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1.
Plant Biotechnol J ; 22(5): 1051-1066, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38070179

RESUMEN

To increase rice yields and feed billions of people, it is essential to enhance genetic gains. However, the development of new varieties is hindered by longer generation times and seasonal constraints. To address these limitations, a speed breeding facility has been established and a robust speed breeding protocol, SpeedFlower is developed that allows growing 4-5 generations of indica and/or japonica rice in a year. Our findings reveal that a high red-to-blue (2R > 1B) spectrum ratio, followed by green, yellow and far-red (FR) light, along with a 24-h long day (LD) photoperiod for the initial 15 days of the vegetative phase, facilitated early flowering. This is further enhanced by 10-h short day (SD) photoperiod in the later stage and day and night temperatures of 32/30 °C, along with 65% humidity facilitated early flowering ranging from 52 to 60 days at high light intensity (800 µmol m-2 s-1). Additionally, the use of prematurely harvested seeds and gibberellic acid treatment reduced the maturity duration by 50%. Further, SpeedFlower was validated on a diverse subset of 198 rice accessions from 3K RGP panel encompassing all 12 distinct groups of Oryza sativa L. classes. Our results confirmed that using SpeedFlower one generation can be achieved within 58-71 days resulting in 5.1-6.3 generations per year across the 12 sub-groups. This breakthrough enables us to enhance genetic gain, which could feed half of the world's population dependent on rice.


Asunto(s)
Oryza , Humanos , Oryza/genética , Fitomejoramiento , Luz
2.
Anal Chem ; 94(25): 8867-8873, 2022 06 28.
Artículo en Inglés | MEDLINE | ID: mdl-35699939

RESUMEN

Nanomaterial-based biosensors are a promising fit for portable and field-deployable diagnosis sensor devices due to their mass production, miniaturization, and integration capabilities. However, the fabrication of highly stable and reproducible biosensor devices is challenging. In this work, we grow a vertically oriented architecture of zinc oxide nanorods onto the active working area (i.e., the channel between the source and drain) of a field-effect transistor (FET) using a low-temperature hydrothermal method. The glucose oxidase enzyme was immobilized on the zinc oxide nanorod surface by a physical adsorption method to fabricate the electrolyte-gated FET-based glucose biosensor. The electrical properties of the electrolyte-gated FET biosensor were measured with different glucose concentrations. We found a linear increase in current up to 80 mM glucose concentration with high sensitivity (74.78 µA/mMcm2) and a low detection limit (∼0.05 mM). We illustrate a highly reproducible fabrication process of zinc oxide nanorod-based FETs, where vertically grown nanorods with a higher surface-to-volume ratio enhance the enzyme immobilization, provide a microenvironment for longer enzyme activity, and translate to better glucose sensing parameters. Additionally, our electrolyte-gated FET biosensor showed promising application in freshly drawn mouse blood samples. These findings suggest a great opportunity to translate into practical high-performance biosensors for a broad range of analytes.


Asunto(s)
Técnicas Biosensibles , Nanotubos , Óxido de Zinc , Animales , Técnicas Biosensibles/métodos , Electrólitos , Glucosa , Ratones
3.
Molecules ; 27(4)2022 Feb 19.
Artículo en Inglés | MEDLINE | ID: mdl-35209209

RESUMEN

Protective coatings for harsh environments are always welcome, but they must overcome profound challenges, including corrosion and wear resistance. The purpose of this study is to look into the long-term potentiodynamic polarization measurements and dry tribometric behavior of plasma-sprayed amorphous coatings on AISI 1035 mild steel. To investigate the impact of unique active polarization potentials on the electrochemical studies of the iron-based amorphous layer, which compares favorably to AISI 1035 mild steel, the active potential polarization curve and friction coefficient tests were performed. Scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) analyses were used to investigate the coating's corrosion behavior. Their mechanical (Tribometric tests at higher sliding speeds) and chemical properties (electrochemical potentiodynamic polarization investigations) have also been thoroughly investigated. There is enough validation that these protective coatings can be used in hostile environments. The effects of long-term corrosion for 24 and 48 h were thoroughly examined. Tribometric examinations revealed that amorphous layers are highly resistant under dry conditions, as they offered a very low and stable friction coefficient less than 4 µ with micro Vickers hardness 1140 ± 22.14 HV, which is more than twice as compared to mild steel AISI 1035. The corrosion resistance of coatings in 3.5 wt % NaCl solution displays active transition characteristics of activation, passivation, over passivation, and pitting, as shown by the potentiodynamic polarization curves.

