Nectariless Cotton: Effect on Cotton Leafperforator and Other Cotton Insects in Arizona12

1977 ◽  
Vol 70 (6) ◽  
pp. 797-799 ◽  
Author(s):  
T. J. Henneberry ◽  
L. A. Bariola ◽  
D. L. Kittock
Keyword(s):  
Cotton Effect ◽  
Cotton Insects

Evaluation of Different Synthetic Routes to (2R,3R)-3-Hydroxymethyl-2-(4-hydroxy- 3-methoxyphenyl)-1,4-Benzodioxane-6-Carbaldehyde

2020 ◽  
Vol 23 (26) ◽  
pp. 2960-2968
Author(s):  
Renáta Kertiné Ferenczi ◽  
Tünde-Zita Illyés ◽  
Sándor Balázs Király ◽  
Gyula Hoffka ◽  
László Szilágyi ◽  
...  
Keyword(s):  
Absolute Configuration ◽  
Stereoselective Synthesis ◽  
Cotton Effect ◽  
Enantioselective Synthesis ◽  
Aryl Group ◽  
Target Molecule ◽  
Synthetic Routes ◽  
The Absolute

The reported enantioselective synthesis for the preparation of (+)-(2R,3R)-2-(4- hydroxy-3-methoxyphenyl)-3-hydroxymethyl-1,4-benzodioxane-6-carbaldehyde, precursor for the stereoselective synthesis of bioactive flavanolignans, could not be reproduced. Thus, the target molecule was prepared via the synthesis and separation of diastereomeric O-glucosides. TDDFT-ECD calculations and the 1,4-benzodioxane helicity rule were utilized to determine the absolute configuration. ECD calculations also confirmed that the 1Lb Cotton effect is governed by the helicity of the heteroring, while the higher-energy ECD transitions reflect mainly the orientation of the equatorial C-2 aryl group.

Outer-sphere interaction of (S)-asparagine and (S)-glutamine with [Co(NH3)6]3+ ion and its possible role in ligand substitution

1987 ◽  
Vol 52 (10) ◽  
pp. 2457-2459
Author(s):  
František Jursík
Keyword(s):  
Amino Acids ◽  
Transition Region ◽  
Alkaline Medium ◽  
Optical Activity ◽  
Substitution Reaction ◽  
Outer Sphere ◽  
Ligand Substitution ◽  
Cotton Effect ◽  
Negative Cotton Effect

Optical activity of the achiral cation [Co(NH3)6]3+ is induced both by (S)-AsnONa and (S)-GlnONa, as shown by a negative Cotton effect in the 1A1g → 1T1g transition region. An outer-sphere interaction by three-point attachment of the amides can explain the fact that substitution reaction of [Co(NH3)6]3+ with the mentioned amides in an alkaline medium is unusually slow as compared with other amino acids.

Photoresponsive chiral vesicles as a light harvesting matrix with tunable chiroptical properties

Nanoscale ◽  
2021 ◽  
Author(s):  
Zhaozhen Cao ◽  
Aiyou Hao ◽  
Pengyao Xing
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Cotton Effect ◽  
Chiroptical Properties ◽  
Self Assembled

Self-assembled vesicles show photoresponsive Cotton effect and CPL activities, which also perform as a matrix for energy transfer-based CPL material.

Laboratory and Cage Tests with Newer Insecticides to Control Cotton Insects

1947 ◽  
Vol 40 (4) ◽  
pp. 568-569
Author(s):  
E. E. Ivy ◽  
K. P. Ewing
Keyword(s):  
Cotton Insects

scholarly journals The structure of bacilysin and other products of Bacillus subtillis

1970 ◽  
Vol 118 (4) ◽  
pp. 563-570 ◽  
Author(s):  
J. E. Walker ◽  
E. P. Abraham
Keyword(s):  
Methyl Ester ◽  
Proton Magnetic Resonance Spectrum ◽  
Cotton Effect ◽  
Optical Rotatory Dispersion ◽  
Keto Group ◽  
Spin Splitting ◽  
Unsaturated Ketone ◽  
Epoxide Group ◽  
Group 4 ◽  
Optical Rotatory Dispersion Curve

1. Mass spectra of the trimethylsilyl derivative and the methyl ester of the N-trifluoroacetyl derivative of bacilysin indicated that the antibiotic had a molecular weight of 270. Several peaks in the spectrum of the methyl ester were consistent with the presence of an N-terminal alanine residue in the molecule. 2. The proton-magnetic-resonance spectrum of bacilysin confirmed that the antibiotic contained an epoxide group and the spin–spin splitting of the protons of the epoxide group indicated that the side chain of the epoxycyclohexanone ring was attached at C-4 and was αβ to the keto group. 3. The formation of an αβ-unsaturated ketone on reduction of bacilysin with chromous chloride also showed that the epoxide was αβ to the keto group. 4. The optical-rotatory-dispersion curve of bacilysin showed a positive Cotton effect. On the assumption that the reversed Octant rule for αβ-epoxyketones was applicable this revealed the absolute stereochemistry and enabled a definitive structure to be assigned to the molecule. 5. Similar measurements showed that substance AA1, isolated from culture supernatants, was the C-terminal amino acid of bacilysin. 6. Hydrolysis of substance P2 with leucine aminopeptidase and the mass spectrum of the methyl ester of its N-trifluoroacetyl derivative showed that this substance was l-analyl-l-alanine. 7. These results are discussed in relation to the biogenesis of bacilysin.

scholarly journals Entomotoxic proteins of Beauveria bassiana Bals. (Vuil.) and their virulence against two cotton insects pests

2021 ◽  
pp. 101595
Author(s):  
Majesh Tomson ◽  
Kitherian Sahayaraj ◽  
Samy Sayed ◽  
Sayed-Ashraf Elarnaouty ◽  
Ganeshan Petchidurai
Keyword(s):  
Beauveria Bassiana ◽  
Cotton Insects
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