Abstract: The invention relates to a method and reagent mixture for the staining and thus visualization of amino acids, peptides and similar compounds, in particular after separation by means of thin-layer chromatography. The staining is carried out using ninhydrin for the detection of amino acids, peptides or proteins in combination with at least one ionic liquid.

Abstract: The invention relates to a method and reagent mixture for the staining and thus visualisation of amino acids, peptides and similar compounds, in particular after separation by means of thin-layer chromatography. The staining is carried out using NIN-HYDRIN for the detection of amino acids, peptides or proteins in combination with at least one ionic liquid.

Abstract: The invention relates to a method for the bioautographic detection of fungicides, in which a developed thin-layer chromatography plate is incubated with a fungal suspension, and zones of inhibition which arise are detected during the fungal growth by fluorescence extinction or by means of optical brighteners.

Abstract: Novel separation materials for thin layer chromatography are disclosed; these consist of a support and a separation medium layer and are obtainable by the following process steps: a) cleaning of the support; b) application of a liquid film comprising a polysilicic ester to a support; c) introduction of the support with the liquid film into an atmosphere which effects hydrolysis and further polymerization of the polysilicic ester; d) hydrolysis and further polymerization of the polysilicic ester at constant temperature; e) washing of the silica layer; f) drying of the silica layer. The silica gel surface of the separation material of the invention can be modified by means of separation effectors.

Abstract: A flow and pressure control valve for injecting a fluid into a well, or for pumping the fluid out of the well, includes an outer housing, a mandrel within the outer housing, and a pressure element attached to the mandrel. The pressure element can be pressurized to move radially inward to constrict a longitudinally extending flow passage in the valve between the mandrel and the outer housing. In addition, the mandrel includes annular orifices, and channel segments along the outside diameter thereof, which form tortuous and circumferential flow paths through the valve. The annular orifices and channel segments are constructed to provide a desired frictional head loss, and to control the pressure and flow rate of the injected fluid to prevent cavitation and cascading. Pressurization of the pressure element can also be controlled to vary the tortuous flow path through the flow passage, or to seal the flow passage.

Abstract: The invention concerns separating materials for thin-layer chromatography, the materials having a sorbent layer formed from sorbent particles and disposed on a carrier. A reflection intensifier, preferably magnesium tungstate and/or Bi.sub.2 O.sub.3, is added to the sorbent layer. This addition comprises at least 10 wt % relative to the amount of sorbent. In preferred embodiments, the particle size of the reflection intensifier is 3 to 5 .mu.m and the amount of the reflection intensifier is 0.6 to 15 times the amount of sorbent. These separating materials are particularly suitable for the in-situ measurement of FTIR spectra. The invention also concerns the use of these separating materials for the in-situ measurement of FTIR spectra.

Abstract: An inflatable packer includes a packer mandrel and an inflatable element reinforced across its entire length and attached at each end to the packer mandrel. The inflatable element is formed of multiple layers of elastomeric material including reinforcing plies of an elastomeric base material reinforced with helically wound strands of a reinforcing material. The reinforcing strands are evenly spaced and parallel to one another and are oriented at a predetermined helical angle with respect to a longitudinal axis of the packer. The helical angle and modulus of elasticity of the reinforcing strands can be selected to allow the inflatable element to expand by a predetermined amount even though its ends are fixed.

Abstract: Support materials for thin-layer chromatography characterized by a marker code applied using laser light.

Abstract: A packer valve for regulating the fluid flow rate and pressure within a fluid conduit such as a well, includes a housing, and an inflatable packer element mounted on an elongated mandrel. The inside diameter of the housing is formed with an arrangement of annular grooves which circumscribe the inflatable packer element. The inflatable packer element is adapted to adjust an annulus between the housing and the inflatable packer element to provide complete shutoff of fluid flow or to provide a tortuous flow path for fluid flow within the annulus. The tortuous flow path causes a frictional pressure loss. The amount of the pressure loss is controlled by the inflation pressure of the inflatable packer element, by the shape of the annular grooves, and by the length of the inflatable packer element.