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keziakeren17

Agustus 18, 2014, 07:14:43 PM
gk ada yg mau jwb pertanyaan ku di topik
 

reborn

Agustus 18, 2014, 06:47:27 PM
@keziakeren17 bisa post di http://www.forumsains.com/fisika/ atau http://www.forumsains.com/fisika-smu/ ,. Selamat bergabung!

keziakeren17

Agustus 18, 2014, 06:39:36 PM
ada yg bisa bantu jwb soal fisika??

pandu.rengga

Agustus 16, 2014, 08:12:48 PM
ehm, ada yg tau gk caranya jwb soal mtk yg ini 1125000 = 2p.3q.5r nah p,q dan r brp? saya kgk tahu itu< tolong saya yah plissssss

imad323

Agustus 14, 2014, 06:35:28 AM
Buku referensi luar yang bagus untuk kimia fisika biologi sma apa ya?

lisnawati

Agustus 14, 2014, 12:05:05 AM
ada yang bisa bantu aku gak?
 ;D

merykallen

Agustus 10, 2014, 06:35:28 PM
tema,alur,setting,tokoh/penokohan dan amanta dari cerpen JURU MASAK?

graveworm

Agustus 09, 2014, 08:16:01 PM
salam kenal semuanya...
 

Monox D. I-Fly

Agustus 07, 2014, 09:37:59 PM
sebenarnya di inti bumi itu terang atau gelap?
 

Monox D. I-Fly

Agustus 07, 2014, 09:17:53 PM
sebenarnya di inti bumi angkasa itu terang atau gelap?

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Penulis Topik: The Smell of Money  (Dibaca 2947 kali)

0 Anggota dan 1 Pengunjung sedang melihat topik ini.

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The Smell of Money
« pada: Maret 04, 2007, 05:08:01 PM »
The Smell of Money

It's not hard to recall the pungent scent of a handful of pocket change. Similar smells emanate from a sweat-covered dumbbell or the water emerging from an old metal pipe. Yet no one has been able to identify the exact chemical cause of these familiar odors.

Now, researchers supported by a National Science Foundation (NSF) MUSES award and the UFZ Environmental Research Center in Germany have shown that these odor molecules come not from the penny or the pipes, but from metal-free chemicals erupting into the air when organic substances like sweat interact with the metallic objects.

The researchers--Andrea Dietrich, Dietmar Glindemann, Hans-Joachim Staerk and Peter Kuschk, all from Virginia Tech in Blacksburg--published their findings in the Oct. 20, 2006, Angewandte Chemie International Edition.

"We are the first to demonstrate that when humans describe the 'metallic' odor of iron metal, there are no iron atoms in the odors," said Dietrich. "The odors humans perceive as metallic are really a body odor produced by metals reacting with skin."

Because the makeup of byproduct molecules depends on which organic substances are reacting, the researchers believe the findings could help identify problem odors in potable water or aid doctors searching for disease markers in sweat or other body fluids.

The study, which focused mainly on the reactions of biological fluids with iron, also examined the scents emanating from iron in blood.

"We speculate that the 'blood scent' may result from skin reacting with ferrous iron because the same 'metallic' odor is produced if you rub blood on skin," said Dietrich.

One of the chemicals produced in the reaction is 1-octen-3-one, which has a mushroom-metallic smell and very low odor threshold, meaning that humans can smell it in extremely minute concentrations.

"This may have provided an evolutionary advantage that allowed early humans to track wounded comrades or prey," Dietrich added.

Baca :

- Virginia Tech press release:
- Angewandte Chemie International Edition article



 

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