Ham, from Arnhem, was a medical student in Leiden after 1671. He studied with Prof. Theodore Craanen, who had visited Leeuwenhoek. In 1677, Ham brought ejaculate from a gonorrhoea …

Jonathan Daniel Hamm (born March 10, 1971) is an American actor. He is best known for his role as Don Draper in the period drama series Mad Men (2007–2015), [1][2] for which he won …

乔·哈姆（Jon Hamm），1971年3月10日出生于美国密苏里州圣路易斯，美国演员，毕业于密苏里大学表演专业。 1998年，参演个人首部电影《The Hughleys》。 2000年，由其参演的家庭剧 …

Jon Hamm is an American actor and producer from St. Louis, Missouri who is known for playing Don Draper in Mad Men. He also played Mister Sinister in a deleted scene of The New …

The Visit of Johan Ham Three years later, in October 1677, an excited young man knocked on Van Leeuwenhoek’s door. Johan Ham was a 23-year-old student of philosophy in Leiden. It …

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1977年10月16日 · [Johan Ham, discoverer of spermatozoa] Clipboard, Search History, and several other advanced features are temporarily unavailable. Skip to main page content An …

at Leiden, Johan Ham, brought him a specimen ostensibly of semen in which Ham himself had found small animals with tails, which Leeu- wenhoek now observed as well.7 Leeuwenhoek …

2022年12月30日 · Sperm cells have intrigued biologists since they were first observed nearly 350 years ago by Antonie van Leeuwenhoek and Johan Ham. The discovery of these ‘animalcules’ …

2008年8月13日 · The Royal Society of London officially credited Leeuwenhoek and his student Johan Ham with the discovery of sperm cells (then called seminal animalcules) in 1677.