摘要:
The invention relates to diagnostic agents for the rapid diagnostic detection of blood in excretions and body fluids, consisting essentially of a solid support which is charged with a chromogenic substance as indicator and impregnated with an acrylic and/or methacrylic resin.
摘要:
Methods for bonding a polypeptide to a macro-molecular carrier compound by irradiating an aqueous solution of the polypeptide, in the absence of oxygen and in the presence of said carrier compound, with ultraviolet light in the optional presence of a photosensitizer or with visible light in the presence of a photosensitizer and an organic peroxide.
摘要:
Water-swellable, cross-linked, bead copolymers of (A) an ethylenically unsaturated monomer having a carboxylic acid anhydride, glycidyl or succinimide group, (B) a comonomer having at least two radical-polymerizable carbon double bonds, and (C) a radical-polymerizable water-soluble comonomer are disclosed to be excellent carriers capable of bonding with biologically active substances such as enzymes, enzyme substrates, inhibitors, hormones, antibiotics, antigens, and peptides.
摘要:
What is disclosed is a method for preparing carrier systems, adaptable to the covalent bonding thereto of biologically active materials, consisting of a known solid support material having a surface coated with a polymer containing functional groups suitable for covalent bonding, by coating the support material with a film-forming polymer dispersion and a non-film-forming polymer dispersion, suitably in admixture, at least one of the two polymer dispersions containing a polymer having functional groups suitable for covalent bonding with a biologically active material.
摘要:
A time-release laminar pharmaceutical composition, comprised of rolled or folded layers of a polymer film, that contain a pharmaceutically active substance, in which the outer surface area of the polymer film which contains the active substance, and which is accessible to the digestive juices, amounts to at most 25% of the entire surface area in the rolled or folded state, and the rolled or folded layers adhere to one another in such a way that the laminar form of medication maintains its rolled or folded form for a period of at least one hour in the release test according to USP 23, Method A, apparatus 2, at 37° C. and 50 rpm, in artificial gastric juice, and at least 30% of the active substance contained in it is released in the rolled or folded state.
摘要:
The invention relates to aqueous dispersions containing A. C.sub.6-22 carboxylic acids and/or resinic acids and B. C.sub.6-22 oxoalcohols alkoxylated with 2 to less than 6 mol C.sub.2-4 alkylene oxides for deinking printed wastepaper.
摘要:
A unity gain amplifier of the diamond follower type provides the combination of negligible input offset voltage, high slew rate, and high bandwidth by providing first and second opposite polarity current mirror circuits which respond to currents flowing through first and second input transistors to boost current available to charge parasitic capacitances during fast rise times and fast fall times of an input pulse. The rapid charging and discharging of the parasitic capacitances eliminates degradation in the rise and fall times of an output pulse produced by the unity gain amplifier. The gains of the first and second current mirror circuits have values that result in critically damped high frequency response of the unity gain amplifier in response to high speed transistions of the input signal. Darlington output stages are used to avoid frequency response peaking due to current gain rolloff of the output transistors at high currents and high frequencies. The unity gain amplifier is used in high performance operational transconductance amplifier.
摘要:
A unity gain amplifier of the Diamond follower type provides the combination of negligible input offset voltage, high slew rate, and high bandwidth by providing first and second opposite polarity current mirror circuits which respond to currents flowing through first and second input transistors to boost current available to charge parasitic capacitances during fast rise times and fast fall times of an input pulse. The rapid charging and discharging of the parasitic capacitances eliminates degradation in the rise and fall times of an output pulse produced by the unity gain amplifier.
摘要:
To eliminate or suppress amplifier noise in amplifiers (6, 7) connected to a semiconductor light sensor, for example of a charge coupled type, in which the noise introduced by the amplifiers has a frequency spectrum which is low with respect to the clock frequency of operation of the sensor, the minimum value signal from the light sensor, as amplified, is determined; the maximum value of the signal, as amplified, is determined; and a reference is derived based on the minimum value, for example by clamping the minimum value, or utilizing the minimum value as a dynamic reference for subtraction from the maximum value, to thereby eliminate the effect of low-frequency shift of signals due to low-frequency noise of the amplifiers; various circuits may be used, such as clamping circuits (FIG. 3), threshold or non-additive mixing circuits (FIGS. 4, 5) coupled to a subtraction stage (24), band-pass filtering and envelope demodulation (FIG. 6: 28, 29, 30) or synchronous demodulation (FIG. 7: 34, 35) using the scanning clock frequency (36, 37) for synchronous demodulation, coupled with frequency limiting the output to, for example, one-half clock frequency in a low-pass filter (39).
摘要:
For reduction of the relative noise amplitude a modulator or chopper stage is provided in front of the input of a video preamplifier and at the preamplifier output balanced demodulators are provided with a subtraction circuit combining their outputs. Preferably the carrier wave used for chopping or modulation is applied to the demodulators for synchronous demodulation, with a phase shifter if necessary in the carrier supplied to the demodulators for compensation of the signal propogation time through the preamplifier.