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Curtis LJ, Dooley MD, Lipman EL, Feeny DH. The role of permanent income and family structure in the determination of child health in Canada. Health Econ 2001; 10:287-302. [PMID: 11400252 DOI: 10.1002/hec.591] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We use data from the Ontario Child Health Study (OCHS) to provide the first Canadian estimates of how the empirical association between child health and both low-income and family status (lone-mother versus two-parent) changes when we re-estimate the model with pooled data. Two waves of data provide a better indication of the family's long-run level of economic resources than does one wave. Our measures of health status include categorical indicators and the health utility score derived from the Health Utilities Index Mark 2 (HUI2) system. Consistent with findings from other countries, we find that most outcomes are more strongly related to low-average income (in 1982 and 1986) than to low-current income in either year. Unlike some previous research, we find the quantitative impact of low-income on child health to be modest to large. Lone-mother status is negatively associated with most outcomes, but the lone-mother coefficients did not change significantly when we switched from low-current income to low-average income. This implies that the lone-mother coefficient in single cross-sections is not just a proxy for low-permanent income.
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Affiliation(s)
- L J Curtis
- Department of Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada.
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Abstract
Current opinion of the genetic events driving colorectal tumourigenesis focuses on genomic instability. At least two apparently independent mechanisms are recognized, microsatellite instability and chromosomal instability. The genetic defects underlying each type of instability are only partially understood and controversy remains as to the role of p53 in the generation of chromosomal defects in colorectal cancer. This study sought to clarify the relationships between chromosomal abnormalities and defects of both p53 and mismatch repair. Extensive chromosomal analysis was undertaken, using flow cytometry and comparative genomic hybridization, of a series of sporadic colorectal cancers which had been grown to early passage as subcutaneous xenografts in SCID mice. Overall levels of chromosomal defects were observed to be low in RER+ cancers compared with RER- and distinctive patterns of chromosomal anomalies were found to be associated with both the RER+ and RER- phenotype. No particular level or pattern of chromosomal anomalies appeared to be associated with p53 status, supporting recent observations that abnormal p53 function is not sufficient to cause chromosomal anomalies in colorectal tumours.
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Affiliation(s)
- L J Curtis
- Sir Alastair Currie CRC Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK.
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Georgiades IB, Curtis LJ, Morris RM, Bird CC, Wyllie AH. Heterogeneity studies identify a subset of sporadic colorectal cancers without evidence for chromosomal or microsatellite instability. Oncogene 1999; 18:7933-40. [PMID: 10637503 DOI: 10.1038/sj.onc.1203368] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.7] [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: 11/08/2022]
Abstract
Two apparently independent mechanisms of instability are recognized in colorectal cancer, microsatellite instability and chromosomal instability. Evidence from colorectal cancer cell lines indicates the presence of either, or both, types of instability in the vast majority. Here, we sought to determine the prevalence of such instability in primary sporadic colorectal cancers. Microsatellite instability was established by demonstration of ovel clonal, nongerm-line alleles in at least two of four tested loci. Chromosomal abnormalities were identified by comparative genomic hybridization (CGH) and flow cytometric analysis of nuclear DNA content. Tumours harbouring chromosomal instability were distinguished from those with stable but aneuploid karyotypes by comparing chromosomal defects at multiple sites throughout each cancer. This analysis allowed assessment of both the number of chromosomal abnormalities and their heterogeneity throughout the tumour. The results confirm that microsatellite instability is consistently associated with multiple, repeated changes in microsatellites throughout the growth of the affected colorectal carcinomas. There were also several carcinomas in which major structural or numerical abnormalities in chromosomes had clearly continued to arise during tumour growth. However, a substantial subset of tumours showed neither microsatellite instability nor multiple, major chromosomal abnormalities. We suggest that the development of a proportion of colorectal cancers proceeds via a different pathway of carcinogenesis not associated with either of the currently recognized forms of genomic instability.
