Most charging systems depend on fairly primitive systems for topping up batteries.
Most of the transport systems depend on outer membrane localized TonB-dependent transporters (TBDTs), a periplasma-facing TonB protein and a plasma membrane localized machinery (ExbBD).
On the one hand, the benefits of having such systems depend on their efficacy and the frequency of infections.
Thus the systems depend on endless population growth, but endless population growth is probably not possible and certainly not desirable.
LOS ANGELES — Even though new video game systems depend on technological innovation, players are a conservative lot, suspicious of change.
Though many mollusks have shells, most molluscan muscle systems depend on the principle of the hydrostatic skeleton.
But the Argentine experience actually underscores the degree to which all modern financial systems depend on confidence, and the problems that erupt when that confidence disappears.
Fares typically cover less than half the cost of each ride, and the state and local taxes that most systems depend on have been plummeting.
Their credit systems depend on careful analysis of the cashflow and business prospects of every client, and even competitors concede that they are unusually good at detecting problems before loans are granted.
Their problem is that fare-box revenue accounts for only a fifth to a half of the operating revenue of most transit systems — and the sputtering economy has eroded the state and local tax collections that the systems depend on to keep running.
Maria van der Hoeven, chief executive of the IEA, the world's gold standard for energy research, warned: "The reliability and sustainability of our future energy systems depend on investment, but this won't materialise unless there are credible policy frameworks in place as well as stable access to long-term sources of finance.
