573 results about "Photometer" patented technology

The invention relates to the technical field of total phosphorus detection, in particular to a method for determining total phosphorus in water, which comprises the following steps: 1) digestion treatment: adding an oxidant into a water sample to be detected, and then performing microwave digestion treatment to obtain digested water; a molybdate reagent is added into the digested water, then an improved ascorbic acid solution is added, a chromogenic reaction is completed at the set temperature, and the improved ascorbic acid solution is obtained by mixing an ascorbic acid solution and sodium ethylene diamine tetracetate; measuring the concentration: measuring the absorbance value of the obtained color development product by using a spectrophotometer and a long-optical-path cuvette; and drawing a standard curve: using a phosphorus standard solution as a quality control sample, adding a plurality of calibration points in a low-concentration interval of 0.0-0.1 mg / L, carrying out colorimetric determination, and establishing quadratic equation fitting according to absorbance and concentration so as to determine the total phosphorus content of the water sample to be detected, and the method has the advantages of high sensitivity and good accuracy in total phosphorus testing.

The invention relates to the field of betacyanin content detection, and discloses a method for rapidly detecting betacyanin content based on spectrophotometry, which comprises the following steps: experimental operation: preparing samples into standard solutions with different concentrations, carrying out full-spectrum scanning on the standard solutions by using a spectrophotometer, and determining the content of betacyanin by using a spectrophotometer; recording absorbance values under different wavelengths to form a spectral data matrix; preprocessing: preprocessing the spectral data matrix to obtain basic data; first analysis: analyzing the basic data by adopting a multivariate correction technology so as to obtain first data; and second analysis: analyzing the basic data by adopting a spectral feature extraction and mode recognition technology. A complete detection process is formed from data acquisition, preprocessing and analysis of different technologies to final fusion and integration, each step provides better data or more accurate analysis results for subsequent steps, and rapid and accurate detection of the betacyanin content is jointly realized.

The invention relates to a method for efficiently and accurately measuring the content of a urease inhibitor in a stabilized fertilizer. The method comprises the following steps: preparing a sample solution; carrying out digestion treatment on the sample solution; carrying out chromogenic reaction; measuring the absorbance of the blue complex by using a 3cm cuvette under the wavelength of 710 nanometers by using a spectrophotometer; and calculating the content of the total effective components of the urease inhibitor in the sample according to a relational expression between the phosphorus content and the absorbance. According to the invention, accurate measurement of the content of the target component can be realized through chemical digestion, chromogenic reaction and photometric analysis, the measurement method is simple and reliable, the measurement method shows significant advantages in the aspect of urease inhibitor content measurement, and powerful technical support can be provided for quality control and performance evaluation of related products. Compared with the existing liquid chromatography, the method has the advantages that the cost advantage is obvious, the acquisition cost and the maintenance cost of a liquid chromatograph and matched equipment thereof can be saved, accurate determination can be carried out only by using a conventional detection appliance, and the method has good universality.

A self-calibrating hybrid spectrophotometer comprises a receptacle for receiving the cuvette, first and second optodes that are configured to permit light to enter the cuvette, third and fourth optodes that are configured to permit light to leave the cuvette, and a controller that is configured to control delivery of light to one of the first and second optodes. Light entering one of the first and second optodes is received at the third and fourth optodes after having interacted with the turbid sample along different paths having different lengths. Measurements made at the third and fourth optodes in response to having illuminated both the first and second source optodes provide two slopes of optical transmittance as a function of path length. The spectrophotometer uses these slopes to identify a slope that is indicative of the absorption coefficient and the reduced scattering coefficient of the sample.

The invention discloses an Airy beam attenuation compensation method based on a neutral density filter and an imaging system, and belongs to the technical field of microscopic imaging, the method comprises the following steps: shaping and filtering a light beam emitted by a light source through a shaping device, and then generating an Airy beam; light beams pass through a neutral density optical filter, and attenuation compensation of different degrees is achieved on the light beams at different positions on a light beam propagation transverse plane; enabling the light beam to pass through a scanning galvanometer to form a light sheet, enabling the light beam to enter from one side of the sample, and exciting the sample to generate a fluorescence signal; the sample is imaged, an imaging result is collected through a camera, and the light intensity change in the exciting light propagation process is analyzed; and measuring an attenuation coefficient by adopting a biological spectrophotometer, and determining parameters of the neutral density filter. According to the attenuation compensation method, the advantages of Airy beams are combined, and a new optical element (neutral density filter) is introduced to achieve the purpose of attenuation compensation.

