He is credited with the discovery of the element arsenic and experimented with photosensitive chemicals, including silver nitrate.

Following the discovery of gold and silver in 1859 on the nearby Comstock Lode, Carson City's population began to rise.

In 1801, the German physicist Johann Wilhelm Ritter made the discovery of ultraviolet by noting that the rays from a prism darkened silver chloride preparations more quickly than violet light.

The discovery of silver at the Comstock Lode in 1859 led to a population boom that was an impetus to the creation of Nevada Territory out of western Utah Territory in 1861.

Working in conjunction with Louis Daguerre, they experimented with silver compounds based on a Johann Heinrich Schultz discovery in 1816 that a silver and chalk mixture darkens when exposed to light.

He discovered sodium thiosulphate solution to be a solvent of silver halides in 1819, and informed Talbot and Daguerre of his discovery in 1839 that it could be used to " fix " pictures and make them permanent.

The first permanent photograph was made in 1822 by a French inventor, Joseph Nicéphore Niépce, building on a discovery by Johann Heinrich Schultz ( 1724 ): that a silver and chalk mixture darkens under exposure to light.

In 1801, the German physicist Johann Wilhelm Ritter made the discovery of ultraviolet by noting that the rays from a prism darkened silver chloride preparations more quickly than violet light.

During the 19th century, the bimetallism that prevailed in most countries was undermined by the discovery of large deposits of silver in the Americas ; fearing a sharp decrease in the value of silver and thus the currency, most states switched to a gold standard by 1900.

A Tyrian shekel of Rome, a possibility for the type of silver coin used to bribe Judas Iscariot. The stability of the Roman currency relied to a high degree on the supply of silver bullion, which Roman miners produced on a scale unparalleled before the discovery of the New World.

The discovery of massive silver deposits in the New World during the succeeding centuries has been stated as a cause for its price to have diminished greatly.

In the oxidation state + 1 most compounds closely resemble the corresponding potassium or silver compounds ( the ionic radius of thallium ( I ) is 1. 47 Å while that of potassium is 1. 33 Å and that of silver is 1. 26 Å ), which was the reason why thallium was sometimes considered to be an alkali metal in Europe ( but not in England ) in the years immediately following its discovery.

The discovery of UV radiation was associated with the observation that silver salts darkened when exposed to sunlight.

* The discovery of silver at Zacatecas and Guanajuato in Mexico, and Potosí in Bolivia, stimulates silver rushes ( approximate date ).

Following the Spanish discovery of great silver deposits at Potosí in Bolivia and in Mexico during the 16th century, international trade came to depend on coins such as the Spanish dollar, Maria Theresa thaler, and, in the 1870s, the United States Trade dollar.

He discovered sodium thiosulfate to be a solvent of silver halides in 1819, and informed Talbot and Daguerre of his discovery that this " hyposulphite of soda " (" hypo ") could be used as a photographic fixer, to " fix " pictures and make them permanent, after experimentally applying it thus in early 1839.

Countering this trend, with the discovery and mining of silver deposits in Europe, Italy began the first tentative steps toward a large silver coinage with the introduction in 1472 of the lira tron in excess of six grams, a substantial increase over the, roughly, four-gram gros tournois of France.

The exceptional 16th-century Brussels tapestry known as " To the birthwort ", both Gothic and Renaissance, is inspired by the discovery of the Americas, and their fauna and flora: it contains Peruvian silver pheasants, pineapples, orchids, pomegranates, animals and vegetables which until then were unknown in Europe.

The development of the area was spurred by the discovery of large silver deposits near Rico in 1879, and the Rio Grande Southern Railroad was constructed through the County to connect Durango, Telluride, and Ridgway in 1890-92 The RGS served the eastern end of Dolores County until 1952 when it was abandoned.

Just as I was about to enlarge upon my discovery of the underside of the leaf of love, memory, displeased at being asked to yield its unsavory secrets, dashed ahead of me, calling back over its shoulder: `` Skip it.

The sequence of events leading to his important discovery still remains ambiguous but it seems that one of the advanced students at the university related that the first direct event that led to the publication of Oersted's discovery occurred during a private lecture made before a group of other advanced students in the spring of 1820.

The discovery of 26 individuals at one site provides evidence of pack behaviour and allows studies of ontogeny and population biology which are impossible with lesser-known dinosaurs.

The discovery was made public at a recent meeting of the Brazilian Geophysical Society in Rio de Janeiro.

Fleming was the first to push these studies further by isolating the penicillin, and by being motivated enough to promote his discovery at a larger scale.

" It is highly probable that the correct information about the sulphonamide did not reach the newspapers because, since the original sulphonamide antibacterial, Prontosil, had been a discovery by the German laboratory Bayer, and as Britain was at war with Germany at the time, it was thought better to raise British morale by associating Churchill's cure with the British discovery, penicillin.

* When 2000 was approaching, at least three large Swedish magazines ranked penicillin as the most important discovery of the millennium.

A rare discovery of metal plates belonging to wooden doors was made at Balawat ( Imgur-Enlil ).

When this discovery was followed up in 1870, on the neighbouring Santorin ( Thera ), by representatives of the French School at Athens, much pottery of a class now known immediately to precede the typical late Aegean ware, and many stone and metal objects, were found.

But by laying bare in 1884 the upper stratum of remains on the rock of Tiryns, Schliemann made a contribution to our knowledge of prehistoric domestic life which was amplified two years later by Christos Tsountas's discovery of the palace at Mycenae.