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Affiliation(s)
- I B Georgiades
- Sir Alastair Currie CRC Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
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Abstract
BAX gene mutations occur in approximately 50% of RER+ colorectal cancers. To determine the role of these mutations in tumour progression we analysed multiple different tumour sites from RER+ colorectal cancers for BAX mutations. Sixty colorectal carcinomas were analysed for microsatellite instability at loci BAT-26, L-myc, TGF betaRII, D13S160 and D2S123. Twelve out of 60 tumours (20%) were RER+. Forty-five different tumour sites from the 12 RER+ carcinomas were analysed for BAX mutations at the [(G)8] tract in exon 3. Six out of 12 (50%) RER+ tumours showed BAX mutations, four of which showed a homogenous pattern of such mutations detected in all tumour sites. In the other two cases, BAX mutations were present in some but not all tumour sites sampled from the same patient. In contrast, TGF betaRII mutations were found in 9/12 cases (75%) and in each of these were present in all the sampled sites. Two cases showed neither BAX nor TGF betaRII mutation. These data suggest that mutations in TGF betaRII may occur at a very early stage in tumour progression, perhaps in the founder clone. BAX mutations, however, are clearly not necessary for formation of the founder clone and can occur for the first time later in tumour progression.
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Affiliation(s)
- W M Abdel-Rahman
- Sir Alastair Currie CRC Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital
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Curtis LJ. An explicit empirical formula for fine-structure separations of2P0and2D terms for ions in the Cu isoelectronic sequence. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0022-3700/14/4/012] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Curtis LJ, Li Y, Gerbault-Seureau M, Kuick R, Dutrillaux AM, Goubin G, Fawcett J, Cram S, Dutrillaux B, Hanash S, Muleris M. Amplification of DNA sequences from chromosome 19q13.1 in human pancreatic cell lines. Genomics 1998; 53:42-55. [PMID: 9787076 DOI: 10.1006/geno.1998.5405] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [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: 11/22/2022]
Abstract
Conventional cytogenetics and comparative genomic hybridization (CGH) were utilized to identify recurrent chromosomal imbalances in 12 pancreatic adenocarcinoma cell lines. Multiple deletions and gains were observed in all cell lines. Losses affecting chromosomes or chromosome arms 9p, 13, 18q, 8p, 4, and 10p and gains involving chromosome arms or bands 19q13.1, 20q, 5p, 7p, 11q, 3q25-qter, 8q24, and 10q were commonly observed. Interestingly, 19 distinct sites of high-level amplification were found by CGH. Recurrent sites involved 19q13.1 (6 cases), 5p (3 cases), and 12p and 16p (2 cases). Amplification of KRAS2 was demonstrated in 2 cell lines and that of ERBB2 in another. To define the occurrence of chromosome 19 amplification further, two-dimensional analysis of NotI genomic restriction digests and fluorescence in situ hybridization using probes from band 19q13.1 were utilized. High-level amplification of overlapping sets of chromosome 19 NotI fragments was exhibited in 3 cell lines of which 2 showed amplification of both OZF and AKT2 genes and 1 that of AKT2 alone. In these 3 cell lines, amplification of chromosome 19 sequences was associated with the presence of a homogeneously staining region. Our results provide evidence of heterogeneity in the extent of chromosome 19 amplification and suggest the existence of yet unknown amplified genes that may play a role in pancreatic carcinogenesis.
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Affiliation(s)
- L J Curtis
- Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Edinburgh, Scotland
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Abstract
Activating mutations in the Ki-ras2 oncogene are frequently observed in sporadic colorectal adenomas and their incidence is reported to rise in large and tubulovillous adenomas to values close to those in carcinomas. This study shows that this property is a feature of adenomas growing in large bowel that has already demonstrated its propensity to engender malignant tumours: i.e., bowel in which there is a synchronous carcinoma. Adenomas from cancer-free bowel do not share this high incidence of Ki-ras mutations. This difference in mutation incidence between adenomas from cancer-free and cancer-bearing patients does not appear to derive from sampling bias relative to adenoma size, site, or patient age, nor is it found in another gene (APC) known to be of importance in adenoma formation. Large, dysplastic adenomas from cancer-bearing bowel, however, are particularly liable to carry Ki-ras mutations when they arise in patients over 70 years old. The observations suggest that the role of Ki-ras mutations may be more subtle than merely enhancing adenoma growth. Adenoma cells of cancer-prone individuals may suffer more mutational events than those in persons selected as cancer-free.
