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At least 19 recordsLinked to original sources
PubMed1979

[Automatic adder mixer for photometric cells: application to superprecipitation of myosin B. (author's transl)].

An automatic adder mixer for photometric cells was newly developed in our laboratory and was applied in experiments of superprecipitation of myosin B. The mixer has a reciprocating blade-type impeller with a pit for loading samples. The pit was cut so as to be just above the meniscus of the solution in a cell at the top dead point of the cam mechanism and so as to enter the solution at the bottom dead point. When 10 microliter of methylene blue solution was added, the mixing time was 0.6 sec. Myosin B was extracted from rabbit white muscle. Adding ATP (1 mM) to myosin B suspension and mixing was carried out by hand, using a mixing plunger, and also using the automatic adder mixer. The recordings obtained were then compared. Continuous recording of the initial reaction was successfully obtained only when the automatic adder mixer was used. Excellent results were also obtained with respect to reproducibility. The automatic adder mixer is easy to make, inexpensive, and can be utilized in conjunction with conventional spectrophotometers.

Chemical Precipitation↗
PubMed1990

A low cost gas mixer.

A low cost gas mixer for permanent gases and volatile agents is described. The apparatus used the simple principle that if known volumes of gases are mixed at the same pressure and temperature, than a mixture of known composition results. The apparatus is shown to have an accuracy of better than +/- 0.08% vol/vol for gases and volatile agents in two and three part mixtures. For permanent gases the mixer could be used accurately over the concentration range 1-99% vol/vol. For volatile agents the mixer was suitable for mixing concentrations in the low percentage ranges (less than 5% vol/vol). Gas mixtures, including volatile agents, could be stored in the mixer for approximately 2 h without changes in concentration outside this limit of accuracy.

Anesthesiology↗
PubMed1991

Perfect-mixer retention function by analytical deconvolution of tracer histograms: application to evaluation of left-ventricular contractility and competence.

The analytical solution for the perfect-mixer retention function, r(t), was developed from tracer histograms sampled at the system input, i(t), and its output, y(t), linked by the convolution integral y = i * r. Theories were developed for both continuous-output mixer and pulsatile, discrete mixer. The latter method was applied in first-pass radioangiography (FPRA) to calculate the forward ejection fraction of the left ventricle (LVFEF). Curves generated over the lungs and the ventricle provided system input and output respectively. LVFEF correlated strongly with the reference values obtained with simultaneously acquired gated FPRA(LVGEF) in 32 non-regurgitant patients: LVGEF = 0.90LVFEF + 5.93, r = 0.96, SEE = 3.98, p less than 0.001. In 14 patients with left-side valvular incompetence LVFEF values (0.41 +/- 0.13) were consistently lower than the corresponding LVGEF values (0.63 +/- 0.11). The method is free from instability inherent in numerical deconvolution. Applied in FPRA it yielded accurate estimates of LV contractility and competence. The continuous-mixer theory may apply to arbitrary compartmental models studied via tracer kinetics.

Adolescent↗
PubMed1977

Oxygen transfer and axial dispersion in an aeration tower containing static mixers.

Oxygen transfer from gas to liquid under steady-state cocurrent flow conditions was modeled using the dispersion model, and the oxygen transfer coefficients were estimated from available data for a column with Koch motionless mixers. The dispersion in the column was estimated for several different gas and liquid flow rates using steady-state tracer experiments. The estimated oxygen transfer coefficients were compared with those estimated using complete mixing and plug flow models. The results indicate that the dispersion model is the most appropriate model for estimating the mass transfer coefficient from the available data.

Absorption↗
PubMed1992

Instrumentation of a high-shear mixer: evaluation and comparison of a new capacitive sensor, a watt meter, and a strain-gage torque sensor for wet granulation monitoring.

A high-shear mixer was instrumented with a new capacitive sensor, a watt meter, and a strain-gage torque sensor. The output from the capacitive sensor was split into two channels, which monitor both resistive and capacitive changes during the granulation process. The outputs of the devices were related to properties of the wet granulation. The percentage moisture content related linearly to the amplitude channel response. Yield values provided a rheological property to relate with power consumption and torque measurement. Power consumption and torque furnished a similar map of the granulation process. The amplitude channel of the capacitive sensor appears to be more clearly differentiated between binder levels in hydrous lactose-HPMC granulations than either power consumption or torque measurement, based on particle size distributions.

Chemistry, Pharmaceutical↗
PubMed1976

Performance and application of the Quantiflex air/oxygen mixer.

