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2.
RSC Adv ; 14(5): 3473-3479, 2024 Jan 17.
Artigo em Inglês | MEDLINE | ID: mdl-38260000

RESUMO

In this work, we used a one-step hydrothermal method to synthesize blue-emission sulfur-doped carbon dots (S-CDs) using jaggery as a carbon precursor. The synthesized carbon quantum dots showed low toxicity, good water solubility, anti-interference properties, and stable fluorescence. When excited at 310 nm, the S-CDs produced bright emission with a quantum yield of 7.15% at 397 nm. The S-CDs exhibited selective and sensitive quenching responses with limits of detection (LODs) of 4.25 µg mL-1 and 3.15 µg mL-1 for variable concentrations of Cr6+ and Fe3+, respectively, accompanied by a consistent linear relationship between fluorescence intensity and these concentrations. Fluorescence lifetime measurements were used to investigate the fluorescence quenching mechanism, which supports the static type of quenching. Outstanding benefits of the developed S-CD based fluorescence probe include its low cost, excellent sensitivity and selectivity, and ease of use for the detection of Cr6+ and Fe3+ ions. The developed carbon dot based fluorescent probe was successfully used to detect Cr6+ and Fe3+ ions in real water samples with an excellent recovery ratio.

3.
Indian J Otolaryngol Head Neck Surg ; 74(Suppl 2): 949-955, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36452795

RESUMO

To perform a subjective and objective assessment of vocal complaints in patients of allergic rhinitis (AR) using voice handicap index and video-stroboscopy respectively and find the association of their parameters with severity of the disease. Cross-sectional-observational study design. Outpatient department of Otorhinolaryngology of a tertiary centre. Seventy-five adult patients diagnosed with AR and classified according to 'Allergic Rhinitis and its Impact on Asthma' guidelines were compared with same number of normal subjects as controls, with the same age and sex, to ensure uniformity. Both the groups were asked to fill a self-answered questionnaire called Voice Handicap Index (VHI) and underwent laryngeal examination with Video-Stroboscopy (VS). The mean VHI score of the AR group (29.45 ± 32.11) was significantly higher (p < 0.05) than that of controls (12.07 ± 16.62). VS parameters including amplitude, supraglottic activity, vocal edge and phase closure also showed significant difference between cases and controls (p < 0.05). VHI scores increased, but the VS findings did not change significantly with the severity of the disease. AR patients show subjective and objective derangements of voice quality. VHI scores show increase, while VS parameters do not change with the severity of AR.

4.
Crit Care Explor ; 4(7): e0720, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35782295

RESUMO

Compare ICU outcomes and respiratory system mechanics in patients with and without acute kidney injury during invasive mechanical ventilation. DESIGNS: Retrospective cohort study. SETTINGS: ICUs of the University of California, San Diego, from January 1, 2014, to November 30, 2016. PATIENTS: Five groups of patients were compared based on the need for invasive mechanical ventilation, presence or absence of acute kidney injury per the Kidney Disease: Improving Global Outcomes criteria, and the temporal relationship between the development of acute kidney injury and initiation of invasive mechanical ventilation. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: A total of 9,704 patients were included and 4,484 (46%) required invasive mechanical ventilation; 2,009 patients (45%) had acute kidney injury while being treated with invasive mechanical ventilation, and the mortality rate for these patients was 22.4% compared with 5% in those treated with invasive mechanical ventilation without acute kidney injury (p < 0.01). Adjusted hazard of mortality accounting for baseline disease severity was 1.58 (95% CI, 1.22-2.03; p < 0.001]. Patients with acute kidney injury during invasive mechanical ventilation had a significant increase in total ventilator days and length of ICU stay with the same comparison (both p < 0.01). Acute kidney injury during mechanical ventilation was also associated with significantly higher plateau pressures, lower respiratory system compliance, and higher driving pressures (all p < 0.01). These differences remained significant in patients with net negative cumulative fluid balance. CONCLUSIONS: Acute kidney injury during invasive mechanical ventilation is associated with increased ICU mortality, increased ventilator days, increased length of ICU stay, and impaired respiratory system mechanics. These results emphasize the need for investigations of ventilatory strategies in the setting of acute kidney injury, as well as mechanistic studies of crosstalk between the lung and kidney in the critically ill.

