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Ng J, Egedal J, Le A, Daughton W, Chen LJ. Kinetic structure of the electron diffusion region in antiparallel magnetic reconnection. PHYSICAL REVIEW LETTERS 2011; 106:065002. [PMID: 21405472 DOI: 10.1103/physrevlett.106.065002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Indexed: 05/30/2023]
Abstract
Strong electron pressure anisotropy has been observed upstream of electron diffusion regions during reconnection in Earth's magnetotail and kinetic simulations. For collisionless antiparallel reconnection, we find that the anisotropy drives the electron current in the electron diffusion region, and that this current is insensitive to the reconnection electric field. Reconstruction of the electron distribution function within this region at enhanced resolutions reveals its highly structured nature and the mechanism by which the pressure anisotropy sets the structure of the region.
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128
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Shah DN, Wilson CM, Ying GS, Karp KA, Cocker KD, Ng J, Schulenburg E, Fielder AR, Mills MD, Quinn GE. Comparison of expert graders to computer-assisted image analysis of the retina in retinopathy of prematurity. Br J Ophthalmol 2011; 95:1442-5. [DOI: 10.1136/bjo.2010.185363] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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129
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Zanguee N, Lymbery J, Lau J, Suzuki A, Yang R, Ng J, Ryan U. Identification of novel Cryptosporidium species in aquarium fish. Vet Parasitol 2010; 174:43-8. [DOI: 10.1016/j.vetpar.2010.08.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 07/29/2010] [Accepted: 08/10/2010] [Indexed: 11/27/2022]
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130
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Hoover S, Nam J, Gorham PW, Grashorn E, Allison P, Barwick SW, Beatty JJ, Belov K, Besson DZ, Binns WR, Chen C, Chen P, Clem JM, Connolly A, Dowkontt PF, DuVernois MA, Field RC, Goldstein D, Vieregg AG, Hast C, Israel MH, Javaid A, Kowalski J, Learned JG, Liewer KM, Link JT, Lusczek E, Matsuno S, Mercurio BC, Miki C, Miočinović P, Naudet CJ, Ng J, Nichol RJ, Palladino K, Reil K, Romero-Wolf A, Rosen M, Ruckman L, Saltzberg D, Seckel D, Varner GS, Walz D, Wu F. Observation of ultrahigh-energy cosmic rays with the ANITA balloon-borne radio interferometer. PHYSICAL REVIEW LETTERS 2010; 105:151101. [PMID: 21230887 DOI: 10.1103/physrevlett.105.151101] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Indexed: 05/30/2023]
Abstract
We report the observation of 16 cosmic ray events with a mean energy of 1.5 × 10¹⁹ eV via radio pulses originating from the interaction of the cosmic ray air shower with the Antarctic geomagnetic field, a process known as geosynchrotron emission. We present measurements in the 300-900 MHz range, which are the first self-triggered, first ultrawide band, first far-field, and the highest energy sample of cosmic ray events collected with the radio technique. Their properties are inconsistent with current ground-based geosynchrotron models. The emission is 100% polarized in the plane perpendicular to the projected geomagnetic field. Fourteen events are seen to have a phase inversion due to reflection of the radio beam off the ice surface, and two additional events are seen directly from above the horizon. Based on a likelihood analysis, we estimate angular pointing precision of order 2° for the event arrival directions.
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Lazaro AM, Xiao Y, Masaberg C, Tu B, Ng J, Hurley CK, Posch PE. Seventy-eight novel HLA class I and II alleles identified during routine registry typing in 2008 and 2009. ACTA ACUST UNITED AC 2010; 77:54-61. [DOI: 10.1111/j.1399-0039.2010.01558.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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132
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Meuleners L, Hendrie D, Ng J, Semmens J. The effectiveness and cost-savings of first eye cataract surgery in reducing crash risk: a population based study. Inj Prev 2010. [DOI: 10.1136/ip.2010.029215.200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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133
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Lazaro AM, Xiao Y, Regenscheid A, Ng J, Hurley CK, Posch PE. Sixty-five novel alleles at the HLA-A, -B, and -DRB1 loci identified from National Marrow Donor Program volunteer donors. ACTA ACUST UNITED AC 2010; 76:319-24. [DOI: 10.1111/j.1399-0039.2010.01524.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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134
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Laughlin RB, Ng J, Guard HE. Hormesis: a response to low environmental concentrations of petroleum hydrocarbons. Science 2010; 211:705-7. [PMID: 17776652 DOI: 10.1126/science.211.4483.705] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Crab zoeae (Rhithropanopeus harrisii) were exposed to water-soluble fractions of jet fuel (JP5) for the first 5 days or for the duration of zoeal development (11 to 14 days). Short-term exposure or continuous exposure to low concentrations of petroleum hydrocarbons caused no increase in mortality or changes in development rate, and increased megalopal weight was characteristic of such groups. This phenomenon, termed "hormesis," is probably a generalized aspect of environmental stress etiology but has seldom been reported as such.
