Recovery of a marine chemolithotrophic ammonium-oxidizing bacterium from long-term energy-source deprivation

1988 ◽  
Vol 34 (12) ◽  
pp. 1347-1350 ◽  
Author(s):  
Brian H. Johnstone ◽  
Ronald D. Jones
Keyword(s):  
Energy Source ◽  
Electron Transport ◽  
Transport System ◽  
Energy Sources ◽  
Stored Energy ◽  
Constant Rate ◽  
Term Energy ◽  
Number Of Cells ◽  
Reducing Potential

The marine chemolithotrophic ammonium-oxidizing bacterium Nitrosomonas crytolerans was monitored during recovery after 5 weeks of energy-source deprivation. The organism responded immediately to the addition of [Formula: see text], producing [Formula: see text] at a constant rate. The cells used stored energy sources (ATP) and reducing equivalents (possibly NAD(P)H + H+) to immediately begin biosynthesis. However, these sources were quickly exhausted. Consequently, anabolism (14CO2 incorporation) decreased until levels of ATP and reducing potential were increased through oxidation of [Formula: see text]. Electron transport system activity steadily increased after the addition of [Formula: see text]. The increases in activities were greater than the increase in the total number of cells, suggesting that the increase in activity of the whole culture was due to either a physiological change in each cell or a reactivation of cells which had entered dormancy during energy-source deprivation. These results indicate that N. cryotolerans is well adapted to oligotrophic environments.

Environmental Implications of the Use of Fusion Power

1980 ◽  
Vol 7 (4) ◽  
pp. 289-294 ◽  
Author(s):  
John P. Holdren
Keyword(s):  
Energy Use ◽  
Fusion Reactor ◽  
Nuclear Fission ◽  
Term Limits ◽  
Stored Energy ◽  
Environmental Implications ◽  
Limits To Growth ◽  
Term Energy ◽  
Energy Options

Long-term limits to growth in energy-use will be imposed not by inability to expand supply but by the rising environmental and social costs of doing so. These costs will therefore be central issues in choosing long-term energy options. Energy from nuclear fusion, like solar energy, is not one technology but many. Some of the fusion possibilities seem likely to have very attractive environmental characteristics; others may be little better in these regards than nuclear fission.Issues in fusion-reactor design that are crucial from the environmental standpoint include: size of tritium inventory and pathways for its release; nature and configuration of materials that are subject to neutron activation; forms and quantities of the stored energy that are internal to the reactor, and the nature of potential links between fusion technology and nuclear weaponry.

scholarly journals Energy Conservation, Efficiency and Demand Side Management

2012 ◽  
pp. 294-299
Author(s):  
Pappu Kumar Singh ◽  
A. K. Mahapatra ◽  
U. Prasad
Keyword(s):  
Energy Conservation ◽  
Energy Security ◽  
Energy Use ◽  
Economic Security ◽  
Energy Sources ◽  
Short Term ◽  
Term Energy ◽  
Conservation Efficiency ◽  
Efficient Energy Use

The efficient use of energy is the key to maintaining our world’s resources; indeed our future depends on it. Energy conservation can be achieved through increased efficient energy use, in connection with decreased energy consumption and reduced consumption from conventional energy sources. Energy conservation can result in increased financial capital, environmental quality, national security, personal security, and human comfort. Individuals and organizations that are direct consumers of energy choose to conserve energy to reduce energy costs and promote economic security. In view of the nation's energy security interests, it is important to be increasing alternative fuel capability throughout the fleet. The need to ensure the nation's long-term energy security is of such vital concern that it takes precedent over possible short-term convention energy sources consumption and environmental impacts.

scholarly journals A Novel Fuel-Cell Electric Articulated Vehicle and Its Drop-and-Pull Transport System

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3632
Author(s):  
Yanwei Liu ◽  
Zhenye Li ◽  
Yuzhong Chen ◽  
Kegang Zhao
Keyword(s):  
Energy Source ◽  
Fuel Cell ◽  
Transport System ◽  
Energy System ◽  
Energy Sources ◽  
Energy Management Strategy ◽  
Power Sources ◽  
Power Battery ◽  
Capacity Degradation ◽  
Articulated Vehicle

