RESUMEN
Nine-month-olds start to perform sequential actions. Yet, it remains largely unknown how they acquire and control such actions. We studied infants' sequential-action control by employing a novel gaze-contingent eye tracking paradigm. Infants experienced occulo-motor action sequences comprising two elementary actions. To contrast chaining, concurrent and integrated models of sequential-action control, we then selectively activated secondary actions to assess interactions with the primary actions. Behavioral and pupillometric results suggest 12-month-olds acquire sequential action without elaborate strategy through exploration. Furthermore, the inhibitory mechanisms ensuring ordered performance develop between 9 and 12 months of age, and are best captured by concurrent models.
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Desarrollo Infantil , Cognición , Movimiento , Desempeño Psicomotor , Medidas del Movimiento Ocular , Femenino , Humanos , Lactante , Inhibición Psicológica , MasculinoRESUMEN
PURPOSE: To use the World Health Organization's International Classification of Functioning, Disability and Health (ICF) to explore the experiences of women living with self-identified HIV-associated neurocognitive challenges. METHOD: This interpretive, qualitative study involved key informant interviews with 16 women with self-identified HIV-associated neurocognitive challenges. Data were collected through 60-90 min, in-depth, semi-structured interviews. Thematic analysis was performed using an inductive approach. Theoretical analysis then used the ICF to reconceptualize the data using a disability lens. RESULTS: Participants perceived impairments (e.g. memory loss, difficulty multi-tasking) and participation restrictions (e.g. parenting, work roles) resulting from their neurocognitive challenges as having a larger impact on their daily lives than activity limitations (e.g. difficulty with chores). Participants held contrasting views about parenting: women with children drew strength from parenting whereas women without children worried that parenting could compromise their health. Participation in work and volunteering roles was viewed as integral to managing neurocognitive challenges and health overall. CONCLUSIONS: Conceptualizing neurocognitive challenges through a disability lens focuses attention on how impairments interact with other realities in these women's lives. This exploratory study reveals the need for future research exploring perceptions among people living with HIV-associated neurocognitive challenges with attention to aging and among other vulnerable groups.
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Trastornos del Conocimiento/etiología , Trastornos del Conocimiento/psicología , Personas con Discapacidad/psicología , Infecciones por VIH/complicaciones , Infecciones por VIH/psicología , Calidad de Vida/psicología , Actividades Cotidianas/psicología , Adulto , Canadá , Cognición , Trastornos del Conocimiento/virología , Evaluación de la Discapacidad , Fatiga/etiología , Fatiga/psicología , Femenino , Infecciones por VIH/tratamiento farmacológico , Infecciones por VIH/virología , Necesidades y Demandas de Servicios de Salud , Humanos , Clasificación Internacional de Enfermedades , Entrevistas como Asunto , Trastornos de la Memoria/etiología , Trastornos de la Memoria/psicología , Memoria a Corto Plazo , Persona de Mediana Edad , Investigación Cualitativa , Organización Mundial de la Salud , Adulto JovenRESUMEN
The Gram-positive soil-borne streptomycetes exhibit a complex life cycle that is controlled by extracellular regulatory molecules. One interesting autoregulator is the protein factor C, originally isolated from the culture fluid of S. albidoflavus 45H. Southern hybridizations and database searches revealed that although homologues of factor C are not present in most Streptomyces strains, an exception is the plant pathogenic S. scabies , which causes common scab disease on potato. In S. scabies and related strains pathogenicity involves a large pathogenicity island that carries thaxtomin biosynthetic genes, the nec1 necrogenic factor and other putative virulence genes. Extracellular enzymes, including extracellular esterases, that attack the surface of the tubers and disintegrate the external protective layer are also known to be involved in pathogenicity. In S. albidoflavus 45H, factor C coordinates the expression of many secreted hydrolases. To find out whether esterase is also regulated by factor C, we made a factor C null mutant of strain 45H. The mutant showed a bald phenotype and was impaired in pathogenicity and esterase activity. This is a first indication that extracellular regulatory factors may play a role in the development of potato scab.
