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Váňa V, Lipový B, Vacek L, Pavelka A, Janda L, Holoubek J. Two faces of the antimicrobial peptides and their relevance to burn wound infection. Burns 2024:S0305-4179(24)00155-4. [PMID: 38777668 DOI: 10.1016/j.burns.2024.05.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Accepted: 05/09/2024] [Indexed: 05/25/2024]
Affiliation(s)
- V Váňa
- Department of Burns and Plastic Surgery, Institution shared with University Hospital Brno, Faculty of Medicine, Masaryk University, Jihlavska 20, 625 00 Brno, Czech Republic.
| | - B Lipový
- Department of Burns and Plastic Surgery, Institution shared with University Hospital Brno, Faculty of Medicine, Masaryk University, Jihlavska 20, 625 00 Brno, Czech Republic; Advanced Biomaterials Group, Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - L Vacek
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
| | - A Pavelka
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
| | - L Janda
- Department of Infectious Diseases and Preventive Medicine, Veterinary Research Institute, Hudcova 296/70, 621 00 Brno, Czech Republic
| | - J Holoubek
- Department of Burns and Plastic Surgery, Institution shared with University Hospital Brno, Faculty of Medicine, Masaryk University, Jihlavska 20, 625 00 Brno, Czech Republic.
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Šťastná M, Norek A, Řádková J, Sluková M, Hrunka M, Jabandžiev P, Janda L. Increasing prevalence of celiac disease - where to look for answers? Epidemiol Mikrobiol Imunol 2023; 72:172-183. [PMID: 37871991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Celiac disease or gluten-sensitive enteropathy is a relevant health concern in today's world. Three prerequisites need to be met to trigger the disease, namely a genetic predisposition, gluten consumption, and environmental factors. Retrospective studies conducted across all age groups have ruled out the possibility that improved diagnostic methods were behind the increased prevalence. Since the genetic predisposition is more or less constant in the population, it is assumed that external factors may play a major role in this increase. Although it is generally believed that modern wheat varieties are to be blamed for the increase in gluten intolerance-related diseases, this assumption is refuted based on the analysis of the current and 100-year-old varieties. However, the increased prevalence could be related to modern lifestyles, changes in food preparation technology or composition, disruption of the intestinal barrier in viral disease, and other factors leading to intestinal dysbiosis. A possible preventive strategy in predisposed individuals could be the avoidance of gluten from the diet when ill, especially with a viral infection. This article openup a new perspective on the currently common autoimmune disease.
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Cuesta MJ, Sánchez-Torres AM, Moreno-Izco L, García de Jalón E, Gil-Berrozpe GJ, Zarzuela A, Peralta V, Ballesteros A, Fañanás L, Hernández R, Janda L, Lorente R, Papiol S, Peralta D, Ribeiro M, Rosero A, Zandio M. Neurocognitive correlates of the varied domains of outcomes at 20 year follow-up of first-episode psychosis. Psychiatry Res 2022; 318:114933. [PMID: 36334328 DOI: 10.1016/j.psychres.2022.114933] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 10/18/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
Abstract
Little is known about long-term outcomes of the first episode of psychosis (FEP) other than in the symptomatic domain. We hypothesised that cognitive impairment is associated with poorer multi-domain outcomes at a long-term follow-up of FEP patients. We followed-up 172 FEP patients for a mean of 20.3 years. Ten outcome dimensions were assessed (symptomatic, functional and personal recovery, social disadvantage, physical health, suicide attempts, number of episodes, current drug use, chlorpromazine equivalent doses (CPZ), and schizophrenia/schizoaffective disorder final diagnosis). Cognition was assessed at follow-up. Processing speed and verbal memory deficits showed significant associations with poor outcomes on symptomatic, social functioning, social disadvantage, higher number of episodes, and higher CPZ. Significant associations were found between visual memory impairments were significantly associated with low symptomatic and functional recovery, between attentional deficits and a final diagnosis of schizophrenia/schizoaffective disorder, and between social cognition deficits and poor personal recovery.Lower cognitive global scores were significantly associated with all outcome dimensions except for drug abuse and physical status. Using multiple outcome dimensions allowed for the inclusion of the patients' perspective and other commonly neglected outcome measures. Taken together, cognitive impairment in FEP patients is strongly related to poor performance on several outcome dimensions beyond symptomatic remission.
