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1.
J Microencapsul ; 41(5): 345-359, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38780157

RESUMO

AIM: The present work is focus on development of anti-psoriasis activity of Karanjin (isolated from Pongamia pinnata seed oil) loaded liposome based lotion for enhancement of skin permeation and retention. METHOD: Karanjin was isolated using liquid-liquid extraction method and characterised by HPLC analysis and partition coefficient. Further, isolated Karanjin was loaded into liposomes using thin-film hydration technique and optimised by Box-Behnken design. Selected optimised batch was characterised their mean diameter, PDI, zeta potential, and entrapment efficiency, morphology (by TEM), FTIR and ex-vivo skin retention. Additionally, Karanjin loaded liposomes were formulated into lotion and characterise their rheological, spreadability, texture, ex-vivo skin permeation & retention, stability and anti-psoriatic activity in mouse tail model. RESULT: The yield of Karanjin from seed oil was 0.1% w/v and have lipophilic nature. The optimised liposomal formulation showed 195 ± 1.8 nm mean diameter, 0.271 ± 0.02 PDI, -27.0 ± 2.1 mV zeta potential and 61.97 ± 2.5% EE. TEM image revel the spherical shap of liposome surrounded by single phospholipid bilayer and no interection between drug and excipients. Further, lotion was prepared by 0.1% w/v carbopol and found to 615 mPa.sec viscosity, good thixotropic behaviour, spreadability and texture. There was 22.44% increase in drug permeation for Karanjin loaded liposomal lotion compared to pure Karanjin lotion, confirm by ex-vivo permeation and retention. While, in-vivo study revel the liposomal lotion of Karanjin was found to have 16.09% higher drug activity then 5% w/w conventional Karanjin lotion. CONCLUSION: Karanjin loaded liposomal lotion have an effective anti-psoriatic agent and showed better skin permeation and retention than the conventional Karanjin lotion.


Assuntos
Lipossomos , Psoríase , Absorção Cutânea , Animais , Camundongos , Psoríase/tratamento farmacológico , Modelos Animais de Doenças , Administração Cutânea , Pele , Masculino
2.
Chem Biodivers ; 20(2): e202201038, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36644820

RESUMO

Stress is the body's reaction to the challenges it faces, and it produces a multitude of chemical molecules known as stressors as a result of these reactions. It's also a misalignment of the sympathetic and parasympathetic nervous systems causing changes in a variety of physiological reactions and perhaps leading to stress disorders. The reduction in neurotransmitter & neurohormonal hormones is mainly governed by the nociceptin receptor as G-protein coupled receptor and increased the level of reactive oxygen species. Various synthetic medicines that target nociceptin receptors were utilized to reduce the effects of stress but they come up with a variety of side effects. Because of the widespread utilization and renewed interest in medicinal herbal plants considered to be alternative antistress therapy. Our present work is an approach to decipher the molecular nature of novel herbal leads by targeting nociceptin receptor, under which herbal compounds were screened and validated through in-silico methods. Among screened leads, withanolide-B showed stable association in the active site of the nociceptin receptor as an antistress agent with no side effects. Furthermore, the selected lead was also evaluated for stability by molecular dynamic stimulation as well as for pharmacokinetics and toxicity profile. It has been concluded stable conformation of withanolide-B without presence of any major toxic effects. As a result, the in silico molecular docking technique is a highly successful method for selecting a prospective herbal lead molecule with respect to a specific target, and future research can pave the way for further exploration in the drug development field.


