(a.) Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless.
(n.) Something that has no force or meaning.
(n.) That which has no value; a cipher; zero.
(v. t.) To annul.
(n.) One of the beads in nulled work.
Example Sentences:
(1) Measurements of acetylcholine-induced single-channel conductance and null potentials at the amphibian motor end-plate in solutions containing Na, K, Li and Cs ions (Gage & Van Helden, 1979; J. Physiol.
(2) DR(+) cells, however, showed no change in percentage and a lesser drop in absolute numbers, suggesting an increase with advancing disease of DR(+), Ig(-) null cells, which may represent immature B cell precursors.
(3) In this report we describe an improvement upon the design by Stanton and Lightfoot for a simple photographic null method to determine the kVp of a diagnostic region x-ray source.
(4) At least two (Rh null and the McLeod type) are responsible for congenital hemolytic disorders.
(5) (2) Sequences of brightness steps of like polarity (either increments or decrements) elicit positive and negative motion-dependent response components when mimicking motion in the cell's preferred and null direction, respectively.
(6) The analysis also involved statistical tests of a modified null hypothesis, the generation of confidence intervals (CIs) and a meta-analysis.
(7) The null potential of both responses became more and less negative with a decrease and an increase, respectively, in the extracellular potassium concentration.
(8) The null mutation of algR was generated in a mucoid derivative of the standard genetic strain PAO responsive to different environmental factors.
(9) Endoneurial fluid pressure (EFP) was recorded by an active, servo-null pressure system after a glass micropipette was inserted into rat sciatic nerve undergoing wallerian degeneration.
(10) In thymo-deprived mice (nude mice and B mice) the percentage of null cells increases during the stage of regeneration, and B mice develop a large number of Ig +-bearing cells.
(11) Alkaline phosphatase activity was elevated in the lymphocytes from T-CLL, cord blood and tonsils and the blast cells from Null-ALL.
(12) Analysis of ldlA cells has identified three classes of mutant alleles at the ldlA locus: null alleles, alleles that code for normally processed receptors that cannot bind LDL, and alleles that code for abnormally processed receptors.
(13) Putative null sup-38 mutations cause maternal-effect lethality which is rescued by a wild-type copy of the locus in the zygote.
(14) Null cells of patients with hypoplastic anemia did not produce erythroid colonies under any culture conditions.
(15) Comparison of simulated versus actual inheritance data demonstrates that the so-called null structural alleles actually produce functional globins.--The genetic controls in Peromyscus may be analogous to those in primates.
(16) A null zone and associated sudden phase-reversal of RSA were observed in stratum lucidum of CA3.
(17) When the stimulus is placed at a position approximately 80 degrees dorsal to the eye axis, there is no response; this area is called the null region.
(18) Northern blot analysis showed that Adh-1 mRNA was synthesized at wild-type levels in immature seeds of the null mutant, but dropped to 25% in mature seeds.
(19) Two tumours were null cell adenomas with PIs less than 0.1 and 0.2%.
(20) Thus this methodology offers the potential to study naturally occurring ADH electromorphs and null alleles independent of enzymatic activity assays.
Phagocyte
Definition:
(n.) A leucocyte which plays a part in retrogressive processes by taking up (eating), in the form of fine granules, the parts to be removed.
Example Sentences:
(1) The hypothesis that proteins are critical targets in free radical mediated cytolysis was tested using U937 mononuclear phagocytes as targets and iron together with hydrogen peroxide to generate radicals.
(2) Tumour necrosis factor (TNF), a polypeptide produced by mononuclear phagocytes, has been implicated as an important mediator of inflammatory processes and of clinical manifestations in acute infectious diseases.
(3) A re-examination of the literature indicates that many phagocytes previously unidentified or considered to be microglial cells are probably beta astrocytes.
(4) Organ distribution of the 99mTc-S-colloid showed marked phagocytic activity of the liver in all age groups including the newborn period.
(5) Mononuclear phagocytic cells from patients with either principal form of leprosy functioned similarly to normal monocytes in phagocytosis while their fungicidal activity for C. pseudotropicalis was statistically significantly altered and was more evident in the lepromatous than in the tuberculoid type.
(6) Furthermore, the expression of the 'mature' markers was found to be correlated with the phagocytic capacity of the cells.
(7) The organisms were predominantly associated with host deposits of erythrocytes, phagocytes, platelets, and fibrinous-appearing material, which collectively appeared on the valve surface in response to trauma.
(8) Changes in protein phosphorylation induced by phagocytic challenge were identified in cultured rat retinal pigment epithelium (RPE) following exposure to isolated rat rod outer segments (ROS) or to polystyrene latex microspheres (PSL).
(9) The percentages of bacteria phagocytized and intracellularly killed by macrophages rose to 60-80% and 85-95% respectively when the doubling time was longer, showing that S. mutans is particularly sensitive to nonspecific immune defence mechanisms when cultured under conditions similar to those of its natural ecosystem.
(10) However, when these latter functions were assessed in the presence of a phagocytic stimulus, clofazimine moderately increased both lysozyme release and HMPS activity.
(11) Phagocytic index and plasma opsonic activity were decreased in animals reinfused at 0, 30, or 120 minutes following a 3% body weight hemorrhage and in animals reinfused 0, 30, and 90 minutes following hemorrhage to a blood pressure of 40 mm Hg.
(12) No significant difference was found regarding phagocytic ability.
(13) One-hundred spleens from HIV-infected patients which were studied by conventional morphological and immunohistochemical methods exhibited alterations in lymphatic tissue as well as in the mononuclear phagocyte system (MPS); these were probably related directly to HIV infection of lymphocytes and MPS cells.
(14) and liposomes without antibiotic did not enhance intraphagocytic killing of B. abortus in bovine phagocytes.
(15) The most striking change in the host tissue after 7-8 h of penicillin therapy was an elimination of treponemes by penetrating phagocytes.
(16) This indicates that the heterogeneity of the macrophage populations did not change and that the overall populations were activated with respect to phagocytic ability.
(17) Rapid techniques were applied to study functional activity of peripheral blood phagocytes in acute sick patients and upon discharge.
(18) Human mononuclear phagocytes cultured in vitro were tested after preincubation with uremic plasma dialyzed in vitro and the effects of pre and post hemodialysis plasma were compared with the effect of dialyzates equilibrated with uremic plasma in vivo.
(19) Functional characteristics such as nitroblue-tetrazolium reduction, alpha-naphthyl butyrate esterase activity, and phagocytic capability occurred.
(20) The DIF was purified by monitoring the induction of phagocytic activity of mouse myeloblastic leukemia cells (M1).