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Agafonov AV, Davydova OI, Krayev AS, Ivanova OS, Evdokimova OL, Gerasimova TV, Baranchikov AE, Kozik VV, Ivanov VK. Unexpected Effects of Activator Molecules' Polarity on the Electroreological Activity of Titanium Dioxide Nanopowders. J Phys Chem B 2017; 121:6732-6738. [PMID: 28613905 DOI: 10.1021/acs.jpcb.7b04131] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Titanium dioxide nanoparticles, obtained using the sol-gel method and modified with organic solvents, such as acetone, acetonitrile, benzene, diethyl ether, dimethyl sulfoxide, toluene, and chloroform, were used as the filler of polydimethylsiloxane-based electrorheological fluids. The effect of electric field strength on the shear stress and yield stress of electrorheological fluids was investigated, as well as the spectra of their dielectric relaxation in the frequency range from 25 to 106 Hz. Modification of titanium dioxide by polar molecules was found to enhance the electrorheological effect, as compared with unmodified TiO2, in accordance with the widely accepted concept of polar molecule dominated electrorheological effect (PM-ER). The most unexpected result of this study was an increase in the electrorheological effect during the application of nonpolar solvents with zero or near-zero dipole moments as the modifiers. It is suggested that nonpolar solvents, besides providing additional polarization effects at the filler particles interface, alter the internal pressure in the gaps between the particles. As a result, the filler particles are attracted to one another, leading to an increase in their aggregation and the formation of a network of bonds between the particles through liquid bridge contacts. Such changes in the electrorheological fluid structure result in a significant increase in the mechanical strength of the structures that arise when an electric field is applied, and an increase in the observed electrorheological effect in comparison with the unmodified titanium dioxide.
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Affiliation(s)
- A V Agafonov
- Krestov Institute of Solution Chemistry, Russian Academy of Sciences , Ivanovo 153045, Russia.,National Research Tomsk State University , Tomsk 634050, Russia
| | - O I Davydova
- Krestov Institute of Solution Chemistry, Russian Academy of Sciences , Ivanovo 153045, Russia
| | - A S Krayev
- Krestov Institute of Solution Chemistry, Russian Academy of Sciences , Ivanovo 153045, Russia
| | - O S Ivanova
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences , Moscow 119991, Russia
| | - O L Evdokimova
- Krestov Institute of Solution Chemistry, Russian Academy of Sciences , Ivanovo 153045, Russia
| | - T V Gerasimova
- Krestov Institute of Solution Chemistry, Russian Academy of Sciences , Ivanovo 153045, Russia
| | - A E Baranchikov
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences , Moscow 119991, Russia
| | - V V Kozik
- National Research Tomsk State University , Tomsk 634050, Russia
| | - V K Ivanov
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences , Moscow 119991, Russia.,Institute of Fine Chemical Technologies, Moscow Technological University , Moscow 119454, Russia
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Agafonov AV, Krayev AS, Davydova OI, Ivanov KV, Shekunova TO, Baranchikov AE, Ivanova OS, Borilo LP, Garshev AV, Kozik VV, Ivanov VK. Nanocrystalline ceria: a novel material for electrorheological fluids. RSC Adv 2016. [DOI: 10.1039/c6ra15095k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanocrystalline CeO2 shows intriguing electroheological performance.
