In the present work whole sera have been fractionated by chromatography on DEAE-cellulose using single gradients similar to those described by Sober and Peterson, and certain chemical and serological properties of the fractions containing antibodies of the ABO and Rh systems have been described.

It is therefore necessary to consider the properties of pituitary TSH if the fragmentary chemical information about blood TSH is to be discussed rationally.

Crystallographic, physical, optical, and chemical properties.

The aim is to collect a very broad range of physical, chemical, morphological, and structural data for crystals on an encyclopedic scale and to seek all possible useful and revealing correlations of properties with internal structure.

The alkali metals are a group of chemical elements in the periodic table with very similar properties: they are all shiny, soft, silvery, highly reactive metals at standard temperature and pressure and readily lose their outermost electron to form cations with charge + 1.

Experiments have been conducted to attempt the synthesis of ununennium ( Uue ), which is likely to be the next member of the group, but they have all met with failure .< ref name =" link "> However, ununennium may not be an alkali metal due to relativistic effects, which are predicted to have a large influence on the chemical properties of superheavy elements.

Dmitri Mendeleev claimed he arranged his tables in order of atomic weight (" Atomgewicht ") However, in deference to the observed chemical properties, he violated his own rule and placed tellurium ( atomic weight 127. 6 ) ahead of iodine ( atomic weight 126. 9 ).

Besides iodine and tellurium, later several other pairs of elements ( such as argon and potassium, cobalt and nickel ) were known to have nearly identical or reversed atomic weights, leaving their placement in the periodic table by chemical properties to be in violation of known physical properties.

Each element has a specific set of chemical properties as a consequence of the number of electrons present in the neutral atom, which is Z ( the atomic number ).

Hence it is the atomic number alone that determines the chemical properties of an element ; and it is for this reason that an element can be defined as consisting of any mixture of atoms with a given atomic number.

The close similarity of physical and chemical properties of actinium and lanthanum makes separation of actinium from the ore impractical.

Actinium has similar chemical properties as lanthanum and other lanthanides, and therefore these elements are difficult to separate when extracting from uranium ores.

Many chemical properties of astatine have been determined using tracer studies on extremely dilute astatine solutions.

The electrons determine the chemical properties of an element, and strongly influence an atom's magnetic properties.

The table itself is a visual representation of the periodic law, which states that certain chemical properties of elements repeat periodically when arranged by atomic number.

As the chemical properties of the elements were known to largely repeat themselves according to the periodic law, in 1919 the American chemist Irving Langmuir suggested that this could be explained if the electrons in an atom were connected or clustered in some manner.

* Of or relating to the Atom, the smallest particle of a chemical element that retains its chemical properties

The chemical structures of the 22 standard amino acids, along with their chemical properties, are described more fully in the article on these proteinogenic amino acids.

Its chemical and physical properties are so similar to that of natural amethyst that it can not be differentiated with absolute certainty without advanced gemnological testing ( which is often cost-prohibitive ).

Allotropes are different structural forms of the same element and can exhibit quite different physical properties and chemical behaviours.

These two isomers of butene are slightly different in their chemical and physical properties.

The atomic number uniquely identifies a chemical element.

Argon ( ) is a chemical element with symbol Ar and atomic number 18.

The name " argon " is derived from the Greek word αργον meaning " lazy " or " the inactive one ", a reference to the fact that the element undergoes almost no chemical reactions.

Arsenic ( ) is a chemical element with symbol As and atomic number 33.

Antimony ( or ; ) is a toxic chemical element with symbol Sb and atomic number 51.

Actinium ( ) is a radioactive chemical element with symbol Ac and atomic number 89, which was discovered in 1899.

Americium ( ) is a transuranic radioactive chemical element that has the symbol Am and atomic number 95.

Astatine ( or ) is a radioactive chemical element with the chemical symbol At and atomic number 85.

An atom is classified according to the number of protons and neutrons in its nucleus: the number of protons determines the chemical element, and the number of neutrons determines the isotope of the element.

He proposed that each element consists of atoms of a single, unique type, and that these atoms can join together to form chemical compounds.

