Wednesday, October 15, 2014
Renewables vs nuclear energy What is better for climate change
Renewable energy certainly seems like the better solution than building more nuclear power plants, and this is not just because of the recent Fukushima accident. The accidents such as Fukushima and Chernobyl are rare but when they occur they are usually accompanied by massive environmental damage which is usually long-lasting, and difficult to clean up.
Nuclear power plants are extremely expensive to be built because they need to comply with number of different safety measures and also because they are technologically complex. Even choosing site for nuclear power station is very difficult because communities usually oppose having plant nearbye. Renewable energy technologies have been constantly dropping in prices, and its only matter of time before wind and solar become cost-competitive with fossil fuels, in fact if you calculate the total damage in environmental, social and health costs due to climate change and pollution then renewable energy is already better in terms of costs than fossil fuels.
The technologies used for nuclear power generation could be also used for the development of nuclear weaponry, and we must also not discount the possibility of terrorist attack, just imagine what could happen if some radical terrorist organization would take over the nuclear power plant.
Clean energy race is well on, and all countries of the world have been seriously considering their renewable energy options, in order to choose the one best suited for them. In many countries future nuclear power development has been pretty much abandoned and the golden age of nuclear power generation seems to be well behind us.
In the last 10-15 years, from 2000 upwards global renewable energy capacity has more than doubled. In 2012, in United States, renewable energy accounted for 56% of new electricity generation.
It would be wrong to say that we should abandon nuclear energy straight away because nuclear energy accounts to significant share of electricity generation in many countries of the world. The solution is to focus primarily on renewable energy sources such as solar and wind when discussing our energy future. Nuclear power had a pretty good run, and once current nuclear power plants end their lifetime we should consider replacing them with some of various renewable energy solutions.
Saturday, September 27, 2014
What Is Eco Friendly Technology
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Sunday, September 14, 2014
What does marathon running do to an athletes cells
On the other hand, exercise necessarily increases a persons rate of metabolism, as food is processed to provide energy expended through exercise. An inevitable side-effect of metabolism is the production of reactive oxygen species (ROS) and "free radicals" that can damage DNA and other cellular constituents. This cellular damage can lead to either cancer or accelerated aging due to cell senescence and cell death.
The paradox, then, is that the health benefits of exercise do not seem to be canceled out by the side-effects of higher rates of metabolism. Its an important issue not just for humans who are trying to stay healthy, but even more important in animals like birds that may need to expend energy continuously over significant periods of time.
So whats going on here? Perhaps this research has some of the answer:
The effect of marathon on mRNA expression of anti-apoptotic and pro-apoptotic proteins and sirtuins family in male recreational long-distance runners
Background
A large body of evidence shows that a single bout of strenuous exercise induces oxidative stress in circulating human lymphocytes leading to lipid peroxidation, DNA damage, mitochondrial perturbations, and protein oxidation.
In our research, we investigated the effect of physical load on the extent of apoptosis in primary cells derived from blood samples of sixteen healthy amateur runners after marathon (a.m.).
Results
Blood samples were collected from ten healthy amateur runners peripheral blood mononuclear cells (PBMCs) were isolated from whole blood and bcl-2, bax, heat shock protein (HSP)70, Cu-Zn superoxide dismutase (SOD), Mn-SOD, inducible nitric oxide synthase (i-NOS), SIRT1, SIRT3 and SIRT4 (Sirtuins) RNA levels were determined by Northern Blot analysis. Strenuous physical load significantly increased HSP70, HSP32, Mn-SOD, Cu-Zn SOD, iNOS, GADD45, bcl-2, forkhead box O (FOXO3A) and SIRT1 expression after the marathon, while decreasing bax, SIRT3 and SIRT4 expression (P < 0.0001).
Conclusion
These data suggest that the physiological load imposed in amateur runners during marathon attenuates the extent of apoptosis and may interfere with sirtuin expression.
There are two main findings here, related to apoptosis and sirtuin expression. Lets take them in order.
Apoptosis is a form of programmed cell death that has several purposes. The invocation of a cells apopotosis program isnt necessarily an indication that something is wrong. For example, it occurs normally during embryonic development. Early in the development process embryos of all tetrapods have tissues between what will become the fingers and toes of their hands and feet. But since animals that have left an aquatic environment are usually better off without this extra tissue, evolution has led to signals at a certain stage of embryonic development that cause apoptosis in the cells of the relevant tissue. This is an example of whats known as the "extrinsic" apoptotic pathway.
