Greetings Brooks:
I saw it P.M. 07/26/07. Your usual GREAT post.
Thanks
Bruce A.
Brooks Bradley wrote:
I sent this post to the list last evening. My emailer notified me that
it was transmitted successfully, but I see no evidence that it was, in
actuality, posted. It is of no great moment, but I try to keep my
postings to a nature I feel is of interest or value to the
membership.....but lengthy ones
such as this one are somewhat taxing for me, and I genuinely desire
for the information to be shared. If this post did, in fact, reach the
general list....I would appreciate someone letting me know.
Sincerely, Brooks Bradley.
Recently, we concluded some evaluations on the effectivity of an
anti-pathogenic air filtration device. It is, essentially, nothing
more than a stock, paper type, dust-mask....impregnated with 15 ppm to
20 ppm strength electrically isolated colloidal silver.
Higher particulate count CS (25% to 30%...by volume) demonstrated to
have been more effective in both speed of response....and pathogen
count reduction-----over our normal 85% to 90% ionic content CS
solutions. However, both solutions effected very positive control
responses......as evidenced by the pronounced difference between the
control samples and the treated samples-----tested downstream of both
filtering systems. The control (unmodified) face masks reduced the
bacterial populations (root-mean-square average) by approximately 15%
to 20%.....principally through physical impingement. No bacterial
casualties were evident downstream of the untreated filter masks. The
viable bacterial count immediately downstream of the CS-treated mask
was reduced, on average, by 60% to 70%. Interestingly, the bacterial
population mortality among the treated samples, continued to rise by
an additional 5% to 10%-----within .5 to 1.0 hours after ceasing
exposure to the! CS-impregnated filter medium. We were unable to
clearly establish the exact nature of the expression mechanism for
this phenomenon. This characteristic presented almost universally,
irrespective of the class of bacterial agent sample.
Our methodololgy included, essentially, the simple saturation of the
filter-paper face mask with 15 ppm to 20 ppm strength Colloidal Silver.
Tests were conducted with both dry; masks and wet (damp) masks. The
wet mask medium did remove more airborne particulate matter, but
exhibited shortened, effective, flow-through
efficiencies.....primarily because of increased passage
restriction......resulting from more rapid residue build-up.
This effect was highly pronounced when gel-based samples were employed.
Viable viral components were difficult to measure effectively,
principally because of their very small size. Because of the type of
"large passage" filter media being used, quite limited quantities of
actual viral mass were, physially removed. This fact required us to
conduct replication evaluations in order to establish the actual
effect of the CS (if any) on the viral populations physically present
downstream of the filter element. The effective reduction in viral
fecundity (replication potential) among the viral populations actually
present downstream, was approximately 50%....regardless of the exact
viral agent being tested. When viral agents were exposed to
high-quality, full-face, chemical-type respirators (altered by
saturating the fiber/cloth or suspended-particle section with CS), the
degree of control rose quite dramaticaly....sometimes to 85%....even
in those cases where the physical filter medium was significantly more
coarse (e.g. 5 microns)! than the virus size. This condition indicated
that even passing contact with CS effects
some element of control over the microscopic viruses.
Considering that our evaluations involved,principally, high-density
pathogen populations, very useful effects appear probable for persons
using cheap, CS-impregnated, paper-type dust masks for threat
reduction from airborne pathogenic agents. Pathogen control,
especially for viruses, rose considerably (approximately 15% gain) by
adding a second mask directly over the first one. This did, however,
measurably restrict the volume of airflow available.....but not enough
compromise the breathing of a normally healthy person.
The possible benefits from this simple unit appear to magnify when
considering that ariborne pathogens, generally, dissipate
exponentially with distance...in free air. Compelling evidence for
value followed the low-population-density tests ( Those using
infectious agents distributed from 4 to 5 feet distant from the
closest sensor) which we conducted. Therefore, our results indicate
very worthwhile potential for reducing susceptibility to both
weaponized biological agents, and/or epizootics presenting under more
common conditions (e.g. A/C recirculations systems in buildings,
airplanes, trains, etc).
Sincerely, Brooks Bradley.
%
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