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Orso C, Stefanello TB, Franceschi CH, Mann MB, Varela APM, Castro IMS, Frazzon J, Frazzon APG, Andretta I, Ribeiro AML. Changes in the ceca microbiota of broilers vaccinated for coccidiosis or supplemented with salinomycin. Poult Sci 2021; 100:101388. [PMID: 34334176 PMCID: PMC8408349 DOI: 10.1016/j.psj.2021.101388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Grassotti TT, Zvoboda DA, Costa LFX, Christiano FDP, Mann MB, Wagner PGC, Campos AAS, Frazzon J, Frazzon APG. Intra and inter-monkey transmission of bacteria in wild black capuchins monkeys (Sapajus nigritus): a preliminary study. BRAZ J BIOL 2021; 82:e237460. [PMID: 34133553 DOI: 10.1590/1519-6984.237460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 10/15/2020] [Indexed: 01/01/2023] Open
Affiliation(s)
- T T Grassotti
- Universidade Federal do Rio Grande do Sul - UFRGS, Programa de Pós-graduação em Microbiologia Agrícola e do Ambiente, Porto Alegre, RS, Brasil
| | - D A Zvoboda
- Universidade Federal do Rio Grande do Sul - UFRGS, Departamento de Microbiologia, Imunologia e Parasitologia, Porto Alegre, RS, Brasil
| | - L F X Costa
- Universidade Federal do Rio Grande do Sul - UFRGS, Programa de Pós-graduação em Microbiologia Agrícola e do Ambiente, Porto Alegre, RS, Brasil
| | - F D P Christiano
- Universidade Federal do Rio Grande do Sul - UFRGS, Departamento de Microbiologia, Imunologia e Parasitologia, Porto Alegre, RS, Brasil
| | - M B Mann
- Universidade Federal do Rio Grande do Sul - UFRGS, Programa de Pós-graduação em Microbiologia Agrícola e do Ambiente, Porto Alegre, RS, Brasil
| | - P G C Wagner
- Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis - IBAMA, Porto Alegre, RS, Brasil
| | - A A S Campos
- Secretaria da Saúde do Estado do Rio Grande do Sul, Centro Estadual de Vigilância em Saúde - CEVS, Porto Alegre, RS, Brasil
| | - J Frazzon
- Universidade Federal do Rio Grande do Sul - UFRGS, Instituto de Ciência e Tecnologia de Alimentos, Porto Alegre, RS, Brasil
| | - A P G Frazzon
- Universidade Federal do Rio Grande do Sul - UFRGS, Programa de Pós-graduação em Microbiologia Agrícola e do Ambiente, Porto Alegre, RS, Brasil.,Universidade Federal do Rio Grande do Sul - UFRGS, Departamento de Microbiologia, Imunologia e Parasitologia, Porto Alegre, RS, Brasil
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Orso C, Stefanello TB, Franceschi CH, Mann MB, Varela APM, Castro IMS, Frazzon J, Frazzon APG, Andretta I, Ribeiro AML. Changes in the ceca microbiota of broilers vaccinated for coccidiosis or supplemented with salinomycin. Poult Sci 2020; 100:100969. [PMID: 33684651 PMCID: PMC7938242 DOI: 10.1016/j.psj.2020.12.066] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 11/28/2020] [Accepted: 12/15/2020] [Indexed: 01/04/2023] Open
Abstract
The objective of this study was to characterize differences in the cecal microbiota of chickens vaccinated for coccidiosis or receiving salinomycin in the diet. In this study, 140 male 1-day-old broiler chickens were divided in 2 groups: vaccine group (live vaccine) vaccinated at the first day and salinomycin group (125 ppm/kg since the first day until 35 d of age). Each treatment was composed for 7 replicates of 10 birds per pen. At 28 d, the cecal content of one bird per replicate was collected for microbiota analysis. The genetic sequencing was conducted by the Miseq Illumina platform. Vaccine group showed lower body weight, weight gain, and poorer feed conversion in the total period (P < 0.05). Bacterial 16S rRNA genes were classified as 3 major phyla (Bacteroidetes, Firmicutes, and Proteobacteria), accounting for more than 98% of the total bacterial community. The microbiota complexity in the cecal was estimated based on the α-diversity indices. The vaccine did not reduce species richness and diversity (P > 0.05). The richness distribution in the salinomycin group was larger and more uniform than the vaccinated birds. Salinomycin group was related to the enrichment of Bacteroidetes, whereas Firmicutes and Proteobacteria phyla were in greater proportions in the vaccine group. The last phylum includes a wide variety of pathogenic bacteria. The vaccine did not decrease the species richness but decreased the percentage of Bacteroidetes, a phylum composed by genera that produce short-chain fatty acids improving intestinal health. Vaccine group also had higher Proteobacteria phylum, which may help explain its poorer performance.
