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Mynard P, Algar A, Lancaster L, Bocedi G, Fahri F, Gubry-Rangin C, Lupiyaningdyah P, Nangoy M, Osborne O, Papadopulos A, Sudiana IM, Juliandi B, Travis J, Herrera-Alsina L. Impact of Phylogenetic Tree Completeness and Misspecification of Sampling Fractions on Trait Dependent Diversification Models. Syst Biol 2023; 72:106-119. [PMID: 36645380 DOI: 10.1093/sysbio/syad001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 12/02/2022] [Accepted: 01/15/2023] [Indexed: 01/17/2023] Open
Abstract
Understanding the origins of diversity and the factors that drive some clades to be more diverse than others are important issues in evolutionary biology. Sophisticated SSE (state-dependent speciation and extinction) models provide insights into the association between diversification rates and the evolution of a trait. The empirical data used in SSE models and other methods is normally imperfect, yet little is known about how this can affect these models. Here, we evaluate the impact of common phylogenetic issues on inferences drawn from SSE models. Using simulated phylogenetic trees and trait information, we fitted SSE models to determine the effects of sampling fraction (phylogenetic tree completeness) and sampling fraction misspecification on model selection and parameter estimation (speciation, extinction, and transition rates) under two sampling regimes (random and taxonomically biased). As expected, we found that both model selection and parameter estimate accuracies are reduced at lower sampling fractions (i.e., low tree completeness). Furthermore, when sampling of the tree is imbalanced across subclades and tree completeness is ≤ 60%, rates of false positives increase and parameter estimates are less accurate, compared to when sampling is random. Thus, when applying SSE methods to empirical datasets, there are increased risks of false inferences of trait dependent diversification when some sub-clades are heavily under-sampled. Mis-specifying the sampling fraction severely affected the accuracy of parameter estimates: parameter values were over-estimated when the sampling fraction was specified as lower than its true value, and under-estimated when the sampling fraction was specified as higher than its true value. Our results suggest that it is better to cautiously under-estimate sampling efforts, as false positives increased when the sampling fraction was over-estimated. We encourage SSE studies where the sampling fraction can be reasonably estimated and provide recommended best practices for SSE modelling.
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Affiliation(s)
- Poppy Mynard
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
| | - Adam Algar
- Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada
| | - Lesley Lancaster
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
| | - Greta Bocedi
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
| | - Fahri Fahri
- Department of Biology, Tadulako University, Palu, Indonesia
| | | | - Pungki Lupiyaningdyah
- Museum Zoologicum Bogoriense, Research Center for Biology, Indonesian Institute of Sciences, Cibinong, 16911, Indonesia
| | - Meis Nangoy
- Faculty of Animal Husbandry, Sam Ratulangi University, Kampus Bahu Street, Manado, 95115 Indonesia
| | - Owen Osborne
- School of Natural Sciences, Bangor University, Environment Centre Wales, Deiniol Road, Bangor, LL57 2UW, UK
| | - Alexander Papadopulos
- School of Natural Sciences, Bangor University, Environment Centre Wales, Deiniol Road, Bangor, LL57 2UW, UK
| | - I Made Sudiana
- Microbial Ecology Research Group, Research Center for Biology, Indonesian Institute of Sciences, Cibinong 19611, Indonesia
| | - Berry Juliandi
- Department of Biology, Faculty of Mathematics and Natural Sciences, IPB University, Bogor, 16680, Indonesia
| | - Justin Travis
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