The Quantiflex air/oxygen mixer is designed to dispense mixtures of air and oxygen with separate controls for total gas flow rate and oxygen concentration of the mixture within the range 21-100%. A monitoring flowmeter is provided for the mixture and also, as a safety measure, for the oxygen component. This serves as an indicator that oxygen is flowing and also permits independent calculation of the oxygen concentration of the mixture. Delivered oxygen concentrations were found to be within +/- 2% of the indicated value at flow rates between 4 and 12 litre/min with the input pressures of either or both gases at 208-415 kPa (30-60 lbf/in2.) gauge, and with or without an output pressure of 20 kPa. At total flow rates of 1.5-2 litre/min there was a maximum discrepancy of 4% below and 8% above the indicated concentration in some delivered concentrations. Acceptability, ease, accuracy and quickness of use by nurses were compared with current methods using separate flowmeters for air and oxygen and calculating the required flow rates by means of arithmetic, graph and special-purpose slide-rule (Blease). The Quantiflex prototype was the most acceptable, the easiest, the most accurate and the fastest of the techniques investigated.

Evaluation Studies as Topic↗
PubMed1989

A computer-controlled anaesthetic gas mixer.

The theory and construction of a prototype computer-controlled gas mixer and flow regulator are described. The device is capable of controlling and mixing flows of oxygen, nitrous oxide and air. The accuracy and repeatability of the device is very high under given conditions, and its performance is quantified. The flow rate and oxygen concentration are selected from a microcomputer and the control program is written in BASIC. Possible improvements to the system are discussed as are uses in both clinical and research work.

Air↗
PubMedDate not supplied

[An amalgam mixer for dental work].

A stomatologic amalgam mixer with an automated dosage device ACD-02 is destined for measuring the powdered alloy of silver and mercury out, preparation of amalgams from the mentioned components or filling material "Gallodent-M" in conditions of stomatological polyclinics. Constant mixture of powder layers in the scale body reservoir and immediate measuring out the powdered alloy on switching on the electric drive are provided. The apparatus is completed by a cup with a forked holder and a special reusable capsule for manufacture of filling material "Gallodent-M".

Dental Amalgam↗
PubMed1979

Sample preparation of some shelled treenuts and peanuts in a vertical cutter-mixer for mycotoxin analysis.

A procedure has been devised for more rapid preparation of large samples of nutmeats (10-80 lb) for mycotoxin analysis without the use of grinding aids, by combining the grinding and mixing steps into one operation. Ease of cleaning equipment facilitates the preparation of several samples in a short time. The procedure was tested using shelled raw and roasted peanuts, and raw almonds, walnuts, and pecans. The reduction of particle size to pass a 20 mesh screen was attained using a 25 qt Hobart vertical cutter-mixer (VCM) equipped with standard serrated blades and a 40 qt VCM using either a standard serrated blade or a smooth-edge blade modified with sharp-edge notches to increase its cutting ability. Portions of ground composite were removed at various time intervals and particle sizes were measured. Original and check analyses of 12 naturally contaminated samples over a 3 year period indicate that this procedure is practical and reproducible.

Arachis↗
PubMedDate not supplied

[Stomatological amalgam mixer].

For preparing silver amalgam an amalgam mixer AC-01 has been constructed with a time relay. This is a table apparatus in whose body and oscillating movement mechanism with an electric drive and a time relay are arranged. Mixing the amalgam is done in capsules. The set is made up together with proportioners for mercury, powder and capsules for the preparation of the amalgam.

Dental Amalgam↗
PubMed1989

A stopped-flow mixer device for a batch microcalorimeter application to NAD-NADase reaction.

A new molded polypropylene, diamond-like carbon (DLC)-coated mixing cell has been developed for use in the batch microcalorimeter. Reagent volume can be varied from 25 microliters to 100 microliters. A 10 microcalorie reaction heat can be measured to 5%. Repeat reactions can be done as often as every 10 min for a fast reaction. Reactions can be started within 1 h or less after loading. A pre-equilibrator and a temperature-controlled syringe drive unit permit solutions to be stored at 4 degrees C while being run at any temperature from -20 degrees C to 40 degrees C. The kinetics and enthalpy of reaction of NAD-NADase have been measured. delta H is about 21 kcal/mol endothermic.

Calorimetry↗
PubMed1979

Measurement of the inactivation kinetics of poliovirus by ozone in a fast-flow mixer.

Inactivation kinetics of poliovirus type 1 in ozone demand-free water was investigated by utilizing a fast-flow mixing apparatus. Ozonated water and a solution of ozone demand-free water containing a known quantity of poliovirus type 1 were introduced simultaneously into a mixing chamber, both at a constant rate. This mixture was then passed through a narrow tube of known length and diameter into a neutralizing solution. By altering the rate of introduction and/or tube length, different contact periods between ozone and virus could be determined with an accuracy of 0.01 s. Inactivation of the poliovirus occurred in two steps. During the first step, which lasted for 0.2 to 1.0 s, 95 to 99% of the virus was inactivated, depending on the ozone concentration (which ranged from 0.1 to 2.0 mg/liter). The second step apparently continued for several minutes; in this period the remainder of the virus was inactivated. An obvious dose-response relationship was demonstrated during the first step of the inactivation curve. The pH of the water slightly affected the viral inactivation rate, but these small differences seem to have no practical value.

Buffers↗