Assuntos
Plantas Medicinais , Vitanolídeos , Receptor de Nociceptina , Receptores Opioides , Simulação de Acoplamento Molecular , Estudos Prospectivos
3.
Int J Mol Sci ; 24(4)2023 Feb 06.
Artigo em Inglês | MEDLINE | ID: mdl-36834597

RESUMO

Currently, there is a great demand for the development of nanomedicine aided wound tissue regeneration via silver doped nanoceuticals. Unfortunately, very little research is being carried out on antioxidants-doped silver nanometals and their interaction on the signaling axis during the bio-interface mechanism. In this study, c-phycocyanin primed silver nano hybrids (AgcPCNP) were prepared and analyzed for properties such as cytotoxicity, metal decay, nanoconjugate stability, size expansion, and antioxidant features. Fluctuations in the expression of marker genes during cell migration phenomena in in vitro wound healing scenarios were also validated. Studies revealed that physiologically relevant ionic solutions did not exhibit any adverse effects on the nanoconjugate stability. However, acidic, alkali, and ethanol solutions completely denatured the AgcPCNP conjugates. Signal transduction RT2PCR array demonstrated that genes associated with NFĸB- and PI3K-pathways were significantly (p < 0.5%) altered between AgcPCNP and AgNP groups. Specific inhibitors of NFĸB (Nfi) and PI3K (LY294002) pathways confirmed the involvement of NFĸB signaling axes. In vitro wound healing assay demonstrated that NFĸB pathway plays a prime role in the fibroblast cell migration. In conclusion, the present investigation revealed that surface functionalized AgcPCNP accelerated the fibroblast cell migration and can be further explored for wound healing biomedical applications.


Assuntos
Nanocompostos , Prata , Prata/farmacologia , Ficocianina/metabolismo , Fosfatidilinositol 3-Quinases/metabolismo , Proteína C/metabolismo , Nanoconjugados , Transdução de Sinais , Movimento Celular
4.
Molecules ; 28(22)2023 Nov 14.
Artigo em Inglês | MEDLINE | ID: mdl-38005310

RESUMO

Neurological ailments, including stroke, Alzheimer's disease (AD), epilepsy, Parkinson's disease (PD), and other related diseases, have affected around 1 billion people globally to date. PD stands second among the common neurodegenerative diseases caused as a result of dopaminergic neuron loss in the midbrain's substantia nigra regions. It affects cognitive and motor activities, resulting in tremors during rest, slow movement, and muscle stiffness. There are various traditional approaches for the management of PD, but they provide only symptomatic relief. Thus, a survey for finding new biomolecules or substances exhibiting the therapeutic potential to patients with PD is the main focus of present-day research. Medicinal plants, herbal formulations, and natural bioactive molecules have been gaining much more attention in recent years as synthetic molecules orchestrate a number of undesired effects. Several in vitro, in vivo, and in silico studies in the recent past have demonstrated the therapeutic potential of medicinal plants, herbal formulations, and plant-based bioactives. Among the plant-based bioactives, polyphenols, terpenes, and alkaloids are of particular interest due to their potent anti-inflammatory, antioxidant, and brain-health-promoting properties. Further, there are no concise, elaborated articles comprising updated mechanism-of-action-based reviews of the published literature on potent, recently investigated (2019-2023) medicinal plants, herbal formulations, and plant based-bioactive molecules, including polyphenols, terpenes, and alkaloids, as a method for the management of PD. Therefore, we designed the current review to provide an illustration of the efficacious role of various medicinal plants, herbal formulations, and bioactives (polyphenols, terpenes, and alkaloids) that can become potential therapeutics against PD with greater specificity, target approachability, bioavailability, and safety to the host. This information can be further utilized in the future to develop several value-added formulations and nutraceutical products to achieve the desired safety and efficacy for the management of PD.