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Salguero‐Gómez R, Evans DM, Gaillard J, Lancaster L, Sanders NJ, Scandrett K, Meyer J. Time counts in animal ecology. J Anim Ecol 2022; 91:2154-2157. [DOI: 10.1111/1365-2656.13821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 10/10/2022] [Indexed: 11/06/2022]
Affiliation(s)
| | - Darren M. Evans
- School of Natural and Environmental Sciences Newcastle University Newcastle‐upon‐Tyne UK
| | - Jean‐Michel Gaillard
- Mixed Research Unit (UMR 5558) “Biometry & Evolutionary Biology” University Claude Bernard Lyon 1, Campus de la Doua, Bâtiment Mendel Villeurbanne Cedex France
| | - Lesley Lancaster
- School of Biological Sciences University of Aberdeen Aberdeen UK
| | - Nathan J. Sanders
- Department of Ecology and Evolutionary Biology University of Michigan Ann Arbor Michigan USA
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Gaillard JM, Sanders NJ, Lancaster L, Evans D, Hoggart SPG, Newton EL. A new Editor team. J Anim Ecol 2020; 89:4-5. [PMID: 32091639 DOI: 10.1111/1365-2656.13165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jean-Michel Gaillard
- CNRS, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, Villeurbanne, France
| | - Nathan J Sanders
- Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT, USA
| | - Lesley Lancaster
- Institute of Biological and Environmental Sciences, The University of Aberdeen, Aberdeen, UK
| | - Darren Evans
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, UK
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Rahman M, Stott MA, Harrington M, Li Y, Sampad MJN, Lancaster L, Yuzvinsky TD, Noller HF, Hawkins AR, Schmidt H. On demand delivery and analysis of single molecules on a programmable nanopore-optofluidic device. Nat Commun 2019; 10:3712. [PMID: 31420559 PMCID: PMC6697697 DOI: 10.1038/s41467-019-11723-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 07/19/2019] [Indexed: 12/29/2022] Open
Abstract
Nanopore-based single nanoparticle detection has recently emerged as a vibrant research field with numerous high-impact applications. Here, we introduce a programmable optofluidic chip for nanopore-based particle analysis: feedback-controlled selective delivery of a desired number of biomolecules and integration of optical detection techniques on nanopore-selected particles. We demonstrate the feedback-controlled introduction of individual biomolecules, including 70S ribosomes, DNAs and proteins into a fluidic channel where the voltage across the nanopore is turned off after a user-defined number of single molecular insertions. Delivery rates of hundreds/min with programmable off-times of the pore are demonstrated using individual 70S ribosomes. We then use real-time analysis of the translocation signal for selective voltage gating of specific particles from a mixture, enabling selection of DNAs from a DNA-ribosome mixture. Furthermore, we report optical detection of nanopore-selected DNA molecules. These capabilities point the way towards a powerful research tool for high-throughput single-molecule analysis on a chip.
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Affiliation(s)
- M Rahman
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - M A Stott
- ECEn Department, Brigham Young University, 459 Clyde Building, Provo, UT, 84602, USA
| | - M Harrington
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - Y Li
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - M J N Sampad
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - L Lancaster
- Department of Molecular, Cell and Developmental Biology and Center for Molecular Biology of RNA, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - T D Yuzvinsky
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - H F Noller
- Department of Molecular, Cell and Developmental Biology and Center for Molecular Biology of RNA, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - A R Hawkins
- ECEn Department, Brigham Young University, 459 Clyde Building, Provo, UT, 84602, USA
| | - H Schmidt
- School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA.
