PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Color”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 379 records · Page 21Linked to original sources
PubMed2006

Comments on "the 1993 DIMACS graph coloring challenge" and "energy function-based approaches to graph coloring".

Since all graphs in the 1993 DIMACS graph coloring challenge are undirected, each edge should be only counted once. However, in some files each edge is counted once, whereas in others each edge is counted twice; so a systematical check on the DIMACS challenge is made to eliminate the inconsistencies. Besides, the experimental results of a previous paper by Blas et al. counted each violated edges twice and neglected the inconsistencies in the DIMACS challenge. So the correct experimental results of a previous paper by Blas et al are also given.

Algorithms↗
PubMed2004

Color and shape measurement with a three-color photometric stereo system.

The purpose of our research has been to develop a system for measurement of microtopography based on the photometric stereo principle. In a previous system, in which we used two illumination directions facing each other, we had difficulties in detecting topography variations perpendicular to the illumination direction. With the new measurement system we avoid this problem by use of three colored and two white illumination modules. The integration problem that occurred when the gradient was known in more than one direction was solved by use of weight functions in the spatial-frequency domain. The results show that true three-dimensional surface height functions can be obtained with the new method. This is a significant improvement from the two-source system, in which we could make only estimates of profiles perpendicular to the illumination direction. To quantitatively evaluate the new measurement system, the results were compared with measurements of a mechanical stylus instrument. Comparisons between mechanical and optical measurements show a coefficient of determination r2 between 0.71 and 0.81 for the new system and r2 between 0.57 and 0.88 for the two-source system.

Journal Article↗
PubMed1997

Applications of single-color and double-color oligonucleotide primed in situ labeling in cytology.

Interphase cytogenetics is mostly performed with use of fluorescence in situ hybridization (FISH), using long DNA probes of several hundred or thousand base pairs in length. Recently, oligonucleotide primed in situ labeling (PRINS) was established for staining centromeres and telomeres of chromosomes in metaphase spreads by Taq-polymerase-mediated incorporation of labeled nucleotides. We investigated the use of PRINS in intact interphase cells of various cytologic preparations, targeting chromosomes 1, 8, and 9. Examining cell smears (n = 3), touch preparations (n = 20), and cytospins (n = 11) of non-neoplastic and neoplastic tissues, PRINS was as sensitive and reliable as the FISH method in assessing the exact chromosome number. Aneuploidy in tumor cells was confirmed by double-color PRINS in a part of the specimens. The PRINS reaction, which requires heating of the cell preparations to as high as 96 degrees C, did not affect the cytomorphologic details. Because PRINS is much faster and approximately 10 times less expensive than FISH, this method allows an increased application of interphase cytogenetics in diagnostic cytopathology.

Aneuploidy↗