19 Result(s)

Article

The necessity of Darwin: This journal’s tribute to the most influential scientist of all time

Charles Darwin is considered by many to be one of the most influential scientists of all time. His theory of evolution via natural selection was astonishingly prescient in terms of what modern biology has reve...

Stanley K. Sessions, Herbert C. Macgregor in Chromosome Research (2009)

Article

The New Encyclopedia from Academic Press Covering all Aspects of Modern Genetics

Herbert C. Macgregor in Chromosome Research (2002)

Article

Unordered arrangement of chromosomes in the nuclei of chicken spermatozoa

The arrangement of chromosomes in the elongated sperm nuclei of chicken was studied using fluorescence in situ hybridization with probes specific for telomeres of all chromosomes, a microchromosome, the long ...

Irina V. Solovei, Boris I. Joffe, Tetsua Hori, Philippa Thomson… in Chromosoma (1998)

Article

Ordered arrangement and rearrangement of chromosomes during spermatogenesis in two species of planarians (Plathelminthes)

The pattern of distribution of telomeric DNA (TTAGGG), 28S rDNA, and 5S rDNA has been studied using fluorescence in situ hybridization (FISH) and primed in situ labelling during spermatogenesis and sperm form...

Boris I. Joffe, Irina V. Solovei, Herbert C. Macgregor in Chromosoma (1998)

Article

Book reviews

Herbert C. Macgregor, Bernhard H. F. Weber, Rosemary A. Walker in Chromosome Research (1996)

Article

Ends of chromosomes inPolycelis tenuis (Platyhelminthes) have telomere repeat TTAGGG

Boris I. Joffe, Irina V. Solovei, Herbert C. Macgregor in Chromosome Research (1996)

Article

Chromosome research—look forward to 2001

Herbert C. Macgregor in Chromosome Research (1993)

Article

Characterisation of a short, highly repeated and centromerically localised DNA sequence in crested and marbled newts of the genus Triturus

A 32–33 bp highly repeated DNA sequence, TkS1, has been isolated from genomic DNA of the newt Triturus karelini digested with the restriction endonucleases HaeIII or AluI. TkS1 is known to be localised in the cen...

Jennifer M. Varley, Herbert C. Macgregor, Lesley Barnett in Chromosoma (1990)

Article

Centromeric satellite DNA in the newt Triturus cristatus karelinii and related species: Its distribution and transcription on lampbrush chromosomes

Two abundant satellite DNA sequences have been identified in and cloned from the DNA of Triturus cristatus karelinii. The smaller of these with a repeat unit of 33 base pairs (bp) is designated TkS1, the larger w...

Lise Baldwin, Herbert C. Macgregor in Chromosoma (1985)

Article

Chromosome 1 in crested and marbled newts (Triturus)

The heteromorphic chromosomes 1 of Triturus cristatus carnifex and T. marmoratus were studied in mitotic metaphase after staining with the Giemsa C-banding technique and with the fluorochromes, DAPI (AT-specific)...

Simon H. Sims, Herbert C. Macgregor, Patricia S. Pellatt, Heather A. Horner in Chromosoma (1984)

Article

Multiple ribosomal gene sites revealed by in situ hybridization of Xenopus rDNA to Tritums lampbrush chromosomes

A variety of ³H-labelled ribosomal gene probes were hybridized in situ to the nascent transcripts of lampbrush chromosomes from the crested newt, Tritums cristatus carnifex. The probes were from Xenopus laevis an...

Garry T. Morgan, Herbert C. Macgregor, Alan Colman in Chromosoma (1980)

Article

Cytological evidence of transcription of highly repeated DNA sequences during the lampbrush stage in Triturus cristatus carnifex

Highly repeated, or satellite, DNA fractions have been isolated from total Triturus cristatus carnifex DNA by renaturation kinetics, caesium salt centrifugation and restriction endonuclease digestion. We have sho...

Jennifer M. Varley, Herbert C. Macgregor, Irma Nardi, Christine Andrews… in Chromosoma (1980)

Article

Heteromorphism for chromosome 1, a requirement for normal development in crested newts

In all adult males and females of T. cristatus most of the long arm of chromosome 1 is achiasmate and heteromorphic with respect to Giemsa C-staining pattern. This heteromorphism correlates well with the heteromo...

Herbert C. Macgregor, Heather Horner in Chromosoma (1980)

Article

An investigation of some problems concerning nucleolus organizers in salamanders

Observed differences in the sizes of lampbrush nucleolus organizers in Plethodon cinereus have been shown by in situ hybridization to reflect true molecular differences in the numbers of ribosomal cistrons locate...

Herbert C. Macgregor, Marcela Vlad, Lesley Barnett in Chromosoma (1977)

Article

Interspecific “common” repetitive DNA sequences in salamanders of the genus Plethodon

Intermediate repetitive sequences of Plethodon cinereus which comprised about 30% of the genomic DNA were isolated and iodinated with ¹²⁵I. About 5% of the ¹²⁵I-repetitive fraction hybridized with a large excess ...

Shigeki Mizuno, Christine Andrews, Herbert C. Macgregor in Chromosoma (1976)

Article

Chromosomes, DNA sequences, and evolution in salamanders of the genus Plethodon

Chromosomes and DNA sequence homologies have been studied in 15 species of North American salamander belonging to the genus Plethodon. These include 4 Eastern small species, 5 Eastern large species, 5 Western, an...

Shigeki Mizuno, Herbert C. Macgregor in Chromosoma (1974)

Article

Gene amplification in oocytes with 8 germinal vesicles from the tailed frog Ascaphus truei Stejneger

In the last 3 oogonial mitoses in Ascaphus truei all daughter nuclei remain in the same cell. The oocyte is 8-nucleate at the start of meiotic prophase and remains so until late in oogenesis when 7 of the nuclei ...

Herbert C. Macgregor, James Kezer in Chromosoma (1970)

Article

Gene amplification in the oocytes of dytiscid water beetles

A conspicuous mass of extrachromosomal DNA (Giardina's body) is found in oogonia and oocytes of Dytiscid water beetles. Since in older oocytes this DNA is associated with numerous nucleoli, it seemed probable ...

Joseph G. Gall, Herbert C. Macgregor, Mary Elizabeth Kidston in Chromosoma (1969)