HDTenEightyP/NetNews huggingface dataset:
From: fujimoto@carson.u.washington.edu (Bryant Fujimoto)
Subject: Re: h2o2 and disinfection...
Organization: University of Washington
Date: Mon, 23 Nov 1992 19:19:11 GMT

hendric@chester.ksu.ksu.edu (Richard Hendricks) writes:

>Does anyone know exactly why h2o2 is used for disinfection/put on wounds?
>Does it kill bacteria by the release of free o2, by heat produced during
>the reaction, or what?
>thanks!
>-richard hendricks
>hendric@matt.ksu.ksu.edu
>ps, dont replay directly to me!  send it to matt.ksu.ksu.edu instead...

My understanding is that the bacteria you are trying to kill are
anerobic and do not have the necessary enzymes to protect themselves
from H2O2 and singlet O2 which are only present in aerobic situations
(though not in large quantities of course).  The H2O2 then reacts with
the bacteria, which injures it.  Enough of this presumably kills the
bacteria.  

I had an infected wound when I was in high school (much too long ago)
and H2O2 was used to disinfect it.  However recently I had an
infected wound and the physician prescribed a solution of thymol
alcohol.  Does anyone know how thymol alcohol works?

Bryant Fujimoto

Newsgroups: sci.chem
From: smithrs@ucsu.Colorado.EDU (SMITH  RANDALL SCOTT)
Subject: Re: Oil Spills
Organization: University of Colorado, Boulder
Date: Mon, 16 Nov 1992 16:47:42 GMT

In article <74956@hydra.gatech.EDU> gtd205a@prism.gatech.EDU (Hody Crouch) writes:
>In article <92318.230825KRK4@psuvm.psu.edu> KRK4@psuvm.psu.edu (Kyle R. Krom) writes:
>>
>>  I've been reading about the efforts to clean up the Alaskan coastline
>>since the Exxon Valdez incident, and was thinking...  what exactly is the
>>major difficulty with cleaning up oil spills in the water?  It can be
>>reasonably contained, and it floats on the top, so why can't it be scooped
>>up somehow?  Please feel free to elaborate a bit, since I have several
>>questions, depending on the responses to this basic problem.
>
>Well, the method that you suggest cleaned up the vast majority of the spilled
>oil.  The coast guard and other organizations put out large booms and the oil
>was 'skimmed' off the top of the water.  Here are the main problems.
>  1.  Some of the oil reached land, where it coated the shoreline, and any 
>animal on it.  Once on the shore, oil becomes extremely difficult to clean up.
>And even if it is cleaned up, much damage has already been done.
>
>  2.  Oil also begins to spread through the water.  The oil molecules attract
>H2O, and when enough water molecules surround a small oil molecule, it can 
>'dissolve' (used in the loosest sense of the word).
>
>Those are the only big problems I can tink of right now... hope it helps.
>
>
One of the major problems with oil spills on water is that the oil emulsifies
under wave action.  The goopy lumps of oil-water emulsion have a nasty tendency
to sink.  These lumps roll about the seafloor, coating whatever is unfortunate
enough to get in their way.  Aside from containing loads of toxic hydrocarbons,
the tarry sludge is also high in heavy metals (remember, this stuff is usually
unrefined).  Tar balls can wash ashore weeks after the visible mess on the
surface has been cleaned up or evaporated.

Randall Smith
smithrs@ucsu.colorado.edu

Newsgroups: sci.chem
From: dblackbu@alleg.edu (Dave Blackburn)
Subject: Re: Gold dust a fire hazard?
Organization: Allegheny College
Date: Tue, 17 Nov 1992 17:44:13 GMT

This thread has been going on a very long time. I therefore volunteer to do  
the definitive experiment, attempting to ignite some gold dust in air.
Anyone who wishes co-author credit may assist by mailing me a few kilos of the  
needed reagents.