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Affiliation(s)
- R G Morris
- Sir Alastair Currie CRC Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, UK
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Dunlop MG, Farrington SM, Bubb VJ, Cunningham C, Wright M, Curtis LJ, Butt ZA, Wright E, Fleck BW, Redhead D, Mitchell R, Rainey JB, Macintyre IM, Carter DC, Wyllie AH. Extracolonic features of familial adenomatous polyposis in patients with sporadic colorectal cancer. Br J Cancer 1996; 74:1789-95. [PMID: 8956794 PMCID: PMC2077219 DOI: 10.1038/bjc.1996.631] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
We have investigated the occurrence of attenuated extracolonic manifestations (AEMs) of familial adenomatous polyposis (FAP) in patients with non-polyposis colorectal cancer. In a prospective case-control study, we observed that significantly more colorectal cancer patients exhibited AEM than did age and sex-matched controls (19.5% vs 7.5%, P < 0.004). However patients with AEMs do not have occult FAP, as we found no heterozygous adenomatous polyposis coli (APC) gene mutations despite extensive analysis of constitutional DNA. Genome-wide DNA replication errors (RERs) occur in a proportion of colorectal cancers, particularly right-sided lesions and in almost all tumours from hereditary non-polyposis colorectal cancer (HNPCC) patients. As AEMs have been reported in familial colon cancer cases, we investigated the relationship of AEMs to tumour RER phenotype. There was indeed an excess of AEMs in patients with right-sided tumours (30.2% of 53 patients vs 14.7% of 116 patients, P < 0.03) and in those with RER tumours (3 out of 12 patients with RER tumours vs none out of 21 patients with non-RER tumours, P < 0.05). Two patients with AEM were from HNPCC families compared with none of those without AEM (P < 0.05). The association of AEMs with colorectal cancer is intriguing, and we speculate that it may be a manifestation of mutational mosaicism of the APC gene, perhaps associated with a constitutional defect in DNA mismatch pair.
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Affiliation(s)
- M G Dunlop
- University of Edinburgh, Department of Clinical Surgery, Royal Infirmary, UK
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Huang J, Papadopoulos N, McKinley AJ, Farrington SM, Curtis LJ, Wyllie AH, Zheng S, Willson JK, Markowitz SD, Morin P, Kinzler KW, Vogelstein B, Dunlop MG. APC mutations in colorectal tumors with mismatch repair deficiency. Proc Natl Acad Sci U S A 1996; 93:9049-54. [PMID: 8799152 PMCID: PMC38593 DOI: 10.1073/pnas.93.17.9049] [Citation(s) in RCA: 231] [Impact Index Per Article: 8.3] [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: 02/02/2023] Open
Abstract
We have investigated the influence of genetic instability [replication error (RER) phenotype] on APC (adenomatous polyposis coli), a gene thought to initiate colorectal tumorigenesis. The prevalence of APC mutations was similar in RER and non-RER tumors, indicating that both tumor types share this step in neoplastic transformation. However, in a total of 101 sequenced mutations, we noted a substantial excess of APC frameshift mutations in the RER cases (70% in RER tumors versus 47% in non-RER tumors, P < 0.04). These frameshifts were characteristic of mutations arising in cells deficient in DNA mismatch repair, with a predilection for mononucleotide repeats in the RER tumors (P < 0.0002), particularly (A)n tracts (P < 0.00007). These findings suggest that the genetic instability that is reflected by the RER phenotype precedes, and is responsible for, APC mutation in RER large bowel tumors and have important implications for understanding the very earliest stages of neoplasia in patients with tumors deficient in mismatch repair.