Asunto(s)
Proteínas Bacterianas/toxicidad , Enfermedades de las Plantas/etiología , Enfermedades de las Plantas/microbiología , Streptomyces/patogenicidad , Proteínas Bacterianas/genética , Esterasas/genética , Esterasas/toxicidad , Genes Bacterianos , Mutación , Solanum tuberosum/microbiología , Streptomyces/enzimología , Streptomyces/genética , Virulencia/genética , Virulencia/fisiologíaRESUMEN
OBJECTIVES: We sought to determine whether sauna therapy, a thermal vasodilation therapy, improves endothelial function in patients with coronary risk factors such as hypercholesterolemia, hypertension, diabetes mellitus and smoking. BACKGROUND: Exposure to heat is widely used as a traditional therapy in many different cultures. We have recently found that repeated sauna therapy improves endothelial and cardiac function in patients with chronic heart failure. METHODS: Twenty-five men with at least one coronary risk factor (risk group: 38 +/- 7 years) and 10 healthy men without coronary risk factors (control group: 35 +/- 8 years) were enrolled. Patients in the risk group were treated with a 60 degrees C far infrared-ray dry sauna bath for 15 min and then kept in a bed covered with blankets for 30 min once a day for two weeks. To assess endothelial function, brachial artery diameter was measured at rest, during reactive hyperemia (flow-mediated endothelium-dependent dilation [%FMD]), again at rest and after sublingual nitroglycerin administration (endothelium-independent vasodilation [%NTG]) using high-resolution ultrasound. RESULTS: The %FMD was significantly impaired in the risk group compared with the control group (4.0 +/- 1.7% vs. 8.2 +/- 2.7%, p < 0.0001), while %NTG was similar (18.7 +/- 4.2% vs. 20.4 +/- 5.1%). Two weeks of sauna therapy significantly improved %FMD in the risk group (4.0 +/- 1.7% to 5.8 +/- 1.3%, p < 0.001). In contrast, %NTG did not change after two weeks of sauna therapy (18.7 +/- 4.2% to 18.1 +/- 4.1%). CONCLUSIONS: Repeated sauna treatment improves impaired vascular endothelial function in the setting of coronary risk factors, suggesting a therapeutic role for sauna treatment in patients with risk factors for atherosclerosis.
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Enfermedad de la Arteria Coronaria/epidemiología , Enfermedad de la Arteria Coronaria/terapia , Endotelio Vascular/fisiopatología , Calor/uso terapéutico , Baño de Vapor , Adulto , Fenómenos Biomecánicos , Enfermedad de la Arteria Coronaria/fisiopatología , Humanos , Masculino , Retratamiento , Factores de Riesgo , VasodilataciónRESUMEN
BACKGROUND: Understanding the precise molecular mechanisms underlying the phenomenon of restenosis after PTCA may help us to develop a new strategy for the treatment of restenosis after PTCA. The purpose of this study was to identify the genes involved in vascular restenosis. METHODS AND RESULTS: Applying a differential hybridization method to a model of the balloon-injured rabbit aorta, we identified 6 cDNA clones that were upregulated after injury. Northern blot showed that 5 genes, but not apolipoprotein J (apoJ)/clusterin, were constitutively expressed in noninjured aorta and upregulated after balloon injury. ApoJ mRNA was not detectable in noninjured aorta (control), began to be expressed at 6 hours after injury, showed a peak level at 24 hours (a 48-fold increase), gradually declined, and returned to the control level at 24 weeks. Western blot and immunohistochemistry demonstrated no expression of apoJ protein in noninjured aorta, an expression of apoJ at 2 days after balloon injury, and a peak level (a 55-fold increase) at 2 to 8 weeks. The expression of apoJ protein continued until 24 weeks after injury. In situ hybridization revealed that apoJ mRNA was expressed in smooth muscle cells (SMCs) of media at 2 days after injury and in SMCs of media and neointima at 2 weeks. To analyze the function of apoJ, stably transfected rabbit SMCs were created. The expression of apoJ stimulated proliferation and migration of SMCs. CONCLUSIONS: ApoJ is dramatically induced in media and neointima after vascular injury, suggesting that apoJ contributes to restenosis after angioplasty.
