(n.) A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; -- used for transmitting and modifying force and motion. Specif., a bar of metal, wood, or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mechanical powers, and is of three kinds, according as either the fulcrum F, the weight W, or the power P, respectively, is situated between the other two, as in the figures.
(n.) A bar, as a capstan bar, applied to a rotatory piece to turn it.
(n.) An arm on a rock shaft, to give motion to the shaft or to obtain motion from it.
Example Sentences:
(1) In this experiment animals were trained to lever press in two distinctive contexts.
(2) Orientation and lever responding were not functionally related.
(3) In older stages, the cervical joints rotate according to geometric and lever arm principles.
(4) In EastEnders , the mystery surrounding the identity of Kat's secret squeeze continues amid the grinding of narrative levers and the death rattle of overflogged script-horses.
(5) Cats were trained to press a lever for 0.5--1.0 ml of milk reward both in the presence and absence of ambient light.
(6) Setting out how Britain would have a lever over the rest of the EU to demand repatriation of UK competences, Cameron said: "What's happening in Europe right now is massive change being driven by the existence of the euro.
(7) When lever pressing was established, the 2-kHz signal was presented through a speaker adjacent to the response lever according to a different set of variable intertrial intervals.
(8) Officials said the changes to the planning rules will mean it is possible to lever in billions of private sector development in low-cost housing.
(9) Rats were allowed to bar press on either of two levers (left and right).
(10) Knee flexion is synchronized with ankle dorsiflexion by a synchronizer rod and lever.
(11) In order to study the interactions between serotonergic mechanism and electrical stimulation of the mesencephalic central gray substance, rats were trained to lever-press for terminating aversive electric stimuli applied at the Periaqueductal gray and adjoining tectum of the mesencephalon.
(12) Rats were trained to press a lever to obtain a brief burst of pulses to the lateral hypothalamus.
(13) But its original meaning is the practice of using the levers of the state and of government to get difficult things done that otherwise wouldn't happen.
(14) Intact rats and rats bearing lesions of the suprachiasmatic nuclei (SCNX rats) were trained to obtain food by pressing either of two levers located on opposite sides of a cylindrical cage.
(15) We found that attenuation of lever-pressing and water intake by raclopride were not more separated in dose than after, for example, haloperidol.
(16) Young rats weaned at 16 days were taught to press a lever by shaping at 18 days and trained for 11 days (from 20 to 30 days of age) on a fixed-interval 60-sec schedule, at a rate of 5 half-hour sessions per day.
(17) In contrast, the selective norepinephrine uptake inhibitors, desipramine and talsupram, and the selective serotonin uptake inhibitor, citalopram, occasioned averages of only 13 to 19% drug-lever responding.
(18) When reinforcement was not available, each lever response produced a 0.5-sec green light on the key.
(19) Rats implanted with placebo pellets and given access to morphine reestablished lever pressing, while those given access to isotonic saline extinguished their lever pressing.
(20) Levels of acetylcholine were significantly elevated in the telencephalon and diencephalon + mesencephalon of rats killed by near-freezing during conditioned suppression of food-reinforced lever pressing, whereas levels of serotonin, dopamine, and norepinephrine were not altered.
Never
Definition:
(adv.) Not ever; not at any time; at no time, whether past, present, or future.
(adv.) In no degree; not in the least; not.
Example Sentences:
(1) We will never give up our hope for peace,” added Netanyahu.
(2) Both condemn the treatment of Ibrahim, whose supposed offence appears to have shifted over time, from fabricating a defamatory story to entering a home without permission to misleading an interviewee for an article that was never published.
(3) The peak molecular weight never reached that of a complete 2:1 complex.
(4) The latest story will show Bridget more "grown up" but she is "never going to change really".
(5) Critics say he is unelectable as prime minister and will never be able to implement his plans, but he has nonetheless pulled attention back to an issue that many thought had gone away for good.
(6) The curious thing, it seems to me, is that she was never criticised for it.
(7) … or a theatre and concert hall There are a total of 16 ghost stations on the Paris metro; stops that were closed or never opened.
(8) I’ve never really had that work versus life thing; it’s all part of the same canvas.
(9) My father has never met him but has a different view.
(10) Only 47 of the patients had received salicylates as the first drug and 18 had never had them at all.
(11) Never become so enamored of your own smarts that you stop signing up for life’s hard classes.
(12) In order to maintain its activity, the enzyme was always stored in 1.0-ml aliquots at temperatures below -20 degrees C and each aliquot when thawed was used immediately; any left over enzyme was never reused.
(13) Single injections never produced more than one coupled pair in P20 or older rats.
(14) I never had any doubt that the vast majority of people engaged in "business" are not the exploiters but the exploited.
(15) One important consequence of the conservative mode of replication is that cellular enzymes never gain access to the reovirus genome but only to its ssRNA precursors.
(16) I never accuse a student of plagiarizing unless I have proof, almost always in the form of sources easily found by Googling a few choice phrases.
(17) Journalists should never be a propaganda arm of any government – not in peace and never in war.
(18) They were never a band, as they were often called, they were artist-activists.
(19) Furthermore, non-coordinate expression of DR and DQW1 was present in 8 out of 40 carcinomas, with the proportion of DQW1 positive epithelium always being less than that of DR. Carcinomas exhibiting non-coordinate expression were never well differentiated; there was no relationship with the extent of the inflammatory infiltrate.
(20) The Ibiza Rocks hotel is aimed at a young clientele who'd never make it into the VIP section of Pacha.