In order to understand insertion/delation polymorphism of the angiotensin-converting enzyme gene in pilots,and to explore the relationship between ACE gene I/D polymorphism and the perfomance of the pilots,the polymerase chain reaction was used to determine the genotypes for an I/D polymorphism in intron 16 of the ACE gene in 118 pilots and 96 healthy subjects as controls.

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In image processing, method as follows will be introduced in this paper: a method combining image threshold iterative segmentation with threshold interpolation, edge detection operator Sobel and LoG, edge linking method using delation operator based on mathematical morphology, using boundary tracking and projection method in edge distill process. Through this method, measurement of wheelset will be met precision demand.

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Espionage, delation, quarrels between heads and tutors, rejection of Puseyites standing for fellowships, and a heated suspicion as though a second Popish Plot were in the air, made this time at Oxford a drama which Dean Church likens to the Greek faction-fights described by Thucydides.

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