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5
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Costabel U, Nathan SD, Lancaster L, Albera C, Glassberg MK, Swigris JJ, Gilberg F, Kirchgaessler KU, Petzinger U, Noble PW. Dose modifications and dose intensity during treatment with pirfenidone. Pneumologie 2017. [DOI: 10.1055/s-0037-1598499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- U Costabel
- Interstitielle und Seltene Lungenkrankheiten, Interstitial and Rare Lung Disease Unit, Ruhrlandklinik
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Noble PW, Albera C, Lancaster L, Hormel P, Hulter H, Costabel U. P169 Long-term safety of pirfenidone in patients with idiopathic pulmonary fibrosis: pooled analysis of 4 clinical trials. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Wells AU, Albera C, Costabel U, Glaspole I, Glassberg MK, Lancaster L, Lederer DJ, Pereira CA, Swigris JJ, Day BM, Chou W, Nathan SD. P174 Effect of continued treatment with pirfenidone following a ≥10% relative decline in percent predicted forced vital capacity (%FVC) in patients with idiopathic pulmonary fibrosis (IPF). Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Noble PW, Albera C, Chou W, Costabel U, Day B, Glaspole I, Glassberg MK, Lancaster L, Lederer DJ, Nathan SD, Pereira CA, Stauffer J, Swigris JJ. S97 Annual rate of fvc decline in various patient sub-groups with idiopathic pulmonary fibrosis treated with pirfenidone: pooled analysis from 3 pivotal studies. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Costabel U, Albera C, Bradford WZ, Fagan EA, Glaspole I, Glassberg MK, Gorina E, Kardatzke D, King TE, Lancaster L, Lederer DJ, Nathan SD, Pereira CA, Spirig D, Swigris JJ, Valeyre D, Noble PW. Pirfenidone is Efficacious in Patients with Idiopathic Pulmonary Fibrosis (IPF) and Mild Restrictive Disease. Pneumologie 2016. [DOI: 10.1055/s-0036-1572064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Costabel U, Nathan SD, Albera C, Bradford WZ, Fagan EA, Glaspole I, Glassberg MK, Kardatzke D, King TE, Kirchgaessler KU, Lancaster L, Lederer DJ, Pereira CA, Swigris JJ, Valeyre D, Noble PW. Effect of Pirfenidone on Treatment-emergent (TE) All-cause Mortality (ACM) in Patients with Idiopathic Pulmonary Fibrosis (IPF): Pooled Data Analysis from ASCEND and CAPACITY. Pneumologie 2016. [DOI: 10.1055/s-0036-1572066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Costabel U, Nathan SD, Albera C, Bradford WZ, Fagan EA, Glaspole I, Glassberg MK, King TE, Lancaster L, Lederer DJ, Lin Z, Pereira CA, Swigris JJ, Valeyre D, Noble PW. Effect of continued treatment with pirfenidone following a clinically meaningful decline in percent predicted forced vital capacity in patients with idiopathic pulmonary fibrosis (IPF). Pneumologie 2016. [DOI: 10.1055/s-0036-1572141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Costabel U, Lancaster L, Albera C, Bradford WZ, Fagan EA, Fishman R, Glaspole I, Glassberg MK, King TE, Lederer DJ, Lin Z, Nathan SD, Pereira CA, Swigris JJ, Valeyre D, Noble PW. Safety of pirfenidone in patients with idiopathic pulmonary fibrosis (IPF): Integrated analysis of cumulative data from 5 clinical trials. Pneumologie 2016. [DOI: 10.1055/s-0036-1572063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Noble PW, Bradford WZ, Costabel U, Glaspole I, Glassberg MK, Gorina E, Kardatzke D, Lancaster L, Lederer DJ, Nathan SD, Pereira C, Spirig D, Swigris JJ, Valeyre D, Albera C. P14 Pirfenidone is efficacious in patients with idiopathic pulmonary fibrosis (IPF) with more preserved lung function. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Noble PW, Albera C, Bradford WZ, Costabel U, Glaspole I, Glassberg MK, Lancaster L, Lederer DJ, Lin Z, Pereira CA, Swigris JJ, Valeyre D, Nathan SD. S109 Effect of continued treatment with pirfenidone following a clinically meaningful decline in percent predicted forced vital capacity in patients with idiopathic pulmonary fibrosis (IPF): Abstract S109 Table 1. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Noble PW, Albera C, Bradford WZ, Costabel U, Glaspole I, Glassberg MK, Lederer DJ, Lin Z, Nathan SD, Pereira CA, Swigris JJ, Valeyre D, Lancaster L. P13 Safety of pirfenidone in patients with idiopathic pulmonary fibrosis (IPF): Integrated analysis of cumulative data from 5 clinical trials: Abstract P13 Table 1. