Chemiluminescence and auto-oscillations in the (S−Cr2O 7 2+ −UO 2 2+ ) system

Antipin, V. A.; Parshin, G. S.; Казаков, В. П.; Zagidullin, S. N.

doi:10.1007/bf02064467

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Kazakov et al . (59) published a paper entitled ‘Self‐oscillatory chemiluminescence’ that reported oscillatory CL behavior in an SO 3 Cr 2 O 7 2− UO 2 2+ H 2 SO 4 system. CL was caused by the oxidation of sulfur by ozone and dichromate ion.…”

Section: Other Systemsmentioning

confidence: 99%

Expression of Ol‐KIP, a cyclin‐dependent kinase inhibitor, in embryonic and adult medaka (Oryzias latipes) central nervous system

Nguyen

Candal

Sharif

et al. 2001

Developmental Dynamics

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From an expression screen in a fish model, the medaka, we have isolated Ol-KIP (Oryzias latipes-kinase inhibitor protein), a new member of the KIP subfamily of cyclin-dependent kinase (Cdk) inhibitors. We have analysed its expression in the developing and adult brain by in situ hybridization and by double labeling with Ol-KIP mRNA and proliferating cell nuclear antigen (PCNA) antibodies. Ol-KIP presents a complex expression pattern in several areas of the embryonic central nervous system, most often in close vicinity to proliferative neuroepithelia. We studied in great detail its expression in the optic tectum: Ol-KIP is expressed in a ringshaped domain lying exactly between the proliferative and the postmitotic zones of this structure and is, therefore, potentially involved in cell cycle exit. In the adult CNS, Ol-KIP expression persists in numerous nuclei, both close and distant from proliferative ventricular areas. So, Ol-KIP expression is in part compatible with a sustained "stop signal" role for proliferation, but its expression in postmitotic zones suggests that KIP proteins may have late neuronal function(s), in addition to inhibiting Cdks. This first detailed study of the expression profile of a KIP gene in a nonmammalian vertebrate, thus, opens perspectives for analysing the role of these regulators in brain development and function.

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Section: Other Systemsmentioning

confidence: 99%

Expression of Ol‐KIP, a cyclin‐dependent kinase inhibitor, in embryonic and adult medaka (Oryzias latipes) central nervous system

Nguyen

Candal

Sharif

et al. 2001

Developmental Dynamics

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“…We proposed the mechanism in light of the oxidation by oxochromium VI compounds, [32] the oxidation of thioureas [33] and the evolution of SO 2 (Scheme 4). Other factors were considered; (a) the rapid evolution of SO 2 gas which indicated that the oxidation of sulfur was an earlier step; (b) absence of any traces of elemental sulfur which revealed that oxidation of sulfur has occurred while it was linked to some intermediate; therefore, we ignored that sulfur was separated, in the elemental form, then has oxidized [34] ; (c) sulfur functions are capable to behave free radical reactions [33] ; and (d) the transition metal ions induce free radical reactions. [32] Thus, it was proposed that the reaction started by the attack of the lone pair of electrons, in the C S, at the chromium ions [35] ; the originated chromate anion, in turn, attacked the electron deficient sulfur affording the intermediate [ [36] resulted in splitting of the four-membered ring, providing the analogous 2,4-diones 4 and 5, along with the sulfone intermediate [XI] which gave SO 2 gas via a dehydrogenative single electron cyclization, followed by hydrolysis, then, oxidative degradation step !…”

Section: Resultsmentioning

confidence: 99%

Advancements in synthesis of pharmacologically active imidazolidin‐4‐ones and stereochemistry of their Reactions with some Reagents

Saied

Abdelwahab

Hashem

et al. 2020

Journal of Heterocyclic Chem

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1‐Aryl, 1,3‐diaryl‐ and 5‐(2‐oxo‐2‐arylethyl)‐2‐thioxo‐imidazolidin‐4‐ones 2 were prepared as before, nevertheless, equivalent amounts of potassium hydroxide were added to the reaction conditions. This change, dramatically, reduced the reaction time and highly increased the yield of some derivatives. Treatment of 2 with sulfuric acid converted them into their analogous (E)/(E,Z)‐5‐(2‐oxo‐2‐arylethylidene) derivatives 3. Reactions of 2 and/or 3 with chromium trioxide affected their conversion into the corresponding 2,4‐diones 4 and 5, respectively. Treatment of 2 and/or 3 with ethyl bromoacetate affected conversion of the former into their respective 2,4‐diones 4, whereas it gave the respective 2‐alkylthio derivatives of the latter. Reactions of 2b with aromatic aldehydes gave mixtures of spiro‐1H‐ and 2H‐pyrrole diastereomers. Structures of the new products were evidenced by infrared, EI‐MS, 1H‐ and 13C‐NMR spectroscopic measurements. Many of the selected compounds showed good antimicrobial activity.

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Oscillating chemiluminescence systems: state of the art

et al. 2010

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Oscillating chemiluminescence (CL) was reported for the first time about 30 years ago. Since then several systems based on addition of a chemiluminescent reagent to a known oscillator system or based on the light emitting features of one component of the oscillating system, have been described. This information, scattered in the scientific literature, is compiled in the present paper. Several oscillating CL systems, including those based on Belousov-Zhabotinskii and Orban oscillators, or horseradish peroxidase-catalyzed reactions, among others, are critically presented. The application of this type of oscillatory systems is also discussed, in analytical chemistry and for educational purposes.

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Chemiluminescence and auto-oscillations in the (S−Cr2O 7 2+ −UO 2 2+ ) system

Cited by 4 publications

References 3 publications

Expression of Ol‐KIP, a cyclin‐dependent kinase inhibitor, in embryonic and adult medaka (Oryzias latipes) central nervous system

Expression of Ol‐KIP, a cyclin‐dependent kinase inhibitor, in embryonic and adult medaka (Oryzias latipes) central nervous system

Advancements in synthesis of pharmacologically active imidazolidin‐4‐ones and stereochemistry of their Reactions with some Reagents

Oscillating chemiluminescence systems: state of the art

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