WordNet

(library science) the count of books that are loaned by a library over a specified period
movement through a circuit; especially the movement of blood through the heart and blood vessels
number of copies of a newspaper or magazine that are sold; "by increasing its circulation the newspaper hoped to increase its advertising"
the spread or transmission of something (as news or money) to a wider group or area
free movement or passage (as of cytoplasm within a cell or sap through a plant); "ocean circulation is an important part of global climate"; "a fan aids air circulation"
the dissemination of copies of periodicals (as newspapers or magazines)
the act of observing something (and sometimes keeping a record of it); "the monitoring of enemy communications plays an important role in war times"

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Rapid translation of circulating tumor cell biomarkers into clinical practice: technology development, clinical needs and regulatory requirements.

King JD, Casavant BP, Lang JM.SourceDepartment of Medicine, Wisconsin Institutes for Medical Research, University of Wisconsin, 1111 Highland Ave., Madison, WI 53705, USA. jmlang@medicine.wisc.edu.
Lab on a chip.Lab Chip.2014 Jan 7;14(1):24-31. doi: 10.1039/c3lc50741f. Epub 2013 Nov 5.
The great hope in circulating tumor cell (CTC) research lies in the use of these rare cells as an accessible "fluid biopsy" that would permit frequent, minimally invasive sampling of tumor cells for similar molecular assays that are performed on traditional biopsies. Given the rarity of CTCs in peri
PMID 24190548

In vivo real-time visualization of tissue blood flow and angiogenesis using Ag2S quantum dots in the NIR-II window.

Li C, Zhang Y, Wang M, Zhang Y, Chen G, Li L, Wu D, Wang Q.SourceSuzhou Key Laboratory of Nanomedical Characterization, Division of Nanobiomedicine and i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.
Biomaterials.Biomaterials.2014 Jan;35(1):393-400. doi: 10.1016/j.biomaterials.2013.10.010. Epub 2013 Oct 15.
Improving the tissue penetration depth and spatial resolution of fluorescence-based optical nanoprobes remains a grand challenge for their practical applications in in vivo imaging, due to the scattering and absorption and endogenous autofluorescence of living tissues. Here, we present that Ag2S qu
PMID 24135267

Sharma VK, Wong KS.SourceDivision of Neurology, National University Hospital, Singapore, Singapore Division of Neurology, Prince of Wales Hospital, Chinese University of Hong Kong, Hong Kong, SAR, China.
Frontiers of neurology and neuroscience.Front Neurol Neurosci.2014;33:123-34. doi: 10.1159/000353193. Epub 2013 Oct 11.
Cerebrovascular ultrasonography is the only modality that provides real-time information about blood flow in various cervicocerebral arteries. Continuous information can be obtained over extended periods with high resolution and excellent spatial display. Hemodynamic changes in the cerebral circulat
PMID 24157561