Pumps, Valves & Liquid Handling
Positive-Displacement Pipette Simplifi es Environmental Microbiology Research
Researchers at the University of Alaska Fairbanks are using a Mettler Toledo Rainin Pos-D™ positive-displacement pipette to investigate the role of chemical dispersants in the biodegradation of oil in Arctic marine environments. Taylor Gofstein, a PhD student, explained: “Little is known about the fate of oil or oil spill response chemicals – like dispersants – in Arctic waters, since most studies regarding dispersants are performed in temperate regions. There is currently a pretty hot debate in the environmental microbiology community about the role dispersants play in the biodegradation of oil; one hypothesis suggests that they increase bioavailability to microorganisms – speeding up the process – while a few researchers suggest they are degraded in preference to petroleum contaminants, slowing the process. This is a key question we are interested in answering, and we recently performed a major incubation experiment using Arctic seawater.”
“Starting with 250 litres of water from just off Barrow, the northern-most point of the USA, his investigation included 180 one litre bottles and 165 stirrer plates. Our target was to achieve an oil-in-water concentration of around 50 ppm, requiring just 47 µl of crude oil per bottle. Pipetting oil accurately with a traditional air displacement pipette would be an exercise in futility, so we were lucky to have a Rainin Pos-D pipette available for this work. Unlike with some other positive-displacement pipettes, the Rainin tips come pre-assembled, meaning we can autoclave them and just use them as we would for a standard pipette, without worrying about sterility and contamination. The pipette is also ergonomically designed and has a very smooth mechanism, making it quick and easy to use.”
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Dispensing Device with Media Recirculation System Guarantees Reproducible Results
ceramus® is a dispensing device with media recirculation system for manual dispensing directly out of the bottle. It is available in six different volume configurations. Uncompromising reliability- Years of experience gained by Hirschmann in liquid handling are reflected in the perfection embodied in ceramus® and absolute attention to detail. The graduation gauge and digital volume configuration engagement guarantee consistent precision and volume dispensing and ensure reproducible results – absolutely independent of the user.
The ceramic piston is made of extremely hard, high-purity aluminium oxide ceramic and is fitted into the DURAN® glass cylinder with micrometer precision for an absolutely tight seal. This achieves impressive ease of guidance and a maximum degree of functional reliability. Abrasion, serration, gushing or the detaching of a layer are prevented.
The dispensing piston and the DURAN® glass cylinder guarantee a maximum level of chemical and thermal resistance throughout the entire period of use.
The high-quality materials in all parts conveying medium enable the use of ceramus® within a temperature range from 4°C to 50°C, and the unit can be steam sterilised without disassembling at 121°C. ceramus® is equipped with a unique comfortable media recirculation system. Venting is realised simply, reliably and rapidly with a single rotation – without reagent loss.
A special version designed for dispensing very aggressive media, the ceramus® HF, is also available. The piston, cylinder, valve seats and balls are made of high-purity aluminium oxide ceramic, while the valve springs are made of platinum-iridium.
A wide range of accessories is available within the scope of the ceramus® product line. The bottle support, which ensures secure standing of the bottle, is suitable for all round and square bottles with 75-120 mm diameter or base edge length respectively.
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New TubeFiller TF3000 Introduced
BioTool’s TubeFiller is designed to reduce repetitive manual fi lling of most format laboratory racked vials. Based on its dedicated function to fi ll ‘any vial in any rack’, the design includes an integrated pump to cover the standard microbiology fi lling range.
For high throughput fi lling applications, customer designed frames allow fast and exact rack positioning and repositioning.
The intuitive software allows simplest XY oriented vial rack setup. Every new rack setup is programmed via the rack drag and drop menu. The rack corner laser tracking simplifi es the exact positioning by checking the fi rst and last vial in each rack.
Chris Jawurek said: “The devices simplicity and the customer specifi c rack and frame solution offered is loved by many customers. The layout will be approved by the user prior to production and the fact that almost every shape and form of the compartments can be condensed and processed. The new and fast version of the TubeFiller is highly desired for bottle fi lling.”
Designed to its ‘fi ll-only-application’, the TubeFiller is a cost effective tube fi lling solution.
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