But for our present purposes theres a second pathway – the "intrinsic" pathway – which is used whenever a cell either detects internal damage (usually to its DNA) or some stressful condition, such as an excessive level of reactive oxygen species. A ROS is a chemically-reactive molecule containing oxygen, including what are sometimes called "free radicals".
This condition of excess ROS is called oxidative stress. It can occur for various reasons, including exposure to high levels of heat or ultraviolet radiation – or abnormally rapid cell metabolism due to vigorous exercise. Cells recognize the condition of oxidative stress indirectly though signaling involving various other molecules that are produced in response to particular ROS molecules. Among such indicators are proteins called heat shock proteins. Two members of this family that were measured in the research under discussion were HSP70 and HSP32.
Signals of oxidative stress trigger the second, "intrinsic" apoptotic pathway, which involves a cells energy-producing organelles, the mitochondria. The main players in the intrinsic pathway are proteins called, generically, "caspases" – short for "cysteine-rich aspartate proteases". Caspases are enzymes that cleave proteins at aspartate units. (Cysteine and aspartate are two of the 21 amino acids that normally make up proteins.)
Caspases are fairly active enzymes, so they dont ordinarily occur at significant concentrations within cells. Instead, they are produced when needed from other protein enzymes called procaspases. One of these, procaspase-9 is found normally within mitochondria, along with another protein, cytochrome c. Most of the time these proteins are confined within the mitochondria. However, under certain conditions some channels in a mitochondrions membrane can open and allow the release of procaspase-9 and cytochrome c. Once these proteins enter the cytosol (cell fluid) outside a mitochondrion, they can team up with another protein (Apaf-1: "apoptotic protease activating factor 1") to convert the procaspase-9 into the caspase known as caspase-9. The latter is an active enzyme that leads to the production of other caspases, with cell apoptosis as the eventual result.
Since a cell does not want to have apoptosis going on normally, the process must be tightly regulated. This is done (partly) by another pair of proteins, Bcl-2 and Bax. These two proteins have structural similarities and are considered to be in the same family, the Bcl-2 family. They are always present in the cytosol, and the relative concentration between Bcl-2 and Bax is what controls whether mitochondrial membrane channels will allow release of procaspase-9 and cytochrome c. If the ratio favors Bcl-2, the channels are essentially closed – the normal case – but if the ratio favors Bax, the channels open... and apoptosis may follow.
The present research measured the levels of certain proteins in 10 individuals before and after a marathon run. (The measurement was done indirectly by measuring levels of mRNA transcripts of the associated genes.) A key finding was that the ratio of Bcl-2 to Bax shifted in favor of Bcl-2 from the before to the after measurement. In other words, there was an anti-apoptotic effect, which countered the pro-apoptotic effects of ROS molecules produced by vigorous exercise. Although ROS levels were not measured (since there was no corresponding mRNA), levels of superoxide dismutase (SOD) antioxidants (Mn-SOD and Cu-Zn-SOD) increased after the marathons, reflecting ROS production.
Analysis of the results indicates that apoptosis actually was inhibited, though less in some experimental subjects than others. An increase in levels of procaspase-9 was not observed. Further, in 7 of the 10 experimental subjects, there was little evidence of DNA fragmentation (a consequence of apoptosis). In the other 3 subjects, there was some evidence of DNA fragmentation, but also smaller changes in the Bcl-2 to Bax ratios.
Most interestingly, there was a significant positive correlation in after marathon measurements between levels of Bcl-2 and both HSP70 and HSP32. This suggests that the expected increases of HSP70 and HSP32 may play some part in increased Bcl-2 levels. There was also a positive correlation post-marathon between HSP70 and Mn-SOD levels.
These findings, especially given the small sample size, certainly arent conclusive. But, as the paper says, "Here, we have found a significant relationship between HSP70 and bcl-2 RNA ... following marathon, but the underlying cellular and molecular mechanisms involved in this [sic] exercise induced adaptations in apoptosis and HSP70 are unknown and require further investigation."
Expression of the sirtuins SIRT1, SIRT3, and SIRT4 pre- and post-marathon were also measured. (Weve discussed the sirtuins on a number of occasions.) Theres an extensive history of research on SIRT1, concerning its connections with such things as cellular metabolism, cell survival under stress, and antioxidant activity. Research on other sirtuins like SIRT3 and SIRT4 is less extensive. However, members of this family have various things in common. All are enzymes. SIRT1 and SIRT3 are histone deacetylases (HDACs), so have epigenetic roles in affecting gene expression. SIRT3 and SIRT4 occur in mitochondria.