5.
Appl Neuropsychol Child ; 11(4): 891-903, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-34085876

RESUMO

This meta-analysis assessed the efficacy of the Cogmed Working Memory Training program in improving near-transfer measures (verbal and visuospatial working memory) and far-transfer measures (attention, executive function, and academic achievement) in school-age children with and without neurological insults or disorders. Relevant studies were searched in databases and clinical trial registries using the keyword Cogmed. Ten published studies and unpublished data from one study met the inclusion criteria. Hedges g was calculated for each outcome measure obtained at pre-intervention, post-intervention, and 3-6 month time points. Analysis compared outcome measures in the control versus experimental groups and examined the role of moderators on treatment effects (control group intervention, intervention environment). Data revealed significant medium-size effects of the Cogmed program in improving verbal and visuospatial working memory post-intervention and for verbal working memory only at the 3-6 month time point. However, the training did not generalize to the far-transfer measures. Analyses indicated that only the type of intervention provided for the control group moderated treatment effects on verbal and visual working memory. Meta-analytic findings suggest that the Cogmed program leads to short-term improvements and in some cases, long-term improvements in working memory in school-age children; however, these effects may not generalize to far-transfer measures.


Assuntos
Aprendizagem , Memória de Curto Prazo , Atenção , Criança , Função Executiva , Humanos , Instituições Acadêmicas
6.
Drugs R D ; 21(4): 455-465, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34741731

RESUMO

BACKGROUND AND OBJECTIVE: VIR-2218 is an investigational N-acetylgalactosamine-conjugated RNA interference therapeutic in development for chronic hepatitis B virus (HBV) infection. VIR-2218 was designed to silence HBV transcripts across all genotypes and uses Enhanced Stabilization Chemistry Plus (ESC+) technology. This study was designed to evaluate the single-dose pharmacokinetics of VIR-2218 in preclinical species and healthy volunteers. METHODS: Preclinically, a single subcutaneous dose of VIR-2218 (10 mg/kg) was administered to rats and nonhuman primates (NHPs), and the pharmacokinetics were assessed in plasma, urine, and liver using standard noncompartmental analysis (NCA) methods. Clinically, healthy volunteers were randomized (6:2 active:placebo) to receive a single subcutaneous dose of VIR-2218 (50-900 mg) or placebo. Pharmacokinetics were similarly assessed within human plasma and urine using NCA methods. RESULTS: In rats and NHPs, VIR-2218 was stable in plasma and was converted to AS(N-1)3'VIR-2218, the most prominent circulating metabolite, at < 10% plasma exposure compared with parent. VIR-2218 rapidly distributed to the liver, reaching peak liver concentrations within 7 and 24 h in rats and NHPs, respectively. In humans, VIR-2218 was rapidly absorbed, with a median time to peak plasma concentration (tmax) of 4-7 h, and had a short median plasma half-life of 2-5 h. Plasma exposures for area under the plasma concentration-time curve up to 12 h (AUC0-12) and mean maximum concentrations (Cmax) increased in a slightly greater-than-dose-proportional manner across the dose range studied. Interindividual pharmacokinetic variability was low to moderate, with a percent coefficient of variation of < 32% for AUC and < 43% for Cmax. A portion of VIR-2218 was converted to an active metabolite, AS(N-1)3'VIR-2218, with a median tmax of 6-10 h, both of which declined below the lower limit of quantification in plasma within 48 h. The pharmacokinetic profile of AS(N-1)3'VIR-2218 was similar to that of VIR-2218, with plasma AUC0-12 and Cmax values ≤ 12% of VIR-2218. VIR-2218 and AS(N-1)3'VIR-2218 were detectable in urine through the last measured time point, with approximately 17-48% of the administered dose recovered in urine as unchanged VIR-2218 over 0-24 h postdose. Based on pharmacokinetics in preclinical species, VIR-2218 localizes to the liver and likely exhibits prolonged hepatic exposure. Overall, no severe or serious adverse events or discontinuations due to adverse events were observed within the dose range evaluated for VIR-2218 in healthy volunteers (Vir Biotechnology, Inc., unpublished data). CONCLUSIONS: VIR-2218 showed favorable pharmacokinetics in healthy volunteers supportive of subcutaneous dosing and continued development in patients with chronic HBV infection. CLINICAL TRIAL REGISTRATION NO: NCT03672188, September 14, 2018.


