Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 16 de 16
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Sensors (Basel) ; 21(17)2021 Aug 24.
Artigo em Inglês | MEDLINE | ID: mdl-34502592

RESUMO

Human action recognition in videos has become a popular research area in artificial intelligence (AI) technology. In the past few years, this research has accelerated in areas such as sports, daily activities, kitchen activities, etc., due to developments in the benchmarks proposed for human action recognition datasets in these areas. However, there is little research in the benchmarking datasets for human activity recognition in educational environments. Therefore, we developed a dataset of teacher and student activities to expand the research in the education domain. This paper proposes a new dataset, called EduNet, for a novel approach towards developing human action recognition datasets in classroom environments. EduNet has 20 action classes, containing around 7851 manually annotated clips extracted from YouTube videos, and recorded in an actual classroom environment. Each action category has a minimum of 200 clips, and the total duration is approximately 12 h. To the best of our knowledge, EduNet is the first dataset specially prepared for classroom monitoring for both teacher and student activities. It is also a challenging dataset of actions as it has many clips (and due to the unconstrained nature of the clips). We compared the performance of the EduNet dataset with benchmark video datasets UCF101 and HMDB51 on a standard I3D-ResNet-50 model, which resulted in 72.3% accuracy. The development of a new benchmark dataset for the education domain will benefit future research concerning classroom monitoring systems. The EduNet dataset is a collection of classroom activities from 1 to 12 standard schools.


Assuntos
Algoritmos , Inteligência Artificial , Benchmarking , Atividades Humanas , Humanos
2.
Lancet Oncol ; 22(7): 970-976, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-34051879

RESUMO

BACKGROUND: The COVID-19 pandemic has disrupted health-care systems, leading to concerns about its subsequent impact on non-COVID disease conditions. The diagnosis and management of cancer is time sensitive and is likely to be substantially affected by these disruptions. We aimed to assess the impact of the COVID-19 pandemic on cancer care in India. METHODS: We did an ambidirectional cohort study at 41 cancer centres across India that were members of the National Cancer Grid of India to compare provision of oncology services between March 1 and May 31, 2020, with the same time period in 2019. We collected data on new patient registrations, number of patients visiting outpatient clinics, hospital admissions, day care admissions for chemotherapy, minor and major surgeries, patients accessing radiotherapy, diagnostic tests done (pathology reports, CT scans, MRI scans), and palliative care referrals. We also obtained estimates from participating centres on cancer screening, research, and educational activities (teaching of postgraduate students and trainees). We calculated proportional reductions in the provision of oncology services in 2020, compared with 2019. FINDINGS: Between March 1 and May 31, 2020, the number of new patients registered decreased from 112 270 to 51 760 (54% reduction), patients who had follow-up visits decreased from 634 745 to 340 984 (46% reduction), hospital admissions decreased from 88 801 to 56 885 (36% reduction), outpatient chemotherapy decreased from 173634 to 109 107 (37% reduction), the number of major surgeries decreased from 17 120 to 8677 (49% reduction), minor surgeries from 18 004 to 8630 (52% reduction), patients accessing radiotherapy from 51 142 to 39 365 (23% reduction), pathological diagnostic tests from 398 373 to 246 616 (38% reduction), number of radiological diagnostic tests from 93 449 to 53 560 (43% reduction), and palliative care referrals from 19 474 to 13 890 (29% reduction). These reductions were even more marked between April and May, 2020. Cancer screening was stopped completely or was functioning at less than 25% of usual capacity at more than 70% of centres during these months. Reductions in the provision of oncology services were higher for centres in tier 1 cities (larger cities) than tier 2 and 3 cities (smaller cities). INTERPRETATION: The COVID-19 pandemic has had considerable impact on the delivery of oncology services in India. The long-term impact of cessation of cancer screening and delayed hospital visits on cancer stage migration and outcomes are likely to be substantial. FUNDING: None. TRANSLATION: For the Hindi translation of the abstract see Supplementary Materials section.


