Search

We studied the production and signatures of doubly charged Higgs bosons in the process γe→ H E, where E is a heavy lepton, at the e e International Linear Collider (ILC) and CERN Linear Collider (CLIC). The intermediate photons are given by the Weizsäcker-Williams and laser-backscattering distributions. We found that significant signatures are obtained by bremsstrahlung and backward Compton scattering of laser. A clear signal can be obtained for doubly charged Higgs bosons, doubly charged gauge bosons and heavy leptons. [ABSTRACT FROM AUTHOR]

An F population ( Allium fistulosum x A. cepa) of 20plants, 10 BC,[( A. fistulosum x A. cepa) x A. cepa], and 50 BC plants, [( A. fistulosum x A. cepa) x A. cepa] x A. cepa were studied cytogenetically and characterized for four isozyme alleles plus various morphological characteristics. All of the progenies were in A. fistulosum (the bunching onion) cytoplasm. In the F population we observed non-random chromosomal and allelic segregation, suppression of bulb onion allelic expression, and abnormalities in mitosis and meiosis. Most BC plants resembled A. cepa (the bulbing onion) morphologically, but anthers, filaments, pistils, and petals were abnormal. Only 3 plants, and these were most nearly like the F hybrid morphologically, produced any seeds.The data and observations support the hypothesis of nuclear-cytoplasmic incompatibility interactions between the bunching and bulb onion species. [ABSTRACT FROM AUTHOR]

Mitotic and meiotic studies were performed on Allium fistulosum, A. cepa, their F hybrid, and ten selected backcross (BC) plants [( A. fistulosum x A. cepa) x ( A. cepa)]. Each BC plant had at least one A. cepa isozyme allele ( Pgi, Idh, or Adh). Chromosome morphology and behavior differed among plants. Meiocytes were observed with one, two, or three bridges and/ or fragments, indicating at least three paracentric inversions between A. fistulosum and A. cepa. Unusual crossing over and multivalent associations suggest that the 5F subtelocentric chromosome of A. fistulosum is involved in at least one translocation. The number of bridges and fragments and multivalent associations varied between the F hybrid and BC progenies. The F hybrid and all BC progenies were either sterile or had very little seed set. Fertility was not restored in any of the selected BC plants. [ABSTRACT FROM AUTHOR]