The luciferin oxidizes to oxyluciferin which has the same chemical properties as the luciferin itself and may be reduced to luciferin again by reducing substances in luminous and other animals or by inorganic reducing agents.
The reason for this is that luciferin oxidizes even in absence of luciferase and will then no longer give light with luciferase.
Luciferin is the heat resistant, dialyzable substance which takes up oxygen and oxidizeswith light production in the presence of the heat sensitive, non-dialyzing, enzyme-like luciferase.
On the other hand, the light may be purely chemical, due to the oxidation of some compound, an abnormal incompletely oxidized product of metabolism, which oxidizes spontaneously in the air.
We know that sometimes these errors in metabolism occur, as in alkaptonuria, where homogentistic acid is excreted in the urine and on contact with the air quickly oxidizes to a dark brown substance.
To bring this fact in line with what we have already said regarding reaction velocity and luminescence, we must believe that the Photinus luciferase oxidizes at a slower rate than the Photuris luciferase.
A colorless chromogen is formed, which oxidizesto the green pigment in the air.
In the presence of the perhydridase the oxygen of water oxidizes the aldehyde and the hydrogen set free reduces any easily reducible substance which may be present.
A similar case is presented by luciferin which oxidizes spontaneously (most rapidly in presence of alkali) without light production and only produces light when oxidized in presence of luciferase.
The yellow ochres may be easily rendered red or reddish brown by calcination in a reverberatory oven, which oxidizestheir iron to a higher degree.
In the air it oxidizes slowly, and gets covered with a crust of soda; but it does not take fire till it is made nearly red-hot; and then it emits brilliant scintillations.
The pigs of metal derived from the preceding melting are exposed, on the hearth of the furnace, to the action of the air, which oxidizes the iron and other foreign metals with which the copper is still contaminated.
This immersion slightly oxidizes the surface of the copper, and gives it a fine red colour.
Sodium amalgam reduces it to acenaphthone; chromic acid oxidizes it to naphthalic acid.
It oxidizes readily: exposure to air giving acrylic acid, nitric acid giving oxalic acid, bichromate of potash and sulphuric acid giving carbon dioxide and formic acid.
Chlorine oxidizes it to acetaldehyde, and under certain conditions chloral (q.
Dilute acids readily transform it into alcohol and aldehyde, and chromic acid oxidizes it to acetic acid.
One class of bacteria even oxidizes H in small amounts for its energy and uses the carbon dioxide of the air or traces of organic carbon in the air as a source of carbon for "building" purposes.
The hot, dry, finely divided material oxidizes so rapidly on contact with the air that it ignites.
Nitre oxidizes all the metals at a red heat, even gold and platinum.
The precipitate so obtained is a brown amorphous solid which readily oxidizes on exposure, and is decomposed by heat with liberation of hydrogen and formation of the sesquioxide.
The oxygen set free oxidizes the color substance, converting it into a colorless compound.
This is due to the fact that the water takes up a small amount of oxygen from the air, which gradually oxidizes the organic matter present in the water.
If the sulphuretted hydrogen be left exposed to the air for some time, it oxidizes to sulphuric acid, which, during and after evaporation, tends to destroy the alkaloid.
Heated in air, it oxidizesto white fumes of As{2}O{3}.
Potassium phenolate, C6H5OK, crystallizes in fine needles, is very hygroscopic and oxidizesrapidly on exposure.
Carbon bisulphide slowly oxidizes on exposure to air, but by the action of potassium permanganate or chromic acid it is readily oxidized to carbon dioxide and sulphuric acid.
The vapour of the air combines with the lead, and oxidizes its surface; but instead of becoming rusty, the surface becomes dull, and of a darker colour.
Because alloy (of some baser metal) is used to make it more hard and lasting; and this alloy oxidizes more quickly than silver itself.
Because the vapour of the airoxidizes its surface, and tarnishes it.
The occurrence of this secondary reaction is indicated by the darkening of the precipitate; and, since potassium bichromateoxidizes this mercury slowly, solutions in which it has been precipitated are worthless as iron determinations.
When the zinc is brushed over with this mixture it oxidizes the surface, turns black, and dries in from twelve to twenty-four hours, and may then be painted over without any danger of peeling.
It oxidizes at once, turns black, and resists the weak acids, rain, and the elements generally.
It is of a white color, like sodium; but oxidizes so rapidly as not to be kept in its pure metallic state.
In these cases itoxidizes and becomes potash, by abstracting oxygen from the air and water.
It oxidizes a manganese salt (free from chlorine) in the presence of nitric acid to a permanganate; this is a very delicate test for manganese.
Heating or exposure to sunlight reduces it to the red oxide; it fires when ground with sulphur, and oxidizes ammonia to nitric acid, with the simultaneous formation of ammonium nitrate.
After it has been melted down and brought to a red heat, the blast, admitted at the back, oxidizes the lead and drives the litharge formed towards the front, where it is run off.
Dilute nitric acid oxidizes it to acetic and oxalic acids, while potassium permanganate oxidizes it to acetone, carbon dioxide and oxalic acid.
Potassium permanganate oxidizesit to acetic acid and hydroxyisobutyric acid (A.
More important are Kekule's observations that nitrous acid oxidizes pyrocatechol or [1.
Bromine water oxidizes this substance to oxalic acid and tetrabrom-dichloracetone (5).
Chromic acid oxidizesit to acetic acid and carbon dioxide; potassium permanganate oxidizes it to pyruvic acid; nitric acid to oxalic acid, and a mixture of manganese dioxide and sulphuric acid to acetaldehyde and carbon dioxide.
It oxidizes and thus helps make tight margins, and is very useful at cervical margins; generally discolors, but not always, and does not discolor the tooth unless a carious portion has been left, and then only discolors that portion.
Potassium bichromate and sulphuric acid oxidize it to carbon dioxide and acetic acid, while alkaline potassium permanganateoxidizes it to carbon dioxide.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "oxidizes" in a variety of sentences. We hope that you will now be able to make sentences using this word.
