منابع مشابه
Genome structure of bdelloid rotifers: shaped by asexuality or desiccation?
Bdelloid rotifers are microscopic invertebrate animals best known for their ancient asexuality and the ability to survive desiccation at any life stage. Both factors are expected to have a profound influence on their genome structure. Recent molecular studies demonstrated that, although the gene-rich regions of bdelloid genomes are organized as colinear pairs of closely related sequences and de...
متن کاملFine Structure of the Cilia of Rotifers
The fine structure of the coronal cilia of the rotifer Philodina citrina has been studied in detail. Specimens were fixed with OsO(4) and embedded in butyl-methyl methacrylate, Epon 812, or Vestopal and sectioned with a Porter-Blum microtome. The details of structure of the rootlets, basal bodies, basal plates, and free cilia are described. The general structure of the rotifer ciliary apparatus...
متن کاملBdelloid rotifers revisited.
S exual reproduction is one of the most striking features of the biological world. The great majority of the animals and plants with which we are most familiar reproduce at least part of the time by means of sexual reproduction with meiosis, recombination, and fertilization. But many eukaryotes reproduce asexually part of the time, and some are exclusively asexual (1, 2). Two articles in a rece...
متن کاملUrmia Lake desiccation and the signs of local climate changes
The water crisis is one of the important issues in the Middle East countries. Many lakes are drying up and/or facing critical situations, exerting tremendous impacts on the socio-economics of their region. Lake Urmia, in northwestern Iran, currently is facing critical situations and is on the brink of total shrinkage and environmental disaster. This paper investigates the roots of crises t...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1908
ISSN: 0003-0147,1537-5323
DOI: 10.1086/278991