Assuntos
Alcaloides , Doenças Neurodegenerativas , Doença de Parkinson , Plantas Medicinais , Humanos , Doença de Parkinson/tratamento farmacológico , Alcaloides/farmacologia , Alcaloides/uso terapêutico , Terpenos/farmacologia , Terpenos/uso terapêutico
5.
Anal Chem ; 94(2): 1011-1021, 2022 01 18.
Artigo em Inglês | MEDLINE | ID: mdl-34920665

RESUMO

Point-of-care diagnostics often use isothermal nucleic acid amplification for qualitative detection of pathogens in low-resource healthcare settings but lack sufficient precision for quantitative applications such as HIV viral load monitoring. Although viral load (VL) monitoring is an essential component of HIV treatment, commercially available tests rely on relatively high-resource chemistries like real-time polymerase chain reaction and are thus used on an infrequent basis for millions of people living with HIV in low-income countries. To address the constraints of low-resource settings on nucleic acid quantification, we describe a recombinase polymerase amplification and lateral flow detection approach that quantifies HIV-1 DNA or RNA by comparison to a competitive internal amplification control (IAC) of a known copy number, which may be set to any useful threshold (in our case, a clinically relevant threshold for HIV treatment failure). The IAC is designed to amplify alongside the HIV target with a similar efficiency, allowing for normalization of the assay to variation or inhibition and enabling an endpoint readout that is compatible with commercially available kits for nucleic acid lateral flow detection and interpretable with minimal instrumentation or by the naked eye. We find that this approach can reliably differentiate ≤600 or ≥1400 copies of HIV DNA from a 1000-copy threshold when lateral flow strips are imaged with a conventional office scanner and analyzed with free densitometry software. We further demonstrate a user-friendly adaptation of this analysis to process cell phone photographs with an automated script. Alternatively, we show via a survey that 21 minimally trained volunteers could reliably resolve ≥10-fold (log10) differences of HIV DNA or RNA by naked eye interpretation of lateral flow results. This amplification and detection workflow requires minimal instrumentation, takes just 30 min to complete, and when combined with a suitable sample preparation method, may enable HIV VL testing while the patient waits or a self-test, which has the potential to improve care. This approach may be adapted for other applications that require quantitative analysis of a nucleic acid target in low-resource settings.


Assuntos
Infecções por HIV , Técnicas de Amplificação de Ácido Nucleico , Infecções por HIV/diagnóstico , Humanos , Técnicas de Amplificação de Ácido Nucleico/métodos , Testes Imediatos , RNA Viral/genética , Recombinases , Carga Viral
6.
J Immunoassay Immunochem ; 43(1): 1951291, 2022 Jan 02.
Artigo em Inglês | MEDLINE | ID: mdl-34355645

RESUMO

The unending outburst of COVID-19 has reinforced the necessity of SARS-CoV-2 identification approaches for the prevention of infection transmission and the proper care of severe and critical patients. As there is no cure, a prompt and reliable diagnosis of SARS-CoV2 is vital to counter the spread and to provide adequate care and treatment for the infection. Currently, RT-PCR is a gold standard detection method for the qualitative and quantitative detection of viral nucleic acids. Besides, enzyme-linked immunosorbent assay is also a primarily used method for qualitative estimation of viral load. However, almost all the detection methods have their pros and cons in terms of specificity, accuracy, sensitivity, cost, time consumption, the need for sophisticated laboratories, and the requirement of skilled technical experts to carry out the detection tests. Thus, it is suggested to integrate different techniques to enhance the detection efficiency and accurateness for SARS-CoV2. This review focuses on preliminary, pre-confirmatory, and confirmatory methods of detection such as imaging techniques (chest-X-ray and chest- computed tomography), nucleic acid detection methods, serological assay methods, and viral culture and identification methods that are currently being employed to detect the presence of SARS-CoV-2 infection along with recent detection method and applicability for COVID-19.