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Mills S, Hazard L, Lancaster L, Mappes T, Miles D, Oksanen T, Sinervo B. Gonadotropin Hormone Modulation of Testosterone, Immune Function, Performance, and Behavioral Trade‐Offs among Male Morphs of the Lizard Uta stansburiana. Am Nat 2008; 171:339-57. [DOI: 10.1086/527520] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Sinervo B, Chaine A, Clobert J, Calsbeek R, Hazard L, Lancaster L, McAdam AG, Alonzo S, Corrigan G, Hochberg ME. Self-recognition, color signals, and cycles of greenbeard mutualism and altruism. Proc Natl Acad Sci U S A 2006; 103:7372-7. [PMID: 16651531 PMCID: PMC1564281 DOI: 10.1073/pnas.0510260103] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2005] [Indexed: 11/18/2022] Open
Abstract
Altruism presents a challenge to evolutionary theory because selection should favor selfish over caring strategies. Greenbeard altruism resolves this paradox by allowing cooperators to identify individuals carrying similar alleles producing a form of genic selection. In side-blotched lizards, genetically similar but unrelated blue male morphs settle on adjacent territories and cooperate. Here we show that payoffs of cooperation depend on asymmetric costs of orange neighbors. One blue male experiences low fitness and buffers his unrelated partner from aggressive orange males despite the potential benefits of defection. We show that recognition behavior is highly heritable in nature, and we map genetic factors underlying color and self-recognition behavior of genetic similarity in both sexes. Recognition and cooperation arise from genome-wide factors based on our mapping study of the location of genes responsible for self-recognition behavior, recognition of blue color, and the color locus. Our results provide an example of greenbeard interactions in a vertebrate that are typified by cycles of greenbeard mutualism interspersed with phases of transient true altruism. Such cycles provide a mechanism encouraging the origin and stability of true altruism.
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Affiliation(s)
- Barry Sinervo
- Department of Ecology and Evolutionary Biology, University of California, Earth and Marine Sciences Building, Santa Cruz, CA 95064, USA.
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Noller HF, Yusupov MM, Yusupova GZ, Baucom A, Lieberman K, Lancaster L, Dallas A, Fredrick K, Earnest TN, Cate JH. Structure of the ribosome at 5.5 A resolution and its interactions with functional ligands. Cold Spring Harb Symp Quant Biol 2003; 66:57-66. [PMID: 12762008 DOI: 10.1101/sqb.2001.66.57] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- H F Noller
- Center for Molecular Biology of RNA, Sinsheimer Laboratories, University of California at Santa Cruz, California 95064, USA
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Lancaster L, Culver GM, Yusupova GZ, Cate JH, Yusupov MM, Noller HF. The location of protein S8 and surrounding elements of 16S rRNA in the 70S ribosome from combined use of directed hydroxyl radical probing and X-ray crystallography. RNA 2000; 6:717-729. [PMID: 10836793 PMCID: PMC1369952 DOI: 10.1017/s1355838200000303] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Ribosomal protein S8, which is essential for the assembly of the central domain of 16S rRNA, is one of the most thoroughly studied RNA-binding proteins. To map its surrounding RNA in the ribosome, we carried out directed hydroxyl radical probing of 16S rRNA using Fe(II) tethered to nine different positions on the surface of protein S8 in 70S ribosomes. Hydroxyl radical-induced cleavage was observed near the classical S8-binding site in the 620 stem, and flanking the other S8-footprinted regions of the central domain at the three-helix junction near position 650 and the 825 and 860 stems. In addition, cleavage near the 5' terminus of 16S rRNA, in the 300 region of its 5' domain, and in the 1070 region of its 3'-major domain provide information about the proximity to S8 of RNA elements not directly involved in its binding. These data, along with previous footprinting and crosslinking results, allowed positioning of protein S8 and its surrounding RNA elements in a 7.8-A map of the Thermus thermophilus 70S ribosome. The resulting model is in close agreement with the extensive body of data from previous studies using protein-protein and protein-RNA crosslinking, chemical and enzymatic footprinting, and genetics.
