Heteromorphism

The TK+/ fine was originally isolated as a spontaneously arising revertant clone from a UV-induced TK / clone. The parental TK+/+ cell and the heterozygote were then the only TK-competent mouse lymphoma cells that could be maintained in THMG medium (3 pg ml-1 thymidine, 5 pg ml-1 hypoxanthine, 0.1 pg ml-1 methotrexate and 7.5 pg ml-1 glycine) (Clive, 1987). Thus, like most established lines, these cells are remote from wild-type cells. The karyotype of the TK+/ —3.7.2C line has a modal chromosome number of 40 like wild-type, but has a variety of chromosomal rearrangements and centromeric heteromorphisms (Blazak et al., 1986). 

Alternating heteromorphic life stages of some seaweeds exhibit their different morphologies supposedly as a response to differential herbivory pressure, or because of... 

A second problem that has repeatedly concerned us is the inability of the Sequence Rule to provide descriptors for some elements of stereoisomerism. When Cahn et al. (16) first encountered this problem with the all-cis and all-trans isomers of inositol, they attributed it to the fact that the symmetry has become so high that they have no asymmetric, nor even a pseudo-asymmetric atom. This interpretation, we believe, is incorrect. If the two ring ligands of any carbon atom of m-inositol were not heteromorphic, their exchange could not yield an isomer, as it clearly does. Each atom is a center of stereoisomerism with a pair of enantiomorphic ligands (Cg+g hi) and indistinguishable from the traditional pseudoasymmetric atom. The description of cu-inositol as all-5 could be accomplished by the same device that would allow one to specify the configurations of C(l) and C(4) of 4-methylcyclohexanol. 

Gene mapping detection of heteromorphisms and determination of parental origin of heteromorphisms Detection of gene mutations Characterization of structural aberrations Identification of marker chromosomes Characterization of tumor cells Chromosome and karyotype evolution Spatial topography of chromosomes... 

Fig. 2. Amino acid sequence of several representative heteromorphous human core histone variants [12] A. Histone H2A variants in comparison to histone H2A.1 B. CENP-A in comparison to H3.1. The amino acid residues are shaded with intensity proportional to the extent of identity shared among the compared sequences.

Salt marsh plants with spicate flowers and solitary carpels, or aquatic or marsh herbs with heteromorphous styles and a single perianth part, or homomorphous styles a rid carpels six or four and the inner perianth parts inserted higher than the outer.Order Juncaginales... 

Lubchenco, J. and Cubit, J., Heteromorphic life histories of certain marine algae as adaptations to variations in herbivory, Ecology, 61, 676, 1980. 

Dethier, M.N., Heteromorphic algal life histories the seasonal pattern and response to herbivory of the brown crust, Ralfsia califomica, Oecologia, 49, 333, 1981. 

Heteromorphic sex chromosomes were hypothesized to have evolved from a homologous pair of chromosomes by the suppression of crossing-over between the ancestral pair of sex chromosomes and subsequent loss of gene function on the ancestral Y (or W) chromosome.2 One prediction of this hypothesis is that recombination between the X and Y chromosomes (or between the Z and W chromosomes) will be reduced or nonexistent. This prediction is well supported for eutherian mammals with rare exception, recombination between the X and Y chromosomes is reduced to a small region referred to as the pseudoautosomal region. As a consequence, most of the mammalian Y chromosome is isolated in the genome and is thus clonally inherited from father to son. 

Lubchenco J, Cubit J (1980) Heteromorphic life histories of certain marine algae as adaptations to variations in herbivory. Ecology 61 676-687 Madhupratap M, Sawant S, Gauns M (2000) A first report on a bloom of the marine prymnesiophycean, Phaeocystis globosa, from the Arabian Sea. Ocean Acta 23 83-90... 

We will characterize this case (36) as a Craig-type (pd)n system because Craig s original nomenclature 5S> (homomorphic and heteromorphic (pd)v systems) is not applicable for all cases of (pd)n-bonding considered here. 

Due to its high inclusion efficiency, this heteromorphic pigment may be considered to be a suitable red pigment for ceramic applications. 

Mellon D, Tuten HR, Redick J (1989) Distribution of radioactive leucine following uptake by olfactory sensory neurons in normal and heteromorphic crayfish antennules. J Comp Neurol 280 645-662... 

In birds, the female possesses the heteromorphic pair of chromosomes, having the Z and W sex chromosomes, whereas the male has a pair of Z chromosomes. The W chromosome is much smaller than the Z chromosome, being the size of a microchromosome. In most species examined, the W chromosome also has a high proportion of heterochromatin, usually GC-rich (Fritschi Stranzinger, 1985 Auer et al., 1987 Mayr et al., 1989 1990). Chandra (1994) suggests that the W sex chromosome shows the characteristics of an inactive chromosome in somatic cells and could be regarded as facultative helerochromatin. 

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