Assuntos
COVID-19/terapia , Prestação Integrada de Cuidados de Saúde/tendências , Acesso aos Serviços de Saúde/tendências , Oncologia/tendências , Neoplasias/terapia , Assistência Ambulatorial/tendências , COVID-19/diagnóstico , Diagnóstico Tardio , Detecção Precoce de Câncer/tendências , Hospitalização/tendências , Hospitais com Alto Volume de Atendimentos/tendências , Humanos , Índia/epidemiologia , Neoplasias/diagnóstico , Neoplasias/epidemiologia , Aceitação pelo Paciente de Cuidados de Saúde , Fatores de Tempo , Tempo para o Tratamento , Listas de Espera
3.
Cancers (Basel) ; 12(10)2020 Oct 06.
Artigo em Inglês | MEDLINE | ID: mdl-33036292

RESUMO

The Ca2+ sensor STIM1 and the Ca2+ channel Orai1 that form the store-operated Ca2+ (SOC) channel complex are key targets for drug development. Selective SOC inhibitors are currently undergoing clinical evaluation for the treatment of auto-immune and inflammatory responses and are also deemed promising anti-neoplastic agents since SOC channels are linked with enhanced cancer cell progression. Here, we describe an investigation of the site of binding of the selective inhibitor Synta66 to the SOC channel Orai1 using docking and molecular dynamics simulations, and live cell recordings. Synta66 binding was localized to the extracellular site close to the transmembrane (TM)1 and TM3 helices and the extracellular loop segments, which, importantly, are adjacent to the Orai1-selectivity filter. Synta66-sensitivity of the Orai1 pore was, in fact, diminished by both Orai1 mutations affecting Ca2+ selectivity and permeation of Na+ in the absence of Ca2+. Synta66 also efficiently blocked SOC in three glioblastoma cell lines but failed to interfere with cell viability, division and migration. These experiments provide new structural and functional insights into selective drug inhibition of the Orai1 Ca2+ channel by a high-affinity pore blocker.

4.
Anal Biochem ; 610: 113996, 2020 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-33080213

RESUMO

Breast cancer is the most commonly occurring cancer among women which leads to thousands of deaths worldwide. The chances of survival are more if the breast cancer is diagnosed at early stage. At present, mammography, magnetic resonance imaging, ultrasound and tissue biopsies are the main diagnostic techniques available for the detection of breast cancer. However, despite of offering promising results, requirement of expensive setup, skilled supervision, expert analysis, invasive procedure (biopsy) and low capacity of multiplexing are the main limitations of these diagnostic techniques. Due to high cost, these screening tests are out of reach of people belonging to low socioeconomic groups and this poses serious health burden to the society. Recently, biosensor-based diagnostic technology for early detection of various types of cancers and other non-oncological disorders have gained considerable attention because of their several advantageous features over existing diagnostic technologies such as high throughput, noninvasive nature, cost effectiveness, easy interpretable results and capacity for multiplexing. Further, biosensors can be designed for biomarkers which are confined to particular type of cancer. In this review, we have discussed about various genomic, transcriptomic, proteomic and metabolomic biomarkers associated with breast cancer, various biosensors-based diagnostic approaches designed for detection of specific biomarkers associated with breast cancer are also described. Further, this review throws insight on various biomarkers linked with breast cancer which can be effectively exploited to develop new diagnostic technology. The assessment of these biomarkers associated with BC using biosensors in large population are cost-effective, non-invasive and high throughput. They help in risk assessment of disease at very initial stage even in backward areas and also help to lower the disease burden of society and economic cost of treatment for a common man. This review would provide new avenues for the development of biosensor based diagnostic technology for the detection of biomarkers associated with breast cancer.


