摘要:
A polishing apparatus for polishing a workpiece such as a semiconductor wafer has a turntable with a polishing surface, and a top ring for holding a workpiece and pressing the workpiece against the polishing surface under a first pressing. The polishing apparatus has a pressurized fluid source for supplying pressurized fluid, and a plurality of openings provided in the holding surface of the top ring for ejecting the pressurized fluid supplied from the pressurized fluid source. A plurality of areas each having the openings are defined on the holding surface so that the pressurized fluid is selectively ejectable from the openings in the respective areas.
摘要:
An aminoglycoside compound of the following formula ##STR1## wherein one of R.sub.1 and R.sub.2 represents a hydrogen atom and the other, a methyl group, R.sub.3 represents a hydrogen atom or an amino acyl group having 2 to 5 carbon atoms, R.sub.4 represents a lower alkyl group substituted by one or two substituents selected from the class consisting of hydroxy and amino groups, or a hexopyranosyl group whose hydroxy groups may be substituted by amino groups,and a pharmaceutically acceptable acid addition salt thereof; and an antibiotic composition comprising said compound and its pharmaceutically acceptable acid addition salt.
摘要:
This invention relates to new processes for the production of a 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-3'-deoxy-5-O-pentofuranosylneamine, including 3'-deoxybutirosins A and B, as a semi-synthetic antibiotic. This invention further relates to new and useful semi-synthetic antibiotics which are produced by the above new processes.
摘要:
Lividomycin B derivatives having enhanced antibacterial activity are provided; the 6'-deoxy-6' substituted or unsubstituted amino lividomycins are prepared by masking the functional groups other than the 4' - and 6' -hydroxyl groups, converting the 6' hydroxyl group to an amino group and then removing the remaining protective groups.