Oh, yeah, :-)


--

* Dave Blackburn  dblackbu@alleg.edu  flames to self@home.dev.null *          
* Chemistry, Macs, Hypercard, cats,  <>< religion, & the Dead      *
* (Anyone else who held these opinions would be as crazy as I am.) *
*   "Sometimes the songs that we hear are just songs of our own"   *
From: xenon@drycas.club.cc.cmu.edu
Newsgroups: sci.chem
Subject: re: Drying azeotrope wanted
Date: 18 Nov 92 09:43:24 -0500
Summary: answers received, thanks...
Distribution: world
Organization: Carnegie Mellon Computer Club

Thanks to everyone who helped me with this question.  This newsgroup is really
an excellent source for the kind of information that one knows vaguely but 
can't quite remember the details.

- xenon 
Newsgroups: sci.chem
From: jeroen@dxcern.cern.ch (Jeroen Belleman)
Subject: Re: Gold dust a fire hazard?
Organization: CERN European Laboratory for Particle Physics
Date: Mon, 16 Nov 1992 10:16:31 GMT

In article <1e0bf6INNfud@transfer.stratus.com> det@phlan.sw.stratus.com (David Toland) writes:
>
>Probably the manufacturer is deciding to err on the side of caution,
>as MOST finely divided metals can combust explosively.
>

Yeah, probably. Nevertheless, if supposedly knowledgable people start
warning for non-existent hazards, how much longer are we going to
heed them?

>A few years ago, BTW, I did some work with lithium dispersion.  You can't
>even expose it to an N2 atmosphere (it burns to lithium nitride).  We
>worked with in an Ar filled glovebox.  And lithium is tame among the
>alkali metals!

Powdered Li? That must be pretty reactive indeed. Here at CERN we had
a chap who played around with Li foil. He worked in a room which had
two huge dessicators taking turns at drying the air in the room. The
foil remained clean and shiny. If he took a piece outside
it would tarnish immediately.


Best regards,
Jeroen Belleman
jeroen@dxcern
Xref: sparky sci.chem:4638 sci.bio:4153
From: bg055@cleveland.Freenet.Edu (Stewart Rowe)
Newsgroups: sci.chem,sci.bio
Subject: Re: Food safety - where can I get info?
Date: 17 Nov 92 00:38:15 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: hela.ins.cwru.edu


Go to your library and browse through Title 21 of the Code of Federal
Regulations, looking in the food section for "Indirect Food Additives".
And, of course, call your nearest FDA office for guidance. That's what
they are there for.
  Using any material not already on the approved lists requires a
food additive petition, much data to prove non-extraction, and
a couple of years at least.
 -Stewart Rowe usr2210a@tso.uc.edu  srowe@igc.org
Newsgroups: sci.chem,rec.pyrotechnics,rec.models.rockets
From: billn@hpcvaac.cv.hp.com (bill nelson)
Subject: Re: H2O2/UDMH/RFNA propellant suppliers in Los Angeles Area?
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
Date: Sat, 21 Nov 1992 08:59:10 GMT

merlin@neuro.usc.edu (merlin) writes:
: Does anyone know of a good supplier of H2O2 and UDMH (unsymmetrical
: dimethyl hydrazine) in the Los Angeles area?  We need a more or less
: decent propellant for our small liquid fueled model rocket project.
: How about red fuming nitric acid or at least the precursors thereof?

H2O2, you should be able to find in any well stocked chemical lab. As
for the UDMH or HNO3, that would depend on the lab.

: I suppose we could use liquid oxygen and liquid hydrogen which we
: already have on hand in the lab -- but some of the designs we want
: to use originally specified H2O2 and UDMH for proper mixing.

Unless you are willing to make provisions for cyrogenic temperatures,
you don't want to use LOX and LH.

: Has anyone had experience filing permits required for launching our
: model rocket with the FAA, the AQMD, and/or anyone else who may care?

I seem to recall that another University has/had such a project in
process. Maybe it was the University of Colorado - I do not recall.
I will attempt to find the article I read - it may have been in an
issue of "High Power Rocketry".

