Smell of etheral stink
Published 05.09.2020 в Mohu leaf placement tips for better
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What is puzzling, though, is how this first binding step works — most odorants are hydrophobic, while the mucus covering the ORs in the nose is aqueous. Scientists have assumed that another species becomes involved to help shuttle the odorant through the mucus layer: an odorant binding protein OBP. The main quality of a chemical compound that enables us to smell is its volatility.
The compound should have a relatively low vapor pressure that allows whiffs of it to escape from its container and interact with the biochemical sensory switches inside our body. A lot of organic compounds have this quality so most young chemists encounter some kind of smell during their freshman or sophomore chemistry lab. As a newbie, it can be confusing to smell certain compounds that we end up confusing our senses.
We have to remember that human nose is not that good in sensing odour. If we could, I am sure we would find the smell of the armpit odor seductive. Recently, while conducting practicals on microscale separation of organic compounds from a binary mixture made me think about the smell of organic compounds. One of my students started sniffing in full curiosity to identify the separated compound with just a whiffy smell.
It is obvious for him to instinctively start sniffing without realizing the toxic reactions. I reached his table to make him and his colleagues aware of the harmful effects of smelly-nonsmelly organic compounds. It also led me to an idea to put up a chart on the same matter and will be completing it soon.
During the early days of chemistry, when there were no techniques for determining the structure and identities of molecules, colour and smell were the two main qualities on which chemists could rely on for identifying specific compounds. Even forensic investigators often identified the presence of poisons by their smells. For instance arsenic has a garlic-like smell, and hydrogen cyanide smells mildly of bitter almonds.
And yes, I so love the smell of bitter almonds! Unfortunately not all poisons have a compelling odor. Sarin gas is another example from the lot. Researchers came up with idea of spiking the noxious gas with smelly compounds, like natural gas, a potentially dangerous odorless agent can be spiked with minute concentrations of a highly smelly additive methane thiol.
This brings us to thiols, bad smelly skunks. If you ask chemists to universally agree upon one element in the periodic table under the title of king of bad smells, they will affirmatively settle on sulphur, especially in the form of thiols. Thiols — also called mercaptans — are compounds with a sulfur bonded to a hydrogen, an atomic combination denoted by SH. Yes, the very own skunky smell and flatulence.
These compounds, along with related thioethers like dimethylsulfide, are also characterized by their extremely noxious odors reminiscent of rotting eggs, overcooked cabbage, sweat, diesel fumes and a host of other foul aromas at anything above the lowest of concentrations.
H2S contributes to the classic smell of rotten eggs-Some Kitchen Chemistry here. The apparatus contained a few filings of iron sulfide in hydrochloric acid. The reaction between these two generated the gas which we would bubble into test-tubes for semi-micro inorganic analysis. On a quick literature survey, I came across some great snippets on Odor Chemistry. The worst smell ever recorded that led to evacuation of German city, Frieberg when workers at the Esso Research Station in England were trying to make thioacetone from trithioacetone.
The odours defied the expected effects of dilution since workers in the laboratory did not find the odours intolerable … and genuinely denied responsibility since they were working in closed systems. To convince them otherwise, they were dispersed with other observers around the laboratory, at distances up to a quarter of a mile, and one drop of either acetone gem-dithiol or the mother liquors from crude trithioacetone crystallisations were placed on a watch glass in a fume cupboard.
The odour was detected downwind in seconds……….. To work up such a reaction will be a daunting task for a chemist. Damascenones are responsible for the smell of roses. If you smell one drop you will be disappointed, as it smells rather like turpentine or camphor, but next morning you and the clothes you were wearing will smell powerfully of roses. Just like the compounds from trithioacetone, this smell develops on dilution. Everyone relishes garlic bread but even one bite later you realize that not just your mouth but even your sweat smells like garlic.
Garlic is made up of sulphuric compoundsthat render the pungent smell to it. Another 1. In a New York Times story, a woman suffered a succession of unpleasant phantom odors , from dank earth to burnt chili. When antibiotics failed to treat the condition, she simply learned to live with it — and avoid disagreeable odors. Even if there is no underlying tumor, epilepsy or some other infection, problems with your sense of smell can be very disabling.
Furthermore, doctors will often treat it like a psychiatric problem, with patients visiting an average of seven physicians before getting help, says Hirsch. The irony is, some people with phantosmia will develop psychiatric disorders, depression or suicidal behavior as a result of their condition. Sometimes people think the stink is coming from themselves, which can lead to a condition known as olfactory reference syndrome, says Hirsch.
The weird science behind PSL.
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All of these materials find their way into the drain, where they are flushed down into warm, dark pipes. It just so happens that these pipes provide the perfect environment in which bacteria can grow and flourish. Over time, this buildup of bacteria may result in nasty, black gunk, called biofilm. And that biofilm can sometimes emanate a fairly unpleasant smell. Simply disconnect the stopper, pull it out, and see if the underside of it is covered in black film. If it is, then that means your pipes are, as well.
The good news is that the smell caused by biofilm is pretty easy to eliminate; more on that later in the post. Well, that may be because it is. The sewer smell could point to a deeper problem with your plumbing system, including sewer gas rising up through your drain. A Problem with Your Vent Plumbing systems come equipped with vents, which let that nasty sewer gas escape rather than getting trapped in your home.
A Dry P-Trap The alternative is that there is a problem with the p-trap. This is the U-shaped segment of pipe you see under the sink. The role of this p-trap is to hold a protective barrier of water, which keeps sewer gases from wafting up through the pipes and into your bathroom.
