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Human 17β-hydroxysteroid dehydrogenase type 1 (17β-HSD1), a potential target in breast cancer prevention and therapy, was extracted from human placenta and immobilized on nonporous silica (∼5 μm) with a covalent method for the first time. The optimum initial enzyme concentration and immobilization time during the immobilization process were 0.42 mg mL−1 and 12 h, repectively. The binding was confirmed...
The canonical 4-D Chua's circuit is a special one of the higher dimensional Chua's circuits and can realize every eigenvalue of four dimensions. This paper studies hyper-chaos in this circuit in two cases: one is applying the three-segment odd symmetrical piecewise-linear resistor; the other is applying the two-segment piecewise-linear resistor. The dynamical behaviors of the circuit are investigated...
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