151
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Belohoubek E, Denlinger E, Kalokitis D, Fathy A, Paglione R, Pendrik V, Brown J, Piqu� A, Wu XD, Green SM, Mathews S, Edwards R, Mathur M, Venkatesan T. Advanced High-temperature superconducting components for microwave systems. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf00618143] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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152
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Yager D, Yuan R, Mathews S. What is the utility of the psychophysical 'light scattering factor'? Invest Ophthalmol Vis Sci 1992; 33:688-90. [PMID: 1544793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
It has been suggested by Sjöstrand and his colleagues that an index of scatter by the ocular media may be derived from contrast sensitivity measured with and without a glare source. This index was tested under different conditions of stimulus luminance and found not to be constant and thus to not reflect a property of the media.
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153
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Furfaro S, Gauthier M, Lacroix J, Nadeau D, Lafleur L, Mathews S. Arterial catheter-related infections in children. A 1-year cohort analysis. AMERICAN JOURNAL OF DISEASES OF CHILDREN (1960) 1991; 145:1037-43. [PMID: 1877564 DOI: 10.1001/archpedi.1991.02160090089031] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To determine the incidence of infection secondary to arterial catheterization in children as well as the risk markers, we prospectively evaluated, during a 1-year period, all arterial catheters installed in children admitted to the pediatric intensive care unit. A total of 340 cannulas were placed in 310 children aged 80 +/- 4 months (mean +/- SEM) for a period of 64 +/- 4 hours. Most catheters were inserted percutaneously (99%) in the radial artery (86.5%). Ninety-two percent (313/340) of the catheters were sterile (group 1), 5% (17/340) were contaminated (less than 10 colony-forming units on semiquantitative culture) (group 2), and 3% (10/340) were considered either locally infected (ie, greater than or equal to 10 colony-forming units) (eight of 10) or associated with a possible catheter-related sepsis (two of 10) (group 3, or infected group). The incidence of local inflammation at the insertion site was higher in group 2 than in group 1 (18% vs 2.9%) but not statistically different between groups 3 and 1 (10% vs 2.9%). The duration of arterial catheterization was longer in group 3 than in group 1 (125 +/- 31 vs 61 +/- 4 hours). The risk of infection was nonexistent in the first 48 hours of catheterization. Thereafter it was calculated as being 6.2% (10/161), but it correlated poorly with the duration of arterial catheterization. These results confirm the very low incidence of infection related to arterial catheterization in children. Thus, routine catheter reinsertion is, in our opinion, unjustified.
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154
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Bonadio WA, Smith DS, Mathews S, Rock A. Clinical significance of newly documented neutropenia in febrile young infants evaluated for sepsis. Pediatr Infect Dis J 1991; 10:407-8. [PMID: 2067892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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155
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Mathews S. Europe's top women--what skills are needed in the next decade? HEALTH MANPOWER MANAGEMENT 1991; 16:8-10. [PMID: 10111387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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156
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157
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Guay J, Reinberg C, Rivard GE, Poitras B, Mathews S, David M. DDAVP does not reduce bleeding during spinal fusion for idiopathic scoliosis. Can J Anaesth 1990; 37:S14. [PMID: 2193735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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158
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Duncan JL, Ferguson AM, Mathews S. Vibrational anharmonicity in CH3I: A joint local and normal mode study. J Chem Phys 1989. [DOI: 10.1063/1.457131] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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159
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O'Keiff H, Street D, Mathews S. Home care at a top-ten teaching hospital. Barnes Hospital, St. Louis, Missouri. CARING : NATIONAL ASSOCIATION FOR HOME CARE MAGAZINE 1989; 8:38-42. [PMID: 10294297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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160
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Fischer R, Koller M, Flura M, Mathews S, Strehler-Page MA, Krebs J, Penniston JT, Carafoli E, Strehler EE. Multiple divergent mRNAs code for a single human calmodulin. J Biol Chem 1988; 263:17055-62. [PMID: 3182832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The isolation of a novel complementary DNA (cDNA) clone coding for human calmodulin (CaM) is reported. Although it encodes a protein indistinguishable from the only known higher vertebrate calmodulin, its nucleotide sequence varies extensively from that of two previously reported human CaM cDNAs (Wawrzynczak and Perham, 1984; SenGupta et al., 1987). Only 82 and 81% identity, respectively, is found between the newly isolated and the two known human mRNAs in their coding regions. No striking homology is present in their noncoding regions. Codon usage in the three CaM mRNAs is also surprisingly divergent. A 2.3-kilobase mRNA corresponding to the newly isolated clone is expressed to varying extents in several human tissues, together with an approximately 0.8-kilobase mRNA species presumably arising from alternative polyadenylation of the same primary transcript. The results indicate that the human genome contains at least three divergent CaM genes that are under selective pressure to encode an identical protein while maintaining maximally divergent nucleotide sequences. Partial characterization of a genomic clone specifying the 3' portion of the newly identified CaM mRNA shows that this gene contains introns at identical positions as the previously characterized bona fide vertebrate CaM genes. Evolutionary implications of the presence of a CaM multigene family are discussed.
