We used combined two-dimensional and pulsed Doppler echocardiography to examine 37 infants and children with coarctation of the aorta and 19 normal subjects. The ages ranged from 1 day to 16 years. We compared the differences between the Doppler flow signal from the ascending aorta and the descending aorta below the coarctation in each patient, as well as the differences between the correspondi...

OBJECTIVES To investigate the effect of walkway length (5, 8 or 10 m) on measurements of comfortable and maximum walking speed. DESIGN A cross-sectional study. SETTING University-based rehabilitation centre. SUBJECTS Patients (n = 25) with chronic stroke. METHODS Timed walking with different walkway lengths (5, 8 and 10 m) walkways were recorded using a stop-watch. RESULTS No signific...

Longitudinal height and weight data from 4649 Dutch twin pairs between birth and 2.5 years of age were analyzed. The data were first summarized into parameters of a polynomial of degree 4 by a mixed-effects procedure. Next, the variation and covariation in the parameters of the growth curve (size at one year of age, growth velocity, deceleration of growth, rate of change in deceleration [i.e., ...

The rate of molecular evolution is not constant across the Tree of Life. Characterizing rate discrepancies and evaluating the relative roles of time and rate along branches through the past are both critical to a full understanding of evolutionary history. In this study, we explore the interactions of time and rate in filmy ferns (Hymenophyllaceae), a lineage with extreme branch length differen...

Abstract The rheological properties of cement pastes prepared using kenaf-plant cellulose microfibers (CMFs), which was incorporated for the purpose internal curing, were investigated. main test variables are length and mass fraction CMFs. CMFs lengths 400 ?m 5 mm included in mixtures at 0.3, 0.6, 1, 2 wt.% cement. Dry CMF particles wetted with water to fiber saturation point vacuum filtration ...

Eco-drive is a widely used concept. It can improve fuel economy for different driving behaviors such as vehicle acceleration or accelerator pedal operation, deceleration coasting while slowing down, and gear shift timing difference. The feasibility of improving the urban buses by applying eco-drive was verified analyzing data from drivers who achieved high efficiencies in with frequency acceler...

A clear understanding of the relationship between two photosynthetic capacity parameters, maximum carboxylation rate (Vcmax) and electron transport (Jmax), is expected to reveal plant physiology strategies critical in determining carbon water cycle terrestrial biosphere. Increasing evidence recent suggests unstable spatiotemporal contexts, casting a doubt on deriving Jmax solely from single lin...