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Wiest C, Torrecillos F, Tinkhauser G, Pogosyan A, Morgante F, Pereira EA, Tan H. Finely-tuned gamma oscillations: Spectral characteristics and links to dyskinesia. Exp Neurol 2022; 351:113999. [PMID: 35143832 PMCID: PMC7612436 DOI: 10.1016/j.expneurol.2022.113999] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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] [Received: 10/05/2021] [Revised: 01/27/2022] [Accepted: 02/02/2022] [Indexed: 01/22/2023]
Abstract
Gamma oscillations comprise a loosely defined, heterogeneous group of functionally different activities between 30 and 100 Hz in the cortical and subcortical local field potential (LFP) of the motor network. Two distinct patterns seem to emerge which are easily conflated: Finely-tuned gamma (FTG) oscillations - a narrowband activity with peaks between 60 and 90 Hz - have been observed in multiple movement disorders and are induced by dopaminergic medication or deep brain stimulation (DBS). FTG has been linked with levodopa or DBS-induced dyskinesias, which makes it a putative biomarker for adaptive DBS. On the other hand, gamma activity can also present as a broad phenomenon (30-100 Hz) in the context of motor activation and dynamic processing. Here, we contrast FTG, either levodopa-induced or DBS-induced, from movement-related broadband gamma synchronisation and further elaborate on the functional role of FTG and its potential implications for adaptive DBS. Given the unclear distinction of FTG and broad gamma in literature, we appeal for more careful separation of the two. To better characterise cortical and subcortical FTG as biomarkers for dyskinesia, their sensitivity and specificity need to be investigated in a large clinical trial.
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Affiliation(s)
- C Wiest
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - F Torrecillos
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - G Tinkhauser
- Department of Neurology, Bern University Hospital and University of Bern, Bern, Switzerland
| | - A Pogosyan
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - F Morgante
- Neurosciences Research Centre, Molecular and Clinical Sciences Institute, St. George's, University of London, London, UK; Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - E A Pereira
- Neurosciences Research Centre, Molecular and Clinical Sciences Institute, St. George's, University of London, London, UK
| | - H Tan
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.
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Ricciardi L, De Angelis A, Marsili L, Faiman I, Pradhan P, Pereira EA, Edwards MJ, Morgante F, Bologna M. Hypomimia in Parkinson’s disease: an axial sign responsive to levodopa. Eur J Neurol 2020; 27:2422-2429. [DOI: 10.1111/ene.14452] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/17/2020] [Accepted: 07/19/2020] [Indexed: 11/30/2022]
Affiliation(s)
- L. Ricciardi
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London London UK
- Nuffield Department of Clinical Neurosciences MRC Brain Network Dynamics Unit Oxford UK
| | - A. De Angelis
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London London UK
| | - L. Marsili
- Gardner Family Center for Parkinson's Disease and Movement Disorders Department of Neurology University of Cincinnati Cincinnati OH USA
| | - I. Faiman
- Clinical Neuropsychology Service St George’s University Hospital NHS Foundation Trust London UK
| | - P. Pradhan
- Clinical Neuropsychology Service St George’s University Hospital NHS Foundation Trust London UK
| | - E. A. Pereira
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London London UK
| | - M. J. Edwards
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London London UK
| | - F. Morgante
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London London UK
- Department of Experimental and Clinical Medicine University of Messina Messina Italy
| | - M. Bologna
- Department of Human Neurosciences Sapienza University of Rome Rome Italy
- IRCCS Neuromed Pozzilli (IS) Italy
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Wiest C, Tinkhauser G, Pogosyan A, Bange M, Muthuraman M, Groppa S, Baig F, Mostofi A, Pereira EA, Tan H, Brown P, Torrecillos F. Local field potential activity dynamics in response to deep brain stimulation of the subthalamic nucleus in Parkinson's disease. Neurobiol Dis 2020; 143:105019. [PMID: 32681881 PMCID: PMC7115855 DOI: 10.1016/j.nbd.2020.105019] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/17/2020] [Accepted: 07/11/2020] [Indexed: 02/06/2023] Open
Abstract
