Cobalt Blue Filter

A cobalt blue filter is an optical filter that selectively transmits blue and violet light while absorbing much of the green, yellow, and red spectrum. Its cobalt-containing glass produces this wavelength selection, allowing researchers to control illumination and reduce background light during microscopy. In immunology and infection research, cobalt blue filters can support fluorescence-based visualization of antibody-labeled cells, microbial structures, or other stained specimens by improving contrast between emitted signals and surrounding light. Their use helps researchers assess cellular localization, pathogen presence, and immune responses, although filter performance depends on the fluorophore, microscope configuration, and excitation source.

Cobalt Blue Filter - Related Videos

Education

JoVE Science Education - Chemistry

Synthesis of an Oxygen-Carrying Cobalt(II) Complex

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2023

Source: Deepika Das, Tamara M. Powers, Department of Chemistry, Texas A&M University Bioinorganic chemistry is the field of study that investigates the role that metals play in biology. Approximately half of all proteins contain metals and it is estimated that up to one third of all proteins rely on metal-containing active sites to function. Proteins that feature metals, called metalloproteins, play a vital role in a variety of cell functions that are necessary for life. Metalloproteins...

Passive Filters

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2024

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources. Low-Pass Filters Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...

Research

JoVE Journal - Biology
Free Sample

Evaluating the Effect of Coated Filters and Pre-Filters on the Infectivity and Concentration of Aerosolized Phi6 Virus

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2026

Here, we present a study to evaluate the anti-viral efficacy of copper- and silver-based surface coatings on air filters. Using a bioaerosol chamber and Phi6 bacteriophage, this method quantifies viral inactivation and mechanical filtration efficiency for self-sanitizing indoor air technologies.

Research

JoVE Journal - Engineering
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Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores

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Cited by 24 •

2015

Because of the importance and extensive use of palladium, gold and cobalt metals in high-technology equipment, their recovery and recycling constitute an important industrial challenge. The metal recovery system described herein is a simple, low-cost means for the effective detection, removal, and recovery of these metals from the urban mine.

Research

JoVE Journal - Chemistry
Free Sample

Exfoliation of Egyptian Blue and Han Blue, Two Alkali Earth Copper Silicate-based Pigments

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Cited by 34 •

2014

The preparation and exfoliation of CaCuSi4O10 and BaCuSi4O10 are described. Upon stirring in hot water, CaCuSi4O10 spontaneously exfoliates into monolayers, whereas BaCuSi4O10 requires ultrasonication in organic solvents. Near infrared (NIR) imaging illustrates the NIR emission properties of these materials, and aqueous dispersions of these nanomaterials are useful for solution processing.

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