Assuntos
Biomarcadores Tumorais/metabolismo , Técnicas Biossensoriais/métodos , Neoplasias da Mama/diagnóstico , Proteína BRCA1/genética , Proteína BRCA1/metabolismo , Biomarcadores Tumorais/sangue , Neoplasias da Mama/genética , Neoplasias da Mama/patologia , Técnicas Eletroquímicas , Feminino , Humanos , MicroRNAs/metabolismo , Estadiamento de Neoplasias , Receptor ErbB-2/sangue
5.
Biomed Res Int ; 2020: 1838140, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32923476

RESUMO

A hybrid brain computer interface (BCI) system considered here is a combination of electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS). EEG-fNIRS signals are simultaneously recorded to achieve high motor imagery task classification. This integration helps to achieve better system performance, but at the cost of an increase in system complexity and computational time. In hybrid BCI studies, channel selection is recognized as the key element that directly affects the system's performance. In this paper, we propose a novel channel selection approach using the Pearson product-moment correlation coefficient, where only highly correlated channels are selected from each hemisphere. Then, four different statistical features are extracted, and their different combinations are used for the classification through KNN and Tree classifiers. As far as we know, there is no report available that explored the Pearson product-moment correlation coefficient for hybrid EEG-fNIRS BCI channel selection. The results demonstrate that our hybrid system significantly reduces computational burden while achieving a classification accuracy with high reliability comparable to the existing literature.


Assuntos
Eletroencefalografia/métodos , Espectroscopia de Luz Próxima ao Infravermelho/métodos , Interfaces Cérebro-Computador , Humanos , Córtex Motor/fisiologia , Desempenho Psicomotor/fisiologia , Reprodutibilidade dos Testes
6.
Chemistry ; 26(47): 10769-10780, 2020 Aug 21.
Artigo em Inglês | MEDLINE | ID: mdl-32208534

RESUMO

The molecular recognition of carbohydrates by proteins plays a key role in many biological processes including immune response, pathogen entry into a cell, and cell-cell adhesion (e.g., in cancer metastasis). Carbohydrates interact with proteins mainly through hydrogen bonding, metal-ion-mediated interaction, and non-polar dispersion interactions. The role of dispersion-driven CH-π interactions (stacking) in protein-carbohydrate recognition has been underestimated for a long time considering the polar interactions to be the main forces for saccharide interactions. However, over the last few years it turns out that non-polar interactions are equally important. In this study, we analyzed the CH-π interactions employing bioinformatics (data mining, structural analysis), several experimental (isothermal titration calorimetry (ITC), X-ray crystallography), and computational techniques. The Protein Data Bank (PDB) has been used as a source of structural data. The PDB contains over 12 000 protein complexes with carbohydrates. Stacking interactions are very frequently present in such complexes (about 39 % of identified structures). The calculations and the ITC measurement results suggest that the CH-π stacking contribution to the overall binding energy ranges from 4 up to 8 kcal mol-1 . All the results show that the stacking CH-π interactions in protein-carbohydrate complexes can be considered to be a driving force of the binding in such complexes.


Assuntos
Carboidratos/química , Carbono/química , Biologia Computacional , Hidrogênio/química , Proteínas/química , Ligação de Hidrogênio , Técnicas In Vitro , Ligação Proteica , Termodinâmica
7.
Viruses ; 10(10)2018 10 18.
Artigo em Inglês | MEDLINE | ID: mdl-30340328

RESUMO

Viroids are smallest known pathogen that consist of non-capsidated, single-stranded non-coding RNA replicons and they exploits host factors for their replication and propagation. The severe stunting disease caused by Citrus bark cracking viroid (CBCVd) is a serious threat, which spreads rapidly within hop gardens. In this study, we employed comprehensive transcriptome analyses to dissect host-viroid interactions and identify gene expression changes that are associated with disease development in hop. Our analysis revealed that CBCVd-infection resulted in the massive modulation of activity of over 2000 genes. Expression of genes associated with plant immune responses (protein kinase and mitogen-activated protein kinase), hypersensitive responses, phytohormone signaling pathways, photosynthesis, pigment metabolism, protein metabolism, sugar metabolism, and modification, and others were altered, which could be attributed to systemic symptom development upon CBCVd-infection in hop. In addition, genes encoding RNA-dependent RNA polymerase, pathogenesis-related protein, chitinase, as well as those related to basal defense responses were up-regulated. The expression levels of several genes identified from RNA sequencing analysis were confirmed by qRT-PCR. Our systematic comprehensive CBCVd-responsive transcriptome analysis provides a better understanding and insights into complex viroid-hop plant interaction. This information will assist further in the development of future measures for the prevention of CBCVd spread in hop fields.


