12.05.2014

Journal of environmental science

A study from China found that men living in polluted cities had lower fertility than their country cousins. That is the finding of a recent study published in the journal Environmental Pollution, which analysed semen samples from more than 1,300 men in China.
The study, led by researchers from China's Third Military University, compared the quality of sperm from men living in Chongqing City, an industrial city in China's south-west, to that of men from surrounding rural areas. The researchers found that city-dwelling men had higher levels of abnormally shaped sperm than their rural counterparts.
The scientists attributed the poorer quality of sperm in urban areas to high levels of air pollution, with concentrations of particulate matter, sulphur dioxide and nitrous dioxide in Chongqing City exceeding World Health Organisation guidelines. Air-borne particulate matter may also contain many other industrial pollutants, such as lead, cadmium and mercury, which can also be toxic to sperm. Hammoud said it can take up to three months from being exposed to pollution until effects on the sperm are seen.
While the Chongqing study is not the first to make a link between declining sperm quality and air pollution, Hammoud cautions that this does not necessarily mean it is the smoking gun. There has been considerable debate in the scientific community concerning reports of a global decline in sperm quality and male fertility. In Australia, one in six couples has trouble conceiving naturally and half of the cases are related to male infertility.


The technique is used to determine the age of organic artefacts in fields like archaeology, geology, and ecology.
Using data from WRI’s CAIT Climate Data Explorer, this dynamic graph below allows you to explore emissions data for 2012. Three runners attempt to run 160km through remote wilderness to raise money for climate change. This site is where you will find ABC stories, interviews and videos on the subject of Environment. The all-male choir from South Africa performed their lively, social-justice inspired music at WOMADelaide. The researchers in this study have attributed a wide range of dietary components and influences to epigenetic modifications which are heritable and potentially reversible changes in gene expression that do not require changes to the actual DNA sequence. Additional studies are required to explore the effective doses and concentrations of bioactive food components in cancer prevention or treatment.
As well as identifying the epigentic changes caused by nutritional intervention the study also highlights the potential that changes in gene expression could be caused by the impact of genetically modified food and the interaction of the modified gene in the human body. New study shows that risk of aggressive prostate cancer is reduced with addition of low fat fish oil. Success is the result of good judgement, which is the result of experience, experience is often the result of bad judgement.


For Jo Immig from the National Toxics Network, the issue extends beyond impacts on male fertility. As you browse through the site, the links you follow will take you to stories as they appeared in their original context, whether from ABC News, a TV program or a radio interview. A number of studies have started to demonstrate the effect of nutritional effects on gene expression and how it impacts on certain diseases, including cancer.
The interaction and identification of compounds and metabolites is a specific and necessary component in identifying the risk factor by which epigenetic changes occur.
More research is also necessary to determine proper responses for healthy individuals attempting to prevent cancer, as well as individuals with different stages of cancer. In a recent article in the journal of Nutrition and Cancer researchers examined the effects of diet on gene expression through epigenetic mechanisms.




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