We analyzed and compared genetic structures in groups of black-and-white Holstein cattle that differed in dairy productivity and levels of infectiousness with bovine leucosis virus by evaluating the ...degree of polymorphism in DNA fragments flanked by inverted repeats of two dinucleotide and four trinucleotide microsatellites (ISSR-PCR markers). The spectra of the DNA fragments obtained using primer (AG)
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C united the groups of cows with higher dairy productivity, while those based on primers (GA)
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C, (GAG)
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C, (AGC)
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G, and (ACC)
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G united the cows infected with bovine leucosis virus, irrespective of their milk yields. The article discusses the indirectness of the links between milk production and the sensitivity of animals to the bovine leucosis virus.
Mode-locking in a cw narrowband tunable dye laser whose cavity contains absorbing cells with molecular iodine vapor has been studied experimentally. When the wavelength of radiation of the dye laser ...is tuned to absorption lines of molecular iodine vapor in a cell in the cavity, short pulses following with a period equal to or multiple of the round-trip time of light around the cavity appear. The duration of the generated pulses is about 1 ns, which is much shorter than the phase memory time in iodine vapor. In such a situation, modelocking occurs owing to the coherent character of the interaction of laser radiation with narrow absorption resonances in molecular iodine vapor.
The effect of preheating technology, materials of cathode blocks, and other factors on the integrity of the bottom while using a flame to preheat aluminum reduction cells is investigated. Using ...mathematical modeling in an ANSYS finite-element package and Star-CD CFD-package, the temperature fields, gas dynamics, and stress-strained state of the reduction cell as the flame burns are investigated. The best way to cover the peripheral seams during preheating is selected.
The stage of retrieving long-term memory traces is discussed; studies of this stage can be performed using the phenomenon of dissociated brain states. These states arise in response to various ...external influences and are accompanied by selective, reversible derangements of retrieval processes without alteration of the mechanisms involved in perceiving and fixing information. Analysis of the appearance of dissociated states induced by pharmacological treatments leads to several conclusion: a) reversible derangements affecting the retrieval function are typical of types of memory which depend on attention; b) the hippocampus plays a key role in selecting engrams for extraction from long-term memory; c) the brain's cholinergic and GABAergic mediator systems are involved in regulating the retrieval of long-term memory traces; d) stable derangements of the retrieval of long-term memory traces are accompanied by deep molecular-cellular changes in the hippocampus, including alterations in genetic elements and phosphorylation of synaptic proteins.
The distribution of molecules between the free (intermicellar) and the micelle-bound states is found from the results of selective measurements of their self-diffusion coefficients in micellar ...solutions of ionic surfactants, i.e., sodium dodecylsulfate and cetyltrimethylammonium bromide.
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