Assuntos
Humulus/virologia , Doenças das Plantas/genética , Proteínas de Plantas/genética , Vírus de Plantas/fisiologia , Viroides/fisiologia , Perfilação da Expressão Gênica , Regulação da Expressão Gênica de Plantas , Humulus/genética , Humulus/metabolismo , Doenças das Plantas/virologia , Folhas de Planta/genética , Folhas de Planta/metabolismo , Folhas de Planta/virologia , Proteínas de Plantas/metabolismo , Vírus de Plantas/genética , Vírus de Plantas/isolamento & purificação , Viroides/classificação , Viroides/genética , Viroides/isolamento & purificação
8.
PLoS One ; 12(12): e0189375, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-29232414

RESUMO

Protein-carbohydrate interactions are very often mediated by the stacking CH-π interactions involving the side chains of aromatic amino acids such as tryptophan (Trp), tyrosine (Tyr) or phenylalanine (Phe). Especially suitable for stacking is the Trp residue. Analysis of the PDB database shows Trp stacking for 265 carbohydrate or carbohydrate like ligands in 5 208 Trp containing motives. An appropriate model system to study such an interaction is the AAL lectin family where the stacking interactions play a crucial role and are thought to be a driving force for carbohydrate binding. In this study we present data showing a novel finding in the stacking interaction of the AAL Trp side chain with the carbohydrate. High resolution X-ray structure of the AAL lectin from Aleuria aurantia with α-methyl-l-fucoside ligand shows two possible Trp side chain conformations with the same occupation in electron density. The in silico data shows that the conformation of the Trp side chain does not influence the interaction energy despite the fact that each conformation creates interactions with different carbohydrate CH groups. Moreover, the PDB data search shows that the conformations are almost equally distributed across all Trp-carbohydrate complexes, which would suggest no substantial preference for one conformation over another.


Assuntos
Metabolismo dos Carboidratos , Lectinas/metabolismo , Triptofano/metabolismo , Cristalografia por Raios X , Bases de Dados de Proteínas , Lectinas/química , Conformação Proteica , Triptofano/química
9.
J Cytol ; 33(1): 17-21, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27011436

RESUMO

OBJECTIVES: Fine-needle aspiration cytology (FNAC) is a first-line investigation in the evaluation of neck nodules. In an attempt to search for reliable cytomorphological criteria for parathyroid lesions, we systematically evaluated cytomorphology of FNAC of parathyroid lesions. STUDY DESIGN: FNAC of 15 parathyroid and 15 hyperplastic thyroid nodules with histological confirmation were reviewed for following features: Cellularity, follicles, bare nuclei, cohesiveness, vascular profiles, cytoplasmic granularity, intracytoplasmic vacuolation, mitosis, macrophages, and colloid. RESULTS: Vascular proliferation, bare nuclei, intracytoplasmic fat vacuolation, absence of colloid, and high cellularity showed significant association with parathyroid lesions (P ≤ 0.05). Intracytoplasmic fat vacuolation was 53.3% sensitive and 100% specific for parathyroid. Follicular pattern and papillaroid clusters were also important; however, they achieved nearly significant statistical difference (P = 0.05 and P = 0.06, respectively). The combination of vascular proliferation and intracytoplasmic fat vacuolation were significantly associated with parathyroid (P = 0.006) whereas the absence of bare nuclei and the presence of background colloid were associated with thyroid cytomorphology (P = 0.03). CONCLUSION: No single cytological feature is helpful in differentiating parathyroid from thyroid lesion. Vascular proliferation, bare nuclei, intracytoplasmic fat vacuolation, high cellularity, and the absence of colloid were significantly associated with the parathyroid origin. The combination of at least two features - vascular proliferation and intracytoplasmic fat vacuoles - were highly suggestive of parathyroid origin.

12.
Chem Commun (Camb) ; 48(71): 8922-4, 2012 Sep 14.
Artigo em Inglês | MEDLINE | ID: mdl-22850490

RESUMO

This communication describes a set of hybrid foldamers that do not feature inter-residual, but intra-residual backbone hydrogen-bonding, yet adopt a preferentially folded conformation displaying right-handed helical architecture. Conformational ordering is apparently due to the combined conformational restrictions imposed by the conformationally restricted individual amino acid residues with which the oligomers are made of.


