One passes positively charged ions and the other passes negatively charged ones.
From the economist.com
No one knows better than teachers about this has negatively affected classrooms.
From the ocregister.com
If you can answer my questions negatively, then you have nothing to worry about.
From the guardian.co.uk
Even patients with Alzheimer's disease react negatively to patronizing language.
From the dailyherald.com
Marriage gain and loss affects this stock positively and negatively, Waite says.
From the newsweek.com
Such interactions can positively or negatively regulate dendritic cell activity.
From the nature.com
If a study has strict criteria for success, the results are negatively affected.
From the nature.com
Several developments have impacted negatively on the government in recent weeks.
From the economist.com
Bradshaw reviewed Fair Game more negatively than any other critic I came across.
From the guardian.co.uk
More examples
In a harmful manner; "he was negatively affected"
(negative) characterized by or displaying negation or denial or opposition or resistance; having no positive features; "a negative outlook on life"; "a colorless negative personality"; "a negative evaluation"; "a negative reaction to an advertising campaign"
(negative) veto: vote against; refuse to endorse; refuse to assent; "The President vetoed the bill"
(negative) expressing or consisting of a negation or refusal or denial
(negative) a piece of photographic film showing an image with light and shade or colors reversed
(negative) not indicating the presence of microorganisms or disease or a specific condition; "the HIV test was negative"
(Negative (photography)) In photography, a negative may refer to three different things, although they are all related.
(Negative (policy debate)) In policy debate, the Negative (NEG) is the team which negates the resolution.
(Negative (pop/rock band)) Negative is a successful Serbian pop/rock band.