4.
Molecules ; 26(24)2021 Dec 11.
Artículo en Inglés | MEDLINE | ID: mdl-34946597

RESUMEN

Cosmetic industries are highly committed to finding natural sources of functional active constituents preferable to safer materials to meet consumers' demands. Marine macroalgae have diversified bioactive constituents and possess potential benefits in beauty care products. Hence, the present study was carried out to characterize the biochemical profile of marine macroalga Chaetomorpha crassa by using different techniques for revealing its cosmetic potentials. In results, the FTIR study characterized the presence of different bioactive functional groups that are responsible for many skin-beneficial compounds whereas six and fifteen different important phycocompounds were found in GCMS analysis of ethanolic and methanolic extracts, respectively. In the saccharide profile of C. crassa, a total of eight different carbohydrate derivatives were determined by the HRLCMS Q-TOF technique, which showed wide varieties of cosmetic interest. In ICP AES analysis, Si was found to be highest whereas Cu was found to be lowest among other elements. A total of twenty-one amino acids were measured by the HRLCMS-QTOF technique, which revealed the highest amount of the amino acid, Aspartic acid (1207.45 nmol/mL) and tyrosine (106.77 nmol/mL) was found to be the lowest in amount among other amino acids. Their cosmetic potentials have been studied based on previous research studies. The incorporation of seaweed-based bioactive components in cosmetics has been extensively growing due to its skin health-promoting effects.


Asunto(s)
Aminoácidos/farmacología , Cosméticos/farmacología , Ácidos Grasos/farmacología , Minerales/farmacología , Polisacáridos/farmacología , Piel/efectos de los fármacos , Aminoácidos/química , Cromatografía Líquida de Alta Presión , Cosméticos/química , Ácidos Grasos/química , Humanos , Minerales/química , Polisacáridos/química , Algas Marinas/química , Espectrometría de Masas en Tándem
5.
Plant Biotechnol J ; 18(11): 2173-2186, 2020 11.
Artículo en Inglés | MEDLINE | ID: mdl-32725933

RESUMEN

Rice is a staple food for half of the world's population. Changing climatic conditions, water and labour scarcity are the major challenges that shall limit future rice production. Dry direct-seeded rice (DDSR) is emerging as an efficient, resources conserving, mechanized, climate smart and economically viable strategy to be adopted as an alternative to puddled transplanted rice (TPR) with the potential to address the problem of labour-water shortages and ensure sustainable rice cultivation. Despite these benefits, several constraints obstruct the adoption of DDSR. In principle, the plant type for DDSR should be different from one for TPR, which could be achieved by developing rice varieties that combine the traits of upland and lowland varieties. In this context, recent advances in precise phenotyping and NGS-based trait mapping led to identification of promising donors and QTLs/genes for DDSR favourable traits to be employed in genomic breeding. This review discusses the important traits influencing DDSR, research studies to clarify the need for breeding DDSR-specific varieties to achieve enhanced grain yield, climate resilience and nutrition demand. We anticipate that in the coming years, genomic breeding for developing DDSR-specific varieties would be a regular practice and might be further strengthened by combining superior haplotypes regulating important DDSR traits by haplotype-based breeding.


Asunto(s)
Oryza , Cruzamiento , Genómica , Oryza/genética , Sitios de Carácter Cuantitativo/genética , Semillas
6.
Toxicol Appl Pharmacol ; 356: 224-234, 2018 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-30138657

RESUMEN

Patulin (PAT), a mycotoxin, is a natural contaminant that is produced by certain species of Penicillium, Aspergillus and Byssochlamys. The major contamination of PAT is in apple and apple based products. PAT is known to cause glutathione depletion, oxidative DNA damage and cell proliferation. Recently, in vitro studies have indicated that PAT can also increase the intestinal epithelial permeability, modulate tight junctions and decrease transepithelial electrical resistance. Nonetheless, no previous study has evaluated the mechanisms responsible for PAT-induced intestinal toxicity or its relevance to the in vivo situation. Here, Wistar rats were orally treated with 100 µg/kg body weight (b.wt.) of PAT, either alone or along with 100 mg/kg b. wt. of celecoxib for 3 days. We found that PAT exposure led to significantly higher levels of PGE2 in serum and intestinal tissue and high expression of COX-2 and Ki-67 compared to controls. Interestingly, our results showed that celecoxib treatment could decrease the PAT-induced PGE2 and reduce the PAT-induced intestinal damage. To study the mechanistic aspect, normal rat intestinal epithelial cells (IEC-6) were treated with non-toxic concentrations (100 nM, 250 nM and 500 nM) of PAT for 6 h. It was observed that PAT exposure caused enhanced proliferation, higher expression of COX-2, and EP2 and EP4 receptors, along with increased PGE2 secretion. Additionally, PAT exposure caused enhanced Akt expression, which in turn inhibits GSK-3ß and stabilizes ß-catenin. Overall, our study suggests that the COX-2/EP2-EP4/ß-catenin signaling cascades are involved in the regulation of PAT-induced intestinal cell proliferation and inflammation.


