Results 201 to 210 of about 27,168 (249)
Some of the next articles are maybe not open access.
Nature, 1950
IN 1948, Prof. G. Haggqvist1 reported the production of tetraploid frogs (Rana temporaria) by colchicine treatment at fertilization, all previous workers having been unsuccessful. Chromosome counts were not made. Instead, tetraploidy was inferred from the relatively greater volume of epidermal nuclei of some treated animals as compared with controls ...
R A, BEATTY, M, FISCHBERG
openaire +2 more sources
IN 1948, Prof. G. Haggqvist1 reported the production of tetraploid frogs (Rana temporaria) by colchicine treatment at fertilization, all previous workers having been unsuccessful. Chromosome counts were not made. Instead, tetraploidy was inferred from the relatively greater volume of epidermal nuclei of some treated animals as compared with controls ...
R A, BEATTY, M, FISCHBERG
openaire +2 more sources
Trends in Ecology & Evolution, 1998
In his interesting commentary on transposable elements (TEs), gene silencing and macroevolution, John McDonald[1xMcDonald, J. Trends Ecol. Evol. 1998; 13: 94–95Abstract | Full Text PDF | PubMed | Scopus (52)See all References[1]omitted a major player that has acted in concert with TEs to drive vertebrate and plant evolution, namely, polyploidy.
M A, Matzke, A J, Matzke
openaire +2 more sources
In his interesting commentary on transposable elements (TEs), gene silencing and macroevolution, John McDonald[1xMcDonald, J. Trends Ecol. Evol. 1998; 13: 94–95Abstract | Full Text PDF | PubMed | Scopus (52)See all References[1]omitted a major player that has acted in concert with TEs to drive vertebrate and plant evolution, namely, polyploidy.
M A, Matzke, A J, Matzke
openaire +2 more sources
Nature, 1948
IN the course of experiments on the bactericidal action of X-rays on the R and S phases of Escherichia coli, it was found that the survival-rate in three stocks (76, 111, Ida), irradiated twenty-four hours after seeding, was different1; one of them (stock Ida) was more resistant to the radiation as compared with the other two stocks.
A, BUZZATI-TRAVERSO +2 more
openaire +2 more sources
IN the course of experiments on the bactericidal action of X-rays on the R and S phases of Escherichia coli, it was found that the survival-rate in three stocks (76, 111, Ida), irradiated twenty-four hours after seeding, was different1; one of them (stock Ida) was more resistant to the radiation as compared with the other two stocks.
A, BUZZATI-TRAVERSO +2 more
openaire +2 more sources
1980
Chromosome studies of pteridophytes had their major impetus in the work of Irene Manton (1) who was the first to show the far-reaching significance of Polyploidy in these plants. Her work was followed not only by numerous investigations by her own students at the University of Leeds but by researchers in many parts of the world, including especially ...
W H, Wagner, F S, Wagner
openaire +2 more sources
Chromosome studies of pteridophytes had their major impetus in the work of Irene Manton (1) who was the first to show the far-reaching significance of Polyploidy in these plants. Her work was followed not only by numerous investigations by her own students at the University of Leeds but by researchers in many parts of the world, including especially ...
W H, Wagner, F S, Wagner
openaire +2 more sources
Nature, 1958
IN addition to the four strains of Saccharomyces cerevisiae and one strain of Saccharomyces delbrueckii that form asci with more than four spores per ascus1, I have found eight other strains of Saccharomyces cerevisiae that are able to form asci with five, six, seven, eight and nine smooth, round ascospores. One of these strains was obtained some years
openaire +2 more sources
IN addition to the four strains of Saccharomyces cerevisiae and one strain of Saccharomyces delbrueckii that form asci with more than four spores per ascus1, I have found eight other strains of Saccharomyces cerevisiae that are able to form asci with five, six, seven, eight and nine smooth, round ascospores. One of these strains was obtained some years
openaire +2 more sources
Polyploidy in urban environments
Trends in Ecology & Evolution, 2022Polyploidy is a major driver of evolutionary change in plants, but many aspects of polyploidy in natural systems remain enigmatic. We argue that urban landscapes present an unprecedented opportunity to observe polyploidy in action. Integrating polyploid biology and urban evolutionary ecology, we discuss multiple factors expected to promote polyploid ...
Wendy E. Van Drunen, Marc T.J. Johnson
openaire +2 more sources
1980
The green algae and the charophytes represent the most widely studied groups of algae in respect to their ploidy levels. In some genera increased size accompanies ploidy level changes as well as certain morphological modifications, but in other genera no evident obvious changes can be discerned.
openaire +2 more sources
The green algae and the charophytes represent the most widely studied groups of algae in respect to their ploidy levels. In some genera increased size accompanies ploidy level changes as well as certain morphological modifications, but in other genera no evident obvious changes can be discerned.
openaire +2 more sources
Polyploidy and diploidization in soybean
Molecular Breeding, 2023Polyploidy is widespread and particularly common in angiosperms. The prevalence of polyploidy in the plant suggests it as a crucial driver of diversification and speciation. The paleopolyploid soybean (Glycine max) is one of the most important crops of plant protein and oil for humans and livestock.
Jingya Yuan, Qingxin Song
openaire +2 more sources
1980
There is evidence supporting a concept of polyploid evolution in a number of groups of fungi. These typically have dominant diploid phases in their life-histories. There are a number of reports of suspected polyploidy in other fungi, but these should be considered speculative at this time.
openaire +2 more sources
There is evidence supporting a concept of polyploid evolution in a number of groups of fungi. These typically have dominant diploid phases in their life-histories. There are a number of reports of suspected polyploidy in other fungi, but these should be considered speculative at this time.
openaire +2 more sources
1980
A discussion in gymnosperms as a group is somewhat meaningless so far as discerning trends or ascertaining general principles. It is now generally recognized (1, 2) that g3niinosperms as a class probably never existed, and that gymnospermy should be regarded as a way of life rather than suggesting that the plants possessing naked seeds are somehow ...
openaire +2 more sources
A discussion in gymnosperms as a group is somewhat meaningless so far as discerning trends or ascertaining general principles. It is now generally recognized (1, 2) that g3niinosperms as a class probably never existed, and that gymnospermy should be regarded as a way of life rather than suggesting that the plants possessing naked seeds are somehow ...
openaire +2 more sources