Determination of dimethoate residue in some vegetables and cotton plants

1979 ◽  
Vol 22 (1) ◽  
pp. 726-730 ◽  
Author(s):  
M. H. Belal ◽  
E. A. A. Gomaa
Keyword(s):  
Cotton Plants

scholarly journals Determination of 7B3 Residues in Cotton Plants by Liquid Chromatography/Mass Spectrometry

2009 ◽  
Vol 92 (1) ◽  
pp. 302-306 ◽  
Author(s):  
Xiao-Jing Yan ◽  
Xiao-Mei Liang ◽  
Yan-Jun Xu ◽  
Shu-Hui Jin ◽  
Dao-Quan Wang
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Limit Of Detection ◽  
Reversed Phase ◽  
Liquid Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Relative Standard ◽  
Limit Of Quantitation ◽  
Cotton Plants

Abstract A method was developed for the determination of 7B3 (12-propyloxyimino-1,15-pentadecanlactam), a novel macrolactam fungicide, by liquid chromatography/mass spectrometry (LC/MS) with positive electrospray ionization (ESI+). The method used a reversed-phase C18 column and acetonitrilewater (60 + 40, v/v) mobile phase. The quick, easy, cheap, effective, rugged, and safe method was used for extraction of 7B3 from cotton plants, which involved the extraction of 10 g homogenized sample with 10 mL acetonitrile, followed by the addition of 4 g anhydrous MgSO4 and 1.0 g NaCl. After centrifugation, 1 mL of the buffered acetonitrile extract was transferred into a tube containing 50 mg primary secondary amine sorbent and 100 mg anhydrous MgSO4. After shaking and centrifugation, the final extract was transferred to an autosampler vial for concurrent analysis by LC/MS. The results of 7B3 determined by LC/MS in the selective ion monitoring mode were linear, and the matrix effect of the method was evaluated. The average recoveries of 7B3 fortified at different levels were within 84.1100.2, and the relative standard deviations were <7.5 for all samples analyzed. The method limit of detection and the limit of quantitation values were 0.03 and 0.1 mg/kg, respectively. The proposed method was successfully applied to determine 7B3 residues in practical samples. This method is sensitive, accurate, reliable, simple, and safe.

scholarly journals Adsorbent-SERS Technique for Determination of Plant VOCs from Live Cotton Plants and Dried Teas

ACS Omega ◽  
2020 ◽  
Vol 5 (6) ◽  
pp. 2779-2790 ◽  
Author(s):  
Jinhyuk Park ◽  
J. Alex Thomasson ◽  
Cody C. Gale ◽  
Gregory A. Sword ◽  
Kyung-Min Lee ◽  
...  
Keyword(s):  
Cotton Plants

scholarly journals Application of a robust microplate assay to determine induced β-1,3-glucanase and chitinase activity in the cotton plant

BioTechniques ◽  
2021 ◽  
Author(s):  
Muhammad Fahad Khan ◽  
Ummad-ud-din Umar
Keyword(s):  
Viral Infection ◽  
Induced Resistance ◽  
Reducing Sugars ◽  
Cost Effective ◽  
Biochemical Parameter ◽  
Chitinase Activity ◽  
Microplate Assay ◽  
Glucanase Activity ◽  
Cotton Plants

Resistance is induced in cotton plants as the result of either viral infection or exogenous application of elicitors. Induced resistance can be evaluated by determining the production of β-1,3-glucanase and chitinase in plants as a biochemical parameter. The assays being used for the determination of chitinase and β-1,3-glucanase activity are laborious and not cost-effective, as the reducing sugars produced by the substrates colloidal chitin and laminarin are very expensive. The concentration of both substrates was standardized and reduced to 0.25% from 4% in a modified microplate assay, which appeared to be more effective. The amount of β-1,3-glucanase and chitinase produced was significant and determined by the new modified assay. The sensitivity of the microplate assay was significantly raised approximately one- to twofold.

scholarly journals Determination of Molecular and Biochemical Changes in Cotton Plants Mediated by Mealybug

2014 ◽  
Vol 70-71 ◽  
pp. 39-45 ◽  
Author(s):  
Shazia Shafique ◽  
Aqeel Ahmad ◽  
Sobiya Shafique ◽  
Tehmina Anjum ◽  
Waheed Akram ◽  
...  
Keyword(s):  
Biochemical Changes ◽  
Cotton Plants

scholarly journals Physiological response of cotton seeds treated with thiamethoxam under heat stress

2016 ◽  
Vol 38 (2) ◽  
pp. 140-147 ◽  
Author(s):  
Luciana Regina Lauxen ◽  
Andréia da Silva Almeida ◽  
Cristiane Deuner ◽  
Géri Eduardo Meneghello ◽  
Francisco Amaral Villela
Keyword(s):  
Low Temperature ◽  
Chlorophyll Content ◽  
Water Availability ◽  
Seed Treatment ◽  
Shoot Length ◽  
Root And Shoot Length ◽  
Cotton Plants ◽  
Emergence Percentage ◽  
Cotton Seeds

Abstract: This study aimed to verify the effect of seeds treated with thiamethoxam on the emergence, growth and chlorophyll content of seedlings of two cotton cultivars subjected to abiotic stress. The seeds used were from the DeltaOpal and NuOpal cultivars, each one represented by three lots, previously subjected to determination of moisture content, germination and vigor (low temperature germination). Then, the seeds from each lot, treated with thiamethoxam at a dose of 600 mL of product per 100 kg-1 seed or not, were exposed to temperature (18, 25 and 35 °C) and water availability (40, 60 and 80%) stress conditions. The emergence percentage, the root and shoot length, and the chlorophyll content were evaluated. The growth of cotton seedlings from the DeltaOpal and NuOpal cultivars, subjected to low temperature conditions and water availability of 40 to 60%, is favored by seed treatment with thiamethoxam. Seed treatment with thiamethoxam increases chlorophyll content during the development of cotton plants.

Determination of Gossypol Enantiomer Ratio in Cotton Plants by Chiral Higher-Performance Liquid Chromatography

2004 ◽  
Vol 52 (19) ◽  
pp. 5822-5827 ◽  
Author(s):  
Quezia B. Cass ◽  
Regina V. Oliveira ◽  
Angela C. De Pietro
Keyword(s):  
Liquid Chromatography ◽  
Cotton Plants

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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