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Affiliation(s)
- M J Cuesta
- Department of Psychiatry, Hospital Universitario de Navarra, Pamplona, Spain; Navarra Institute for Health Research (IdiSNA), Pamplona, Spain.
| | - A M Sánchez-Torres
- Department of Psychiatry, Hospital Universitario de Navarra, Pamplona, Spain; Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - L Moreno-Izco
- Department of Psychiatry, Hospital Universitario de Navarra, Pamplona, Spain; Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - E García de Jalón
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain; Mental Health Department, Servicio Navarro de Salud, Pamplona, Spain
| | - G J Gil-Berrozpe
- Department of Psychiatry, Hospital Universitario de Navarra, Pamplona, Spain; Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - A Zarzuela
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain; Mental Health Department, Servicio Navarro de Salud, Pamplona, Spain
| | - V Peralta
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain; Mental Health Department, Servicio Navarro de Salud, Pamplona, Spain
| | - A Ballesteros
- Red de Salud Mental de Álava, Vitoria-Gasteiz, Spain
| | - L Fañanás
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Biomedicine Institute of the University of Barcelona (IBUB), Barcelona, Spain; Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Spain
| | - R Hernández
- CSMIJ Ciutat Vella. Consorci Parc de Salut Mar, Barcelona, Spain
| | - L Janda
- Mental Health Department, Servicio Navarro de Salud, Pamplona, Spain
| | - R Lorente
- Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - S Papiol
- Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Spain; Institute of Psychiatric Phenomics and Genomics (IPPG), University Hospital, LMU Munich, Munich, 80336, Germany; Department of Psychiatry and Psychotherapy, University Hospital, LMU Munich, Munich, 80336, Germany
| | - D Peralta
- Mental Health Department, Servicio Navarro de Salud, Pamplona, Spain
| | - M Ribeiro
- Department of Psychiatry, Hospital Universitario de Navarra, Pamplona, Spain; Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
| | - A Rosero
- Mental Health Department, Servicio Navarro de Salud, Pamplona, Spain
| | - M Zandio
- Department of Psychiatry, Hospital Universitario de Navarra, Pamplona, Spain; Navarra Institute for Health Research (IdiSNA), Pamplona, Spain
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Raška F, Lipový B, Holoubek J, Kobzová Š, Vacek L, Vojtová L, Janda L. Promising effect of topical antimicrobial biobetters against methicillin-resistant Staphylococcus aureus strains. Burns 2022; 48:1770-1772. [DOI: 10.1016/j.burns.2022.08.011] [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] [Received: 08/08/2022] [Revised: 08/17/2022] [Accepted: 08/22/2022] [Indexed: 11/15/2022]
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Gil-Berrozpe G, Peralta V, Sánchez-Torres A, Moreno-Izco L, Garcia De Jalon E, Peralta D, Janda L, Cuesta M. Psychopathological networks in psychosis and changes over time: A long-term cohort study of first-episode psychosis. Eur Psychiatry 2022. [PMCID: PMC9562945 DOI: 10.1192/j.eurpsy.2022.637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Introduction First-episode psychosis is a critical period for early interventions to reduce the risk of poor outcomes and relapse as much as possible. There are now many studies revealing the patterns of course in the short and medium terms, but uncertainties about the long-term outcomes of symptomatology remain to be ascertained. Objectives First, we ascertained whether the structure of psychopathological symptoms, dimensions and domains of psychopathology remains invariant over time between first-episode psychosis and long-term follow-up. Second, we analysed the changes in the interrelationships of psychopathological symptoms, dimensions and domains of psychopathology between FEP and long-term follow-up at three levels. Methods We performed network analysis to investigate first-episode and long-term stages of psychosis at three levels of analysis: micro, meso and macro. The sample was a cohort of 510 patients with first-episode psychoses from the SEGPEP study, who were reassessed at the long-term follow-up (n = 243). We used the Comprehensive Assessment of Symptoms and History (CASH) for their assessments. Results Our results showed a similar pattern of clustering between first episodes and long-term follow-up in seven psychopathological dimensions at the micro level, 3 and 4 dimensions at the meso level, and one at the macro level. They also revealed significant differences between first-episode and long-term network structure and centrality measures at the three levels. Conclusions Our findings suggest that disorganization symptoms have more influence in long-term stabilized patients. The main results of the current study add evidence to the hierarchical, dimensional and longitudinal structuring of first-episode psychoses. Disclosure No significant relationships.