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135
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Chew L, Si EH, Ng J, Yap R, Koo KN, Shih V, Poon D. Knowledge of prescription medications among elderly cancer patients. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e19548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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136
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Jiang B, Hou L, Chen M, Ng J, Hurley CK. The profile of KIR3DL1 and KIR3DS1 alleles in an African American population resembles that found in African populations. ACTA ACUST UNITED AC 2010; 76:64-6. [PMID: 20230527 DOI: 10.1111/j.1399-0039.2010.01468.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
KIR3DL1 and KIR3DS1 allele frequencies were determined by DNA sequencing of the complete coding regions from 100 random unrelated African Americans. Alleles 3DL1*01501 (29 individuals) and 3DL1*01502 (23 individuals) were most frequently observed in addition to 21 other known alleles and 7 new alleles: KIR3DL1*01503, *03102, *064, *065, *066, *067, and *068. Two of the new alleles (KIR3DL1*064, *065) created additional variants of the chimeric KIR3DL1/KIR3DL2 gene. KIR3DS1*01301 (94% of the gene positive individuals) and KIR3DS1*049N (11%) were identified in the 18 individuals carrying this gene. Three individuals appeared to carry a killer cell immunoglobulin-like receptor haplotype with KIR3DL1/S1 duplication. The profile of alleles resembles that found in African populations but also shows signs of admixture.
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Hou L, Chen M, Jiang B, Ng J, Hurley CK. African Americans exhibit a predominant allele in the midst of extensive KIR2DL1 allelic diversity. ACTA ACUST UNITED AC 2010; 76:31-4. [PMID: 20210923 DOI: 10.1111/j.1399-0039.2010.01460.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
KIR2DL1 alleles were identified by DNA sequencing of the coding region from amplified genomic DNA from 100 random African Americans. The majority of individuals (97%) carried a KIR2DL1 locus. Allele KIR2DL1*00302 was found in 68% of individuals but KIR2DL1*00401, *002, *00303, *006, and *007 were also frequent. Eleven new alleles were described: KIR2DL1*00403, *01101, *01102, *012, *013N, *014, *015, *016, *017, *018, and *019. Nine of the novel alleles encoded amino acid substitutions located throughout the receptor; one allele carried a stop codon in the exon encoding the first extracellular domain.
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138
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Budde K, Sommerer C, Becker T, Asderakis A, Pietruck F, Grinyo JM, Rigotti P, Dantal J, Ng J, Barten MJ, Weber M. Sotrastaurin, a novel small molecule inhibiting protein kinase C: first clinical results in renal-transplant recipients. Am J Transplant 2010; 10:571-81. [PMID: 20121745 DOI: 10.1111/j.1600-6143.2009.02980.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Sotrastaurin, a novel protein-kinase-C inhibitor, blocks early T-cell activation. In this 12-month, Phase II study, de novo renal-transplant patients were randomized to sotrastaurin (200 mg b.i.d.) + standard-exposure tacrolimus (SET) or reduced-exposure tacrolimus (RET) (SET: n = 76; RET: n = 66), or control (SET + mycophenolic acid [MPA, 720 mg b.i.d.]; n = 74). In both sotrastaurin groups, patients were converted from tacrolimus to MPA after Month 3, achieving calcineurin inhibitor-free immunosuppression. The primary endpoint was composite efficacy failure (treated biopsy-proven acute rejection, graft loss, death or loss to follow-up). The key secondary endpoint was glomerular filtration rate (GFR). Composite efficacy failure rates were: 4.1%, 5.4% and 1.5% at Month 3 (preconversion) and 7.8%, 44.8% and 34.1% at study end in the control, sotrastaurin + SET and sotrastaurin + RET groups, respectively; these results led to premature study discontinuation. Median GFR at Month 6 was: 57.0, 53.0 and 60.0 mL/min/1.73 m(2), respectively. Study-drug discontinuations due to adverse events occurred in 16.2%, 18.4% and 12.1%, respectively. Leukopenia and neutropenia occurred more frequently preconversion in control versus sotrastaurin groups: 13.7%, 5.6%, and 4.6%; and 11.1%, 4.3% and 3.1%, respectively. The initial sotrastaurin + tacrolimus regimen was efficacious and well tolerated but the postconversion sotrastaurin + MPA regimen showed inadequate efficacy. Longer-term evaluation of sotrastaurin + tacrolimus is warranted.