Asunto(s)
Proliferación Celular/efectos de los fármacos , Ciclooxigenasa 2/efectos de los fármacos , Enteritis/tratamiento farmacológico , Intestinos/citología , Intestinos/efectos de los fármacos , Patulina/farmacología , Subtipo EP2 de Receptores de Prostaglandina E/efectos de los fármacos , Transducción de Señal/genética , beta Catenina/efectos de los fármacos , Animales , Celecoxib/farmacología , Inhibidores de la Ciclooxigenasa 2/farmacología , Dinoprostona/sangre , Enteritis/fisiopatología , Células Epiteliales/efectos de los fármacos , Glicoproteínas , Masculino , Proteína Oncogénica v-akt/biosíntesis , Proteínas de Plantas , Ratas , Ratas Wistar , Subtipo EP4 de Receptores de Prostaglandina E/efectos de los fármacos , Transducción de Señal/fisiología
7.
Mol Ther ; 25(6): 1342-1352, 2017 06 07.
Artículo en Inglés | MEDLINE | ID: mdl-28366765

RESUMEN

Topical delivery of nucleic acids to skin has huge prospects in developing therapeutic interventions for cutaneous disorders. In spite of initial success, clinical translation is vastly impeded by the constraints of bioavailability as well as stability in metabolically active environment of skin. Various physical and chemical methods used to overcome these limitations involve invasive procedures or compounds that compromise skin integrity. Hence, there is an increasing demand for developing safe skin penetration enhancers for efficient nucleic acid delivery to skin. Here, we demonstrate that pretreatment of skin with silicone oil can increase the transfection efficiency of non-covalently associated peptide-plasmid DNA nanocomplexes in skin ex vivo and in vivo. The method does not compromise skin integrity, as indicated by microscopic evaluation of cellular differentiation, tissue architecture, enzyme activity assessment, dye penetration tests using Franz assay, and cytotoxicity and immunogenicity analyses. Stability of nanocomplexes is not hampered on pretreatment, thereby avoiding nuclease-mediated degradation. The mechanistic insights through Fourier transform infrared (FTIR) spectroscopy reveal some alterations in the skin hydration status owing to possible occlusion effects of the enhancer. Overall, we describe a topical, non-invasive, efficient, and safe method that can be used to increase the penetration and delivery of plasmid DNA to skin for possible therapeutic applications.


Asunto(s)
Técnicas de Transferencia de Gen , Ácidos Nucleicos , Aceites de Silicona , Piel/metabolismo , Administración Tópica , Animales , Línea Celular , Supervivencia Celular , Péptidos de Penetración Celular/metabolismo , Citocinas/metabolismo , Citometría de Flujo , Expresión Génica , Genes Reporteros , Humanos , Ratones , Nanopartículas , Ácidos Nucleicos/administración & dosificación , Ácidos Nucleicos/química , Ácidos Nucleicos/genética , Permeabilidad , Plásmidos/administración & dosificación , Plásmidos/química , Plásmidos/genética , Aceites de Silicona/química , Espectroscopía Infrarroja por Transformada de Fourier , Transfección
8.
Photodermatol Photoimmunol Photomed ; 34(1): 82-90, 2018 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-28857273

RESUMEN

BACKGROUND: Ultraviolet B (UVB) radiation is the major contributor to skin inflammation which leads to the development of skin cancer. Hence, in this study, we studied the effect of Nexrutine (NX) on UVB-induced cutaneous inflammation and its mediators. METHODS: Ultraviolet absorption spectra of NX were measured by spectrophotometer. To conduct the photoprotective studies, SKH-1 hairless mice were topically treated with NX, 30 minutes before to the UVB (180 mJ/cm2 ) exposure. Twenty hours of post-UVB irradiation, mouse skin was used for edema measurements, H & E staining, myeloperoxidase (MPO) activity, and estimation of plasma cytokines. In addition, expression levels of inflammatory cytokines, cyclooxygenase-2 (COX-2), and inducible nitric oxide synthase (iNOS) were also determined by Western blot analysis. RESULTS: Nexrutine displayed absorbance over the UVB spectrum. NX significantly decreased the UVB-induced epidermal edema, skin thickness, leukocyte infiltration, number of the sunburn, and TUNEL-positive cells. NX treatment also decreased the number of mast cells, MPO activity, expression of pro-inflammatory cytokines, and inflammation mediator protein in mouse skin. CONCLUSION: These results provide evidences that NX inhibits the UVB-induced cutaneous inflammatory responses in SKH-1 mouse skin.


Asunto(s)
Edema/prevención & control , Extractos Vegetales/uso terapéutico , Radiodermatitis/etiología , Radiodermatitis/prevención & control , Quemadura Solar/prevención & control , Rayos Ultravioleta/efectos adversos , Absorción de Radiación , Administración Cutánea , Animales , Ciclooxigenasa 2/metabolismo , Citocinas/metabolismo , Fragmentación del ADN/efectos de los fármacos , Fragmentación del ADN/efectos de la radiación , Edema/etiología , Femenino , Ratones , Ratones Pelados , Óxido Nítrico Sintasa de Tipo II/metabolismo , Peroxidasa/metabolismo , Extractos Vegetales/administración & dosificación , Radiodermatitis/enzimología , Radiodermatitis/patología , Espectrofotometría , Quemadura Solar/etiología
9.
Chem Res Toxicol ; 30(2): 625-634, 2017 02 20.
Artículo en Inglés | MEDLINE | ID: mdl-28029781