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Affiliation(s)
- L Lancaster
- Center for Molecular Biology of RNA, Sinsheimer Laboratories, University of California, Santa Cruz 95064, USA
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Khaitovich P, Mankin AS, Green R, Lancaster L, Noller HF. Characterization of functionally active subribosomal particles from Thermus aquaticus. Proc Natl Acad Sci U S A 1999; 96:85-90. [PMID: 9874776 PMCID: PMC15097 DOI: 10.1073/pnas.96.1.85] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Peptidyl transferase activity of Thermus aquaticus ribosomes is resistant to the removal of a significant number of ribosomal proteins by protease digestion, SDS, and phenol extraction. To define the upper limit for the number of macromolecular components required for peptidyl transferase, particles obtained by extraction of T. aquaticus large ribosomal subunits were isolated and their RNA and protein composition was characterized. Active subribosomal particles contained both 23S and 5S rRNA associated with notable amounts of eight ribosomal proteins. N-terminal sequencing of the proteins identified them as L2, L3, L13, L15, L17, L18, L21, and L22. Ribosomal protein L4, which previously was thought to be essential for the reconstitution of particles active in peptide bond formation, was not found. These findings, together with the results of previous reconstitution experiments, reduce the number of possible essential macromolecular components of the peptidyl transferase center to 23S rRNA and ribosomal proteins L2 and L3. Complete removal of ribosomal proteins from T. aquaticus rRNA resulted in loss of tertiary folding of the particles and inactivation of peptidyl transferase. The accessibility of proteins in active subribosomal particles to proteinase hydrolysis was increased significantly after RNase treatment. These results and the observation that 50S ribosomal subunits exhibited much higher resistance to SDS extraction than 30S subunits are compatible with a proposed structural organization of the 50S subunit involving an RNA "cage" surrounding a core of a subset of ribosomal proteins.
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Affiliation(s)
- P Khaitovich
- Center for Pharmaceutical Biotechnology, m/c 870, University of Illinois, 900 South Ashland Avenue, Chicago, IL 60607, USA
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King JE, Lancaster L, Pierce J, Norman LD. Removing the walls and expanding the boundaries. A curriculum model for acute care nurse practitioners. N HC Perspect Community 1996; 17:304-7. [PMID: 9087002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- J E King
- Vanderbilt University School of Nursing, Nashville, TN, USA
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Abstract
Postoperative radiographic changes after pectus repair have not previously been described. We reviewed the chest radiographs of 65 children who underwent surgical repair of pectus excavatum between early 1985 and mid-1992. After operation, 64 children showed atelectasis, 38 had pleural effusions, 30 showed a congestion or edema pattern, 12 had pneumothorax, 21 showed fixation strut tilt or rotation, and 4 had pneumomediastinum. Despite the sometimes worrying radiographic appearance, these children uniformly did well clinically.
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Affiliation(s)
- L Lancaster
- Department of Radiology, University of Virginia Health Sciences Center, Charlottesville 22908, USA
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Sharma NK, Kindelan JD, Hutchinson D, Lancaster L. A study to compare ibuprofen effervescent granules with ibuprofen tablets in the treatment of acute dental pain. Prim Dent Care 1994; 1:5-8. [PMID: 8941780] [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] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE OF STUDY To compare both the speed of onset and efficacy of the analgesia produced by the effervescent granule formulation with that produced by the conventional-release tablet formulation of ibuprofen in patients suffering acute dental pain and to record the incidence and severity of any adverse events. POPULATION STUDIED Dental out-patients of either sex and over 16 years of age requiring surgical removal of unilateral or bilateral lower third molar teeth under general anaesthesia as day cases. METHODS A total of 50 patients received the effervescent granules formulation of ibuprofen 600 mg (Brufen Granules) as study treatment and 50 received the 600 mg tablet formulation in this investigator-blind, parallel-group multiple-dose study. Surgery was performed under general anaesthesia by one or two dental surgeons. Patients received either one sachet of ibuprofen granules or one tablet of ibuprofen at six-hourly intervals for up to 24 hours once post-operative pain became moderate to severe. FINDINGS Both treatments were shown to be efficacious in treating post-operative dental pain. The granules were found to give significantly better pain relief in the first 30 minutes following the first dose. This may be owing to a more rapid absorption from the granules formulation in these patients and/or a local action of ibuprofen in solution in the mouth. CONCLUSION The effervescent soluble form of ibuprofen (Brufen Granules) is preferable to the conventional tablet form in managing the immediate dental pain experienced post-operatively by most patients because of its faster onset of action.