The invention discloses a ground photometer aerosol parameter inversion algorithm based on integrated machine learning. According to the method, a training data set for training an integrated machine learning model is obtained by adopting a forward radiation transmission simulation model, and the training data set is independent of an aerosol product of an existing algorithm and observation interfered by noise; the algorithm has good generalization ability and is excellent in performance after being used for real observation of a photometer, and inverted aerosol parameters have the ability of representing aerosol types; an aerosol inversion algorithm based on an integrated machine learning model is developed aiming at observation of a ground photometer, and the time for completing aerosol inversion for one time is at a millisecond level; the multi-band and multi-angle radiance observation can be utilized at the same time to invert aerosol parameters of multiple bands at a time; any prior hypothesis and smooth constraint are not needed during aerosol parameter inversion, inversion result loss caused by non-convergence of gradient descent in a numerical inversion algorithm is avoided to a certain extent, and waste of effective observation is reduced.

The invention provides a detection device for a density gradient centrifugal sample, and belongs to the technical field of detection devices. The device comprises a sample suction platform mechanism which is used for sucking layered samples to be detected in a centrifugal tube layer by layer and conveying the layered samples to a sample detection chamber of an optical detector mechanism; the optical detector mechanism is provided with a xenon lamp light source and a beam shrinking light path system and supports 200-1100 nm full-wavelength detection; and the automatic collecting platform mechanism is used for sub-packaging the samples detected by the optical detector mechanism. According to the invention, a separation system and a collection system are integrated into a continuous process, so that man-made interference is reduced, and the resolution ratio and efficiency are improved. The xenon lamp light source and the beam shrinking light path system are adopted, the detection precision and stability are improved based on the spectrophotometer principle, the detection wavelength can be freely selected, and the limitation of traditional dual wavelengths is broken through.

The invention discloses a method for detecting the purity of a phosphorus-containing flame retardant, and belongs to the technical field of flame retardant detection. The specific test method comprises the test steps of selecting a solvent, preparing a to-be-tested solution, determining the maximum absorption wavelength, determining absorbance, calculating the purity of a sample and the like, and analyzing and processing an experimental result. The solvent is filtered through a 600-mesh screen, the influence of impurities in the solvent on an experimental result is eliminated, and the scientificity of the experimental result is ensured by parallelly determining the average value recorded for three times; the testing method has the advantages of low cost, simplicity and convenience in operation, short detection period and the like, and can realize rapid detection of a plurality of samples based on multiple stations of an ultraviolet-spectrophotometer, so that the working efficiency is improved; meanwhile, the method for detecting the purity of the phosphorus-containing flame retardant provided by the invention can be used for comparing the quality of products from different manufacturers and the batch stability of the products at the same time, and is beneficial for enterprises to control the quality of the products.

A photometric process measurement arrangement and a photometric measurement method The invention refers to a photometric process measurement arrangement (10) comprising a photometric immersion probe (20) comprising a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising a separate wavelength-selective detection element (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70), The photometer control (80) comprises: An impulse signal integrator (819, 829, 839) for integrating the electric impulses having the impulse intensity (Ui) generated by the detection element (71, 72, 73) of one impulse integration cycle (204; 221; 264), a measurement cycle control (90) for adapting the total number of 20 integrated cycle impulses of an impulse integration cycle (204;221;264) to the impulse intensity (Ui) of the single electric impulses, an A / D-converter (81, 82, 83) for converting the voltage of the impulse signal integrator (819, 829, 839) in an optional compulsory A / D conversion interval (100) after the impulse integration cycle (204;221;264), and an A / D-conversion management module (150) for balancing the total number of A / D conversion intervals (100-111) within a time frame (F), whereas the number of supplementary A / D conversion intervals (101-111) after the compulsory A / D conversion interval (100) depends on the length of the corresponding impulse integration cycle (204; 221; 264).

The invention relates to the technical field of liquid crystal panel defect detection, and particularly discloses a liquid crystal panel brightness non-uniform defect detection method and system, an image of a liquid crystal panel in a display mode is obtained by using a photometer, brightness information is captured through a high-precision sensor, and the brightness non-uniform defect of the liquid crystal panel is obtained by using an image segmentation algorithm. In combination with adaptive threshold segmentation, deep learning semantic segmentation and a region growing algorithm, regions with uneven brightness problems are accurately identified and extracted, brightness difference degrees, spatial distribution and time stability are analyzed respectively, corresponding feature indexes are calculated, the feature indexes are integrated, and the brightness difference degree, the spatial distribution and the time stability are calculated. The comprehensive score of each region with uneven brightness is generated through standardized calculation, the regions are divided into slight, medium and serious defects, the method is combined with real-time monitoring, the detection time and parameter setting can be dynamically adjusted, intelligent detection is carried out for different types of uneven brightness defects, the detection efficiency and precision are optimized, and redundant detection is avoided.