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Aorta/metabolismo , Enfermedades de la Aorta/metabolismo , Glicoproteínas/biosíntesis , Glicoproteínas/genética , Chaperonas Moleculares/biosíntesis , Chaperonas Moleculares/genética , Músculo Liso Vascular/metabolismo , Angioplastia Coronaria con Balón/efectos adversos , Animales , Aorta/lesiones , Aorta/patología , Enfermedades de la Aorta/etiología , Enfermedades de la Aorta/patología , Western Blotting , División Celular/efectos de los fármacos , Movimiento Celular/efectos de los fármacos , Células Cultivadas , Clusterina , Modelos Animales de Enfermedad , Perfilación de la Expresión Génica , Regulación de la Expresión Génica , Glicoproteínas/farmacología , Inmunohistoquímica , Hibridación in Situ , Masculino , Chaperonas Moleculares/farmacología , Datos de Secuencia Molecular , Músculo Liso Vascular/citología , Músculo Liso Vascular/efectos de los fármacos , ARN Mensajero/biosíntesis , Conejos , Análisis de Secuencia de ADNRESUMEN
Executive tasks typically contain a prepotent lure. In addition, they require individuals either to (a) follow arbitrary procedures or (b) update their model of the physical world. Recent research suggests that children with autism may be challenged only by executive tasks of the former kind (containing arbitrary rules). We asked whether this continues to be true when there is no prepotent lure, comparing performance on (a) a task with arbitrariness but without prepotency with (b) a task with both features and (c) a task with neither. The participants with autism performed at a lower level than comparison groups on the first and second task but not on the third task. This outcome is consistent with the view that autism is associated with difficulties in following arbitrary procedures per se. We try to locate difficulties with acting on the basis arbitrary rules in relation to more mainstream ideas about autistic executive dysfunction.
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Trastorno Autístico/psicología , Trastornos del Conocimiento/diagnóstico , Adolescente , Adulto , Niño , Preescolar , Femenino , Humanos , Masculino , Pruebas Neuropsicológicas , Índice de Severidad de la EnfermedadRESUMEN
OBJECTIVE: Dystrophin provides mechanical reinforcement to the membranes of myocytes. Dystrophin abnormalities are known to cause cardiomyopathy and skeletal muscle disorders; however, the pathogenesis of these abnormalities remains unclear. Dystrophin-deficient skeletal muscle is vulnerable to stresses such as stretch and hypo-osmotic shock. We investigated whether the myocardium of dystrophin-deficient (mdx) mice shows increased vulnerability to acute pressure overload in vivo. METHODS AND RESULTS: Abdominal aortic banding was performed in 12-week-old mdx and control mice. The aortic pressure was measured by cannulation of the right carotid artery at the time of sacrifice. Systolic pressures in mdx mice at 0, 1, 2, 7 and 14 days after aortic banding were 100 +/- 11, 119 +/- 7, 123 +/- 4, 134 +/- 11 and 130 +/- 10 mmHg, respectively. Microscopic analysis revealed focal lesions in the left ventricular wall in banded mdx mice. These lesions consisted of damaged myocytes and inflammatory cells, and also of fibrosis at a late stage. Similar lesions were not observed in non-banded or banded control mice. The proportion of areas of lesions to total left ventricular area increased over time: 1.0 +/- 0.6% in mdx mice without aortic banding (sham, n = 6), and 1.7+/-1.4% 1 day (n = 6, vs. sham, NS), 2.6 +/- 1.9% 2 days (n = 7, vs. sham, P < 0.05), 6.3+ /- 6.5% 7 days (n = 13, vs. sham, P < 0.05) and 9.9 +/- 8.3% 14 days after aortic banding (n=15, vs. sham, P < 0.01). Furthermore, linear regression analysis revealed a significant correlation between percentage of lesion area and systolic pressure in mdx mice (P < 0.05). CONCLUSION: Dystrophin-deficient myocardium is more vulnerable than normal myocardium to pressure overload in vivo. This result has two clinical implications: (1) the patients with dystrophynopathy, such as the Duchenne and the Becker types of muscular dystrophy and X-linked type of dilated cardiomyopathy, who develop arterial hypertension should be treated aggressively, and (2) they should avoid stresses that elevate blood pressure.