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Affiliation(s)
- J Huang
- University of Edinburgh, Department of Surgery, Royal Infirmary, United Kingdom
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Bubb VJ, Curtis LJ, Cunningham C, Dunlop MG, Carothers AD, Morris RG, White S, Bird CC, Wyllie AH. Microsatellite instability and the role of hMSH2 in sporadic colorectalcancer. Oncogene 1996; 12:2641-9. [PMID: 8700523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Microsatellite instability (MSI) occurs in most tumours from patients with hereditary non-polyposis colorectal cancer (HNPCC) and in around 17% of sporadic colorectal cancers. Germline defects in mismatch repair (MMR) genes are responsible for the majority of large HNPCC families, with hMSH2 accounting for at least 50%. MMR gene defects also occur in a small proportion of sporadic colorectal tumours with MSI. Here we report a systematic analysis of mismatch repair deficiency in 215 Scottish patients with sporadic colorectal tumours. We found that 16.4% of tumours exhibited MSI; survival analysis by Cox proportional hazards method showed a substantial survival advantage for patients with tumours showing MSI, independent of other prognostic factors. Tumours with MSI were screened for hMSH2 mutations and although 61% were found to have alterations, of these only 1/24 was exonic. The majority of these changes were reductions in length at intronic mononucleotide tracts and we postulate that these alterations are the result of a genetic defect elsewhere, although they may compromise hMSH2 function as a second step in tumourigenesis. Our findings indicate that instability confers an improved prognosis in colorectal cancer and, despite the fact that these two groups of tumours share similar biological characteristics, the genetic basis of HNPCC and sporadic colorectal cancer with MSI is different.
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Affiliation(s)
- V J Bubb
- CRC Laboratories, Department of Pathology, University Medical School, Edinburgh, UK
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Theodosiou CE, Curtis LJ, Nicolaides CA. Determination of dipole polarizabilities for Mg+ and Ca+ ions from precision lifetime measurements and transition-moment cancellations. Phys Rev A 1995; 52:3677-3680. [PMID: 9912670 DOI: 10.1103/physreva.52.3677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Curtis LJ, Maniak ST, Ghrist RW, Irving RE, Ellis DG, Henderson M, Kacher MH, Träbert E, Granzow J, Bengtsson P, Engström L. Measurements and data-based predictions for Delta n=1 resonance and intercombination transitions in the Be and Ne sequences. Phys Rev A 1995; 51:4575-4582. [PMID: 9912146 DOI: 10.1103/physreva.51.4575] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Kukla KW, Livingston AE, Suleiman J, Berry HG, Dunford RW, Gemmell DS, Kanter EP, Cheng S, Curtis LJ. Fine-structure energies for the 1s2s 3S-1s2p 3P transition in heliumlike Ar16+. Phys Rev A 1995; 51:1905-1917. [PMID: 9911800 DOI: 10.1103/physreva.51.1905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Curtis LJ, Ellis DG, Martinson I. Data-based predictions of line strengths in alkali-metal-like isoelectronic sequences. Phys Rev A 1995; 51:251-256. [PMID: 9911580 DOI: 10.1103/physreva.51.251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Cripps KJ, Curtis LJ, Wyllie AH. Mutational analysis of the MCC gene by single-strand conformational polymorphism analysis. Eur J Cancer 1995; 31A:853-5. [PMID: 7640085 DOI: 10.1016/0959-8049(94)00517-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Cheng S, Dunford RW, Liu CJ, Zabransky BJ, Livingston AE, Curtis LJ. M1 decay of the 2 (3)S1 state in heliumlike krypton. Phys Rev A 1994; 49:2347-2353. [PMID: 9910504 DOI: 10.1103/physreva.49.2347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Curtis LJ, Bubb VJ, Gledhill S, Morris RG, Bird CC, Wyllie AH. Loss of heterozygosity of MCC is not associated with mutation of the retained allele in sporadic colorectal cancer. Hum Mol Genet 1994; 3:443-6. [PMID: 8012355 DOI: 10.1093/hmg/3.3.443] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [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: 01/28/2023] Open