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161
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Fischer R, Koller M, Flura M, Mathews S, Strehler-Page MA, Krebs J, Penniston JT, Carafoli E, Strehler EE. Multiple divergent mRNAs code for a single human calmodulin. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)37497-0] [Citation(s) in RCA: 174] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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162
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Verma AK, Filoteo AG, Stanford DR, Wieben ED, Penniston JT, Strehler EE, Fischer R, Heim R, Vogel G, Mathews S. Complete primary structure of a human plasma membrane Ca2+ pump. J Biol Chem 1988; 263:14152-9. [PMID: 2844759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
cDNAs coding for a plasma membrane Ca2+ pump were isolated from a human teratoma library and sequenced. The translated sequence contained 1,220 amino acids with a calculated molecular weight of 134,683. All regions of functional importance known from other ion-transporting ATPases could be identified. The translated sequence also contained, near the carboxyl terminus, the calmodulin-binding domain and two domains which are very rich in glutamic acid and aspartic acid. These two domains resemble calmodulin somewhat and one of them may play a role in the binding of Ca2+. The enzyme also contains domains rich in serine and threonine, one of which has a sequence matching those of good cAMP-dependent protein kinase substrates. The carboxyl-terminal region is important for regulation by calmodulin, proteolysis, and phosphorylation. Near the amino terminus are two domains which are very rich in lysine and glutamic acid, as well as two domains resembling EF hands, one of which also has some resemblance to calmodulin. Comparison of the cloned sequence with peptide sequences from the erythrocyte Ca2+ pump showed that the two proteins have a very high proportion of identical residues but are not 100% identical, indicating that they represent different isozymes.
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163
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Séquier JM, Richards JG, Malherbe P, Price GW, Mathews S, Möhler H. Mapping of brain areas containing RNA homologous to cDNAs encoding the alpha and beta subunits of the rat GABAA gamma-aminobutyrate receptor. Proc Natl Acad Sci U S A 1988; 85:7815-9. [PMID: 2845424 PMCID: PMC282284 DOI: 10.1073/pnas.85.20.7815] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
An in situ hybridization technique was used to determine the distribution in rat brain of RNA homologous to cDNA clones encoding the alpha and beta subunits of the rat brain GABAA gamma-aminobutyrate receptor. The subunit proteins were mapped in adjacent sections autoradiographically and immunohistochemically. Many brain areas containing high densities of GABAA receptors showed strong hybridization signals with both the alpha- and the beta-subunit antisense RNA probe--e.g., cerebral cortex, hippocampus, and cerebellum. On a cellular level, a dense dendritic localization of GABAA receptors was correlated with a strong hybridization in the corresponding somata--e.g., in mitral cells of the olfactory bulb, pyramidal cells of hippocampus, granule cells of the dentate gyrus, and Purkinje and granule cells of the cerebellum. In some brain areas--e.g., substantia nigra--the intensity of the hybridization signal with the beta-subunit probe was much weaker than that with the alpha-subunit probe, whereas the inverse ratio of hybridization intensity was found in others--e.g., in bed nucleus. This regional heterogeneity in the hybridization pattern may reflect regional differences in RNA stability, transcription rate, or subunit composition. The results open the way for studies on the regulation of GABAA-receptor gene expression in normal and pathological brain in situ.