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Sánchez-Torres A, Gil-Berrozpe G, Lorente-Omeñaca R, Zandio M, Moreno-Izco L, Janda L, Peralta D, Peralta V, Cuesta M. Cognitive impairment associated with psychosis (CIAPS): Validity of clinical criteria to detect cognitive impairment. Eur Psychiatry 2021. [PMCID: PMC9475864 DOI: 10.1192/j.eurpsy.2021.1390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Introduction Even though cognitive impairment is considered a hallmark of schizophrenia, it has not been included as a criterion into major diagnostic systems. Objectives To test whether a set of clinical-defined cognitive impairment criteria can have utility in the assessment of psychosis patients in clinical practice. Methods We assessed 98 patients with a psychotic disorder, diagnosed using DSM 5 criteria. We developed a set of cognitive impairment associated with psychosis (CIAPs) criteria following the format of current DSM criteria and based on previous literature. The CIAPs criteria include: A) criterion for evidence of cognitive impairment after the beginning of illness; B) cognitive impairment clinically evidenced, affecting functioning in everyday activities in at least two out of six cognitive domains; C) and D) exclusion criterion for either delirium or other neurocognitive disorders, respectively, as causal agents of the cognitive impairment. The psychosis patients dichotomized by the CIAPs criteria were tested regarding the neuropsychological performance in attention, speed of processing, verbal memory, visual memory, working memory, executive function and social cognition tasks. Also a Global Cognitive Index was calculated. Results Forty-three patients with psychosis fulfilled the CIAPs criteria (43.9%). MANOVA profile analyses revealed a pattern of statistically significant deficits in all the cognitive dimensions except for social cognition in CIAPs+ patients regarding CIAPS-, with prominent deficits in processing speed and memory functions.![]() Conclusions The CIAPs criteria could be an auxiliary method for clinicians to assess cognitive impairment. It may also permit clinical estimation of the influence of cognitive deficits on the ecological functioning of patients. Conflict of interest This work was supported by the Government of Navarra (grants 17/31, 18/41, 87/2014) and the Carlos III Health Institute (FEDER Funds) from the Spanish Ministry of Economy and Competitivity (14/01621 and 16/02148). Both had no further role in the study des
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Kobzová Š, Vacek L, Lipový B, Hanslianová M, Vojtová L, Janda L. Enzyme-based treatment of skin and soft tissue infections. Epidemiol Mikrobiol Imunol 2021; 70:52-61. [PMID: 33853338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Inflammatory diseases of the skin and soft tissues are an important group of human infections. The most common causes are the bacteria Staphylococcus aureus and Streptococcus pyogenes. Given the growing resistance of these pathogens to antimicrobials, the current research focuses on the search for novel therapeutic options that would be effective against infections refractory to conventional antimicrobials. A promising alternative is the use of enzyme-based antimicrobials (enzybiotics) that degrade the bacterial cell wall. They target the specific pathogen but do not affect the skin microbiome, thus helping the healing process. As enzymes can be poorly soluble, unstable, or subject to rapid elimination from the body, efforts are made to create biobetters, i.e., enzymes with improved characteristics. Emphasis is also put on the development of novel enzybiotic carriers or wound healing dressings with integrated enzymes.