Assuntos
Vírus da Hepatite B , Hepatite B Crônica , Animais , Área Sob a Curva , Humanos , Interferência de RNA , Terapêutica com RNAi , Ratos
7.
J Allied Health ; 50(1): 3-8, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33646244

RESUMO

Rehabilitation, seen as a disability-specific service needed only by few of the world's population, has not been prioritized in countries and is under-resourced. A rehabilitation-ready health workforce is potentially the most important resource for improving functioning and the quality of life for the 2.41 billion people worldwide needing this care. In April 2019, CGFNS International, Inc., and the Association of Schools Advancing Health Professions (ASAHP) partnered to respond to the World Health Organization's Rehab 2030, which emphasizes the need for global action by professional organizations, development agencies, and civil society to develop and maintain a sustainable workforce for rehabilitation under different healthcare models in different economies. The global certification framework presented in this article provides a mechanism to validate rehabilitation knowledge and practice competence of individual health workers. The impact of certification on upgrading rehabilitation education and upskilling the world's rehabilitation health workforce cannot be overstated.


Assuntos
Pessoas com Deficiência , Qualidade de Vida , Certificação , Pessoal de Saúde , Mão de Obra em Saúde , Humanos
8.
Cochlear Implants Int ; 22(1): 17-28, 2021 01.
Artigo em Inglês | MEDLINE | ID: mdl-32744185

RESUMO

OBJECTIVE: This study examined the consequences of long-term auditory deprivation on visuospatial functions, visuomotor functions, and visual attention skills in adults with early-onset hearing loss. METHODS: Fifteen adults with bilateral, early-onset (before age 3), severe-to-profound hearing loss who used spoken language participated in this study. Visuospatial (figure ground, form constancy, visual perception) and visuomotor functions (visuomotor integration, visual search) were examined using norm-referenced tests. Visual attention scales were examined using a computerized program, IVA plus continuous performance test. RESULTS: As a group, participants performed in the average range on visuospatial and visuomotor functions when compared to normative data presented in the test instruments. However, participants demonstrated below average performance on sustained visual attention. Duration of cochlear implant use positively correlated with one of the visual attention scales, namely visual speed. CONCLUSIONS: The findings of the current study suggest that adults with early-onset hearing loss may demonstrate difficulties in sustaining attention to visual information. Data also suggest that increased experience with cochlear implant may ameliorate deficits associated with visual attention. Future studies should explore challenges experienced by adults with early-onset hearing loss in their daily activities that may result from this deficit and intervention programs that may enhance visual attention skills.


Assuntos
Implante Coclear , Implantes Cocleares , Surdez , Perda Auditiva , Percepção da Fala , Adulto , Pré-Escolar , Surdez/cirurgia , Perda Auditiva/cirurgia , Humanos , Percepção Visual
9.
Cell ; 183(4): 1024-1042.e21, 2020 11 12.
Artigo em Inglês | MEDLINE | ID: mdl-32991844

RESUMO

Analysis of the specificity and kinetics of neutralizing antibodies (nAbs) elicited by SARS-CoV-2 infection is crucial for understanding immune protection and identifying targets for vaccine design. In a cohort of 647 SARS-CoV-2-infected subjects, we found that both the magnitude of Ab responses to SARS-CoV-2 spike (S) and nucleoprotein and nAb titers correlate with clinical scores. The receptor-binding domain (RBD) is immunodominant and the target of 90% of the neutralizing activity present in SARS-CoV-2 immune sera. Whereas overall RBD-specific serum IgG titers waned with a half-life of 49 days, nAb titers and avidity increased over time for some individuals, consistent with affinity maturation. We structurally defined an RBD antigenic map and serologically quantified serum Abs specific for distinct RBD epitopes leading to the identification of two major receptor-binding motif antigenic sites. Our results explain the immunodominance of the receptor-binding motif and will guide the design of COVID-19 vaccines and therapeutics.


