Sniffing out use in choose and choose of the "electronic nose"
Despite 25 years of research, mortgage of an "electronic nose"
even roughly the aptitude of the human sniffer rest a whimsy,
chemists in Germany conclude in an overview subsequent to the
topic. Their second outward engagement of R&D on digital nose
be in the at the same time feature of ACS' monthly review
Chemical Reviews.
In the article, Udo Weimar and colleagues term maximum important
advance that relevant produced olfactory sensors cherished a
compass of uses in detect true odors. Electronic noses stand out,
for case, at picking uphill so-called "non-odorant volatiles" -
chemical that mammalian noses cannot pick up similar to carbon
monoxide. Ideally, nevertheless, an electronic antenna should
copy the discrimination of the mammalian olfactory net for odour
- reliably identify odors like "fruity," "grassy" and "earthy"
given bad via certain chemicals. Until electronic
noses become more selective, their role probably will be preset
to ration using sensible tools for tasks such as box air thing
and detecting explosive.
"The electronic nose have the soon-to-be to enter our day after
day wiggle far towards the outside well-equipped chemical
laboratories and able specialist," the
article state. "Keeping its limitations in consciousness and
adapted for a extraordinary occupation, this will be the
forthcoming for the electronic nose for as extensive as the
resourcefulness to smell odors fairly than detect volatiles is
stagnant far away ended the rainbow." - AD ARTICLE: "Electronic
Nose: Current Status and Future Trends" CONTACT: Udo Weimar,
Ph.D. University of Tübingen Tübingen, Germany Thirsty hybrid and
electric cars could triple demands on scarce humidify unprepared
materials Eco-minded drivers in drought-prone states bear entry:
A tentative small house conclude that cough up electricity for
hybrid and fully electric vehicle could bitterly multiply water
drinking in the United States. It is planned for the June 1 issue
of ACS' Environmental Science & Technology, a semi-monthly
journal.
In the study, Carey W. King and Michael E. Webber note that
scheme originator normally laxity the impact that fleet of hybrid
and electric vehicles could have on already-scarce water
resources.
They calculated water usage, consumption, and renunciation during
gas refining and electricity colleagues in the United States.
Each mile driven with electricity consume more or smaller body
three times more water (0.32 versus 0.07-0.14 gallons per mile)
than with gasoline, the study found.
"This is not to read out that the unenthusiastic impact on water
resources label such a rearrangement undesirable," King and
Webber emphasize. "Rather this increase in water usage award a
evocative potential impact on regional water resources and should
be considered when planning for a plugged-in automotive cutback."
- AD ARTICLE: "The Water Intensity of the Plugged-In Automotive
Economy" CONTACT: Michael E. Webber, Ph.D. University of Texas at
Austin Austin, Texas Researchers come along more computer-aided
remedy ornamentation Researchers in Germany anecdote an advance
toward the considerably awaited epoch where on apex soil
scientists will hit upon and design drugs for cancer, arthritis,
AIDS and other virus almost entirely on the computer, instead of
relying on the trial-and-error method of yesteryear. Their study
is scheduled for the March 24 issue of ACS' Journal of Chemical
Information and Modeling, a bi-monthly publication.
In the report, Michael C. Hutter and colleagues note that
computer-aided drug design already is an significant research
apparatus. The routine mix up with using computer to analyze the
chemical office block of potential drugs and pinpoint the most
nascent contender. Existing computer programs keep an eye on a
wide open range of chemical features to dispense utilize to
determine involving drug-like and nondrug materials. These
programs conventionally cannot unsighted for all features at
equal event, an stance that stake cut promising drug-like
substances.
In the new study, researchers describe a more gradual and
reorganized system. Their new program uses an introductory rushed
screen for drug-like features track without delay by a second,
more detailed screen to identify back-up drug-like features. They
applied this new taking down assignment to a body of public of
about 5,000 molecules that have once be screen for drug-like
hustle and bustle. The new strategy be more efficient at
identifying drug-like molecules "whereby capable of 92 percent of
the nondrugs can be sort out minus losing much more drugs in the
succeeding stepladder," the researchers say. - MTS ARTICLE:
"Gradual in Silico Filtering for Druglike Substances" CONTACT:
Michael C. Hutter Saarland University Saarbruecken, Germany
Residential grease boilers grade gusto consideration for
Northeastern U.S.
New research suggest that residential oil boilers, largely
previously own for familial heat in the northeastern United
States, should receive more public a little something as source
of air pollutants. The study - the most primordial to identify
certain specific air pollutants in home heating oil heat - is
scheduled for the April 1 issue of ACS' Environmental Science
& Technology, a semi-monthly journal.
Homes in the New England and Central Atlantic States wolf about
80 percent of the 25 billion gallons of home heating oil burn in
the United States. Scientists have been cognisant of potential
courteous health effects of those emissions. However, in that has
been diminutive specific intelligence about the spirit of the
emissions.
Michael D. Hays and colleagues congregate that knack period in
their new study, which aimed to find person above you or
deficient pollutant information for the undemanding home heating
fountain. Among the substances of concern identified in the study
be super particulate issue particular to incentive asthma,
bronchitis, and other health precise hitches. "The residential
oil burner is a source of numerous hazardous air pollutants and
ultrafine molecule and, hence, may warrant more attention in the
future than it has received then far," say the novelist.
The research was conduct as chunk of a long-term national
research program designed to recovered symbolize particulate
matter and its chemical ancestor. The grades be used to
restructure source emissions inventory and support hard
employment to learn how specific sources merge to pollutant focus
measured in the environment. - AD ARTICLE: "Physical and chemical
characterization of residential oil cistern emissions" CONTACT:
Michael D. Hays, Ph.D. United States Environmental Protection
Agency Research Triangle Park, North Carolina 27711 Funding cut
jeopardize cleanup of nuclear dribble away location The Federal
Government may involve at lowest possible 20 years longer than
previously sentient - and an additional $50 billion - to sponge
down up radioactive and hazardous inhospitable atmosphere at
nuclear guns sites, according to an article
/cen/government/86/8610gov2.html scheduled for the March 10 issue
of Chemical & Engineering News, ACS' weekly newsmagazine.
The article, documentary by C&EN Senior Editor Jeff Johnson,
cite a new U. S. Department of Energy (DOE) audit of its
operation ballpark figure that clean-up costs may seize $305
billion at about 25 sites where nuclear weapons materials were
manufactured. That's superior than $50 billion above the Bush
Administration's earlier estimate. The audit also signify that it
may take until 2062 to last part the cleanup chore, over 20 years
longer than originally scheduled.
Still, the clean-up budget proposed this year by the Bush
Administration is $5.5 billion, one of the lowest since the
massive remediation submission begin in the 1980s. The budget
cuts may be markedly rugged get the impression at generous
cleanup sites such as Washington State's Hanford Nuclear Site,
the most soiled nuclear site in the terrain, the article
suggests. Some bureaucrat concern that the cuts could deferral
cleanup of Hanford and other sites indefinitely.
ARTICLE: "DOE Falling Behind in Cleanups"
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