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Affiliation(s)
- A. V. Agafonov
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
- National Research Tomsk State University
- Tomsk
| | - A. S. Krayev
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
| | - O. I. Davydova
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
| | - K. V. Ivanov
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
| | - T. O. Shekunova
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
- Russia
- Lomonosov Moscow State University
- Moscow
| | - A. E. Baranchikov
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
- Russia
- Lomonosov Moscow State University
- Moscow
| | - O. S. Ivanova
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
- Russia
| | - L. P. Borilo
- National Research Tomsk State University
- Tomsk
- Russia
| | | | - V. V. Kozik
- National Research Tomsk State University
- Tomsk
- Russia
| | - V. K. Ivanov
- National Research Tomsk State University
- Tomsk
- Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
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Tomarev SI, Zinovieva RD, Dolgilevich SM, Luchin SV, Krayev AS, Skryabin KG, Gause GG. A novel type of crystallin in the frog eye lens. 35-kDa polypeptide is not homologous to any of the major classes of lens crystallins. FEBS Lett 1984; 171:297-302. [PMID: 6609843 DOI: 10.1016/0014-5793(84)80508-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The nucleotide sequence of a cloned DNA coding for the 35-kDa polypeptide of the eye lens of the frog (Rana temporaria) has been determined. The sequence without connectors and poly(A) tract is 889 nucleotides in length and shows no homology with sequences coding for other classes of crystallins: alpha-, beta-, gamma- or delta-crystallins. The sequence contains one reading frame 675 nucleotides in length, an apparently intact 3'-non-translated region with the polyadenylation signal sequence and a poly(A) tract; the 5'-non-translated region is lost along with part of the coding region; this accounts for about 1/4 of the total mRNA length. The secondary structure prediction according to the Ptitsin - Finkelstein method shows the presence of predominantly beta-strands with only a few alpha-helical regions. We conclude that the 35-kDa polypeptide from the frog eye lens belongs to a new class of eye lens crystallins for which we propose the name epsilon-crystallin.
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Abstract
Three new recombinant cDNA clones coding for gamma-crystallins have been identified in the frog (Rana temporaria) clonotheque by hybrid-selected translation/immunoprecipitation experiments, in addition to the gamma-1-crystallin clone that was isolated and sequenced previously [ Tomarev et al., Gene 17 (1982) 131-138; FEBS Letters 146 (1982) 315-318]. mRNA species coding for all these gamma-crystallins are about 650 nucleotides in length, but differ in structure, as follows from restriction and sequence analysis of the cloned cDNAs. The conclusion is that the R. temporaria genome contains a family of at least four similar but not identical gamma-crystallin genes. The complete nucleotide sequence has been determined for the cDNA of one of these clones coding for gamma-2-crystallin. It is 69% homologous with that of R. temporaria gamma-1-crystallin and contains four regions of partial internal homology corresponding to the four structural folding units of the gamma-crystallin molecules. An unusual feature of the gamma-2-crystallin amino acid sequence is the high lysine/arginine ratio equal to 1.1, in contrast to 0.05-0.16 for other known gamma-crystallins.
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Tomarev SI, Zinovieva RD, Dolgilevich SM, Krayev AS, Skryabin KG, Gause GG. The absence of the long 3'-non-translated region in mRNA coding for eye lens alpha A2-crystallin of the frog (Rana temporaria). FEBS Lett 1983; 162:47-51. [PMID: 6604666 DOI: 10.1016/0014-5793(83)81046-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The nucleotide sequence of a cloned cDNA (clone pRt(1)297; GENE (1982) 17, 131) coding for a 18 kDa polypeptide of the frog eye lens has been determined. The sequence, 791 nucleotide in length has only one long open reading frame (447 nucleotides). The derived amino acid sequence in this frame has greater than 90% homology with the region 25-173 of alpha A2-crystallin amino acid sequence from a related frog species Rana pipiens. The 5'-terminal part of mRNA corresponding to the first 24 amino acids of alpha A2-crystallin has been lost in cloning and substituted by an artefactual sequence. The 3'-terminal part appears to be intact as follows from the presence of the universal poly(A) addition site and poly(A) tract. The 3'-nontranslated region present in frog alpha A2-crystallin mRNA (130 nucleotides) is about 4-times shorter than in mammalian alpha A2-crystallin mRNA. Intact alpha A2-crystallin mRNA with a size of about 700 nucleotides as determined by Northern blot hybridization is about twice smaller than corresponding mammalian mRNAs.
