نتایج جستجو برای: squires
تعداد نتایج: 209 فیلتر نتایج به سال:
The weak distortions produced by gravitational lensing in the images of background galaxies provide a unique method to measure directly the distribution of mass in the universe. However, because the induced distortions are only of a few percent, this technique requires high precision measurements of the lensing shear and cautious corrections for systematic effects. Kaiser, Squires, & Broadhurst...
A number of different media are now in use for the culture of Trichomonas vaginalis. The medium described by Feinberg and Whittington (1957) has been used routinely in this laboratory since 1957. Whittington found that it was a more sensitive method of detecting the flagellate in secretions from the female genital tract than direct microscopical examination of fresh smears. This superiority of ...
The value of the rRNA chain elongation rate in bacteria is an important physiological parameter, as it affects not only the rRNA promoter activity but also the free-RNA polymerase concentration and thereby the transcription of all genes. On average, rRNA chains elongate at a rate of 80 to 90 nucleotides (nt) per s, and the transcription of an entire rrn operon takes about 60 s (at 37 degrees C)...
Christine Lubinski, Judith Aberg, Arlene D. Bardeguez, Richard Elion, Patricia Emmanuel, Daniel Kuritzkes, Michael Saag, Kathleen E. Squires, Andrea Weddle, Jennifer Rainey, M. Renee Zerehi, J. Fred Ralston, David A. Fleming, David Bronson, Molly Cook, Charles Cutler, Yul Ejnes, Robert Gluckman, Mark Liebow, Kenneth Musana, Mark E. Mayer, Mark W. Purtle, P. Preston Reynolds, Lavanya Viswanathan...
The arrow of time is of little consequence to the majority of physics. Except in a few cases, the laws of physics still apply whether one observes them in a reverse or in a forward manner. The contrasting notion relevant to this discussion is that our experience of time flows uni-directionally into the future. If our experimental approaches manifest as a function of our experience, then it has ...
Particle dispersion in a fully-developed turbulent flow was studied. Numerical simulations with two-way coupling were performed for downward particle-laden turbulent flows in a vertical channel. Fluid turbulence was calculated by using LES, while the particle motion was treated by Lagrangean approach. In addition, inter-particle collision was taken into consideration. In this work, we focused o...
In this paper the development of a questionnairebased usability evaluation method for e-learning applications is described. The method extends the current practice by focusing not only on cognitive but also affective considerations that may influence e-learning usability. The method was developed according to an established methodology in HCI research and relied upon a conceptual framework that...
What does language acquisition look like when it begins for the first time in adolescence? This question is difficult to answer because virtually all hearing children are exposed to spoken language from birth. Unlike the acquisition of spoken languages, however, the acquisition of signed languages is frequently delayed. In the USA, about 90% of deaf children are born to hearing parents who do n...
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