Literatura académica sobre el tema "Deteccio tq"

The sodium triple-quantum (TQ) magnetic resonance (MR) signal created by interactions of sodium ions with macromolecules has been demonstrated to be a valuable biomarker for cell viability. The aim of this study was to monitor a cellular response using the sodium TQ signal during inhibition of Na/K-ATPase in living cancer cells (HepG2). The cells were dynamically investigated after exposure to 1 mM ouabain or K+-free medium for 60 min using an MR-compatible bioreactor system. An improved TQ time proportional phase incrementation (TQTPPI) pulse sequence with almost four times TQ signal-to-noise ratio (SNR) gain allowed for conducting experiments with 12–14 × 106 cells using a 9.4 T MR scanner. During cell intervention experiments, the sodium TQ signal increased to 138.9 ± 4.1% and 183.4 ± 8.9% for 1 mM ouabain (n = 3) and K+-free medium (n = 3), respectively. During reperfusion with normal medium, the sodium TQ signal further increased to 169.2 ± 5.3% for the ouabain experiment, while it recovered to 128.5 ± 6.8% for the K+-free experiment. These sodium TQ signal increases agree with an influx of sodium ions during Na/K-ATPase inhibition and hence a reduced cell viability. The improved TQ signal detection combined with this MR-compatible bioreactor system provides a capability to investigate the cellular response of a variety of cells using the sodium TQ MR signal.

e14644 Background: NSCLC is the most common cause of cancer death worldwide. We performed in vitro testing of Thymoquinone (TQ), a derivative of black caraway seed against NSCLC cell line NCI-H460 Methods: Cells were grown in RPMI and were plated at a density of 5,000 cells per well in a 96 well plate and cell growth determined in the presence of 80 and 100μM of TQ dissolved in DMSO with appropriate solvent only as control. Cell proliferation was determined at 24, 48 and 72 hrs intervals using 3-(4,5-dimethyltiazol 2-yl)-2,5-diphenyltetraolium bromide (MTT) assay. Factorial analyses of variance (ANOVA) were used to determine the effect of TQ and control with the time. Student-Newman-Keuls test was used to determine statistical significance with P value <0.05 considered significant. Apoptosis was detected using Annexin V-FITC Aptosis Detection Kit analyzing the effects of TQ at 24 hrs after treatment by flow cytometry. The immunomodulatory effects of TQ were tested using RayBio Human Cytokine Antibody Array C series 200. NCI-H460 cells (50,000 cells per well in duplicate 6 well plates) were grown in serum free RPMI media. 24 hrs after treatment with TQ or DMSO media was collected and analyzed for expression of various cytokines. Results: The MTT assay showed that TQ at 80 and 100 μM significantly inhibited cell growth as compared to control and at 24 hrs for example, 100 μM TQ inhibited cell growth by 78%. Apoptosis occurred rapidly after treatment with TQ with 73.5% of cells being positive for expression of Annexin-V as detected by flow cytometry after 24 hrs of exposure to TQ as compared to 2.6% of controls. The cytokine array revealed that TQ significantly decreased expression of ENA-78(Epithelial neutrophil activating peptide), and GRO (Growth related oncogene).ENA-78 is correlated with vascularity and tumor growth in NSCLC tumor, whereas GRO is associated with neoangiogenesis. Conclusions: TQ is shown to be a powerful anti-proliferative, pro-apoptotic and anti- angiogenic agent in a NSCLC cell line. No significant financial relationships to disclose.

AbstractThe aim of this study was to investigate the stability of three major antioxidants of Nigella sativa: thymoquinone (TQ), carvacrol (CR) and thymol (THY), under different stress conditions using HPLC and LC-MS/MS. Forced degradation for each compound was performed under different conditions, including oxidation, hydrolysis, photolysis and thermal decomposition. The results showed that both CR and THY were stable under the studied conditions, whereas TQ was not affected by acidic, basic and oxidative forced conditions but the effect of light and heat was significant. The degradation products of TQ were further investigated and characterized by LC-MS/MS. HPLC-UV method has been fully validated in terms of linearity and range, the limit of detection and quantitation, precision, selectivity, accuracy and robustness. The method was successfully applied to quantitative analysis of the principal antioxidants of Nigella sativa TQ, CR and THY in different phytopharmaceuticals.

An antimalarial drug, tafenoquine (TQ), behaves as a fluorescent receptor for ratiometric detection of hypochlorite (OCl⁻), facilitating rapid, selective, and sensitive detection or imaging of OCl⁻in solution and living cells.

