conclusions the predictive value of the two statistically significant red flags only marginally raises the clinical suspicion of spinal cord or cauda equina compression. effective risk stratification of patients presenting to the ed with acute back pain is crucial; however, this study did not support the use of these red flags in their current form. patients and methods it was a retrospective c...

A recent experiment has shown “inverted drafting” in flags: the drag force on one flag is increased by excitation from the wake of another. Here we use vortex sheet simulations to show that inverted drafting occurs when the flag wakes add coherently to form strong vortices. By contrast, normal drafting occurs for higher-frequency oscillations, when the vortex wake becomes more complex and mixed...

OBJECTIVES To evaluate the performance of automated leucocyte (white blood cell; WBC) counting by comparison with manual counting. METHODS The number of WBC was determined in heparinized synovial fluid samples by the use of (i) a standard urine cytometer (Kova) and a microscope (reference method) and (ii) a haematology analyser (Sysmex XE-2100; WBC/BASO and DIFF channels). Imprecision within ...

! Gilbert Baker designed the rainbow flag for the 1978 San Francisco's Gay Freedom Celebration. In the original eight-color version, pink stood for sexuality, red for life, orange for healing, yellow for the sun, green for nature, turquoise for art, indigo for harmony and violet for the soul.! First unveiled on 12/5/98 the bisexual pride flag was designed by Michael Page. This rectangular flag ...