Jonathan Trent: Energy from Floating Algae Pods
Call it "fuel without fossils": Jonathan Trent is working on a plan to grow new biofuel by farming micro-algae in floating offshore pods that eat waste-water from cities. Hear his team's bold vision for Project OMEGA (Offshore Membrane Enclosures for Growing Algae) and how it might power the future. Not only does Jonathan Trent grow algae for biofuel, he wants to do so by cleansing waste-water and trapping carbon dioxide in the process. And it’s all solar-powered. (14:45)
Market Pulse: 12/12/12, a red letter day for Greek bonds
It's perhaps fitting that today Greek bond yields have a 12% handle for the first time since April last year. And is 88 years enough for progress on the "fiscal cliff" talks?
ECONOMY 2013: Luxury buyer weaker than last year - Saks CEO
Dec. 12 - Saks CEO Stephen Sadove says the high-end consumer is still reasonably healthy but not as strong as last year and feels the Fiscal Cliff's biggest impact will be on consumer sentiment.
Cultmapas urbanos [Urban cultmaps]
This research aims to address the catalog urban interventions as graffiti, stencil and sticker spotted in association with the city. As a result, they develop artistic urban mappings which assemble a structure marking the artistic manifestations. The urban arts, are georeferenced and eventually become part of a catalografia which can be viewed on the web entitled Cultmap art.
Kleuters maken een knuffel : Stappenplan De kleuters maken een knuffelbeer. Eerst maken ze aan de hand van het stappenplan het hoofd, dit wordt op een groot blad gekleefd. Onder het hoofd wordt dan een lichaam getekend dat ze met watten mogen beplakken, zodat ze een zachte beer …
Die Welt anderer Kulturen (1)
Die Welt anderer Kulturen (1).
5 Summary Eutrophication is a process in which an ecosystem accumulates mineral nutrients. It can occur naturally, but is usually associated with human activity that releases nutrients into the environment. Anthropogenic eutrophication has caused a widespread loss of biodiversity in many systems. Recent attempts to reverse the process are proving difficult and expensive. Symptoms of eutrophication are most readily seen in aquatic sys
3.2.5 Sediments Sediments have a variable but complex role in nutrient cycling in most aquatic systems, and are a potential ‘internal’ source of pollutants. Release of phosphorus from lake sediment is a complex function of physical, biological and chemical processes and is not easy to predict for different systems. Nitrogen is not stored and released from sediments in the same way, so its turnover time within aquatic systems is quite rapid. Nitrogen concentrations tend to fall off relatively quickly foll
2.4.2 Saltmarshes Marsh plant primary production is generally nitrogen limited, so saltmarsh vegetation responds readily to the artificial eutrophication that is now so common in nearshore waters. Eutrophication causes marked changes in plant communities in saltmarshes, just as it does in freshwater aquatic and terrestrial systems. Biomass production increases markedly as levels of eutrophication increase. Increases in the nitrogen content of plants cause dramatic changes in populations of marsh plant consumer
1.2 Resource availability and species diversity A wide range of ecosystems has been studied in terms of their species diversity and the availability of resources. Each produces an individual relationship between these two variables, but a common pattern emerges from most of them, especially when plant diversity is being considered. This pattern has been named the humped-back relationship and suggests diversity is greatest at intermediate levels of productivity in many systems (Figure 1.5). 6.2 Non-covalent bonding in site-specific binding The affinity of a protein for DNA is determined in thermodynamic terms by the free energies of the individual components compared to the free energy of the DNA-protein complex. DNA binding proteins, which contain different binding motifs, demonstrate a wide range of thermodynamic strategies. The affinity of a site-specific DNA binding protein for its specific DNA sequence is generally of the order of 104−107 times greater than its affinity for non-specific sequen 5.1 Introduction The integrity of DNA as a genetic material is of paramount importance to an organism, and a multitude of proteins exist that serve to prevent or reverse damage to the DNA. However, like all biological macromolecules, DNA decomposes spontaneously. The reasons for the ease of decomposition of DNA are intimately linked to the chemical structures of the constituent bases and phosphodiester-linked sugars. The limited stability of DNA may be integral to the molecular basis of evolution. If DNA were 4.1 The varied structures of RNA RNA is a versatile cellular molecule with the ability to adopt a number of complex structural conformations. Although RNA is often thought of as a single-stranded molecule it is actually highly structured. Torsional energy can be taken up by alternative DNA conformations The energy introduced into DNA by twisting has great potential as a regulatory mechanism, since the free energy can be stored in a variety of different high-energy conformations along the chain. Base stacking Although the base pairing brought about by hydrogen bonding is responsible for the specificity of the base interactions, much of the stability of a duplex nucleic acid is due to interactions that result from base stacking. If you look back at Figure 3a, you will notice that, when seen from a side view, our schematic r Acknowledgements Except for third party materials and otherwise stated (see terms and conditions). This content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit: 2.6 Obesity and ageing So, it seems that a part of the explanation for Ron's obesity, and the health problems that have led him to seek medical advice, may relate to the environment in which he is living, and more specifically the diet that he has chosen. It may also be a diet that is especially effective in activating the reward circuits in Ron's brain. However, Ron is also in his later middle age. A longitudinal study of people of this age in the USA suggests that average body weight increases by 1–2 kg per dec 1.5 Obesity At the time of writing (2004) 20% of the adult population of the UK is classified as obese. The number of obese children has doubled since 1982, 10% of six year olds and 17% of fifteen year olds are now classified as obese. As shown in Table 4, obesity is recognized when the BMI exceeds 30 and occurs quite simply wh 1.1 The components of a balanced diet A balanced diet contains six key nutrient groups that are required in appropriate amounts for health. These groups are outlined below. Proteins are involved in growth, repair and general maintenance of the body. Carbohydrates are usually the main energy source for the body. Lipids or fats are a rich source of energy, key components of cell membranes and signalling molecules, and as myelin they insulate neurons (nerve cells 4.2 The terrestrial carbon cycle Figure 1.10 shows the rates of natural carbon exchange between the terrestrial system and the atmosphere.
SAQ 19
SAQ 14
Author(s):
