Maximum and minimum
temperatures time series of Congo-Brazzaville are analyzed for trend and discontinuities over the period 1932 to 2010. Temperatures series show an irregular increase. A total of 8 synoptic stations show positive
trends in their annual mean maximum temperature series, and 7 of them are
significant, with higher trends for urban stations. Annual mean minimum
temperature showed 6 stations having positive trends. This increase is in relation with observations at regional scale.
However, the differences are observed between large towns (Brazzaville and
Pointe-Noire), and small or rural towns (Dolisie, Sibiti, Impfondo, Djambala).
Trends in diurnal temperature range (DTR) are large positive trends in maximum
temperature that are mainly observed in cities. The curve of DTR shows a
decreasing trend which indicates the increasing of minimum temperatures. The
effects of urbanization on temperature trends are investigated. Most stations
regarded as urban stations are still useful for trend analysis; being situated
on the suburban of the studied cities, they are therefore, not substantially
influenced by the urban heat island.
The response of cells to different types of electromagnetic fields can be induced by low-level (athermal) high frequency (HF)
electromagnetic field (EMF) exposure associated with mobile phone technologies. There are many examples of
biological effects involving the epigenome. EMF could trigger protein activation mediated by
ligands, such as Ca2+, that alter the conformation of binding
proteins, especially the NADPH plasmic membrane oxidase, so inducing increased
formation of reactive oxygen species (ROS) that may alter proteomic functions.
Classical antiapoptotic and procarcinogenic signaling
mechanisms that are commonly found activated in human malignancies and in
inflammation mainly involve the transcription factor NF-κB. The microenvironment that exists
during chronic inflammation can contribute to cancer progression. The data
support the proposition that long term HF-EMF exposure caused by improper use
of cell phones may potentially cause cancer.