Bill
Newsgroups: sci.chem
From: smithrs@ucsu.Colorado.EDU (SMITH  RANDALL SCOTT)
Subject: Re: Why Not ? (Re: Ethanol fuel
Organization: University of Colorado, Boulder
Date: Tue, 17 Nov 1992 15:18:35 GMT

In article <1992Nov16.193013.42100@ns1.cc.lehigh.edu> ps02@ns1.cc.lehigh.edu (PENELOPE E. SMITH) writes:
>(Lots of discussion on ETHANOL as fuel deleted)
>
>I want my car to run on Honey or other carbohydrates, sort of like the home
>energy fusion reactor in the car in back to the future.  This type of fuel
>cell has the advantage of not requiring distillation!
>

The most recent _Chemical and Engineering News_ had a short blurb on a recent
successful test of vegetable oil being used as fuel in the public transport
system of a city in S.D. (Souix Falls ?).  Are you thinking along these lines?
Using vegetable oils (corn oil predominantly, if I remember rightly) decreases
sulfide emissions.

Randall Smith
smithrs@ucsu.colorado.edu


Newsgroups: sci.chem
From: bjgaed@bb1t.monsanto.com
Subject: Re: molecular sieves for removing water
Organization: Monsanto Company, St. Louis, MO
Date: Fri, 20 Nov 1992 13:07:22 GMT

In article <TK.92Nov19172951@entropy.ai.mit.edu>, tk@ai.mit.edu (Tom Knight) writes:
> I've seen several references in the literature to the use of molecular
> sieves (presumably some sort of zeolite) as a way of temporarily
> removing water from a closed system.  In one case it was to dry a
> non-aqueous liquid (fluorinert), and in another to trap moisture in a
> cooled vacuum system.
> 
> I'd like some commercial sources or articles describing these uses in
> more detail, if someone is aware of them.  Thanks.
-- 
The leading commercial source is W.R.Grace's Davison Chemicals 
division out of Baltimore, Md.  For lab scale work all different types 
of mol. sieves are sold by Aldrich.

The best references in this area are a series of articles in J. Org. 
Chem. from about 10 years ago from a university group somewhere in the 
Far East (Malaysia?) where they did a study of drying times and 
efficiencies of various types of molecular sieves and a variety of 
organic solvents using tritiated water.  Sorry I can't be more 
specific, but my copies of these articles are on loan to a colleague 
who is out of town.  If someone else knows the refs. they can post, or 
I will have it on Monday.


--Electric Monk            (Bruce Gaede); 
                            e-mail: bjgaed@ccmail.monsanto.com

"...and then time started seriously to pass."
--Douglas Adams, _Dirk Gently's Holistic Detective Agency_
Newsgroups: sci.chem,rec.pyrotechnics
From: dexter@aries.scs.uiuc.edu (Annette Dexter)
Subject: Re: H2O2 Version 2.1
Organization: University of Illinois at Urbana
Date: Thu, 19 Nov 1992 04:57:11 GMT

dmeier@casbah.acns.nwu.edu (Douglas Meier) writes:

>I asked earlier what the reaction was between H2O2 and flesh (i.e. why the
>bubbles) and got two responses.  

>1)  It breaks down into H20 and O2, with some O radicals reacting with the
>skin.

>2)  Oxidation reaction where H2O and CO2 are the gases given off.

>Now I know that H2O2 can be an oxidizing agent or a reducing agent, dependent
>on the conditions, but I don't know which way this reaction occurs under
>conditions of H2O2 reacting with organic materials.  

>Any more suggestions?


	Could be the presence of some small amount of catalase on the skin
surface, disproportionating H2O2 to water and oxygen.  There's certainly
a lot of catalase in blood, or ground tissue.

	Annette
	dexter@aries.scs.uiuc.edu
Newsgroups: sci.chem
From: arc5@chempc0.york.ac.uk (Alastair Cargill)
Subject: Catalytic converters for cars - good or bad?
Keywords: Catlytic, ecology, greenhouse effect
Organization: University of York, UK
Date: Wed, 18 Nov 1992 22:07:01 GMT
X-Posted-From: chempc0.york.ac.uk
NNTP-Posting-Host: sol.ctr.columbia.edu

Hi

I have long wondered about the balance between the good a catalytic 
converter does whilst in use on a car and the damage done to the environment 
as a whole involved in its production in the first place.
To make a catalytic converter involves the use of very rare and presumably 
hard to get at maetals such as rhodium and platinum and therefore to extract 
them from the rock/ore/whatever must be very energy intensive and must 
surely produce a lot of polution in this way. 
Does anyone have any feelings/figures on the relative balance of good vs. 
bad. One reason this is of interest to me is that a few years back the EEC 
(boo hiss) had to decide between compulsory catalytic converters and lean 
burn technology and went with the c.c. whereas it seemed more sound in the 
long term to opt for lean burn.