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Affiliation(s)
- C Orso
- Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - T B Stefanello
- Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - C H Franceschi
- Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - M B Mann
- Department of Microbiology, Porto Alegre, Rio Grande do Sul, Brazil
| | - A P M Varela
- Department of Microbiology, Porto Alegre, Rio Grande do Sul, Brazil
| | - I M S Castro
- Universidade Federal de Ciências de Saúde de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - J Frazzon
- Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - A P G Frazzon
- Department of Microbiology, Porto Alegre, Rio Grande do Sul, Brazil
| | - I Andretta
- Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - A M L Ribeiro
- Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
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Mann MB, Wu S, Rostamkhani M, Tourtellotte W, MacMurray J, Comings DE. Phenylethanolamine N-methyltransferase (PNMT) gene and early-onset Alzheimer disease. Am J Med Genet 2001; 105:312-6. [PMID: 11378842 DOI: 10.1002/ajmg.1363] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The activity of human phenylethanolamine N-methyltransferase (PNMT) is reduced in the neurons of those cells in many subcortical areas of the brain that are known to undergo neurodegeneration in Alzheimer disease (AD). Others have reported that PNMT is decreased in brains of persons with AD and that the decrease in enzymatic activity is due to a reduced amount of the enzyme protein. We have previously described two polymorphisms, G-353A and G-148A, in the promoter region of the gene coding for PNMT. These markers were tested for their association with the occurrence of sporadic AD. Genotyping of 131 necropsy confirmed AD cases, and 947 adult nondemented controls were completed. We observed a significant association between both of the PNMT gene polymorphisms and early-onset AD (EOAD) (P < or = 0.007), but not in late-onset AD (LOAD). These data suggest that genetic variation in the promoter of the PNMT gene is associated with increased susceptibility to the sporadic form of EOAD.
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Affiliation(s)
- M B Mann
- Department of Medical Genetics, City of Hope Medical Center, Duarte, California, USA
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Comings DE, Gade-Andavolu R, Gonzalez N, Wu S, Muhleman D, Blake H, Mann MB, Dietz G, Saucier G, MacMurray JP. A multivariate analysis of 59 candidate genes in personality traits: the temperament and character inventory. Clin Genet 2000; 58:375-85. [PMID: 11140838 DOI: 10.1034/j.1399-0004.2000.580508.x] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cloninger (Cloninger CR. Neurogenetic adaptive mechanisms in alcoholism. Science 1987: 236: 410-416) proposed three basic personality dimensions for temperament: novelty seeking, harm avoidance, and reward dependence. He suggested that novelty seeking primarily utilized dopamine pathways, harm avoidance utilized serotonin pathways, and reward dependence utilized norepinephrine pathways. Subsequently, one additional temperament dimension (persistence) and three character dimensions (cooperativeness, self-directedness, and self-transcendence) were added to form the temperament and character inventory (TCI). We have utilized a previously described multivariate analysis technique (Comings DE, Gade-Andavolu R, Gonzalez N et al. Comparison of the role of dopamine, serotonin, and noradrenergic genes in ADHD, ODD and conduct disorder. Multivariate regression analysis of 20 genes. Clin Genet 2000: 57: 178-196; Comings DD, Gade-Andavolu R, Gonzalez N et al. Multivariate analysis of associations of 42 genes in ADHD, ODD and conduct disorder. Clin Genet 2000: in press) to examine the relative role of 59 candidate genes in the seven TCI traits and test the hypothesis that specific personality traits were associated with specific genes. While there was some tendency for this to be true, a more important trend was the involvement of different ratios of functionally related groups of genes, and of different genotypes of the same genes, for different traits.
