Sensation metallic

The metallic sensation arises from stimulation with certain metallic salts, such as silver nitrate, and is also associated with l-octen-3-one (30). Metallic taste sensations may also arise with pathologies of the glossopharyngeal nerve. 

Initial pain at the site of the bite may be followed with a metallic sensation in the mouth. Victims may become weak, and experience nausea, diarrhea, diaphoresis, and chills. Edema may begin around the bite area or may be delayed. Observation of the site for edema is a clue as to whether or not a dry bite has occurred that is, that no venom was injected into the site. Envenomation is most serious if venom is injected directly into joints, muscles, or veins. Hemorrhagic blisters and tissue destruction are possible. Neurotoxicity from rattlesnakes (but generally not from cottonmouths or copperheads) may be manifested as fasciculations, which are fine continuous contractions. In some cases, systemic neurotoxicity may involve respiratory failure. In the most serious cases, massive envenomation may lead to serious bleeding, hypotension, shock, multiple organ failure, and a high incidence of mortality. 

Last but not least, it must be mentioned that sodium chloride (often referred to as the poor man s flavour enhancer ) has a flavour enhancing effect at usage levels below and above its taste threshold (370 to 5000 ppm). Without salt, many foods (both sweet and savoury) have a flat taste. Salt may enhance sweemess and mouthfeel and decrease bitter, sour and metallic sensations [4, 32]. Even in sweet foods such as cakes, candies and toffees, salt has its place. However, its presence is most critical for... 

Reflect and Apply A friend who is trying to lose weight complains about the odd taste in his mouth in the mornings. He says it seems like a filling has broken loose, and the metallic sensation is bothersome. What would you say ... 

Pleasant is associated with the small fibre geniculate ganglion system and is evoked by lactones and similar carbon-oxygen compounds. Umani is a Japanese word used to describe the sensation elicited by the amino acid monosodium glutamate and the nucleotides sodium inosinate and sodium guanylate. The metallic sensation is produced by certain salts such as silver... 

Most people have at some time experienced a severe pain in their teeth after accidentally eating a piece of sweet wrapper. Those teeth that hurt are usually nowhere near the scrap of wrapper. The only people who escape this nasty sensation are those without metal fillings in their teeth. 

Figure 7.1 Schematic illustration of the electron cycles that ultimately cause a sensation of pain in the teeth in people who have metallic fillings and who have inadvertently eaten a piece of aluminium ( silver ) foil, e.g. while eating sweets...

Kirchhoff s and Bunsen s results created a sensation within the scientific community. Soon scientists throughout Europe were using spectroscopes in their research. Inevitably, some of them found yet more new elements. In 1861 the English chemist and physicist William Crookes discovered thallium, a heavy metal, in a sample of clay. In 1863 two German chemists, Ferdinand Reich and Hieronymous Richter, discovered another new metal, which they called indium. And in 1868 the French astronomer Pierre Jannsen observed the sun with a spectroscope during an eclipse and discovered the spectral lines of a new element, helium, in the sun s atmosphere. This was an especially sensational discovery, because helium had never been observed on Earth. 

Early signs of overdosage are manifested as weakness, headache, somnolence, nausea, vomiting, dry mouth, constipation, muscle and bone pain, and metallic taste sensation. 

GI disturbances (nausea, GI distress, metallic taste sensation), photosensitivity Rare... 

Gastrointestinal (Gl) disturbances, such as nausea, and a metallic taste sensation. Rare... 

As we have already seen, there was throughout this period a steady increase in the materialization of the chemical elements, whether one believed in three, four, or five. In the case of fire the phlogiston concept is certainly in that pattern. But the chief ancestor lies in the even older tradition of the sulphur principle. The sensation of heat is seen as distinct from the particles of fire, which for many chemists, Boyle among them, were responsible for the increase in weight when metals were calcined. There is no problem in finding a source for Rouelle s idea of fire as occurring both fixed and free. 

The discovery of a new metal created a real sensation among chemists at the time, and many of the prominent chemists obtained specimens of the crude platinum metal... 

In 17%, Alessandro Volta observed that an electric current was produced if unlike metals separated by paper or hide moistened with water or a salt solution were brought into contact. Volta used the sensation of pain to detect the electric current. His observation was similar to that observed ten years earlier by l.uigi Galvani who noted that a frog s /eg could be made to twitch if copper and iron, attached respectively to a nerve and a muscle, were brought into contact. 

Sodium is a silver-colored metal that reacts violently with water. Even the humidity in the air can make sodium burst into flames. As a precaution, pure sodium metal is often stored in oil to keep the water in the air from getting to its surface. Chlorine, on the other hand, is a pale, greenish-colored gas that is so poisonous it was used as a chemical weapon in World War I. When it is inhaled, chlorine gas causes chest pains and a burning sensation in the throat. It can destroy lung tissue and victims die of suffocation because they cannot breathe. 

During almost one and half century, the chemistry of metal hydrides demonstrated many interesting and instructive circumstances. We can see both experimental successes (natural and accidental) and unrealized expectations both scientific clear-headings, successful prognoses and theories (models) which proved to be unsound mistakes - conscientious or not both persistent searches of truth (effectuated sometimes by the tests-and-mistakes way) and anti-science in its different manifestations - up to falsifications. Here sensations also can be seen -both true and false. 

The false sensations appeared in the rather large quantity. In most cases they were related with the record and super-record hydrogen uptake by one or another metallic material. 

Thermal conductivity Everyone knows that touching a metallic surface at room temperature produces a colder sensation than touching a piece of wood or plastic at the same temperature. The very high thermal conductivity of metals allows them to draw heat out of our bodies very efficiently if they are below body temperature. In the same way, a metallic surface that is above body temperature will feel much warmer than one made of some other material. The high thermal conductivity of metals is attributed to vibra-... 

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