Emms retired after the pair lost in the quarter-finals at the Beijing Games in August.
Rupp finished out of the medals in the 10, 000 meters at the Beijing Games in 2008.
Uchishiba brought gold medals home from the Athens and Beijing Games, and was feted as a national hero.
Ostapchuk, 31, had finished third at the Beijing Games in 2008 and second at last year's world championships.
In men's BMX cycling, Latvia's Maris Strombergs won the gold, defending his Olympics title won at the Beijing Games.
The 28-year-old swimmer's phenomenal Paralympics victories at the 2008 Beijing Games means his all-time haul is 11 gold medals.
Houvenaghel was runner-up to Great Britain team-mate Rebecca Romero at the Beijing Games.
The country won 47 medals at the Beijing Games in 2008, finishing fourth behind China, the United States and Russia.
After the controversies during the Beijing Games, FIG began requiring athletes to apply for licenses, which verified ages based on passports.
And IOC officials are already pointing out how the Beijing Games have apparently inspired more volunteerism, still relatively rare in modern Chinese society.
He has put behind him the disappointment of not being selected for the Beijing Games and a serious knee injury in recent years.
BBC: Paralympics gold for Aled Davies in discus 'tremendous'
The two teams met in the final at the Beijing Games in 2008, with the U.S. beating Spain to win its 13th Olympic title.
Lopez Lomong, who made the Beijing Games in the 1, 500 in 2008, showed he still has the speed in the mile, holding off defending champ Matthew Centrowitz.
Nepal had agreed to a Chinese request to not allow Everest expeditions in the buildup to the Beijing games when the Olympic flame was being taken up Everest.
Pennell realized this even more starkly, as he realized that the technology landscape for the Beijing Games was substantially different than it would be for London 2012.
Perhaps the swiftest way to encapsulate his Olympian presence is to point out that one of the official pandas of the Beijing Games has been named after him.
Two Chinese Olympians that made it into the top 10 last year following China's successful showing at the 2008 Beijing games dropped from the top ranks this year.
Among the Beijing Games' other disappointments: American sprinter Tyson Gay.
During the Beijing Games, Bela Karolyi, the former coach of famed gold medalist Nadia Comaneci, said the only solution to age disputes was to abandon the age minimum altogether.
Mantek was pleased with the results when he used the Reiss system at the 2008 Beijing Games, where Steiner, a 29-year-old, 320-pound super-heavyweight, won Olympic gold after taking silver at the European championships.
After his heroics in 2004, Gonzalez had the ultimate honor bestowed upon him prior to the start of the Beijing Games when he was asked to carry Chile's flag for the opening ceremony.
She made her last comeback at the Beijing Games in 2008, where she earned a silver medal in the 50-meter freestyle and the title of the oldest American woman to swim for the U.S. team.
This new trend will be emphasized by the upcoming Olympics, with the number of users on Facebook having risen to 900 million -- nine times the figure it was for the Beijing Games of 2008.
Having been pipped to the all-around title (which takes into account performances on all four pieces of apparatus) by team-mate Nastia Liukin, Johnson exacted revenge on the balance beam, the final women's gymnastics event of the Beijing Games.
BBC: US gymnast Shawn Johnson seeks focus to succeed in 2012
She said she had discussed the issue with Olympic gold medallist Victoria Pendleton, who was only able to compete in one sprint cycle event at last year's Beijing Games while team-mate Chris Hoy won three golds in the discipline.
But if the appeal is successful it could clear the way for Gatlin to receive a two-year ban for the 2006 test and become eligible to compete in May, a month ahead of the US Olympic trials for the Beijing Games.
BBC: Gatlin won the 100m title at the Athens Olympics in 2004
The 2008 Beijing Games provided the latest disappointments, with a men's team sporting the likes of two-time world player of the year Ronaldinho and future AC Milan star Alexandre Pato crashing out in the semifinals to Argentina, losing 3-0 and ending up with the bronze medal.
CNN: Golden goal: Can boys from Brazil achieve Olympic dream?
The 18-year-old gymnast won gold on the balance beam for the United States at the Beijing Games in 2008, alongside three more silver medals, installing herself as a poster child of US sporting success and garnering a host of accolades, as much for her likeable personality as her achievements.
BBC: US gymnast Shawn Johnson seeks focus to succeed in 2012
The defender has not been included in the Australian under-23 team for the Beijing Olympic Games.
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