Feedback Aggregation
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Investigação das ectonucleotidases na diferenciação de macrófagos e na ativação de plaquetas : o papel da homocisteína
Extracellular nucleotides modulate a variety of biological actions via purinergic receptor activation. These effects are modulated by ectonucleotidases, such as ENTPDases and ecto-5´- NT/CD73, which hydrolyze ATP to adenosine in the extracellular milieu. In the cells of the immune system, the ATP can act as danger signaling whereas adenosine, the ATP breakd
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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2. Validation of criteria for nosocomial use of amikacin in Brazil with the Delphi technique
The Delphi technique has been used since the 1950s to collect the opinions of experts; to gauge their indications, and in some instances, to develop a consensus. This systematic collection and aggregation of informed judgments from a group of experts on specific questions or issues is a highly efficient and cost-effective means to establish guidelines and po
Brazilian Journal of Infectious Diseases. Publicado em: 2006-06
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3. Guaranteed cost fuzzy controllers for a class of uncertain nonlinear dynamic systems
Stability analysis and a systematic robust fuzzy control design for uncertain nonlinear systems with polytopic uncertainties are presented. The approach given uses the T-S fuzzy systems which are represented by a family of local uncertain linear systems with aggregation. The resulting fuzzy controller is a blending of state feedback gains obtained from a gua
Computational & Applied Mathematics. Publicado em: 2005-04
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4. Communications de Groupes : Analyse et Performances des Mécanismes de Agrégation de lnformation de Contrôle
Qu elles soient déjà existantes ou pressenties, les applications multiparties fondées sur un service de multidiffusion requièrent pour certaines le retour d information des participants qu elles mettent en rapport. Selon ces applications, les informations générées peuvent être utilisées par une source émettrice pour réaliser du contrôle de flux o
Publicado em: 2004
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5. Contribuição a redução de ordem e controle de sistemas discretos multivariaveis
In this work methods of aggregation and time-separation to derive reduced oder models are researched. Technics of discrete control by state and output feedback are researched too. The Schur decomposition is proposed and used to obtain numerically more stable and efficient algorithms for oder reduction and control. The obtainment of reduced oder models os dif
Publicado em: 1990
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6. EFFECTS OF FEEDBACK MODIFIERS ON THE STATE OF AGGREGATION OF HOMOSERINE DEHYDROGENASE OF RHODOSPIRILLUM RUBRUM*†
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7. Positive genetic feedback governs cAMP spiral wave formation in Dictyostelium.
The aggregation stage of the life cycle of Dictyostelium discoideum is governed by the chemotactic response of individual amoebae to excitable waves of cAMP. We modeled this process through a recently introduced hybrid automata-continuum scheme and used computer simulation to unravel the role of specific components of this complex developmental process. Our
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8. Stress Granule Assembly Is Mediated by Prion-like Aggregation of TIA-1D⃞
TIA-1 is an RNA binding protein that promotes the assembly of stress granules (SGs), discrete cytoplasmic inclusions into which stalled translation initiation complexes are dynamically recruited in cells subjected to environmental stress. The RNA recognition motifs of TIA-1 are linked to a glutamine-rich prion-related domain (PRD). Truncation mutants lacking
The American Society for Cell Biology.
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9. The Chemical Chaperone Proline Relieves the Thermosensitivity of a dnaK Deletion Mutant at 42°C
Since, like other osmolytes, proline can act as a protein stabilizer, we investigated the thermoprotectant properties of proline in vitro and in vivo. In vivo, elevated proline pools in Escherichia coli (obtained by altering the feedback inhibition by proline of γ-glutamylkinase, the first enzyme of the proline biosynthesis pathway) restore the viability of
American Society for Microbiology.
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10. Regulated Enzymes of Aromatic Amino Acid Synthesis: Control, Isozymic Nature, and Aggregation in Bacillus subtilis and Bacillus licheniformis
Several regulated enzymes involved in aromatic amino acid synthesis were studied in Bacillus subtilis and B. licheniformis with reference to organization and control mechanisms. B. subtilis has been previously shown (23) to have a single 3-deoxy-d-arabinoheptulosonate 7-phosphate (DAHP) synthetase but to have two isozymic forms of both chorismate mutase and
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11. Two-phase regulatory pathway controls cAMP receptor-mediated expression of early genes in Dictyostelium.
Two classes of early genes in Dictyostelium are differentially regulated by extracellular pulses of cAMP interacting with its cell-surface receptor, conditions that also regulate chemotaxis and aggregation. The pulse-repressed genes, such as K5, are induced shortly after the onset of starvation and are repressed a few hr later during aggregation by cAMP puls
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12. DIF-1 induces its own breakdown in Dictyostelium.
DIF-1 is a novel chlorinated alkyl phenone which induces differentiation of prestalk cells in Dictyostelium discoideum. It is broken down and inactivated by a cytoplasmic enzyme, DIF-1 3(5)-dechlorinase (hereafter referred to as DIF-1 dechlorinase), which is found only in prestalk cells. We show that DIF-1 dechlorinase levels are induced at least 50-fold whe