Assuntos
Aminoácidos/química , Ácidos Carboxílicos/química , Cristalografia por Raios X , Hidrogênio/química , Ligação de Hidrogênio , Peptídeos/química , Peptídeos/metabolismo , Dobramento de Proteína , Estrutura Secundária de Proteína , Tiofenos/química
13.
Cancer ; 116(8): 2031-5, 2010 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-20162717

RESUMO

BACKGROUND: Mucositis, a radiotherapy-associated toxicity, is an important factor determining morbidity and treatment compliance. Gastrointestinal mucositis in patients undergoing radiotherapy may also depend on time of administration of radiation in addition to several other factors. The presence of any correlation between the severity of acute gastrointestinal mucositis in cervical carcinoma patients and the time of irradiation was prospectively evaluated. METHODS: A total of 229 patients with cervical carcinoma were randomized to morning (8:00-10:00 AM) and evening (6:00-8:00 PM) arms. The incidence of mucositis in the 2 arms was assessed and reported in terms of various grades of diarrhea. RESULTS: Overall (grade I-IV) as well as higher grade (III and IV) diarrhea was found to be significantly increased in the morning arm as compared with the evening arm (overall: 87.39 % vs 68.18 %, P < .01; higher grade: 14.29% vs 5.45%, P < .05). Other radiation-induced toxicity was also higher in the morning arm, but its occurrence in the 2 arms did not differ significantly (13.45% vs 12.73%, P > .05). After completion of treatment, patients' response to radiation in the 2 arms was similar (P > .05). CONCLUSIONS: The significant difference in the incidence of higher grade diarrhea between the morning and evening arms is indirect evidence of the influence of circadian rhythm on the intestinal mucosa of the human intestine. This knowledge may facilitate treating patients with decreased toxicity to the intestinal mucosa.


Assuntos
Mucosa Intestinal/patologia , Mucosite/etiologia , Lesões por Radiação/fisiopatologia , Radioterapia/métodos , Neoplasias do Colo do Útero/radioterapia , Feminino , Humanos , Pessoa de Meia-Idade , Mucosite/fisiopatologia , Radioterapia/efeitos adversos , Tempo
14.
Oncol Res ; 17(8): 367-72, 2009.
Artigo em Inglês | MEDLINE | ID: mdl-19544973

RESUMO

Interleukins and cytokines are important regulator of the aetio-pathogenesis of the majority of cancers. Mechanistic role of IL-1RN and IL-4, particularly in breast carcinogenesis, is well documented. However, the role of polymorphisms of IL-1RN and IL-4 combinations associated with risk of breast cancer is not reported. The IL-1RN and IL-4 gene polymorphisms were genotyped with VNTR-PCR in 100 patients (benign tumor n = 32 and breast cancer n = 68) and 200 normal healthy control subjects with normal mammogram. Genotype distribution and allelic frequencies between patients and controls were compared and odds ratios (OR) with 95% confidence intervals (CI) were calculated using SPSS software (version 12.0). There were no significant differences in the genotype distributions of both IL-1RN and IL-4 polymorphisms between cases and controls. Similarly, subgroup analysis showed that there is no significant association for pre- and postmenopausal women. However, BB genotype of IL-1RN significantly differs among benign and malignant stages of breast cancer. IL-1RN and IL-4 polymorphisms alone or in combination are not associated with risk of breast cancer in Indian patients. The association of IL-1RN with malignant stages may indicate its possible role in progression of breast cancer. Further studies in other population are needed to confirm our findings and to elucidate the role of IL-1RN in progression of breast cancer.


Assuntos
Neoplasias da Mama/genética , Predisposição Genética para Doença , Interleucina-1/genética , Interleucina-4/genética , Polimorfismo Genético , Adulto , Idoso , Idoso de 80 Anos ou mais , Estudos de Casos e Controles , Feminino , Frequência do Gene , Genótipo , Humanos , Índia , Pessoa de Meia-Idade , Pós-Menopausa/genética , Pré-Menopausa/genética , Fatores de Risco
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...