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Affiliation(s)
- D E Comings
- Department of Medical Genetics, City of Hope Medical Center, Duarte, CA 91010, USA
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Hsu YR, Chang WC, Mendiaz EA, Hara S, Chow DT, Mann MB, Langley KE, Lu HS. Selective deamidation of recombinant human stem cell factor during in vitro aging: isolation and characterization of the aspartyl and isoaspartyl homodimers and heterodimers. Biochemistry 1998; 37:2251-62. [PMID: 9485371 DOI: 10.1021/bi972372z] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
During in vitro aging, deamidation of recombinant human stem cell factor produced in Escherichia. coli was detected by HPLC analysis and by the release of soluble ammonia. The deamidation rate is very slow in buffers at low pH or at low temperatures; however, the rate is significantly accelerated in alkaline buffers such as sodium bicarbonate in combination with elevated temperatures. HPLC isolation of various deamidated forms followed by peptide mapping and mass spectrometric analyses revealed that the deamidation involves Asn10 in the sequence -T9NNV- near the N-terminus of the protein. Following peptide mapping analysis, significant amounts of aspartyl and isoaspartyl peptides were identified, indicating the conversion of asparagine into both aspartate and isoaspartate residues. As a result of spontaneous association-dissociation of stem cell factor dimer, a total of five deamidated forms, including two homodimers and three heterodimers, were detected and isolated. Cell proliferation assays showed that two rhSCF heterodimeric species, derived from dimerization between isoaspartyl and other stem cell factor monomers, retain only approximately half of the biological activity. The homodimer with isoaspartic acid in place of Asn10 is 50-fold less potent, while the aspartyl homodimer, either isolated during deamidation experiments or recombinantly prepared by site-directed mutagenesis (e.g., N10D and N10D/N11D variants), exhibits higher activity than the standard molecule. In comparison, synthetic N10A and N10E variants, though missing the deamidation site, are significantly less active. All these variants lacking the Asn10 deamidation site are relatively more stable than those containing the asparagine residue. The results indicate that the biological function and chemical stability of stem cell factor are influenced by the nature of the residue at position 10.
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Affiliation(s)
- Y R Hsu
- Amgen Inc., Amgen Center, 1840 DeHavilland Drive, Thousand Oaks, California 91320, USA
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Hsu YR, Wu GM, Mendiaz EA, Syed R, Wypych J, Toso R, Mann MB, Boone TC, Narhi LO, Lu HS, Langley KE. The majority of stem cell factor exists as monomer under physiological conditions. Implications for dimerization mediating biological activity. J Biol Chem 1997; 272:6406-15. [PMID: 9045664 DOI: 10.1074/jbc.272.10.6406] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Soluble Escherichia coli-derived recombinant human stem cell factor (rhSCF) forms a non-covalently associated dimer. We have determined a dimer association constant (Ka) of 2-4 x 10(8) M-1, using sedimentation equilibrium and size exclusion chromatography. SCF has been shown previously to be present at concentrations of approximately 3.3 ng/ml in human serum. Based on the dimerization Ka, greater than 90% of the circulating SCF would be in the monomeric form. When 125I-rhSCF was added to human serum and the serum analyzed by size exclusion chromatography, 72-49% of rhSCF was monomer when the total SCF concentration was in the range of 10-100 ng/ml, consistent with the Ka determination. Three SCF variants, SCF(F63C), SCF (V49L,F63L), and SCF(A165C), were recombinantly expressed in Escherichia coli, purified, and characterized. The dimer Ka values, biophysical properties, and biological activities of these variants were studied. Dimerization-defective variants SCF(F63C)S-CH2CONH2 and SCF(V49L,F63L) showed substantially reduced mitogenic activity, while the activity of the Cys165-Cys165 disulfide-linked SCF(A165C) dimer was 10-fold higher than that of wild type rhSCF. The results suggest a correlation between dimerization affinity and biological activity, consistent with a model in which SCF dimerization mediates dimerization of its receptor, Kit, and subsequent signal transduction.