Cheers

Al
From: ce698@cleveland.Freenet.Edu (A. McPherson)
Newsgroups: sci.chem
Subject: Re: EPA studies
Date: 19 Nov 92 16:36:00 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: hela.ins.cwru.edu


thanks for the 800-445-2795 number (EPA documents).  unfortunately,
the number does not work from Canadian area codes.  does NTIS have
a similar number, just for interest sake.
From: gtd205a@prism.gatech.EDU (Hody Crouch)
Newsgroups: sci.chem
Subject: Re: Oil Spills
Date: 16 Nov 92 14:30:39 GMT
Organization: Georgia Institute of Technology

In article <92318.230825KRK4@psuvm.psu.edu> KRK4@psuvm.psu.edu (Kyle R. Krom) writes:
>
>  I've been reading about the efforts to clean up the Alaskan coastline
>since the Exxon Valdez incident, and was thinking...  what exactly is the
>major difficulty with cleaning up oil spills in the water?  It can be
>reasonably contained, and it floats on the top, so why can't it be scooped
>up somehow?  Please feel free to elaborate a bit, since I have several
>questions, depending on the responses to this basic problem.

Well, the method that you suggest cleaned up the vast majority of the spilled
oil.  The coast guard and other organizations put out large booms and the oil
was 'skimmed' off the top of the water.  Here are the main problems.
  1.  Some of the oil reached land, where it coated the shoreline, and any 
animal on it.  Once on the shore, oil becomes extremely difficult to clean up.
And even if it is cleaned up, much damage has already been done.

  2.  Oil also begins to spread through the water.  The oil molecules attract
H2O, and when enough water molecules surround a small oil molecule, it can 
'dissolve' (used in the loosest sense of the word).

Those are the only big problems I can tink of right now... hope it helps.


-- 
_________________________________________________________________________
Hody Crouch     | Georgia Tech       | Internet: gtd205a@prism.gatech.edu
Chemistry Major | Atlanta, GA 30332  | Snail Mail: 34353 GT Station
________________|____________________|___________________________________
Xref: sparky sci.chem:4788 rec.pyrotechnics:3829 rec.models.rockets:3074
From: cdt@sw.stratus.com (C. D. Tavares)
Newsgroups: sci.chem,rec.pyrotechnics,rec.models.rockets
Subject: Re: H2O2/UDMH/RFNA propellant suppliers in Los Angeles Area?
Date: 23 Nov 92 18:37:21 GMT
Organization: Stratus Computer, Inc.
NNTP-Posting-Host: rocket.sw.stratus.com

In article <1ekh8sINN79u@neuro.usc.edu>, merlin@neuro.usc.edu (merlin) writes:
> We need a more or less
> decent propellant for our small liquid fueled model rocket project.

> Has anyone had experience filing permits required for launching our
> model rocket with the FAA, the AQMD, and/or anyone else who may care?

Be a nice chap and don't misuse the term "model rocket" when you are talking
about something that is not legally a model rocket.  It will not only keep
the politicos happier with us, but will save you from a lot of grief when 
you discover that all those "easy" laws and regulations you carefully complied
with for "model" rockets didn't do you any good after all.

"Model" rockets are legally defined for federal and (most) state laws by
NFPA 1122.

"Model" rockets are legally defined for the FAA under FAR 101.1.

