DNA viruses belong to either Group I or Group II of the Baltimore classification system for viruses.

Although Group VII viruses such as hepatitis B contain a DNA genome, they are not considered DNA viruses according to the Baltimore classification, but rather reverse transcribing viruses because they replicate through an RNA intermediate.

The ICTV classifies RNA viruses as those that belong to Group III, Group IV or Group V of the Baltimore classification system of classifying viruses, and does not consider viruses with DNA intermediates in their life cycle as RNA viruses.

Viruses with RNA as their genetic material but which include DNA intermediates in their replication cycle are called retroviruses, and comprise Group VI of the Baltimore classification.

Animal RNA viruses are classified into three distinct groups depending on their genome and mode of replication ( and the numerical groups based on the older Baltimore classification ):

Currently there are two main schemes used for the classification of viruses: the ICTV system and Baltimore classification system, which places viruses into one of seven groups.

* The dsRNA virusses ( e. g. Rotavirus ) according to the Baltimore classification.

* Baltimore classification

* Baltimore classification, system used to classify viruses, named for biologist David Baltimore

They are classified as group I under the Baltimore classification scheme, meaning their genomes consist of double stranded DNA.

Mimivirus has been placed into a viral family by the International Committee on Taxonomy of Viruses as a member of the Mimiviridae, and has been placed into Group I of the Baltimore classification system.

In 2004, a group of international uveitis specialists convened in Baltimore, MD, to standardize the method of reporting data in uveitis clinical trials, including anatomical classification.

The Aberdeen IronBirds are a Short-Season A classification affiliate of the Baltimore Orioles.

According to the Baltimore classification they are considered class II viruses.

The Birnaviridae are type-III viruses in the Baltimore classification, which means they have a double-stranded RNA genome.

The viruses are positive-sense ssRNA viruses, placing them in Group IV of the Baltimore classification.

The Togaviridae family belong to group IV of the Baltimore classification of viruses.

Viruses in this family are classified as Type IV viruses in the Baltimore classification, and are part of the luteovirus supergroup.

It has a negative sense single stranded RNA ( ssRNA ) genome, and so is classified as a class V virus under the Baltimore classification system.

Under the Baltimore classification scheme, the Caudovirales are group I viruses as they have double stranded DNA ( dsDNA ) genomes, which can be anywhere from 18, 000 base pairs to 500, 000 base pairs in length.

In biology and immunology, an alphavirus belongs to the group IV Togaviridae family of viruses, according to the system of classification based on viral genome composition introduced by David Baltimore in 1971.

At any rate, Manchester did not lag far behind the first commercial system which was set up in 1844 between Baltimore and Washington.

* 1958 – Final run of the Baltimore and Ohio Railroad's Royal Blue from Washington, D. C., to New York City after 68 years, the first U. S. passenger train to use electric locomotives.

In 1983, the building became the official museum of the Baltimore Orioles, which signed Ruth to his first professional contract.

After the season ended, the Orioles showcased altered uniforms, with a circular ' Maryland ' patch added to the left-hand sleeve of all jerseys and the grey road jerseys displaying Baltimore across the chest for the first time since 1972.

The station has previously carried the team from their arrival in Baltimore in 1954 through 1978 ; in the first four seasons, WJZ-TV shared coverage with WMAR-TV and WBAL-TV.

#* 2 children from first marriage, to Betsy Patterson of Baltimore, including:

While the first application of the term " clipper " in a nautical sense is by no means certain, it seems to have had an American origin when applied to the Baltimore clippers of the late 18th century.

The first ships to which the term " clipper " seems to have been applied were the Baltimore clippers.

The first attempt at building a larger swift vessel was in America with the Ann McKim, 494 tons OM, built on the enlarged lines of a Baltimore clipper, with sharply raked stem, counter stern and square rig.

The first dental college, Baltimore College of Dental Surgery, opened in Baltimore, Maryland, USA in 1840.

* 1958 – " Greatest Game Ever Played " – Baltimore Colts defeat the New York Giants in the first ever National Football League sudden death overtime game at New York's Yankee Stadium.

Before entering West Point, Poe moved back to Baltimore for a time, to stay with his widowed aunt Maria Clemm, her daughter, Virginia Eliza Clemm ( Poe's first cousin ), his brother Henry, and his invalid grandmother Elizabeth Cairnes Poe.

* 1827 – The Baltimore & Ohio Railroad is incorporated, becoming the first railroad in America offering commercial transportation of both people and freight.

The Baltimore News Post reported in 1957 that had Singer's arguments about the need for satellites been heeded, the U. S. could have beaten Russia by launching the first earth satellite.

Hearst began acquiring radio stations in the 1920s, and in 1948, he became the owner of one of the first television stations in the country, WBAL-TV in Baltimore.

The Colts played their first season in Baltimore in 1953, where the team complied a 3 – 9 record under first year head coach Keith Molesworth.

The franchise struggled during the first few years in Baltimore, with the team not achieving their first winning record until the 1957 season.

Baltimore went on to win the first post-merger Super Bowl ( Super Bowl V ) defeating the National Football Conference's Dallas Cowboys 16 – 13, on a Jim O ' Brien field goal with five seconds left to play.

The Colts finished 0 – 8 – 1 in the strike-shortened 1982 season and earned the team the right to select Stanford quarterback John Elway with the first overall pick, but Elway refused to play for Baltimore, and using leverage as a draftee of the New York Yankees baseball club, forced a trade to Denver.

The Colts won their first two playoff games against the Kansas City Chiefs and the Baltimore Ravens to return to the AFC Championship Game for the first time since the 2003 game, and they would face the same opponent in the New England Patriots.

In 1958 Baltimore played its first NFL Championship Game against the 10 – 3 New York Giants.