direct vision |
Vision stimulated by an object imaged on the fovea centralis. Synonym: direct vision. (05 Mar 2000) |
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direct vision spectroscope |
<instrument> A spectroscope consisting of a single tube containing a series of prisms; one end of the tube is placed in as close contact as possible with the substance to be examined while the observer places his eye at the opposite end; it can be used to make a spectroscopic examination of the blood in vivo, as in the ear lobe or web of the thumb. (05 Mar 2000) |
direct zoonosis |
A zoonosis transmitted between animal and humans from an infected to a susceptible host by contact, by airborne droplets or droplet nuclei, or by some vehicle of transmission; the agent requires a single vertebrate host for completion of its life cycle and does not develop or show significant change during transmission; may include anthropozoonoses (rabies), zooanthroponoses (amoebiasis), and amphixenoses (certain streptococcoses). (05 Mar 2000) |
directed molecular evolution |
Techniques used to produce molecules exhibiting properties that conform to the demands of the experimenter. (12 Dec 1998) |
directer |
One who directs; a director. <geometry> Directer plane, the plane to which all right-lined elements in a warped surface are parallel. Source: Websters Dictionary (01 Mar 1998) |
directional atherectomy |
Removal of coronary atherometer with instrumented catheter. (05 Mar 2000) |
directional cloning |
DNA insert and vector molecules are digested with two different restriction enzymes to create noncomplementary sticky ends at either endof each restriction fragment. This allows the insert to be ligated tothe vector in a specific orientation and prevents the vector fromrecircularising. (09 Oct 1997) |
directive psychotherapy |
Psychotherapy utilizing the authority of the therapist to direct the course of the patient's therapy, as contrasted with nondirective psychotherapy. (05 Mar 2000) |
directives, advance medical |
Advance directives preserve the person's right to accept or reject a course of medical treatment even after that person becomes mentally or physically incapacitated to the point of being unable to communicate those wishes. There ared two basic types of advance directives: (1) a living will, in which the person outlines specific treatment guidelines that are to be followed by health care providers; (2) a health care proxy (also called a power of attorney for health-care decision-making) in which the person designates a trusted individual to make medical decisions in the event that he or she becomes too incapacitated to make such decisions. Advance directive requirements vary greatly from one jurisdiction to another and should therefore be drawn up in consultation with an attorney who is familiar with the laws of the particular jurisdiction. (This entry is based upon material from the National MS Society). (12 Dec 1998) |
directly |
1. In a direct manner; in a straight line or course. "To run directly on." "Indirectly and directly too Thou hast contrived against the very life Of the defendant." (Shak) 2. In a straightforward way; without anything intervening; not by secondary, but by direct, means. 3. Without circumlocution or ambiguity; absolutely; in express terms. "No man hath hitherto been so impious as plainly and directly to condemn prayer." (Hooker) 4. Exactly; just. "Stand you directly in Antonius' way." (Shak) 5. Straightforwardly; honestly. "I have dealt most directly in thy affair." (Shak) 6. Manifestly; openly. "Desdemona is directly in love with him." (Shak) 7. Straightway; next in order; without delay; immediately. "Will she go now to bed?' Directly.'" 8. Immediately after; as soon as. "Directly he stopped, the coffin was removed." (Dickens) This use of the word is common in England, especially in colloquial speech, but it can hardly be regarded as a well-sanctioned or desirable use. <mathematics> Directly proportional, proportional in the order of the terms; increasing or decreasing together, and with a constant ratio; opposed to inversely proportional. Synonym: Immediately, forthwith, straightway, instantly, instantaneously, soon, promptly, openly, expressly. Directly, Immediately, Instantly, Instantaneously. Directly denotes, without any delay or diversion of attention; immediately implies, without any interposition of other occupation; instantly implies, without any intervention of time. Hence, "I will do it directly," means, "I will go straightway about it." "I will do it immediately," means, "I will do it as the very next thing." "I will do it instantly," allows not a particle of delay. Instantaneously, like instantly, marks an interval too small to be appreciable, but commonly relates to physical causes; as, the powder touched by fire instantaneously exploded. Source: Websters Dictionary (01 Mar 1998) |
director |
1. One who, or that which, directs; one who regulates, guides, or orders; a manager or superintendent. "In all affairs thou sole director." (Swift) 2. One of a body of persons appointed to manage the affairs of a company or corporation; as, the directors of a bank, insurance company, or railroad company. "What made directors cheat in South-Sea year?" (Pope) 3. <mechanics> A part of a machine or instrument which directs its motion or action. 4. <surgery> A slender grooved instrument upon which a knife is made to slide when it is wished to limit the extent of motion of the latter, or prevent its injuring the parts beneath. Origin: Cf. F. Directeur. Source: Websters Dictionary (01 Mar 1998) |
directories |
Lists of persons or organizations, systematically arranged, usually in alphabetic or classed order, giving address, affiliations, etc., for individuals, and giving address, officers, functions, and similar data for organizations. (ala glossary of library and information science, 1983) (12 Dec 1998) |
directory |
An alphabetical or classified list of names, organizations, subjects, etc., giving usually titles, addresses, affiliations, and other professional data. (12 Dec 1998) |
directress |
A woman who directs. Source: Websters Dictionary (01 Mar 1998) |
directrix |
1. A directress. 2. <geometry> A line along which a point in another line moves, or which in any way governs the motion of the point and determines the position of the curve generated by it; the line along which the generatrix moves in generating a surface. A straight line so situated with respect to a conic section that the distance of any point of the curve from it has a constant ratio to the distance of the same point from the focus. Source: Websters Dictionary (01 Mar 1998) |