[DEBUG-WINDOW 처리영역 보기]
즐겨찾기  |  뉴스레터  |  오늘의 정보  |  e브릭몰e브릭몰 회원가입   로그인
BRIC홈 동향
설문조사
스폰서배너광고 안내  배너1
전체보기 Bio통신원 Bio통계 BRIC View BRIC이만난사람들 웹진(BioWave)
목록
조회 1791  인쇄하기 주소복사 트위터 공유 페이스북 공유 
The Moon Through The Trees
생명과학 ScienceNow (1998-04-16 00:00)

The diameter of tree seedlings may fluctuate with the tides, according to a paper in tomorrow's Nature. The changes are barely perceptible--only a few hundredths of a millimeter--but scientists say some influence of the moon might be moving water from living parts of cells to the cell walls and back again. If verified in big trees, the phenomenon could influence how certain high-grade wood is harvested.

This isn't the first time the moon has been found to influence plants. A wide variety of plants grow better if planted just before a full moon, says tree biologist and anatomist Ernst Zürcher of the Swiss Federal Institute of Technology in Zurich. But while measuring the growth of young trees under controlled temperature, humidity, and continuous darkness, Zürcher and his colleagues noticed a peculiar 25-hour cycle in the diameter of stems. The shape of the graph--with two peaks each cycle--reminded them of the regular water fluctuations in bore holes and the flow of springs, which are paced like the tides, but much more subtle.

When they compared their data on tree stem diameters with the local gravimetric curves--which mark the strength of gravity's pull on Earth due to the positions of the moon and sun--they found that the curves seemed to be synchronized. When the moon's pull was weakest, the trees were 5 to 10 micrometers wider than when it was at its strongest. The effect, which does not depend on the stem's orientation, was present even in stem sections cut off from the rest of the tree, as long as the cells remained alive. Zürcher says he suspects changes in the moon's pull may somehow drive the water from the cytoplasm into the cell walls and then back again, causing the subtle swelling and shrinking.

The location of the water could have an important effect on the drying and quality of harvested wood, Zürcher says. Indeed, he claims that loggers have traditionally paid attention to the moon, and some violin makers "consider special moon rhythms" when choosing wood. However, there is no known physiological mechanism that would be this responsive to the subtle tugging of the moon's gravity, says biomechanics expert Karl Niklas of Cornell University in Ithaca, New York. "It looks like there is a real phenomenon that is awaiting a biological explanation," he says. "But it needs to be replicated in a controlled situation."

Previous Story Next Story

의견올리기
작성자
목록
오송첨단의료산업진흥재단
5년전 오늘뉴스
[신기한 곤충이야기]212. 메탈리퍼가위사슴벌레 이야기
X 염색체와 관련된 동성애
사람 살리는 쥐(GEM)의 독백...성제경 서울대 수의대 교수, 국가마우스표현형...
연구정보중앙센터
위로가기
동향 홈  |  동향FAQ  |  동향 문의 및 제안
 |  BRIC소개  |  이용안내  |  이용약관  |  개인정보처리방침  |  이메일무단수집거부
Copyright © BRIC. All rights reserved.  |  문의 member@ibric.org
트위터 트위터    페이스북 페이스북   유튜브 유튜브    RSS서비스 RSS
에펜도르프코리아