The geotropic orientation of Rattus rattus (roof rat) obeys the equations previously found applicable for Rattus norvegicus. The former is more sensitive, geotiopically, and the numerical values of the constants in the equations for the two forms are found to differ significantly. Certain consequences of this difference are pointed out.

rodents are well established at port areas and their ectoparasite can be vectors of many diseases. ships at seaport play an important role in spreading disease by transporting infected vectors. plague, murine typhus, salmonellosis, trichinosis, leptospirosis and rat bite fever are known to be spread by rats. in view of the seriousness of the problem present study was undertaken to assess the pr...

objective: toxoplasmosis infection has spread throughout the world, it is created by the intracellular protozoan toxoplasma gondii. toxoplasma cause changes in the behavior of the rodents. rodents play an important role in the life cycle of the toxoplasma gondii, they are the main infection reservoir of the domestic cats. the purpose of this study was to investigation toxoplasma infection in th...

A survey was conducted on rodents from the Riyadh City and surroundings. Two species of fleas, Xenopsylla cheopis and Ctenocephalides felis felis together with Polyplax spinulosa were collected. The highest infestation rate by both fleas occurred on Rattus rattus followed by Rattus norvegicus and Mus musculus. Females of R. rattus and R. norvegicus were more infested by fleas than males. On the...

Biological invasions result in novel species interactions, which can have significant evolutionary impacts on both native and invading taxa. One evolutionary concern with invasions is hybridization among lineages that were previously isolated, but make secondary contact in their invaded range(s). Black rats, consisting of several morphologically very similar but genetically distinct taxa that c...

Short-chain fatty acid (SCFA) transport across the colon may occur by nonionic diffusion and/or via apical membrane SCFA-/[Formula: see text]exchange. To examine the relative importance of these processes, stripped segments of rat ( Ratus ratus) proximal and distal colon were studied in Ussing chambers, and the unidirectional fluxes of radiolabeled SCFA butyrate, propionate, or weakly metaboliz...

In this study we examine the size of primary sensory areas in the neocortex and the cellular composition of area 17/V1 in three rodent groups: laboratory nocturnal Norway rats (Long-Evans; Rattus norvegicus), wild-caught nocturnal Norway rats (R. norvegicus), and laboratory diurnal Nile grass rats (Arvicanthis niloticus). Specifically, we used areal measures of myeloarchitecture of the primary ...

Fifteen experimental treatments with rodenticidal baits containing 0.1, 0.15 or 0.2% flupropadine were conducted on farmsteads against Rattus norvegicus infestations. Eight treatments were completely successful and the others gave kills ranging from 36 to 72% in 28 days. Treatments with 0.1 and 0.15% flupropadine were less successful against large infestations than against small ones. Flupropad...

Norway rats were eradicated on bush-covered Hawea Island (9 ha) in Breaksea Sound, using the anticoagulant rodenticide "Talon 50 WB" (brodifacoum). The work was done as a conservation measure and to evaluate the feasibility and costs of eradicating rodents quickly from islands. The 50-100 rats present were eradicated in about two weeks by applying a simple strategy that took full account of the...