If the p-trap goes dry, however, then you no longer have that barrier to keep sewer gases from drifting up into your home. Not only can this be extremely unpleasant, but it can actually be highly unsanitary, as well. Over time, the p-trap may simply go dry. This is an extremely easy fix; more on that shortly! Clean Your Sink to Remove Biofilm Buildup We mentioned earlier that one possible cause of a smelly drain is biofilm buildup.
If so, that means all you really need to do is thoroughly clean out your sink, including a deep-clean down through the drain and into the pipes. So what cleaning supplies should you use to clean out your biofilm buildup?
You can also just use vinegar preferably white, distilled vinegar. One important word of caution: Never mix vinegar with bleach. Doing so can produce noxious, potentially dangerous fumes. This can further break down and flush away bacteria. If your bacteria buildup is really extreme, this method of cleaning may not be sufficient.
In this situation, you may want to turn off the water source, take apart the plumbing under your sink, and clean out each pipe individually. You can usually do this easily enough by using a paper towel inside each pipe. You can also rinse them out with an outdoor faucet or hose. Add Water to Your P Trap What course of action is best if the cause of your sewer smell is a dry p trap?
This may be an even easier fix. Fix Your Ventilation The third issue we discussed was a faulty ventilation system, allowing sewer gases to get trapped in your home and waft up through the drain. This is a more complex problem and may require some deeper repairs to your home plumbing system. Allow us to provide a few additional strategies for diagnosing and removing a bad bathroom smell. Check the Overflow Pipe Do you see a small hole, located toward the top of your sink? The overflow is actually a magnet for soap scum and other forms of buildup, and over time, you may get some unsatisfactory smells coming out of this little hole.
You can clean this out by pouring vinegar or even a household bleach down the hole. You might also buy a small toothbrush, or some other kind of brush, to scrub out the inner rim of the overflow hole. Address Buildup in Your Pipes We already mentioned the possibility of biofilm accumulating in your pipes. In addition to vinegar and boiling water, another way to clean out the sink drain and remove foul smells is to use a combination of baking soda and vinegar.
This mixture produces a combustible effect that can dislodge the build-up and unclog your drain… which may, in turn, remove the smell. While this is most common in the kitchen sink or garbage disposal, where food particles can build up over time, it may sometimes happen elsewhere in the home. And yes, I so love the smell of bitter almonds! Unfortunately not all poisons have a compelling odor. Sarin gas is another example from the lot. Researchers came up with idea of spiking the noxious gas with smelly compounds, like natural gas, a potentially dangerous odorless agent can be spiked with minute concentrations of a highly smelly additive methane thiol.
This brings us to thiols, bad smelly skunks. If you ask chemists to universally agree upon one element in the periodic table under the title of king of bad smells, they will affirmatively settle on sulphur, especially in the form of thiols. Thiols — also called mercaptans — are compounds with a sulfur bonded to a hydrogen, an atomic combination denoted by SH.
Yes, the very own skunky smell and flatulence. These compounds, along with related thioethers like dimethylsulfide, are also characterized by their extremely noxious odors reminiscent of rotting eggs, overcooked cabbage, sweat, diesel fumes and a host of other foul aromas at anything above the lowest of concentrations. H2S contributes to the classic smell of rotten eggs-Some Kitchen Chemistry here. The apparatus contained a few filings of iron sulfide in hydrochloric acid.
The reaction between these two generated the gas which we would bubble into test-tubes for semi-micro inorganic analysis. On a quick literature survey, I came across some great snippets on Odor Chemistry. The worst smell ever recorded that led to evacuation of German city, Frieberg when workers at the Esso Research Station in England were trying to make thioacetone from trithioacetone. The odours defied the expected effects of dilution since workers in the laboratory did not find the odours intolerable … and genuinely denied responsibility since they were working in closed systems.
To convince them otherwise, they were dispersed with other observers around the laboratory, at distances up to a quarter of a mile, and one drop of either acetone gem-dithiol or the mother liquors from crude trithioacetone crystallisations were placed on a watch glass in a fume cupboard.
The odour was detected downwind in seconds……….. To work up such a reaction will be a daunting task for a chemist. Damascenones are responsible for the smell of roses. If you smell one drop you will be disappointed, as it smells rather like turpentine or camphor, but next morning you and the clothes you were wearing will smell powerfully of roses. Just like the compounds from trithioacetone, this smell develops on dilution. Everyone relishes garlic bread but even one bite later you realize that not just your mouth but even your sweat smells like garlic.
Garlic is made up of sulphuric compoundsthat render the pungent smell to it. Also, when we put garlic in our mouth, it encourages the growth of certain bacteria that is already present in our mouth. This leads to bad breath. Garlic contains allyl methyl sulphide, which is the reason for the pungent smell. It passes into our blood stream during the digestion process. Once it is in our body, it gets to the pores of our skin and when we sweat, it gets expelled and causes the sweat to smell.
The allyl methyl sulphide also enters our lungs and contaminates the air inside. As we breathe, the air enters our lungs, gets contaminated and comes out as we exhale. This is why our breath smells. The effect of this chemical lasts for few hours but the bad breath and body odour will continue till it is completely thrown out of our system by way of sweat or excreta.
Durians have a notorious aroma likened to rotting meat, turpentine and gym socks. It can be smelled from yards away. In breaking down aroma extract, taken from Thai durians, with a mass spectrometer and gas chromatograph, the team, led by Jia-Ziao Li, pinpointed 50 discrete compounds in the fruit responsible for its uncommon aroma.
A number of them have been detected in just a few other substances, such as cooked beef, yeast extract, dried squid and leeks. Somehow, the combination of these 50 chemicals produces the powerful scent that has entranced and repulsed people the world over.
However, there are innumerable examples of chemical reactions giving pleasant odors too. Maillard reaction is a form of non-enzymatic browning- a chemical reaction between an amino acid and a reducing sugar, usually requiring heat.
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