Asunto(s)
Distrofina/deficiencia , Hipertensión/complicaciones , Hipertrofia Ventricular Izquierda/etiología , Distrofia Muscular Animal/complicaciones , Miocardio/patología , Animales , Aorta/fisiopatología , Presión Sanguínea/fisiología , Cardiomiopatía Dilatada/complicaciones , Ventrículos Cardíacos/patología , Hemodinámica/fisiología , Hipertensión/patología , Hipertrofia Ventricular Izquierda/patología , Modelos Lineales , Masculino , Ratones , Ratones Endogámicos C57BL , Distrofia Muscular Animal/patología , Distrofia Muscular Animal/fisiopatología , Miocardio/metabolismo , Estrés MecánicoRESUMEN
A strict correlation between the intensity of the cyanide-resistant alternative respiratory pathway and the intracellular peroxide levels in the cephalosporin C producer filamentous fungus Acremonium chrysogenum was demonstrated. Intracellular peroxide levels increased in a dose-dependent manner after addition of H2O2 to the culture media. A similar phenomenon was observed due to the specific inhibition of catalase by salicylic acid. In both cases, cyanide-resistant respiration was markedly stimulated. On the other hand, both cyanide-resistant respiration and intracellular peroxide levels were effectively suppressed by the lipid peroxyl radical scavenger DL-alpha-tocopherol, which breaks lipid peroxidation chains effectively. Our findings firmly supported the assumption that there is a connection between the intracellular peroxide levels and the intensity of the alternative respiratory pathway in fungi.
Asunto(s)
Acremonium/metabolismo , Catalasa/antagonistas & inhibidores , Cefalosporinas/metabolismo , Peróxido de Hidrógeno/farmacología , Peróxidos/metabolismo , Ácido Salicílico/farmacología , Vitamina E/farmacología , Acremonium/efectos de los fármacos , Acremonium/crecimiento & desarrollo , Catalasa/metabolismo , Cianuros/farmacología , Citocromos/fisiología , Relación Dosis-Respuesta a Droga , Fluoresceínas , Depuradores de Radicales Libres , Glucosa/metabolismo , Cinética , Hongos Mitospóricos , Oxígeno , Consumo de Oxígeno/efectos de los fármacos , Peróxidos/análisis , Polarografía , Espectrometría de Fluorescencia , Factores de TiempoRESUMEN
It has been previously reported that sauna therapy, a thermal therapy, improves the hemodynamics and clinical symptoms in patients with chronic heart failure and also improves endothelial function, which is impaired in such patients. The present study investigated whether the improvements observed with sauna therapy are through modulation of arterial endothelial nitric oxide synthase (eNOS) expression. Eight male Syrian golden hamsters underwent sauna therapy, using an experimental far infrared-ray dry sauna system, at 39 degrees C for 15 min followed by 30 degrees C for 20 min daily for 4 weeks. Control group hamsters were placed in the sauna system switched off at room temperature of 24 degrees C for 35 min. Immunohistochemistry found greater amounts of the immunoreactive products of eNOS in the endothelial cells of the aorta and carotid, femoral and coronary arteries in the sauna group than in the control group. Western blot analysis also revealed that 4-week sauna therapy significantly increased eNOS expression in aortas by 50% in 4 series of independent experiments with an identical protocol (p<0.01). In reverse transcription polymerase chain reaction assay, the eNOS mRNA in aortas was greater in the sauna group than in controls, with a peak at 1-week of sauna therapy (approximately 40-fold increase). In conclusion, repeated thermal therapy upregulates eNOS expression in arterial endothelium.