Local field potentials (LFPs) may afford insight into the mechanisms of action of deep brain stimulation (DBS) and potential feedback signals for adaptive DBS. In Parkinson's disease (PD) DBS of the subthalamic nucleus (STN) suppresses spontaneous activity in the beta band and drives evoked resonant neural activity (ERNA). Here, we investigate how STN LFP activities change over time following the onset and offset of DBS. To this end we recorded LFPs from the STN in 14 PD patients during long (mean: 181.2 s) and short (14.2 s) blocks of continuous stimulation at 130 Hz. LFP activities were evaluated in the temporal and spectral domains. During long stimulation blocks, the frequency and amplitude of the ERNA decreased before reaching a steady state after ~70 s. Maximal ERNA amplitudes diminished over repeated stimulation blocks. Upon DBS cessation, the ERNA was revealed as an under-damped oscillation, and was more marked and lasted longer after short duration stimulation blocks. In contrast, activity in the beta band suppressed within 0.5 s of continuous DBS onset and drifted less over time. Spontaneous activity was also suppressed in the low gamma band, suggesting that the effects of high frequency stimulation on spontaneous oscillations may not be selective for pathological beta activity. High frequency oscillations were present in only six STN recordings before stimulation onset and their frequency was depressed by stimulation. The different dynamics of the ERNA and beta activity with stimulation imply different DBS mechanisms and may impact how these activities may be used in adaptive feedback.
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Affiliation(s)
- C Wiest
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - G Tinkhauser
- Department of Neurology, Bern University Hospital, Bern, Switzerland
| | - A Pogosyan
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - M Bange
- Movement Disorders and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, Mainz University Hospital, Mainz, Germany
| | - M Muthuraman
- Movement Disorders and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, Mainz University Hospital, Mainz, Germany
| | - S Groppa
- Movement Disorders and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, Mainz University Hospital, Mainz, Germany
| | - F Baig
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK; Neurosciences Research Centre, Molecular and Clinical Sciences Institute, St. George's, University of London, London, UK
| | - A Mostofi
- Neurosciences Research Centre, Molecular and Clinical Sciences Institute, St. George's, University of London, London, UK
| | - E A Pereira
- Neurosciences Research Centre, Molecular and Clinical Sciences Institute, St. George's, University of London, London, UK
| | - H Tan
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - P Brown
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - F Torrecillos
- Medical Research Council Brain Network Dynamics Unit, University of Oxford, Oxford, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.
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Paraiso LF, de Freitas MV, Gonçalves-E-Oliveira AFM, de Almeida Neto OP, Pereira EA, Mascarenhas Netto RC, Cunha LM, Bernardino Neto M, de Agostini GG, Resende ES, Penha-Silva N. Influence of acute exercise on the osmotic stability of the human erythrocyte membrane. Int J Sports Med 2014; 35:1072-7. [PMID: 25144434 DOI: 10.1055/s-0034-1371834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
This study evaluated the effects of 2 different types of acute aerobic exercise on the osmotic stability of human erythrocyte membrane and on different hematological and biochemical variables that are associated with this membrane property. The study population consisted of 20 healthy and active men. Participants performed single sessions of 2 types of exercise. The first session consisted of 60 min of moderate-intensity continuous exercise (MICE). The second session, executed a week later, consisted of high-intensity interval exercise (HIIE) until exhaustion. The osmotic stability of the erythrocyte membrane was represented by the inverse of the salt concentration (1/H50) at the midpoint of the sigmoidal curve of dependence between the absorbance of hemoglobin and the NaCl concentration. The values of 1/H50 changed from 2.29±0.1 to 2.33±0.09 after MICE and from 2.30±0.08 to 2.23±0.12 after HIIE. During MICE mean corpuscular volume increased, probably due to in vivo lysis of older erythrocytes, with preservation of cells that were larger and more resistant to in vitro lysis. The study showed that a single bout of acute exercise affected erythrocyte stability, which increased after MICE and decreased after HIIE.
