DHS (disambiguation)

DHS usually refers to the U.S. Department of Homeland Security.

DHS may also refer to:

Government agencies and programs:

In science and technology:

Places:

Other uses:

3-Dehydroshikimic acid

3-Dehydroshikimic acid is a chemical compound related to shikimic acid. 3-DHS is available in large quantity through engineering of the shikimic acid pathway.

Metabolism

Biosynthesis: The enzyme 3-dehydroquinate dehydratase uses 3-dehydroquinate to produce 3-dehydroshikimate and H₂O.

3-Dehydroshikimate is then reduced to shikimic acid by the enzyme shikimate dehydrogenase, which uses nicotinamide adenine dinucleotide phosphate (NADPH) as a cofactor.

Gallic acid is also formed from 3-dehydroshikimate by the action of the enzyme shikimate dehydrogenase to produce 3,5-didehydroshikimate. This latter compound spontaneously rearranges to gallic acid.

References

United States Department of Homeland Security

The United States Department of Homeland Security (DHS) is a cabinet department of the United States federal government, created in response to the September 11 attacks, and with the primary responsibilities of protecting the territory of the United States and protectorates from and responding to terrorist attacks, man-made accidents, and natural disasters. In fiscal year 2011 it was allocated a budget of $98.8 billion and spent, net, $66.4 billion.

Whereas the Department of Defense is charged with military actions abroad, the Department of Homeland Security works in the civilian sphere to protect the United States within, at, and outside its borders. Its stated goal is to prepare for, prevent, and respond to domestic emergencies, particularly terrorism. On March 1, 2003, DHS absorbed the Immigration and Naturalization Service and assumed its duties. In doing so, it divided the enforcement and services functions into two separate and new agencies: Immigration and Customs Enforcement and Citizenship and Immigration Services. The investigative divisions and intelligence gathering units of the Immigration and Naturalization Service (INS) and Customs Service were merged forming Homeland Security Investigations. Additionally, the border enforcement functions of the INS, including the U.S. Border Patrol, the U.S. Customs Service, and the Animal and Plant Health Inspection Service were consolidated into a new agency under DHS: U.S. Customs and Border Protection. The Federal Protective Service falls under the National Protection and Programs Directorate.

Snowflake

A snowflake is either a single ice crystal or an aggregation of ice crystals which falls through the Earth's atmosphere. They begin as snow crystals which develop when microscopic supercooled cloud droplets freeze. Snowflakes come in a variety of sizes and shapes. Complex shapes emerge as the flake moves through differing temperature and humidity regions, such that individual snowflakes are almost always unique in structure. Snowflakes encapsulated in rime form balls known as graupel. Snowflakes appear white in color despite being made of clear ice. This is due to diffuse reflection of the whole spectrum of light by the small crystal facets.

Formation

In warmer clouds an aerosol particle or "ice nucleus" must be present in (or in contact with) the droplet to act as a nucleus. The particles that make ice nuclei are very rare compared to nuclei upon which liquid cloud droplets form; however, it is not understood what makes them efficient. Clays, desert dust and biological particles may be effective, although to what extent is unclear. Artificial nuclei include particles of silver iodide and dry ice, and these are used to stimulate precipitation in cloud seeding.

Snowflakes (disambiguation)

Snowflakes may refer to

See also

Snowflakes (album)

Snowflakes is the fourth studio album and first Christmas album by American singer Toni Braxton, released on October 23, 2001 by Arista Records. Along with the traditional Christmas songs "The Christmas Song" and "Have Yourself a Merry Little Christmas" and a cover of Vince Guaraldi's 1962 song "Christmas Time Is Here", the album contains original songs which focus not only on Christmas, but also on love. Braxton was newly married and expecting her first child while making the album. In the United States, the album had sold 538,000 copies as of February 2012.

Track listing

Charts

References