The total syntheses of teixobactin and a series of its stereoisomers at positions 2, 5, 6, 10 and 11 were achieved via a combined strategy of solution and solid phase peptide synthesis.

KeyWordsColumn liquid chromatography Linear solvation energy relationships Ferrocene-bonded sTITca statTonary phase Rete ntio n ch a racteristics SummaryThe similaritTes and dT[ferencos Tn retentTon characteristics of fermcone-bonded and other three silica based phases have been elucidated by the use of ITnear selvatTon energy relation ships (LESRs). These phases were TnvestTgated in a common mobile phase./he results of LSERs on ferrocene bonded phases are quite different from ethersilico based phases. Retention on all other sTITca based phases is dominated by ~o factors: the solute size and hydrogen bond acceptor basicity While on ferrecene bonded silica phase, the retention Ts dominated by ex cess molar refractTon and hydrogen bond acceptor basTdty. The s coefficient Ts small but posTtTve whTch Ts unlike the common reversed phase stationary phases. The rcoe[ficient is much larger and positTve showed the new phase has stronger ::-:: TnteractTon to solutes than all other phases, and hTgh selectivTly to polyaromatic hydrocarbons.

Indoor localization systems based on Wi‐Fi signal strength fingerprinting techniques are widely used in office buildings. However, a general problem of these systems pertains to Wi‐Fi signal degradation due to the environmental factors. And also, these systems cannot be used in the environments not covered with Wi‐Fi signals or the environments with only a single Wi‐Fi access point. In this paper, a new indoor location fingerprinting system using both FM radio and Digital Television Terrestrial Multimedia Broadcasting (DTMB) signals is proposed. First, the indoor location fingerprinting using FM radio and DTMB signals is theoretically analyzed to confirm its feasibility. Then, a specially designed combined strength fingerprinting location algorithm is proposed for the location system, which is achieved on the USRP2 platform. Finally, the system is tested in a typical indoor environment. The theoretical analysis and the tests show that the indoor location fingerprinting system using FM radio and DTMB signals has a similar localization accuracy to the Wi‐Fi signal strength fingerprinting location system, while it has a wider coverage area, a lower maintenance cost, and more stable signal strength, which makes it a practical indoor positioning method.