Abstract
The adenomatous polyposis coli (APC) gene, which transmits familial adenomatous polyposis, is frequently mutated in sporadic colorectal tumours. Acquired somatic mutations have also been reported in a second gene, mutated in colorectal cancer (MCC), which lies within 500 kb of APC on chromosome 5q21 and has thus been implicated in tumour development. Further evidence for an oncosuppressor gene other than APC on chromosome 5q comes from recent studies of lung, renal and hepatic cancers in which there is loss of heterozygosity of 5q21 but no somatic APC mutations. To investigate the relative importance of APC and MCC in sporadic colorectal cancer, we have assessed the extent of 5q21 allelic loss in 80 carcinomas. All informative tumours exhibiting allelic loss had deletions which included both APC and MCC. In 21 tumours with loss of heterozygosity in MCC we have screened the entire coding region of the gene for mutation of the retained allele and found no evidence for mutation. The data indicate that independent loss of MCC is a rare event, and that in cases where allele loss occurs mutation of the retained allele is uncommon. This suggests that MCC does not function as an independent tumour suppressor in the majority of colorectal cancers.
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Affiliation(s)
- L J Curtis
- Department of Pathology, University Medical School, Edinburgh, UK
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Dunford RW, Berry HG, Church DA, Hass M, Liu CJ, Raphaelian ML, Zabransky BJ, Curtis LJ, Livingston AE. Forbidden transitions in one- and two-electron nickel. Phys Rev A 1993; 48:2729-2745. [PMID: 9909922 DOI: 10.1103/physreva.48.2729] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Dunford RW, Berry HG, Cheng S, Kanter EP, Kurtz C, Zabransky BJ, Livingston AE, Curtis LJ. Two-photon decay of the 2 (1)S0 state in He-like bromine. Phys Rev A 1993; 48:1929-1936. [PMID: 9909809 DOI: 10.1103/physreva.48.1929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Träbert E, Suleiman J, Cheng S, Berry HG, Dunford RW, Kanter EP, Kurtz C, Livingston AE, Kukla KW, Serpa FG, Curtis LJ. Experimental transition probabilities of intercombination transitions in Mg-like and Al-like ions of bromine. Phys Rev A 1993; 47:3805-3809. [PMID: 9909387 DOI: 10.1103/physreva.47.3805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Cheng S, Berry HG, Dunford RW, Gemmell DS, Kanter EP, Zabransky BJ, Livingston AE, Curtis LJ, Bailey J, Nolen JA. Branching ratio for the M1 decay of the 2 (2)S1/2 state in one-electron krypton. Phys Rev A 1993; 47:903-910. [PMID: 9909009 DOI: 10.1103/physreva.47.903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Beideck DJ, Curtis LJ, Irving RE, Maniak ST, Hellborg R, Johansson SG, Joueizadeh AA, Martinson I, Brage T. Lifetimes of 5d96p and 5d86s6p levels in Hg III. Phys Rev A 1993; 47:884-889. [PMID: 9909006 DOI: 10.1103/physreva.47.884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Westerlind M, Engström L, Bengtsson P, Curtis LJ. Experimental lifetimes of the 2p53s 1P1 and 3P1 levels in Ne-like sulfur and chlorine. Phys Rev A 1992; 45:6198-6201. [PMID: 9907738 DOI: 10.1103/physreva.45.6198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Livingston AE, Serpa FG, Zacarias AS, Curtis LJ, Berry HG, Blundell SA. Lifetime measurements in highly ionized silicon. Phys Rev A 1991; 44:7820-7822. [PMID: 9905919 DOI: 10.1103/physreva.44.7820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Dunford RW, Liu CJ, Last J, Berrah-Mansour N, Vondrasek R, Church DA, Curtis LJ. Direct observation