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Affiliation(s)
- L F Paraiso
- Institute of Genetics and Biochemisty, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - M V de Freitas
- Institute of Genetics and Biochemisty, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | | | - O P de Almeida Neto
- Faculty of Medicine, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - E A Pereira
- Institute of Genetics and Biochemisty, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - R C Mascarenhas Netto
- Institute of Genetics and Biochemisty, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - L M Cunha
- Institute of Genetics and Biochemisty, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - M Bernardino Neto
- Institute of Genetics and Biochemisty, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - G G de Agostini
- Faculty of Physical Education, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - E S Resende
- Faculty of Physical Education, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - N Penha-Silva
- Institute of Genetics and Biochemisty, Federal University of Uberlândia, Uberlândia, MG, Brazil
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Chambless LB, Parker SL, Hassam-Malani L, McGirt MJ, Thompson RC, Zhou T, Meng X, Xu B, Wei S, Chen X, De Witt Hamer PC, Robles SG, Zwinderman AH, Duffau H, Berger MS, Gonzalez JDSR, Alberto OV, Patricia HM, Chaichana K, Pendleton C, Chambless L, Nathan J, Camara-Quintana J, Li G, Harsh G, Thompson R, Lim M, Quinones-Hinojosa A, Oppenlander ME, Wolf A, Porter R, Nakaji P, Smith KA, Spetzler RF, Sanai N, Kim JH, Clark AJ, Jahangiri A, Sughrue ME, McDermott MW, Aghi MK, Chen C, Kasper E, Warnke P, Park CK, Lee SH, Song SW, Kim JW, Kim TM, Yamaguchi F, Omura T, Ten H, Ishii Y, Kojima T, Takahashi H, Teramoto A, Pereira EA, Livermore J, Ansorge O, Bojanic S, Meng X, Xu B, Chen X, Wei S, Zhou T, Tong H, Yu X, Zhou D, Hou Y, Zhou Z, Zhang J, Fabiano AJ, Rigual N, Munich S, Fenstermaker RA, Chen X, Meng X, Zhang J, Wang F, Zhao Y, Xu BN, Kim EH, Oh MC, Lee EJ, Kim SH, Kim YH, Kim CY, Kim YH, Han JH, Park CK, Kim SK, Paek SH, Wang KC, Kim DG, Jung HW, Chen X, Meng X, Wang F, Zhao Y, Xu BN, Krex D, Lindner C, Juratli T, Raue C, Schackert G, Valdes PA, Kim A, Leblond F, Conde OM, Harris BT, Paulsen KD, Wilson BC, Roberts DW, Krex D, Juratli T, Lindner C, Raue C, Schackert G, Occhiogrosso G, Cascardi P, Blagia M, De Tommasi A, Gelinas-Phaneuf N, Choudhury N, Al-Habib A, Cabral A, Nadeau E, Vincent M, Pazos V, Debergue P, DiRaddo R, Del Maestro RF, Guha-Thakurta N, Prabhu SS, Schulder M, Zavarella S, Nardi D, Schaffer S, Ruge MI, Grau S, Fuetsch M, Kickingereder P, Hamisch C, Treuer H, Voges J, Sturm V, Choy W, Yew A, Spasic M, Nagasawa D, Kim W, Yang I, Quigley MR, Hobbs J, Bhatia S, Cohen ZR, Shimon I, Hadani M, Carapella CM, Oppido PA, Vidiri A, Telera S, Pompili A, Villani V, Fabi A, Pace A, Cahill D, Wang M, Won M, Aldape K, Maywald R, Hegi M, Mehta M, Gilbert M, Sulman E, Vogelbaum M, Narayana A, Kunnakkat SD, Parker E, Gruber D, Gruber M, Knopp E, Zagzag D, Golfinos J, Dziurzynski K, Blas-Boria D, Suki D, Cahill D, Prabhu S, Puduvalli V, Levine N, Bloch O, Han SJ, Kaur G, Aghi MK, McDermott MW, Berger MS, Parsa AT, Quigley MR, Fukui O, Chew B, Bhatia S, DePowell JJ, Sanders-Taylor C, Guarnaschelli J, McPherson C, Sheth SA, Snuderl M, Kwon CS, Wirth D, Yaroslavsky A, Curry WT, Vogelbaum MA, Wang M, Hadjipanayis CG, Won M, Mehta MP, Gilbert MR, Megyesi JF, Macdonald D, Wang B, Pierre GHS, Hoover JM, Goerss SJ, Kaufmann TJ, Meyer FB, Parney IF, Guthikonda B, Thakur J, Khan I, Ahmed O, Shorter C, Wilson J, Welsh J, Cuellar H, Jeroudi M. SURGICAL THERAPIES. Neuro Oncol 2011; 13:iii154-iii163. [PMCID: PMC3222965 DOI: 10.1093/neuonc/nor164] [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: 12/04/2023] Open