An embodiment of a spectrophotometric device for measuring blood oxygen saturation includes a light source, a detector for detecting a light signal reflected by a subject's tissue, an electronic data processing unit to calculate blood oxygen saturation based on the light signal, and a motion sensor for detecting a motion signal indicative of motion of the light source and / or the light detector. The electronic data processing unit may discard a light signal measured by the detector if the motion signal detected by the motion sensor exceeds a predetermined threshold value. An embodiment of a method for measuring blood oxygen saturation includes emitting a light signal into a subject's tissue, detecting the light signal reflected by the tissue, calculating blood oxygen saturation using the light signal measured by the detector, and detecting a contact signal indicative of contact between a subject's skin and the light source and / or the detector.

The invention relates to a diatomic catalyst for detecting carbosulfan pesticide residue and a preparation method, and belongs to the technical field of food safety detection. According to the invention, a reducing sulfide generated by breaking a nitrogen-sulfur (N-S) bond of carbosulfan under an acidic condition is used as a specific substance. The reductive sulfide not only can prevent bimetal active sites in the diatomic catalyst, but also consumes hydroxyl radicals generated by catalyzing hydrogen peroxide (H2O2), and the sensing switch enzyme formed by a dual enzyme inhibition mechanism causes the enzyme substrate 3, 4-dihydroxyl-3, 4-dione to be converted into the diatomic catalyst, so that the catalytic activity of the diatomic catalyst is improved. The blue color of the 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) gradually becomes light along with the increase of the concentration of carbosulfan, sensitive visual detection is implemented, and after a blue product is read by using an ultraviolet spectrophotometer, the absorbance value generated by an ultraviolet absorption spectrum at 654 nm is linearly dependent on carbosulfan. The prepared diatomic catalyst effectively improves the detection sensitivity of the carbosulfan pesticide residue, and has good popularization and application prospects.

The invention refers to a photometric process measurement arrangement (10) with a photometric immersion probe (20). The photometric immersion probe (20) comprises a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising at least two separate wavelength-selective detection elements (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70). The photometer control (80) comprises several impulse signal integrators (819, 829, 839) for integrating the electric impulses generated by the detection elements (71, 72, 73), several A / D-converters (81, 82, 83) for converting the voltages of the impulse signal integrators (819, 829, 839) when high-precision-converting trigger ports (H) of the A / D-converters (81, 82, 83) are triggered, and a measuring cycle control (90) with an integration target memory (94) memorizing an integration target voltage value (Ut). The photometer control (80) is provided with a high-precision-request port (93) for synchronously triggering the high-precision-converting trigger ports (H) of all A / D-converters (81, 82, 83) after the voltage of the first of all impulse signal integrators (819, 829, 839) has exceeded the memorized integration target voltage value (Ut).

The invention provides pathological tissue section dyeing equipment and method. The method comprises the following steps: dividing a to-be-dyed lymphatic tissue section into a plurality of dyeing partitions according to the structural characteristics of lymphocyte tissues in the to-be-dyed lymphatic tissue section; dyeing agents with different concentrations are applied to different dyeing partitions according to the reference light transmittance of the lymphocyte tissue to obtain color gradient vectors of the lymphocyte tissue slices, light absorption characteristics of the dyeing partitions are measured through a photometer, and dyeing characteristics are determined based on the light absorption characteristics and the color gradient vectors; obtaining a dyeing image after dyeing the lymph tissue section, extracting deep features of the dyeing partitions from the dyeing image, and determining a dyeing loss value when dyeing the dyeing partitions based on the deep features and the dyeing features; and based on the dyeing loss value, carrying out self-adaptive adjustment on the dyeing agent concentration of each dyeing zone. By adopting the scheme provided by the invention, optimal adjustment on the concentration of the coloring agent in the sample dyeing process can be realized based on the characteristic difference of the cell tissues at different parts.

