Global ETD Search
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Showing 1 to 17 of 17 for “"P cluster"”.
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Spectroscopic investigation of nitrogenase: EPR and MCD studies of the FeMo cofactor and the P-cluster
… from an electron delocalized over the entire P-cluster or its return to the Fe protein. The P-cluster is suggested to play a role in the electron transfer from the Fe protein to the cofactor. Apo-proteins were used to provide information about the function and the maturation of the P-cluster. …
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The P Cluster of the Azotobacter vinelandii Nitrogenase Complex: Effects of Substitution at the Cluster-bridging Residue, a-Cys88
… research centers on the role(s) of the P cluster, one of the two unique FeS clusters of the MoFe protein, in the electron transfer mechanism of nitrogenase. Prior to the solution of the x-ray crystal structure of the Azotobacter vinelandii MoFe protein, it was had been determined which of …
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The pathway of electron transfer within the nitrogenase complex
… in the polypeptide matrix that separates the P cluster and the iron-molybdenum cofactor based on the generally accepted view that the P cluster is an intermediate in electron transfer from the Fe protein to the iron-molybdenum cofactor at the substrate reduction site. The results of the …
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Role of the MoFe Protein β-95-Cysteinyl Residue in Nitrogenase Catalysis in <i>Azotobacter vinelandii</i>
… essential ligand to one of the Fe atoms on the P cluster within the MoFe protein of nitrogenase, and a limited number of substitutions at this position resulted in inactive nitrogenase. It was also found that the counterpart of β-95-Cys, α-88-Cys, which also acts as a cysteinyl ligand to the P …
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Site-directed mutagenesis of the nitrogenase MoFe protein from Azotobacter vinelandii
… amino acid ligands to the four 4Fe-4S centers (P-clusters) within the Azotobacter vinelandii nitrogenase MoFe protein is presented. Based on interspecies and intersubunit amino acid comparisons of the α- and ß-subunits of the MoFe protein, and the FeMoco biosynthetic proteins, NifE and NifN, four …
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Profiles of Neuropsychological Functioning in Children and Adolescents with Spina Bifda
… battery. Hierarchical and non-hierarchical cluster analyses were used to identify and confirm a cluster solution. Hypothesized predictors of cluster membership included lesion level, number of shunt surgeries, history of seizures, age, ethnicity, socio-economic status, family stress, and …
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Automatic translation of non-repetitive OpenMP to MPI
<p>Cluster platforms with distributed-memory architectures are becoming increasingly available low-cost solutions for high performance computing. Delivering a productive programming environment that hides the complexity of clusters and allows writing efficient programs is urgently needed. Despite …
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On the Trail of Student Participants: Identifying Barriers to Hunting and Developing a Hunter Recruitment Profile for College Students in Kentucky
… hunter were Time and Lack of Interest. </p> <p>Cluster analysis also revealed an Environmentally Inclined group (EINC) of college students who were slightly more interested in hunting than the Environmentally Indifferent group (EIND). A Potential Hunter (PH) group was also made up of individuals …
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Factors affecting plant community composition and dynamics in the Ossipee Pine Barrens, New Hampshire
… dbh and ≥1 m tall) relative densities.</p><p>Cluster analysis produced three community types from 121 STA's: pitch pine, mixed pine-hardwoods, and red maple. Pitch pine communities comprised 63% of sites in 1952, but declined since. Mixed pine-hardwoods peaked at 58% in 2002, but were …
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On Cluster Robust Models
<p>Cluster robust models are a kind of statistical models that attempt to estimate parameters considering potential heterogeneity in treatment effects. Absent heterogeneity in treatment effects, the partial and average treatment effect are the same. When heterogeneity in treatment effects occurs, …
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Neuroengineering of Clustering Algorithms
<p>"Cluster analysis can be broadly divided into multivariate data visualization, clustering algorithms, and cluster validation. This dissertation contributes neural network-based techniques to perform all three unsupervised learning tasks. Particularly, the first paper provides a comprehensive …
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A Student Induction Program’s Impact on Young “Techies’” Purpose In Life and its Effects on Their Well-Being: A Case Study of Telangana, India
… are consistent with institutional ethos.</p> <p>Cluster analysis was used to identify purpose profiles and found that other-oriented purposeful youth demonstrated greater well-being than disengaged youth. Psychometric analysis of the revised Stanford Purpose Instrument was satisfactory, and the …
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The Biosynthesis and Function of Nitrogenase Metalloclusters
… of N2 to ammonia (nitrogen fixation). The metalloclusters associated with the nitrogenase components include the [4Fe-4S] cluster of the Fe protein, and the P-cluster [8Fe7S] and FeMo-cofactor [7Fe-9S-Mo-X-homocitrate], both contained within the MoFe protein. These metal-complexes play a vital …
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Azotobacter vinelandii Nitrogenase: Effect of Amino-Acid Substitutions at the Alpha Gln-191 Residue of the MoFe Protein on Substrate Reduction and CO Inhibition
… adjacent to Alpha Cys-62, which ligates to the P cluster (the second type of prosthetic group in the MoFe protein). A variety of altered MoFe proteins produced by the A. vinelandii mutant strains, namely the Alpha Pro-191, Alpha Ser-191, Alpha Thr-191, Alpha His-191, Alpha Glu-191, and Alpha …
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Marginal Methods for the Design and Analysis of Cluster Randomized Trials and Related Studies
<p>Cluster randomized trials (CRTs) are used to study the effectiveness of complex or community-level interventions across a diverse range of contexts. These contexts present a range of logistical and statistical challenges to the design and analysis of CRTs and related studies, such as …
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Biosynthesis of the Nitrogenase FeMo-cofactor from Azotobacter vinelandii: Involvement of the NifEN complex, NifX and the Fe protein
… also serves as a model for complex metallocluster biosynthesis. Research in the Dean Lab is focused on furthering the understanding of Fe-S cluster biosynthesis in the nitrogenase enzyme system. Throughout the years, scientists from a broad range of disciplines have focused their …
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Couples coping with clusters: Lived experiences of cluster headache patients and partners
Cluster headache (CH) is a primary headache disorder associated with excruciating pain around the eyes or temples. The pain is compared to having red-hot pokers or ice-pics driven into and through one’s eye. Approximately 124 out of 100,000 people experience CH during their lifetimes. Scant …