منابع مشابه
Wnt Down, Tumors Wind Up?
In mouse intestinal tumors induced by the inhibition of APC, the restoration of APC function causes complete tumor regression with normal differentiation and return of stem cell function irrespective of whether tumors also carried mutations in Kras and p53. These findings by Dow et al. validate the Wnt pathway as an exquisite target for intervention.
متن کاملThe Impact of Future Offshore Wind Farms on Wind Power Generation in Great Britain
In the coming years the geographical distribution of wind farms in Great Britain is expected to change significantly. Following the development of the “round 3” wind zones (circa 2025), most of the installed capacity will be located in large offshore wind farms. However, the impact of this change in wind-farm distribution on the characteristics of national wind generation is largely unknown. Th...
متن کاملA Spin-down Power Threshold for Pulsar Wind Nebula Generation?
A systematic X-ray survey of the most energetic rotationpowered pulsars known, based on spin-down energy loss rate, Ė = Iωω̇, shows that all energetic pulsars with Ė > Ėc ≈ 3.4 × 10 36 erg s are X-ray bright, manifest a distinct pulsar wind nebula (PWN), and are associated with a supernova event, either historically or via a thermal remnant, with over half residing in shell-like supernova remnan...
متن کاملMarginal greenhouse gas emissions displacement of wind power in Great Britain
There is considerable uncertainty over the effect of wind power on the operation of power systems, and the consequent greenhouse gas (GHG) emissions displacement; this is used to project emissions reductions that inform energy policy. Currently, it is approximated as the average emissions of the whole system, despite an acknowledgement that wind will actually displace only the generators operat...
متن کاملEvolution of primary frequency control requirements in Great Britain with increasing wind generation
With the increase of renewable generating capacity following the ambitious targets set by many governments for the next decades, there will be major changes in power generation and challenges for balancing transmission grids. In particular, primary frequency control requirements will be increased following a potential reduction of system inertia. An assessment of the frequency response reserve ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1977
ISSN: 0028-0836,1476-4687
DOI: 10.1038/267749b0