RESUMEN

Benzanthrone (BA), an oxidized polycyclic aromatic hydrocarbon (PAH), has been found to be a potential health threat to occupational workers involved in dye manufacturing factories. It has been observed that occupational workers become exposed to BA either during manufacturing, pulverization, or storage and developed various kinds of skin diseases like contact dermatitis, itching, erythema, roughness, and foremost, hyperpigmentation. It has been shown that some environmental organic pollutants (POPs) like dioxins, furans, and polychlorinated biphenyls (PCBs) may act as ligands for the aryl hydrocarbon receptor (AhR) and regulate hyperpigmentation. Here, we hypothesized that BA may also act as a ligand for AhR and possibly regulate the melanogenic pathway to induced hyperpigmentation. Our computation results indicate that BA has a high binding affinity toward AhR for the initiation of melanogenic signaling. Following the in silico predictions, we used primary mouse melanocytes (PMMs) and confirmed that exposure to BA (5, 10, and 25 µM) resulted in an increase in AhR expression, tyrosinase activity, and melanin synthesis. Moreover, to study the physiological relevance of these findings, C57BL/6 mice were topically exposed to BA, and enhanced pigmentation and melanin synthesis were observed. Furthermore, the study was extended to assess the mechanistic aspects involved in BA-induced hyperpigmentation in PMMs as well as in mouse skin. Our results suggest that BA exposure initiates AhR signaling and increases tyrosinase enzyme activity and melanin synthesis. Moreover, the genes that regulate the melanin synthesis, such as TRP-1, TRP-2 and the transcription factor MITF, were also found to be increased. Thus, altogether, we suggest that BA-AhR interactions are critical for BA-induced hyperpigmentation.


Asunto(s)
Benzo(a)Antracenos/toxicidad , Melaninas/metabolismo , Trastornos de la Pigmentación/inducido químicamente , Receptores de Hidrocarburo de Aril/metabolismo , Transducción de Señal , Animales , Células Cultivadas , Ratones , Ratones Endogámicos C57BL , Simulación del Acoplamiento Molecular
10.
Mol Carcinog ; 55(8): 1262-74, 2016 08.
Artículo en Inglés | MEDLINE | ID: mdl-26259065

RESUMEN

Colon cancer is the third most common cause of death in the United States. Therefore, new preventive strategies are warranted for preventing colon cancer. Nexrutine (NX), an herbal extract from Phellodendron amurense, has been shown to have anti-inflammatory, anti-microbial and anti-cancer activity for various tissue specific cancers, but its chemopreventive efficacy has not been evaluated against colon cancer. Here, we explored the mechanism of chemopreventive/chemotherapeutic efficacy of NX against colon cancer. We found that dietary exposure of NX significantly reduced the number of azoxymethane (AOM)-induced aberrant crypt foci (ACF) in rats. In addition, significant inhibition in AOM-induced cell proliferation and reduced expression of the inflammatory markers COX-2, iNOS as well as the proliferative markers PCNA and cyclin D1 were also seen. Moreover, NX exposure significantly enhanced apoptosis in the colon of AOM treated rats. Furthermore, in in vitro studies, NX (2.5, 5, 10 µg/ml, 48 h) decreased cell survival and colony formation while inducing G0/G1 cell cycle arrest and apoptosis in colon adenocarcinoma cells COLO205 and HCT-15. However, NX had minimal cytotoxic effect on IEC-6 normal rat intestinal cells, suggesting its high therapeutic index. NX treatment also modulates the level of Bax and Bcl-2 proteins along with cytochrome c release, cleavage and enhanced expression of poly (adenosine diphosphate-ribose) polymerase as well as the catalytic activity of caspase 3 and caspase 9 in both COLO205 and HCT-15 cells. Based on these in vivo and in vitro findings, we suggest that NX could be useful candidate agent for colon cancer chemoprevention and treatment. © 2015 Wiley Periodicals, Inc.


Asunto(s)
Focos de Criptas Aberrantes/dietoterapia , Azoximetano/toxicidad , Biomarcadores de Tumor/metabolismo , Neoplasias del Colon/dietoterapia , Extractos Vegetales/administración & dosificación , Focos de Criptas Aberrantes/inducido químicamente , Focos de Criptas Aberrantes/metabolismo , Animales , Apoptosis , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Supervivencia Celular/efectos de los fármacos , Neoplasias del Colon/inducido químicamente , Neoplasias del Colon/metabolismo , Ciclina D1/metabolismo , Ciclooxigenasa 2/metabolismo , Regulación Neoplásica de la Expresión Génica , Humanos , Masculino , Óxido Nítrico Sintasa de Tipo II/metabolismo , Extractos Vegetales/farmacología , Ratas , Ensayos Antitumor por Modelo de Xenoinjerto
11.
Mol Carcinog ; 53(12): 988-98, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-23813870