In short: non-metallic, with pre-manufactured solid-fuel engines, massing 
under 453 grams (FAA) or 1500 grams (NFPA), safe recovery provisions, and
several other criteria.
-- 

cdt@rocket.sw.stratus.com   --If you believe that I speak for my company,
OR cdt@vos.stratus.com        write today for my special Investors' Packet...
From: ps02@ns1.cc.lehigh.edu (PENELOPE E. SMITH)
Newsgroups: sci.chem
Subject: Re: Why Not ? (Re: Ethanol fuel
Date: 18 Nov 92 22:55:19 GMT
Organization: Lehigh University

In article <1992Nov17.151835.9640@ucsu.Colorado.EDU>, smithrs@ucsu.Colorado.EDU
(SMITH  RANDALL SCOTT) writes:
>In article <1992Nov16.193013.42100@ns1.cc.lehigh.edu> ps02@ns1.cc.lehigh.edu (P
ENELOPE E. SMITH) writes:
>> I want my car to run on carbohydrates...

>The most recent _Chemical and Engineering News_ had a short blurb on a recent
>successful test of vegetable oil being used as fuel...

I was thinking more of a fuel cell generating electricity, but this is very
nice! (Gasoline is quite poisonous - ever notice how the folks pumping the gas
are always changing and don't stay smart? - NJ is nice, since all gas is full
service).

-- 
 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Penelope E. Smith               PS02@NS.CC.LEHIGH.EDU
Department of Mathematics       PS02@LEHIGH.BITNET
Lehigh University
Bethlehem, PA
Organization: Penn State University
Date: Tue, 17 Nov 1992 02:30:33 EST
From: Kyle R. Krom <KRK4@psuvm.psu.edu>
Newsgroups: sci.chem
Subject: Re: Oil Spills

  As the original poster, I think I should clarify ...

  Obviously, the hardest part of cleaning up the oil at this point is
  the oil washed up on shore, but if it is easily retrieved from the
  water's surface, as some have claimed, then it should not necessarily
  be able to make it to the shore.  Let me put it like this: if a spill
  were to occur in the middle of the ocean, could it be entirely (or
  even mostly) cleaned up?  I should also say in response to certain
  replies so far that:

      1.   Oil molecules, being mostly alkanes, having an attraction
           for water molecules is a novel concept for me.  Are there
           perhaps specific additives causing this?
      2.   If emulsion form, I would have thought that a mixture of
           oil (which floats on water) , water, and air would float
           rather than sink.  If not, then why not?
      3.   If oil is able to pass by a floating retainer just because
           it thins out to monolayer thickness, then surely a float
           which extends a few feet under the surface would prevent
           this loss?

   I don't mean to be a pain in the neck, but I'm serious about this.
Newsgroups: sci.chem
From: rolfe@dsuvax.dsu.edu (Tim Rolfe)
Subject: Re: ANSWER TO: Where can we buy C60?
Organization: Dakota State University
Date: Mon, 23 Nov 1992 20:35:57 GMT

#smiley ON
C12, C13, C14 I can understand, but C60 ?!?!?!?!?!
#smiley OFF
(Yes, I DO know what's being discussed, but it DID catch my eye the
wrong way at first!)
-- 
                                              --- Tim Rolfe
                                           rolfe@dsuvax.dsu.edu
                                            ROLFE@SDNET.BITNET
From: kniaz@sol1.lrsm.upenn.edu (Chris Kniaz -Fischer)
Newsgroups: sci.chem
Subject: Re: Bucky things
Date: 23 Nov 92 20:02:44 GMT
Organization: Laboratory for Research on the Structure of Matter, University of Pennsylvania

In article <1992Nov21.212953.12971@netcom.com> ckp@netcom.com (Charles Pooley) writes:
>
>In all the discussions of properties of fullerenes, has anyone heard of
>determinations of a melting point?  of triple point pressure?  of
>determinations of vapor pressure at temp up to 2000 C (ie, by Langmuir
>or Knudsen method)?
>
>From the literature, it looks like , say, C60 should have a melting point
>below 3000 C and a low t.p. (< 1 bar).    Any info, rumors?  Why so little
>said on the subject???

The main problem here is the reactivity of carbon at high temperatures.
Most of the metals react with carbon giving carbides, so one has to 
find something resistant to carbon at 2000C, make a capillary of it, put
the c60 powder and do some X-ray. Simple isn't it?


