Strip, filter paper

Test strip Filter paper that has been saturated with CoClj and then dried changes from blue to pink in the presence of O/W emulsion (the water reacts with the cobalt chloride). 

Both these acids are colourless, but the spots of each acid on a filter-paper strip show up in ultraviolet light as intense blue fluorescent zones. They can also be detected, but considerably less sensitively, by spraying with ethanolic ferric chloride solution, which gives with N-methylanthranilic acid a purple-brown coloration. 

Method. Prepare a paper strip from Whatman No i filter paper, as in the previous experiment, and draw a light pencil line about 3 cm. from the bottom cf. Fig. 25(B)). Mark three points A, B and C symmetrically on this line, if possible 2 cm. apart. Using the fine pipette, or a capillary tube, apply sufficient of solution (A) to the point A to give a damp spot about 0-5 cm. in diameter. Using a thoroughly washed pipette or a fresh capillary tube on each occasion, apply solution (B) and (C) to the points B and C respectively. Dry the strip in the air. 

Filtrier-erde, /. filtering earth. -flMche, /. filtering surface or area, -flasche, /. filtering flask, -gestell, n. filter stand, -hut, m. (paper) filtering funnel, -kessel, m. filtering boiler, -konus, m. filter cone, -korb, m. filtering basket, -nutsche, /. suction filter, -papier, n. filter paper, -papierstreifen, m. strip of filter paper, -platte, /. filter plate, -presse, /. filter press, -pumpe, /. filter... 

Odor. Det odor in accordance with ASTM D1296. In this test strips of filter paper are dipped into specimen and reference standards, and odor comparisons are made of characteristic odor when the strips are wet, and residual odor remaining after the strips appear dry. If an odor persists on the sample paper after the point in time when no odor is detectable on the standard paper, the odor is reported as residual ... 

The USP also recommends the use of biological indicators, whenever possible, to monitor all sterilization methods except sterile filtration. Biological indicators are generally of two types. If a product to be sterilized is a liquid, microorganisms are added directly to carefully identified representative samples of the product. When this is not practical, as with solids or equipment to be sterilized, the culture is added to strips of filter paper. The organism chosen varies with the method of sterilization. 

Larval maturation studies, sometimes referred to as cultures, can be performed on fecal specimens applied to wet filter paper. Nematode larvae such as Strongyloides spp. or hookworm mature to the filariform stages in the culture container and migrate from feces into water, where they are detected microscopically. The procedure can be performed in a petri dish with a square of filter paper or in a large test tube with a strip of filter paper. 

Saturate strips of filter paper with 2% p-dimethylamino-... 

Colored household items made of plastics and other polymers [21] are tested similarly. The effect of food may be imitated by using coconut oil or peanut oil ( coconut oil test ). Strips of filter paper soaked with these materials typically remain in contact with the test sample for 5 hours at 50°C. 

The prepared Ampholine gel is set up in the tank and thick filter paper strips are soaked with either the anodic or cathodic electrolyte and placed along the appropriate edge of the gel. The samples may be applied either to small filter paper squares laid on the surface of the gel or, for bulk preparative work, incorporated in the gel. The appropriate voltage is applied through terminals attached to the electrode wicks and after about 30 min can be switched off to permit the removal of the sample filter papers before continuing the separation. 

Review the purpose of a salt bridge in the voltaic cell. In this experiment, the filter paper strips soaked in potassium nitrate are the salt bridges. 

Soak the strips of filter paper in 2 mL of potassium nitrate solution. These are the salt bridges... 

Time-resolved approaches for multi-analyte immunoassays have been described recently. Simultaneous determination of LH, follicle stimulating hormone (FSH), hCG, and prolactin (PRL) in a multisite manual strip format has been reported. 88 Four microtiter wells are attached to a plastic strip, two-by-two and back-to-back, such that the wells can be read on a microtiter plate reader. In a quadruple-label format, the simultaneous quantitative determination of four analytes in dried blood spots can be done using europium, samarium, dysprosium, and terbium. 89 In this approach, thyroid-stimulating hormone, 17-a-hydroxyprogesterone, immunoreactive trypsin, and creatine kinase MM (CK-MM) isoenzyme are determined from dried blood samples spotted on filter paper in a microtiter well coated with a mixture of antibodies. Dissociative fluorescence enhancement of the four ions using cofluorescence-based enhancement solutions enables the time-resolved fluorescence of each ion to be measured through four narrow-band interference filters. 