Assuntos
Anticorpos Neutralizantes/imunologia , Mapeamento de Epitopos/métodos , Glicoproteína da Espícula de Coronavírus/imunologia , Enzima de Conversão de Angiotensina 2 , Anticorpos Monoclonais/química , Anticorpos Monoclonais/genética , Anticorpos Monoclonais/imunologia , Anticorpos Neutralizantes/sangue , Anticorpos Neutralizantes/química , Anticorpos Antivirais/sangue , Anticorpos Antivirais/química , Anticorpos Antivirais/imunologia , Reações Antígeno-Anticorpo , Betacoronavirus/imunologia , Betacoronavirus/isolamento & purificação , Betacoronavirus/metabolismo , Sítios de Ligação , COVID-19 , Infecções por Coronavirus/patologia , Infecções por Coronavirus/virologia , Epitopos/química , Epitopos/imunologia , Humanos , Imunoglobulina A/sangue , Imunoglobulina A/imunologia , Imunoglobulina G/sangue , Imunoglobulina G/imunologia , Imunoglobulina M/sangue , Imunoglobulina M/imunologia , Cinética , Simulação de Dinâmica Molecular , Pandemias , Peptidil Dipeptidase A/química , Peptidil Dipeptidase A/metabolismo , Pneumonia Viral/patologia , Pneumonia Viral/virologia , Ligação Proteica , Domínios Proteicos/imunologia , Estrutura Quaternária de Proteína , SARS-CoV-2 , Glicoproteína da Espícula de Coronavírus/química , Glicoproteína da Espícula de Coronavírus/genética , Glicoproteína da Espícula de Coronavírus/metabolismo
10.
Indian J Psychiatry ; 61(Suppl 4): S827-S831, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31040482

RESUMO

Mental Healthcare Act (MHCA) 2017 was gazetted on April 7, 2017. It repeals the Mental Health Act, 1987, and it can be implemented only after the state rules are formed. The central government has already published three sets of rules. This article was written with an objective to review how to make rules and regulations for the state as per MHCA, 2017. All sections of MHCA 2017 and the mental health rules previously made by different states according to the Mental Health Act 1987 were reviewed. Google and PubMed searches were done to review the implementation of their respective mental health acts by different countries and states in the past. Go through Central/State Mental Health Rules, 2018, framed by the central government. Try to adapt it for the state. A meeting on MHCA 2017 should be conducted, including all stakeholders who will give their suggestions about changes to be made. Frame an initial draft and discuss it with the stakeholders and finalize the draft. Discuss the draft in state mental health authority meetings and submit the draft to the government. The Department of Legislation and Parliamentary Affairs can be consulted. The draft should be sent to the central government's Ministry of Health and Family Welfare for approval. According to MHCA 2017, state rules can be formed in relation to the aspects mentioned under Sections 121 and 123. The state government should make notification of the rules and then implement them.

11.
PLoS Med ; 16(4): e1002773, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-30939136

RESUMO

BACKGROUND: The sites of mycobacterial infection in the lungs of tuberculosis (TB) patients have complex structures and poor vascularization, which obstructs drug distribution to these hard-to-reach and hard-to-treat disease sites, further leading to suboptimal drug concentrations, resulting in compromised TB treatment response and resistance development. Quantifying lesion-specific drug uptake and pharmacokinetics (PKs) in TB patients is necessary to optimize treatment regimens at all infection sites, to identify patients at risk, to improve existing regimens, and to advance development of novel regimens. Using drug-level data in plasma and from 9 distinct pulmonary lesion types (vascular, avascular, and mixed) obtained from 15 hard-to-treat TB patients who failed TB treatments and therefore underwent lung resection surgery, we quantified the distribution and the penetration of 7 major TB drugs at these sites, and we provide novel tools for treatment optimization. METHODS AND FINDINGS: A total of 329 plasma- and 1,362 tissue-specific drug concentrations from 9 distinct lung lesion types were obtained according to optimal PK sampling schema from 15 patients (10 men, 5 women, aged 23 to 58) undergoing lung resection surgery (clinical study NCT00816426 performed in South Korea between 9 June 2010 and 24 June 2014). Seven major TB drugs (rifampin [RIF], isoniazid [INH], linezolid [LZD], moxifloxacin [MFX], clofazimine [CFZ], pyrazinamide [PZA], and kanamycin [KAN]) were quantified. We developed and evaluated a site-of-action mechanistic PK model using nonlinear mixed effects methodology. We quantified population- and patient-specific lesion/plasma ratios (RPLs), dynamics, and variability of drug uptake into each lesion for each drug. CFZ and MFX had higher drug exposures in lesions compared to plasma (median RPL 2.37, range across lesions 1.26-22.03); RIF, PZA, and LZD showed moderate yet suboptimal lesion penetration (median RPL 0.61, range 0.21-2.4), while INH and KAN showed poor tissue penetration (median RPL 0.4, range 0.03-0.73). Stochastic PK/pharmacodynamic (PD) simulations were carried out to evaluate current regimen combinations and dosing guidelines in distinct patient strata. Patients receiving standard doses of RIF and INH, who are of the lower range of exposure distribution, spent substantial periods (>12 h/d) below effective concentrations in hard-to-treat lesions, such as caseous lesions and cavities. Standard doses of INH (300 mg) and KAN (1,000 mg) did not reach therapeutic thresholds in most lesions for a majority of the population. Drugs and doses that did reach target exposure in most subjects include 400 mg MFX and 100 mg CFZ. Patients with cavitary lesions, irrespective of drug choice, have an increased likelihood of subtherapeutic concentrations, leading to a higher risk of resistance acquisition while on treatment. A limitation of this study was the small sample size of 15 patients, performed in a unique study population of TB patients who failed treatment and underwent lung resection surgery. These results still need further exploration and validation in larger and more diverse cohorts. CONCLUSIONS: Our results suggest that the ability to reach and maintain therapeutic concentrations is both lesion and drug specific, indicating that stratifying patients based on disease extent, lesion types, and individual drug-susceptibility profiles may eventually be useful for guiding the selection of patient-tailored drug regimens and may lead to improved TB treatment outcomes. We provide a web-based tool to further explore this model and results at http://saviclab.org/tb-lesion/.


