1070 Risultati per: "SIGMA ALDRICH MICROSCOPY"

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A high sensitivity dye used to detect single nucleic acid molecules. DAPI has been shown to detect a single DNA molecule in solution, and to detect femtograms of DNA in single cells and chloroplasts.

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2,3-Diaminonaphthalene is also known as 2,3-Naphthalenediamine or DAN. It is one of the isomers of naphthalene bearing two amino groups, which are also called naphthalenediamines. They are usually prepared by reducing the nitronaphthalene derivative and aminating the subsequent hydroxynaphthalene derivative.

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3,5-Dinitroanilina 97%, Sigma-Aldrich®

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Neutral red (C.l. 50040, Cl Basic red 5) is a protonated diaminophenazine dye that has a small planar conjugated system.

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Reagent for assay of indole product of apotryptophanase and tryptophanase. DMAC produces colored adducts with flavanols for subsequent HPLC. It has been used in a chromogenic method for quantifying proanthocyandines in cranberry powder.

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General purpose cytoplasmic counterstain. Used with hematoxylin and eosin staining.

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Standard stain for microscopy. It may be also be used as a reference standard in the determination of azocarmine G in food products and beverages using high performance liquid chromatography coupled with diode array detector (HPLC-DAD).

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This is the pure, principal component of mixtures commonly referred to as Basic Fuchsin.

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Excellent reagent for detecting a wide variety of natural products on TLC plates: steroids, prostaglandins, carbohydrates, phenols, glycosides, sapogenins, antibiotics, mycotoxins, antioxidants etc. A range of colors is produced on heating, adding a qualitative aspect to the detection process.

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Jenner's stain,certified by the Biological Stain Commission (Jenner Stain; Eosin-Methylene Blue)

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Blu metilene ≥82% (dye content), certified by the Biological Stain Commission, Sigma-Aldrich®

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HistoChoice® is a patented, complex mixture of agents that allow tissues to retain their structure, antigenic sites and nucleic acid sites. This formulation in non-citrus, contains no mercury, formaldehyde or glutaraldehyde.

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Histo/Zyme is a stabilized proteolytic enzyme in buffered solution, used to unmask immunoreactive sites altered by fixation and/or the embedding process. Treatment with a proteolytic enzyme in immunohistochemistry (IHC) is required to digest excess linkages and expose the antigen. The use of Histo/Zyme results in superior staining over traditionally used enzyme pretreatments, such as pepsin and trypsin. Moreover, Histo/Zyme requires only a brief incubation at room temperature. Performing antigen recovery with Histo/Zyme will allow you to dilute the primary antibody 5 to 10 fold further and achieve optimal staining.

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Amido nero 10B ~50% (dye content), Sigma-Aldrich®

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Fura 2-AM (Fura 2) is a calcium-specific ratio-metric fluorescent dye. It is also known as acetoxy-methyl-ester. In response to calcium ions, ratio metric dyes like Fura 2 changes their respective excitation or emission spectra. The intracellular calcium concentration is determined by the fluorescence emission ratio or excitation at distinct wavelengths. Fura 2 has an emission peak at 505 nm, and the excitation peak ranges between 340 to 380 nm and is the preferred calcium indicator.

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Suitable for use as a catalyst for electron microscopy. Modified to render it safe in transit.

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Intended for use in the Sigma Masson Trichrome Procedure, HT15.

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Intended for use in the study of connective tissue, muscle and collagen fibers. Stains collagen green.

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Kit is used to demonstrate acid phosphatase and tartrate resistant acid phosphatase (TRAP) in blood, bone marrow and tissue touch preparations.

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Fluorescent molecular rotor

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Diatrizoic acid has been used as a contrast-enhancing fluid for X-ray based measurements.

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Application in high throughput screening.

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SynaptoGreen(TM) C4. ≥95% (HPLC), solid (FM1-43; N-(3-triethylammoniumpropyl) -4-(4-(dibutylamino)styryl) pyridinium dibromide; Pyridinium, 4-[2-[4-(dibutylamino)phenyl]ethenyl]- 1-[3-(triethylammonio)propyl]- , dibromide)

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Used as a 'blueing reagent' in hematoxylin and eosin staining procedures. Scott's tap water substitute concentrate has been used in transferase mediated dUTP nick end labeling (TUNEL) assay. It has been used in immunohistochemical analysis.

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When blood films are stained using Giemsa Stain, the nucleus and cytoplasm of white blood cells take on characteristic blue or pink coloration. The use of purified eosin and thiazine dyes minimizes lot-to-lot variation.

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Phloxine B has been used as a component of yeast extract peptone dextrose (YEPD) to grow Schizosaccharomyces pombe.

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Eosina-blu di metilene sec. May-Grünwald soluzione, Sigma-Aldrich®

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An important fluorophore prepared in high purtity with a detection limit of TMR-labeled amino acids by capillary electrophoresis of approx. 600 molecules. Readily excited by the 546 nm spectral line from mercury-arc lamps used in fluorescent microscopes, and is intrinsically more photostable than fluorescein.

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Spurr resin is a hydrophobic resin. It is less viscous than epon mixtures and is easier to dispense. The low viscosity of the resin contributes to its penetration in tissue, mineral and dense structures. A low viscosity of 60 cps also allows easy penetration into a variety of difficult materials.

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Fluorescent label for glycoproteins and saccharides.
8-Aminopyrene-1,3,6-trisulfonic acid trisodium salt (APTS) has been used for the detection of human milk oligosaccharides using multiplexed CGE with LIF (capillary gel electrophoresis with laser-induced