RESUMEN

Patulin (PAT), a present day major contaminant of commercial apple and apple products is reported to be carcinogenic, embryotoxic, and immunotoxic. While oral and inhalation are considered to be the most prevalent routes of exposure to this toxin, exposure through skin is now being extensively investigated. Our previous study showed that short-term dermal exposure to PAT resulted in toxicological injury to the skin, while long-term exposure induced skin tumorigenesis. In this study, we explore the mechanism involve in proliferation of mouse keratinocytes by PAT. Our study revealed that PAT rapidly induces phosphorylation of EGFR, activation of the Ras/MAPKs, and Akt pathways. This in-turn leads to the activation of NF-κB/AP-1 transcription factors which then binds to the promoter region of the cell growth regulatory genes Cyclin D1 and COX-2 inducing their expression leading ultimately to PMKs proliferation. Inhibition of EGFR or the Ras/MAPKs, PI3/Akt pathways with different pharmacological inhibitors or knockdown of NF-κB, c-jun, c-fos, Cyclin D1, and COX-2 with siRNA inhibited PAT-induced PMKs proliferation.


Asunto(s)
Proliferación Celular/genética , Ciclina D1/genética , Ciclooxigenasa 2/genética , Receptores ErbB/genética , Queratinocitos/metabolismo , Proteínas Quinasas Activadas por Mitógenos/genética , Proteínas Proto-Oncogénicas c-akt/genética , Animales , Proliferación Celular/efectos de los fármacos , Células Cultivadas , Queratinocitos/efectos de los fármacos , Ratones , FN-kappa B/genética , Patulina/efectos adversos , Fosfatidilinositol 3-Quinasas/genética , Fosforilación/efectos de los fármacos , Fosforilación/genética , Regiones Promotoras Genéticas/efectos de los fármacos , Regiones Promotoras Genéticas/genética , Proteínas Proto-Oncogénicas c-fos/genética , Proteínas Proto-Oncogénicas c-jun/genética , Transducción de Señal/genética , Factor de Transcripción AP-1/genética , Proteínas ras/genética
12.
PLoS One ; 19(5): e0303101, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38739642

RESUMEN

This research study aims to understand the application of Artificial Neural Networks (ANNs) to forecast the Self-Compacting Recycled Coarse Aggregate Concrete (SCRCAC) compressive strength. From different literature, 602 available data sets from SCRCAC mix designs are collected, and the data are rearranged, reconstructed, trained and tested for the ANN model development. The models were established using seven input variables: the mass of cementitious content, water, natural coarse aggregate content, natural fine aggregate content, recycled coarse aggregate content, chemical admixture and mineral admixture used in the SCRCAC mix designs. Two normalization techniques are used for data normalization to visualize the data distribution. For each normalization technique, three transfer functions are used for modelling. In total, six different types of models were run in MATLAB and used to estimate the 28th day SCRCAC compressive strength. Normalization technique 2 performs better than 1 and TANSING is the best transfer function. The best k-fold cross-validation fold is k = 7. The coefficient of determination for predicted and actual compressive strength is 0.78 for training and 0.86 for testing. The impact of the number of neurons and layers on the model was performed. Inputs from standards are used to forecast the 28th day compressive strength. Apart from ANN, Machine Learning (ML) techniques like random forest, extra trees, extreme boosting and light gradient boosting techniques are adopted to predict the 28th day compressive strength of SCRCAC. Compared to ML, ANN prediction shows better results in terms of sensitive analysis. The study also extended to determine 28th day compressive strength from experimental work and compared it with 28th day compressive strength from ANN best model. Standard and ANN mix designs have similar fresh and hardened properties. The average compressive strength from ANN model and experimental results are 39.067 and 38.36 MPa, respectively with correlation coefficient is 1. It appears that ANN can validly predict the compressive strength of concrete.


Asunto(s)
Fuerza Compresiva , Materiales de Construcción , Aprendizaje Automático , Redes Neurales de la Computación , Materiales de Construcción/análisis , Reciclaje
13.
Nanomaterials (Basel) ; 14(8)2024 Apr 18.
Artículo en Inglés | MEDLINE | ID: mdl-38668200

