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Laboratory Equipment Blog

  1. WPI's Low-Noise Amplifiers Outperform Cheap Imitations
    April 30, 2013
    An amplifier, in simplest terms, is an electronic device that magnifies an input signal. However, the way an amplifier is designed to handle noise and bandwidth limitations greatly affects the quality and sustainability of the final output signal. Defining Terms To knowledgeably discuss amplifiers, let’s define a few terms. Gain – The gain is the multiplier defining how much the amplitude of an input signal is increased. A signal with an X1 gain is not amplified. An X10 gain produces an output signal ten times greater than the input signal. Noise – Any unwanted signal fluctuations are called noise. While noise can also result from external sources, for the purpose of this discussion, we are primarily concerned with the noise resulting from the inner workings of the electronic device, our amplifier. This
  2. Which Alloy is Best for My Surgical Instruments?
    April 30, 2013
    Inox, Titanium, Dumoxel®, Dumastar®, Antimagnetic... Have you ever looked at the variety of metal alloys for surgical instruments and laboratory tools and wondered which is best for your needs? Here's a brief rundown. Stainless Steel (Inox) - Our standard line of instruments are manufactured of highest quality materials, they are made of austenitic 316 steel commonly known as “surgical steel” or “marine grade steel.” Stainless steel, also known as Inox (from the French word "inoxydable"), is highly corrosion resistant and it is a common choice of material for biomedical implants or body piercing jewelery. It is in compliance with ASTM F138. This WPI line is an excellent alternative to German surgical instruments. The high-quality, corrosion-resistant instruments are available at a fraction
  3. Using a Microscope with a Stereotaxic Frame
    April 30, 2013
    You can use the PZMIV stereo microscope with a stereotaxic frame as shown in the image below. This setup shows a PZMIV-BS. The U-frame Base Plate (502045) is shown, but most stereotaxic frames can be used in this way. Choose a stereo microscope objective that allows you plenty of room to work. For example, the 0.5X objective has 187mm working distance, or the 0.32X objective has 296mm working distance. You could also add a Z-LITE-Z186 illuminator. If necessary, use a 5 to 10 lb.counter weight on the boom stand base to prevent the microscope from tipping.
  4. Constructing an Extracellular Suction Electrode
    April 30, 2013
    Suction electrodes are used with muscle research systems to record the action potentials from the stretch receptors at the same time that the length and tension of the muscle are recorded.  Materials soldering iron with solder wire strippers wooden-handled dissecting pin alcohol burner can or tube of contact or plastic cement fine flat file emery cloth electrical tape popsicle stick two pieces of chlorided silver wire (0.005” dia, 5” long) (See Chloriding Silver Wire.) three feet of shielded, two-conductor, insulated cable three color-codedconnectors that will mate to the
  5. Choosing the Correct Pump
    April 29, 2013
     WPI carries a wide variety of fluid handling tools utilizing three different technologies: peristaltic pumps syringe pumps pneumatic injectors The range of applications and the criteria used to select a particular pump or injector is broad and complex, and we encourage you to phone (866.606.1974 in the USA) or email (customerservice@wpiinc.com) us and speak to a technical support specialist. In the meantime, we have tried to simplify the process by listing all of the pumps
  6. Biosensor Specifications
    April 29, 2013
    Download a PDF version of the Biosensor Specifications Sheet here. WPI offers a range of biosensors for monitoring nitric oxide, hydrogen peroxide, oxygen and hydrogen sulfide. Specifications for these sensors are detailed below. The macrosensors are 2mm "wet" sensors. These sensors are installed in a metal "sleeve" that looks like a tiny soda straw.The sleeve has a gas permeable membrane at the tip, and it is filled with an electrolyte. When it is immersed in a solution, the gas in solution (for example, nitric oxide) diffuses through the membrane, and the sensor measures it. The microsensors are "dry" sensors. Most microsensors monitor nitric oxide, and there is also a hydrogen
  7. Buying Glass Capillaries for Making Micropipettes and Microelectrodes
    April 29, 2013
    WPI offers a wide spectrum of high-quality glass capillaries. We take pride in our ability to ship your glass order within 48 hours. If you need a special glass that does not appear in our catalog, please call us. We will make every effort to provide it for you. Fire-Polished glass capillaries are easier to insert into microelectrode holders without damaging the gasket. More importantly, fire-polished glass won’t scratch the chloridized wire used in a recording electrode. Fire-polishing does not affect the glass’s mechanical or electrical properties. Borosilicate glass capillaries: Close dimensional tolerances assure microelectrode uniformity and
  8. Compare Dri-Ref Reference Electrodes
    April 29, 2013
    Dri-Ref™ reference electrodes were developed by WPI to have extremely low electrolyte leakage properties, hence the name “Dri-Ref.” In addition to this key feature, these electrodes exhibit stable and reproducible potential and low resistance. Stored in KCl when not in use, they have a long life expectancy. Low leakage is achieved by using KONBO™, a product combining modern ceramic and conductive polymer technology, as the liquid junction. Electrode resistance is low, an important consideration when making low-noise measurements. Although the internal filling solution contains KCI, the low fluid leakage means Dri-Ref may be used in combination with ion selective electrodes, including those for K+ and Cl-, without significant contamination from the reference electrode. The Dri-Ref electrodes are che
  9. Ag/AgCl Half Cells
    April 29, 2013
    WPI's silver-silver chloride half cells are new, improved sintered pellets with lower resistance and high strength. They are stable and well-balanced in the presence of current. These small and inexpensive half-cells are easy to work with as bath electrodes.   RC1 /RC1T RC2
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