The Trenner-Lee formaldehyde disinfector is a good apparatus for disinfecting.
Specimens preserved in formaldehyde can be protected in the long term by adding hexamethylenetetramine (otherwise known as hexamine, the product of ammonia and formaldehyde) to the liquid.
Strong formaldehyde has a similar effect, but not as good.
A practical proportion is to add 100 grams of hexamine to a litre of concentrated formaldehydesolution (formalin).
The same applies if you have preserved them with anything that gradually produces acid; For example, formaldehyde gradually reacts with oxygen to produce formic acid.
Neither formaldehyde nor paraformaldehyde was present; hexamethylenamin was present but, the lozenges being neutral no formaldehyde is generated in contact with water or with the alkaline saliva.
Saliva-dissolved tablets, obviously cannot reach the nasal or tracheal mucosae directly; and the application of quickly acting concentrations of formaldehyde is out of the question.
The claimed absence of irritation indicates sufficiently the absence of efficient quantities of formaldehyde under clinical conditions.
The Formaldehyde molecule is locked up in it until solution in the saliva takes place, when the Formaldehyde is liberated in its nascent state and is therefore active without being irritant.
This altogether aside from the fact that hexamethylenamin, the basis of some of these tablets, does not liberate formaldehyde in the mouth, and for this reason alone would be quite useless for this purpose!
When dissolved in the saliva, Formamint Tablets liberate slowly Nascent Formaldehyde in a most active yet non-irritant form.
It is hardly necessary to remind physicians that the use of tablets containing hexamethylenamin or other formaldehyde compounds can neither cure respiratory infections, nor even confer protection against such infections.
These tablets differ from Hex-Iodin in that they really contain active formaldehyde and, therefore, possibly produce antiseptic effect in test-tube cultures.
To be effective, formaldehyde would need to be supplied to the entire respiratory tract continuously for some time or else in concentrations that would be distinctly irritant and damaging to the tissues.
Chemical Laboratory reported that Cin-U-Form Lozenges contained some formaldehyde (or paraformaldehyde) and no hexamethylenamin.
Protective Vulnerary, forming a film from which formaldehyde is gradually liberated, thus persistently disinfecting the wound-surface.
Formaldehyde (which in 40% water solution forms the formalin of commerce) in milk affords a bright purple colour when the milk containing it is mixed with sulphuric acid containing a trace of an iron salt.
OH-- is a species of internal oxidation which reverses the reduction of formaldehyde groups in synthesising to sugars, and appears therefore of probable occurrence.
Strehlenert has proposed the addition of formaldehyde (19), but this is without result (20).
Many observers have decried formaldehyde on account of its professed lack of penetrating power.
The product gently heated with formaldehyde yields a brown, water-soluble condensation product; once condensation is complete, the product will stand stronger heat.
Naphthol condensed with hydrochloric acid and formaldehyde yields a methylenedinaphthol, which is insoluble in water; the sodium salt, however, easily dissolves.
If one-sixth of its volume of formaldehyde (1:3 of the 30 per cent.
A very similar condensation product was obtained by condensing sodium-p-hydroxybenzoate with formaldehyde and subsequent sulphonation with sulphuric acid.
It should be noted that in both these experiments with concentrated formaldehyde solution a slight increase in temperature occurs concurrently with the process of condensation.
Anthraquinone heated with sulphuric acid and treated with formaldehyde in the usual manner, yields a substance which, when mixed with water, forms an opaque, milky solution.
Formaldehyde must, therefore, be termed a pseudo-tannin.
Boric acid, borax, and formaldehyde are the preservatives more often found in milk.
A purple ring will appear at the zone of contact if formaldehyde is present.
Formaldehyde may be detected by placing about 20 c.
You were perfectly willing to go and take a formaldehyde shower-bath, but was it really necessary to be marched about by a squad of gendarmes to eight different departments in order to have that auspicious event officially recorded?
This formaldehyde is a very strong germicide; that is, it is poisonous to bacteria or germs.
Formaldehyde has been used very extensively for this purpose.
For this reason it is used as a preservative of milk, a use which is forbidden by the "Food and Drugs Act," because formaldehyde is also poisonous to the human system.
Formaldehyde is a poison, destructive to all cell life, and has probably been the cause of more actual deaths than any other form of food adulteration.
Formaldehyde is a gas with a strong, irritating odor, and its 40% solution, which is the customary commercial form, also possesses this quality.
In 1911, Stiasny, a well-known leather chemist produced a synthetic substance by the condensation of formaldehyde with a sulphonated phenol, forming an artificial tannin.
The method required that the skins be chrome-tanned in order to render them resistant to the action of hot solutions, the addition of a small amount of formaldehyde to the chrome solution increasing this effect.
Numerous processes have been devised which use formaldehyde in connection with other substances for tanning.
Both theformaldehyde and the naphthol exercise tanning actions, but the process is not used in practise.
The experiments in this case were made by first treating the skins in the weak formaldehyde solution, and then determining the shrinking point in plain water.
The chamois tan, and some of the combinations of the formaldehyde tan with the other methods, give very soft, flexible leathers which possess a sufficiently great resistance to the effects of water and heat.
