Re: Re: Particle sizes of mold

[Guest guest]

Dear , or others:

If "stachy" has relatively large spores, can you provide an equivalent aerodynamic diameter, in microns, for them? Does anyone also know the particle size for aspergillis spores?

Curious,

W. Bearg, PE, CIH

Concord, MA

-------------- Original message -------------- The ability of these "sticky", relatively large (for mold) spores to be rendered airborne will also be related to the level of dessication of the colony on the substrate.

Steve Temes

[Guest guest]

I believe Stachy are around 3 microns…

Jasson Walke

Mold Tech Services, Inc

www.moldtechservices.com

jasson@...

Re: Re:

Particle sizes of mold

Dear , or others:

If " stachy " has relatively large spores, can

you provide an equivalent aerodynamic diameter, in microns, for them?

Does anyone also know the particle size for aspergillis spores?

Curious,

W. Bearg, PE, CIH

Concord, MA

-------------- Original message --------------

The

ability of these " sticky " , relatively large (for mold) spores to be

rendered airborne will also be related to the level of dessication of the

colony on the substrate.

Steve Temes

FAIR

USE NOTICE:

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[Guest guest]

:

Aspergillus Flavus is 3 to 6 microns

Aspergillus Fumigatus is 2 to 3.5 microns

Aspergillus Niger is 3.5 to 5 microns

This is another reason for the limited usefulness of particle counts, molds can vary widely in size, even within the same species, however, if the area is heavily contaminated, the particle counter numbers will go through the roof on the 5 micron channel. Of course, you have to rule out other sources like plain dust !

University of Minnesota, Dept of Environmental Health and Safety has a fungus glossary on their website that lists the size of various fungi and also the aw (water activity) level.

http://www.dehs.umn.edu/iaq/fungus/glossary.html

e

Indoor Environmental Testing Inc.

Re: Re: Particle sizes of mold

Dear , or others:

If "stachy" has relatively large spores, can you provide an equivalent aerodynamic diameter, in microns, for them? Does anyone also know the particle size for aspergillis spores?

Curious,

W. Bearg, PE, CIH

Concord, MA

-------------- Original message -------------- The ability of these "sticky", relatively large (for mold) spores to be rendered airborne will also be related to the level of dessication of the colony on the substrate.

Steve TemesFAIR USE NOTICE:This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner.

[Guest guest]

Stachy is elliptical

width typically 3-5 um (my experience)

length typically 8-11(my experience)

but is reported at 3.7-7.5 width eliptical with 7-12.5 in length

(7.5-9.5 dia globose form)

As for Aspergillus, 2-6 um circular is most common, but I have seen as big as 10 um elongated

A recent presentation by Kahane, et al indicated that the 3-5 um size range was most useful for remediation determination (when compared to air-O-Cell data).

Tony

..................................................

"Tony" Havics, CHMM, CIH, PE

pH2

5450 N. Lafayette Road

Indianapolis, IN 46254

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-----Original Message-----From: e Sent: Friday, July 16, 2004 12:18 PMTo: iequality Subject: Re: Re: Particle sizes of mold

:

Aspergillus Flavus is 3 to 6 microns

Aspergillus Fumigatus is 2 to 3.5 microns

Aspergillus Niger is 3.5 to 5 microns

This is another reason for the limited usefulness of particle counts, molds can vary widely in size, even within the same species, however, if the area is heavily contaminated, the particle counter numbers will go through the roof on the 5 micron channel. Of course, you have to rule out other sources like plain dust !

University of Minnesota, Dept of Environmental Health and Safety has a fungus glossary on their website that lists the size of various fungi and also the aw (water activity) level.

http://www.dehs.umn.edu/iaq/fungus/glossary.html

e

Indoor Environmental Testing Inc.

Re: Re: Particle sizes of mold

Dear , or others:

If "stachy" has relatively large spores, can you provide an equivalent aerodynamic diameter, in microns, for them? Does anyone also know the particle size for aspergillis spores?

Curious,

W. Bearg, PE, CIH

Concord, MA

-------------- Original message -------------- The ability of these "sticky", relatively large (for mold) spores to be rendered airborne will also be related to the level of dessication of the colony on the substrate.

Steve TemesFAIR USE NOTICE:This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner. FAIR USE NOTICE:This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner.

[Guest guest]

Dear Colleagues:

First let me thank everyone who has responded to my question about the size of aspergillus spores.

Secondly, does anyone have any information on the weight or density of these spores?

Sincerely,

W. Bearg, PE, CIH

Consultant in IEQ

--------- Re: Re: Particle sizes of mold

Dear , or others:

If "stachy" has relatively large spores, can you provide an equivalent aerodynamic diameter, in microns, for them? Does anyone also know the particle size for aspergillis spores?

Curious,

W. Bearg, PE, CIH

Concord, MA

-------------- Original message -------------- The ability of these "sticky", relatively large (for mold) spores to be rendered airborne will also be related to the level of dessication of the colony on the substrate.

Steve TemesFAIR USE NOTICE:This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner. FAIR USE NOTICE:This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner.