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Report is given of clinical experiences gained with the new developed semi-syntheticpenicillin "Spectacillin" on 75 patients suffering from an urological disease. The drug has been applied for therapy of acute and chronic forms of inflammations of the bladder and the urethra, additionally the prostatitis, the epididymitis, but first of all the pyelonephritis (caused bacterially). Within the germ spectrum of these diseases, germs of the coli-type, streptococcus faecalis (enterococcus), staphylococcus aureus, Neisseria gonorrhoeae, proteus, pseudomonas and aerobacter were found. Patients with acute/subacute diseases have been treated 8 to 9 days (3-4 grams per day) on an average; in case of chronic diseases, the patients received initially 1 gram a day and thereupon during 3 to 4 weeks 3 to 4 grams per day. The well-succeeded results have been documentated by means of the clinical course, the germ-elimination and the laboratory findings. The exanthematous quote may be demonstrated as remarkably low, considering the good universal compatibility of the substance. For this reason "Spectacillin" not finally is suitable for treatment of acute and chronic infections of the urogenital systems.

Presented in this article is a computer-aided experimental method for obtaining the cascade parameters of the two-port model of a miniature hearing-aid microphone. The method is an adaptation of the "two-load" method [D.P. Egolf and R.G. Leonard, J. Acoust. Soc. Am. 62, 1013-1023 (1977)] to acoustoelectric, rather than electroacoustic, transducers. The cascade parameters of a particular microphone, determined by this method, were within 2.5 dB of the manufacturer's published open-circuit sensitivity data. In an attempt to further verify the numerical cascade-parameter data, a two-port model of the microphone was used to simulate experimental voltages developed across two different complex electrical load impedances attached to the microphone. The results showed experimental/simulation differences of no greater than 3.0 dB at any frequency. The two-port microphone model and associated cascade parameters are currently being incorporated into a computer-based plan for mathematical simulation of an entire in situ hearing aid.