摘要:
The present invention aims to shorten an aspiration time, when aspirating a red blood cell component of a liquid sample having high viscosity. When aspirating the red blood cell component of a blood sample through a nozzle tip, a piston is pulled at its maximum to produce a maximum aspirating force, and starts aspiration. When a pressure in an aspirating system becomes equal to a predetermined value .alpha., the piston is returned to a position in which only a necessary aspiration volume of the liquid sample can be aspirated. Since the maximum aspirating force of the pump is utilized during the aspiration, the aspirating operation can be carried out more quickly.
摘要:
A pipetting apparatus is provided with clot detection. The pipetting apparatus comprises a nozzle for aspirating a sample. A pressure sensor is connected with the nozzle for measuring pressure in said nozzle. A plurality of pressure difference calculating circuits are operatively connected with the pressure sensor, each for inputting an output of said pressure sensor and obtaining a pressure difference at a different pressure calculation period, respectively. A plurality of discriminating circuits each having a different discrimination threshold value determined according to each of the pressure calculation periods are provided. An alarm circuit is included for outputting a clot detection alarm signal when at least one of said discriminating circuits discriminates that the obtained pressure difference exceeds the discrimination threshold value.
摘要:
In pipetting a blood plasma component and a red blood cell component separated vertically in a blood sample by a centrifugation, the red blood cell component having a high viscosity is aspirated as quickly as possible. A nozzle 32 is composed of a nozzle base 35 and a disposable tip 36, and is transferred upwardly and downwardly and to the right and left by an XYZ robot 34. At first the blood plasma component in the blood sample put in a test tube 62 is pipetted by a nozzle 32, and then an inner wall of the disposable tip 36 is coated with the blood plasma component, and thereafter the red blood component is pipetted.
摘要:
The presence of air bubbles is detected during a dispensing of samples for determining if the volume of the sample dispensed is insufficient.The characteristic of a presence-of-bubbles curve (101) has a difference in a pressure inside a nozzle from the characteristic of a curve (100) under a normal condition in which no bubbles exist, at the time just before the dispensing of the sample is completed. Accordingly, it is possible to determine whether or not bubbles exist by detecting the pressure inside the nozzle at the determination time (105) and comparing the detected value with an established threshold value, and it is determined that an insufficient volume of sample has been dispensed, thereby a warning is generated.
摘要:
Embodiments described herein provide a pipetting apparatus with leak detection and a method for detecting a leak. In one embodiment, an automatic pipetting apparatus comprises a nozzle having a lower end portion through which a fluid sample is aspirated and dispensed by changes in air pressure supplied to the nozzle. A piping system operatively connects the nozzle to a pump for supplying the air pressure to the nozzle. A pressure sensor is operatively connected with the piping system for measuring internal pressure in the piping system. An XYZ robot is operatively connected with the nozzle for three-dimensionally moving the nozzle between an aspirating position of the fluid sample and a dispensing position. A leak detector is operatively connected with the pressure sensor for detecting a leak in the piping system based upon a measured result obtained by measuring the internal pressure in the piping system with the pressure sensor while the nozzle, which has aspirated a predetermined volume of the fluid sample, is being moved between the aspirating position and the dispensing position by the robot.
摘要:
Novel guanidinothiazole compounds of the general formula ##STR1## wherein R represents a hydrogen atom or a lower alkyl group, Y represents a sulfur atom or a methylene group, m and n each represents an integer of 1-3, A represents the group shown by ##STR2## (wherein R.sub.1 represents a hydrogen atom, a cyano group, a carbamoyl group, a ureido group, a hydroxyl group, a lower alkoxy group, a lower acyl group, an acylamino group, an arylsulfamoyl group, an aralkyl group or a carboxymethyl group, an arylsulfamoyl group, an aralkyl group or a carboxymethyl group, R.sub.2 represents a hydrogen atom, a lower alkyl group, a lower alkenyl group, a lower alkynyl group, a cyano group or a lower acyl group, and R.sub.3 represents a hydrogen atom, a lower alkyl group, a hydroxyl group or a sulfamoyl group), and the pharmacologically acceptable acid addition salts thereof; these compounds are useful as gastric acid secretion inhibitors.
