A simple model of infective endocarditis was produced in rats. With the aid of a guide wire, polyethylene catheters were passed into the left ventricle through the right carotid artery of Sprague-Dawley rats weighing 300 to 350 g. A volume of 1 ml of an overnight culture of Streptococcus mitis, Staphylococcus aureus, or Streptococcus faecalis was intravenously injected 1 to 2 days after cathete...

Outbred Hartley male guinea pigs (300-400 g) were infected intradermally with various concentrations of Treponema pallidum Nichols strain in the pubic region. The median lethal dose (ID50) was approximately 10(5). The animals produced lesions visible by darkfield microscopy, treponemal antibodies (IgG only), and histopathological changes in the lymphoid organs. Though less susceptible to T pall...

in the present paper the behavior of an elastically mounted cylinder in low and high mass-damping ratio is investigated. for high mass-damping ratio, a classical wake oscillator model is used. at the first, by neglecting all damping and nonlinear terms of this model, the possibility of using a linear model for determination of the lock-in range and the dominant mode is investigated. then, witho...

The overall cancer incidence rate declines at old ages. Possible causes of this decline include the effects of cross-sectional data that transform cohort dynamics into age patterns, population heterogeneity that selects individuals susceptible to cancer, a decline in some carcinogenic exposures in older individuals, underdiagnostics, and the effects of individual aging that slow down major phys...

The use of cell culture methods in Plastic Surgery opened a new horizon in the research of cellular mechanisms of proliferation and biosynthesis functions. Several types of cells have been investigated in the cutaneous compartment. Keratinocytes and fibroblasts have been studied aiming the possibility of developing biomaterial for skin substitution. The present study describes the standardizati...

objective: this study was conducted to investigate the effectiveness of education based of the cognitive, metacognitive, and behavioral model on the reduction of meta-worry beliefs in patients with social anxiety disorder (sad). methods: the research was a quasi-experimental study with pretest-posttest design and a control group. the statistical population comprised all patients with sad referr...