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Affiliation(s)
- Y R Hsu
- Amgen Inc., Amgen Center, Thousand Oaks, California 91320, USA
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Sitney KC, Mann MB, Stearns GW, Menjares AD, Stevenson JL, Snavely MD, Fieschko JC, Curless C, Tsai LB. Use of a modified tryptophanase promoter to direct high-level expression of foreign proteins in E. coli. Ann N Y Acad Sci 1996; 782:297-310. [PMID: 8659906 DOI: 10.1111/j.1749-6632.1996.tb40570.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We have modified the tryptophanase promoter (PtnaA) for use as a temperature-independent promoter for the production of recombinant proteins. Although any protein will have a temperature range in which its expression is optimal, we find the tryptophanase promoter functions at all physiologically relevant temperatures (20 degrees C to 42 degrees C). Induction at temperatures below 37 degrees C avoids eliciting the heat-shock response and may favor the production of protein in the soluble state. A short segment of the E. coli tnaA promoter containing the catabolite gene activator protein (CAP) binding site but no tryptophan-responsive elements was used to direct synthesis of various proteins. Conditions for high cell density fermentation and induction control were developed. Expression was induced by depletion of glucose and was maximal when an alternative nonrepressing carbon source was supplied. Expression of certain proteins was tightly controlled; however, pre-induction expression was observed with other reporter genes. The tnaC leader portion of the tnaA promoter was found to reduce pre-induction expression in the presence of glucose, although maximal expression was observed only in the absence of this region. The effect of temperature on expression of several recombinant proteins was investigated. Although some proteins were produced only in inclusion bodies as insoluble material, the production of one protein in soluble form was clearly temperature dependent.
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Affiliation(s)
- K C Sitney
- Microbiology and Applied Microbial Genetics, Amgen Inc., Amgen Center, Thousand Oaks, California 91320, USA
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Lu HS, Chang WC, Mendiaz EA, Mann MB, Langley KE, Hsu YR. Spontaneous dissociation-association of monomers of the human-stem-cell-factor dimer. Biochem J 1995; 305 ( Pt 2):563-8. [PMID: 7530446 PMCID: PMC1136399 DOI: 10.1042/bj3050563] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
In its native state, recombinant human-stem-cell-factor (SCF) dimer can spontaneously and rapidly undergo hybridization when two different SCF dimer species are incubated together. SCF species differing in molecular charge, e.g., a wild-type SCF form and a variant with Asp at position 10 instead of Asn, were used in the hybridization studies; the original species and newly formed dimer hybrid can be separated and quantified by cationic-exchange h.p.l.c. The hybridization reaches an equilibrium where the ratio of hybrid dimer to each of the original species is 2. Kinetic studies of the initial rate of hybridization enable a rate constant for monomer dissociation to be determined. This rate constant is influenced by pH, temperature and salt concentration. The pH and salt effects suggest that salt bridges between charged amino acids at the monomer-monomer interface may be present. From the temperature effects, the activation energy for monomer dissociation was determined to be 85.6 kJ/mol, which is typical for oligomeric proteins. Heavily glycosylated recombinant SCF from Chinese-hamster ovary cells exchanged equally well with the bacterially derived non-glycosylated SCF, indicating that the attached carbohydrate moieties had no effect on monomer exchange.