RESUMEN

Nitrite monitoring serves as a fundamental practice for protecting public health, preserving environmental quality, ensuring food safety, maintaining industrial safety standards, and optimizing agricultural practices. Although many nitrite sensing methods have been recently developed, the quantification of nitrite remains challenging due to sensitivity and selectivity limitations. In this context, we present the fabrication of enzymeless iron oxide nanoparticle-modified zinc oxide nanorod (α-Fe2O3-ZnO NR) hybrid nanostructure-based nitrite sensor fabrication. The α-Fe2O3-ZnO NR hybrid nanostructure was synthesized using a two-step hydrothermal method and characterized in detail utilizing x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). These analyses confirm the successful synthesis of an α-Fe2O3-ZnO NR hybrid nanostructure, highlighting its morphology, purity, crystallinity, and elemental constituents. The α-Fe2O3-ZnO NR hybrid nanostructure was used to modify the SPCE (screen-printed carbon electrode) for enzymeless nitrite sensor fabrication. The voltammetric methods (i.e., cyclic voltammetry (CV) and differential pulse voltammetry (DPV)) were employed to explore the electrochemical characteristics of α-Fe2O3-ZnO NR/SPCE sensors for nitrite. Upon examination of the sensor's electrochemical behavior across a range of nitrite concentrations (0 to 500 µM), it is evident that the α-Fe2O3-ZnO NR hybrid nanostructure shows an increased response with increasing nitrite concentration. The sensor demonstrates a linear response to nitrite concentrations up to 400 µM, a remarkable sensitivity of 18.10 µA µM-1 cm-2, and a notably low detection threshold of 0.16 µM. Furthermore, its exceptional selectivity, stability, and reproducibility make it an ideal tool for accurately measuring nitrite levels in serum, yielding reliable outcomes. This advancement heralds a significant step forward in the field of environmental monitoring, offering a potent solution for the precise assessment of nitrite pollution.

14.
Front Plant Sci ; 15: 1272326, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38481398

RESUMEN

Rice blast and bacterial leaf blight, are major disease, significantly threatens rice yield in all rice growing regions under favorable conditions and identification of resistance genes and their superior haplotypes is a potential strategy for effectively managing and controlling this devastating disease. In this study, we conducted a genome-wide association study (GWAS) using a diverse set of 147 rice accessions for blast and bacterial blight diseases in replications. Results revealed 23 (9 for blast and 14 for BLB) significant marker-trait associations (MTAs) that corresponded to 107 and 210 candidate genes for blast and BLB, respectively. The haplo-pheno analysis of the candidate genes led to the identification of eight superior haplotypes for blast, with an average SES score ranging from 0.00 to 1.33, and five superior haplotypes for BLB, with scores ranging from 1.52cm to 4.86cm superior haplotypes. Among these, superior haplotypes LOC_OS12G39700-H4 and LOC_Os06g30440-H33 were identified with the lowest average blast scores of 0.00-0.67, and superior haplotype LOC_Os02g12660-H39 exhibited the lowest average lesion length (1.88 - 2.06cm) for BLB. A total of ten accessions for blast and eight accessions for BLB were identified carrying superior haplotypes were identified. These haplotypes belong to aus and indx subpopulations of five countries (Bangladesh, Brazil, India, Myanmar, and Pakistan). For BLB resistance, eight accessions from six countries (Bangladesh, China, India, Myanmar, Pakistan, and Sri Lanka) and four subpopulations (aus, ind1A, ind2, and ind3) were identified carrying superior haplotypes. Interestingly, four candidate genes, LOC_Os06g21040, LOC_Os04g23960, LOC_Os12g39700, and LOC_Os01g24640 encoding transposon and retrotransposon proteins were among those with superior haplotypes known to play a crucial role in plant defense responses. These identified superior haplotypes have the potential to be combined into a single genetic background through haplotype-based breeding for a broader resistance spectrum against blast and bacterial blight diseases.

15.
Carcinogenesis ; 34(3): 647-57, 2013 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-23172667

RESUMEN

Our prior studies have indicated that ochratoxin A (OTA), a mycotoxin, has skin tumor initiating activity. In the present investigation, skin tumor promoting activity of OTA and the mechanism/(s) involved therein was undertaken. A single topical application of OTA (100 nmol/mouse) caused significant enhancement in short-term markers of skin tumor promotion such as ornithine decarboxylase activity, DNA synthesis, hyperplasia as well as expression of cyclin-D1 and COX-2 in mouse skin. In a two-stage mouse skin tumorigenesis protocol, twice-weekly exposure of OTA (50 nmol/mouse) to 7,12-dimethylbenz[α]anthracene (120 nmol/mouse) initiated mice skin for 24 weeks leads to tumor formation. Further, exposure of primary murine keratinocytes (PMKs) with non-cytotoxic dose of OTA (5.0 µM) caused (i) significant enhancement of DNA synthesis, (ii) enhanced phosphorylation and subsequent activation of epidermal growth factor receptor (EGFR) and its downstream signaling pathways viz Akt, ERK1/2, p38 and JNK mitogen-activated protein kinases (MAPKs), (iii) overexpression of c-jun, c-fos, cyclin-D1 and COX-2 and (iv) increased binding of nuclear factor-kappaB (NF-κB) and AP-1 transcription factors to the promoter region of cyclin-D1 and COX-2 genes. It was also observed that knocking down the messenger RNA expression of NF-κB, c-jun, c-fos, cyclin-D1 and COX-2 results in significant inhibition in OTA-induced PMKs proliferation. These results suggest that OTA has cell proliferative and tumor-promoting potential in mouse skin, which involves EGFR-mediated MAPKs and Akt pathways along with NF-κB and AP-1 transcription factors and that cyclin-D1 and COX-2 are the target genes responsible for tumor-promoting activity of OTA.