Assuntos
Antituberculosos/administração & dosagem , Antituberculosos/farmacocinética , Pulmão/metabolismo , Tuberculose Resistente a Múltiplos Medicamentos/etiologia , Tuberculose Pulmonar/tratamento farmacológico , Adulto , Técnicas de Apoio para a Decisão , Progressão da Doença , Esquema de Medicação , Cálculos da Dosagem de Medicamento , Farmacorresistência Bacteriana Múltipla , Quimioterapia Combinada , Feminino , Humanos , Isoniazida/administração & dosagem , Isoniazida/farmacocinética , Canamicina/administração & dosagem , Canamicina/farmacocinética , Linezolida/administração & dosagem , Linezolida/farmacocinética , Pulmão/efeitos dos fármacos , Pulmão/patologia , Masculino , Pessoa de Meia-Idade , Pirazinamida/administração & dosagem , Pirazinamida/farmacocinética , Estudos Retrospectivos , Rifampina/administração & dosagem , Rifampina/farmacocinética , Distribuição Tecidual , Falha de Tratamento , Tuberculose Resistente a Múltiplos Medicamentos/metabolismo , Tuberculose Resistente a Múltiplos Medicamentos/patologia , Tuberculose Pulmonar/metabolismo , Tuberculose Pulmonar/patologia , Adulto Jovem
13.
Environ Sci Pollut Res Int ; 25(17): 16355-16375, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-28488147

RESUMO

In recent years, microbial degradation and bioremediation approaches of polychlorinated biphenyls (PCBs) have been studied extensively considering their toxicity, carcinogenicity and persistency potential in the environment. In this direction, different catabolic enzymes have been identified and reported for biodegradation of different PCB congeners along with optimization of biological processes. A genome analysis of PCB-degrading bacteria has led in an improved understanding of their metabolic potential and adaptation to stressful conditions. However, many stones in this area are left unturned. For example, the role and diversity of uncultivable microbes in PCB degradation are still not fully understood. Improved knowledge and understanding on this front will open up new avenues for improved bioremediation technologies which will bring economic, environmental and societal benefits. This article highlights on recent advances in bioremediation of PCBs in soil. It is demonstrated that bioremediation is the most effective and innovative technology which includes biostimulation, bioaugmentation, phytoremediation and rhizoremediation and acts as a model solution for pollution abatement. More recently, transgenic plants and genetically modified microorganisms have proved to be revolutionary in the bioremediation of PCBs. Additionally, other important aspects such as pretreatment using chemical/physical agents for enhanced biodegradation are also addressed. Efforts have been made to identify challenges, research gaps and necessary approaches which in future, can be harnessed for successful use of bioremediation under field conditions. Emphases have been given on the quality/efficiency of bioremediation technology and its related cost which determines its ultimate acceptability.


