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physical activity and cancer fact sheet national cancer on this page what is physical activity what is known about the… Expand SUMMARY The phosphoenolpyruvate(PEP):carbohydrate phosphotransferase system (PTS) is found only in bacteria, where it catalyzes… Expand Inducible expression systems in which T7 RNA polymerase transcribes coding sequences cloned under control of a T7lac promoter… Expand Multistability, the capacity to achieve multiple internal states in response to a single set of external inputs, is the defining… Expand Membrane transport proteins that transduce free energy stored in electrochemical ion gradients into a concentration gradient are… Expand Constipation is an ailment encountered often in elderly people. A study was initiated to test the effects of lactose or inulin on… Expand NUCLEOTIDE excision repair helps to ameliorate the lethal and mutagenic consequences of DNA damage by removing helix-distorting… Expand Large quantities of yogurt are consumed by some lactase-deficient population groups. We used breath hydrogen measurements to… Expand The use of gel electrophoresis for quantitative studies of DNA-protein interactions is described. This rapid and simple technique… Expand The lactose structural genes, without the lactose promoter, have been incorporated into the bacteriophage Mu genome to form a Mu… Expand