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Affiliation(s)
- N K Sharma
- Pinderfields General Hospital, Wakefield
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Abstract
Accurate histological diagnosis and staging are critically important in determining the optimal management of patients with testicular cancer. We have assessed the importance of histological review of "outside" pathology reports from 87 patients referred to the Urological Cancer Research Unit. In 28 patients (32%), the reviewed pathology report differed from the outside report. In 10 of these patients (11%), the pathology review resulted in a change of treatment or prognosis from that which would have obtained in the absence of such histological review. Pathology review at a major cancer centre with a subspecialist interest in tumour pathology and a large experience in the management of germ cell malignancy is an essential first step in the treatment of testicular cancer.
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Affiliation(s)
- E Segelov
- Urological Cancer Research Unit, Royal Prince Alfred Hospital, Camperdown, Australia
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25
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Lancaster L. Nursing information systems in the year 2000: another perspective. Comput Nurs 1993; 11:3-5. [PMID: 8428319] [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: 01/30/2023]
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Abstract
This study was done to see if signal intensity in sodium images of edematous rat lungs made after iv administration of a negative intravascular contrast agent could serve as a measure of the edema fluid present. First, a method to produce a stable condition of hydrostatic pulmonary edema was developed and verified by CT. Second, dose-response curves for coated magnetite preparations were constructed by giving edematous rats varied doses of these preparations and measuring signal intensity changes of various organs by sodium MRI in a 31-cm-bore 1.9-T magnet. Third, rats were given varied levels of pulmonary edema followed by a constant dose of coated magnetite to eliminate the plasma sodium signal. Finally, coated magnetite particles of two sizes were administered to rats, and the differences in effects on signal from various organs were measured. Signal intensity of the lungs after magnetite correlated (r = 0.86) with extravascular lung water measured gravimetrically, suggesting that sodium MRI may be useful for measuring pulmonary edema fluid. Smaller particles appear to remain in the blood longer than larger particles.
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Affiliation(s)
- L Lancaster
- Pendergrass Diagnostic Radiology Research Laboratory, Department of Radiology, University of Pennsylvania School of Medicine, Philadelphia 19104
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Affiliation(s)
- R E Morrison
- Regional Medical Center, University of Tennessee, Memphis 38103
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Lancaster L. System identifies problems of hospital department. Health Care Strateg Manage 1990; 8:13-5. [PMID: 10113362] [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: 02/11/2023]
Abstract
Identifying and quantifying problems within and outside a hospital business unit is essential if quality improvement is to be successful. In the following article, the author describes how to establish a system in which those problems can be identified and dealt with by the managers and staff of any business unit in the hospital.
