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The curve for E. coli is given in the figure, with the most effective UV light having a wavelength of 265 nm. This applies to most bacteria and does not change significantly for other microbes. Dosages for a 90% kill rate of most bacteria and viruses range between 2,000 and 8,000 μJ/cm 2.
In 2012, the vast majority of robotic lawn mowers tackled the task utilizing a "random" mowing system. Basically the machine bounced around on the lawn until it hit the boundary wire limiting the working area, then changed heading until it hit the wire again. [5] Depending on the lawn size, this meant machines would be in continuous operation.
To achieve a healthy lawn, she recommends tricks like mowing at 3 to 3 1/2 inches in height to prevent grass from stressing under extreme heat as well as aerating your lawn to improve drainage and ...
Killing your entire lawn gets rid of everything—grassy and broadleaf weeds, off-type lawn grasses, and the few strands of good grass you have left. Unlike the five percent household vinegar used ...
The smell of freshly cut grass is evident immediately after mechanical damage, such as that done by mowing the lawn. The main compound responsible for the smell of freshly cut grass is cis-3-hexenal. It has a low odour detection threshold that humans can perceive at concentrations as low as 0.25 parts per billion.
Microwave signals are normally limited to the line of sight, so long-distance transmission using these signals requires a series of repeaters forming a microwave relay network. It is possible to use microwave signals in over-the-horizon communications using tropospheric scatter , but such systems are expensive and generally used only in ...
Bacterial lawn is a term used by microbiologists to describe the appearance of bacterial colonies when all the individual colonies on a Petri dish or agar plate merge to form a field or mat of bacteria.
The city said the spill killed 25 to 50 small fish and produced “high levels” of E.coli bacteria. Gentry Estates pond contaminated with sewage by fiber-optic installation Skip to main content