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Nagasawa DT, Bergsneider M, Kelly D, Shafa B, Duong D, Ausman J, Liau L, McBride D, Yang I, Mann BS, Yabroff R, Harlan L, Zeruto C, Abrams J, Gondi V, Eickhoff J, Tome WA, Kozak KR, Mehta MP, Field KM, Drummond K, Yilmaz M, Gibbs P, Rosenthal MA, Allaei R, Johnson KJ, Hooten AJ, Kaste E, Ross JA, Largaespada DA, Johnson DR, O'Neill BP, Rice T, Zheng S, Xiao Y, Decker PA, McCoy LS, Smirnov I, Patoka JS, Hansen HM, Wiemels JL, Tihan T, Prados MD, Chang SM, Berger MS, Pico A, Rynearson A, Voss J, Caron A, Kosel ML, Fridley BL, Lachance DH, O'Neill BP, Giannini C, Wiencke JK, Jenkins RB, Wrensch MR, Xiao Y, Decker PA, Rice T, Hansen HM, Wiemels JL, Tihan T, Prados MD, Chang SM, Berger MS, Kosel ML, Fridley BL, Lachance DH, O'Neill BP, Buckner JC, Burch PA, Thompson RC, Nabors LB, Olson JJ, Brem S, Madden MH, Browning JE, Wiencke JK, Egan KM, Jenkins RB, Wrensch MR, Pereira EA, Livermore J, Alexe DM, Ma R, Ansorge O, Cadoux-Hudson TA, Johnson DR, O'Neill BP, Wang M, Dignam J, Won M, Curran W, Mehta M, Gilbert M, Terry AR, Barker FG, Leffert LR, Bateman B, Souter I, Plotkin SR, Ishaq O, Montgomery J, Terezakis S, Wharam M, Lim M, Holdhoff M, Kleinberg L, Redmond K, Kruchko C, Paker AM, Chi TL, Kamiya-Matsuoka C, Loghin ME, Lautenschlaeger T, Dedousi-Huebner V, Chakravarti A. EPIDEMIOLOGY. Neuro Oncol 2011. [DOI: 10.1093/neuonc/nor149] [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: 11/14/2022] Open
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Paiva JB, Penha Filho RAC, Pereira EA, Lemos MVF, Barrow PA, Lovell MA, Berchieri A. The contribution of genes required for anaerobic respiration to the virulence of Salmonella enterica serovar Gallinarum for chickens. Braz J Microbiol 2009; 40:994-1001. [PMID: 24031452 PMCID: PMC3768590 DOI: 10.1590/s1517-838220090004000035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 04/24/2009] [Accepted: 05/15/2009] [Indexed: 12/02/2022] Open
Abstract
Salmonella enterica serovar Gallinarum (SG) is an intracellular pathogen of chickens. To survive, to invade and to multiply in the intestinal tract and intracellularly it depends on its ability to produce energy in anaerobic conditions. The fumarate reductase (frdABCD), dimethyl sulfoxide (DMSO)-trimethylamine N-oxide (TMAO) reductase (dmsABC), and nitrate reductase (narGHIJ) operons in Salmonella Typhimurium (STM) encode enzymes involved in anaerobic respiration to the electron acceptors fumarate, DMSO, TMAO, and nitrate, respectively. They are regulated in response to nitrate and oxygen availability and changes in cell growth rate. In this study mortality rates of chickens challenged with mutants of Salmonella Gallinarum, which were defective in utilising anaerobic electron acceptors, were assessed in comparison to group of bird challenged with wild strain. The greatest degree of attenuation was observed with mutations affecting nitrate reductase (napA, narG) with additional attenuations induced by a mutation affecting fumarate reductase (frdA) and a double mutant (dmsA torC) affecting DMSO and TMAO reductase.
