Abstract: A system and method for obtaining an estimate of the concentration of an odor in an air sample from data obtained by evaluating the sample with a sensor-array type electronic nose. Principal components analysis is applied to a set of air sample data including sensor-array data obtained from evaluating the air sample with the sensor-array type electronic nose and measurements of the humidity of the air sample and clean reference air used by the electronic nose to obtain a predetermined number of principal components of the air sample data. The principal components obtained from the air sample are used as inputs to a neural network to obtain as output an estimate of the concentration of the odor in the air sample.

Abstract: Aqueous parenteral solutions of from about 10 to 20% w/v of sulfamethoxazole or sulfadoxine and about 3 to 5% w/v of trimethoprim in from about 60 to 80% w/v of 2-pyrrolidone are disclosed.

Abstract: The 1:2 N,N'-dibenzylethylenediamine, the N-benzyl-2-phenylethylamine and the dibenzylamine salts of penicillanic acid 1,1-dioxide, a well-known betalactamase inhibitor, are sparingly soluble in water. Accordingly they are valuable as slow release (depot) forms of penicillanic acid 1,1-dioxide, particularly for use in conjunction with slow release (depot) forms of penicillin and cephalosporin antibiotics, in the chemotherapy of bacterial infections in mammals.

Abstract: Aqueous parenteral solutions of from about 10 to 20% w/v of sulfamethoxazole or sulfadoxine and about 3 to 5% w/v of trimethoprim in from 60 to 80% w/v of 2-pyrrolidone are disclosed.

Abstract: Pharmaceutical compositions containing magnesium-calcium-oxytetracycline mixed chelates in aqueous 2-pyrrolidone solution are disclosed.

Abstract: Aqueous solutions of oxytetracycline, doxycycline or chlortetracycline in caprolactam or 2-piperidone are disclosed.

Abstract: Aqueous solutions of doxycycline or salts thereof, a pharmaceutically acceptable soluble magnesium compound and 2-pyrrolidone as a co-solvent, said solution having a pH of 3 to 7.5 and being useful as an injectable composition combining low viscosity, high potency, good clarity and good stability.

Abstract: Aqueous solutions of chlortetracycline or salts thereof, a pharmaceutically acceptable calcium compound and 2-pyrrolidone as a co-solvent, said solution having a pH of 8 to 10 and being useful as an injectable composition combining low viscosity, high potency, good clarity and good stability.

Abstract: Aqueous solutions of tetracycline or salts thereof, a pharmaceutically acceptable soluble magnesium compound and 2-pyrrolidone as a co-solvent, said solution having a pH of 7.5 to 9.5 and being useful as an injectable composition combining low viscosity, high potency, good clarity and good stability.

Abstract: Oxytetracycline aqueous solutions containing 2-pyrrolidone as a co-solvent suitable for pharmaceutical use and especially useful for either oral, topical or parenteral administration are disclosed.