(n.) An element, atom, or radical having a valence or combining power of two.
(a.) Having a valence or combining power of two; capable of being substituted for, combined with, or replaced by, two atoms of hydrogen; as, oxygen and calcium are dyad elements. See Valence.
Example Sentences:
(1) The 3' end of the cell cycle regulated mRNA terminates immediately following the region of hyphenated dyad symmetry typical of most histone mRNAs, whereas the constitutively expressed mRNA has a 1798 nt non-translated trailer that contains the same region of hyphenated dyad symmetry but is polyadenylated.
(2) Termination of sar RNA synthesis occurs after transcription of the first and second Ts of a TTTA sequence following a region of hyphenated dyad symmetry.
(3) Sixty mother-toddler dyads (30 boys and 30 girls) participated as subjects.
(4) The reciprocal (equivalent) and nonreciprocal (excessive giving or receiving) exchange of services was measured by the frequency of exchange and perception of potential support between the dyad.
(5) Because current family systems theory indicates that positive individual relationships within a dyad (e.g., child-mother) should be related to an overall favorable impression of the family system, we hypothesized that these two instruments should demonstrate convergence on selected dimensions.
(6) The purpose of the study was to determine the effect of two interventions, Calorie Management and Socioemotional Growth Fostering, on (a) the weight of children aged 1 to 3 years with nonorganic failure to thrive and (b) the interaction behaviors of 10 mother-child dyads.
(7) Most of the literature on this subject has indicated, contrary to the findings reported here, that full and intense erotic transference manifestations are rarely if ever seen in this therapeutic dyad.
(8) (2) The peak-to-peak spacing in this distribution is significantly different from 10.3 bases in the region covering three helix turns immediately 5' of the dyad axis.
(9) Assertive needs produced the largest number od dyads which discriminated (p less than .05) clinical and control groups.
(10) However, two mutations which increased the dyad symmetry of part of the binding site yielded ligands with a higher affinity for MDBP.
(11) This mutation is partly located within a region of dyad symmetry.
(12) The purpose of this study was to compare dyadic interaction behavior of traumatically disabled and nondisabled men paired in homogeneous or mixed dyads.
(13) MCM1 binds to the dyad symmetry element 5'-CCTAATTAGG and related sequences, which we refer to as MCM1 control elements (MCEs).
(14) Data also suggest that black dyads are represented more frequently in the positive categories, and white dyads are more likely to be categorized as "apathetic" or "hostile."
(15) (2) Coincident disomy increased as a function of the mean number of disomic chromosomes per spore in each dyad, but this increase differed functionally from that expected if coincident disomy in the two ascospores were a simple, meiotically independent, concomitant of multiple disomy.
(16) Binding sites for the GAL4-positive regulatory protein have been identified upstream of six galactose-inducible genes of Saccharomyces cerevisiae on the basis of (i) protection in DNAse I footprints, (ii) loss of protection when excess GAL4-binding oligonucleotide is added and (iii) homology with a 23-bp dyad-symmetric consensus sequence.
(17) The distance from spouse (or partner) repeats within the marital dyad the lack of closeness to parents experienced in adolescence.
(18) Mothers in B2 and B3 dyads were rated more sensitive and responsive than all others at all 4 observations.
(19) Maternal stimulation and co-ordinated infant signalling in AGA dyads, and infant quietness and maternal activity encouraging quietness in SGA dyads, were patterns in high-scoring subjects.
(20) Encouragement of open, direct communication between members of a dyad may produce favorable or unfavorable results, depending upon the situation.
Valence
Definition:
(n.) The degree of combining power of an atom (or radical) as shown by the number of atoms of hydrogen (or of other monads, as chlorine, sodium, etc.) with which it will combine, or for which it can be substituted, or with which it can be compared; thus, an atom of hydrogen is a monad, and has a valence of one; the atoms of oxygen, nitrogen, and carbon are respectively dyads, triads, and tetrads, and have a valence respectively of two, three, and four.
Example Sentences:
(1) The mixed-valence-state cytochrome oxidase mixed with O2 at -24 degrees C and flash-photolysed at -60 to -100 degrees C reacts with O2 and initially forms an oxy compound (A2) similar to that formed from the fully reduced state (A1).
(2) Additional results, together with simulations based on a simple kinetic model, suggest that the reduced apparent valence of the low slope component of the Q-V curve results from gating charge immobilization occurring at holding potential.
(3) A related explanation is that the 609 nm absorbance involves a charge-transfer interaction of both iron and copper as a mixed-valence binuclear complex, Cua3, having properties of a non-blue copper.
(4) RBDs were significantly more impaired than LBDs or NCs on category and valence accuracy, while LBDs posed expressions with significantly more intensity than RBDs or NCs.
(5) The extent of adsorption was affected by the concentration and valency of cations, indicating a charge-dependent process.
(6) Use of that principle was demonstrated by fourth grade children who judged that telling the truth, as opposed to lying, was shown by a consistency between the affective valence of the verbal and the nonverbal communications.
(7) Research reported here shows that primary and transferred releasing valences are differentially affected by environmental variables.
(8) Furthermore, the valences of all ions in solution on both sides of the membrane are taken to be of equal absolute magnitude.
(9) Possible valence bond structures for 3-methylpurine residues in DNA are discussed, leading to the suggestion that ionized forms with positively charged amino groups may be the most effective blocks to template activity.
(10) A confirmatory factor analysis on these subscales showed that the Affective Valence, Empathic Caring, Self-Sacrifice, and Societies' Duties subscales each reflect a humanitarian concern for children and that the Instrumentality and Authoritarian Attitude subscales tap values involving a moralistic expectation of children.
(11) The excitatory potential, the involvement potential, and the hedonic valence of the nonerotic and erotic stimuli were also assessed.
(12) A monovalent form of concanavalin A (m-Con A) has been prepared to determine the importance of valence for human lymphocyte surface binding and subsequent lymphocyte stimulation as measured by blast transformation and cytotoxicity.
(13) As concerns the valence of the natural focus, the most important was the inundated forest in the Drnholec locality.
(14) Examination of the antigen dose-response curves and maximal responses obtained suggests that valency of the antigen may be important both in determining the avidity of interaction between the pCTL and the antigen-bearing structure, and in determining the extent to which localized receptor cross-linking occurs on the cell surface to result in triggering.
(15) Therefore, no conclusions about biological valence and tumour localisation could be drawn from the aspect of the cell picture which we observed and from the degree of pleocytosis.
(16) During presentation of pictures with negative valence the m. frontalis lateralis and the m. corrugator supercilii revealed enhanced EMG-reactions as compared to the repeated presentation of pictures with positive valence.
(17) The degree and the character of these changes depend on cation valency and the initial value of cell EM.
(18) Maximum adsorption at 23 degrees C occurred within 2 h. The amounts of DNA which adsorbed to sand increased with the salt concentration (0.1 to 4 M NaCl and 1 mM to 0.2 M MgCl2), salt valency (Na+ less than Mg2+ and Ca2+), and pH (5 to 9).
(19) The influence of valence and heavy chain on antibody activity was investigated using transfectoma-derived, class-switched IgG1 and IgM human monoclonal antibodies (MAbs) reactive with the bacterial pathogens Escherichia coli K1 and group B Streptococcus species.
(20) The obtained data allows to suggest that one of the possible mechanisms of 6-ONDA neurotoxic action includes the generation of superoxide, whose dismutation to hydrogen peroxide in the presence of transient valency ions gives rise to HO.