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Archive for the ‘Medical’ Category

Disposable Transfer Pipettes (pipets)

This is going to be one of those ‘not the most exciting fun-filled’ topics we covered. But we these things are important and it is good for us to let people know about them. So without Further ado we give you Disposable Transfer Pipettes!

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Disposable Transfer Pipettes are something of an unsung hero of the labware world. While glass beakers and cylinder get a lot of the attention, these little plastic eye-dropper thingies solider on taking small quantities of a sample material and placing it into PCR plates, concave microscope slides or other containers.

Tranfer Pipettes are made of  clear, low-density polyethylene (LDPE) so they are soft and easy to manipulate. The material makes them easy to produce so they are inexpensive. They save a lot of labor that might require a lot of washing & cleaning between procedures. The LDPE is surprising durable, able to handle low temperature liquid nitrogen exposure  (-196C). The LDPE tips of the pipettes can also be heat-treated to make a completely sealed sample. All you need is a match or light and you have an instant air-tight mini liquid storage container

Transfer Pipetttes have three parts: The bulb, the shaft and the tip. The bulb is the reservoir for the majority of the liquid held by the transfer pipette, it is also the part that gets squeezed to draw in liquid or expel it. On non-disposable pipettes  a filler bulb needs to be attached or a mechanical pipettor used.

The shaft holds part of the liquid and can be graduated or not graduated with markings to show how much liquid is in the pipette.  This can be handy for measuring small quantities of liquids.

The tip can vary in size – standard tips are still pretty small and will require about 25 drops per ml. Special ‘thin-tip’ pipettes are made that can require 50-66 drops per ml. This can be handy for tight control of small quantities of a liquid material.

Disposable Transfer Pipettes come a variety of sizes, but they still only hold a small quantity of liquid. Typical is around 5ml total, with a few lines that hold 7ml. Some specialty pipettors can hold 3ml, 4ml or 1.2ml. Typically the average transfer pipette is about 6″ (150mm) long.

Spectrum Scientiics has carried disposable transfer pipettes since our opening day. Typically we carry a 5ml model that is sold in a 5-pack and has 1ml graduations on the shaft. They are not sterile. Now however we have added a wide variety of individually-wrapped and sterile disposable transfer pipettes sold in packs of 500.  The sizes we have added are:

5ml Pipettes with 0.5ml graduations on the shaft, a 3.5ml reservoir, and a tip that dispenses 22 drops per ml

7ml Pipettes with 1ml graduations on the shaft, a 3.5ml reservoir and a tip that dispenses 23 drops per ml

3ml Pipettes with 0.5ml graduations of the shaft, a 1.5ml reservoir and a tip that dispenses 22 drops per ml

5ml ‘Thin-tip’ Pipettes with no graduations, a 3,5ml shaft, and a tip that dispenses 65 drops per ml

1.2ml “Shorty” Pipettes with no graduations, a 0.9ml bulb and a tip that dispenses 25 drops per ml

5ml Pipettes with 1ml graduations on the shaft, a 3.5ml reservoir and a tip that dispenses 25 drops per ml.

5ml “Blood Bank Standard’ Pipettes with 0.5ml graduations on the shaft, a 2.4ml reservoir, and a tip that dispenses 22 drops per ml

5ml ‘Thin-tip’ Pipettes with a descending shaft (no graduations), a 1.5ml reservoir, and a tip that dispenses 50 drops per ml

7ml ‘Thin-tip’ pipettes with no graduations, a 6.0ml  reservoir, and a tip that dispenses 66 drops per ml.

4ml Pipette with no graduations, a 3.5ml reservoir, and a tip that dispenses 28 drops per ml.

All of these pipettes are sold in packs of 500 individually wrapped, sterile pipettes. They are ideal for microbiology, blood banking, hematology, immunology,  urinalysis, and tissue culture applications.

Want to buy other laboratory disposable items?

www.spectrum-scientifics.com

Microscope Slide Warmers

In the field of biological or medical research, very often microscope slides need to be warmed when they are not in use – either to keep the life in them alive or to make certain certain actions or biochemical processes are taking place. Sometimes it just won’t do to look at a cold, dead slide! For the solution to this problem we have several models of slide warmers that can help in the lab!

The two first models are fairly simple in design: A small plate-top model that has a 10″ x 7″ top with dial controlled temperature and LED display:

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A larger unit for more active labs comes with a 25″ x 8″ top:

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This has sufficient space to warm quite a collection of slides.

