SPIKE A known amount of an element of unusual isotopic composition used in isotope-dilution analysis.
The following parts compose the apparatus: 1) a capillary pipette so graduated as to permit the dilution of 0,05 cc.
The result of that fresh "hustling" was the appointment of the Dilution Commissioners, a second Munitions Act amending the first, and a vast expansion all over the country of the organisation which had seemed so vast before.
When I was in the Midlands and the North, at the end of January and in early February, Dilution was still an unsettled question in some of the most important districts.
On the Dilution plan it is done on a capstan, and takes six minutes.
A similar relation appears in other cases, and, in general, we may say that at great dilution the velocity of an ion is independent of the nature of the other ion present.
The curve for the neutral salt comes to a limiting value; that for the acid attains a maximum at a certain very small concentration, and falls again when the dilution is carried farther.
Another way of eliminating the effects of polarization and of dilution has been used by W.
The decrease in equivalent conductivity at great dilution is, however, so constant that this explanation seems insufficient.
At such great dilution these impurities are present in quantities comparable with the amount of acid which they convert into a less highly conducting neutral salt.
The products of the chemical decomposition of the electrolyte appear at the electrodes and set up the opposing electromotive force of polarization, and unequal dilution of the solution may occur in the neighbourhood of the two electrodes.
If u is greater than v, the combined movement involves a concentration of salt at the cathode, and a corresponding dilution at the anode, and vice versa.
These numbers show clearly that there is an increase in ionic velocity as the dilution proceeds.
Or again, since we know the specific velocity of silver, we can find the velocities of a series of acid radicles at great dilution by measuring the conductivity of their silver salts.
For other strengths of acid, the energy will be less by the quantity of heat evolved by dilution of the acid, because the chemical action must take the H2SO4 from the diluted liquid.
For many years the only form of adulteration recorded by public analysts related to the alcoholic strength, the undue dilution of spirits with water being, of course, a profitable form of fraud.
The twelfthdilution would of course fill a million such lakes.
The process of dilution is carried on in the same way as the attenuation of the powder was done; each successive dilution with alcohol reducing the medicine to a hundredth part of the quantity of that which preceded it.
But for persons of very delicate nerves it is proper that the dilution should be carried to the decillionth degree.
By the time the seventeenth degree of dilution should be reached, the alcohol required would equal in quantity the waters of ten thousand Adriatic seas.
There are those whose minds are satisfied with the decillionth dilution of a scientific proof.
The water for dilution and the dilute sulphuric acid used for washing should be previously tested, to see they have no reducing action, with dilute permanganate of potassium solution.
The acid is used without dilution when no directions are expressly given to dilute it.
The return of the blue colour after titration is due to the excessive dilution of the assay, or to an insufficiency of potassium iodide, or to the presence of nitrous fumes.
When solution has been effected, dilution with a measured volume is generally necessary.
According to Koch, his remedy, consisting of a brownish liquid, is easily perishable as soon as it is diluted with water; he recommends the preparation of the dilution of the remedy with a 5 per cent.
The dilution of the remedy for use must be considerable, as only small quantities of the same are used.
If more salt be added to the solution, the light will disappear, but instantly burst forth from absolute darkness by dilution with water.
Make a strong dilution of camphor in spirit of wine, which add to soft water, in the proportion of a dram to a pint.
The dilution of iodin with an equal amount of alcohol has been practised by the author in many cases, but later this was found unnecessary.
If daily injections are necessary, dilution of the tincture of iodin with an equal amount of alcohol is advisable in order to avoid doing irreparable damage to the articular cartilages and synovial membranes.
Where much synovia is contained within the sheath at the time of injection, there occurs great dilution of the agent injected and consequently less irritation results.
Alkalinity, which is usually sodium carbonate, and may be somewhat considerable if the soap has been grained with caustic alkali, is determined after dilution with water by titrating with N/2 acid, using methyl orange as indicator.
A closed steam coil will, on the whole, give the best results, as then no weakening of the dye-liquor can take place through dilution by the condensation of the steam.
When zinc chloride is dissolved in hydrochloric acid a liquid is obtained which dissolves cellulose; on dilution the cellulose is re-precipitated in a hydrated form.
Now the effective change produced by the action of the current is the concentration of the more dilute solution by the dissolution of metal in it, and the dilution of the originally stronger solution by the separation of metal from it.
If either ion carried with it some of the unaltered salt or some of the solvent, concentration or dilution of the liquid would be produced where the ion was liberated.
The value of k, however, does not keep constant so satisfactorily in the case of highly dissociated substances, and empirical formulae have been constructed to represent the effect of dilution on them.
The measurements of freezing points of solutions at the extreme dilution necessary to secure complete ionization is a matter of great difficulty, and has been overcome only in a research initiated by E.