The invention relates to a method for identifying soapberry from soapberry peel based on ultraviolet-visible spectrophotometry. The method is characterized by comprising the following steps: preparing a saponin solution, adding a 5% vanillin-glacial acetic acid solution and perchloric acid, uniformly shaking, heating in a constant-temperature water bath kettle at 70 DEG C for 15 minutes, cooling in an ice-water bath for 3 minutes, adding 5mL glacial acetic acid as a solvent, and measuring the characteristic absorption spectra of the vanillin and the glacial acetic acid by adopting an ultraviolet and visible spectrophotometer. And by utilizing the obvious difference of the number, the peak pattern and the position of the characteristic peaks in the absorption spectrum, the simple and rapid identification of the two is realized. The method has the advantages that the mass of required raw materials is small, the operation is simple, the process flow is short, and the experimental conditions are easy to realize. The technology is a rapid and efficient method for identifying and identifying the pericarp, pericarp powder and pericarp extract of the Sapindus maxima and the Sapindus mukorossi.

The invention relates to the technical field of light control, and discloses a light control method and device based on environment self-adaption and a storage medium, and the method comprises the steps: obtaining a color temperature value of a light source, a chromatic value of the light source, environment brightness, a sampling moment and original light brightness; performing luminosity calculation according to the color temperature value, the chromatic value and the ambient brightness to obtain light intensity; carrying out brightness difference calculation according to the environment brightness and the sampling time to obtain a brightness change difference value; performing difference index calculation according to the brightness change difference value to obtain a brightness difference index value; performing intensity judgment according to the light intensity and the brightness difference index value to obtain an environment change degree value; according to the brightness change difference value and the environment change degree value, carrying out comfort calculation to obtain a light comfort value; and performing brightness comparison according to the original light brightness and the light comfort value to obtain an optimal light brightness adjustment value, and adjusting the light brightness according to the optimal light brightness adjustment value. The method can adjust the light state in time according to the change of the environment.

The invention relates to the technical field of photovoltaic film detection, in particular to photovoltaic film performance detection equipment which comprises a spectrophotometer with an integrating sphere accessory, the integrating sphere accessory is mounted in a sample bin of the spectrophotometer, and a mounting mechanism and a wrinkle generator are further mounted in the sample bin. The wrinkle generator comprises a jacking head for applying local mechanical pressure to the photovoltaic film and an L-shaped jacking rod for applying non-uniform mechanical tension, the wrinkle generator further comprises a transmission part, and the jacking head and the L-shaped jacking rod alternately extend out in the front-back direction under the transmission action of the transmission part so that different wrinkles can be generated on the surface of the photovoltaic film; the light transmittance of the photovoltaic film with different inclination degrees and different wrinkle conditions is detected through the spectrophotometer with the integrating sphere accessory, the method is more suitable for the actual use state of the photovoltaic film, the detection result is more accurate, and more reliable basis is provided for performance evaluation of the photovoltaic film.

The invention discloses an organic-inorganic hybrid zero-dimensional halide perovskite single crystal material and a preparation method thereof. The chemical formula of the organic-inorganic hybrid zero-dimensional halide perovskite single crystal material is PMA4InCl7.H2O, and the chemical formula of the antimony-doped single crystal material is PMA4InCl7.H2O: Sb, the corresponding single crystal material is obtained through the steps of raw material adding, cooling crystallization, suction filtration, drying and the like. The optical band gap of the PMA4InCl7. H2O is determined to be 4-5 eV through an ultraviolet-visible spectrophotometer, and when the PMA4InCl7. H2O is irradiated by a 365 nm portable ultraviolet lamp, the PMA4InCl7. H2O shows light blue; the optical band gap of the PMA4InCl7. H2O: Sb is determined to be 3-4 eV through an ultraviolet-visible spectrophotometer, and when the PMA4InCl7. H2O: Sb is irradiated by a 365 nm portable ultraviolet lamp, the PMA4InCl7. H2O: Sb shows bright yellow. The maximum quantum yield measured by an absolute fluorescence quantum yield spectrometer can reach 72%.

An UPLC can offer the advantages of improved resolution, shorter analysis time, reduced solvent consumption, and easy connectivity to a mass spectrometer. One of our unique approaches is to use four small linear pumps to achieve gradient elution. We use four binary pumps to achieve continuous gradient elution. We designed an on-line degassing to greatly reduce interference from gas bubbles, thereby maintaining stable pressure. The range of flow speed is controlled from 300 nl / min to 100 ul / min. This portable UPLC can withstand pressures of 15,000 psi or higher. Its size is 30 cm×30 cm×30 cm, and it weighs less than 20 kg. This portable UPLC is equipped with an LED detector, which reduces both cost and system size and has higher sensitivity than a spectrophotometer. We also have the option to easily switch to a conventional detector with a discharge light source and a grating spectrophotometer.

