꼽히는 ‘종의 기원’에서 ‘생명의 나무(tree of life)’라는 이름의 계통수를 선보였다. 다윈의 계통수가 특별했던 건 진화라는 개념을 기준으로 삼았기 때문이다. 계통수의 정점에는 공통조상을 두고, 그 아래 종이 분화한 순서대로 그려나갔다. 새로 등장한 종은 나뭇가지가 새로 돋아난 것으로 ...
밝혀준 데 있었다. 우리는 이를 ‘생명의 나무(tree of life)’라고 부른다. 그는 존재를 일렬로 줄 세우려는 모든 전통에 종지부를 찍는다. 그의 ‘생명의 나무’에서는 침팬지와 인간이 600만 년 전쯤에 어떤 공통 조상에서 갈라져 나온 사촌지간으로 인식된다. 즉, 침팬지도, 인간도, 개미도, 고래도, ...
세포의 뿌리를 하나로 합친 ‘생명의 나무(tree of life)’를 그리는 데 성공했다고 ‘사이언스 어드밴시스’ 9월 25일자에 밝혔다.생명의 나무는 모든 생명체의 진화계통을 정리한 표로, 지금까지 바이러스는 포함시키지 않았다. 종이 워낙 다양하고 유전자 변이가 잦아 염기서열을 토대로 ...
하나는 홍조류의 계통수를 구축하는 ‘Red Algal Tree of Life’ 과제로 5년간 진행된다. 현재 홍조류는 6000여 종이 알려져 있는데 이 가운데 500여 종의 상관관계를 규명할 계획이다. 그리고 16종은 게놈까지 분석한다. 윤 교수는 지난해 성균관대에 부임했지만 이 프로젝트가 끝날 때까지는 비글로연구소 ...
fungus fights cancer.Cancer is one of the scourges of humanity. Life has been perilous for those of us who have had, or whose ... give the patient taxol, an anti-cancer drug made from the bark of Pacific yew trees. Taxol is fiercely expensive and very hard to get, for yew trees are few.Since taxol is useful for other tumors as well, the demand has far exceeded the supply. Even thorough ...
so busy studying newts that he runs into trouble with ordinary life. Then there are those fairy-tale princes who get turned into ... stronger than morphine.Even more exciting is the recent report of Australian scientists who analyzed skin secretions from the Australian tree frog, a charming blue animal with white underparts. The Australians found compounds with antibacterial and antiviral ...
s true that other primates don't favor either hand in ordinary life, under some test conditions they do. They need to use their right ... them to see what they're doing. Scientists postulate that their tree-dwelling ancestors held onto branches with the right hand and ... the right hand than the left.To me, the most interesting aspect of the handedness problem is that both humans and great ...
may weigh up to 150 tons.(Some plants are heavier still but most of a tree is supporting woody tissue that is not truly alive, whereas ... of living tissue.)In a way, this puts us in our place. After life began, about 3.5 billion years ago, life forms remained single-celled and prokaryotic for over two billion years. Only about 1.4 billion years ago, the third grand division, Eucarya, ...
wheel-barrow to composing a symphony, from chopping down a tree to alphabetizing a set of file cards─and doing it all with the same brain and the same ... a terrible drawback for the human beings since the exigencies of life usually compel a person to spend most of his time and his magnificently generalized body in becoming specialized. Often, he is compelled to do jobs that totally ...
for a long period. Such a hugh strike might kill most or all of life and, indeed, such a huge strike is thought by many to have wiped ... 908, a much smaller strike in central Siberia knocked down every tree for 20 miles around, but it was a desolate, uninhabited region and nobody was killed.In fact, there is no record in historic times of any human being being killed by a meteoric strike ─ ...