-- 

Krzysztof Kniaz, Penn |If only God would give me some clear sign! 
LRSM ,                |Like making a large deposit in my name at a Swiss bank.
Phila, PA, 19104, USA |               Woody Allen
Newsgroups: sci.chem
From: stngiam@athena.mit.edu (Shih-Tung Ngiam)
Subject: Potassium Alum and Chrome Alum
Organization: Massachusetts Institute of Technology
Distribution: usa
Date: Tue, 17 Nov 1992 17:56:52 GMT


  I'm looking for Potassium alum and chrome alum for crystal growing,
but since both of these are used in b/w photo developing, I thought I
would try to find them at photo supply stores.  Unfortunately, I've had
no luck with any of the companies I called.  Does anyone know of any
mail order supply houses that sell these chemicals?
  Thanks a lot!

Shih Tung
Newsgroups: sci.chem
From: singley@helix.nih.gov (Erick Singley)
Subject: Re: GRE Studying Tips?
Organization: (National Institutes of Health, Bethesda, MD)
Date: Mon, 23 Nov 1992 23:03:02 GMT

Speaking of this, what about the Bio-Chem GRE.  Last I heard, this GRE specific
for biochem came out fairly reciently (last year?)  Any word on how this
went/ waht to focus on? (The topics to look at, according to the registration
were Biochem, Cell, and Genetics) Absurdly basic [well, relativly :) ] or
downright specific in names/dates/structures/functions?  Should I know
the function and breakdown product of the major catecholamines or do I 
just need to know what on is for in general and structure?  Anyone have a grasp
on this particular GRE? (Or maybe this is better in .bio....)
Erick

--
singley@clinpharm.niaaa.nih.gov
Newsgroups: sci.chem
From: aflorjan@magnus.acs.ohio-state.edu (Alan S Florjancic)
Subject: EMail Address Wanted
Organization: The Ohio State University
Distribution: sci.chem
Date: Tue, 24 Nov 1992 00:57:31 GMT

I am looking for the E-Mail address of anyone in K. Barry Sharpless's research 
group.  I had been in contact with a post-doc in his group about a month ago, 
but subsequently lost his address.  It seems that a post I made regarding the 
AD process got sent to this person, and was wondering if the person who 
forwarded the post could do the same.  Thanks for any help

Alan S. Florjancic
The Ohio State University
From: whitbeck@equinox.unr.edu (Michael Whitbeck)
Newsgroups: sci.chem
Subject: Re: Why Not ? (Re: Ethanol fuel
Date: 17 Nov 92 18:10:09 GMT
Organization: University of Nevada, Reno

In article <16NOV199203062910@rigel.tamu.edu> mjf9968@rigel.tamu.edu (Pi(3.143832666)) writes:
>In article <1992Nov15.201346.9786@ucsu.Colorado.EDU>, smithrs@ucsu.Colorado.EDU (SMITH  RANDALL SCOTT) writes...
>	Such as?  I don't mean this as a flame, just an honest
>	question.  The much praised act in California which
>	requires auto manufactorers to sell cars which run on
>	electricity does basically nothing to help pollution
>	problems.  Most electricity in the US is made from burning
>	fossil fuels, so electric cars don't solve air pollution,
>	they just move it out of the city.
>

It may depend in part on your perspective. Shifting from HC
fueled cars to electrics shifts the location of the pollution
source. This has 3 significant impacts
1) moves source from city to rural areas (usually but not
always)
2) source operates at lower total pressure; less NOx than a car
engine would give at 8:1 compression ratio (but also possibly
more SOx)
and 
3) source is now stationary- cheaper and more effective
pollution control options can be invoked. On the down side
there might be a lot more CO/CO2 generated per mile given the
likely efficiency loss for
fuel->electricity->battery->motor->motion.

Of course in the final analysis there is still pollution being
generated; I see no way around it. After all if you walk instead
of ride you will expell CO2, work up an appetite, eat more food,
more tractors running to make food for those hungry hikers, more
fertilizer production, shoes wear out faster- shoe factories (in
korea?) gear up.....I may have just discovered what makes the
planet spin! :-)



Mike
Newsgroups: sci.chem