Abstract: A method for determining the volume of a pipeline in a liquid chromatography system. The method comprises: inserting a detectable marker into a liquid flow of a liquid chromatograph; and by means of a time difference between a first moment at which a liquid chromatography detector detects the marker and a second moment at which a first sensor detects the marker, and a flow rate of the liquid flow, determining the total volume of pipelines between the liquid chromatography detector and the first sensor. By means of the method, a user can easily and flexibly determine the volume of a pipeline in a liquid chromatography system. In addition, further provided are a liquid chromatography system and a pipeline volume determination device.

Abstract: A method for determining the flow rate of a liquid flow in a liquid chromatography system. The liquid chromatography system sequentially comprises a fraction valve, a first sensor and a second sensor along a flow path direction, wherein a pipeline between the first sensor and the second sensor has a known inter-sensor pipeline volume. The method comprises: step A: emptying a pipeline between a liquid discharge port of the fraction valve and the first sensor; step B: guiding a liquid flow from a liquid discharge port of the fraction valve to pipelines at positions where the first sensor and the second sensor are located; and step C: determining the flow rate of the liquid flow on the basis of a time difference between a first moment when the first sensor detects a liquid-gas interface where the liquid flow interfaces with a gas and a second moment when the second sensor detects the liquid-gas interface, and an inter-sensor pipeline volume. Further provided is a fraction collector.

Abstract: The present invention relates to a Petri dish comprising a dish body which comprises a bottom wall and a side wall which extends along an outer circumference of the bottom wall, the bottom wall and the side wall of the dish body form an upper opening space adapted to accommodate cultures; a dish lid adapted to cover the upper opening space from above the dish body, the dish lid comprises a top wall and a side wall which extends along an outer circumference of the top wall, wherein the dish body and the dish lid are two independent members that are detachable, and the side wall of the dish body is formed on the outer side thereof with a ring for gripping that extends circumferentially, and the ring for gripping having an outer diameter larger than that of the dish lid. The Petri dish according to the present invention has a simple structure. Through the ring for gripping on the dish body, the user can easily hold the dish body without accidentally dislodging the dish lid or sliding it off the dish body.