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Pancreatic cancer is a type of common malignant tumors with high occurrence in the world. Most patients presented in clinic had pancreatic cancer at advanced stages. Furthermore, chemotherapy or radiotherapy had very limited success in treating pancreatic cancer. Complementary and alternative medicines, such as natural products/herbal medicines, represent(More)
The star-chromatic number and the fractional-chromatic number are two generalizations of the ordinary chromatic number of a graph. We say a graph G is-extremal if its star-chromatic number is equal to its fractional-chromatic number. We prove that-extremal graphs G have the following nice property: For an arbitrary graph H the star-chromatic number (GH]) of(More)
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