It should be noted, however, that another cause would be competent to explain the unequal dilution of the two solutions.
The salts tabulated are those of which the equivalent conductivity reaches a limiting value indicating that complete ionization is reached as dilution is increased.
It is probable that in both these solutions complex ions exist at fairly high concentrations, but gradually gets less in number and finally disappear as the dilution is increased.
The freezing point curve usually lies below the electrical one, but approaches it as dilution is increased.
Hittorf and many other observers have made experiments to determine the unequal dilution of a solution round the two electrodes when a current passes.
Dilution of labour had become in their eyes a device for destroying all their hardly won privileges and restrictions, and for delivering them bound and helpless to their "capitalist oppressers.
The danger arose over that still insistent problem--the "dilution of labour.
It was ugly when dilutionof labour first came in, but the wages are so high that all that trouble has settled down.
Civilians came north to examine the position on behalf of the Ministry of Munitions; they came, wrung their hands, and reported in terror that if dilution were pressed, a hundred thousand men would be "out.
Yet the risk had to be taken, for dilution must be pressed.
They had come for a last meeting with the officers of the Munitions Dept, and to declare that the men whom they represented were resolved not to permit of any further dilution of labour.
On the contrary, as soon as its original capacity is reduced to a minimum by dilution, further dilution gives it the power to cause actually stronger reactions, of a different and usually opposite kind.
The degree of dilution thus arrived at is 1:10, usually symbolized as Ix.
A simple calculation shows - if we accept the ordinary scientific view as to the size of a molecule - that not a single molecule of the original substance will remain in the solution after a certain degree of dilution has been reached.
This second capacity rises through stages to a variable maximum asdilution proceeds.
Further dilutions in multiples of ten can be prepared in the same way, and by varying the number of volumes of diluting fluid or serum any required dilution can be made (see Appendix, Dilution Tables).
When pathogenic or excremental bacteria are present in water, their numbers are relatively few, owing to the dilution they have undergone, and it is usual in commencing the examination, to adopt one or other of the following methods: A.
Remove a drop of the broth from the second dilution tube with a large platinum loop; raise the bell glass and deposit the drop on the centre of the cover-slip.
Label the plates with the distinctive name or number of the inoculum, also the date; the number of the dilution having been previously indicated (step 3).
Label each tube with the dilution of serum that it contains--viz.
When the yield of serum from the specimen of blood which has been collected, or is available, is small, the above method of diluting is not practicable, and the dilution should be carried out by Wright's method in a capillary teat pipette.
Hæmoglobin estimation is difficult owing to turbidity of the blood after dilution with water.
Observing precisely similar technique, a few drops of liquefied gelatine or agar from the second dilution tube may be run over the surface of the sterile cover-slip and a hanging-drop plate cultivation thereby prepared.
Dilution of the Specific Serum~: Apparatus required: Sterile graduated capillary pipettes to contain 10 c.
Use for dilution a seven per cent milk, that is, milk containing seven per cent fat, as in this milk the fat is just twice the proteids.
We know from actual experimental work in the laboratory that the higher dilution will not kill.
If a portion of the brain of an animal dead from street virus is taken and made up in a dilution of one to five hundred, and this is injected, we find that it does not produce death.
The saliva may be filtered and held back so that a small amount is introduced; perhaps a dilution of one to five hundred of the virus may get into the wound, but this is usually not enough to cause the disease.
In the early days of bacteriology supposedly pure cultures were obtained by (1) dilution in liquid media.
If one or two of these latter showed a growth and the others not, it was assumed that the dilution had been carried so far that only a single organism was transferred and therefore the culture obtained was "pure.
It was evident, however, that I was in possession of all, and more than all, I wanted, and that the dilution of so powerful an accelerator would probably give successful results.
Phosphorus is to be taken internally, and the first dilution put in water, twenty drops to one gill, and applied to the surface by means of cloths wet in the mixture, as hot as it can be borne, and laid over the whole breast.
Eryrgium Aquaticum 1, night and morning for a week, and then give them at the 3d dilution until the symptoms subside.
Triturate the powders thoroughly for an hour or more upon each, and shake the dilution from fifty to one hundred times, more for the higher attenuations.
It is of little moment whether this redundant gas comes from the water of dilution or from the fermentable matter, as under, if we can by any means turn it to account.
The amount of milk should be increased and the amount of dilution decreased until the undiluted breast milk is given in four or five days.
Upon dilution with water, the amount of fat in the mixture is just a trace.
There are cases in which simple dilution is not advisable.
If thedilution is too great, the infant, while receiving the correct amount of the mixture, may have the necessary food constituents so reduced as to have them fail completely to do their appointed work in the body.
The dilution may be too great or too small to meet the needs of the infant.