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139
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Ng J, Rashid AJ, So CH, O'Dowd BF, George SR. Activation of calcium/calmodulin-dependent protein kinase IIalpha in the striatum by the heteromeric D1-D2 dopamine receptor complex. Neuroscience 2010; 165:535-41. [PMID: 19837142 DOI: 10.1016/j.neuroscience.2009.10.017] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2009] [Revised: 09/18/2009] [Accepted: 10/11/2009] [Indexed: 11/15/2022]
Abstract
Synaptic plasticity in the striatum is a key mechanism that underlies processes such as reward related incentive learning and behavioral habit formation resulting from drugs of abuse. Key aspects of these functions are dependent on dopamine transmission as well as activation of calcium/calmodulin-dependent protein kinase IIalpha (CaMKIIalpha). In this study, we examined the ability of a recently identified heteromeric complex composed of D1 and D2 dopamine receptors coupled to Gq/11 to activate striatal CaMKIIalpha. Using the dopaminergic agonist SKF83959, which selectively activates the D1-D2 complex, we demonstrated phosphorylation of CaMKIIalpha at threonine 286, both in heterologous cells and in the murine striatum in vivo. Phosphorylation of CaMKIIalpha by activation of the receptor complex required concurrent agonism of both D1 and D2 receptors and was independent of receptor pathways that modulated adenylyl cyclase. The identification of this novel mechanism by which dopamine may modulate synaptic plasticity has implications for our understanding of striatal-mediated reward and motor function, as well as neuronal disorders in which striatal dopaminergic neurotransmission is involved.
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140
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Oliveira DCSG, Hunter WB, Ng J, Desjardins CA, Dang PM, Werren JH. Data mining cDNAs reveals three new single stranded RNA viruses in Nasonia (Hymenoptera: Pteromalidae). INSECT MOLECULAR BIOLOGY 2010; 19 Suppl 1:99-107. [PMID: 20167021 PMCID: PMC2872476 DOI: 10.1111/j.1365-2583.2009.00934.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
We report three novel small RNA viruses uncovered from cDNA libraries from parasitoid wasps in the genus Nasonia. The genome of this kind of virus is a positive-sense single-stranded RNA with a 3' poly(A), which facilitates cloning from cDNAs. Two of the viruses, NvitV-1 and NvitV-2, possess a RNA-dependent RNA polymerase that associates them with the family Iflaviridae of the order Picornavirales. A third virus, NvitV-3, is most similar to the Nora virus from Drosophila. A reverse transcription-PCR method developed for NvitV-1 indicates that it is a persistent commensal infection of Nasonia.
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141
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Choo S, Perry H, Hesse A, Abantanga F, Sory E, Cherian M, Chang D, Osen H, Ng J, McCord C, Abdullah F. Assessment of Emergency and Essential Surgical Providers at the District Hospital in Ghana. J Surg Res 2010. [DOI: 10.1016/j.jss.2009.11.566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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142
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Ng J, Yamen E, Willson A. Reliability of Surface and Radiological Landmarks to Guide Femoral Artery (CFA) Puncture Site: Anatomical Variations in the Optimal Sheath Position. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.1020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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143
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Friedman A, Chan A, Chin LC, Deen A, Hammerschlag G, Lee M, Liddell J, Loh K, Moore E, Ng J, Gibson PR. Use and abuse of faecal occult blood tests in an acute hospital inpatient setting. Intern Med J 2009; 40:107-11. [DOI: 10.1111/j.1445-5994.2009.02149.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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144
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Klitz W, Gragert L, Maiers M, Tu B, Lazaro A, Yang R, Xu Q, Masaberg C, Ng J, Hurley CK. Four-locus high-resolution HLA typing in a sample of Mexican Americans. ACTA ACUST UNITED AC 2009; 74:508-13. [PMID: 19845916 DOI: 10.1111/j.1399-0039.2009.01374.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Mexicans are the most common minority population of the United States. From a sample of 553 bone marrow donor registrants of self-described Mexican ancestry, human leukocyte antigen (HLA) loci A, C, B and DRB1 were typed by high resolution sequence based typing (SBT) methods. A total of 47, 34, 76 and 46 distinct alleles at A, C, B and DRB1 respectively were identified, including 3 new alleles. The four-locus haplotype frequency distribution was extremely skewed with only 53.9% of 1106 chromosomes present with more than one estimated copy. Haplotypes of Native American origin were identified. These data form an initial basis for determining the requirements for an adequate donor pool for stem cell transplantation in this population.