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Affiliation(s)
- J B Paiva
- Faculdade de Ciências Agrárias e Veterinárias , Universidade Estadual Paulista, Jaboticabal, SP , Brasil
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Pereira EA, Muthusamy KA, De Pennington N, Joint CA, Aziz TZ. Deep brain stimulation of the pedunculopontine nucleus in Parkinson's disease. Preliminary experience at Oxford. Br J Neurosurg 2009; 22 Suppl 1:S41-4. [DOI: 10.1080/02688690802448335] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Isoldi MC, Pereira EA, Visconti MA, Castrucci AML. The role of calcium, calcium-activated K+ channels, and tyrosine/kinase in psoralen-evoked responses in human melanoma cells. Braz J Med Biol Res 2004; 37:559-68. [PMID: 15064819 DOI: 10.1590/s0100-879x2004000400013] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
8-Methoxy psoralen (8-MOP) exerts a short-term (24 h) mitogenic action, and a long-term (48-72 h) anti-proliferative and melanogenic action on two human melanoma cell lines, SK-Mel 28 and C32TG. An increase of intracellular calcium concentration was observed by spectrofluorometry immediately after the addition of 0.1 mM 8-MOP to both cell lines, previously incubated with calcium probe fluo-3 AM (5 micro M). The intracellular Ca2+ chelator BAPTA/AM (1 micro M) blocked both early (mitogenic) and late (anti-proliferative and melanogenic) 8-MOP effects on both cell lines, thus revealing the importance of the calcium signal in both short- and long-term 8-MOP-evoked responses. Long-term biological assays with 5 and 10 mM tetraethylammonium chloride (TEA, an inhibitor of Ca2+-dependent K+ channels) did not affect the responses to psoralen; however, in 24-h assays 10 mM TEA blocked the proliferative peak, indicating a modulation of Ca2+-dependent K+ channels by 8-MOP. No alteration of cAMP basal levels or forskolin-stimulated cAMP levels was promoted by 8-MOP in SK-Mel 28 cells, as determined by radioimmunoassay. However, in C32TG cells forskolin-stimulated cAMP levels were further increased in the presence of 8-MOP. In addition, assays with 1 micro M protein kinase C and calcium/calmodulin-dependent kinase inhibitors, Ro 31-8220 and KN-93, respectively, excluded the participation of these kinases in the responses evoked by 8-MOP. Western blot with antibodies anti-phosphotyrosine indicated a 92% increase of the phosphorylated state of a 43-kDa band, suggesting that the phosphorylation of this protein is a component of the cascade that leads to the increase of tyrosinase activity.
