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Accurate and Repeatable Particle Sizing using Laboratory Test Sieves
A Laboratory test sieve is an instrument which is used for the measurement of particle size. In its most common form, it consists of a woven wire screen, with square apertures, rigidly mounted in a shallow cylindrical metal frame. For coarse sieving a perforated plate screen with square or round holes may be used in place of wire mesh. Square hole perforated plate sieves range down to 4 mm and round hole sieves down to 1 mm aperture.
The sizes of solid particles from 125 mm down to 20 µm can be measured rapidly and efficiently by means of standard test sieves. Special sieves with apertures smaller than 20 µm are available, but it should be appreciated that the finer a screen is, the more easily will certain types of particulate solids tend to block or blind the apertures. Nevertheless, ‘micro’ sieving can be carried out down to 5 µm using special techniques.
Particle size, as measured by test sieving, may be specified simply by quoting two sieve sizes, one through which the particles have passed, and the other on which they are retained, i.e. the particle size distribution.
Endecotts Ltd provide all the equipment necessary to perform meaningful particle size analysis using sieves to receive accurate and repeatable results every time.
More information online:
ilmt.co/PL/Ld3m 49541pr@reply-direct.com Electronic Pipette Helps Researchers Increase Throughput and Accuracy
Researchers at the University of North Texas are using Integra’s VIAFLO 96 electronic pipette to increase the throughput of their ELISA, Luminex and flow cytometry workflows, as well as to improve the reproducibility of their results. The Applied Physiology Laboratory at UNT focuses on research in two key areas - physiologic and immunologic consequences of weight change, and using nutritional countermeasures to maximise immune health after exercise - and performs analysis and testing for other research groups in related fields. Professor Brian McFarlin explained: “We conduct a lot of multiplexed analysis of protein and RNA biomarkers, and this requires precise pipetting. For one study we were performing 50 flow cytometry preps per blood sample, and had over 2,000 samples, so we needed to reduce the amount of manual pipetting we were carrying out.”
“I came across the VIAFLO 96 at a biomarker conference and, after seeing the ability to change the modules to have different volumes, I knew it was just what I needed. It’s been an absolute lifesaver for our work; we use it for sample transfer from storage tubes to reagent plates and reagent additions, especially for running Luminex®
assays and
ELISAs. We have since added VIAFLO and VOYAGER electronic pipettes and an ASSIST to our collection, and we’re looking to purchase an ASSIST PLUS for our workflow. We exclusively use Integra pipettes for all of our liquid transfer work because of the benefits they offer; not only has our throughput increased tremendously, saving a lot of time, but the performance of our assays has improved. Our results are much more reproducible and there is a reduced risk of error,” concluded Brian.
More information online:
ilmt.co/PL/9Xe6 49475pr@reply-direct.com Chemical Resistant Diaphragm Pumps for Laboratory Applications
The C-series of chemical resistant diaphragm pumps from Wiggens are suitable for use in in the chemical, pharmaceutical, petrochemical and other industries, such as suction filtration, vacuum distillation, rotational evaporation, vacuum concentration, centrifugal concentration and solid phase extraction, to name a few.
The versatile C-series of pumps can be widely used for hard acidic, basic and solvent vapours by utilising corrosion proof PTFE on all the wetted surfaces. As the vacuum chamber and drive chamber are separated and sealed, an extended working life of mechanical components is ensured. C-series pumps are driven by diaphragm which eliminates the need for lubrication, oil
and maintenance. The quality vibration-proof assembly makes the pump run at the lowest noise level (less than 50dB).
A variety of models are available to meet the various needs of the laboratory, with a minimum vacuum of up to 2 mbar. Each pump motor has a built-in thermal protection device to shut off the pump automatically when overheated, and then resume working when the temperature cools down. It can be matched with rotary evaporators, vacuum controllers, VDM vacuum digital meters and filtration systems, all of them from Wiggens.
More information online: http:
ilmt.co/PL/dDpW 49749pr@reply-direct.com
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