(n.) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.
Example Sentences:
(1) Broad half-band width (greater than 10 nm) photometers showed little deviation from linearity.
(2) Using the Perkin Elmer flame photometer sodium and potassium concentrations have been measured in muscle fibers from the m. ileofibularis of Rana temporaria.
(3) Using Scheimpflug photography (a modified SL 45 Topcon camera) instead of the transmission measurements of incubated lenses has the advantage that disorders in lens transparency can be exactly localized and the sensitivity is much higher than the photometer readings.
(4) The photometer was of a type commonly used for routine determination of a haemoglobin concentration in blood.
(5) Three simple photometers were tested for their suitability to determine concentrations of creatinine in small animal practice.
(6) An elution electrophoresis system in which a porous packed bed is used for separation and a flow photometer or colorimeter for continuous monitoring of the eluate may be capable of rapid, high-resolution analysis of serum proteins and other protein mixtures with very little manual labor.
(7) The system uses a Leitz MPV II scanning photometer, a PDP-8 computer with 24 k of core memory and a Tektronix 4010 graphic display terminal.
(8) Combination of the photometers with a "cuvette test" produced satisfactory results on comparison with a reliable reference method.
(9) These parameters were analyzed by using a reflection photometer (Reflotron).
(10) From 1968 to 1972 and in 1975 (provisional results) urine samples collected on three days per year were examined by photometer for N-acetyl-p-aminophenol (=NAPAP, main metabolite of phenacetin) and for salicylates in the same population.
(11) The effect of calcium on the biogenic amine level and distribution in the mouse brain was investigated by a histochemical method using a microscopic photometer (Pl, Nikon).
(12) Microphotometric measurements were performed at 565 nm by means of a computer-controlled microscope photometer.
(13) This program was written for a Wang 720 C programmable desk calculator associated to the Zeiss scanning photometer MP01.
(14) The available forms of Na2O and K2O were determined in the soil on a flame photometer.
(15) The assay is set up in microtitre plates, and following an uptake phase and removal of non-ingested erythrocytes, pseudoperoxidase activity is measured in detergent lysates of phagocytes, using an ELISA reader photometer.
(16) Quantitative parameters of the chromatin structure in the same nuclei measured in situ by a scanning microscope-photometer (step size 0.125 micron) before and after staining were equal.
(17) The assay result may also be read in a photometer, if the solution is first transferred to a transparent microtiter well.
(18) We evaluated eight blood glucose monitors (BGMs), from six manufacturers, that are lightweight, portable, battery-powered, relatively inexpensive handheld reflectance photometers that use test strips for self-monitoring of blood glucose levels.
(19) Evaluation was accomplished by comparing statistical morphometric and photometric data taken from digital images of FAMs generated by the microscope photometer.
(20) The amount of horse radish peroxidase labeled protein-A or anti-rat IgG bound to the antigen-antibody complexes is measured on the spectro photometer at wave length of 492 nm.
Spectrophotometer
Definition:
(n.) An instrument for measuring or comparing the intensites of the colors of the spectrum.
Example Sentences:
(1) Masticatory efficiency was measured by means of a spectrophotometer, using adenosine triphosphate (ATP) granules, the biting force and occlusal contact area.
(2) After an appropriate dilution, the released pyridine-2-thione which has a strong absorbance at 343 nm, is quantified by reading its absorbance in a spectrophotometer at 343 nm.
(3) This paper describes the properties and use of a fiber optic probe as an attachment to a spectrophotometer and its use for measurements in solutions and turbid suspensions.
(4) Cadmium and lead were determined in kidney and liver tissues of the sacrificed animals by using a trace metal analyzer and by atomic absorption spectrophotometer.
(5) The concentration-dependent association-dissociation equilibrium of the bifunctional enzyme aspartokinase I-homoserine dehydrogenase I of Escherichia coli K12 has been investigated at pH 7.6 in the presence of 10 mM L-threonine and 0.1 M KCl by equilibrium gel permeation monitored by a single-photon counting spectrophotometer.
(6) Carrier status is determined by scanning the autoradiographs with a densitometric spectrophotometer or by detection of a junction fragment.
(7) The absorbed and in the urine excreted 14C-activities are measured with a scintillation spectrophotometer and scintillator composed of 2,5-diphenyloxazole(POP), 1,4-bis-(4-methyl-5-phenyl-2-oxazolyl)benzene (dimethyl-POPOP), naphthalene, toluene and ethyleneglycol monomethylether.
(8) A spectrophotometer interfaced with a computer is used to plot the standard curve and calculate the protein content of each sample.
(9) The procedure developed enabled to use commonly employed spectrophotometers and to decrease distinctly the glutathione reductase consumption.
(10) Serum Al, Cu, Zn, Ni and Mn were measured with a flameless atomic absorption spectrophotometer.
(11) Capillary mean transit time was determined by detection of the passage of a hemodilution bolus through a region of the parietal cerebral cortical surface, using a reflectance spectrophotometer through a small craniotomy in chloral hydrate-anesthetized rats.
(12) Results obtained correlated well with those produced by our routine instrumentation (Beckman Astra, Varian atomic absorption spectrophotometer).
(13) Time-dependent changes in the ultraviolet absorbance of the adenine chromophore are observed in the stopped-flow spectrophotometer when adenosine and its analogs are rapidly transferred from protium oxide to deuterium oxide.
(14) The 412 nm complex must be present at appreciable concentrations when bacteriorhodopsin is exposed to high-energy argon ion laser light of the Raman spectrophotometer at room temperature.
(15) We have investigated the binding of fluorescein isothiocyanate (FITC)-labeled fibrinogen to platelets using a fluorescence spectrophotometer and a flow cytometer.
(16) The oxidation of reduced human ferroxidase by molecular O2 was studied in a stopped-flow spectrophotometer.
(17) The probe was calibrated for turbidimetric measurements with microorganisms by relating the apparent absorbancy measured on the spectrophotometer to the dry weight of each species of organism.
(18) An automated IR-spectrophotometer-mini-computer system was designed for assay of steroid hormone level.
(19) Then the stained cells were solubilized with 1% lauryl sulfate and the absorbance of each well was measured at 540 nm with a multiscan spectrophotometer.
(20) Difference spectra of the effect of HCo on the inhibition of cytochrome c oxidase by cyanida and azide in isolated intact mitochondria were recorded using a split beam spectrophotometer.