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Krayev AS, Markusheva TV, Kramerov DA, Ryskov AP, Skryabin KG, Bayev AA, Georgiev GP. Ubiquitous transposon-like repeats B1 and B2 of the mouse genome: B2 sequencing. Nucleic Acids Res 1982; 10:7461-75. [PMID: 6296779 PMCID: PMC327023 DOI: 10.1093/nar/10.23.7461] [Citation(s) in RCA: 270] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Mouse genome contains two major families of short interspersed repeats in more than 10(5) copies scattered throughout the whole genome. They are referred to as B1 and B2 sequences since they were first isolated from the genome library by means of a dsRNA-B probe /1/. In this work, two copies of the B2 family were sequenced and compared with the previously sequenced B1 repeat /2/. A B2 ubiquitous repeat is ca. 190 bp long. The members of the family deviate in 3-5% of nucleotides from the consensus sequence. B2 contains regions of homology to the RNA polymerase III split promoter and to 4.5S snRNA I. Both B1 and B2 contain regions which resemble junctions between exons and introns. In contrast to B1, B2 does not contain apparent homologies to papova viral replication origins and a human Alu sequence. One side of the B2 repeat is represented by a very AT-rich sequence (ca. 30 bp long) followed with an oligo (dA) stretch 10-15 nucleotides long. This region of the repeat is the most variable one. The whole unit is flanked with 15-16 bp direct repeats different in sequenced copies of B2. The same is true of some copies of the B1 family. The properties of B1 and B2 repeats suggest that they may represent a novel class of transposon-like elements in eukaryotic genome. A possible role of B-type repeats in genome reorganization, DNA replication and pre-mRNA processing is discussed.
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Tomarev SI, Krayev AS, Skryabin KG, Bayev AA, Gause GG. The nucleotide sequence of a cloned cDNA corresponding to one of the gamma-crystallins from the eye lens of the frog Rana temporaria. FEBS Lett 1982; 146:314-8. [PMID: 6982831 DOI: 10.1016/0014-5793(82)80942-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Janulaitis AA, Petrusite MA, Jaskelavicene BP, Krayev AS, Skryabin KG, Bayev AA. A new restriction endonuclease BcnI from Bacillus centrosporus RFL 1. FEBS Lett 1982; 137:178-80. [PMID: 6277689 DOI: 10.1016/0014-5793(82)80343-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Tchurikov NA, Ilyin YV, Skryabin KG, Ananiev EV, Bayev AA, Krayev AS, Zelentsova ES, Kulguskin VV, Lyubomirskaya NV, Georgiev GP. General properties of mobile dispersed genetic elements in Drosophila melanogaster. Cold Spring Harb Symp Quant Biol 1981; 45 Pt 2:655-65. [PMID: 6266757 DOI: 10.1101/sqb.1981.045.01.083] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Georgiev GP, Ilyin YV, Chmeliauskaite VG, Ryskov AP, Kramerov DA, Skryabin KG, Krayev AS, Lukanidin EM, Grigoryan MS. Mobile dispersed genetic elements and other middle repetitive DNA sequences in the genomes of Drosophila and mouse: transcription and biological significance. Cold Spring Harb Symp Quant Biol 1981; 45 Pt 2:641-54. [PMID: 6266756 DOI: 10.1101/sqb.1981.045.01.082] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Rubtsov PM, Musakhanov MM, Zakharyev VM, Krayev AS, Skryabin KG, Bayev AA. The structure of the yeast ribosomal RNA genes. I. The complete nucleotide sequence of the 18S ribosomal RNA gene from Saccharomyces cerevisiae. Nucleic Acids Res 1980; 8:5779-94. [PMID: 7008030 PMCID: PMC324341 DOI: 10.1093/nar/8.23.5779] [Citation(s) in RCA: 264] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The cloned 18 S ribosomal RNA gene from Saccharomyces cerevisiae have been sequenced, using the Maxam-Gilbert procedure. From this data the complete sequence of 1789 nucleotides of the 18 S RNA was deduced. Extensive homology with many eucaryotic as well as E. coli ribosomal small subunit rRNA (S-rRNA) has been observed in the 3'-end region of the rRNA molecule. Comparison of the yeast 18 S rRNA sequences with partial sequence data, available for rRNAs of the other eucaryotes provides strong evidence that a substantial portion of the 18 S RNA sequence has been conserved in evolution.
