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aji saka

Juni 28, 2015, 06:41:58 AM
terima kasih admin.sy bisa gabung di forum sain ini,semoga teman temin yg dah lama salam kenal semoga banyak kebaikan di forum ini,salam dari aji saka ciawi bgr ;D

sylvieaulia

Juni 27, 2015, 08:25:42 AM
kalau mau tanya soal dimana yaa??

timusyume

Juni 20, 2015, 03:18:40 PM
Nyimak

masagung

Juni 16, 2015, 11:03:06 PM
Saya tak hanya menggunakan semua kecerdasan yang dimiliki otak melainkan juga yang dapat saya pinjam. Reference Woodrow Wilson Agen Bola Sbobet

masagung

Juni 16, 2015, 10:59:44 PM
Seorang pendengar yang baik mencoba memahami sepenuhnya apa yang dikatakan orang lain. Pada akhirnya mungkin saja ia sangat tidak setuju, tetapi sebelum ia tidak setuju, ia ingin tahu
dulu dengan tepat apa yang tidak disetujuinya. (Kenneth A. Wells) Bila orang mulai dengan kepastian, dia akan berak

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Salam kenal gan, mohon bimbingan agan semua.
 

MuhammadRyan

Juni 02, 2015, 10:44:42 PM
Mengenai suara sangkakala di belahan bumi utara, bsa diangkat ke diskusi? Kayaknya avdol  :D
 

MuhammadRyan

Juni 02, 2015, 10:19:01 PM
bisa, senyawa yg bersifat korosif kyk HCL 3% bsa nghancurin hampir smuany, bhkn logam

HeldaParamitha

Juni 02, 2015, 08:42:18 PM
guys , mau nanya dong .. bisa gak sih ngehancurin kayu pake cairan kimia . mesti pake apa coba ? need help nih

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Juni 02, 2015, 08:42:17 PM
guys , mau nanya dong .. bisa gak sih ngehancurin kayu pake cairan kimia . mesti pake apa coba ? need help nih

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Penulis Topik: The Smell of Money  (Dibaca 3197 kali)

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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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