Hemc
Mostrando 1-12 de 14 artigos, teses e dissertações.
-
1. Estabilidade de agregados pelo método high energy moisture characteristic, em latossolo sob manejo diferenciado
Estudos com a técnica High Energy Moisture Characteristic (HEMC) ainda são incipientes em solos tropicais. Por considerar a HEMC como um potencial de avaliação dos impactos decorrentes da adoção de sistemas de manejo do solo, este trabalho objetivou determinar, por meio desse método, o estado de agregação de um Latossolo que recebeu diferentes doses
Rev. Bras. Ciênc. Solo. Publicado em: 2014-10
-
2. Estabilidade de agregados em solos cultivados com eucalipto
O objetivo deste trabalho foi avaliar a estabilidade de agregados, em solos tropicais sob cultivo de eucalipto e vegetação nativa, e avaliar as relações entre a estabilidade de agregados e alguns atributos químicos e físicos do solo. Foram estudados Argissolos, Cambissolo, Latossolos e Plintossolo dentro de três regiões com cultivo de eucalipto, nos
Pesquisa Agropecuária Brasileira. Publicado em: 2011-01
-
3. Atributos do solo, ambientes e perdas de solo para Ãreas florestadas no sul e leste do Brasil / Soil properties, condition and soil losses for south and east Brazilian forest areas
Eucalyptus cultivation has increased in all Brazilian regions. In order to recommend good management practices it is necessary to understand differences in soil properties where eucalyptus is planted. In addition, aggregate stability analyses have proved to be a useful tool to measure soil effects caused by changes in management practices. Besides, the evalu
Publicado em: 2009
-
4. Nucleotide sequence of the hemC locus encoding porphobilinogen deaminase of Escherichia coli K12.
Porphobilinogen deaminase, the product of the hemC locus in Escherichia coli K12, catalyses the tetrapolymerisation of porphobilinogen (PBG) into the hydroxymethylbilane, preuroporphyrinogen. The hemC locus has been subcloned from the Clarke and Carbon plasmid pLC41-4. The sequence of the hemC structural gene and flanking DNA was determined by the dideoxy ch
-
5. Molecular cloning and sequencing of the hemD gene of Escherichia coli K-12 and preliminary data on the Uro operon.
DNA of plasmid pSAS1002TH (F' ilv+ hemD+ hemC+ cya+) was used to clone the hemD gene of Escherichia coli K-12. Due to poor transformability of the heme-deficient mutants, the restriction fragments of the F' plasmid were first cloned into a mobilizable derivative of pBR322, pSAS1211LP, which was then mobilized into a hemD recA mutant (E. coli SASX419AN). One
-
6. The Bacillus subtilis hemAXCDBL gene cluster, which encodes enzymes of the biosynthetic pathway from glutamate to uroporphyrinogen III.
We have recently reported (M. Petricek, L. Rutberg, I. Schröder, and L. Hederstedt, J. Bacteriol. 172: 2250-2258, 1990) the cloning and sequence of a Bacillus subtilis chromosomal DNA fragment containing hemA proposed to encode the NAD(P)H-dependent glutamyl-tRNA reductase of the C5 pathway for 5-aminolevulinic acid (ALA) synthesis, hemX encoding a hydropho
-
7. The sequence of hemC, hemD and two additional E. coli genes.
-
8. Cloning and characterization of the hemA region of the Bacillus subtilis chromosome.
A 3.8-kilobase DNA fragment from Bacillus subtilis containing the hemA gene has been cloned and sequenced. Four open reading frames were identified. The first is hemA, encoding a protein of 50.8 kilodaltons. The primary defect of a B. subtilis 5-aminolevulinic acid-requiring mutant was identified as a cysteine-to-tyrosine substitution in the HemA protein. Th
-
9. Availability of porphobilinogen controls appearance of porphobilinogen deaminase activity in Escherichia coli K-12.
A hemin-permeable hemB mutant had no 5-aminolevulinate dehydratase (ALA D) and extremely low porphobilinogen deaminase (PBG D) activity. When the structural gene for hemB was introduced into this strain on a single-copy plasmid, both activities were observed. When the mutant was grown on PBG, normal PBG D activity was observed. Moreover, a hemA mutant had li
-
10. Oxygen-Mediated Regulation of Porphobilinogen Formation in Rhodobacter capsulatus
A Rhodobacter capsulatus hemC mutant has been isolated and used to show that oxygen regulates the intracellular levels of porphobilinogen. Experiments using a hemB-cat gene fusion demonstrated that oxygen does not transcriptionally regulate hemB transcription. Porphobilinogen synthase activity is not regulated by oxygen nor is the enzyme feedback inhibited b
American Society for Microbiology.
-
11. Uroporphyrinogen III cosynthase-deficient mutant of Salmonella typhimurium LT2.
A new type of heme-deficient mutant of Salmonella typhimurium LT2 was isolated using neomycin. The mutant, designated as strain SASY74, accumulated uroporphyrin I and coproporphyrin I. Extracts of the mutant converted 5-aminolevulinic acid to uroporphyrin I. Extracts of the mutant SASY74 and of the uroporphyrinogen synthase-deficient mutant SASY32 complement
-
12. Regulation of Alginate Biosynthesis in Pseudomonas syringae pv. syringae
Both Pseudomonas aeruginosa and the phytopathogen P. syringae produce the exopolysaccharide alginate. However, the environmental signals that trigger alginate gene expression in P. syringae are different from those in P. aeruginosa with copper being a major signal in P. syringae. In P. aeruginosa, the alternate sigma factor encoded by algT (ς22) and the res
American Society for Microbiology.