منابع مشابه
Caught in the act
Along with replication and mutability, living beings are set apart from the mineral background they inhabit by their metabolism—their ability to catalyse chemical reactions. Since Linus Pauling first proposed that these reactions are made pos sible by enzymes that recognize and bind tightly to their substrates at a crucial transi tion point [1], it has become increasingly clear that understan...
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Mutual fund providers serve two principals with opposing interests: their owners, who want them to maximize profits, and their fund shareholders, who want them to maximize fund returns. I investigate what role is played by customer power and information, as well as by competition among fund providers in influencing the balance of power between these two opposing principals. Using a data set of ...
متن کاملSynthetic Biology: Caught
Novel artificial genetic systems with twelve bases instead of four. 1 Bacteria that can be programmed to take photographs 2 or form visible patterns. 3 Cells that can count the number of times they divide. 4 A live polio virus " created from scratch using mail-order segments of DNA and a viral genome map that is freely available on the Internet. " 5 These are some of the remarkable, and occasio...
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Time to split A yeast cell can stand out from the crowd by hastening or delaying meiosis. A yeast master regulator protein helps cells determine when to enter meiosis, as Iftach Nachman, Aviv Regev, and Sharad Ramanathan (Harvard University, Cambridge, MA) report. Starvation spurs yeast to begin meiosis. But the process is complicated and irreversible, and cells that start too early or too late...
متن کاملCaught in the Act?
Galaxies are thought to be surrounded by massive halos of dark matter, each outweighing its galaxy by a factor of about eight. The visible part of a galaxy, occupying the inner 10% of the halo, consists of a mixture of stars and gas. Galaxies harbour a giant black hole at their centres, which in some cases is actively fuelled as it sucks in surrounding gas. In especially active galaxies, called...
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ژورنال
عنوان ژورنال: Academic Questions
سال: 2020
ISSN: 0895-4852,1936-4709
DOI: 10.1007/s12129-019-09848-8