It is widely believed that Earth's atmosphere has been rich in oxygen for about 2.5 billion years due to a relatively rapid increase in microorganisms capable of performing photosynthesis.

"The oxygen content in these ecosystems is an important indicator of ecological health," says Wettstein. The sensor material is based on a composite of carbon nanotubes and titanium dioxide (TiO 2 ).

A reviewer shares, "I've had many different oxygen meters and this is by far the best. It gives an almost immediate reading and gives a warning beep if you are below 90. With some of the other ...

The federal Department of Education already made it harder for students to repay college loans, but what happens to those loans if the department is severely downsized or dissolved altogether?

President Trump campaigned on dismantling the U.S. Department of Education, and CBS News has confirmed that he plans to sign an executive order to begin the process. The timing of such a move wasn ...

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Following the 5-month conditioning phase, iron was introduced to 5 designated “Fe-amended” columns via a second influent reservoir containing synthetic wastewater and 1 g L –1 of dissolved Fe-EDTA in ...

Smart meter FAQs How much energy am I wasting? Many do not realise how much it costs to leave appliances on standby, according to British Gas. Households waste up to £147 a year by leaving their ...

The study examined optically active and non-optically active parameters, including chlorophyll-a, Secchi disk depth, turbidity, dissolved oxygen, and temperature, and compared the Landsat-8 OLI with ...