Drop-and-pull transportation can repeatedly utilize tractors with different trailers and reduce costs, carbon emissions, and the number of tractors to purchase and use. Fuel-cell electric vehicles (FCEV) possess high power and long drive endurance. These performance characteristics complement the performance requirements of drop-and-pull transportation of heavy loads and long mileage. This paper proposes a novel fuel-cell electric articulated vehicle featuring three power sources: fuel cell, power battery, and ultracapacitor. Then, based on the proposed vehicle, we expound on a highly efficient and flexible transport system. To compare economics and durability of fuel-cell electric trailers with two energy sources (i.e., fuel-cell-battery) and three energy sources, we developed and simulated a rule-based energy management strategy under driving conditions. The results indicate that, although similar levels of fuel economy and capacity degradation of the fuel cell occur for the proposed vehicle and its two-energy-source counterpart, the ampere–hour throughput of three-energy-source vehicles was 64% lower than that of two-energy-source vehicles, which indicates the introduction of the ultracapacitor in fuel-cell-battery electric articulated vehicles can offer significant protection to the power battery. This result shows that the three energy sources increase the service life of the energy system.

Business Models With H2

2017 ◽  
pp. 85-120
Keyword(s):  
Energy Source ◽  
Renewable Energy ◽  
Environmental Impact ◽  
Business Models ◽  
Renewable Energy Sources ◽  
Energy Transition ◽  
Energy Sources ◽  
Energy Prices ◽  
In The Beginning

Energy transition from a carbon energy driven world to a decarbonized world (H2) is essential for the living for our next generations. Our existing energy source with contents in the beginning (1850) nearly only the element C are used with all their consequences for the burning process and environmental impact. Nowadays the C element in our present energy sources are getting less and less. The environmental impact using fossil energy is huge and with the climate change more and more deadly for the inhabitants on the earth. Producing H2 as a sustainable and renewable energy is only possible using renewable energy sources like PV, Wind, Hydro, Biomass. With today's technology and the constant falling energy prices since the last 20 years H2 is now an alternative secondary energy source for a substitute for fossil sources. Using H2 will give new and unique business advantages. With these business advantages, new and innovative business models can be designed and developed. These novel approaches can be very sensitive to external influences. This destructives situations are making these BM very fragile. Finding ways to stabilize these on a long term without aid from the outside the key for success are new innovative technologies and new innovative BM.

Sustainable Energy Beyond Carbon

2018 ◽  
Author(s):  
E. L. Wolf
Keyword(s):  
Geothermal Energy ◽  
Energy Resources ◽  
Energy Sources ◽  
Fusion Reactors ◽  
The Earth ◽  
Clean Air ◽  
Term Energy ◽  
Abundant Supply ◽  
Life On Earth

Energy from the Sun leads to direct heating of the Earth, and also to secondary forms of energy in winds, waves and hydroelectricity. Long-term energy resources in the Earth and its motions include tides, geothermal energy, fission fuels, and in deuterium that may potentially be used to power nuclear fusion reactors. We are interested in energy sources that will last on a time scale of thousands of years, and further, that will not interfere with other important aspects of life on Earth, such as clean air and water in abundant supply. Plants grew by photosynthesis starting in the carboniferous era, about 300 million years ago, and the decay of some of these, instead of oxidizing back into the atmosphere, occurred underground in oxygen-free zones.

Power Projects and Covid-19: A Practical Analysis of the Relevance of Force Majeure Clauses under the Standardised Power Purchase and Implementation Agreements of Uganda

2020 ◽  
Vol 1 (2) ◽  
pp. 189-193
Author(s):  
Aisha Naiga ◽  
Loyola Rwabose Karobwa
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
The State ◽  
Energy Sources ◽  
Policy Goals ◽  
Force Majeure ◽  
Practical Analysis ◽  
Energy Justice

Over 90% of Uganda's power is generated from renewable sources. Standardised Implementation Agreements and Power Purchase Agreements create a long-term relationship between Generating Companies and the state-owned off-taker guaranteed by Government. The COVID-19 pandemic and measures to curb the spread of the virus have triggered the scrutiny and application of force majeure (FM) clauses in these agreements. This article reviews the FM clauses and considers their relevance. The authors submit that FM clauses are a useful commercial tool for achieving energy justice by ensuring the continuity of the project, despite the dire effects of the pandemic. Proposals are made for practical considerations for a post-COVID-19 future which provides the continued pursuit of policy goals of promoting renewable energy sources and increasing access to clean energy, thus accelerating just energy transitions.

Sign in / Sign up

Export Citation Format

Share Document