1070 Risultati per: "SIGMA ALDRICH MICROSCOPY"

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Leukocyte Alkaline Phosphatase (LAP) kits are intended for the semi-quantitative demonstration of alkaline phosphatase activity in white blood cells.

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Bromophenol blue (BroB), an arylmethane color marker dye has a molecular mass of 670 Da.

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Tetrabromophenol Blue (TBPB) belongs to the group of sulfonephthalein acid-base indicators. It is employed in the potentiometric titration of the halogens with Hg₂(NO₃)₂. In addition, it has been used as a dye indicator in urine dipstick test to detect proteinuria. In this assay, with increasing concentration of urinary protein, TBPB sequentially changes colour from pale green to blue. Binding of TBPB to proteins is dependent on pH.

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Suitable as a laser dye.

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Cell permeable fluorescent detector of nitric oxide in living cells. 4,5-Diaminofluorescein diacetate (DAF-2 DA) has been used as a fluorescent dye for NO (nitric oxide) detection.

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Esterases are ubiquitous in nature and encompass a series of different enzymes acting upon select substrates.

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ACCUSPIN System-Histopaque-1077 products are intended for use in the isolation of lymphocytes and other mononuclear cells. The separation medium, Histopaque-1077, is a sterile-filtered, endotoxin-tested solution of polysucrose and sodium diatrizoate, adjusted to a density of 1,077 g/ml. ACCUSPIN System-HISTOPAQUE-1077 employs γ-irradiated 50 mL polypropylene centrifuge tubes specially designed with two chambers separated by a porous high-density polyethylene barrier ('frit'). Each tube is aseptically filled with 15 ml of Histopaque 1077. Each tube will separate 15-30 mL of anticoagulated blood.

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Azure B (azure I) ≥89% (dye content), certified by the Biological Stain Commission, Sigma-Aldrich®

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Azobenzene 98%, Sigma-Aldrich®

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Used for the preparation of electrically conducting glasses. Used to make solutions for the separation of RNA from DNA by density gradient centrifugation.

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Fluorescent dye.

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1,4-Dimethylpyridinium iodide,99%

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Benzaldehyde tosylhydrazone,98%

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trans-4-Stilbenemethanol

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Staining of bacterial spores according to Schaeffer and Fulton; Pappenheim stain when combined with Gram′s stain

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Building block for 'Anti-Bredt' strained molecules.

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Bis(cyclohexanone)oxaldihydrazone (Cuprizone) has been used in mice to study the effect of NG2 (neural/glial antigen 2) proteoglycan on toxic-induced demyelination. It has been used to induce demyelination in mice. It has been used to study cuprizone-induced demyelination and remyelination in the corpus callosum of mice.

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Bacteriochlorophyll from Rhodopseudomonas sphaeroides has been used as a standard to calibrate the high performance liquid chromatography (HPLC).

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(3-Aminopropyl)triethoxysilane forms aminopropyl derivative of glass, an adsorbent for affinity chromatography. It is used to prepare positively charged slides suitable for use with various immunohistochemical and in situ hybridisation procedures.

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Safranin O, also known as basic red 2, is a basic, cationic, and metachromatic azine dye used as a biological stain. The characteristic azine chromophore contains the phenazine, a planar, tricyclic dibenzopyrazine, which consists of two non-planar benzene rings linked by two nitrogen atoms. A delocalised positive charge, an alternation of aromatic and quinonoid structures, and diazotisable amine groups constitute the chromophoric system. c-Methylation makes this dye of moderate overall size. The trimethyl cationic form of safranine is lipophilic, whereas the dimethyl forms are weakly hydrophilic. The dye is commercially available as a chloride.

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2,6-Diphenyl-4H-thiopyran-4-one,96%

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N-[(3-(Anilinomethylene)-2-chloro-1-cyclohexen-1-yl)methylene]aniline monohydrochloride,94%

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1-Phenyl-2,3-naphthalenedicarboxylic anhydride,98%

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2-(4-Hydroxyphenyl)-5-pyrimidinol 90%, Sigma-Aldrich®

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2-(5-Bromo-2-pyridylazo)-5-(diethylamino)phenol,97% (Bromo-PADAP).

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Azophloxine has been used as a dye in Von Kossa staining and nonlinear optical studies. It is also used in photocatalytic tests.

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A preweighed vial containing 50 mg o-Dianisidine. o-Dianisidine (3,3′-dimethoxybenzidine) is a peroxidase substrate suitable for use in ELISA procedures. This substrate produces a soluble end product that is yellow-orange in color and can be read spectrophotometrically at 405 nm. The reaction may be stopped with 5 M HCl.

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Methyl green is a synthetic, triphenylmethane-type cationic dye related to ethyl green mainly used as DNA stain in histochemistry. It possesses aniline rings with different degrees of methylation. The dye binds specifically to the A-T rich regions of the major groove of DNA with the help of two positive charges. Methyl green in combination with pyronin is extensively used to stain RNA and plasma cells in tissue sections and cytologic preparations.

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Naphthol AS-MX phosphate disodium salt,phosphatase substrate

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Naphthol AS phosphate ≥99% (by TLC) per istologia, Sigma-Aldrich®