* Americium, a chemical element

of atoms, in the modern sense of the basic unit of a chemical element.

* 1982 – The synthetic chemical element Meitnerium, atomic number 109, is first synthesized at the Gesellschaft für Schwerionenforschung in Darmstadt, Germany.

This text clarified the concept of an element as a substance that could not be broken down by any known method of chemical analysis, and presented Lavoisier's theory of the formation of chemical compounds from elements.

* Gold, a chemical element with the symbol Au

The money was devoted largely to developing “ technical advice on the conduct of defoliation and anti-crop activities in Southeast Asia .” By the end of fiscal year 1962, the Chemical Corps had let or were negotiating contracts for over one thousand chemical defoliants.

The Swiss chemical industry operates largely from Basel, and Basel also has a large pharmaceutical industry.

Kekulé's idea of assigning certain atoms to certain positions within the molecule, and schematically connecting them using what he called their " Verwandtschaftseinheiten " (" affinity units ", now called " valences " or " bonds "), was based largely on evidence from chemical reactions, rather than on instrumental methods that could peer directly into the molecule, such as X-ray crystallography.

The study of molecules by molecular physics and theoretical chemistry is largely based on quantum mechanics and is essential for the understanding of the chemical bond.

Organic compounds were traditionally characterized by a variety of chemical tests, called " wet methods ", but such tests have been largely displaced by spectroscopic or other computer-intensive methods of analysis.

Uraninite is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO < sub > 2 </ sub >, but also contains UO < sub > 3 </ sub > and oxides of lead, thorium, and rare earth elements.

Their commercial utility was based largely on their chemical stability, including low flammability, and desirable physical properties, including electrical insulating properties.

The city's economy is largely reliant on heavy industry, including one of Russia's largest aluminum plants, lumber mills, chemical works, and a coal-fired power station.

In the past, castile soap was a common additive in an enema, but it has largely fallen out of use because of its irritating action in the rectum and because of the risk of chemical colitis as well as the ready availability of other enema preparations that are perhaps more effective than soap in stimulating a bowel movement.

The exact chemical mechanism by which this happens is still largely unknown.

These chemical reactions require energy, which mainly comes from the sun and largely by photosynthesis, although a very small amount comes from hydrothermal vents and hot springs.

In this way, given certain conditions ( which are largely temperature-dependent ) kerogens will break down to form hydrocarbons through a chemical process known as cracking, or catagenesis.

He was awarded his Bachelor of Science degree in June 1919, but since at the time Jews were largely excluded from jobs in the chemical industry and academia, he did not receive any job offers.

The club was founded on 13 November 1930 and was made up largely of employees from the local chemical factory Wacker Chemie, which was established in 1914, and still sponsors the club today.

Tetryl was once a very popular chemical for booster charges, particularly during World War II, but has been largely superseded by other compositions e. g. a small cylinder or pellet of phlegmatized RDX or PETN ( slightly larger than the actual detonator ) into which the detonator itself is inserted.

* Mineralogist Alexandre-Emile Béguyer de Chancourtois makes the first proposal to arrange the chemical elements in order of atomic weights, although this is largely ignored by chemists.

When using a standard process-where the interaction of the many chemical, thermal, and photographic variables are known and carefully controlled-the behaviour of the final integrated circuit depends largely on the positions and interconnections of the geometric shapes.

Over 40, 000 of Wilson's photographic glass plates still exist today, largely due to the meticulous washing and chemical treatments he insisted on.

Recent extinction trends can be attributed largely to sedimentation, stream fragmentation, chemical and organic pollutants, dams, and invasive species.

Rock analysis has of late years ( largely under the influence of the chemical laboratory of the United States Geological Survey ) reached a high pitch of refinement and complexity.

Fortunately the college was more or less successful, owing largely to his enthusiasm and energy, and many of the men who were trained there subsequently made their mark in chemical history.

There was little near the site of the Alewife station besides a largely abandoned industrial park, a chemical factory and a protected wetlands.

It was largely abandoned as modern chemical methods became available ; however, as lice populations can and do develop resistance, manual nitpicking is still often necessary.