Study on Detection Methods for Chlorine Precipitation during Biomass and Coal Co-Combustion

2012 ◽  
Vol 229-231 ◽  
pp. 1423-1426
Author(s):  
Yong Zheng Wang ◽  
Lei Jiang ◽  
Mao Zhen Yue ◽  
Su Fang Bian
Keyword(s):  
Silver Nitrate ◽  
Lower Limit ◽  
Spectrophotometric Method ◽  
Flue Gas ◽  
High Sensitivity ◽  
Volumetric Analysis ◽  
Sample Solution ◽  
Detection Methods ◽  
Multiple Measurements ◽  
Blend Fuel

In this paper, three detection methods were analyzed to determine the chlorine precipitation from the flue gas: Silver nitrate volumetric analysis (SNVA), Volhard method (VM) and Mercuric thiocyanate spectrophotometric method (MTSM). Results indicated that SNVA and VM were simple and convenient, but unsuitable for the detection of blend fuel due to the high lower limit. MTSM was suitable for biomass and coal co-combustion for its low lower limit and high sensitivity. In addition, MTSM needed less sample solution, which made it more suitable for multiple measurements to reduce errors, and the maximum proportional error was only 3.5%.

Gold Immunochromatography Assay - A Newly Rapid Detection Technique for Aquatic Products

2013 ◽  
Vol 690-693 ◽  
pp. 1449-1454
Author(s):  
Yuan Wang ◽  
Hui Juan Yu ◽  
Bei Lei Qian ◽  
You Qiong Cai ◽  
Dong Mei Huang ◽  
...  
Keyword(s):  
Rapid Detection ◽  
High Sensitivity ◽  
Detection Technique ◽  
Detection Methods ◽  
Future Perspectives ◽  
Auxiliary Equipment ◽  
Basic Principles ◽  
Aquatic Products ◽  
Immunological Detection

Gold immunochromatography assay (GICA) technique has the following characteristics: rapid and simple, high sensitivity, good specificity, no auxiliary equipment, ease of interpreting results, and satisfactory stability. The technique has become one of the most rapid and sensitive immunological detection methods, which is widely used in medical, biological and other fields. The article focuses on the basic principles and technical characteristics of GICA, and briefly describes the applications and future perspectives in the rapid detection of aquatic products.

A rapid and accurate method for screening T-2 toxin in food and feed using competitive AlphaLISA

2021 ◽  
Vol 368 (6) ◽  
Author(s):  
Liwen Zhang ◽  
Qingyu Lv ◽  
Yuling Zheng ◽  
Xuan Chen ◽  
Decong Kong ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Accurate Method ◽  
Detection Methods ◽  
Cereal Crops ◽  
Detection Range ◽  
Highly Sensitive ◽  
Food And Feed ◽  
Good Repeatability ◽  
Feed Samples ◽  
Better Than

ABSTRACT T-2 is a common mycotoxin contaminating cereal crops. Chronic consumption of food contaminated with T-2 toxin can lead to death, so simple and accurate detection methods in food and feed are necessary. In this paper, we establish a highly sensitive and accurate method for detecting T-2 toxin using AlphaLISA. The system consists of acceptor beads labeled with T-2-bovine serum albumin (BSA), streptavidin-labeled donor beads and biotinylated T-2 antibodies. T-2 in the sample matrix competes with T-2-BSA for antibodies. Adding biotinylated antibodies to the test well followed by T-2 and T-2-BSA acceptor beads yielded a detection range of 0.03–500 ng/mL. The half-maximal inhibitory concentration was 2.28 ng/mL and the coefficient of variation was <10%. In addition, this method had no cross-reaction with other related mycotoxins. This optimized method for extracting T-2 from food and feed samples achieved a recovery rate of approximately 90% in T-2 concentrations as low as 1 ng/mL, better than the performance of a commercial ELISA kit. This competitive AlphaLISA method offers high sensitivity, good specificity, good repeatability and simple operation for detecting T-2 toxin in food and feed.

scholarly journals VLBA+GBT observations of the COSMOS field and radio source counts at 1.4 GHz

2018 ◽  
Vol 616 ◽  
pp. A128 ◽  
Author(s):  
N. Herrera Ruiz ◽  
E. Middelberg ◽  
A. Deller ◽  
V. Smolčić ◽  
R. P. Norris ◽  
...  
Keyword(s):  
Radio Source ◽  
Flux Density ◽  
Lower Limit ◽  
High Sensitivity ◽  
Host Galaxy ◽  
Radio Sources ◽  
Source Population ◽  
Star Forming ◽  
Brightness Temperatures ◽  
Long Baseline

