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The map consists of 11 contigs with a total length of 34.5Mb covering 94 percent of the estimated chromosome size. The fluorescence in situ hybridization (FISH) analysis and physical mapping shows that the short arm and the pricentromeric region of the long arm are rich in heterochromatin indicating that the chromosome is very difficult to sequence.

Fast, accurate, real-time measurement of gas concentration is an important task for preventing the coal mining disaster. Combining tunable diode laser absorption spectroscopy (TDLAS) technique with distributed fiber sensing technique, a multipoint fiber-optic sensors system for gas monitoring is designed. The wavelength modulation technique and harmonic detection techniques are used to obtain the necessary sensitivity. Simulating experiment is carried out, and the influence of the laser intensity fluctuation for measurement is eliminated by I2f/I0. The detective limit of the system is below 0.05 percent, the time resolution is 1s. The system offers a simple, intrinsically safe design with fiber-optic sensors head, and carries out real-time, fast, continuous and non-intrusive measurement which meets the requirements of coal mining gas monitoring. [ABSTRACT FROM AUTHOR]