Assuntos
Teste para COVID-19/métodos , COVID-19 , SARS-CoV-2/isolamento & purificação , COVID-19/diagnóstico , Teste de Ácido Nucleico para COVID-19 , Ensaio de Imunoadsorção Enzimática , Humanos , RNA Viral , Radiografia Torácica , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Sensibilidade e Especificidade , Testes Sorológicos , Tomografia Computadorizada por Raios X
7.
Drug Dev Ind Pharm ; 48(1): 21-28, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-35703403

RESUMO

Migraine is a frequent neurological condition characterized by throbbing headaches, nausea, photophobia, and phonophobia, among other symptoms. Sumatriptan belongs to a BCS class III, which exhibits poor oral bioavailability and several side-effects. The objective of the present study was to develop solid lipid nanoparticles (SLNPs) of sumatriptan succinate for brain targeting by nasal route. Solvent injection method was used to increase the entrapment efficiency of hydrophilic drug. Thus, formulation was optimized by central composite design with minimum particle size, optimized zeta potential, and maximum entrapment efficiency, which was found to be 133.4 nm, -17.7 mV, and 75.5%, respectively. Optimized batch was further evaluated for surface morphology, Fourier-transform infrared spectroscopy, in vitro release, permeation across nasal mucosa, and histopathology. It was seen that most of the particles were spherical in shape as confirmed by scanning electron microscopy and transmission electron microscopy. The release of drug through the lipid showed initial burst release followed by sustained release up to 12 h. The ex vivo diffusion study using goat nasal mucosa at pH 6.8 revealed that SLNPs permeation across nasal mucosa was quick, which was sufficient for brain targeting. Histopathology studies further revealed integrity of nasal mucosa after treatment with SLNPs. The investigation indicated that hydrophilic drug, sumatriptan succinate can be successfully entrapped in SLNPs to target brain via nasal delivery, and thus it could be an effective approach for nose-to-brain delivery.


Assuntos
Nanopartículas , Sumatriptana , Administração Intranasal , Encéfalo , Portadores de Fármacos/química , Sistemas de Liberação de Medicamentos/métodos , Lipossomos , Nanopartículas/química , Mucosa Nasal , Tamanho da Partícula , Polímeros , Sumatriptana/química , Sumatriptana/farmacologia
8.
J Microencapsul ; 39(4): 299-313, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35470755

RESUMO

AIM: The current study focussed on the development and evaluation of aqueous core nanocapsules (ACNs) as an effective carrier to deliver an optimal synergistic combination of a highly water-soluble Vinorelbine bitartrate (VRL) and a poorly water-soluble Resveratrol (RES) for treatment of breast cancer. METHODS: Various molar ratios of VRL to RES were screened against MCF-7 cell lines to determine the synergistic effects using the Chou-Talalay method. The synergistic ratio of therapeutic agents was then incorporated into aqueous core nanocapsules utilising a double emulsion solvent evaporation technique to yield dual drug-loaded nanocapsules (dd-ACNs). The dd-ACNs were optimised using Box-Behnken design and characterised for physicochemical parameters such as particle size, zeta potential, polydispersity index, total drug content and encapsulation efficiency, surface morphology, drug excipient compatibility by FTIR and DSC, release kinetics, toxicity studies and anticancer efficacy (in-vitro and in-vivo). RESULTS: Results demonstrated that the combination exhibited maximum synergy when higher doses of VRL were combined with smaller doses of RES (1:1, 5:1, and 10:1). The dual drug-loaded ACNs were found to be stable and depicted a core-shell structure, narrow size range (150.2 ± 3.2 nm) with enhanced encapsulation (80% for VRL and 99% for RES). Moreover, the dd-ACNs were 5 times more efficacious in-vitro than a combination of free drugs, while reducing systemic toxicity. Also, pre-clinical evaluation of dd-ACNs also depicted a drastic reduction of tumour volume as compared tp pristine VRL and a physical combination of drugs. CONCLUSION: The developed dd-ACNs can be applied as a potential carrier for delivery of a combination of chemotherapeutics at a synergistic ratio at the tumour site.


