Chain Rings
Mostrando 13-24 de 67 artigos, teses e dissertações.
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13. Química e atividades biológicas de Hancornia speciosa Gomes (Apocynaceae):: inibição da enzima conversora de angiotensina (ECA) e efeito na quimioprevenção de câncer
Hancornia speciosa Gomes (Apocynaceae) is a plant species found in cerrado, a savannahlike vegetation, popularly used to treat hypertension and inflammatory processes. Its potential anti-hypertensive activity has been previously demonstrated by in vitro inhibition of angiotensin converting enzyme (ACE) and vasodilatation in rat aortic rings. Several studies
Publicado em: 2007
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14. APLICAÇÃO DO MÉTODO DOS ELEMENTOS FINITOS NA ANÁLISE E PROJETOS DE ESTRUTURAS COAXIAIS / APPLICATION OF FINITE ELEMENTS METHOD IN THE ANALYSIS AND DESIGN OF COAXIAL STRUCTURES
In this work, the Method of Finite Element is applied in the electromagnetic analysis and project of coaxial horns employed as feed in omnidirectional reflector antennas. These feeds are usually excited by standard commercial connectors that require an adaptor to connect to the coaxial horn. This adaptor is usually composed of non-uniform sections of coaxial
Publicado em: 2006
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15. Periodontal and microbiologic evaluation in patients with two methods of orthodontic archwire ligation / Avaliação periodontal e microbiologica em pacientes com dois tipos de ligaduras ortodonticas
A dificuldade no controle de biofilme dentário em paciente sob tratamento ortodôntico promove modificações no periodonto e na microbiota normais da cavidade bucal. Neste aspecto, poucos estudos investigaram os efeitos dos dispositivos de amarração do arco ortodôntico, como ligaduras elásticas e metálicas. Desta maneira, o objetivo deste trabalho foi
Publicado em: 2006
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16. Localização de anestesicos locais do tipo amino-amida em lipossomas uni e multilamelares
Literature carries many theories about the mechanism of action of local anesthetics (LA). We can highlight those that focus on the direct effect of LA on the sodium channel protein and the ones that consider the interaction of anesthetic molecules with the lipid membrane phase. The direct correlation between LA hydrophobicity and anesthetic potency is well k
Publicado em: 2000
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17. Expansão em cumulantes para o Modelo de Anderson Periodico
The diagrammatic expansion in cumulants that was employed by Hubbard to study his model of a narrow band of strongly correlated electrons was extended to the Periodic Anderson Model (PAM). The model was also extended by considering localized electronic states with an arbitrary scheme of energy levels: this extension would be useful to study intermediate vale
Publicado em: 1994
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18. Contribuição ao estudo do ascomiceto chrysonilia sitophila : biodegradação de madeira e seus componentes
Biodegradation of wood and its components by the Ascomycete Chrysonilia sitophila were studied. Optimal growth conditions at pH 6,0, 28°C and nitrogen concentration 50 mEq N/l were observed. Growth in the constitutive nitrogen level and a negligible change in the biotin and tartrate ions presence were found. Nitrogen as either NO3or NH4 was indistinctly ass
Publicado em: 1991
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19. Analysis of the structure of dimeric DNA catenanes by electron microscopy.
We analyzed the structure of open-circular and supercoiled dimeric DNA catenanes generated by site-specific recombination in vitro. Electron microscopy of open-circular catenanes shows that the number of duplex crossings in a plane is a linear function of the number of catenane interlinks (Ca/2), and that the length of the catenane axis is constant, independ
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20. Heteronomous DNA.
A fibrous form of poly d(A):poly d(T) has a heteronomous secondary structure which is the first to be confirmed for a polynucleotide duplex: although both chains are 10(1) helices, mutually hydrogen-bonded in the standard (Watson-Crick) fashion, each has a quite different conformation. One chain -- probably poly d(A) -- has C3'-endo-puckered furanose rings c
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21. Sequence-dependent nucleotide dynamics revealed by intercalated ring rotation in DNA–bisnaphthalimide complexes
Bisnaphthalimide intercalators are anti-tumour agents composed of two planar rings linked by a flexible diazanonylene chain. The intercalated rings of three bisnaphthalimide analogues complexed to DNA are found here to undergo 180° rotating motions that do not affect the diazanonylene linker atoms bound to the major groove. These ring rotations are detected
Oxford University Press.
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22. Metaphase I Orientation of Chain-Forming Interchange Quadrivalents: A Theoretical Consideration
The orientation behavior of chain forming interchange quadrivalents at metaphase I was studied in three interchange heterozygotes of pearl millet [Pennisetum americanum (L.) Leeke] which involve chromosomes 1, 3, 6 and 7 in various combinations. Of these, two combinations predominantly produced rings and the third was a chain-forming type. The chain quadriv
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23. Geometry of interplanar residue contacts in protein structures.
The relative spatial disposition of interacting side-chain planar groups (aromatic, guanidinium, amide, carboxyl, imidazole) is analyzed for 186 non-homologous well-resolved protein structures. The dihedral angle of amide or carboxyl planar groups with other planar groups accords with a random distribution of planes. By contrast, the dihedral angle of the pl
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24. Clathrin-coated pits with long, dynamin-wrapped necks upon expression of a clathrin antisense RNA
To investigate the role of clathrin in coated vesicle formation, a cell line with inducible expression of clathrin heavy chain (CHC) antisense RNA was produced. After 18 h of CHC antisense RNA expression, the internalization of transferrin was inhibited by 90%. Although the amount of CHC was reduced by only 10%, the frequency of clathrin-coated pits at the c
The National Academy of Sciences.