Assuntos
Bactérias/metabolismo , Plantas Geneticamente Modificadas/metabolismo , Bifenilos Policlorados/toxicidade , Poluentes do Solo/análise , Bactérias/química , Biodegradação Ambiental , Plantas Geneticamente Modificadas/química , Bifenilos Policlorados/química , Solo , Microbiologia do Solo
14.
Int J Phytoremediation ; 19(10): 899-908, 2017 Oct 03.
Artigo em Inglês | MEDLINE | ID: mdl-28318301

RESUMO

A comparative study was carried out to evaluate the efficiency of different substrate materials along with macrophytes Typha latifolia and Cyperus rotundus in treating domestic wastewater intended for reuse in agriculture. The study was conducted over a period of 6 months with different retention times, and observations were taken twice per month. One-way analysis of variance and Tukey's Honest Significant Difference (HSD) tests were used to determine statistical significant differences between experimental columns. Treatment with T. latifolia planted in sand and mix substrate with 4-day retention time remarkably reduced the concentration of all bacterial pathogens. Log reductions observed were approximately 5.01 and 4.82 for total coliform (TC), 4.46 and 3.93 for Escherichia coli, and 5.52 and 5.48 for Shigella, respectively. Moreover, these treatments were also efficient in completely removing fecal coliform (FC) and Salmonella.Maximum parasites were removed by the treatment having sand alone as a substrate containing C. rotundus, but the difference was not significant from those planted with T. latifolia in the same substrate. The results suggest that T. latifolia aids in bacterial pathogens removal, while C. rotundus aids in parasites removal. Thus, wastewater treatment through constructed wetland having mix plantation of these species along with sand can eliminate some of the major enteric pathogens.


Assuntos
Cyperus , Typhaceae , Águas Residuárias , Purificação da Água , Biodegradação Ambiental , Eliminação de Resíduos Líquidos
15.
Eur J Med Chem ; 124: 262-269, 2016 Nov 29.
Artigo em Inglês | MEDLINE | ID: mdl-27592395

RESUMO

Keeping in mind the immense biological potential of chalcones and sulfonamide scaffolds, a library of sulfonamide chalcones has been synthesized and evaluated for in vitro antifilarial assay against human lymphatic filarial parasite Brugia malayi. Experimental evidence showcased for the first time the potential of some sulfonamide chalcones as effective and safe antifilarial lead molecules against human lymphatic filarial parasite B. malayi. Sulfonamide chalcones 4d, 4p, 4q, 4t and 4aa displayed the significantly wide therapeutic window. Particularly chalcones with halogen substitution in aromatic ring proved to be potent antifilarial agents against Brugia malayi. Sulphonamide chalcones with lipophilic methyl moiety (4q and 4aa) at para position of terminal phenyl rings of compounds were found to have remarkable antifilarial activities with therapeutic efficacy. Observed preliminary evidence of apoptosis by effective chalcone derivatives envisaged its fair possibility to inhibit folate pathway with consequent defect in DNA synthesis.


Assuntos
Brugia Malayi/efeitos dos fármacos , Chalconas/síntese química , Chalconas/farmacologia , Desenho de Fármacos , Filaricidas/síntese química , Filaricidas/farmacologia , Animais , Brugia Malayi/crescimento & desenvolvimento , Chalconas/química , Chalconas/toxicidade , Técnicas de Química Sintética , Filaricidas/química , Filaricidas/toxicidade , Humanos , Interações Hidrofóbicas e Hidrofílicas , Concentração Inibidora 50 , Estágios do Ciclo de Vida , Modelos Moleculares , Conformação Molecular
16.
Int J Pediatr Otorhinolaryngol ; 85: 158-65, 2016 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-27240516

RESUMO

OBJECTIVE: The objective of the study was to compare visual sequential processing in school-age children with cochlear implants (CIs) and their normal-hearing (NH) peers. Visual sequential processing was examined using both behavioral and an event-related potential (ERP) measures. METHODS: Eighteen children with CIs and nineteen children who had hearing within normal limits (NH) participated in the behavioral study. Subtests from the Test of Visual Perceptual Skills and the Sensory Integration and Praxis Test were administered to all children. ERP measures were collected from five children with CI and five age-matched peers. Peak latencies (N200 and P300) and reaction times for visual sequential processing were compared in these two groups. RESULTS: The findings of the study revealed significant group differences in visual sequential memory and visuo-motor sequencing tasks suggesting that children with severe-profound hearing loss may have difficulties in visual sequential tasks. The study also revealed longer P300 latencies and longer reaction times for a visual sequential matching task in children with CI when compared to their NH peers suggesting slower or delayed processing of visual sequential stimuli. CONCLUSIONS: This exploratory study involving behavioral and ERP measures showed that as a group, children with prelingual, severe-profound hearing loss who use CIs have difficulties with visual sequential processing. These findings may have implications for rehabilitation for children with hearing loss in the light of recent evidence that accurate and efficient processing of sequentially presented visual stimuli is important for language and reading outcomes.