Assuntos
Neoplasias da Mama , Nanocápsulas , Neoplasias da Mama/tratamento farmacológico , Feminino , Humanos , Nanocápsulas/química , Polímeros , Resveratrol/farmacologia , Vinorelbina , Água/química
9.
J Microencapsul ; 39(4): 352-363, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35635238

RESUMO

AIM: The research focussed on development and evaluation of ethosome as an effective delivery of antigen that eliminates need for frequent dose of antigen while improving patient compliance for Hepatitis B. METHOD: Prepared a single dose HBsAg ethosomal vaccine using a cold method and applied a central composite design optimisation using particles size, zeta potential and entrapment efficiency as dependent variables. Further, selected batch was assessed for their morphology, in vitro release, interaction, haemocompatibility, histological (ex vivo skin permeation) and stability studies. Further, proceeded for in-vivo study, administered in BALB/c mice via nasal route to check the immunological activity and compared with single and multiple doses of ethosome to booster doses of alum-HBsAg vaccine. Immunological marker like immunoglobulin (IgG and IgA) and cytokines (interleukin-2 and interferon-Y) were measured by ELISA techniques. RESULTS: The prepared ethosome showed minimum particle size (93.98 ± 4.6), 15.0 ± 2.83 mV zeta potential, with maximum entrapment efficiency (66.25 ± 8.6%). Physicochemical characterisation reveal the sustained release, haemocampatibile, and stable nature of ethosome. Further, ex-vivo skin permeation showed safely administration of drug by nasal route without toxicity. The in vivo study, found the higher immunological response observed in BALB/c mice, compare to alum-HBsAg vaccine. The single dose of ethosome showed sufficient effective and measurable immunoglobulin and cytokines levels. CONCLUSION: A single dose of ethosome is sufficient for the complete immunological response not require booster administration. The potency of ethosomes have to produce a protective immune response, as well as their ability to explore and target the immunological environment through nasal route.


Assuntos
Antígenos de Superfície da Hepatite B , Hepatite B , Administração Intranasal , Animais , Hepatite B/prevenção & controle , Camundongos , Camundongos Endogâmicos BALB C , Pele
10.
Physica A ; 604: 127915, 2022 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-35874925

RESUMO

In this work, we construct a new SARS-CoV-2 mathematical model of SQIR type. The considered model has four compartments as susceptible S , quarantine Q , infected I and recovered R . Here saturated nonlinear incidence rate is used for the transmission of the disease. We formulate our model first and then the disease-free and endemic equilibrium (EE) are calculated. Further, the basic reproduction number is computed via the next generation matrix method. Also on using the idea of Dulac function, the global stability for the proposed model is discussed. By using the Routh-Hurwitz criteria, local stability is investigated. Through nonstandard finite difference (NSFD) scheme, numerical simulations are performed. Keeping in mind the significant importance of fractional calculus in recent time, the considered model is also investigated under fractional order derivative in Caputo sense. Finally, numerical interpretation of the model by using various fractional order derivatives are provided. For fractional order model, we utilize fractional order NSFD method. Comparison with some real data is also given.

11.
Molecules ; 27(23)2022 Nov 28.
Artigo em Inglês | MEDLINE | ID: mdl-36500379

RESUMO

Coronavirus Disease-2019 (COVID-19) is a highly contagious disease caused by Severe Acute Respiratory Syndrome-Coronavirus-2 (SARS-CoV-2). The World Health Organization (WHO) classified the disease a as global public health hazard on 11 March 2020. Currently, there are no adequate measures to combat viral infections, including COVID-19, and the medication guidelines for the management of COVID-19 are dependent on previous findings from SARS-CoV and MERS-CoV research. Natural products have achieved widespread acceptance around the world as a means of enhancing healthcare and disease prevention. Plants are a potential source of antiviral factors such as flavonoids, phenolic acids, terpenoids, and others. Some of these agents exhibit a broad spectrum of antiviral activity. This study aimed to screen herbal leads for possible inhibitors of the SARS-CoV-2 ADP Ribose Phosphatase enzyme (ARP). Guggulsterone was found to be highly stabilized within the active site of the viral ARP enzyme by molecular dynamic simulation with very little fluctuation throughout the simulation timeframe of 100 ns. Thus, guggulsterone can be further used to develop a safe and competent medication for evolving therapy against SARS-CoV-2 in post-preclinical and clinical trials.