You may notice that these models, while excellent, do have the issue of just being a flat plate that the slides are placed on. This is OK but taking slides off the plate with gloved hands (crucial in some fields) can sometimes be a bit tricky. Also in busy labs slides can be pushed around on the plate, causing some unwanted mixing. A solution to that end is the Step-Up Slide Warmer. Sometimes its best just to let the picture do the talking:

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With this design the slide ends do not rest on the plate, making for easy retrieval. The stacked formation design also is more efficient and is able to hold twice as many slides as a plate model of the same size. Up to 40 slides can be warmed and the stacking system allows for much greater organization.

Oh, don’t forget that we also have been carrying a Microscope Stage Warmer for those who need to have their slides warmed while they are actually being observed!

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Want to purchase microscope slide & stage warmers?

www.spectrum-scientifics.com

Tissue Floating Baths

Spectrum Scientifics has added two new tissue floating baths to our product line!

Tissue floating baths are used in Histology pr pathology to loosed hard or embedded tissue. This needs to be done in a manner that does not result in wrinkles or folds. Slices of tissue also need to be spread out without the aforementioned folds and wrinkles. The tissue floating bath does with a combination of heat and water surface tension. Usually tissue sections are placed right onto slides.

Our first unit is an economical tissue floating bath. Costing just $175 this unit still has excellent features, such as a 2.3 liter black interior chamber for high visibility, a glazed glass lid,  and non-stick coating for easy cleaning!

An important feature with any tissue bath is visibility as you be able to view the specimens to make certain everything is going properly.  That’s why for more advanced users we have a Light Tissue Floating Bath

This more advanced model has side illumination that uses LEDs. This makes the chamber bright and visible for work. In addition, the unit uses a digital temperature control with push-button controls. Both set temperature and actual temperature are shown in the display for accuracy.

www.spectrum-scientifics.com

Hemocytometer

Our Hemocytometer is probably one of the most popular ‘industrial’ products that we carry.  It is well built, decently priced, and very effective for what it does.

A hemocytometer is designed to be used with a microscope to count blood cells.  The critical part of any Hemocytometer is a thick slide with a rectangular indentation with an etched grid (usually laser etched in this day and age).

The better designed slides use a grid pattern known as a Improved Neubauer. The grid has several areas of known size marked of, so that if one counts the blood cells in that grid one can get an accurate figure of how many cells are in the sample.This overall area is known as the counting chamber.

Many “Hemocytometers” are sold without any crucial accessories – one of  the most important is a Hemocytometer cover slip (shown above). This is important as the cover slip is much thicker than typical microscope cover slips. The slip cover must be placed over the counting chamber before adding the sample. The sample is then added to the edge of the cover slip and capillary action draws in the fluid . The counting chamber is then filled properly and counting can be done under a microscope. After that it is just math.

Part of the kit includes a syringe that is used to introduce the sample to the edge of the of cover slip once it is in place.

( No, we didn’t take it out of the packaging, that thing is sharp!)

Very often samples need to be diluted before counting can take place, and while not ultra-critical our kit comes with two important dilution pipets. One for red blood cells, one for white blood cells.

Naturally, they are color coded for your convenience!

Since bloodwork can be dangerous, we advise always wearing rubber gloves and cleaning hemocytometer gear completely and carefully.

Spectrum Scientific’s Hemocytometer Kit sells for $47.95 and while it lacks some of the advanced features of much more expensive sets (such as anti-reflective coatings on the counting chamber) we cannot say that prices of $200+ are worth such features.  This is also a complete kit – not just a glass slide that other companies may offer.  Be sure of your needs when ordering!

www.spectrum-scientifics.com

New Anatomy Models – Human Body Parts!

Having covered the two nifty torso models we now carry, it is time to turn our attention to the other anatomy models that we have recently added. These are most parts of the human body. Let’s start with a skull!

Now we’ve carried skulls in the past, and still do. But this human skull model is new in that it is colored to denote the various regions and bones of the human skull – occipital,etc:

These markings make learning the regions of the human skull a breeze!  The skull is life size and a great teaching tool.

Working our way down and inside the body we also now have a  life-size Model of the Human Respiratory System

Lungs, heart and larynx are all mounted on board. The entire system consists of 7 parts.

Getting back to the bones, we now have a couple of female pelvic bone models:

For more advanced users we also have a female pelvic model with internal organs

The uterus, rectum, bladder, and bone ligaments are all included with this model to show their position and relative size. Both pelvic models are life-size.

www.spectrum-scientifics.com