Asunto(s)
Arterias/fisiología , Endotelio Vascular/fisiología , Óxido Nítrico Sintasa/fisiología , Animales , Cricetinae , Hipertermia Inducida , Inmunohistoquímica , Masculino , Óxido Nítrico Sintasa de Tipo III , Reacción en Cadena de la Polimerasa , Regulación hacia ArribaRESUMEN
Factor C is an unusual extracellular protein capable of inducing cytodifferentiation in certain Streptomyces strains. The protein is produced by Streptomyces griseus 45H at such a low amount that the study of its mode of action was hindered by the shortage of purified protein. We report here the expression of C-terminally hexa-His-tagged factor C in Streptomyces lividans and Escherichia coli. Expression in S. lividans is low while in E. coli it is relatively high, yielding about 5--10 mg of biologically fully active protein per liter culture.
Asunto(s)
Proteínas Bacterianas/biosíntesis , Cromatografía de Afinidad , Streptomyces griseus/metabolismo , Secuencia de Aminoácidos , Aminoácidos/análisis , Proteínas Bacterianas/genética , Proteínas Bacterianas/aislamiento & purificación , Secuencia de Bases , Clonación Molecular , ADN Bacteriano , Escherichia coli , Genes Bacterianos , Histidina/metabolismo , Datos de Secuencia Molecular , Proteínas Recombinantes de Fusión/biosíntesis , Proteínas Recombinantes de Fusión/genética , Proteínas Recombinantes de Fusión/aislamiento & purificación , Streptomyces griseus/genética , Streptomyces griseus/ultraestructura , Transformación BacterianaRESUMEN
Intracellular beta-galactosidase from Penicillium chrysogenum NCAIM 00237 was purified by procedures including precipitation with ammonium sulfate, ion-exchange chromatography on DEAE-Sephadex, affinity chromatography, and chromatofocusing. These steps resulted a purification of 66-fold, a yield of about 8%, and a specific activity of 5.84 U mg(-1) protein. Some enzyme characteristics were determined using o-nitrophenyl-beta-d-galactopyranoside as substrate. The pH and temperature optimum of the activity were about 4.0 and 30 degrees C respectively. The K(m) and pI values were 1.81 mM and 4.6. beta-Galactosidase of P. chrysogenum is a multimeric enzyme of about 270 kDa composed of monomers with a molecular mass of 66 kDa.
Asunto(s)
Penicillium chrysogenum/enzimología , beta-Galactosidasa/aislamiento & purificación , beta-Galactosidasa/metabolismo , Cromatografía de Afinidad/métodos , Cromatografía por Intercambio Iónico/métodos , Electroforesis en Gel de Poliacrilamida , Cinética , Peso Molecular , Termodinámica , Ultrafiltración , beta-Galactosidasa/químicaRESUMEN
Growth and beta-galactosidase activity of the penicillin producer industrial Penicillium chrysogenum NCAIM 00237 strain were examined using different carbon sources. Good growth was observed using glucose, sucrose, glycerol and galactose, while growth on lactose was substantially slower. beta-Galactosidase activity was high on lactose and very low on all the other carbon sources tested. In glucose grown cultures after exhaustion of glucose as repressing carbon source a derepressed low level of the enzyme was observed. cAMP concentration in lactose grown cultures was relatively high, in glucose grown cultures was low. Caffeine substantially decreased glucose consumption and growth but did not increase beta-galactosidase activity and did not prevent glucose repression which rules out the involvement of cAMP in the regulation of beta-galactosidase biosynthesis in Penicillium chrysogenum.