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Marek J, Klumpler T, Pekarova B, Borkovcova P, Hejatko J, Janda L. Structure of CKI1 RD, the receiver domain of the histidine kinase CKI1 from Arabidopsis thaliana. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308089782] [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: 11/11/2022] Open
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Janda L, Pavelka T, Tichý P, Spížek J, Petříček M. Production and properties of ααα‐glucosidase from the thermotolerant bacterium
Thermomonospora curvata. J Appl Microbiol 2003. [DOI: 10.1046/j.1365-2672.1997.00245.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- L. Janda
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, CzechRepublic
| | - T. Pavelka
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, CzechRepublic
| | - P. Tichý
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, CzechRepublic
| | - J. Spížek
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, CzechRepublic
| | - M. Petříček
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, CzechRepublic
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Janda L, Damborský J, Rezniczek GA, Wiche G. Plectin repeats and modules: strategic cysteines and their presumed impact on cytolinker functions. Bioessays 2001; 23:1064-9. [PMID: 11746222 DOI: 10.1002/bies.1151] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [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: 01/26/2023]
Abstract
Plectin, a member of the cytolinkers protein family, plays a crucial role in cells as a stabilizing element of cells against mechanical stress. Its absence results in muscular dystrophy, skin blistering, and signs of neuropathy. The C-terminal domain of plectin contains several highly homologous repeat domains that also occur in other cytolinkers. Secondary structure analysis revealed that the building block of these domains, the PLEC repeat, is similar to the ankyrin repeat. We present a model that attempts to explain how the C-terminal domain, which comprises approximately 1900 amino acid, could be stabilized to maintain its structural integrity even under extensive mechanical stress. In this model, larger solenoid modules formed from PLEC repeats can be disulfide-bridged via conserved cysteines. Our hypothesis suggests that this process could be mediated by cytoplasmic NOS-generated products, such as the radical peroxynitrite. Reinforcement of molecular structure would provide a rationale why during exercising or physical stress radicals are formed without necessarily being deleterious. This article contains supplementary material that may be viewed at the BioEssays website at http://www.interscience.wiley.com/jpages/0265-9247/suppmat/23/v23_11.1064.html.
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Affiliation(s)
- L Janda
- Institute of Biochemistry and Molecular Cell Biology, University of Vienna, Austria
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Janda L, Damborský J, Petrícek M, Spízek J, Tichý P. Molecular characterization of the Thermomonospora curvata aglA gene encoding a thermotolerant alpha-1,4-glucosidase. J Appl Microbiol 2000; 88:773-83. [PMID: 10792537 DOI: 10.1046/j.1365-2672.2000.01019.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 11/20/2022]
Abstract
The cloning, sequencing and structural characterization of a gene encoding a thermostable alpha-1,4-glucosidase from Thermomonospora curvata is described. DNA sequence analysis revealed four open reading frames designated aglA, aglR, aglE and aglF. The aglA gene encodes a thermostable alpha-1,4-glucosidase from T. curvata and is situated between two genes, aglR and aglE. Genes aglA, aglE and aglF are transcribed in the same direction, while aglR is transcribed in the opposite direction. By comparing the amino acid sequence of the alpha-1,4-glucosidase from T. curvata with other alpha-glucanases, it appears that the enzyme is a member of the alpha-amylase family. The proteins of this family have an (alpha/beta)8 barrel super secondary structure. The topology of the alpha-1,4-glucosidase was predicted by computer-assisted analysis. The topology of the secondary structures of the alpha-1,4-glucosidase resembles the structure of barley alpha-amylase, but the primary structure resembles most closely the oligo-1,6-glucosidase from Bacillus cereus. Putative catalytic residues (D221, E281 and D343) and calcium binding residues (N116, E179, D191, H224 or G225) are proposed.