Asunto(s)
Carcinógenos/farmacología , Proliferación Celular/efectos de los fármacos , Ciclina D1/genética , Ciclooxigenasa 2/genética , FN-kappa B/metabolismo , Ocratoxinas/farmacología , Neoplasias Cutáneas/metabolismo , Factor de Transcripción AP-1/metabolismo , 9,10-Dimetil-1,2-benzantraceno , Animales , Supervivencia Celular/efectos de los fármacos , Células Cultivadas , Ciclina D1/metabolismo , Ciclooxigenasa 2/metabolismo , Activación Enzimática , Epidermis/efectos de los fármacos , Epidermis/enzimología , Epidermis/patología , Receptores ErbB/metabolismo , Femenino , Técnicas de Silenciamiento del Gen , Hiperplasia/inducido químicamente , Hiperplasia/metabolismo , Queratinocitos/efectos de los fármacos , Queratinocitos/metabolismo , Queratinocitos/fisiología , Ratones , Proteínas Quinasas Activadas por Mitógenos/metabolismo , FN-kappa B/genética , FN-kappa B/fisiología , Ornitina Descarboxilasa/metabolismo , Fosforilación , Cultivo Primario de Células , Regiones Promotoras Genéticas , Unión Proteica , Procesamiento Proteico-Postraduccional , Proteínas Proto-Oncogénicas c-akt/metabolismo , ARN Interferente Pequeño/genética , Neoplasias Cutáneas/inducido químicamente , Factor de Transcripción AP-1/fisiología , Activación Transcripcional/efectos de los fármacos
16.
Nutr Cancer ; 65 Suppl 1: 78-87, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-23682786

RESUMEN

Since bioantioxidants in plasma of Epidemic Dropsy patients [a condition caused by consumption of adulterated mustard oil with argemone oil (AO)] were found to be significantly decreased, the beneficial effect of N-acetyl cysteine (NAC) and α-tocopherol (TOCO) against AO- or sanguinarine (SANG)-induced tumorigenicity was undertaken in mice. Topical application of TOCO and NAC either alone or in combination showed significant protection against AO/TPA- and SANG/TPA-induced skin tumorigenicity. Histopathological findings suggest that papillomatous growth in AO/TPA- and SANG/TPA-treated animals were substantially protected following topical application of TOCO or NAC. Further, treatment of TOCO and NAC either alone or in combination to AO/TPA- or SANG/TPA-induced mice significantly decreased lipid peroxidation, along with significant revival in glutathione (GSH) content and activities of tyrosinase, histidase, catalase, SOD, GSH peroxidase, and GSH reductase in skin. In vitro studies showed that TOCO and/or NAC significantly decreased the AO and SANG induced cell proliferation and activation of ERK, p38, JNK MAPKs and NF-κB signaling in HaCaT cells. In summary, TOCO and NAC may be useful in preventing the tumorigenic response of AO and SANG probably by acting as scavenger of free radicals and inhibiting MAPKs and NF-κB signaling.


Asunto(s)
Acetilcisteína/farmacología , Carcinogénesis/efectos de los fármacos , Planta de la Mostaza/efectos adversos , Aceites de Plantas/efectos adversos , alfa-Tocoferol/farmacología , Animales , Antioxidantes/farmacología , Benzofenantridinas/efectos adversos , Carcinogénesis/inducido químicamente , Proliferación Celular/efectos de los fármacos , Células Cultivadas , Femenino , Glutatión/análisis , Glutatión/metabolismo , Humanos , Isoquinolinas/efectos adversos , Peroxidación de Lípido/efectos de los fármacos , Sistema de Señalización de MAP Quinasas , Ratones , FN-kappa B/genética , FN-kappa B/metabolismo , Piel/efectos de los fármacos , Piel/patología , Proteínas Quinasas p38 Activadas por Mitógenos/genética , Proteínas Quinasas p38 Activadas por Mitógenos/metabolismo
17.
ACS Omega ; 8(42): 38950-38960, 2023 Oct 24.
Artículo en Inglés | MEDLINE | ID: mdl-37901507

RESUMEN

Since soft computing has gained a lot of attention in hydrological studies, this study focuses on predicting aeration efficiency (E20) using circular plunging jets employing soft computing techniques such as reduced error pruning tree (REPTree), random forest (RF), and M5P. The study undertaken required the development and validation of models, which were achieved using 63 experimental data values with input variables, such as angle of inclination of tilt channel (α), number of plunging jets (JN), discharge of each jet (Q), hydraulic radius of each jet (HR), and Froude number (Fr. No), to evaluate the aeration efficiency (E20), which served as the output variable. To evaluate the effectiveness of the developed models, three different statistical indices were used such as the coefficient of correlation (CC), root-mean-square error (RMSE), and mean absolute error (MAE), and it was found that all of the applied techniques possessed good forecasting ability since their correlation coefficient values were greater than 0.8. Upon testing, it was discovered that the M5P model outperformed other soft computing-based models in its ability to predict E20, as demonstrated by its correlation coefficient value of 0.9564 and notably low values of MAE (0.0143) and RMSE (0.0193).