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Affiliation(s)
- M C Isoldi
- Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Sao Paulo, SP, Brazil
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Shenoy MA, Pereira EA, Parikh PF. Aromatic polyesters based on bisphenol-A for liquid insulating systems: A synthetic approach. J Appl Polym Sci 2004. [DOI: 10.1002/app.21322] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Suzuki MS, Figueiredo RO, Castro SC, Silva CF, Pereira EA, Silva JA, Aragon GT. Sand bar opening in a coastal lagoon (Iquipari) in the northern region of Rio De Janeiro State: hydrological and hydrochemical changes. BRAZ J BIOL 2002; 62:51-62. [PMID: 12185923 DOI: 10.1590/s1519-69842002000100007] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [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] Open
Abstract
The aim of this paper was to verify hydrological and hydrochemical changes in the Iquiparí Lagoon water column, during three months, as related to an artificial sand bar opening. A drastic reduction in water volume occurred 28 hours after the sand bar opening, exposing the bottom sediment. This was densely colonized by submerged aquatic plants, which were dominant in the ecosystem metabolism, specially near the sand bar. An increase in salinity values, and dissolved and total nutrient concentrations, was observed during the sand bar opening period. In contrast, chlorophyll a concentration decreased. These changes were associated with: 1) mix of remained brackish and marine waters; 2) nutrient release from sediments by physical processes; and 3) submerged plant death. After the sand bar closure, lagoon metabolism was completely regulated by a dense phytoplankton community. We observed that the sand bar opening resulted in an extensile replacement of the lagoon's water and a change in the community mainly responsible for the ecosystem metabolism.
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Affiliation(s)
- M S Suzuki
- Laboratório de Ciências Ambientais, Universidade Estadual do Norte Fluminense (UENF), Av. Alberto Lamego, 2000, CEP 28015-620, Campos dos Goytacazes, RJ, Brazil.
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Pereira EA, Masagão RA, Lucia A, Lima LM, Amatuzzi MM. [Pyoarthritis of the knee--caseload of the Hospital das Clínicas da FMUSP 1990-1994 (86 cases)]. Rev Hosp Clin Fac Med Sao Paulo 1995; 50:317-319. [PMID: 8731252] [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: 05/22/2023]
Abstract
The authors performed a prospective study of 86 patients with septic arthritis of the knee between 1990 e 1994. The age, sex, predisposing factors, time between onset of symptoms and treatment, etiologic organism and their route of entrance in the joint, previous use of antibiotic the data from of treatment, stay at the hospital and complications were evaluated and compared with the literature.
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Affiliation(s)
- E A Pereira
- Faculdade de Medicina da Universidade de São Paulo
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Machado MA, Pereira EA, Lourenção JL, Branco PD. [Acute abdomen in elderly patients]. Rev Hosp Clin Fac Med Sao Paulo 1990; 45:15-21. [PMID: 2133165] [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: 12/30/2022]
Abstract
Seventy nine elderly patients with acute abdominal conditions were operated on in the Emergency Service of the Hospital das Clinicas of the University of São Paulo from 1981 to 1985. Total mortality rate was 58.23%. In patients with acute vascular abdominal conditions it was 100%, in inflammatory conditions 55.17% and in intestinal obstruction 47.83%. The lowest mortality was observed in traumatic conditions (27.27%). Procrastination of operations was followed by higher mortality. In operations lasting more than three hours the mortality was significantly higher than in those lasting less than three hours. Associated diseases as well as reoperations increased the postoperative mortality.
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Affiliation(s)
- M A Machado
- Discplina e Cirurgia do Trauma, Faculdade de Medicina, Universidade de São Paulo
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Salata E, Yoshida EL, Pereira EA, Correa FM. [Toxoplasmosis in wild and domestic animals of the Botucatu region, State of São Paulo, Brazil]. Rev Inst Med Trop Sao Paulo 1985; 27:20-2. [PMID: 3898317 DOI: 10.1590/s0036-46651985000100004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Os Autores analisaram soros de 47 Cannis familiaris, de 9 Felis cattus, de 64 Didelphis marsupialis aurita, de 9 Dasypus novemcinctus, de 4 Cabassous tatouay e de 29 Rattus rattus, através da reação de imunofluorescência indireta, para pesquisar a presença de anticorpos anti Toxoplasma gondii. Estes foram encontrados apenas em C. familiaris (63,8%) e em D. m. aurita (4,7%). Frente aos resultados obtidos, os Autores sugerem que novas pesquisas nesta área sejam realizadas, para que se conheça melhor a importância epidemiológica de várias espécies animais na disseminação da toxoplasmose.
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