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Affiliation(s)
- L Janda
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague and Laboratory of Biomolecular Structure and Dynamics, Faculty of Science, Masaryk University, Brno, Czech Republic
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Nemec A, Janda L, Melter O, Dijkshoorn L. Genotypic and phenotypic similarity of multiresistant Acinetobacter baumannii isolates in the Czech Republic. J Med Microbiol 1999; 48:287-296. [PMID: 10334596 DOI: 10.1099/00222615-48-3-287] [Citation(s) in RCA: 51] [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: 11/18/2022] Open
Abstract
The diversity of 103 clinical isolates of the Acinetobacter calcoaceticus-Acinetobacter baumannii complex obtained between 1991 and 1997 from 17 Czech hospitals was studied by ribotyping, biotyping, plasmid profiling and antibiotic susceptibility testing. According to the EcoRI ribotypes, all but one of these isolates were identified to the DNA group level: 77 isolates were allocated to DNA group 2 (A. baumannii), 14 to DNA group 3, 10 to DNA group 13 sensu Tjernberg and Ursing and one to DNA group 1 (A. calcoaceticus). In total, 50 different EcoRI ribotypes and 10 biotypes were observed. Plasmids were found in 92% of the isolates and a high variability in plasmid profiles was found in isolates of the same DNA group. The combination of typing profiles allowed two predominant groups (termed A and B) to be distinguished among the A. baumannii isolates (37 and eight isolates, respectively) that shared a specific ribotype and were highly similar in other properties. These two groups comprised both sporadic and outbreak isolates and were found in most localities. Group A and B isolates were markedly more resistant to antibiotics than most of the remaining isolates, thus representing 85% of all multiresistant isolates. The features of groups A and B corresponded to those of two epidemic clones identified recently among hospital strains in north-western Europe.
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Affiliation(s)
- A Nemec
- National Institute of Public Health, Srobárova 48, 100 42 Prague 10
| | - L Janda
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - O Melter
- National Institute of Public Health, Srobárova 48, 100 42 Prague 10
| | - Lenie Dijkshoorn
- Department of Medical Microbiology, Leiden University Medical Centre, Leiden, The Netherlands
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Lovejoy DW, Ball JD, Keats M, Stutts ML, Spain EH, Janda L, Janusz J. Neuropsychological performance of adults with attention deficit hyperactivity disorder (ADHD): diagnostic classification estimates for measures of frontal lobe/executive functioning. J Int Neuropsychol Soc 1999; 5:222-33. [PMID: 10217922 DOI: 10.1017/s1355617799533055] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.8] [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: 11/07/2022]
Abstract
ADHD adults (N = 26) were compared to normal controls (N = 26) on 6 neuropsychological measures believed sensitive to frontal lobe-executive functioning. MANOVA analyses and subsequent univariate tests indicated that most of the neuropsychological measures discriminated between the two groups. To address clinical significance diagnostic classification rates were also generated for each measure individually, and for the battery as a whole. Levels of positive predictive power (PPP) for each of the 6 measures (83-100%) indicated that abnormal scores on these tests were good predictors of ADHD. However, estimates of negative predictive power (NPP) suggested that normal scores poorly predicted the absence of ADHD. When classification rates were calculated for the overall battery classification accuracy improved substantially. Thus, neuropsychological tests can differentiate adults suffering from ADHD from adults without ADHD, while also providing good classification accuracy. Finally, the pattern of neurobehavioral impairments exemplified through the Summary Index scores was interpreted as consistent with conceptualizations of ADHD depicting mild neurologic dysfunction in networks associated with the frontal lobes.