18.
ACS Omega ; 8(20): 18000-18008, 2023 May 23.
Artículo en Inglés | MEDLINE | ID: mdl-37251143

RESUMEN

In this research work, the mechanical properties of high-strength self-compacting concrete (HSSCC) were studied. Three mixes were selected, having compressive strengths of more than 70, 80, and 90 MPa, respectively. For these three mixes, the stress-strain characteristics were studied by casting cylinders. It was observed during the testing that the binder content and water-to-binder ratio influence the strength of HSSCC, and slow changes in stress-strain curves were seen as the strength increased. The use of HSSCC results in reduced bond cracking, leading to a more linear and steeper stress-strain curve in the ascending branches as the strength of the concrete increases. Elastic properties such as modulus of elasticity and Poisson's ratio of HSSCC were calculated using experimental data. In HSSCC, since the aggregate content is lower and the size of the aggregates is smaller, it will have a lower modulus of elasticity compared to normal vibrating concrete (NVC). Thus, an equation is proposed from the experimental results for predicting the modulus of elasticity of HSSCC. The results suggest that the proposed equation for predicting the elastic modulus of HSSCC for strengths ranging from 70 to 90 MPa is valid. It was also observed that the Poisson's ratio values for all three mixes of HSSCC were found to be lower than the typical value for NVC, indicating a higher degree of stiffness.

19.
ACS Omega ; 8(20): 17992-17999, 2023 May 23.
Artículo en Inglés | MEDLINE | ID: mdl-37251169

RESUMEN

High-performance concrete (HPC) is increasingly used in construction due to its superior strength and durability. However, current stress block parameters used for designing normal-strength concrete cannot be safely applied to HPC. To address this issue, new stress block parameters have been proposed through experimental works, which are used for designing HPC members. In this study, the behavior of HPC was investigated using these stress block parameters. Two-span beams made of HPC were tested under five-point bending, and an idealized stress block curve was derived from the experimental stress-strain curve for grades 60, 80, and 100 MPa. Based on the stress block curve, equations for the ultimate moment of resistance, depth of the neutral axis, limiting moment of resistance, and maximum depth of the neutral axis were proposed. An idealized load-deformation curve was also developed, which identified four significant events: first cracking, yielding of reinforced steel, crushing of concrete with spalling of cover, and ultimate failure. The predicted values were found to be in good agreement with the experimental values, and the average location of the first crack was identified to be 0.270 L, measured from the central support on either side of the span. These findings provide important insights for the design of HPC structures, contributing to the development of more resilient and durable infrastructure.

20.
Chemosphere ; 318: 137945, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-36702406

RESUMEN

The pinnacle of all the efforts of nutrient removal is practically put-down the moment biological cells are lysed, hydrolyzed or digested causing subsequent reappearance of assimilated nitrogen and phosphorus in any biological process. While sludge reduction requires high SRT, the enhanced phosphorus assimilative uptake demands low SRT. A novel reactor configuration for enhanced sludge and phosphorus removal was put to test by incorporating a side stream anaerobic reactor to an Anaerobic-Anoxic-Aerobic (A2O) SBR with a pre-anoxic chamber and an influent receiving inlet anaerobic reactor. The reactor was operated at the average and lowest range of prevailing carbon/phosphorus (C/P) ratio of 50 and 15 in the sewage. The phosphorus enrichment was 0.0469-0.135 mgTP/mgVSS resulting in 1.76-5.05-fold increase from cellular content by virtue of maintaining sludge recycle from SBR aeration tank to side stream anaerobic reactor from 3.78 to 9.78 (average 4.4-8.2) gVSS/gVSS present in the reactor. However, the sludge was also reduced from 3% to 51% on an average basis during the same recirculation regime. This novel configuration consists of an inlet anaerobic reactor, one pre-anoxic chamber and one intermittent oxic anoxic reaction SBR and a side stream anaerobic reactor. The first anaerobic reactor at inlet followed by pre-anoxic chamber was provided for increased ortho-p released and nitrification respectively and a side stream anaerobic reactor for sludge reduction through sludge fasting mechanism. The EBPR and lesser sludge growth were two conflicting parameters reconciled to the extent that if sludge recycled up to 6.41 gVSS/gVSS the sludge growth would be reduced by 25% and phosphorus enrichment could be attained up to 3.46 times the stoichiometric value. Any further recirculation would reduce the sludge further but at the expense of enhanced phosphorus uptake as released phosphorus from side stream anaerobic reactor also recycled back to main SBR causing looping and at more than 6.41gVSSrecycled/gVSS it nullified the enhanced effect.


Asunto(s)
Reactores Biológicos , Aguas del Alcantarillado , Nitrificación , Fósforo , Nitrógeno , Eliminación de Residuos Líquidos
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