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Affiliation(s)
- H S Lu
- Amgen Inc., Amgen Center, Thousand Oaks, CA 91320
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Curless CE, Forrer PD, Mann MB, Fenton DM, Tsai LB. Chemostat study of kinetics of human lymphokine synthesis in recombinantEscherichia coli. Biotechnol Bioeng 1989; 34:415-21. [DOI: 10.1002/bit.260340318] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Tsai LB, Lu HS, Kenney WC, Curless CC, Klein ML, Lai PH, Fenton DM, Altrock BW, Mann MB. Control of misincorporation of de novo synthesized norleucine into recombinant interleukin-2 in E. coli. Biochem Biophys Res Commun 1988; 156:733-9. [PMID: 3056402 DOI: 10.1016/s0006-291x(88)80904-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Interleukin-2 produced from a recombinant E. coli was found to contain as much as 19% norleucine in place of methionine in a minimal medium fermentation. Medium supplementation experiments and use of a leucine-requiring mutant host strain indicated the origin of norleucine to be de novo biosynthesis by reactions involving the enzymes of the leucine biosynthetic pathway. The misincorporation was highly suppressed by addition of either L-leucine or L-methionine to the fermentation and completely suppressed by adding both amino acids.
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Affiliation(s)
- L B Tsai
- Amgen, Inc., Thousands Oaks, CA 91320
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Abstract
Two groups of 28 school-age children (divided equally by sex) who were equivalent in terms of chronological age and IQ but differed in the prevalence of motor overflow were given a concept identification task designed to measure relative attentiveness to central, task-related cues and incidental, social environmental ones. Children with a high level of overflow were relatively more responsive to social cues than to task-related ones, while children with a low level were more equally responsive to the two types of cues. The results are interpreted in terms of a relationship between motor overflow and attentional processes.
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Rentschler GJ, Mann MB. The effects of glossectomy on intelligibility of speech and oral perceptual discrimination. J Oral Surg 1980; 38:348-54. [PMID: 6928933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The effects on the intelligibility of speech and oral perceptual ability after glossectomy were studied in 20 patients. The intelligibility, rate of speech, and oral form discrimination ability were measured as they varied by the extent of surgical ablation. The results indicated that speech and oral discrimination ability are more severly impaired in patients who undergo more extensive surgical excision. The rate of speech of most of the patients was slower than normal. The results were interpreted to reflect the value of residual oral tissue. The amount of lingual and adjacent tissue to be excised may be regarded as a rough index of the effect such surgery will have on oral communication.
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Abstract
The genes for a Class II restriction-modification system (HhaII) from Haemophilus haemolyticus have been cloned in Escherichia coli. The vector used for cloning was plasmid pBR322 which confers resistance to tetracycline and ampicillin and contains a single endonuclease R-PstI site, (formula: see text), in the ampicillin gene. The procedure developed by Bolivar et al. (1977) was used to form DNA recombinants. H. haemolyticus DNA was cleaved with PstI endonuclease and poly(dC) extensions were added to the 3'-OH termini using terminal deoxynucleotidyl transferase. Circular pBR322 DNA was cleaved to linear molecules with PstI endonuclease and poly(dG) extensions were added to the 3'-OH termini, thus regenerating the PstI cleavage site sequences. Recombinant molecules, formed by annealing the two DNAs, were used to transfect a restriction and modification-deficient strain of E. coli (HB101 r-m-recA). Tetracycline-resistant clones were tested for acquisition of restriction phenotype (as measured by growth on plates seeded with phage lambdacI-0). A single phage-resistant clone was found. The recombinant plasmid, pD110, isolated from this clone, had acquired 3 kilobases of additional DNA which could be excised with PstI endonuclease. In addition to the restriction function, cells carrying the plasmid expressed the HhaII modification function. Both activities have been partially purified by single-stranded DNA-agarose chromatography. The cloned HhaII restriction activity yields cleavage patterns identical to HinfI. A restriction map of the cloned DNA segment is presented.