A calculation module for determining a localization, system, eyewear and computer implemented method. The calculation module is configured to receive, from a spectrophotometer of an optical device, data representing a power density of at least two spectral components of a light received by the spectrophotometer and to determine the localization using the power density of the at least two spectral components.

The invention relates to the technical field of photometer detection, in particular to an ultraviolet and visible spectrophotometer and a detection method thereof.The method comprises the steps that reference calibration and blank calibration are sequentially conducted on the ultraviolet and visible spectrophotometer, a to-be-detected sample is placed in a sample chamber of the ultraviolet and visible spectrophotometer, and the ultraviolet and visible spectrophotometer is obtained; turning on a light source to measure the to-be-measured sample, and recording the absorbance value of the to-be-measured sample; drawing an absorbance spectrogram of the to-be-detected sample in the ultraviolet and visible spectrophotometer, and calculating the concentration of the to-be-detected sample according to the standard curve; determining the detection accuracy of the ultraviolet and visible spectrophotometer based on the stray light ratio in the detection process; if the detection accuracy does not meet the requirement, adjusting the light source wavelength of an ultraviolet and visible spectrophotometer; and if the measurement reliability does not meet the requirement, adjusting the size of the diaphragm of the ultraviolet and visible spectrophotometer. According to the invention, the detection accuracy of the ultraviolet and visible spectrophotometer is improved.

The present disclosure relates to a chemiluminescence analyzer, comprising: a sample preparation device configured to pre-dilute a blood sample under test by using a diluent, and mix the pre-diluted blood sample under test and a reaction reagent in a reaction vessel to obtain a sample liquid under test; a substrate providing device configured to provide a luminescent substrate into the reaction vessel containing the sample liquid under test so as to carry out a chemiluminescence reaction; a photometric device, at least comprising a photometer; and a data processing device configured to obtain a test result of human chorionic gonadotropin (HCG) in the blood sample under test on the basis of a luminescent signal and a preset calibration model. A first linear test range of the photometer is [A1, A2] photon count / second, and in the first linear test range, the intensity of the luminescent signal generated in the chemiluminescence reaction is linearly related to the photon count output by the photometer, wherein A1 is less than or equal to 2000 and A2 is greater than or equal to 108. Therefore, the testing efficiency and accuracy of HCG can be improved without increasing the costs.

The utility model discloses a stable detection structure of an ultramicro spectrophotometer, which comprises a fixed plate, the bottom of the fixed plate is fixedly connected with a motor fixing seat and a support plate, and a rotating plate is hinged above the fixed plate; a second optical fiber is installed in the rotating plate, optical fiber heads at the two ends of the second optical fiber correspond to optical fiber heads of the first optical fiber and the third optical fiber in the vertical direction, the second optical fiber is fixedly connected into the fixing plate, and the third optical fiber is fixed to the transmission block. Linear sliding grooves are formed in the left side and the right side of the transmission block correspondingly, adjusting blocks are installed in the linear sliding grooves, and light barriers are installed on the opposite outer sides of the two adjusting blocks correspondingly. Photoelectric switches corresponding to the light barriers are installed on the front side and the rear side of the motor fixing base. According to the stable detection structure of the ultramicro spectrophotometer provided by the utility model, the position of the light barrier can be accurately adjusted, accurate positioning of ultramicro measurement is realized, and the problem that an optical fiber head is easy to collide can be solved.

The invention relates to the technical field of lithium ion batteries, in particular to a method for measuring the concentration of free iron ions in lithium ion battery electrolyte. According to the invention, tannic acid is used as a detection reagent, the tannic acid and free iron ions form a stable complex, and the tannic acid has maximum absorption at 512nm under an ultraviolet-visible absorption spectrum. According to the method, the concentration of the free iron ions in the lithium ion battery electrolyte can be measured by utilizing the ultraviolet and visible spectrophotometer, the method is simple, efficient, low in cost and good in reproducibility, the relative error between the concentration of the free iron ions and the concentration of the free iron ions obtained by inductively coupled plasma-mass spectrometry does not exceed 6%, and the method is suitable for production of a lithium ion battery production line.