At the time, there were media reports about the discovery of two bombs, one at Manila airport and another at the venue for the leaders ' meeting ".

Gerty Cori and Carl Cori jointly won the Nobel Prize in Physiology or Medicine | Nobel Prize in 1947 for their discovery of the Cori cycle at RPMI.

The first Bigfoot hunters began following the discovery of footprints at Bluff Creek, California.

While the scientific community was once divided between supporters of the Big Bang and those of alternative cosmological models, most scientists became convinced that some version of the Big Bang scenario best fit observations after the discovery of the cosmic microwave background radiation in 1964, and especially when its spectrum ( i. e., the amount of radiation measured at each wavelength ) was found to match that of thermal radiation from a black body.

In 1999, the team at LBNL claimed the discovery of long-lived < sup > 267 </ sup > Bh ( 5 atoms ) and < sup > 266 </ sup > Bh ( 1 atom ).< ref > Later, both of these were confirmed.

With the discovery of the Dead Sea scroll, 4QDan < sup > c </ sup > at Qumran, dating 125 BCE, it does not reassure critics that Daniel was written in the 2nd century BCE.

Cape Breton Island's first residents were likely Maritime Archaic natives, ancestors of the Mi ' kmaq, the latter of whom inhabited the island at the time of European discovery.

The popularly reported European discovery of the okapi in 1901, earlier hinted at but unseen by Henry Morton Stanley in his travelogue of exploring the Congo, later became the emblem for the now defunct International Society of Cryptozoology.

According to Mike Dash, a Welsh historian, few scientists doubt there are thousands of unknown animals, particularly invertebrates, awaiting discovery ; however, cryptozoologists are largely uninterested in researching and cataloging newly-discovered species of ants or beetles, instead focusing their efforts towards " more elusive " creatures that have often defied decades of work aimed at confirming their existence.

By those ignorant of the details of his discovery of the Codex Sinaiticus, Tischendorf was accused of buying manuscripts from ignorant monastery librarians at low prices.

With the discovery of the mines of Chihuahua in 1631 there was more Spanish presence in the Tarahuama lands, and the Jesuits sent more missionaries.

This has led some authors to advocate that Giesel alone should be credited with the discovery.

J. J. Thomson created a technique for separating atom types through his work on ionized gases, which subsequently led to the discovery of stable isotopes.

More recent observations made in the laboratory of antibiosis between micro-organisms led to the discovery of natural antibacterials produced by microorganisms.

The discovery of such a powerful antibiotic was unprecedented, and the development of penicillin led to renewed interest in the search for antibiotic compounds with similar efficacy and safety.

Florey credited Dubos with pioneering the approach of deliberately and systematically searching for antibacterial compounds, which had led to the discovery of gramicidin and had revived Florey's research in penicillin.

The 1940 discovery of a lost work by Vincent of Lérins, which bears a striking similarity to much of the language of the Athanasian Creed, have led many to conclude that the creed originated either with Vincent or with his students.

Aberration should not be confused with stellar parallax, although it was an initially fruitless search for parallax that first led to its discovery.

The discovery of chlorpromazine's psychoactive effects in 1952 led to greatly reduced use of restraint, seclusion, and sedation in the management of agitated patients, and also led to further research that resulted in the development of antidepressants, anxiolytics, and the majority of other drugs now used in the management of psychiatric conditions.

The publication of Total Baseball led to the discovery of several " phantom ballplayers ", such as Lou Proctor, who did not belong in official record books and were removed.

The greed for gold led to the discovery of the process for its purification, even though the underlying principles were not well understood — it was thought to be a transformation rather than purification.

It was fire that led to the discovery of iron and glass.

Early twentieth-century experiments on the physics of very small-scale phenomena led to the discovery of phenomena which could not be predicted on the basis of classical physics, and to the development of new models ( theories ) that described and predicted very accurately these micro-scale phenomena.

This was a major discovery in an important field of mathematics ; construction problems had occupied mathematicians since the days of the Ancient Greeks, and the discovery ultimately led Gauss to choose mathematics instead of philology as a career.

The discovery of Ceres led Gauss to his work on a theory of the motion of planetoids disturbed by large planets, eventually published in 1809 as Theoria motus corporum coelestium in sectionibus conicis solem ambientum ( Theory of motion of the celestial bodies moving in conic sections around the Sun ).

She called this experience " the falling apple " that led to her discovery of Christian Science.

She referred to this event as her " Great Discovery ", the " falling apple " that led to her " discovery how to be well " herself ( ibid.

This led to a weakening of the domestic economy after Columbus ' discovery of America, as the economy became dependent on colonial activities ( plundering, mining, cattle, plantations, trade, etc.

It was here that during 1935, the Regent, Reting Rinpoche, received a clear vision of three Tibetan letters and of a monastery with a jade-green and gold roof, and a house with turquoise roof tiles, which led to the discovery of Tenzin Gyatso, the 14th Dalai Lama.

The success of his discovery soon spread around Europe and for example was used en masse in the Spanish Balmis Expedition, a three year long mission to the Americas, Philippines, Macao, China, and Saint Helena Island led by Dr. Francisco Javier de Balmis with the aim of giving thousands the smallpox vaccine.

This discovery led to the well-known axiom: like-charged objects repel and opposite-charged objects attract.

This discovery led to less emphasis on learning the classics because they found that studying the classics does not contribute to overall general intelligence.