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The proposed self-calibration method uses an artefact, a ball plate, for error identification. Unlike other methods this ball plate need not be calibrated, i.e. the distances between the different balls on the plate need not be known accurately. After measurement of the ball plate in different positions within the measuring volume, the systematic geometrical errors, like scale errors, axes' pitch, yaw and non-orthogonality, of the geometric error model of the measuring machine can be calculated. This geometrical error model is used afterwards by the software error correction to correct on-line every single measurement carried by the measuring machine. This results in a higher accuracy of the measurement. As an example, the self-calibration method has been carried out on a CNC 3-D coordinate measuring machine and the resulting software error correction has been evaluated using step-gauge measurements. The results of the evaluation show that the systematic geometrical errors are greatly reduced.
Complexes of poly(C) with copolymers of inosinic acid containing various amounts of mismatched bases (see journal for formula) have been examined for direct resistance to virus infection, interferon induction and toxicity in two different cell cultures (primary rabbit kidney cells and mouse L-929 cells). Complexes in which 20% of the hypoxanthine bases were replaced by (see journal for formula) or ms-2I were partially active whereas complexes in which 40% or more of the hypoxanthine bases were replaced by the odd bases were entirely inactive. The decrease in biological activity observed upon intrusion of (see journal for formula) or ms-2I in the poly(I) strand of poly(I) with poly(C) closely paralleled the amount of odd bases introduced irrespective of the system employed to assess the biological activity (resistance to virus infection, interferon induction or toxicity).
Numerous structurally different non-nucleoside compounds have been evaluated for their inhibitory effects against HIV replication, in which DABO derivatives, bearing the dihydro-alkoxyl-benzyl-oxopyrimidine scaffold, have been identified as a particular class of non-nucleoside reverse transcriptase inhibitors (NNRTIs). The S-DABO, NH-DABO, -N-DABO, DATNO and DACO analogs represent various structural chemical modifications of the substituents on C2, C6 and C5 of the pyrimidine ring to obtain potentially higher potency and lower cytotoxicity. This review article describes the recent progress of the chemical modifications and structure-activity relationship studies of DABO derivatives and provides new clues for the design of new DABO congeners.
