Simple Chains
Mostrando 13-24 de 115 artigos, teses e dissertações.
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13. Extração de conhecimento a partir de redes reurais recorrentes / knowledge extraction from recurrent neural networks
ln this work a method ofknowledge extraction from Recurrent Neural Network is proposed. Express formally the knowledge stored inside an Artificial Neural Network is a great challenge, because such knowledge has to be reformulated and presented by simple and understandable means. Three symbolic formats are presented for the representation of this knowledge: F
Publicado em: 2004
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14. Contributions to the investigations of Lascar strong types in simple theories
First, we shall prove some results about thick formulas and bounded equivalence relations, valid in arbitrary complete theories. The application of these results to simple theories yields some nice and useful properties with respect to Lascar strong types. Furthermore, we consider subclasses of simple theories, definable by dividing chains as in [CasWag]. As
Publicado em: 2003
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15. Molecular polymorphism of a cell surface proteoglycan: distinct structures on simple and stratified epithelia.
Epithelial cells are organized into either a single layer (simple epithelia) or multiple layers (stratified epithelia). Maintenance of these cellular organizations requires distinct adhesive mechanisms involving many cell surface molecules. One such molecule is a cell surface proteoglycan, named syndecan, that contains both heparan sulfate and chondroitin su
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16. Group B streptococcal long-chain reaction.
The streptococcal long-chain reaction was adapted for the measurement of type-specific antibodies to group B beta-hemolytic streptococci (GBBHS). Rabbit antisera incubated with homologous but not heterologous GBBHS produced chains that were 18 to 33 times longer than chains produced by normal rabbit sera. The long chains were easily apparent, in most instanc
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17. Forces of tertiary structural organization in globular proteins.
The tertiary structures of globular proteins have remarkable and complex symmetries. What forces cause them? We find that a very simple model reproduces some of those symmetries. Proteins are modeled as copolymers of specific sequences of hydrophobic (H) and polar (P) monomers (HP model) configured as self-avoiding flights on simple three-dimensional cubic l
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18. Effect of changing the size of lipid headgroup on peptide insertion into membranes.
Adsorption of amphiphilic peptides to the headgroup region of a lipid bilayer is a common mode of protein-membrane interactions. Previous studies have shown that adsorption causes membrane thinning. The degree of the thinning depends on the degree of the lateral expansion caused by the peptide adsorption. If this simple molecular mechanism is correct, the de
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19. Diversity of light chain variable region sequences among rabbit antibodies elicited by the same antigens.
We report the complete variable region sequences of three homogeneous rabbit antibody light chains and the partial sequences of five others. Wehn these are compared to other published rabbit light chain sequences, two regions of markedly increased variability are revealed, which are homologous in position to the first and third hypervariable regions of murin
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20. Synthesis of Globin Chains in Sickle β-Thalassemia
In five patients with sickle β-thalassemia there was balanced α- and β-globin synthesis in the bone marrow and decreased total β-chain synthesis relative to that of α-chain in the peripheral blood. These findings are similar to those in patients with simple β-thalassemia trait. Despite a range of hemoglobin concentrations from 6.8 to 12.5 g/100 ml in t
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21. Molecular mechanisms for proton transport in membranes.
Likely mechanisms for proton transport through biomembranes are explored. The fundamental structural element is assumed to be continuous chains of hydrogen bonds formed from the protein side groups, and a molecular example is presented. From studies in ice, such chains are predicted to have low impedance and can function as proton wires. In addition, conform
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22. Immunoturbidimetric assay for estimating free light chains of immunoglobulins in urine and serum.
An immunoturbidimetric assay for the assessment of free kappa and lambda light chains of immunoglobulins was developed using a commercial polyclonal antiserum with reactivity towards epitopes on the light chains, which are not expressed when they are bound to heavy chains. The assay, on a centrifugal analyser, is simple and rapid. The limit of detection is 5
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23. The essential light chain is required for full force production by skeletal muscle myosin.
Myosin, a molecular motor that is responsible for muscle contraction, is composed of two heavy chains each with two light chains. The crystal structure of subfragment 1 indicates that both the regulatory light chains (RLCs) and the essential light chains (ELCs) stabilize an extended alpha-helical segment of the heavy chain. It has recently been shown in a mo
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24. Nature of fetal hemoglobin in the Greek type of hereditary persistence of fetal hemoglobin with and without concurrent β-thalassemia
The fetal hemoglobin in the affected members of three Greek families with the hereditary persistence of fetal hemoglobin has only γ-chains of the type with alanine in position 136. Although certain Negro families had been considered to have only this type of γ-chains in their fetal hemoglobin, further studies required that they be reclassified. Consequentl