Asunto(s)
Penicillium chrysogenum/enzimología , beta-Galactosidasa/biosíntesis , Cafeína/farmacología , AMP Cíclico/análisis , Glucosa/metabolismo , Glucosa/farmacología , Lactosa/metabolismo , Lactosa/farmacologíaRESUMEN
To evaluate the association between haemostatic parameters and increased risk of myocardial infarction (MI) at a young age, we measured fibrinogen, factor VII, antithrombin III, protein C, protein S, tissue factor (TF), free form tissue factor pathway inhibitor (TFPI), plasminogen, alpha2-antiplasmin, tissue plasminogen activator (tPA), plasminogen activator inhibitor-I (PAI-I), and lipoprotein (a) in 140 young men with MI before age 45 and 150 age-matched healthy men. TF, TF/TFPI ratio, PAI-I, PAI-I/tPA ratio, plasminogen, and lipoprotein (a) in young MI patients were all significantly higher than controls, while TFPI, antithrombin II, and tPA were significantly lower (P <0.001 of each). Significant determinants of MI risk were PAI-I/tPA ratio (R2 = 0.300, P <0.001), TF/TFPI ratio (R2 = 0.049, P <0.001), antithrombin III (R2 = 0.034, P <0.001), hyperlipidaemia (R2 = 0.019, P = 0.004), diabetes (R2 = 0.014, P = 0.015), lipoprotein (a) (R2 = 0.012, P = 0.023), alpha2-antiplasmin (R2= 0.014, P = 0.012), and protein C (R2= 0.012, P = 0.018). We conclude that the imbalances of PAI-I/tPA and TF/TFPI are significantly associated with MI at a young age, perhaps mediated via impaired fibrinolytic activity.
Asunto(s)
Factores de Coagulación Sanguínea/metabolismo , Homeostasis/fisiología , Infarto del Miocardio/sangre , Adulto , Factores de Coagulación Sanguínea/fisiología , Estudios de Casos y Controles , Hemostasis , Humanos , Japón , Lipoproteínas/sangre , Lipoproteínas/fisiología , Persona de Mediana Edad , Infarto del Miocardio/etiología , Inhibidor 1 de Activador Plasminogénico/sangre , Inhibidor 1 de Activador Plasminogénico/fisiología , Factores de Riesgo , Tromboplastina/metabolismo , Tromboplastina/fisiología , Activador de Tejido Plasminógeno/sangre , Activador de Tejido Plasminógeno/fisiologíaRESUMEN
Remnant-like particles, which have been recognized to be atherogenic derivatives of chylomicrons and very low density lipoproteins, can be measured using a new assay kit. The purpose of the present study was to investigate the association of remnant-like particles with the coagulation system that has an important role in the pathogenesis of myocardial infarction. We assayed blood levels of total cholesterol, triglyceride, HDL-cholesterol, apolipoproteins, remnant-like particles-cholesterol, remnant-like particles-triglyceride, fibrinogen, factor VII antigen, activated factor VII, and tissue factor in 111 patients with a history of myocardial infarction and 128 control subjects. In simple regression analysis, plasma levels of remnant-like particles-cholesterol and remnant-like particles-triglyceride showed a significant positive correlation with the levels of activated factor VII (r=0.319, p<0. 001, and r=0.286, p=0.002, respectively) and the activated factor VII/factor VII antigen ratio (r=0.241, p=0.011, and r=0.249, p=0.008, respectively) in patients with myocardial infarction. In contrast, there were no significant differences between remnant-like particles and activated factor VII in control subjects. In stepwise multivariate regression analysis, the significant determinants of activated factor VII were remnant-like particles-cholesterol (10.2%), apolipoproteins A-I (5.1%), and E (7.1%); for the activated factor VII/factor VII antigen ratio, remnant-like particles-triglyceride (6. 2%), age at blood sampling (5.1%), and apolipoprotein A-I (4.0%) in patients with myocardial infarction. However, the significant determinants of activated factor VII and the activated factor VII/factor VII antigen ratio were HDL-cholesterol (9.9% and 9.2%, respectively) in control subjects. It is concluded that remnant-like particles may be a risk factor for myocardial infarction by activating the extrinsic coagulation pathway.