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Kern KB, Lancaster L, Goldman S, Ewy GA. The effect of coronary artery lesions on the relationship between coronary perfusion pressure and myocardial blood flow during cardiopulmonary resuscitation in pigs. Am Heart J 1990; 120:324-33. [PMID: 2382610 DOI: 10.1016/0002-8703(90)90076-a] [Citation(s) in RCA: 37] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In subjects without coronary disease, coronary perfusion pressure generated with closed-chest cardiopulmonary resuscitation (CPR) bears a direct relationship to myocardial blood flow. The effect of coronary lesions on this relationship was studied in an experimental porcine model not requiring thoracotomy. Coronary stenoses (a 50% reduction in coronary cross-sectional area) or total coronary occlusions were created by percutaneous, transarterial catheter placement of a Teflon cylinder in the left anterior descending artery of 21 swine (30 to 60 kg). Coronary perfusion pressure, defined as the aortic diastolic pressure minus right atrial diastolic pressure, was correlated with myocardial blood flow measured with nonradioactive, colored microspheres during external chest compression CPR. Complete occlusion of the left anterior coronary artery resulted in essentially no CPR-generated blood flow to the anterior myocardium distal to the site of occlusion. Coronary perfusion pressure showed a positive correlation with myocardial blood flow above the area of occlusion (r = 0.783; p less than 0.01) but did not correlate with myocardial blood flow below the occlusion site (r = 0.239). In the presence of a patent coronary artery stenosis, coronary perfusion pressure correlated with myocardial blood flow both above (r = 0.841; p less than 0.001) and below (r = 0.508; p less than 0.05) the stenosis. During closed-chest CPR producing coronary perfusion pressures between 30 and 60 mm Hg, anterior myocardial blood flow was 109 +/- 16 ml/min/100 gm above a patent stenosis and 66 +/- 13 ml/min/100 gm below the stenosis (p less than 0.005). Over a wide range of coronary perfusion pressures, myocardial blood flow below a coronary lesion was significantly less than that above the lesion. Coronary occlusions and stenoses can substantially affect the amount of CPR-generated coronary perfusion pressure needed to produce distal myocardial blood flow.
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Affiliation(s)
- K B Kern
- Department of Internal Medicine, University of Arizona College of Medicine, Tucson
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Crome P, Wijayawardhana P, Lancaster L, Streete PJ, Flanagan RJ. Single and Multiple Dose Pharmacokinetics of Ibuprofen Effervescent Granules or Tablets in Elderly Volunteers. Clin Drug Investig 1990. [DOI: 10.1007/bf03259403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Clark MJ, Chapman ND, Noyelle RM, Lancaster L. An open multiple dose study of Optrex Eye Lotion in eye irritation due to hayfever. Br J Clin Pract 1989; 43:357-9. [PMID: 2698241] [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: 01/02/2023]
Abstract
Twenty-four patients consulting their general practitioner with eye irritation due to hayfever entered a seven-day open, multiple dose study of a newly formulated Optrex Eye Lotion. Patients self-administered Optrex by irrigation into their left eye three times daily for seven days, with an option to use the same preparation in their right eye if they thought this to be of benefit. Assessment was by means of daily diary cards completed by the patient each evening for the seven-day period. Following the first instillation, the treated eye felt significantly better at 20 seconds and at four minutes when compared with the untreated eye. Differences between the eyes for degree of redness, comfort and clearness of vision were not significant, but 15 patients (63 per cent) optionally used Optrex in their right eye. Seventeen patients (71 per cent) reported that they derived overall benefit from the use of Optrex Eye Lotion during the study period. Two patients reported side effects during the study but, in each case, the investigator did not consider the event to be therapy related. One patient withdrew on Day 7 of the trial due to worsening of their allergic conjunctivitis. It can be concluded that some subjective benefit was gained by the majority of patients in that a considerable number of them chose to treat both eyes for the duration of the study.