Assuntos
Implantes Cocleares , Surdez/fisiopatologia , Potenciais Evocados , Percepção Visual , Estudos de Casos e Controles , Criança , Pré-Escolar , Surdez/reabilitação , Movimentos Oculares , Feminino , Audição , Humanos , Masculino , Tempo de Reação , Análise e Desempenho de Tarefas
17.
Int J Cancer ; 139(4): 729-35, 2016 08 15.
Artigo em Inglês | MEDLINE | ID: mdl-26934471

RESUMO

The conventional view of tumour vascularization is that tumours acquire their blood supply from neighbouring normal stroma. Additional methods of tumour vascularization such as intussusceptive angiogenesis, vasculogenic mimicry, vessel co-option and vasculogenesis have been demonstrated to occur. However, the origin of the endothelial cells and pericytes in the tumour vasculature is not fully understood. Their origin from malignant cells has been shown indirectly in lymphoma and neuroblastoma by immuno-FISH experiments. It is now evident that tumours arise from a small population of cells called cancer stem cells (CSCs) or tumour initiating cells. Recent data suggest that a proportion of tumour endothelial cells arise from cancer stem cells in glioblastoma. This was demonstrated both in vitro and in vivo. The analysis of chromosomal abnormalities in endothelial cells showed identical genetic changes to those identified in tumour cells. However, another report contradicted these results from the earlier studies in glioblastoma and had shown that CSCs give rise to pericytes and not endothelial cells. The main thrust of this review is the critical analysis of the conflicting data from different studies and the remaining questions in this field of research. The mechanism by which this phenomenon occurs is also discussed in detail. The transdifferentiation of CSCs to endothelial cells/pericytes has many implications in the progression and metastasis of the tumours and hence it would be a novel target for antiangiogenic therapy.


Assuntos
Transformação Celular Neoplásica , Neoplasias/etiologia , Neoplasias/patologia , Neovascularização Patológica , Animais , Biomarcadores , Comunicação Celular , Transdiferenciação Celular , Células Endoteliais/citologia , Células Endoteliais/metabolismo , Células Endoteliais/patologia , Humanos , Neoplasias/metabolismo , Células-Tronco Neoplásicas/metabolismo , Células-Tronco Neoplásicas/patologia , Pericitos/citologia , Pericitos/metabolismo , Pericitos/patologia , Transdução de Sinais
18.
Diabetes Metab Syndr ; 10(2): 88-91, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26777258

RESUMO

AIM: The study was aimed to investigate the effect of voglibose or acarbose as an add-on treatment in overweight/obese type 2 diabetes (T2DM) patients who are uncontrolled with metformin and sulfonylureas (SUs) in Western part of India. PARTICIPANTS AND METHODS: A retrospective study included 77 participants (BMI≥25kg/m(2); HbA1c level>8% and<9.5%) with overweight/obese T2DM. These participants were treated with either voglibose or acarbose. Glycemic parameters (fasting blood glucose and glycated hemoglobin [HbA1c]), bodyweight, BMI and lipid parameters were evaluated at baseline, 3-month, 6-month and 9-month of treatment. Adverse events were also captured at respective time points. RESULTS: Voglibose showed significant reduction in HbA1c and bodyweight with short duration of treatment (6 months; P<0.05 and 9 months; P<0.01) whereas acarbose showed significant reduction with longer duration of treatment (9 months; P<0.05) when compared with baseline. Moreover, both treatment groups were reported with reduction in BMI. Further, significant improvement in lipid parameters except LDL and HDL were observed in both treatment groups when compared with baseline. None of participant was discontinued due to side effects of the treatment. In addition, the frequency of hypoglycemia was decreased in both treatment groups. CONCLUSION: Voglibose or acarbose as an add-on treatment with metformin and sulfonylureas in uncontrolled obese/overweight T2DM provides desired glycemic control, reduces bodyweight and improves lipid parameters with good tolerability profile.