Some of the combination methods are, pickle with chrome tan, alum tan with chrome tan, and formaldehyde tan with pickle, mineral tan or chamois tan.
Formaldehyde effects a great increase of the resistance of the skins to heat, especially with chamois-tanned furs.
Thus in a German patent is described a method involving the alternate or simultaneous treatment of pelts with solutions of formaldehyde and alpha or beta naphthol.
Formaldehyde Gas+ is an active germicide and very valuable as a disinfectant.
The formaldehyde fumes are employed for the disinfection of clothing, rooms, bedding, and also for the sterilization of catheters.
He fumigated the hold and the forecastle--a precaution that kept all the crew coughing for two days, and drove them out of the odor of formaldehyde to the deck to sleep.
Barring the odor of formaldehyde in the forecastle, which drove me to sleeping on deck for a night or two, everything was going smoothly, at least on the surface.
The formaldehyde with which Turner had fumigated the ship clung here tenaciously, and, mixed with the odors of bilge water and the indescribable heavy smells left by tropical cargoes, made me dizzy and ill.
With dry arsenic and alum, arsenical solution, formaldehyde for an emergency and plenty of salt, even a beginner should be able to save almost anything that falls into his clutches.
This is said to be superior to the formaldehyde solution, though more expensive and harder to carry about on account of its greater bulk before mixing.
Formaldehyde (40% strength) 1 part Water 9 parts Mix thoroughly and put in glass or earthen jars or large mouthed bottles.
Use absorbent, sawdust or meal to remove oily gasoline, drop in alcohol or formaldehyde solution while the body is prepared.
Skins of fish are best kept in either a saturated solution of salt (water with salt added until no more will dissolve), alcohol or formaldehyde solution.
The solution of formaldehyde can be used for this purpose but is not as good as it toughens the flesh, making its future removal more difficult.
By tanning skins with the formaldehyde process, or with Neradol, the artificial tannin, for making into suede leather, the finished article is not only washable but also resists the action of alkalies and soap.
A patent had been taken out several years before for the use of formaldehyde in tanning, but this expired early in 1911; many patents had also been granted for sulphonated phenol preparations, chiefly as disinfectants, but it was left to Dr.
It is at this stage that the formaldehyde is used.
The tannage can then be rapidly completed with fairly strong extracts, as the formaldehyde prevents the contraction of the grain which would ensue if untreated raw pelts were placed in strong tan liquor.
The acid-formaldehyde process is risky, and cannot be recommended.
After being dehaired, puered and drenched, the skins are drummed in a solution of formaldehyde and soda.
Formaldehyde has a hardening and tanning effect on animal tissues, and leather treated by this process often has inferior wearing qualities.
Formaldehyde itself has certain properties which are harmful to leather, and it must be used with extreme caution and in small quantities to avoid these defects.
The occurrence of traces of formaldehyde as a product of alcoholic fermentation by yeast-juice [Lebedeff, 1908] is at least consistent with this theory, but no decisive evidence has so far been obtained either for or against it.
Löb has adduced many striking facts in favour of this view, and has shown that very dilute alkalis produce no lactic acid but formaldehyde and a pentose as primary products.
Borohydrofluoric Acid, Borosalylbenzoic Acid, Boroglycerine, Formaldehyde with Menthol, Thymol, Amyl Acetate and other Antiseptic Aromatics.
Velasquez, Tondo, 12 rats were driven from a burrow underneath a thick cement floor by formaldehyde gas delivered in the burrow through a rubber hose.
Spraying the clothes with a spray of formaldehyde is an effective way of disinfecting them.
Probably the best and simplest fly killer is a weak solution of formaldehyde in water (two teaspoonfuls to the pint).
Don't smellformaldehyde in the pure state; it is very pungent and strong.
The most efficient way to disinfect a room is by means of formaldehyde gas.
Remove it to a solution offormaldehyde and spirit of the following formula:-- Commercial formaldehyde 1 part.
If, on the other hand, it is desired to keep them in a life-like condition they may be kept permanently in a solution of one part of commercial formaldehyde in four parts of water.
Then pour commercial formaldehyde into the tube in considerable quantities.
Heat a few drops of commercialformaldehyde and squirt the liquid while still hot at the Hydra, which will be killed instantaneously.
The condensation of formaldehyde directly into glucose and fructose in the plant cell is brought about by some process the nature of which is not yet understood.
First, cork-like substances have been artificially produced by passing a stream of carbon dioxide through mixtures of formaldehyde with various tannic acids.
Proceeding upon this assumption, many investigators have studied the question as to whether formaldehyde actually is present in green leaves.
This explanation affords a satisfactory solution of the difficulty which formerly confronted the students of photosynthesis, namely, the fact that free formaldehyde is powerfully toxic to cell protoplasm.
New combinations of formaldehyde with other bodies are constantly being brought forward as disinfectants.
Among others the compound resulting from heating lanoline with formaldehyde has been patented (Eng.
How may the presence of formaldehyde in milk be detected?
The presence of formaldehyde is indicated by a violet coloration varying in depth with the amount present.
In the absence of formaldehyde the solution slowly turns brown.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "formaldehyde" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: alcohol; ammonia; chemical; disinfectant; gas; nitrogen; oxygen; poison; preservative; salt; vinegar
