Showing posts with label
journal of environmental toxicology.
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Showing posts with label
journal of environmental toxicology.
Show all posts
Ethiopia is the largest livestock producer in Africa, with 70.79 million heads of cattle, 28.48 million sheep, 25.91 million goats, 24.56 million donkeys, 11.39 million horses, 8.08 million mules, 8.39 million camels, and 42.51 million poultry. The largest livestock were found in Oromiya, Amhara and South Nations and Nationalities of People regions. However, the production of livestock is low due to technical constraints to livestock development like absence of approved livestock policy, lack of rural infrastructure and services, inadequate specialists and skilled staff, feed constraints, prevalent animal diseases, grazing land shortage, lack of credit, poor management, low genetic quality of most indigenous breed, recurrent drought, and lack of technical skill on feeding.
The climate
is changing at a rate never seen before. Aquatic organisms are endangered
throughout the world for various reasons, including global climate change.
Changes in precipitation and temperature will dramatically affect the survival
of many species. Plants play a key role in moderating climate change becausethey take up carbon dioxide (CO2). If plants are lost, the carbon (as CO2) will
continue accumulating in our atmosphere and causes air temperature to rise,
leading to ocean acidification. With climate changes, aquatic environments face
increases in oceans salinity and sea level rise due to melting of the ice in
the poles. These combined factors result in drastic world destruction.

Organisms need specific conditions in order to survive. Scientists predict that
these conditions will be altered when the global climate changes. A change insalinity and temperature could lead to death, migration, or poor health of the
living organisms. The loss of aquatic environments will be a major disasterthat will take place because of previous changes
The
importance of selenium (Se) in human is well established, and its deficiency
has caused serious diseases such as cancer and heart disease. Around 25
selenoproteins contain selenium as important element, which are commonly known
as selenocysteine. In addition, research on selenium has gained significant
attention due to its important role in antioxidant selenoproteins for
protection against oxidative stress initiated by excess reactive nitrogen
species (RNS) and reactive oxygen species (ROS). In selenocysteins, selenium
metal functions as redox centre in various processes, which includes thereduction of nucleotides in DNA synthesis through selenoenzyme and thioredoxinreductase; and production of active thyroid hormone pre-cursor from
selenium-dependent iodothyronine deiodinases.

Furthermore, the bioavailability
of selenium plays a crucial role in its anticancer and antioxidant activities.
It is reported that the particles with crystallite size of nanometre range
exhibit better bioavailability and low toxicity as compared to particles withlarge crystallite size. After considering the vast importance of selenium as
nutrient in human body, authors wish to investigate an economically safe
approach that could be beneficial to modify the physical and thermal properties
of selenium powder.