| air lift fermenter | <apparatus> A fermenter in which circulation of the culture medium and aeration is achieved by injection of air into some lower part of the fermenter. Usually not suitable for animal cell production. Related to gas lift systems where an inert gas is used to achieve circulation in anaerobic conditions. This type of of fermenter is well suited for large-scale production of monoclonal antibodies. (13 Nov 1997) |
|---|---|
| leg lift | An exercise designed to strengthen the quadriceps muscles. The patient lies on their back and lifts one leg at a time with a slightly flexed knee joint. The application of light ankle weights can augment this exercise in those who have reached a desirable level of conditioning. (27 Sep 1997) |
| lift | 1. Act of lifting; also, that which is lifted. 2. The space or distance through which anything is lifted; as, a long lift. 3. Help; assistance, as by lifting; as, to give one a lift in a wagon. "The goat gives the fox a lift." (L'Estrange) 4. That by means of which a person or thing lifts or is lifted; as: A hoisting machine; an elevator; a dumb waiter. An exercising machine. 5. A rise; a degree of elevation; as, the lift of a lock in canals. 6. A lift gate. See Lift gate, below. 7. A rope leading from the masthead to the extremity of a yard below; used for raising or supporting the end of the yard. 8. <machinery> One of the steps of a cone pulley. 9. A layer of leather in the heel. 10. That portion of the vibration of a balance during which the impulse is given. Dead lift. See Dead. Lift bridge, a kind of drawbridge, the movable part of which is lifted, instead of being drawn aside. Lift gate, a gate that is opened by lifting. Lift hammer. See Tilt hammer. Lift lock, a canal lock. Lift pump, a lifting pump. Lift tenter, the cross wall at the head of the lock. The sky; the atmosphere; the firmament. Origin: AS.lyft air. See Loft. 1. To move in a direction opposite to that of gravitation; to raise; to elevate; to bring up from a lower place to a higher; to upheave; sometimes implying a continued support or holding in the higher place; said of material things; as, to lift the foot or the hand; to lift a chair or a burden. 2. To raise, elevate, exalt, improve, in rank, condition, estimation, character, etc.; often with up. "The Roman virtues lift up mortal man." (Addison) "Lest, being lifted up with pride." (I Tim. Iii. 6) 3. To bear; to support. 4. To collect, as moneys due; to raise. 5. [Perh. A different word, and akin to Goth. Hliftus thief, hlifan to steal, L. Clepere, Gr. Cf. Shoplifter] To steal; to carry off by theft (especially. Cattle); as, to lift a drove of cattle. In old writers, lift is sometimes used for lifted. "He ne'er lift up his hand but conquered." (Shak) To lift up, to raise or elevate; in the Scriptures, specifically, to elevate upon the cross. To lift up the eyes. To look up; to raise the eyes, as in prayer. To lift up the feet, to come speedily to one's relief. To lift up the hand. To take an oath. To pray. To engage in duty. To lift up the hand against, to rebel against; to assault; to attack; to injure; to oppress. To lift up one's head, to cause one to be exalted or to rejoice. . To lift up the heel against, to treat with insolence or unkindness. To lift up the voice, to cry aloud; to call out. Origin: Icel. Lypta, fr. Lopt air; akin to Sw.lyfta to lift, Dan. Lofte, G. Luften; prop, to raise into the air. See Loft, and cf. 1st Lift. Source: Websters Dictionary (01 Mar 1998) |
| adolescent round back | Osteochondrosis of the vertebral epiphyses in children. (12 Dec 1998) |
| back | 1. Being at the back or in the rear; distant; remote; as, the back door; back settlements. 2. Being in arrear; overdue; as, back rent. 3. Moving or operating backward; as, back action. Back charges, charges brought forward after an account has been made up. Back filling, the retrograde movement of a man or body of men, without changing front. Back stream, a current running against the main current of a stream; an eddy. To take the back track, to retrace one's steps; to retreat. 1. In human beings, the hinder part of the body, extending from the neck to the end of the spine; in other animals, that part of the body which corresponds most nearly to such part of a human being; as, the back of a horse, fish, or lobster. 2. An extended upper part, as of a mountain or ridge. "[The mountains] their broad bare backs upheave Into the clouds." (Milton) 3. The outward or upper part of a thing, as opposed to the inner or lower part; as, the back of the hand, the back of the foot, the back of a hand rail. "Methought Love pitying me, when he saw this, Gave me your hands, the backs and palms to kiss." (Donne) 4. The part opposed to the front; the hinder or rear part of a thing; as, the back of a book; the back of an army; the back of a chimney. 5. The part opposite to, or most remote from, that which fronts the speaker or actor; or the part out of sight, or not generally seen; as, the back of an island, of a hill, or of a village. 6. The part of a cutting tool on the opposite side from its edge; as, the back of a knife, or of a saw. 7. A support or resource in reserve. "This project Should have a back or second, that might hold, if this should blast in proof." (Shak) 8. The keel and keelson of a ship. 9. <chemical> The upper part of a lode, or the roof of a horizontal underground passage. 10. A garment for the back; hence, clothing. "A bak to walken inne by daylight." (Chaucer) Behind one's back, when one is absent; without one's knowledge; as, to ridicule a person behind his back. Full back, Half back, Quarter back, players stationed behind those in the front line. To be or lie on one's back, to be helpless. To put, or get, one's back up, to assume an attitude of obstinate resistance (from the action of a cat when attacked). To see the back of, to get rid of. To turn the back, to go away; to flee. To turn the back on one, to forsake or neglect him. Origin: As baec, bac; akin to Icel, Sw, & LG. Bak, Dan. Bag; cf. OHG. Bahho ham, Skr. Bhaj to turn, OSlav. Bg flight. Cf. Bacon. Source: Websters Dictionary (01 Mar 1998) |
| back-action plugger | An instrument for condensing gold foil or amalgam in areas that cannot be reached directly. (05 Mar 2000) |
| back aperture | <microscopy> The exit pupil of a microscope objective lens. The objective lens back aperture, which can be examined with a phase telescope or by inserting a Bertrand lens, displays the conoscopic interference figure and diffraction patterns. (05 Aug 1998) |
| back cross | <genetics> A crossing of a heterozygous organism and one of its homozygous parents. (09 Oct 1997) |
| back focal length | <microscopy> As measured on the principal axis, from the second lens vertex to the back focal point of the lens. It is not the equivalent of the focal length. (05 Aug 1998) |
| back focal plane | <microscopy> The plane, normal to the lens axis, situated at the back focus of a lens. (05 Aug 1998) |
| back injuries | General or unspecified injuries to the posterior part of the trunk. It includes injuries to the muscles of the back. (12 Dec 1998) |
| back-knee | Hyperextension of the knee, the lower extremity having a forward curvature. Synonym: back-knee. (05 Mar 2000) |
| back lens | <physics> In any compound lens (a lens system composed of more than one lens element), the last lens through which the light passes is called the back lens. It may be a single simple lens, a doublet, or triplet. See: front lens (05 Aug 1998) |
| back mutation | <molecular biology> A mutation that causes a mutant gene to revert to its original wild-type base sequence. Compare: forward mutation. (09 Oct 1997) |
| back of foot reflex | The foot being firmly supported on its inner side, a sharp tap on the dorsal tendons causes extension of the second to the fifth toes. Synonym: back of foot reflex, dorsum of foot reflex. (05 Mar 2000) |