Assuntos
Acarbose/uso terapêutico , Diabetes Mellitus Tipo 2/tratamento farmacológico , Inibidores de Glicosídeo Hidrolases/uso terapêutico , Hipoglicemiantes/uso terapêutico , Inositol/análogos & derivados , Obesidade/complicações , Compostos de Sulfonilureia/uso terapêutico , Acarbose/administração & dosagem , Acarbose/efeitos adversos , Adulto , Glicemia , Índice de Massa Corporal , Feminino , Hemoglobinas Glicadas/metabolismo , Inibidores de Glicosídeo Hidrolases/administração & dosagem , Inibidores de Glicosídeo Hidrolases/efeitos adversos , Humanos , Hipoglicemiantes/administração & dosagem , Hipoglicemiantes/efeitos adversos , Índia , Inositol/administração & dosagem , Inositol/efeitos adversos , Inositol/uso terapêutico , Lipídeos/sangue , Masculino , Metformina/uso terapêutico , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Tempo , Resultado do Tratamento
19.
ACS Nano ; 9(12): 11667-77, 2015 Dec 22.
Artigo em Inglês | MEDLINE | ID: mdl-26554425

RESUMO

Nanowire (NW) arrays offer opportunities for parallel, nondestructive intracellular access for biomolecule delivery, intracellular recording, and sensing. Spontaneous cell membrane penetration by vertical nanowires is essential for these applications, yet the time- and geometry-dependent penetration process is still poorly understood. In this work, the dynamic NW-cell interface during cell spreading was examined through experimental cell penetration measurements combined with two mechanical models based on substrate adhesion force or cell traction forces. Penetration was determined by comparing the induced tension at a series of given membrane configurations to the critical membrane failure tension. The adhesion model predicts that penetration occurs within a finite window shortly after initial cell contact and adhesion, while the traction model predicts increasing penetration over a longer period. NW penetration rates determined from a cobalt ion delivery assay are compared to the predicted results from the two models. In addition, the effects of NW geometry and cell properties are systematically evaluated to identify the key factors for penetration.


Assuntos
Membrana Celular/fisiologia , Membrana Celular/ultraestrutura , Nanofios/química , Animais , Células CHO , Adesão Celular/fisiologia , Cricetulus , Microscopia Eletrônica de Varredura
20.
Int J Pediatr Otorhinolaryngol ; 79(10): 1647-53, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26282504

RESUMO

OBJECTIVE: The objective of the study was to examine short-term memory and working memory through both visual and auditory tasks in school-age children with cochlear implants. The relationship between the performance on these cognitive skills and reading as well as language outcomes were examined in these children. METHODS: Ten children between the ages of 7 and 11 years with early-onset bilateral severe-profound hearing loss participated in the study. Auditory and visual short-term memory, auditory and visual working memory subtests and verbal knowledge measures were assessed using the Woodcock Johnson III Tests of Cognitive Abilities, the Wechsler Intelligence Scale for Children-IV Integrated and the Kaufman Assessment Battery for Children II. Reading outcomes were assessed using the Woodcock Reading Mastery Test III. RESULTS: Performance on visual short-term memory and visual working memory measures in children with cochlear implants was within the average range when compared to the normative mean. However, auditory short-term memory and auditory working memory measures were below average when compared to the normative mean. Performance was also below average on all verbal knowledge measures. Regarding reading outcomes, children with cochlear implants scored below average for listening and passage comprehension tasks and these measures were positively correlated to visual short-term memory, visual working memory and auditory short-term memory. Performance on auditory working memory subtests was not related to reading or language outcomes. CONCLUSIONS: The children with cochlear implants in this study demonstrated better performance in visual (spatial) working memory and short-term memory skills than in auditory working memory and auditory short-term memory skills. Significant positive relationships were found between visual working memory and reading outcomes. The results of the study provide support for the idea that WM capacity is modality specific in children with hearing loss. Based on these findings, reading instruction that capitalizes on the strengths in visual short-term memory and working memory is suggested for young children with early-onset hearing loss.


Assuntos
Implante Coclear/métodos , Implantes Cocleares , Perda Auditiva/cirurgia , Memória de Curto Prazo/fisiologia , Leitura , Percepção Auditiva/fisiologia , Criança , Feminino , Humanos , Testes de Inteligência , Idioma , Testes de Linguagem , Masculino
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