The Wilhelmy plate method provides an extremely simple approach that, unlike the ring detachment method, permits the measurement of continuously varying or dynamic surface tensions. If a thin plate (e.g., a microscope slide, a strip of platinum foil, or even a slip of filter paper) is attached to a microbalance and suspended so that its lower edge is just immersed in a liquid, the measured apparent weight Wj, is related to the actual weight of the plate Wp and the surface tension y by the following simple equation ... 

Assume that you have solid PbCh, a strip of zinc metal, filter paper, an electronic balance, and any other standard laboratory equipment. 

Label the ends of the filter paper with the metal strips to be tested (See Figure A). 

Colorimetric field tests for TATP and HMTD were described in Section 5 dealing with peroxide-based explosives. This group contains Keinan s PEX [85] (E. Keinan, Personal Communication, February 2006) and the kit developed by Schulte-Ladbeck et al., which involves also a preliminary stage to avoid falsepositive responses by non-explosive peroxides [86]. The color change of molybdenum hydrogen bronze suspension upon reaction with TATP was recommended also as a field test. Exposure of filter paper strips which were soaked in butanol suspension of the molybdenum compound to TATP or hydrogen peroxide vapors rapidly bleaches the blue color [87, 88]. 

Tensile Tests. Polymers were padded on filter paper at lOX add-on, cured at 150°C for 3 or 10 min, and tested as In Tappi Useful Method UH656. Tensile measurements on padded samples were done with 1" strips on an Instron Tester after conditioning In a constant temperature and humidity room. Wet, methyl ethyl ketone (MEK) and perchloroethylene (PCE) tenslles were run after brushing the sample with IX aqueous Aerosol OT or solvent. 

If the crystals stick to the vessel, loosen them gently inside the drop using micro tools or very thin strips of filter paper (the edge of the strip that will touch the crystal is best torn rather than cleanly cut with scissors). 

Phosphate must be applied as fertilizer to the soil. Ideally it is added in quantities sufficient to guarantee optimal yields, but not in excess in order to avoid P transportation into other compartments of the ecosystem. The amount added should be based on an accurate estimation of the plant-available fraction of P already present in a soil.This is an old and difficult task and a large number of extraction methods have been used since intensive land use was practised. Recently methods have been worked out in which a strip of filter paper impregnated with an Fe oxide (2-line ferri-hydrite) is dipped into a soil suspension and the amount of P adsorbed by the paper is taken as being plant-available (Sissingh,1988 Van der Zee et ah, 1987 Sharpley, 1993 Sharpley et ah,1994 Kuo and Jellum, 1994 Myers et ah 1997). Anion and cation resins extracted more P from four heavily fertilized soils than from goethite (Delgado Torrent, 2000). Other oxyanions adsorbed by soil Fe oxides are silicate, arsenate, chromate, selenite ( ) and sulphate. Adsorption of sulphate led to a release of OH ions and was substantially lowered once the Fe oxides were selectively removed (Fig.16.17). 

Figure 4.12 — (A) Flow-cell for the simultaneous determination of four analytes (1) ion-selective electrodes (2) reference electrode (3) Pt wire for grounding (4) Teflon gasket (5) carrier (6) inlet for reference solution (7) waste (8) screws (9) diecast box (10) rubber sheet for sealing. (B) Seven-electrode holder (the reference electrode is placed from the top into die central bore). ISEs for Na, K, Ca ", NOj", Cr, and HCO, (NH, electrode with internal buffer of 0.1 mmol/L NaHCOj) are placed horizontally around the reference electrode, the metal waste tubes being connected to the waste via filter-paper strips. (Reproduced from [124] and [108] with permission of Elsevier Science Publishers and VCH Publishers, respectively).

Apply some drops of kerosene on the cooling block of the horizontal electrophoresis apparatus and apply the IPG strips with the acidic side to the anode. Make 1 cm broad strips from 2 mm thick filter paper. Wet the strips with deionized water (no ultra-pure water ) and place them on top of the IPG strips as well as at the anodic (acidic) and the cathodic (basic) ends of the strip(s). 

Place a glass plate somewhat larger than the gel over a tray filled with Soln. D. Wet thick filter paper, e.g., Whatman 3MM, with Soln. D and spread it over the glass plate, the ends dipping into Soln. D. Now place the gel on the filter paper and remove air bubbles. Cover the sides of the gel by strips of plastic wrap and put the wetted membrane onto the gel. 

Odor — shall have characteristic "banana oil odor and shall leave no residual odor when tested accdg to FedTestMethodSrd No 141a, Method 4401, Sept I, 1965 Procedure Note the odor immediately upon opening the container. In addition, dip a strip of heavy filter paper (Whatman No 2 or equal) into container with EtAcet and hang the test strip on a suitable support. Place it in... 

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