DeNovix Instrumentation, Technology and Developments

29 May

Cell Counting with Acridine Orange and Propidium Iodide (AO/PI)

Various methods of cell counting exist for quantifying the total number of cells in solution and calculating sample viability. The conventional method involves loading a sample into a cumbersome hemocytometer and observing particle concentration. A grid etched on the surface of the slide is used to measure cell density and determine the total cell count

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01 May

Comparing DS-11 Series and NanoDrop™ Protein Concentration Capabilities

Microvolume absorbance spectrophotometers are ubiquitous in laboratories and analytical facilities concerned with protein analysis, extraction, and purification. The two leading technologies for protein concentration measurements in biochemistry and life science applications are the DS-11 Series combined spectrophotometer / fluorometer from DeNovix, and the NanoDropTM family of instruments from Thermo Fisher Scientific. Each of these analytical

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20 Dec

Fluorescence Assays and the Benefits of Multiple Fluorescence Channels

Fluorescence assays are critical in biochemical and life sciences applications using fluorometry for sample quantification. These comprise fluorophores that bind specifically to analytes of interest and exhibit distinct excitation and emission profiles. In principle, the intensity of light emitted is directly correlative to sample concentration. Leading-edge fluorescence assays enable extremely precise biomolecule detection with, for

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26 Nov

Fluorescence Analysis: 4 Differences Between Absorbance and Fluorescence

Absorbance and fluorescence analysis are distinct yet complementary techniques used to detect and quantify analytes of interest in a sample. Measuring the absorbance of ultraviolet and visible (UV-Vis) light at specific wavelengths is one of the most established methods of quantitating biomolecules. Fluorescence analysis, meanwhile, has long been used to measure the emission spectra of

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02 Nov

Microvolume Analysis of Protein Samples

Measuring the UV-light absorption of proteins is the most straightforward method of microvolume protein analysis for concentration and purity. The aromatic amino acids and residues of many proteins exhibit strong ultraviolet absorption with a peak at 280nm.  The amount of light absorbed is proportional to the concentration of the sample. Using the Beer-Lambert equation, it

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16 Oct

What is a UV-Vis Spectrophotometer?

Ultraviolet-visible (UV-Vis) spectrophotometry is a technique used to measure light absorbance across the ultraviolet and visible ranges of the electromagnetic spectrum. When incident light strikes matter it can either be absorbed, reflected, or transmitted. The absorbance of radiation in the UV-Vis range causes atomic excitation, which refers to the transition of molecules from a low-energy

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21 Sep

The Working Principle of a Fluorometer

Fluorometers are used for precise quantitation of biological molecules including nucleic acids and proteins in microliter (μl) samples. They can measure the concentration of double- and single-stranded DNA (dsDNA and ssDNA), ribonucleic acid (RNA), and proteins in solution with demonstrable applications in a range of biochemical fields. Life science, environmental monitoring, pharmaceutical quality control, and

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