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164
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Solioz M, Mathews S, Fürst P. Cloning of the K+-ATPase of Streptococcus faecalis. Structural and evolutionary implications of its homology to the KdpB-protein of Escherichia coli. J Biol Chem 1987; 262:7358-62. [PMID: 2953719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The K+-ATPase of Streptococcus faecalis consists of a single polypeptide component of relative Mr = 78,000 and serves as an ATP-driven pump for the accumulation of potassium by the bacterial cell. The gene encoding this ATPase was isolated by immunological screening of an S. faecalis genomic library in the Escherichia coli/pUC8 host/vector system. Two independently derived clones express the full-size ATPase polypeptide. Transcription and translation of the cloned DNA apparently proceed by means of the respective S. faecalis signals. DNA sequencing revealed a gene encoding a protein of 583 amino acids and a calculated Mr of 63,070. This protein exhibits in its primary structure regions of homology with the KdpB-subunit of the K+-ATPase of E. coli and, to a lesser extent, with eukaryotic ion-motive ATPases. The hydropathy profiles and secondary structure predictions, respectively, for the S. faecalis ATPase and the E. coli KdpB-protein show striking similarity. Even regions with low homology in the amino acid sequence exhibit structural features that have clearly been conserved in the two proteins. This points to a fundamental role of these domains in the structure and/or function of these transport ATPases.
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165
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Mathews S, Yager D, Ciuffreda KJ, Ettinger ER. Spatial frequency discrimination in anisometropic and strabismic amblyopia. APPLIED OPTICS 1987; 26:1432-1436. [PMID: 20454338 DOI: 10.1364/ao.26.001432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Spatial-frequency difference thresholds were measured in amblyopes over a wide range of spatial frequencies using a two-alternative forced-choice technique. Four amblyopes, three of whom were anisometropic, exhibited a higher threshold for discrimination at most frequencies in their amblyopic eye. In contrast, three other amblyopes, all of whom were strabismic, exhibited regions of normal discrimination alternating with regions of higher thresholds than found in their dominant eye. These results are discussed in terms of a multiple-spatial-frequency channel model. They suggest that there are different underlying mechanisms for the deficits in the two types of amblyopia: the anisometropic pattern may reflect a failure of normal development of spatial-frequency channels; the strabismic pattern is similar to that shown in the periphery of the retina by normal subjects and may reflect nonfoveal-type function.
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166
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Bechmann H, Haid A, Schweyen RJ, Mathews S, Kaudewitz F. Expression of the "split gene" COB in yeast mtDNA. Translation of intervening sequences in mutant strains. J Biol Chem 1981; 256:3525-31. [PMID: 7009613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
This study deals with the effects that mutations in the COB region of yeast mtDNA have on the expression of mitochondrially made polypeptides. Based on the detection of two series of polypeptide chain-terminating mutations, we conclude that two proteins are specified by this region, apocytochrome b (Mr = 30,000) and a polypeptide of Mr = 42,000. One series of mutations generates new polypeptides ranging in size from 8,000 to 29,000 daltons; all of them are precipitated by serum direct against apocytochrome b. These mutations are located in five distinct segments of the COB region, the sequences alpha to epsilon coding for apocytochrome b. The second series of mutations, generating new polypeptides ranging in size from 17,000 to 41,000 daltons, is located within the first intervening sequence (alpha/beta) of the split gene for apocytochrome b. These mutations cause premature chain termination in the COOH-terminal part of a 42,000-dalton polypeptide. Its NH2-terminal part is likely to be specified by sequence alpha and thus to be homologous to that of apocytochrome b. We conclude that the 42,000-dalton polypeptide is translated on a processing intermediate of th COB transcript by reading through sequence alpha into sequence alpha/beta. We discuss the hypothesis that this polypeptide has a function in the expression of the COB region, possibly at the level of transcript processing.
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167
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Bechmann H, Haid A, Schweyen R, Mathews S, Kaudewitz F. Expression of the “split gene” COB in yeast mtDNA. Translation of intervening sequences in mutant strains. J Biol Chem 1981. [DOI: 10.1016/s0021-9258(19)69640-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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