We present very long baseline interferometry (VLBI) observations of 179 radio sources in the COSMOS field with extremely high sensitivity using the Green Bank Telescope (GBT) together with the Very Long Baseline Array (VLBA) (VLBA+GBT) at 1.4 GHz, to explore the faint radio population in the flux density regime of tens of μJy. Here, the identification of active galactic nuclei (AGN) is based on the VLBI detection of the source, meaning that it is independent of X-ray or infrared properties. The milli-arcsecond resolution provided by the VLBI technique implies that the detected sources must be compact and have large brightness temperatures, and therefore they are most likely AGN (when the host galaxy is located at z ≥ 0.1). On the other hand, this technique only allows us to positively identify when a radio-active AGN is present, in other words, we cannot affirm that there is no AGN when the source is not detected. For this reason, the number of identified AGN using VLBI should be always treated as a lower limit. We present a catalogue containing the 35 radio sources detected with the VLBA+GBT, ten of which were not previously detected using only the VLBA. We have constructed the radio source counts at 1.4 GHz using the samples of the VLBA and VLBA+GBT detected sources of the COSMOS field to determine a lower limit for the AGN contribution to the faint radio source population. We found an AGN contribution of >40−75% at flux density levels between 150 μJy and 1 mJy. This flux density range is characterised by the upturn of the Euclidean-normalised radio source counts, which implies a contribution of a new population. This result supports the idea that the sub-mJy radio population is composed of a significant fraction of radio-emitting AGN, rather than solely by star-forming galaxies, in agreement with previous studies.

High-sensitivity thiocyanate spectrophotometric method for determination of perrhenate, an analogue of radioactive pertechnetate, under acidic condition

2018 ◽  
Vol 73 (5) ◽  
pp. 1093-1101 ◽  
Author(s):  
Hui Hu ◽  
Long-Li Sun ◽  
Yan-Ling Gao ◽  
Tian Wang ◽  
Yue-Fei Zhang ◽  
...  
Keyword(s):  
Spectrophotometric Method ◽  
High Sensitivity ◽  
Acidic Condition

scholarly journals CircRNAs and their regulatory roles in cancers

2021 ◽  
Vol 27 (1) ◽  
Author(s):  
Mei Tao ◽  
Ming Zheng ◽  
Yanhua Xu ◽  
Shuo Ma ◽  
Weiwei Zhang ◽  
...  
Keyword(s):  
Nuclear Export ◽  
Mrna Translation ◽  
High Sensitivity ◽  
Detection Methods ◽  
Circular Rnas ◽  
Rnase L ◽  
Circular Structure ◽  
Dynamic Modification ◽  
Non Coding Rnas

AbstractCircular RNAs (circRNAs), a novel type of non-coding RNAs (ncRNAs), have a covalently closed circular structure resulting from pre-mRNA back splicing via spliceosome and ribozymes. They can be classified differently in accordance with different criteria. As circRNAs are abundant, conserved, and stable, they can be used as diagnostic markers in various diseases and targets to develop new therapies. There are various functions of circRNAs, including sponge for miR/proteins, role of scaffolds, templates for translation, and regulators of mRNA translation and stability. Without m7G cap and poly-A tail, circRNAs can still be degraded in several ways, including RNase L, Ago-dependent, and Ago-independent degradation. Increasing evidence indicates that circRNAs can be modified by N-6 methylation (m6A) in many aspects such as biogenesis, nuclear export, translation, and degradation. In addition, they have been proved to play a regulatory role in the progression of various cancers. Recently, methods of detecting circRNAs with high sensitivity and specificity have also been reported. This review presents a detailed overview of circRNAs regarding biogenesis, biomarker, functions, degradation, and dynamic modification as well as their regulatory roles in various cancers. It’s particularly summarized in detail in the biogenesis of circRNAs, regulation of circRNAs by m6A modification and mechanisms by which circRNAs affect tumor progression respectively. Moreover, existing circRNA detection methods and their characteristics are also mentioned.

scholarly journals Development of the UV Spectrophotometric Method of Azithromycin in API and Stress Degradation Studies

2016 ◽  
Vol 68 ◽  
pp. 48-53 ◽  
Author(s):  
Sandip Bhimani ◽  
Gaurav Sanghvi ◽  
Trupesh Pethani ◽  
Gaurav Dave ◽  
Vishal Airao ◽  
...  
Keyword(s):  
Linear Relationship ◽  
Spectrophotometric Method ◽  
Phosphate Buffer ◽  
Macrolide Antibiotic ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Limit Of Quantification ◽  
Absorbance Maximum ◽  
Antibiotic Drug ◽  
Stress Degradation

Azithromycin (AZI) is a semi-synthetic macrolide antibiotic drug, effective against a wide variety of bacteria. The present study describes a simple, accurate, reproducible and precise UV Spectrophotometric method for the estimation of AZI (pH 6.8 Phosphate buffer). The absorbance maximum (λmax) for AZI was found to be 208nm. The method reveals high sensitivity, with linearity in the 10 µg/ml to 50 µg/ml range. The lower limit of detection was found to be 1.6µg/ml and the limit of quantification was found to be 5µg/ml. All the calibration curves demonstrated a linear relationship between the absorbance and concentration, with the correlation coefficient higher than 0.99. The % recovery was found to be 99.72%. AZI was also subjected to stress degradation under different conditions recommended by the International Conference on Harmonization (ICH).