of hyperfine quenching of the 2 (3)P0 level in heliumlike nickel. Phys Rev A 1991; 44:764-767. [PMID: 9905729 DOI: 10.1103/physreva.44.764] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Curtis LJ, Rudzikas ZB, Ellis DG. Empirical determination of intermediate-coupling amplitudes and transition rates from spectroscopic data. Phys Rev A 1991; 44:776-779. [PMID: 9905732 DOI: 10.1103/physreva.44.776] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Curtis LJ. Classical mnemonic approach for obtaining hydrogenic expectation values of rP. Phys Rev A 1991; 43:568-569. [PMID: 9904812 DOI: 10.1103/physreva.43.568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Maniak ST, Curtis LJ. Labeling conventions in isoelectronic sequences. Phys Rev A 1990; 42:1821-1823. [PMID: 9904224 DOI: 10.1103/physreva.42.1821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Dunford RW, Church DA, Liu CJ, Berry HG, Raphaelian ML, Hass M, Curtis LJ. Lifetime of the 2(3)S1 state of heliumlike 79Br33+. Phys Rev A 1990; 41:4109-4111. [PMID: 9903600 DOI: 10.1103/physreva.41.4109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Curtis LJ. Semiempirical specification of singlet-triplet mixing angles, oscillator strengths, and g factors in nsn'l, nsn'p5, np2, and np4 configurations. Phys Rev A Gen Phys 1989; 40:6958-6968. [PMID: 9902107 DOI: 10.1103/physreva.40.6958] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Dunford RW, Hass M, Bakke E, Berry HG, Liu CJ, Raphaelian ML, Curtis LJ. Lifetimes of two-photon-emitting states in heliumlike and hydrogenlike nickel. Phys Rev Lett 1989; 62:2809-2812. [PMID: 10040097 DOI: 10.1103/physrevlett.62.2809] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Curtis LJ, Theodosiou CE. Comprehensive calculations of 4p and 4d lifetimes for the Cu sequence. Phys Rev A Gen Phys 1989; 39:605-615. [PMID: 9901288 DOI: 10.1103/physreva.39.605] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Dunford RW, Berry HG, Groeneveld KO, Hass M, Bakke E, Raphaelian ML, Livingston AE, Curtis LJ. Lifetime of the 2(1)S0 state of heliumlike Ni26+. Phys Rev A Gen Phys 1988; 38:5423-5425. [PMID: 9900269 DOI: 10.1103/physreva.38.5423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Curtis LJ. Fine-structure intervals for the lowest P terms in the Cu, Zn, Ga, and Br isoelectronic sequences for Z <= 92. Phys Rev A Gen Phys 1987; 35:2089-2094. [PMID: 9898383 DOI: 10.1103/physreva.35.2089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Astner G, Curtis LJ, Liljeby L, Mannervik S, Martinson I. A high precision beam-foil meanlife measurement of the 1s 3p 1 P level in He I. ACTA ACUST UNITED AC 1976. [DOI: 10.1007/bf01409083] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Curtis LJ. Convolution of a time-dependent driven excitation into the decay curve of an arbitrarily cascaded and blended level. ACTA ACUST UNITED AC 1974. [DOI: 10.1364/josa.64.000495] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kohl JL, Curtis LJ, Chojnacki DA, Schectman RM. A convenient technique for determining the relative quantum efficiency of a monochromator and detector system. Appl Opt 1971; 10:34-37. [PMID: 20094386 DOI: 10.1364/ao.10.000034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A technique is described for determining the relative efficiency with wavelength of a monochromator and detector system using single photon detection. The method described utilizes a commercially available standard of spectral irradiance and provides a convenient, straightforward, and accurate technique for making the calibration, which is applicable over large ranges of wavelength and detector sensitivity. The calibration procedure has been designed to fill a need in atomic spectroscopy for a convenient method of determining the relative intensities of spectral lines in measurements which require single photon detection.
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