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145
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Mollenhauer B, Trenkwalder C, Ng J, Locascio JJ, El-Agnaf OMA, Growdon J, Sudarsky L, Scherzer C, Schlossmacher M. Quantifizierung von α-Synuklein im Blut als Biomarker für M. Parkinson. AKTUELLE NEUROLOGIE 2009. [DOI: 10.1055/s-0029-1238374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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146
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Gorham PW, Allison P, Barwick SW, Beatty JJ, Besson DZ, Binns WR, Chen C, Chen P, Clem JM, Connolly A, Dowkontt PF, Duvernois MA, Field RC, Goldstein D, Goodhue A, Hast C, Hebert CL, Hoover S, Israel MH, Kowalski J, Learned JG, Liewer KM, Link JT, Lusczek E, Matsuno S, Mercurio BC, Miki C, Miocinović P, Nam J, Naudet CJ, Ng J, Nichol RJ, Palladino K, Reil K, Romero-Wolf A, Rosen M, Ruckman L, Saltzberg D, Seckel D, Varner GS, Walz D, Wang Y, Wu F. New limits on the ultrahigh energy cosmic neutrino flux from the ANITA experiment. PHYSICAL REVIEW LETTERS 2009; 103:051103. [PMID: 19792479 DOI: 10.1103/physrevlett.103.051103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 04/15/2009] [Indexed: 05/28/2023]
Abstract
We report initial results of the first flight of the Antarctic Impulsive Transient Antenna (ANITA-1) 2006-2007 Long Duration Balloon flight, which searched for evidence of a diffuse flux of cosmic neutrinos above energies of E(nu) approximately 3 x 10(18) eV. ANITA-1 flew for 35 days looking for radio impulses due to the Askaryan effect in neutrino-induced electromagnetic showers within the Antarctic ice sheets. We report here on our initial analysis, which was performed as a blind search of the data. No neutrino candidates are seen, with no detected physics background. We set model-independent limits based on this result. Upper limits derived from our analysis rule out the highest cosmogenic neutrino models. In a background horizontal-polarization channel, we also detect six events consistent with radio impulses from ultrahigh energy extensive air showers.
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147
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Antao B, Agarwal S, Ng J, Rodrigues B, Broadley P, Roberts J, Mackinnon AE. Is intravenous urography necessary in the assessment of renal duplex system in children? Surgeon 2009; 7:143-5. [PMID: 19580177 DOI: 10.1016/s1479-666x(09)80037-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE Partial or complete duplication of the renal tract may be an incidental finding or may be associated with significant pathology. Accurate assessment is not always easy. This retrospective review was undertaken to determine whether intravenous urography (IVU) in combination with a DMSA renal scan provides significant additional information. PATIENTS AND METHODS Eighteen patients referred to our imaging department with a provisional diagnosis on ultrasound of renal tract duplication during a three year period were identified by searching the radiological computer files. The presenting features were urinary infection (13), abdominal pain (3) and abnormal antenatal sonography (2). RESULTS Four patients were found not to have renal duplication. There was concordance between the IVU and DMSA scan in seven. Additional clinically relevant information was obtained in three cases. A false negative result from the DMSA scan was found in four children and a false positive result in three. CONCLUSION In a significant number of cases of possible renal tract duplication, additional relevant information can be obtained from an IVU. Patient distress is minimised by combining the IVU and DMSA in one single episode of venous access. Review of the radiological images during the investigation allows minimisation of radiation dosage.
