(a.) Not perfect; not complete in all its parts; wanting a part; deective; deficient.
(a.) Wanting in some elementary organ that is essential to successful or normal activity.
(a.) Not fulfilling its design; not realizing an ideal; not conformed to a standard or rule; not satisfying the taste or conscience; esthetically or morally defective.
(n.) The imperfect tense; or the form of a verb denoting the imperfect tense.
(v. t.) To make imperfect.
Example Sentences:
(1) The spin-spin relaxation time T2 may be estimated using multiecho pulse sequences, but the accuracy of the estimate is dependent on the fidelity of the spin-echo amplitudes, which may be severely compromised by rf pulse and static field imperfections.
(2) Politicians must make decisions every day with imperfect knowledge, knowing that many of those choices may turn out to be ineffective.
(3) The quality of reduction is often imperfect and the techniques of surgical repair are very difficult and time consuming.
(4) An important source of failure in markets and justification for government intervention in the health sector of LDCs is imperfect information.
(5) It is suggested that absence or imperfect function of this reductase enzyme is the primary lesion in this disease.
(6) Dual aspects, crystallite size and lattice imperfection related to the crystallinity were analyzed by the process of Variance and Fourier analysis based on the X-ray diffraction line profiles.
(7) The membranous portion of the interventricular septum was thickened, and the aortic valve was thickened and had imperfect coaptation.
(8) Results reveal that while dental markets are imperfectly competitive, it is unclear whether prices exceed competitive levels.
(9) What we are witnessing is the collision of two imperfect storms: the Conservative party’s turmoil over the future of taxation, and the transformation of the economy.
(10) The mechanisms underlying the initial interaction between killer cell and target and the subsequent lytic event are imperfectly understood.
(11) It is shown that imperfect correlations between proficiency and preference measures, and J-shaped distributions of preference, can be predicted by such a model.
(12) We conclude that the liver may be viewed as an imperfectly mixed compartment with regard to the availability of the metabolite which is generated from a precursor.
(13) The theory of imperfect recanalization, the theory of vascular insufficiency, and studies which have been performed to validate each of these theories were reviewed.
(14) The results of this investigation indicate that the posttransplanted deterioration of metabolic levels were possibly caused by the imperfect oxygenation due to cellular edema after blood reflow.
(15) It would be easy to efficiently cut him down with the word “rapist”, particularly when I will not face any reprimands for my own imperfect behaviour during the relationship.
(16) "We had been doing exactly as any responsible, professional journalist would – recording and trying to make sense of the unfolding events with all the accuracy, fairness and balance that our imperfect trade demands."
(17) To stand virtuously in the grandstand looking down upon a world whose best efforts in inevitably imperfect times can never match your own exalted standards is a definition of irrelevance, not virtue.
(18) Les Misérables is a game with destiny: it dramatises the gap between the imperfections of human judgments, and the perfect patterns of the infinite.
(19) Association of radiological changes with imperfection of lungs' ventilating reserve of restrictive type was found in one man who was removed from the work in exposure to beryllium, as a person with an increased risk of falling ill.
(20) Reviewing it for the Guardian , Gillian Slovo described it as "a pained examination of the difficulties posed by a freedom that was won by imperfect human beings."
Polyphyletic
Definition:
(a.) Pertaining to, or characterized by, descent from more than one root form, or from many different root forms; polygenetic; -- opposed to monophyletic.
Example Sentences:
(1) Both perforating-type infarcts and cortical-type infarcts were found, suggesting that infarct-related foci of depressive states were polyphyletic.
(2) This clearly indicated a close phylogenetic relationship between the plastids of Rhodophyta and Chromophyta which seem to have evolved independently from the chloroplasts (polyphyletic origin).
(3) Gene genealogy in two partially isolated populations which diverged at a given time t in the past and have since been exchanging individuals at a constant rate m is studied based upon an analytic method for large t and a simulation method for any t. Particular attention is paid to the conditions under which neutral genes sampled from populations are mono-, para-, and polyphyletic in terms of coalescence (divergence) times of genes.
(4) These findings are in agreement with the hypothesis of a polyphyletic origin of plastids.
(5) Wild sheep with 2n=54 may have evolved monophyletically from an ancestral 2n=58-56-54 population or polyphyletically by a series of independent, nonrandom fusions.
(6) When only plastidic features are considered, it is difficult to distinguish between monophyletic and polyphyletic xenogenous origins of plastids.
(7) The association is monophyletic in cockroaches but polyphyletic in many groups, including the sucking lice, beetles and scale insects.
(8) Although chloroplasts probably originated only once, eukaryotic algae are polyphyletic because chloroplasts have been secondarily transferred to new lineages by the permanent incorporation of a photosynthetic eukaryotic algal cell into a phagotrophic protozoan host.
(9) Among the Iguania, the Iguanidea are polyphyletics, the north-american forms breaking up from the other very early.
(10) This great diversity in the chromosomal genome raises the possibility that R. leguminosarum biovar phaseoli is a polyphyletic assemblage of strains.
(11) The developed systemic approach using the analysis of the MGIT system and integral differences between viruses by the totality of their properties helped to form models of virus evolution taking into account, in particular, their mono- or polyphyletic origin, more definite knowledge on pravirus(es) MGIT, etc.
(12) The data support the idea of a polyphyletic origin of the phycomycetes and suggest that anascosporogenous yeasts tested are related to the heterobasidiomycetes rather than to the Endomycetales.
(13) However, it was expected that in Switzerland, inbreeding from isonymy would be an overestimate due to patrilocal residence and polyphyletic names.
(14) Our results support hypotheses that most taxonomic concepts of the order Nymphaeales reflect polyphyletic groups and that the unusual genus Ceratophyllum represents descendants of some of the earliest angiosperms.
(15) We also show that the prochlorophytes are a highly diverged polyphyletic group.
(16) Taxonomic relations between methylotrophic and non-methylotrophic bacteria are discussed, and the polyphyletic nature of methylotrophy as a taxonomic feature is highlighted.
(17) Sequence comparisons support the idea of a polyphyletic origin of the red algal and the higher-plant chloroplasts.
(18) Naegleria gruberi is most likely a polyphyletic grouping and care should be taken when using one strain as a reference point for this species.
(19) These data provide strong evidence for a polyphyletic origin of chloroplasts and rhodoplasts.
(20) Evidently, then, heterogamety and sex-chromosome heteromorphism are polyphyletic, although certain sex-determining genes may be held in common among the diverse taxonomic groups.