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Bayev AA, Krayev AS, Lyubomirskaya NV, Ilyin YV, Skryabin KG, Georgiev GP. The transposable element Mdg3 in Drosophila melanogaster is flanked with the perfect direct and mismatched inverted repeats. Nucleic Acids Res 1980; 8:3263-73. [PMID: 6255410 PMCID: PMC324151 DOI: 10.1093/nar/8.15.3263] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
MDg3 is a family of mobile dispersed genetic elements represented by 15 copies in the haploid genome of D. melanogaster and flanked, like other similar elements, by the regions of homology. In the present work, these regions of mdg3 have been sequenced. The existence of perfect direct repeats 268 base pairs long has been demonstrated. Inverted repeats are located on the gene distal side of them. It is possible to construct a perfect 8 b.p. palindrome or a slightly mismatched 18 b.p. palindrome. The inverted repeats are flanked by two short 5 b.p. direct repeats.
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Krayev AS, Kramerov DA, Skryabin KG, Ryskov AP, Bayev AA, Georgiev GP. The nucleotide sequence of the ubiquitous repetitive DNA sequence B1 complementary to the most abundant class of mouse fold-back RNA. Nucleic Acids Res 1980; 8:1201-15. [PMID: 7433120 PMCID: PMC323986 DOI: 10.1093/nar/8.6.1201] [Citation(s) in RCA: 306] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Three copies of a highly repetitive DNA sequence B1 which is complementary to the most abundant class of mouse fold-back RNA have been cloned in pBR322 plasmid and sequenced by the method of Maxam and Gilbert. All the three have a length of about 130 base pairs and are very similar in their base sequence. The deviation from the average sequence is equal to 4% and the overall mismatch between each two is not higher than 8%. One of the recombinant clones used contained two copies of B1 oriented in the same direction. All of the B1 copies are flanked with sequences which possess nonidentical but very similar structure. They consist of a number of AmCn blocks (where m varies from 2 to 8 and n equals 1-2). These peculiar sequences in all cases are separated from B1 by non-homologous DNA stretches of 2-8 residues. In one case, a long polypurine stretch is located next to such a block. It consists of 74 residues most of which represent a reiteration of the basic sequence AAAAG. We have found two regions within the B1 sequence which are homologous to the intron-exon junctions, especially to those present in the large intron of the mouse beta-globin gene. It may indicate the involvement of the B1 sequence in pre-mRNA splicing.
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Ovchinnikov YA, Guryev SO, Krayev AS, Monastyrskaya GS, Skryabin KG, Sverdlov ED, Zakharyev VM, Bayev AA. Primary structure of an EcoRI fragment of lambda imm434 DNA containing regions cI-cro of phage 434 and cII-o of phage lambda. Gene X 1979; 6:235-49. [PMID: 478301 DOI: 10.1016/0378-1119(79)90060-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Digestion of phage lambda imm434 DNA with restriction endonuclease EcoRI yields 7 fragments. The shortest among them (1287 bp) contains the right part of the phage 434 immunity region and the phage DNA portion proximal to it. The complete primary structure of this fragment has been determined using the chemical method of DNA sequencing. Hypothetical amino-acid sequences of proteins coded by the cro gene of phage 434 and the cII gene of phage lambda, as well as NH2-terminal amino-acid sequences of the cI protein of phage 434 and the O protein of phage lambda, have been deduced solely on the basis of the DNA sequence. The fragment studied contains also the pR and probably prm promoters and the oR operator of phage 434. The sequence coding for them differs from the respective DNA sequence of phage lambda.
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