Determination of Sulfonylurea Herbicides in Grains by Capillary Electrophoresis

1995 ◽  
Vol 78 (4) ◽  
pp. 1091-1096 ◽  
Author(s):  
Alexander J Krynitsky ◽  
Douglas M Swtneford
Keyword(s):  
Capillary Electrophoresis ◽  
Lower Limit ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Residue Analysis ◽  
High Sensitivity ◽  
Sulfonylurea Herbicides ◽  
Optical Cell ◽  
Liquid Chromatographic ◽  
Tribenuron Methyl

Abstract A capillary electrophoresis (CE) method was developed to separate and determine residues of 5 sulfonylurea herbicides in grains (wheat, barley, and corn). This work demonstrated the practicality of using CE for residue analysis of sulfonylureas. The method yielded good recoveries and adequate sensitivities at tolerance levels (0.05–0.1 ppm). The compounds investigated were metsulfuron methyl (Ally), thifensulfuron methyl (Harmony), chlorsulfuron (Glean), rimsulfuron (DPX-E9636), and tribenuron methyl (Express). Acetonitrile extracts of grain samples were partitioned with hexane and then cleaned up with cation exchange solid-phase extraction cartridges. Quantitation was performed by micellar electrokinetic capillary chromatography using a high-sensitivity optical cell. Average recoveries at the 0.05 ppm level ranged from 72.9 to 118.5%. The lower limit of detection was approximately 0.02 ppm, except for rimsulfuron and tribenuron methyl, for which the lower limit of detection was 0.035 ppm. The method was less complicated and showed better sensitivity than current single-analyte liquid chromatographic enforcement methods.

scholarly journals Progress in the Pathogenesis, Diagnosis, and Treatment of TSH-Secreting Pituitary Neuroendocrine Tumor

2020 ◽  
Vol 11 ◽  
Author(s):  
Peiqiong Luo ◽  
Lin Zhang ◽  
Lidan Yang ◽  
Zhenmei An ◽  
Huiwen Tan
Keyword(s):  
Neuroendocrine Tumor ◽  
Clinical Manifestations ◽  
High Sensitivity ◽  
Mass Effect ◽  
Pituitary Hormones ◽  
Diagnosis And Treatment ◽  
Detection Methods ◽  
Thyroid Goiter ◽  
Magnetic Resonance Imaging Mri ◽  
Timely Treatment

TSH-secreting pituitary neuroendocrine tumor (PitNET) is one of the causes of central hyperthyroidism. The incidence of TSH PitNET is far lower than that of other PitNETs. The clinical manifestations of TSH PitNETs mainly include thyrotoxicosis or thyroid goiter, secretion disorders of other anterior pituitary hormones, and mass effect on the pituitary gland and its surrounding tissues. The application of high-sensitivity TSH detection methods contributes to the early diagnosis and timely treatment of TSH PitNETs. Improvements in magnetic resonance imaging (MRI) have advanced the noninvasive visualization of smaller PitNETs. Treatments for TSH PitNETs include surgery, drugs, and radiotherapy. This review focuses on the progress in pathogenesis, diagnosis, and treatment of TSH PitNETs to provide more information for the clinician.

Improved determination of cytochrome b5 in human erythrocytes.

1984 ◽  
Vol 30 (8) ◽  
pp. 1344-1347 ◽  
Author(s):  
A Kaftory ◽  
E Hegesh
Keyword(s):  
Spectrophotometric Method ◽  
Cytochrome B5 ◽  
High Sensitivity ◽  
Human Erythrocytes ◽  
Healthy Individuals ◽  
Mean Values

Abstract A sensitive, precise enzymic/spectrophotometric method for determining cytochrome b5 in small amounts of blood is described. Mean values for healthy individuals, ages 20 to 70 years, were 0.26 (SD 0.03) mumol per liter of erythrocytes or 0.87 (SD 0.14) nmol per gram of hemoglobin. We believe the assay is preferable to methods described hitherto, primarily because of its high sensitivity.

scholarly journals Application of Electrochemical Sensors Based on Carbon Nanomaterials for Detection of Flavonoids

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2020
Author(s):  
Jinchun Hu ◽  
Zhenguo Zhang
Keyword(s):  
Carbon Nanomaterials ◽  
Electrochemical Sensors ◽  
Graphene Quantum Dots ◽  
High Sensitivity ◽  
Research Field ◽  
Electrochemical Sensing ◽  
Detection Methods ◽  
Health Issues ◽  
Fast Detection ◽  
Anti Cancer

Flavonoids have a variety of physiological activities such as anti-free radicals, regulating hormone levels, antibacterial factors, and anti-cancer factors, which are widely present in edible and medicinal plants. Real-time detection of flavonoids is a key step in the quality control of diverse matrices closely related to social, economic, and health issues. Traditional detection methods are time-consuming and require expensive equipment and complicated working conditions. Therefore, electrochemical sensors with high sensitivity and fast detection speed have aroused extensive research interest. Carbon nanomaterials are preferred material in improving the performance of electrochemical sensing. In this paper, we review the progress of electrochemical sensors based on carbon nanomaterials including carbon nanotubes, graphene, carbon and graphene quantum dots, mesoporous carbon, and carbon black for detecting flavonoids in food and drug homologous substances in the last four years. In addition, we look forward to the prospects and challenges of this research field.

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