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Raya TE, Gay RG, Lancaster L, Aguirre M, Moffett C, Goldman S. Serial changes in left ventricular relaxation and chamber stiffness after large myocardial infarction in rats. Circulation 1988; 77:1424-31. [PMID: 3370778 DOI: 10.1161/01.cir.77.6.1424] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
To determine the time course of changes in left ventricular diastolic properties after a large myocardial infarction, we serially measured left ventricular relaxation, chamber stiffness, and the ratio of left ventricular cavity to wall volume (V/VW) after coronary artery ligation in rats. Left ventricular relaxation was measured during the occlusion and then both relaxation and chamber stiffness were measured at 3 hr, 24 hr, and 3, 5, and more than 22 days after infarction. Left ventricular pressures and left ventricular dP/dt were recorded with micromanometer-tipped catheters. Left ventricular relaxation was measured by computer digitization of the left ventricular pressure tracings and averaged over 100 to 150 cardiac cycles. Five chamber stiffness constants were calculated from pressure-volume curves that were obtained ex vivo. We found ventricular relaxation prolonged for the first hour after coronary occlusion; relaxation was maximally prolonged at 10 to 15 min after onset of occlusion. After 1 hr relaxation returned to normal. However, by 5 days ventricular relaxation was again prolonged. Left ventricular stiffness constants were increased at 3 and 24 hr, resulting in a shift of the left ventricular pressure-volume relation to the left. At 3 days after coronary artery ligation, all stiffness constants and the pressure-volume relation returned to normal. At more than 22 days the pressure-volume relation was shifted to the right and the stiffness constant for low filling pressures was decreased. V/VW was significantly decreased from 0.603 +/- 0.021 at 3 and 24 hr to 0.379 +/- 0.024 and 0.362 +/- 0.032, respectively. V/VW was significantly increased at more than 22 days (0.921 +/- 0.094).(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- T E Raya
- Department of Internal Medicine, Tucson Veterans Administration Medical Center, AZ 85723
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Abstract
Right ventricular function at rest and during exercise was examined in a group of patients with symptomatic aortic or mitral valve disease, or both. The right ventricular ejection fraction was less than 45% in 22 of 36 patients at rest and in 12 of 17 subjects at symptom-limited, supine bicycle exercise. The right ventricular ejection fraction failed to increase more than 5% with exercise in 17 of 17 patients. The central venous pressure was greater than 5 mm Hg in 18 of 36 patients at rest and in 13 of 17 patients at maximal exercise. There was a significant inverse relation between rest right ventricular ejection fraction and mean pulmonary artery pressure (r = -0.47, p less than 0.05) and between rest right ventricular ejection fraction and mean central venous pressure (r = -0.39, p less than 0.05). There was no significant relation between the exercise values of these variables. In individual patients, the changes in right ventricular ejection fraction and pulmonary artery pressure with graded exercise were nonlinear. It is concluded that right ventricular function is not a simple function of pulmonary artery pressure at rest or during exercise in aortic and mitral valve disease. Less than one-quarter of the variation in right ventricular ejection fraction at rest can be explained by the variation in pulmonary artery pressure, and the finding of a normal (greater than 45%) right ventricular ejection fraction does not reliably exclude the possibility of pulmonary hypertension in a patient with valvular heart disease.
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Abstract
A 62-year-old man who was under observation following an episode of severe chest pain developed complete heart block and hypotension after receiving sublingual nitroglycerin. The reaction occurred while the patient was receiving an intravenous maintenance infusion of lidocaine but did not occur in response to either nitroglycerin alone or lidocaine alone. There was no evidence of acute cardiac ischemia nor of clinically significant underlying heart disease. Complete heart block after sublingual nitroglycerin in the absence of significant cardiac disease is an exceedingly rare phenomenon.
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Watt JH, Eglington RD, Lancaster L, Bell JM. The nursing management of morbidly obese patients undergoing bariatric surgery. Lamp 1982; 39:54-8. [PMID: 6186872] [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: 01/18/2023]
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Larsen KS, Lancaster L, Lesh W, Redding J, White C, Larsen KS. Approval seeking, situational pressures, and the willingness to administer shock to a victim. J Soc Psychol 1976; 99:87-95. [PMID: 1271776 DOI: 10.1080/00224545.1976.9924751] [Citation(s) in RCA: 5] [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: 12/26/2022]
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Lancaster L, Fournet LF. Carcinoma of the tongue in a child: report of case. J Oral Surg 1969; 27:269-70. [PMID: 5251403] [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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Lancaster L. Mesenteric Adenitis and Ascariasis. West J Med 1959. [DOI: 10.1136/bmj.2.5150.501-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Lancaster L. Right to Hospital Treatment. West J Med 1955. [DOI: 10.1136/bmj.2.4935.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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