Assuntos
COVID-19 , Coronavírus da Síndrome Respiratória do Oriente Médio , Humanos , SARS-CoV-2 , Adenosina Difosfato Ribose , Monoéster Fosfórico Hidrolases , Antivirais/química
12.
Bioorg Chem ; 109: 104639, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33618829

RESUMO

Quinoline is a versatile pharmacophore, a privileged scaffold and an outstanding fused heterocyclic compound with a wide range of pharmacological prospective such as anticancer, anti-inflammatory, antibacterial, antiviral drug and superlative moiety in drug discovery. The quinoline hybrids have already been shown excellent results with new targets with a different mode of actions as an inhibitor of cell proliferation by cell cycle arrest, apoptosis, angiogenesis, disruption of cell migration and modulation. This review emphasized the mode of action, structure activity relationship and molecular docking to reveal the various active pharmacophores of quinoline hybrids accountable for novel anticancer, anti-inflammatory, antibacterial and miscellaneous activities. Therefore, several quinoline candidates are under clinical trials for the treatment of certain diseases, for example ferroquine (antimalarial), dactolisib (antitumor) and pelitinib (EGFR TK inhibitors) etc. Plenty of research has been summarized the recent advances of quinoline derivatives and explore the various therapeutic prospects of this moiety. This review would help the researchers to strategically design diverse novel quinoline derivatives for the development of clinically viable drug candidates for the treatment of incurable diseases.


Assuntos
Desenho de Fármacos , Quinolinas/química , Quinolinas/farmacologia , Humanos , Simulação de Acoplamento Molecular , Estrutura Molecular , Relação Estrutura-Atividade
13.
Chaos Solitons Fractals ; 143: 110585, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33390671

RESUMO

We develop a new mathematical model by including the resistive class together with quarantine class and use it to investigate the transmission dynamics of the novel corona virus disease (COVID-19). Our developed model consists of four compartments, namely the susceptible class, S ( t ) , the healthy (resistive) class, H ( t ) , the infected class, I ( t ) and the quarantine class, Q ( t ) . We derive basic properties like, boundedness and positivity, of our proposed model in a biologically feasible region. To discuss the local as well as the global behaviour of the possible equilibria of the model, we compute the threshold quantity. The linearization and Lyapunov function theory are used to derive conditions for the stability analysis of the possible equilibrium states. We present numerical simulations to support our investigations. The simulations are compared with the available real data for Wuhan city in China, where the infection was initially originated.

14.
Anal Chem ; 92(19): 13066-13072, 2020 10 06.
Artigo em Inglês | MEDLINE | ID: mdl-32813501

RESUMO

Nucleic acid amplification tests (NAATs) are common in laboratory and clinical settings because of their low time to result and exquisite sensitivity and specificity. Laboratory NAATs include onboard positive controls to reduce false negatives and specialized hardware to enable real-time fluorescence detection. Recent efforts to translate NAATs into at-home tests sacrifice one or more of the benefits of laboratory NAATs, such as sensitivity, internal amplification controls (IACs), or time to result. In this manuscript, we describe a mobile-phone-based strategy for real-time imaging of biplexed NAATs in paper. The strategy consisted of: (1) using mobile phones with multipass excitation and emission filters on the flash and camera to image the signal from distinct fluorophore-labeled probe types in a biplexed NAAT in a glass fiber membrane; and (2) analyzing the differential fluorescence signal between the red and green color channels of phone images to overcome a strong evaporation-induced optical artifact in heated glass fiber pads due to changes in the refractive index. We demonstrated that differential fluorescence imaging enabled low limits of detection (316 copies of methicillin-resistant Staphylococcus aureus DNA) in our lab's "MD NAAT" platform, even in biplexed isothermal strand displacement amplification reactions containing 100k copies of coamplifying IAC DNA templates. These results suggest that two-fluorophore mobile phone imaging may enable translating the benefits of extant laboratory-based, real-time NAATs to the point of care.