Asunto(s)
Factor VIIa/metabolismo , Lipoproteínas/sangre , Infarto del Miocardio/sangre , Triglicéridos/sangre , Adulto , Anciano , Apoproteínas/sangre , Autoantígenos/sangre , Biomarcadores/sangre , Análisis Químico de la Sangre , Factores de Coagulación Sanguínea/inmunología , Factores de Coagulación Sanguínea/metabolismo , Estudios de Casos y Controles , Colesterol/sangre , Quilomicrones/sangre , Activación Enzimática , Factor VIIa/inmunología , Femenino , Humanos , Lípidos/sangre , Masculino , Persona de Mediana Edad , Análisis de RegresiónRESUMEN
Factor C is an extracellular signal protein involved in cellular differentiation in Streptomyces griseus. Nuclease S1 mapping experiments revealed that transcription of the gene takes place from a single promoter in a developmental-stage specific manner. The latter was also confirmed by in vivo promoter probing. The sequence of its promoter suggests that the gene is not transcribed by the major sigma factor. The cloned gene expressed from its own promoter in low- and high-copy-number vectors restored normal sporulation to a bald mutant of Streptomyces griseus. Computer analysis of the amino acid sequence revealed the presence of a transmembrane localization segment with the N-terminus positioned inside the cell. These data fit well into our working model that points at an important role for factor C in the morphogenesis of Streptomyces griseus.
Asunto(s)
Proteínas Bacterianas/genética , Regulación Bacteriana de la Expresión Génica , Regiones Promotoras Genéticas , Streptomyces griseus/genética , Transcripción Genética , Secuencia de Aminoácidos , Proteínas Bacterianas/química , Proteínas Bacterianas/metabolismo , Secuencia de Bases , Clonación Molecular , Escherichia coli , Datos de Secuencia Molecular , Reacción en Cadena de la Polimerasa , Proteínas Recombinantes/química , Proteínas Recombinantes/metabolismo , Mapeo Restrictivo , Factor sigma/metabolismo , Endonucleasas Específicas del ADN y ARN con un Solo Filamento , Streptomyces griseus/crecimiento & desarrollo , Streptomyces griseus/metabolismoRESUMEN
Factor C, an extracellular signal protein of cellular differentiation, was studied and significant homology was found to several zinc finger-type regulatory proteins. The complete amino acid sequence, deduced from the gene, that encodes the protein, did not support the hypothesis that this protein might be a zinc finger-type regulatory protein. However, a theoretical single nucleotide insertion in the gene can result in another similarly sized protein containing about 20 His residues, which would be responsible for the high zinc affinity of factor C. The protein sample was reduced, alkylated and then in-gel digested with trypsin. The peptide fragments were then separated by capillary chromatography and identified by microelectrospray mass spectrometry. Peaks of higher intensity were sequenced by tandem mass spectrometry. The identified peptide fragments and the measured molecular mass of factor C protein also confirmed the original sequence of protein, as there was no shift in the open reading frame.
Asunto(s)
Proteínas Bacterianas/aislamiento & purificación , Streptomyces griseus/química , Secuencia de Aminoácidos , Proteínas Bacterianas/química , Proteínas Bacterianas/genética , Genes Bacterianos , Espectrometría de Masas , Datos de Secuencia Molecular , Fragmentos de Péptidos/química , Fragmentos de Péptidos/genética , Fragmentos de Péptidos/aislamiento & purificación , Análisis de Secuencia de Proteína , Streptomyces griseus/genéticaRESUMEN
The proper domain of naive psychological reasoning is human action and human mental states but such reasoning is frequently applied to non-human phenomena as well. The studies reported in this paper test the validity of the currently widespread belief that this tendency is rooted in the fact that naive psychological reasoning is initially restricted to, and triggered by, the perception of self-initiated movement of agents. We report three habituation experiments which examine the necessary conditions under which infants invoke a psychological principle, namely the principle of rational action, to interpret behaviour as goal directed action. Experiment 1 revealed that the principle of rational action already operates at 9 (but not yet at 6) months of age. Experiment 2 demonstrated that perceptual cues indicating agency, such as self-propulsion, are not necessary prerequisites for interpreting behaviour in terms of the principle of rational action. Experiment 3 confirmed that this effect cannot be attributed to generalisation of agentive properties from one object to another. These results suggest that the domain of naive psychology is initially defined only by the applicability of its core principles and its ontology is not restricted to (featurally identified) object kinds such as persons, animates, or agents. We argue that in its initial state naive psychological reasoning is not a cue-based but a principle-based theory.
