An inoculation loop (also called a smear loop, inoculation wand or microstreaker) is a simple tool used mainly by
microbiologists to pick up and transfer a small sample of microorganisms called
inoculum
In biology, inoculum refers to the source material used for inoculation. ''Inoculum'' may refer to:
* In medicine, material that is the source of the inoculation in a vaccine
* In microbiology, propagules: cells, tissue, or viruses that are used t ...
from a
microbial culture
A microbiological culture, or microbial culture, is a method of multiplying microbial organisms by letting them reproduce in predetermined culture medium under controlled laboratory conditions. Microbial cultures are foundational and basic diagn ...
, e.g. for
streaking
Streaking is the act of running, often naked, through a public area for publicity, as a prank, a dare, or a form of protest. Streaking is often associated with sporting events, but can occur in more secluded areas. Streakers are often pursued b ...
on a
culture plate
In microbiology, a culture plate is a low flat-bottomed laboratory container for growing a layer of organisms such as bacteria, molds, and cells on a thin layer of nutrient medium. The most common types are the petri dish and multiwell plates.
...
.
[Ronald Westphal (1988): ]
Microbiological Techniques in School
', page 34. Document No. 28 in the series ''Science and Technology Education''. This process is called
inoculation
Inoculation is the act of implanting a pathogen or other microorganism. It may refer to methods of artificially inducing immunity against various infectious diseases, or it may be used to describe the spreading of disease, as in "self-inoculati ...
.
The tool consists of a thin handle with a loop about 5 mm wide or smaller at the end. It was originally made of twisted
metal
A metal (from Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typicall ...
wire (such as
platinum
Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish , a diminutive of "silver".
Platinu ...
,
tungsten
Tungsten, or wolfram, is a chemical element with the symbol W and atomic number 74. Tungsten is a rare metal found naturally on Earth almost exclusively as compounds with other elements. It was identified as a new element in 1781 and first isol ...
or
nichrome), but disposable
molded
Molding (American English) or moulding (British and Commonwealth English; see spelling differences) is the process of manufacturing by shaping liquid or pliable raw material using a rigid frame called a mold or matrix. This itself may have ...
plastic
Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...
versions are now common.
See also
*
Cell spreader
*
Micropipette
A pipette (sometimes spelled as pipett) is a laboratory tool commonly used in chemistry, biology and medicine to transport a measured volume of liquid, often as a media dispenser. Pipettes come in several designs for various purposes with diff ...
References
Laboratory equipment
Microbiology equipment
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