Assuntos
Telefone Celular , DNA Bacteriano/análise , Fluorescência , Staphylococcus aureus Resistente à Meticilina/química , Técnicas de Amplificação de Ácido Nucleico , Imagem Óptica , Tamanho da Partícula , Porosidade , Propriedades de Superfície , Fatores de Tempo
15.
Analyst ; 145(21): 6875-6886, 2020 Oct 26.
Artigo em Inglês | MEDLINE | ID: mdl-32820749

RESUMO

Nucleic acid amplification test (NAAT)-based point-of-care (POC) devices are rapidly growing for use in low-resource settings. However, key challenges are the ability to store the enzyme-based reagents in dry form in the device and the long-term stability of those reagents at elevated temperatures, especially where ambient temperatures could be as high as 45 °C. Here, we describe a set of excipients including a combination of trehalose, polyethylene glycol and dextran, and a method for using them that allows long-term dry storage of enzyme-based reagents for an isothermal strand displacement amplification (iSDA) reaction in a porous matrix. Various porous materials, including nitrocellulose, cellulose, and glass fiber, were tested. Co-dried reagents for iSDA always included those that amplified the ldh1 gene in Staphylococcus aureus (a polymerase and a nicking enzyme, 4 primers, dNTPs and a buffer). Reagents also either included a capture probe and a streptavidin-Au label required for lateral flow (LF) detection after amplification, or a fluorescent probe used for real-time detection. The reagents showed the best stability in a glass fiber matrix when stored in the presence of 10% trehalose and 2.5% dextran. The reagents were stable for over a year at ∼22 °C as determined by lateral flow detection and gel electrophoresis. The reagents also exhibited excellent stability after 360 h at 45 °C; the assay still detected as few as 10 copies of ldh1 gene target by lateral flow detection, and 50 copies with real-time fluorescence detection. These results demonstrate the potential for incorporation of amplification reagents in dry form in point-of-care devices for use in a wide range of settings.


Assuntos
Ácidos Nucleicos , Sistemas Automatizados de Assistência Junto ao Leito , Indicadores e Reagentes , Técnicas de Amplificação de Ácido Nucleico , Testes Imediatos , Porosidade
16.
Chaos Solitons Fractals ; 140: 110232, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32863613

RESUMO

This paper is devoted to investigation of the fractional order fuzzy dynamical system, in our case, modeling the recent pandemic due to corona virus (COVID-19). The considered model is analyzed for exactness and uniqueness of solution by using fixed point theory approach. We have also provided the numerical solution of the nonlinear dynamical system with the help of some iterative method applying Caputo as well as Attangana-Baleanu and Caputo fractional type derivative. Also, random COVID-19 model described by a system of random differential equations was presented. At the end we have given some numerical approximation to illustrate the proposed method by applying different fractional values corresponding to uncertainty.

17.
Chaos Solitons Fractals ; 135: 109867, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32390692

RESUMO

The major purpose of the presented study is to analyze and find the solution for the model of nonlinear fractional differential equations (FDEs) describing the deadly and most parlous virus so-called coronavirus (COVID-19). The mathematical model depending of fourteen nonlinear FDEs is presented and the corresponding numerical results are studied by applying the fractional Adams Bashforth (AB) method. Moreover, a recently introduced fractional nonlocal operator known as Atangana-Baleanu (AB) is applied in order to realize more effectively. For the current results, the fixed point theorems of Krasnoselskii and Banach are hired to present the existence, uniqueness as well as stability of the model. For numerical simulations, the behavior of the approximate solution is presented in terms of graphs through various fractional orders. Finally, a brief discussion on conclusion about the simulation is given to describe how the transmission dynamics of infection take place in society.

