Word: bacterias
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...very young embyro. This demonstrates that stable messenger RNA for making an embryo had been stored in the egg's cytoplasm. Storage may well be the level where the critical choice might reside in the cells of higher organisms. This is not the case for very simple cells like bacteria, where the genetic information is transcribed into RNA and immediately translated into protein. Kafatos explained that, due to the great instability of the bacterial world, bacteria do not think ahead because they must be able to adjust continually to constantly changing conditions. The DNA sends a steady stream of messenger...
...greedy organisms buried in sedimentary rock (as the source of crude oil, for example), thus permitting the atmosphere to become enriched to a life-sustaining mix of 20% oxygen, plus nitrogen, argon, carbon dioxide and water vapor. With miraculous precision, the mix was then maintained by plants, animals and bacteria, which used and returned the gases at equal rates. About 70% of the earth's oxygen is thus produced by ocean phytoplankton: passively floating plants. All this modulated temperatures, curbed floods and nurtured man a mere 1,000,000 or so years...
Industry already devours water on a vast scale-600,000 gal. to make one ton of synthetic rubber, for example-and the resultant hot water releases the dissolved oxygen in rivers and lakes. This kills the oxygen-dependent bacteria that degrade sewage. Meanwhile, the country's ever-mounting sewage is causing other oxygen-robbing processes. By 1980, these burdens may well dangerously deplete the oxygen in all 22 U.S. river basins. The first massive warning is what happened to Lake Erie, where overwhelming sewage from Detroit and other cities cut the oxygen content of most of the lake...
...Though one-third of U.S. sewage systems are below health standards, improving them may also kill lakes. The problem is that treated sewage contains nitrate and phosphate, fertilizing substances widely used in agriculture that make things worse in overfertilized lakes. Though nitrate is normally harmless in the body, intestinal bacteria can turn it into nitrite, a compound that hinders hemoglobin from transporting oxygen to the tissues, causing labored breathing and even suffocation...
...picks up additional moisture from the wicks-leaving the solids behind. It is next passed through a charcoal filter to remove odors and then through a condenser, which causes the moisture to form water droplets. Finally, the reclaimed water is sent through a commercial filter to remove any remaining bacteria and organic materials...