Abstract: A recording apparatus includes a conveyance unit, a conveyance path, a double-sided conveyance path, and first and second charge eliminators. The conveyance unit conveys a recording medium having first and second surfaces in a first direction through the conveyance path to a recording area where recording is performed by a recording unit on the first surface. The recording medium then passes through the double-sided conveyance path before recording is performed on the second surface. The first charge eliminator eliminates charges from the first surface and is disposed at a position downstream of a junction between the conveyance path and the double-sided conveyance path in the first direction and upstream of the recording area in the first direction. The second charge eliminator eliminate charges from the second surface and is disposed downstream of the junction in the first direction and upstream of the recording area in the first direction.

Abstract: A recording apparatus includes a print head, a recovery unit, a type obtaining unit, a threshold obtaining unit, and a calculation unit. The print head forms an image by applying a recording material to a recording medium. The recovery unit performs a recovery operation for recovering an ejection state of the print head. The type obtaining unit obtains a type of the recording medium on which the image is to be recorded. The threshold obtaining unit obtains a threshold for performing the recovery operation corresponding to the obtained type of the recording medium. The calculation unit calculates a count-up value by adding, in response to recording on the recording medium, an addition value set for each of types of recording media. The recovery operation is performed in a case where the count-up value calculated by the calculation unit exceeds the threshold obtained by the threshold obtaining unit.

Abstract: A reagent composition comprising (a) liposomes encapsulating a marker therein, immobilizing a hapten on liposome membranes and having a size in the range of 100 to 500 nm in terms of mean particle size plus twice the standard derivation, and (b) an antibody to the hapten is effective for measuring human complement activity easily and precisely with excellent storage stability.

Abstract: A reagent composition comprising (a) liposomes encapsulating a marker therein, immobilizing a hapten on liposome membranes and having a size in the range of 100 to 500 nm in terms of mean particle size plus twice the standard derivation, and (b) an antibody to the hapten is effective for measuring human complement activity easily and precisely with excellent storage stability.

Abstract: Complement immunoassay using liposomes is improved by pretreatment of a sample solution before determination of analyte comprising acidifying or alkalinizing the sample solution, followed by changing the pH to about neutral so as to remove influences caused by interfering substances present in the sample.

Abstract: Membranes of liposomes fixing biotin on membrane surfaces thereof can be lysed by a mixed agent comprising a surfactant and avidin. This mechanism can be applied to immunoassay for determining an analyte, e.g. antigen or antibody, wherein liposomes encapsulating a marker and fixing biotin on membrane surfaces thereof are lysed depending on hindrance of an avidin-biotin binding reaction by a specific reaction caused by the analyte.

Abstract: A combination of reagents including (i) a first liquid containing (a) first microcapsules having an analyte immobilized on surfaces thereof and containing a marker therein and (b) microcapsules encapsulating an antibody and having different capsule walls from said first analyte immobilized microcapsules with respect to susceptibility to a capsule wall lysin, and (ii) a second liquid containing complement is suitable for immunoassay based on complement-dependent immune lysis of microcapsules.

Abstract: Urea derivatives of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently a 4-disubstituted aminoaryl group or the like, and R.sup.3 is a carboxyalkyl group or the like, is soluble in water and effective as a color producing reagent for determining hydrogen peroxide or the like or the activity of peroxidase.

Abstract: Urea derivatives of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently a 4-disubstituted aminoaryl group or the like, and R.sup.3 is a carboxyalkyl group or the like, is soluble in water and effective as a color producing reagent for determining hydrogen peroxide or the like or the activity of peroxidase.

Abstract: Novel functionallized liposomes containing a high-molecular-weight amphiphilic compound such as LPS etc. as one of matrix material have a very high encapsulation efficiency and readily undergo lysis. Moreover, antigen, antibody, etc. can be immobilized on the liposomes efficiently with a sufficient binding rate by using the amphiphilic compound as a spacer.