Asunto(s)
Desarrollo Infantil/fisiología , Cognición , Habituación Psicofisiológica , Conducta del Lactante/psicología , Factores de Edad , Análisis de Varianza , Estudios de Casos y Controles , Femenino , Humanos , Lactante , Masculino , Modelos Psicológicos , Reconocimiento Visual de ModelosRESUMEN
The purpose of this study was to evaluate the rupture and dissection of the vessel wall immediately after balloon dilatation by intravascular ultrasound (IVUS) imaging and to predict restenosis in patients who underwent subsequent coronary stent implantation. Stent implantation improves the long-term results of coronary angioplasty by reducing lesion elastic recoil and arterial remodeling. However, several studies have suggested that neointimal hyperplasia is the cause of instant restenosis. We recruited 60 patients in whom IVUS studies were performed immediately after successful balloon dilatation and just before stent implantation. We compared IVUS parameters with 6-month follow-up quantitative coronary angiography. This was performed in 51 lesions of 51 patients (85%). Qualitative analysis included assessment of plaque composition, plaque eccentricity, plaque fracture and the presence of dissection. In addition, minimal luminal diameter, percent diameter stenosis, percent area stenosis and plaque burden were quantitatively analyzed. Two morphological patterns after balloon dilatation were classified by IVUS. Type I was defined as absence or partial tear of the plaque without disclosure of the media to lumen (22 lesions). Type II was defined as a split in the plaque or dissection of the vessel wall with disclosure of the media to the lumen (29 lesions). At 6 months follow-up, angiographic restenosis occurred in 17 of the 51 lesions (33%). Restenosis was significantly (p < 0.05) more likely to occur in type II (13/29: 45% incidence) than in type I (4/22: 18% incidence). The assessment of plaque morphology immediately after balloon dilatation and before stent implantation provides important therapeutic and prognostic implications.
Asunto(s)
Cateterismo , Enfermedad Coronaria/diagnóstico por imagen , Enfermedad Coronaria/patología , Stents , Ultrasonografía Intervencional , Anciano , Factores de Confusión Epidemiológicos , Angiografía Coronaria , Enfermedad Coronaria/cirugía , Enfermedad Coronaria/terapia , Femenino , Humanos , Masculino , Persona de Mediana Edad , Recurrencia , Factores de RiesgoRESUMEN
The pseudotrisaccharide allosamidin, a potent inhibitor of chitinases, retarded the fragmentation of hyphae but did not affect the fungal growth and cephalosporin-C production in Acremonium chrysogenum. In vitro inhibition of A. chrysogenum cell-bound chitinase(s) by allosamidin revealed that about 47% of the soluble intracellular chitinase activity was resistant to the inhibitory effect of allosamidin. On the other hand, about 76% of the total chitinase activity localised in both the soluble and insoluble enzyme fractions was effectively inhibited by allosamidin. All the chitinase activities were measured using a new procedure based on purified A. chrysogenum chitin as substrate.
Asunto(s)
Acetilglucosamina/análogos & derivados , Acremonium/efectos de los fármacos , Cefalosporinas/biosíntesis , Trisacáridos/farmacología , Acetilglucosamina/farmacología , Acremonium/crecimiento & desarrollo , Acremonium/metabolismo , Quitinasas/antagonistas & inhibidores , Quitinasas/metabolismo , Inhibidores Enzimáticos/farmacologíaRESUMEN
We examined midkine (MK) expression in the rat heart upon experimental myocardial infarction. Immunohistochemical staining revealed, 6 hours after ligation of the left anterior descending coronary artery, strong MK immunoreactivity in myocytes and endothelial cells of a non-infarcted cardiac region. The myocytes of the infarcted cardiac region destined for death showed only a little immunoreactivity. Northern blot analysis suggested that the increased immunoreactivity was due to increased MK synthesis. The induced MK expression is likely to mimic the expression during embryogenesis: MK was strong lye-expressed in the myocytes of embryonic heart, and the expression decreased during embryogenesis.