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The Postgenomic Era. Genetic Knockout

... all the known forms of behavior—aggression, sexual behavior, sleep and wake, alcohol and drug addictions—are realized via certain mediator systems with involvement of various receptor types for these mediators. The unexampled International Human Genome and Mouse Genome Sequencing Consortiums have demonstrated a considerable similarity between these genomes and made the mouse a favorite genetic object. Scientists involved in studying the main behavior regulator, the brain, have found revolutionary ...

Modified: 30.08.2008
genetic knockout , transgenic mice , knockout mice , MAO-A , genome , behavior , mediators
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Journey to the Invisible World

... extraterrestrials What distinguishes microorganisms from all other living beings on Earth is their potential immortality. Microorganisms reproduce through binary fission, that is, divide in two, which means that they have no predecessors, no dead ancestors. The genome of living bacteria contains all the changes that have taken place in themselves, and not in their late parents — this is their peculiar “life chronicle”. In effect, microorganisms are “clones” and as such they are equivalent. Thanks to ...

Modified: 25.08.2007
microorganisms , geysers , hot springs , bacteria , genome , evolution , origin of life
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Jumping GENES

... is assumed that at least some of them descend from viruses since certain mobile elements are capable of forming virus particles like, for example, the mobile element gipsy of the fruit fly Drosophila melanogaster. Some mobile elements appear in the genome owing to a horizontal transfer. For example, the mobile hobo element of Drosophila melanogaster has repeatedly inserted itself anew into the genome of this species. Some researchers think that certain DNA regulatory regions also display autonomy ...

Modified: 25.02.2007
mobile elements , Drosophila melanogaster , genome , genes , DNA
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Transgenic Relatives

... to fishes, reptiles, birds, and mammals. The place of each group of organisms in the evolutionary process has been determined mainly on the basis of their morphological and physiological relationships, often supported by paleontological records Genomes And Genes At the turn of the 20th century, it became possible to perform evolutionary constructions using not only the formal resemblance between species but also the closeness of their genomes , i.e. the set of genes and genetic elements specifying ...

Modified: 30.09.2004
genome , DNA , gene transfer , genetic information , human , bacteria , evolution
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Is it Easy to Be the Creator?

... with resistance to draught and low response to soil salinization. They transferred two Escherichia coli genes controlling the synthesis of the carbohydrate trehalose , which makes the rice plants resistant to high and low temperatures, into the rice genome. Transgenic food and ornamental plants are already well known. Furthermore, interest in transgenic plants as biological factories producing new materials, biologically active substances and drugs is growing. They could become a new source of proteins ...

Modified: 30.09.2004
DNA , genome , selection , transgenic plants , gene transfer , GMO
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Nucleotide Chronicles of Troubled Time

... concept of ‘species’. Taxonomists faced the challenge when the ancient African lakes, Baikal’s congeners, were investigated. The studies of cichlid fishes proved that the individuals differing in morphology and behavior could have very similar genomes and could easily interbreed under changing environmental conditions. This suggests that the classical genetic definition of ‘species’, which means genetic isolation (otherwise, reproductive isolation), does not work in this case. The disputes ...

Modified: 30.05.2004
Lake Baikal , speciation , genes , genome , evolution , DNA , biodiversity
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