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Pospísil S, Benada O, Kofronová O, Petrícek M, Janda L, Havlícek V. Kytococcus sedentarius (formerly Micrococcus sedentarius) and Dermacoccus nishinomiyaensis (formerly Micrococcus nishinomiyaensis) produce monensins, typical Streptomyces cinnamonensis metabolites. Can J Microbiol 1998; 44:1007-11. [PMID: 9933918 DOI: 10.1139/cjm-44-10-1007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The environmental isolate Kytococcus sedentarius TR-2 was found to be a new producer of the oligoketide antibiotics monensin A and B. Electron microscopic studies demonstrated that the TR-2 strain had coccoid cells and DNA analysis revealed no close relationship to Streptomyces cinnamonensis, a typical monensin producer. Production of monensins was also proven with six culture collection K. sedentarius strains and three Dermacoccus nishinomiyaensis strains. The secondary metabolism of micrococci demonstrates a high degree of instability. Biosynthesis of monensins by micrococci endorses a phylogenetic relationship to Streptomyces spp.
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Affiliation(s)
- S Pospísil
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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Pospísil S, Benada O, Kofronová O, Petrícek M, Janda L, Havlícek V. Kytococcus sedentarius (formerly Micrococcus sedentarius) and Dermacoccus nishinomiyaensis (formerly Micrococcus nishinomiyaensis) produce monensins, typical Streptomyces cinnamonensis metabolites. Can J Microbiol 1998. [DOI: 10.1139/w98-081] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The environmental isolate Kytococcus sedentarius TR-2 was found to be a new producer of the oligoketide antibiotics monensin A and B. Electron microscopic studies demonstrated that the TR-2 strain had coccoid cells and DNA analysis revealed no close relationship to Streptomyces cinnamonensis, a typical monensin producer. Production of monensins was also proven with six culture collection K. sedentarius strains and three Dermacoccus nishinomiyaensis strains. The secondary metabolism of micrococci demonstrates a high degree of instability. Biosynthesis of monensins by micrococci endorses a phylogenetic relationship to Streptomyces spp.Key words: Kytococcus sedentarius, Dermacoccus nishinomiyaensis, Streptomyces cinnamonensis, monensins, phylogenesis.
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Abstract
The gene pkwA coding for a typical WD-repeat protein was found in the chromosome of the bacterium Thermomonospora curvata CCM 3352. Until now WD-repeat proteins were through to be confined to eukaryotes.
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Affiliation(s)
- L Janda
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague
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Mokrosz JL, Duszyńska B, Charakchieva-Minol S, Bojarski AJ, Mokrosz MJ, Wydra RL, Janda L, Strekowski L. Structure-activity relationship studies of CNS agents. Part 29. N-Methylpiperazino-substituted derivatives of quinazoline, phthalazine and quinoline as novel α1, 5-HT1A and 5-HT2A receptor ligands. Eur J Med Chem 1996. [DOI: 10.1016/s0223-5234(97)86176-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhao M, Janda L, Nguyen J, Strekowski L, Wilson WD. The interaction of substituted 2-phenylquinoline intercalators with poly(A).poly(U): classical and threading intercalation modes with RNA. Biopolymers 1994; 34:61-73. [PMID: 7509202 DOI: 10.1002/bip.360340108] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The interaction of a series of 2-phenylquinoline derivatives with RNA was investigated by means of viscometric, pKa, spectroscopic, binding, Tm, and kinetic methods. Compounds 1, 2, and 3 have a piperazyl substituent at the para, meta, or ortho position, respectively, while 4 has an unsubstituted phenyl ring. The pKa results suggest that 1 has three charges, 2 and 3 have more than two charges, and 4 has two charges at pH 6.2. Spectroscopic and Tm results indicate that 1 binds more strongly to RNA than 2-4. Kinetic and modeling results indicate that 1 is a threading intercalator while 2 and 4 are classical intercalators. All experimental results indicate that 3, which has a large twist between the phenyl and quinoline rings, binds weakly with RNA.
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Affiliation(s)
- M Zhao
- Department of Chemistry, Georgia State University, Atlanta 30303
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