نتایج جستجو برای: transit

تعداد نتایج: 20611  

Journal: :AJNR. American journal of neuroradiology 2018
H J Choi C-H Sohn S-H You R-E Yoo K M Kang T J Yun S H Choi J-H Kim W-S Cho J E Kim

BACKGROUND AND PURPOSE The effect of delayed transit time is the main source of error in the quantitative measurement of CBF in arterial spin-labeling. In the present study, we evaluated the usefulness of the transit time-corrected CBF and arterial transit time delay from multiple postlabeling delays arterial spin-labeling compared with basal/acetazolamide stress technetium Tc99m-hexamethylprop...

Journal: :Gut 1996
L P Degen S F Phillips

BACKGROUND AND AIMS Measurements of gastrointestinal transit are made in clinical and research gastroenterology, yet their intrinsic variability is not well characterised. In particular, an influence of hormones on transit has been proposed as the basis for gastrointestinal symptoms that vary with the menstrual cycle. Our aims were to quantify individual differences in transit during the menstr...

Journal: :Journal of pharmaceutical sciences 2001
S Haruta K Kawai S Jinnouchi K I Ogawara K Higaki S Tamura K Arimori T Kimura

The gastrointestinal (GI) transit and absorption of orally administered theophylline, a highly absorbable drug without presystemic elimination, were investigated under fasted and fed conditions using three rats in a crossover study. To evaluate the GI transit rate for each segment in vivo, a noninvasive technique, gamma scintigraphy, was employed using a nonabsorbable compound, (99m)Tc-labeled ...

2017
Xin Li

Public transit systems in the United States often face multiple policy objectives. Typically, stakeholders desire frequent service on an extensive network, but funding and other resources are constrained, creating complicated relationships between service effectiveness goals and business efficiency goals. Using data from the National Transit Map (NTM), this study evaluated the general performan...

2014
Bryce Croll Saul Rappaport Alan M. Levine

Kawahara and collaborators analyzed the transits of the candidate disintegrating Mercury-mass planet KIC 12557548b and suggested that the transit depths were correlated with the phase of the stellar rotation. We have carried out a more extensive and comprehensive analysis of the transit depths of KIC 12557548b and confirm that there is indeed a robust, statistically significant signal in the tr...

2005
Todd Litman Darrell Clarke

This study evaluates rail transit benefits based on a comprehensive analysis of transportation system performance in major U.S. cities. It finds that cities with large, wellestablished rail systems have significantly higher per capita transit ridership, lower average per capita vehicle ownership and annual mileage, less traffic congestion, lower traffic death rates, lower consumer expenditures ...

Journal: :Gut 1975
D K Payler E W Pomare K W Heaton R F Harvey

In 18 students and two members of staff at a boys' boarding school, the time taken to pass 20 out of 25 radiopaque pellets varied from one to seven days while the subjects were eating a normal English diet. After the additon of bran, about 20 g daily, to this diet transit time fell from 2-75 plus or minus 1-6 to 2-0 plus or minus 0-9 days (P smaller than 0-025). Transit became faster in all nin...

Journal: :Nature 2016

Journal: :Packaging Technology and Science 1994

Journal: :American Journal of Physiology-Legacy Content 1952

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