18.
Chaos Solitons Fractals ; 138: 109926, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32501377

RESUMO

In this paper, we have conducted analysis based on data obtained from National Institute of Health (NIH) - Islamabad and produced a forecast of COVID-19 confirmed cases as well as the number of deaths and recoveries in Pakistan using the Auto-Regressive Integrated Moving Average Model (ARIMA). The fitted forecasting models revealed high exponential growth in the number of confirmed cases, deaths and recoveries in Pakistan. Based on our model prediction the number of confirmed cases will be increased by 2.7 times, 95% prediction interval for the number of cases at the end of May 2020 = (5681 to 33079). There could be up to 500 deaths, 95% prediction interval = (168 to 885) and there could be eightfold increase in the number of recoveries, 95% prediction interval = (2391 to 16126). The forecasting results of COVID-19 are alarming for May in Pakistan. The health officials and government should adopt new strategies to control the pandemic from further spread until a proper treatment or vaccine is developed.

19.
Chaos Solitons Fractals ; 139: 110256, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32905156

RESUMO

In this article, the mathematical model with different compartments for the transmission dynamics of coronavirus-19 disease (COVID-19) is presented under the fractional-order derivative. Some results regarding the existence of at least one solution through fixed point results are derived. Then for the concerned approximate solution, the modified Euler method for fractional-order differential equations (FODEs) is utilized. Initially, we simulate the results by using some available data for different fractional-order to show the appropriateness of the proposed method. Further, we compare our results with some reported real data against confirmed infected and death cases per day for the initial 67 days in Wuhan city.

20.
Kidney Int ; 95(4S): S1-S33, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-30904051

RESUMO

The global nephrology community recognizes the need for a cohesive strategy to address the growing problem of end-stage kidney disease (ESKD). In March 2018, the International Society of Nephrology hosted a summit on integrated ESKD care, including 92 individuals from around the globe with diverse expertise and professional backgrounds. The attendees were from 41 countries, including 16 participants from 11 low- and lower-middle-income countries. The purpose was to develop a strategic plan to improve worldwide access to integrated ESKD care, by identifying and prioritizing key activities across 8 themes: (i) estimates of ESKD burden and treatment coverage, (ii) advocacy, (iii) education and training/workforce, (iv) financing/funding models, (v) ethics, (vi) dialysis, (vii) transplantation, and (viii) conservative care. Action plans with prioritized lists of goals, activities, and key deliverables, and an overarching performance framework were developed for each theme. Examples of these key deliverables include improved data availability, integration of core registry measures and analysis to inform development of health care policy; a framework for advocacy; improved and continued stakeholder engagement; improved workforce training; equitable, efficient, and cost-effective funding models; greater understanding and greater application of ethical principles in practice and policy; definition and application of standards for safe and sustainable dialysis treatment and a set of measurable quality parameters; and integration of dialysis, transplantation, and comprehensive conservative care as ESKD treatment options within the context of overall health priorities. Intended users of the action plans include clinicians, patients and their families, scientists, industry partners, government decision makers, and advocacy organizations. Implementation of this integrated and comprehensive plan is intended to improve quality and access to care and thereby reduce serious health-related suffering of adults and children affected by ESKD worldwide.


Assuntos
Países em Desenvolvimento , Planejamento em Saúde , Acessibilidade aos Serviços de Saúde , Falência Renal Crônica/terapia , Terapia de Substituição Renal/economia , Cobertura Universal do Seguro de Saúde , Tratamento Conservador , Carga Global da Doença , Saúde Global , Ocupações em Saúde/educação , Política de Saúde , Acessibilidade aos Serviços de Saúde/economia , Acessibilidade aos Serviços de Saúde/ética , Mão de Obra em Saúde , Humanos , Falência Renal Crônica/epidemiologia , Falência Renal Crônica/prevenção & controle , Defesa do Paciente , Terapia de Substituição Renal/efeitos adversos , Terapia de Substituição Renal/ética , Terapia de Substituição Renal/normas , Cobertura Universal do Seguro de Saúde/economia
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