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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.
A robotic lawn mower is an autonomous robot used to cut lawn grass. A typical robotic lawn mower (in particular earlier generation models) requires the user to set up a border wire around the lawn that defines the area to be mowed. The robot uses this wire to locate the boundary of the area to be trimmed and in some cases to locate a recharging ...
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 ...
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 ...
Microwave-specific effects tend not to be controversial and invoke "conventional" explanations (i.e. kinetic effects) for the observed effects. [19] Non-thermal microwave effects have been proposed in order to explain unusual observations in microwave chemistry. As the name suggests, the effects are supposed not to require the transfer of ...
A flail mower is a type of powered garden/agricultural equipment which is used to deal with heavier grass/scrub which a normal lawn mower could not cope with. Some smaller models are self-powered, but many are PTO driven implements, which can attach to the three-point hitches found on the rear of most tractors .
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.
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