Although its possible to make various speculations about how sirtuins could be involved with apoptosis and metabolic consequences of exercise, not all that much is known about specific molecular mechanisms. Nevertheless, its interesting that the present research does show an effect of strenuous exercise on SIRT1, SIRT3, and SIRT4 expression. The paper notes that "the RNA contents of SIRT1 increased substantially in the group after marathon.... On the other hand, the RNA contents of SIRT3 and SIRT4 decreased in the group after marathon."
Further research into these connections could be very interesting.
Marfe, G., Tafani, M., Pucci, B., Di Stefano, C., Indelicato, M., Andreoli, A., Russo, M., Sinibaldi-Salimei, P., & Manzi, V. (2010). The effect of marathon on mRNA expression of anti-apoptotic and pro-apoptotic proteins and sirtuins family in male recreational long-distance runners BMC Physiology, 10 (1) DOI: 10.1186/1472-6793-10-7 |
Further reading:
Running a marathon halts cellular suicide (5/11/10)
Articles related to sirtuins:
Sirtuin proteins (11/16/07)
The discovery of sirtuins, part 1 (11/17/07)
The discovery of sirtuins, part 2 (11/20/07)
Sirtuin news (1/21/08)
SIRT1 and cancer (10/26/08)
Iraqi Oil What is hidden inside the Oil Contracts from the 1st and 2nd Bid Rounds
Over eleven months have passed since the signing of the oil contracts between the Federal Ministry of Oil in Baghdad and the International oil companies (IOCs) resulting from the first and second bid rounds. However, to this date none of these contracts have been publicly released or published in any foreign language. Amazingly, all the contracts are written in English and none of them have even been translated into Arabic by the oil ministry in Baghdad, for the Iraqi people or even their representatives in the Federal parliament in Baghdad to look at and to see how their future is going to be shaped.
I have now obtained access to some of the contracts. My sources have specified that I cannot publish them in full, but I can discuss several aspects of them, which I shall do here.
My analyses will not cover the consequences of these contracts for the future of the Iraqi oil and gas industries or the future relations between Iraq and OPEC and its effect on international oil prices, as I already have covered these important topics in my previous articles [Iraqi Oil: The influence of the 1st Bid Round on the Future of Iraqs National Oil and Gas industries and [Iraqi Oil: Are the 1st and 2nd Bid Rounds Part of A Wise Resource Development Strategy Or Could They Turn Out To Be Steps in the Wilderness? ]
... Conclusions
1. Articles 12 and 37 explain the reasons for the secrecy surrounding the 1st and 2nd bid round oil contracts and the lack of real transparency by the Federal Ministry in Baghdad. Not only have the contracts not been made public, but they have not even been translated into Arabic, which should make every Iraqi suspicious of the motives behind all the secrecy covering the contracts to this date.
2. Article 12 shows that the margin of profits which were agreed on officially with the IOCs contractors does not represent the only profit that the IOCs will receive from the Iraqi Ministry of Oil, as the Ministry of Oil will compensate the contractors for the quantity of oil that they do not produce, which will in itself represent a penalty on the Iraqi people, whilst the IOC will receive additional profits for doing nothing.
3. Article 37 is a very significant article in terms of setting up the economic future of the Iraqi people and their future sovereignty. Therefore it is not wise to leave these vital decisions in the hands of bureaucrats in the Ministry of Oil or, for that matter, in the hands of a very weak government, without allowing the Iraqi people to have their say on their future by ensuring that such laws can only turn into lawful contracts if they are at least passed by an elected parliament, as required by existing Law number 97 dated 1967 which is still in force, or by a public referendum.
4. There are some analysts who believe that the US oil companies lost out from the awarded contracts, since only two of them, Exxon Mobil and Occidental have been awarded contracts. In my judgment this was not the case, as today what we call the International Oil Companies are really no longer national oil companies operating in the international market, as was the case up to the 1970s. In todays market, what we call IOCs are in fact multinational oil companies (MOC), owned by the multinational financial institutions (mostly US), with share holders from around the globe, and not by one nations share holders. It is more likely today that the external size of operations and profits of theses companies comes from projects from all over the globe rather than from one nation, as shown by the cases of BP, Shell and most others including CNPC.
5. The contracts awarded in the 1st and 2nd bid rounds confirm that the US occupation of Iraq which started in 2003 did achieve some of its targets. In particular the occupation succeeded in ensuring that the future control of Iraqi oil stayed in the hands of the multinational oil companies and not in the hands of the Iraqi people and their legislative body.
Sunday, August 31, 2014
What Are Two Alternative Energy Sources
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