(n.) Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.
(a.) Having the valence of a pentad.
Example Sentences:
(1) Thrombotic thrombocytopenic purpura (TTP) is characterized by the pentad of fever, thrombocytopenia, microangiopathic hemolytic anemia, fluctuating neurologic symptoms, and renal dysfunction.
(2) This case supports the associational of thoracoabdominal ectopia cordis (Cantrell's pentad) with chromosomal errors, specifically trisomy 18.
(3) Of the 41 botulinal toxin-positive persons, 38 (93%) had at least three of the commonly recognized pentad of signs or symptoms--nausea and vomiting, dysphagia, diplopia, dilated and fixed pupils, or dry mouth and throat--and 20 (49%) required respiratory assistance.
(4) Review of the reported literature of the Pentalogy of Cantrell and various combinations of the anomalies within the spectrum of this pentad suggests that the PC defines a specific midline ventral developmental field.
(5) There was an increase in the numbers of 'bare' T-tubules and an increased occurrence of diadic, pentadic and heptadic junctions between the membranes of the T-tubules and terminal cisternae.
(6) It is characterized by a pentad of clinical findings: fever, neurological abnormalities, renal dysfunction, microangiopathic hemolytic anemia and thrombocytopenia.
(7) Clinical signs and symptoms of nausea and vomiting, dysphagia, diplopia, dilated pupils, and dry throat occurred with great frequency, forming a diagnostic pentad.
(8) Other clinical features were present inconsistently, and only 34% of "TTP" episodes involved the classic pentad of hemolytic anemia, thrombocytopenia, neurologic disorders, noninfectious fever, and renal impairment.
(9) Common bile duct lithiasis was responsible in 80% of cases presenting with Reynolds' pentad and in 66% of postoperative mortality.
(10) The presence of renal impairment, occurring as frequently as any of the pentad of features that characterize the syndrome, has important implications for the prognosis and long term management of these patients.
(11) By using more specific criteria than the classical clinical pentad, the diagnosis of thrombotic thrombocytopenic purpura during pregnancy can be made with greater accuracy.
(12) It is characterized by a pentad of clinical findings, including microangiopathic hemolytic anemia, thrombocytopenic purpura, neurologic and renal abnormalities, and fever.
(13) Information from out patients with thrombotic thrombocytopenic purpura implicates respiratory dysfunction as a component of this disease as well as the classically described pentad.
(14) Nuclear chain fibers, in contrast, possess an unusually well-developed SR and T system and a variety of multiple junctional couplings (dyads, triads, quatrads, pentads, septads).
(15) 23% of the 17 patients with pus in the bile duct showed Reynolds' pentad, which was observed in 10% of patients with nonsuppurative acute cholangitis.
(16) During anaphase I the pentad sex chromosomes lie freely between the two sister cells.
(17) It is of prognostic significance, and should be considered as important as the clinical findings of Reynold's pentad.
(18) Thrombotic thrombocytopenic purpura (TTP) is a rare disorder of unknown etiology, clinically characterized by a diagnostic pentad (thrombocytopenia, microangiopathic hemolytic anemia, neurologic signs and symptoms, fever and renal damage).
(19) Diagnosis of TTP is usually made on the basis of the pentad of anemia, thrombocytopenia, renal disease, neurologic abnormalities, and fever.
(20) The tetrade "REST syndrome" becomes in these cases the pentade "CREST syndrome".
Polyad
Definition:
Example Sentences:
(1) Implications are indicated in polyadic systems, and a new aspect of transference is noted.
(2) Pollen of acacias is transported by insects as polyads, composite pollen grains.
(3) This defect correlates with several abnormalities in subsequent developmental events including the formation of multinucleate daughter cells, multiple microspindles during meiosis II, multiple phragmoplasts, polyads of microspores, and cytoplasmic microtubule foci.
(4) The polyad has enough pollen grains to fertilize all ovules within a flower and hence all seed within a pod may be full sibs.
(5) A series of experiments has been carried out with single doses of simple analgesics in patients with rheumatoid arthritis using a consistent polyad design.
(6) The following main anomalies of meiosis were revealed: the univalent state of chromosomes; an irregular movement of 8 to 33 chromosomes to the poles; the lag of 6 to 25 chromosomes and their premature splitting into chromatids; formation of micronuclei in diads and tetrads, formation of polyads.