摘要:
In a Fourier transform nuclear magnetic resonance spectrometer, as is known, a pulse modulated radio frequency is applied to a sample placed in a magnetic field, and a free induction decay signal resulting from the above application is Fourier transformed to obtain a nuclear magnetic resonance spectrum. In such a spectrometer, a material having a predetermined resonance peak, for example, tetramethylsilane is used as a reference sample, and the center frequency of the pulse modulated radio frequency is successively varied while maintaining a constant magnetic field intensity. The position of peak of tetramethylsilane in frequency spectra thus obtained is varied with the change of the center frequency. By measuring successively the signal strength of the peak, there can be obtained a frequency characteristic of a receiving system employed in the spectrometer, which is used to obtain correction coefficients of the receiving system. By multiplying a frequency spectrum of a sample to be analyzed by the correction coefficients, the frequency characteristic of the receiving system is corrected, and thus the signal strength of the frequency spectrum can be indicated with high accuracy.
摘要:
Pyrazine derivatives by the formula ##STR1## are disclosed. In the above formula, R.sup.1 and R.sup.2, which may be the same or different, each represents a hydrogen atom, a halogen atom, a hydroxy group, a lower alkoxy group, a phenyl lower alkoxy group, a phenoxy group, a mercapto group, a lower alkylthio group, a phenyl lower alkylthio group, a phenylthio group, an amino group, a substituted amino group, a lower alkyl group, a carbamoyl group or a sulfamoyl group; R.sup.3 represents a lower alkoxy group; R.sup.4, R.sup.5, and R.sup.6, which may be the same or different, each represents a hydrogen atom, a lower alkyl group, a cycloalkyl group, a phenyl lower alkyl group, or a phenyl group; and A represents a lower alkylene group; said R.sup.4 and A, said R.sup.5 and A, said R.sup.4 and R.sup.5, or said R.sup.5 and R.sup.6 may form a 5-membered or 6-membered nitrogen-containing heterocyclic ring which may further contain a hetero-atom together with nitrogen atom, and the pharmacologically acceptable non-toxic salts thereof. The compounds of this invention have a strong and selective antiematic activity and an effect of stimulating the gastric motility.
摘要:
Novel heterocyclic compounds shown by the formula ##STR1## wherein Het represents a 5-membered or 6-membered heterocyclic group which may have substituent(s); Z represents a sulfur atom or oxygen atom; X represents an oxygen atom or the unsubstituted or substituted imino group shown by N--R.sub.1 (wherein R.sub.1 is a hydrogen atom, a lower alkyl group, a cyano group, an unsubstituted or alkyl substituted carbamoyl group, an unsubstituted or lower alkyl substituted thiocarbamoyl group, or a lower alkanoylamino group); Y represents a hydrogen atom, a lower alkyl group which may have substituent(s), a cycloalkyl group of 3-6 carbon atoms, a lower alkenyl group, a lower alkynyl group, an aryl group which may have substituent(s), an aralkyl group which may have substituent(s), a hydroxyl group, a cyano group, a carbamoyl group, an amidino group, an alkanoyl group which may have been substituted by halogen atom(s),an alkanoylamino group, an arylcarbonylamino group, an alkylamino group, an arylamino group, an arylsulfamoyl group, a lower alkoxycarbamoyl group, or an oxamoylamino group; and m and n represent an integer of 1-3; when X is N-R.sub.1, said X and Y may combine with each other to form a 5-membered or 6-membered heterocyclic ring containing 2-3 nitrogen atoms which may have substituent(s), and the pharmaceutically acceptable acid addition salts thereof.The compounds of this invention are useful as gastric acid secretion inhibitors.