Hi Matt,

Thanks for posting this info. I found it very interesting,
particularly since most articles I've read haven't mentioned naturally
occuring porphyrins in bacteria, but rather concentrate on application
of additional porphyric substances in addition to light therapy.

I couldn't dig up too much more that helped explain this, but here's
an article discussing light therapy (mostly laser, but again, I don't
think the light source is all that important here) and porphyrins.
It explains pretty well how they work together, namely, "Light energy
is absorbed by bacterial porphyrins, triggering production of toxic
singlet oxygen which damages or destroys the bacteria":

http://www.shorelaser.com/LaserAcneRx.html

So with your articles and other suggesting that certain bacterial seem
to have naturally occuring porphyrins, potentially light therapy can
be antibacterial for these bacteria even without the use of additional
photoactive substances (like ALA, etc).

Along these lines, the only thing that worries me is the statement
"all energy densities of Ar ion laser showed a proliferative effect on
Pseudomonas aeruginosa".

Does this sort of answer your questions? If not, let me know and
I'll take another stab at answering...

Thanks again...

Dan


--- In rosacea-support@yahoogroups.com, Matthew I <mtthw_i@...> wrote:
>
> Did a little more research. Unfortunately without more background
knowledge it's only speculation, but seems to be heading somewhere.
>
> There is a gram negative bacteria found within the Demodex Mite
called Bacillus Oleronius.
>
>
> The following is an article on LLLT and Gram Negative Bacteria. It
mentions two other types of Bacteria, being the Gram Negative
Pseudomonas aeruginosa and the Gram Positive Staphylococcus aureus.
>
> They classify the difference as follows. Gram-negative bacteria are
those that do not retain crystal violet dye in the Gram staining
protocol. Gram-positive bacteria will retain the dark blue dye after
an alcohol wash, whereas Gram-negative bacteria do not. In a Gram
stain test, a counterstain is added after the crystal violet, which
colors all Gram-negative bacteria a red or pink color. The test itself
is useful in classifying two distinctly different types of bacteria
based on structural differences in their cell walls.
>
> Here is a quote…
>
> "All energy densities of Ar ion laser showed a proliferative effect
on Pseudomonas aeruginosa and inhibitory effect on Staphylococcus
aureus. Similarly, SHG Nd:YAG and He-Ne lasers with chosen energy
densities were again proliferating for Pseudomonas aeruginosa and
inhibitory for Staphylococcus aureus"
>
> http://www.springerlink.com/content/e072158g52487462/
>
> This shows that LLLT definitely has an affect on
Gram-Negative/Positive bacteria.
>
> Unfortunately you have to purcahse the article to see it in its
entirety. If you look at the google search though it mentions
something about Gram negative Bacteria with higher amounts of
porphyrins, so it gives a teaser to possibly releasing some
information there.
>
>
http://www.google.com.au/search?hl=en&q=gram-negative+bacteria+respiratory+chain\
+porphyrin&meta=
>
>
> This article mentions Bacillus, Porphyrin and respiratory chain but
there was soo much medical jargon it was hard to put it all together.
Maybe Dan could decipher this one for us if he has a spare minute?
>
> http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=197023
>
>
> This article from the Rosacea Archives relates a possible cause to
Bacillus Oleronius also.
>
> http://www.rosacea.org/press/archive/20040503.php
>
> Hmm, All I can add is that LLLT definitely has an affect on
bacteria. But for Bacillus Oleronius specifically though, I am unsure.
>
> Matt.
>
> -------------------------------------------------------------
>
> Matt wrote: "I did some quick googling but couldn't find what the
demodex mite uses for its respiratory chain."
>
> Hi Matt,
>
> Thanks for your contribution to the discussion on this topic, which
was of course rather more detailed than the snippet above. ;)
>
> I wonder if anyone else might like to take up the challenge and
locate a study with this information? You never know, someone might
have a bit of time on their hands and want to demonstrate their
superior abilities with search engines. No harm in cautious optimism,
is there? :)
>
> Kind regards,
>
> Aurelia
>
> Send instant messages to your online friends
http://au.messenger.yahoo.com
>
> [Non-text portions of this message have been removed]
>