Abstract A new, simple, sensitive, rapid, and accurate isocratic RP-HPLC method was developed and validated for simultaneous analysis of the principal antioxidants of Nigella sativa, i.e., thymoquinone (TQ), carvacrol (CR), and its isomer thymol (THY), in different phytopharmaceuticals. The mobile phase was water–methanol (40 + 60, v/v) at a flow rate of 1.5 mL/min. Quantification was achieved with UV detection at 254 nm, based on peak area. The method was validated for linearity, accuracy, precision, selectivity, and robustness. The proposed method is stability-indicating for determination of TQ in the presence of its degradants. The LOD and LOQ (μg/mL) were, respectively, 0.006 and 0.021 for TQ, 0.002 and 0.006 for CR, and 0.027 and 0.090 for THY. The mean recoveries measured at three concentrations were higher than 99%, with RSD &lt;2%. This analytical method is suitable for quality control of the marker substances in this widely used natural protective and curative remedy.

Analysis of the genetic basis of yield heterosis in rice was conducted by quantitative trait locus mapping using a set of 204 recombinant inbred lines (RILs), its testcross population, and mid-parent heterosis dataset (HMP). A total of 39 QTLs for six yield traits were detected, of which three were detected in all the datasets, ten were common to the RIL and testcross populations, six were common to the testcross and HMP, and 17, 2, and 1 were detected for RILs, testcrosses, and HMP, respectively. When a QTL was detected in both the RIL and testcross populations, the difference between TQ and IR24 and that between Zh9A/TQ and Zh9A/IR24 were always in the same direction, providing the potential to increase the yield of hybrids by increasing the yield of parental lines. Genetic action mode of the 39 QTLs was inferred by comparing their performances in RILs, testcrosses, and HMP. The genetic modes were additive for 17 QTLs, dominance for 12 QTLs, and overdominance for 10 QTLs. These results suggest that dominance and overdominance are the most important contributor to yield heterosis in rice, in which the accumulative effects of yield components play an important role.

An accurate and stability indicating high-performance thin layer chromatographic method (HPTLC) was developed and validated for the quantification of thymoquinone (TQ) as per the ICH guidelines. The analysis was carried out on the aluminum plate using n-hexane: ethyl acetate: methanol (7:2:1 v/v/v) as the mobile phase and the densitometric determination was carried out by TLC scanner (CAMAG) at 254 nm. The developed method was validated for different parameters like linearity, precision, recovery, robustness, and stressed stability study. The developed analytical method was found to be linear in the concentration range of 75-500 ng band-1 with regression value closer to unity (r2 = 0.997). The developed system was found to give compact spots for thymoquinone (Rf 0.77) with the limit of detection and limit of quantification (18 and 54 ng band-1) respectively. Further, the study showed accuracy, precision and repeatability were all within the required limits. The stress degradation study of TQ showed well separated degraded peak from the pure thymoquinone. The mean recoveries measured at three concentrations were more than 95% with RSD ≤ 3%. The method has been successfully applied in the analysis and routine quality control of herbal material and formulations containing TQ.Taleuzzaman et al., International Current Pharmaceutical Journal, September 2017, 6(10): 53-60http://www.icpjonline.com/documents/Vol6Issue10/01.pdf

Abstract Assurance GDSTM for Salmonella Tq has been validated according to the AOAC INTERNATIONAL Methods Committee Guidelines for Validation of Microbiological Methods for Food and Environmental Surfaces for the detection of selected foods and environmental surfaces (Official Method of AnalysisSM 2009.03, Performance Tested MethodSM No. 050602). The method also completed AFNOR validation (following the ISO 16140 standard) compared to the reference method EN ISO 6579. For AFNOR, GDS was given a scope covering all human food, animal feed stuff, and environmental surfaces (Certificate No. TRA02/12-01/09). Results showed that Assurance GDS for Salmonella (GDS) has high sensitivity and is equivalent to the reference culture methods for the detection of motile and non-motile Salmonella. As part of the aforementioned validations, inclusivity and exclusivity studies, stability, and ruggedness studies were also conducted. Assurance GDS has 100% inclusivity and exclusivity among the 100 Salmonella serovars and 35 non-Salmonella organisms analyzed. To add to the scope of the Assurance GDS for Salmonella method, a matrix extension study was conducted, following the AOAC guidelines, to validate the application of the method for selected spices, specifically curry powder, cumin powder, and chili powder, for the detection of Salmonella.

Abstract Nine polyphenols in the aerial parts of Mentha longifolia have been separated by chromatographic techniques. Their structures have been confirmed by HPLC/electrospray ionization-MS/MS. The compounds identified included rosmarinic acid, salvianolic acid L, dedihydro–salvianolic acid, luteolin–glucuronide, luteolin–diglucuronide, luteolin–glucopyranosyl–rhamnopyranoside, and eriodictyol–glucopyranosyl–rhamnopyranoside. The extracts of M. longifolia and M. piperita field plants, in vitro plants, callus tissues, and cell suspension cultures were profiled, and their polyphenol composition was compared in different tissues and quantified using ultra-performance column liquid chromatography (UPLC)/triple-quadrupole-MS in the selected-ion recording detection mode. Determination of desired compounds was based on calibration curves obtained for standards, which were previously isolated from M. longifolia aerial parts. The UPLC profiles revealed considerable differences in the synthesis of secondary metabolites among samples coming from field plants, in vitro plants, callus tissues, and cell suspension cultures. Plant tissues coming from field cultivation (for both M. piperita and M. longifolia) contained several phenolic compounds (flavonoids and phenolic acids), whereas plants from in vitro conditions, callus tissues, and suspension cultures contained only a few of them. Rosmarinic acid dominated in all of these samples. These results show that under in vitro conditions, the metabolism of phenolics undergoes a fundamental change.

