em></span><span> in China was complex; in addition to on‐land colonization, shipping transportation also played a great role. ADMIXTURE and principal component analyses provided further supports for the colonization history. Demographic analyses revealed that climate changes at ~40,000 to 18,000 years ago and ~4000 years ago had led to population declines of both species; the </span><span>R<em>.</em> <em>norvegicus</em></span><span> declined rapidly while the population of </span><span><em>R</em>. <em>tanezumi</em></span><span> continuously expanded since ~1500 years ago, indicating the importance of interspecies' competition in their population size changes. Our study provided a valuable framework for further investigation of phylogeography of two species in China.</span></p>
Comparative phylogeography of two commensal rat species (Rattus tanezumi and R. norvegicus) in China: Insights from mitochondiral DNA, microsatellite and RADseq
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Data from: Global population divergence and admixture of the brown rat (Rattus norvegicus)
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Data from: Urban rat races: spatial population genomics of brown rats (Rattus norvegicus) compared across multiple cities
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Data from: Global origins of invasive brown rats (Rattus norvegicus) in the Haida Gwaii archipelago
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In vivo differentially-expressed genes in Peromyscus leucopus, Mus musculus, and Rattus norvegicus blood in response to LPS
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Konza Prairie site, station Konza Prairie LTER watershed 001d, study of animal abundance of Rattus norvegicus in units of numberPerTransectLinePer4DayTrapSeason on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Konza Prairie (KNZ) contains animal abundance of Rattus norvegicus measurements in numberPerTransectLinePer4DayTrapSeason units and were aggregated to a yearly timescale.
Konza Prairie site, station Konza Prairie LTER watershed 004b, study of animal abundance of Rattus norvegicus in units of numberPerTransectLinePer4DayTrapSeason on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Konza Prairie (KNZ) contains animal abundance of Rattus norvegicus measurements in numberPerTransectLinePer4DayTrapSeason units and were aggregated to a yearly timescale.
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OpenNeuro
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