presumably so the cell can then divide. Since cdc2 protein occurs in all cells (human cdc2 protein is said to be 63 percent similar to that of the most primitive yeast!) it probably goes back to early days of cellular life on earth. Other proteins controlling the various changes in the cell cycle are being investigated, and may have important applications in the research of cancer, where cell ...
Most pulsars rotate about once a second, but these unusual pulsars rotate so fast that the radio beacon is sent at 13 percent of the speed of light. Scientists are now hypothesizing that both the blue stragglers and the millisecond pulsars may be the result of collisions in areas of extreme star density, common in the this unusual cluster.It turns out that not all globular clusters are old. ...
sources. Less than a year ago, the Rosat satellite's X-ray telescope found many thousands of X-ray sources over 90 percent of the sky. The data is being examined to find out whether the X-ray sources are objects previously unknown or already found by other telescopes. Rosat's current investigation of X-ray-emitting objects may explain much about the birth, evolution, functioning and death of ...
however, that entered Titan's atmosphere sent back the astounding news that it was largely nitrogen, maybe up to 90 percent nitrogen. That was what made Titan's atmosphere so dense.This is interesting because among the known bodies in the solar system, only Titan and Earth have atmospheres that are largely nitrogen. The giant planets have atmospheres that are mostly hydrogen. Mars and Venus ...
'프로'를 확대 연역한 '프로테이지'(protage)까지 만들어 쓰고 있는데 이것은 '퍼센테이지'(percentage)가 옳은 표현이다.만일 퍼센트 퍼밀이 외래어라서 마땅하지 않다면 퍼센트는 푼(分), 퍼밀은 이(厘)로 하는 것이 어떨까. 우리는 전래로 1할(割)은 1/10, 1푼(分)은 1/100, 1리(厘)는 1/1,000로 써왔기 때문이다 ...
red dwarfs.It is not at all likely that red dwarfs can support life. For that you need a sun-like star, but only 10 percent of the stars in our galaxy are sun-like.Sirius, incidentally, is considerbly larger and brighter than our sun and it can't support life, either. For one thing, it sould not remain on the "main sequence"(the majority of stars fall into the "main sequence" category on a ...
in another way. Most luminous objects are luminous in the visible light. This new luminous object, however, emits 99 percent of its energy in the infrared.The question is now: What can possibly be the cause of all this infrared luminosity?The astronomers who discovered the phenomenon suggest two possible causes. One, there can be a quasar buried at the core of the cloud producing the energy, ...
and is less than the density of pure ice.Apparently, these satellites are merely piles of icy debris, with some 30 percent of their structure consisting of empty space. Is it possible that these satellites are actually conglomerations of ice particles from Saturn's rings?That is not so unbelievable. Janus is 220 by 160 kilometers in size, and Epimetheus is 140 by 100 kilometers. These and ...
of Lake Baikal and its presence here and there in the water will tell us how it circulates.Weiss discovered that 12.5 percent of the deep water in Lake Baikal is renewed each year, so that every eight years or so, the water in the lake's depths has a fresh supply of oxygen.An even more important discovery was made in Lake Baikal in the mid-1990 by a team led by Kathleen Crane of Hunter ...
from chimpanzees and gorillas, and found a 9.6 percent difference between chimpanzees and human beings, but a 13.1 percent difference between chimpanzees and gorillas.More and more, people are beginning to believe that chimpanzees and human beings are on one side of a great gulf, while the other apes (and, of course, other forms of life) are on the other side.But if chimpanzees share so many ...