La tesi doctoral amb títol "Caracterització clínico‐biològica de les síndromes mielodisplàstiques amb deleció 5q" es basa en una compilació de tres treballs publicats en revistes de prestigi internacional en l'àmbit de l'onco‐hematologia. El principal objectiu de la tesi és l'aprofundiment genètic i clínic de les síndromes mielodisplàstiques (SMD) que presenten com alteració citogenètica la deleció del braç llarg del cromosoma 5 (5q‐). L'abordatge d'aquesta patologia es va fer a partir de diferents tècniques de citogenètica molecular. En el primer dels treballs es va estudiar més de 600 pacients amb diagnòstic de SMD i sense deleció 5q per citogenètica convencional, mitjançant la tècnica de FISH. La deleció 5q es va detectar en un 6% dels casos. En destaca el fet que en aquells casos en que no es disposava d'informació citogenètica, ja que el cultiu de citogenètica convencional no presentava metafases, es va detectar la deleció 5q en un 20% dels casos. Aquests resultats són rellevants ja que hi ha un tractament que és altament eficaç en els pacients que presenten aquesta alteració citogenètica. El segon treball es basa en l'estudi de la història natural de les SMD amb deleció 5q. Es van recollir les dades clíniques i biològiques de més de 500 pacients amb diagnòstic de SMD i que per citogenètica convencional presentaven la deleció 5q. Aquest estudi va permetre definir l'impacte en la supervivència i progressió de la malaltia a leucèmia mieloide aguda de les alteracions citogenètiques acompanyants a la deleció 5q. Aquest estudi ha permès determinar que la presència d'una anomalia citogenètica acompanyant a la deleció 5q no té un efecte significatiu en la supervivència global però sí que té impacte en la progressió de la malaltia a leucèmia mieloide aguda. El tercer treball ha aprofundit en l'estudi genètic de la patologia esmentada mitjançant estudis de microarrays genòmics i seqüenciació directa. A més, a permès la correlació de les seves característiques biològiques amb la resposta al tractament amb lenalidomida. La importància d'aquest treball recau en que una quarta part dels pacients tractats amb lenalidomida no responen al tractament i se'n desconeix el motiu. Aquest estudi ha pogut determinar com la presència d'una alteració citogenètica acompanyant s'associa a una no resposta al tractament. A més, la presència de mutacions en el gen TP53 mostren una tendència a predir la no resposta al tractament. Amb aquesta tesi s'ha pogut aprofundir en el coneixement clínic, biològic i genètic de les SMD amb deleció 5q que han ajudat a la comunitat científica a entendre una mica millor la història natural de la malaltia.
The thesis titled "Clinical and biological characterization of myelodysplastic syndromes with 5q deletion" is based on a compilation of three papers published in international journals in the field of hematology‐oncology. The main objective of this thesis is to go in depth to the genetic and clinical study of myelodysplastic syndromes (MDS) who have a deletion of the long arm of chromosome 5 (5q‐). The approach of this disease was made with molecular cytogenetic techniques. In the first paper, we studied by FISH more than 600 patients with MDS without 5q deletion by conventional cytogenetics. 5q deletion was detected in 6% of cases. It is noteworthy that in those cases in which no cytogenetic information was available, as the culture had no metaphases, 5q deletion was detected in 20% of cases. These results are important because there is a treatment that is highly effective in patients with this cytogenetic alteration. In the second study, we have analyzed the natural history of MDS with 5q deletion. We collected clinical and biological data of more than 500 patients with MDS and 5q deletion by conventional cytogenetics. This study allowed to define the impact, on survival and disease progression to acute myeloid leukemia, of the cytogenetic alterations accompanying the deletion 5q. This study has determined that the presence of a single cytogenetic abnormality accompanying the 5q deletion does not have a significant effect on overall survival but does have impact on disease progression in acute myeloid leukemia. The third work is based on the genetic study, using direct sequencing and genomic microarrays, and its correlation with lenalidomide treatment response. The importance of this work is that around 25% of patients do not respond to treatment with lenalidomide and the reason is unknown. This study has determined that the presence of an accompanying cytogenetic alteration is associated with a non‐response to treatment. In addition, the presence of mutations in the TP53 gene showed a tendency to not predict response to treatment. This thesis has allowed to a better clinical, biological and genetic characterization of MDS with deletion 5q, and have helped the scientific community to better understand the natural history of the disease.