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Lazaro AM, Xiao Y, Masaberg C, Nichol L, Ivaskova E, Banwart R, Field E, Ng J, Hurley CK, Posch PE. Description of novel class I alleles encountered during routine registry typing in 2007. ACTA ACUST UNITED AC 2009; 74:238-40. [PMID: 19523144 DOI: 10.1111/j.1399-0039.2009.01296.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Twenty-six novel human leukocyte antigen (HLA) class I alleles are described: 3 HLA-A alleles, 19 HLA-B alleles and 4 HLA-C alleles. Only one of the novel alleles (HLA-B*0753) was found in multiple individuals and likely is not uncommon in the population. Nineteen (approximately 70%) of the 26 novel alleles are single nucleotide substitution variants when compared with their most homologous allele. Four of these single nucleotide variants are silent substitutions, and one creates a null allele. The remaining novel alleles differ from their most similar allele by two to six nucleotide substitutions. Some of the new alleles encode novel codons and unique amino acid changes at polymorphic positions in the HLA-B lows (codons 30, 67 and 72), while HLA-Cw*0347 encodes an amino acid change at a position not previously reported to be polymorphic for this locus.
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149
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Lazaro AM, Xiao Y, Regenscheid A, Ng J, Hurley CK, Posch PE. Characterization of 104 novel alleles at the HLA-A, -B, and -DRB1 loci from National Marrow Donor Program volunteer donors. ACTA ACUST UNITED AC 2009; 73:364-72. [PMID: 19317748 DOI: 10.1111/j.1399-0039.2009.01226.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
One hundred and four novel human leukocyte antigen (HLA) alleles are described from volunteer donors of the National Marrow Donor Program: 37 HLA-A alleles, 37 HLA-B alleles, and 30 HLA-DRB1 alleles. Seventeen ( approximately 16%) of the novel alleles were found in multiple individuals and likely are relatively common in the population. Seventy-two ( approximately 69%) of the 104 novel alleles are single nucleotide substitution variants when compared with their most homologous allele. Nine of these single nucleotide variants are silent substitutions and three create null alleles. The remaining novel alleles differ from their most similar allele by two to seven nucleotide substitutions. Some of the novel alleles encode amino acid changes at positions not previously reported to be polymorphic, such as codons 6 and 11 in HLA-A alleles and codons 5, 105, and 141 in HLA-B alleles. Interestingly, one of the novel HLA-DRB1 alleles (*1471) has a change that is not the typical glycine/valine dimorphism at codon 86, which plays a key role in peptide binding to DR molecules. This is only the second DRB1 allele described that encodes an amino acid other than glycine or valine at this position.
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150
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Gao Y, Lim S, Gao F, Ng J, Phoon Y, Tham C, Quek R, Tao M. Analyzing white blood cell subpopulation for quick and simple predictors for autologous stem cell collection. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.7101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
7101 Background: For patients undergoing peripheral stem cell harvesting, the current standard predictor for successful harvest is the peripheral blood (PB)CD34 count, which may have a slow turn-around time. Daily monitoring of CD34 count may not be cost-effective. This study aims to identify simple hematological parameters that can be used to predict for a single day CD 34+ stem cell yield of at least 1 x 10(6)/kg. Methods: 57 patients with lymphoproliferative malignancies who underwent autologous stem cell (ASC) harvesting were studied following DHAP, ICE or ESHAP chemotherapy. Eight main parameters were investigated to predict for a single day CD34 stem cell yield above 1x10(6)/kg: PB CD34+ cells, absolute monocyte count (AMC), AMC ratio, total white count (WBC), absolute lymphocyte count (ALC), ALC ratio, immature granulocyte count (IMC), IMC ratio and non-neutrophil cells (NNC). NNC was calculated by subtracting absolute neutrophil count from the total white count. The ratios were calculated by dividing the respective values on the first day of harvest with the values on the day before mobilizing chemotherapy started. Results: Linear regression showed a strong correlation between stem cell yield and CD34+ cells (R2=0.79, p<0.001), IMC ratio (R2=0.51, p<0.001) and AMC ratio (R2= 0.46, P<0.001). WBC and AMC showed a wide dispersion of results and were not reliable predictors of CD34 yield. On multivariate analysis, an IMC > 1 (p=0.03) and AMC ratio > 1 (p=0.002), ALC ratio > 1 (p=0.03) were independently predictive of a single day CD34 stem cell yield exceeding 1x10(6)/kgConclusions: Incorporating simple, routine hematolgic indices such as ALC and AMC ratio into a simple formula can be used to predict for ASC collection in addition to CD34+ count. This may be particularly useful when the turn-around-time to attain enumeration of CD34+ cells is slow or delayed on the same day of collection. No significant financial relationships to disclose.
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