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Schneiderman CR, Mann MB. Air flow and intelligibility of speech of normal speakers and speakers with a prosthodontically repaired cleft palate. J Prosthet Dent 1978; 39:193-9. [PMID: 271735 DOI: 10.1016/s0022-3913(78)80021-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Abstract
The methylases M.HaeIII and M.HpaII recognize the tetranucleotide sequences [Formula: see text] and [Formula: see text] respectively, in DNA, and transfer a methyl group from S-adenosylmethionine to the 5-position of cytosine on each strand as indicated by the asterisks. Restriction endonuclease R.HaeIII does not cleave the methylated sequence [Formula: see text] but can cleave [Formula: see text] in which methylation is introduced on the unnatural external cytosine positions. Similarly, R.HpaII does not cleave [Formula: see text] but can cleave [Formula: see text].Images
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Muma JR, Mann MB, Trenholm SA. Training programs in speech pathology and audiology: demographic data, perceived departmental and personal functions, and productivity. ASHA 1976; 18:419-32, 445-6. [PMID: 999755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Huang PC, Mann MB. Comparative fingerprint and composition analysis of the three forms of 32P-labeled phenylalanine tRNA from chloramphenicol-treated Escherichia coli. Biochemistry 1974; 13:4704-10. [PMID: 4609463 DOI: 10.1021/bi00720a004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
MESH Headings
- Acetates
- Base Sequence
- Binding Sites
- Centrifugation, Density Gradient
- Chloramphenicol/pharmacology
- Chromatography, DEAE-Cellulose
- Chromatography, Ion Exchange
- Chromatography, Thin Layer
- Electrophoresis
- Electrophoresis, Paper
- Escherichia coli/drug effects
- Escherichia coli/metabolism
- Nucleic Acid Conformation
- Pancreas/enzymology
- Phenylalanine
- Phosphorus Radioisotopes
- RNA, Bacterial/analysis
- RNA, Bacterial/biosynthesis
- RNA, Bacterial/isolation & purification
- RNA, Transfer/analysis
- RNA, Transfer/biosynthesis
- RNA, Transfer/isolation & purification
- Ribonucleases
- Ribonucleotides
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Shedd DP, Bakamjian VY, Sako K, Schaaf NG, Mann MB. Postlaryngectomy speech rehabilitation by a simplified, single-stage surgical method. Am J Surg 1974; 128:505-11. [PMID: 4421710 DOI: 10.1016/0002-9610(74)90264-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Mann MB, Huang PC. New chromatographic form of phenylalanine transfer ribonucleic acid from Escherichia coli growing exponentially in a low-phosphate medium. J Bacteriol 1974; 118:209-12. [PMID: 4595197 PMCID: PMC246659 DOI: 10.1128/jb.118.1.209-212.1974] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Reversed-phase chromatography has been used to detect the presence of a new form of phenylalanyl-transfer ribonucleic acid (Phe-tRNA) from Escherichia coli growing exponentially in media containing low but nonlimiting levels of inorganic phosphate. The amount of this extra Phe-tRNA form is greatest in slowly growing cells (0.8 generations/h), and becomes negligible in media supporting a rapid growth rate (2.14 generations/h).
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Mann MB, Huang PC. Behavior of chloramphenicol-induced phenylalanine transfer ribonucleic acid during recovery from chloramphenicol treatment in Escherichia coli. Biochemistry 1973; 12:5289-94. [PMID: 4586515 DOI: 10.1021/bi00750a011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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23
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Mann MB. The crisis in mental health. J Med Assoc State Ala 1973; 42:472-3. [PMID: 4686623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Mann MB, Chubrich RC. Binaural stimulation of aphasic patients. Effects on oral reading. N Y State J Med 1970; 70:2815-7. [PMID: 5273368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Abstract
Oral language achievement was studied in 100 matched subjects, half with defective articulation and half with normal speech. The following language scores were derived from the language samples: mean length of response, structural complexity score, mean of the five longest responses, number of different words, type-token ratio, and standard deviation of response length. Only the structural complexity score yielded significant differences between groups.
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