There were three main kinds of harpoon that the Aleut ’ s used: a simple harpoon, with a head that kept its original position in the animal after striking, a compound ( toggle-head ) harpoon in which the head took a horizontal position in the animal after penetration, and the throwing-lance used to kill large animals.

For example, the creation of argon fluorohydride ( HArF ), a marginally stable compound of argon with fluorine and hydrogen, was reported by researchers at the University of Helsinki in 2000.

In 1806, the French chemists Louis-Nicolas Vauquelin and Pierre Jean Robiquet isolated a compound in asparagus that was subsequently named asparagine, the first amino acid to be discovered.

Known to the Iranians by the Pahlavi compound word kah-ruba ( from kah “ straw ” plus rubay “ attract, snatch ,” referring to its electrical properties ), which entered Arabic as kahraba ' or kahraba, it too was called amber in Europe ( Old French and Middle English ambre ).

After this initial chemotherapeutic compound proved effective, others pursued similar lines of inquiry, but it was not until in 1928 that Alexander Fleming observed antibiosis against bacteria by a fungus of the genus Penicillium.

Fleming postulated the effect was mediated by an antibacterial compound named penicillin, and that its antibacterial properties could be exploited for chemotherapy.

He was also the first to establish that sulfur was an element ( 1777 ) rather than a compound.

The 2, 4, 5-T used to produce Agent Orange was later discovered to be contaminated with 2, 3, 7, 8-tetrachlorodibenzodioxin ( TCDD ), an extremely toxic dioxin compound.

According to Ferdinand Bohlmann, the first naturally occurring acetylenic compound, dehydromatricaria ester, was isolated from an Artemisia species in 1826.

The Throwing lance usually consisted of three parts: a wooden shaft, a bone ring or belt, and the compound head that was made with a barbed bonehead and a stone tip.

The length of the compound head was equivalent to the distance between the planes of a man ’ s chest to his back.

The organobromine nature of the compound was not discovered until 1909 ( see Paul Friedländer ).

The word may be a compound containing the Old English adjective brytten ( from the verb breotan meaning ' to break ' or ' to disperse '), an element also found in the terms bryten rice (' kingdom '), bryten-grund (' the wide expanse of the earth ') and bryten cyning (' king whose authority was widely extended ').

The most common compound of chlorine, sodium chloride, has been known since ancient times ; however, around 1630, chlorine gas was obtained by the Belgian chemist and physician Jan Baptist van Helmont.

The metal was named after the Latin word for calamine, since the metal was found in this zinc compound.

Formerly the name " carbohydrate " was used in chemistry for any compound with the formula C < sub > m </ sub > ( H < sub > 2 </ sub > O ) < sub > n </ sub >.

The first modern chemotherapeutic agent was arsphenamine, an arsenic compound discovered in 1909 and used to treat syphilis.

The rapid adoption of the compound crank can be traced in the works of the Anonymous of the Hussite Wars, an unknown German engineer writing on the state of the military technology of his day: first, the connecting-rod, applied to cranks, reappeared, second, double compound cranks also began to be equipped with connecting-rods and third, the flywheel was employed for these cranks to get them over the ' dead-spot '.

The ratio between A and B in the vapor will be different from the ratio in the liquid: the ratio in the liquid will be determined by how the original mixture was prepared, while the ratio in the vapor will be enriched in the more volatile compound, A ( due to Raoult's Law, see above ).

In The Song the man who served him as his closest adviser was his vassal and kinsman Álvar Fáñez " Minaya " ( meaning " My brother ", a compound word of Spanish possessive Mi ( My ) and Anaia, the basque word for brother ), although the historical Álvar Fáñez remained in Castile with Alfonso VI.

Thus the foundation was laid of the doctrine of compound radicals, a doctrine which had a profound influence on the development of chemistry.

Soddy wrote that financial debts grew exponentially at compound interest but the real economy was based on exhaustible stocks of fossil fuels.

The most important factor in determining what properties the end-product will have is quite naturally the type of hydroxyl-rich compound that is used in its production.

Comparisons, which are most commonly planned, can be either simple or compound.

Arsenic is a common n-type dopant in semiconductor electronic devices, and the optoelectronic compound gallium arsenide is the most common semiconductor in use after doped silicon.

They generally possess compound eyes and a carapace, which may be a shell of two valves enclosing the trunk ( as in most Cladocera ), broad and shallow ( as in the Notostraca ), or entirely absent ( as in the Anostraca ).

Cellulose is the most common organic compound and biopolymer on Earth.

Two thirds of the chemical elements occur on Earth only as compounds, and in the remaining third, often the compound forms of the element are most common.

Hafnium carbide is the most refractory binary compound known, with a melting point over 3890 ° C, and hafnium nitride is the most refractory of all known metal nitrides, with a melting point of 3310 ° C.

Cellulose, the wood-derived material most paper is made of, is naturally charged, and so a compound that complexes with both the dye and the paper's surface aids retention at the surface.

The most abundant compound in spearmint oil is R -(–)- carvone, which gives spearmint its distinctive smell.

Its most common compound, titanium dioxide, is a popular photocatalyst and is used in the manufacture of white pigments.

It typifies the most common Chinese character classification of " radical-phonetic " or " phono-semantic " graphs, which compound a " radical " or " signific " ( roughly providing semantic information ) with a " phonetic " ( suggesting ancient pronunciation ).

The most important industrial vanadium compound, vanadium pentoxide, is used as a catalyst for the production of sulfuric acid.

As chirality and rigidity are the two most important features distinguishing approved drugs and natural products from compounds in combinatorial chemistry libraries, these are the two issues emphasized in so-called diversity oriented libraries, i. e. compound collections that aim at coverage of the chemical space, instead of just huge numbers of compounds.

One of the most active areas of solid propellant research is the development of high-energy, minimum-signature propellant using CL-20 ( China Lake compound # 20 ), C < sub > 6 </ sub > H < sub > 6 </ sub > N < sub > 6 </ sub >( NO < sub > 2 </ sub >)< sub > 6 </ sub >, which has 14 % higher energy per mass and 20 % higher energy density than HMX.

Usually the semiconductor of choice is silicon, but some chip manufacturers, most notably IBM and Intel, recently started using a chemical compound of silicon and germanium ( SiGe ) in MOSFET channels.

Piece is a, " general, non-technical term began to be applied mainly to instrumental compositions from the 17th century onwards .... other than when they are taken individually ' piece ' and its equivalents are rarely used of movements in sonatas or symphonies .... composers have used all these terms their different languages frequently in compound forms Klavierstück .... In vocal music ... the term is most frequently used for operatic ensembles ..."

Guaiacol is the phenolic compound most responsible for the " smokey " taste, while syringol is the primary contributor to smokey aroma.

The prostate ( from Greek προστάτης-prostates, literally " one who stands before ", " protector ", " guardian ") is a compound tubuloalveolar exocrine gland of the male reproductive system in most mammals.

Their most noted active constituent is theobromine, a compound similar to caffeine.

The most prominent features are the compound eyes, the second antennae, and a pair of abdominal setae.

The most commonly applied model of the time value of money is compound interest.

The most common kind of definite compound inflorescence is the panicle ( of Webeling, or ' panicle-like cyme ').