Provided is a phosphor powder in which the balance of suitability, brightness, and excitation light blocking properties of a complex obtained from the phosphor powder with respect to a small-sized light-emitting device is improved. A phosphor powder containing SCASN phosphor particles, the phosphor powder having a volume-based median diameter (D50) of 0.1 [mu] m to 5.0 [mu] m (inclusive) as determined by a laser diffraction scattering method, and a peak wavelength of a fluorescence spectrum measured by a spectrophotometer when the phosphor powder is irradiated with light having a wavelength of 455 nm of 590.0 nm to 630.0 nm (inclusive), the absorption rate when the phosphor powder is irradiated with light having a wavelength of 455 nm is 80.0% or more.

The invention discloses an energy-saving solar photovoltaic panel applied to an exterior facade curtain wall, and belongs to the technical field of solar panels, the energy-saving solar photovoltaic panel applied to the exterior facade curtain wall comprises a backboard frame, and the interior of the backboard frame is rotatably connected with a solar cell panel through a bearing and a rotating shaft. The micro motor is mounted on the inner wall of the left end of the back plate frame, so that the strong light angle of sunlight can be monitored in real time through the photometer, and the micro motor is matched to drive the solar cell panel to perform adaptive adjustment according to the strong light angle, so that the solar cell panel fully absorbs the sunlight; meanwhile, the plano-convex lens can refract light parallel to the surface of the tempered glass and irradiate the light to the solar cell panel, solar energy flow dispersion is reduced, the solar cell panel can make full use of solar energy in the working time, and therefore normal and effective power generation efficiency of the solar panel is guaranteed, time waste and energy consumption are reduced, and the service life of the solar cell panel is prolonged. And the energy-saving effect is enhanced.

The embodiment of the invention provides a preparation method of octahedral Ag2O nano-enzyme and a method for detecting H2O2 through a colorimetric method, and relates to the technical field of H2O2 detection. The method for detecting H2O2 by using the colorimetric method comprises the following steps: step S11, taking a plurality of centrifugal tubes, adding quantitative Ag2O solution and H2O2 with different concentrations into each centrifugal tube, and uniformly mixing; step S12, adding a NaAc-Hac buffer solution and a TMB (Tetramethylbenzidine) solution into each centrifugal tube treated in the step S11 to form an Ag2O-TMB-H2O2 reaction system, heating the Ag2O-TMB-H2O2 reaction system in each centrifugal tube in a water bath for a preset time, and observing the color change of the solution in each centrifugal tube; and step S13, determining a light absorption value of the Ag2O-TMB-H2O2 reaction system at a preset wavelength through an ultraviolet photometer, and recording data. The method for detecting H2O2 through the colorimetric method has the advantages of being simple in operation process, accurate in detection, visual in result and the like.

The utility model relates to the technical field of photometers, and in particular to an instantaneous digital photometer, comprising a photometer body, a side wall of the photometer body being connected to a storage assembly, the storage assembly being provided with an installation cavity, the installation cavity being provided with an open end at the bottom end away from the storage assembly, a dust cover being provided in the installation cavity, one end of the dust cover being connected to a limit rod, and the limit rod being plugged into the open end. The utility model aims to protect the instantaneous digital photometer more efficiently and stably.

To provide a molecule capable of recognizing a cytosine-cytosine mismatch in DNA.SOLUTION: A solution of FcDANP represented by the chemical formula below, and three solutions each obtained by mixing FcDANP with one of three DNAs having different base sequences, are measured using an ultraviolet-visible spectrophotometer. In the wavelength range of approximately 375-400 nm, the sample containing FcDANP and the DNA having a C-C mismatch exhibits a significantly higher absorption intensity than the other samples.SELECTED DRAWING: Figure 1

The rotary knob mist adjusting nozzle comprises a nozzle assembly which is provided with a spraying opening for spraying atomized liquid and further comprises a blocking needle capable of axially moving in the spraying opening; the absolute value encoder is coaxially arranged on the periphery of the nozzle assembly in a sleeving mode, and the rotation angle of the absolute value encoder around the axis of the absolute value encoder is electrically associated with the axial movement of the plugging needle; and the knob assembly is used for finger contact, the knob assembly and the nozzle assembly are coaxially assembled, and the knob assembly drives the absolute value encoder to rotate around the axis of the absolute value encoder. In this way, the absolute value encoder coaxial with the nozzle enables the structure to be more compact, and adjustment operation can be conveniently conducted through the rotary knob.