Search results for "InSe"
showing 10 items of 3069 documents
The Bee Laboratory
1937
Mechanistic Study of Stepwise Methylisocyanide Coupling and C-H Activation Mediated by a Low-Valent Main Group Molecule
2013
An experimental and DFT investigation of the mechanism of the coupling of methylisocyanide and C-H activation mediated by the germylene (germanediyl) Ge(Ar(Me6))2 (Ar(Me6) = C6H3-2,6(C6H2-2,4,6-Me3)2) showed that it proceeded by initial MeNC adduct formation followed by an isomerization involving the migratory insertion of the MeNC carbon into the Ge-C ligand bond. Addition of excess MeNC led to sequential insertions of two further MeNC molecules into the Ge-C bond. The insertion of the third MeNC leads to methylisocyanide methyl group C-H activation to afford an azagermacyclopentadienyl species. The X-ray crystal structures of the 1:1 (Ar(Me6))2GeCNMe adduct, the first and final insertion …
Reactivity and Selectivity of Ortho-Metalated Rhodium(II) Complexes in C−H Insertion Reactions of α-Diazo Compounds
1998
Regioselective intramolecular C−H insertion reactions of α-diazo β-keto esters and α-diazo ketones are mediated by Rh2[OOCR]4-x[PC]x (x = 1, 2; PC = ortho-metalated phosphine; R = CH3, C3F7). In particular, the intramolecular transformation of 1-diazo-5-methyl-3-propyl-2-hexanone catalyzed by Rh2[OOCCH3]2[PC]2 (PC = (C6H4)P(C6H5)2, head-to-tail (H−T) configuration) afforded only the tertiary C−H insertion product. By comparison, no C−H insertion reaction was promoted by doubly metalated complexes with a head-to-head (H−H) configuration. Rh2[OOCR]3[PC] compounds were found to be less suited for these type of reactions.
Chemo-orientation responses in hymenopteran parasitoids induced by substrate-borne semiochemicals
2013
Hymenopteran parasitoids can utilize substrate-borne semiochemicals released by conspecifics or by their hosts, increasing the likelihood of successful mating and host location. According to the literature, two substrate-borne chemo-orientation patterns can occur: (1) biased random searching, a non-directional reaction toward the chemicals (kinesis), and (2) trailfollowing searching, a directional response toward the source emitting the chemical compounds (taxis). These two different strategies can be adopted by parasitoids to locate hosts and mates. In host location, random searching is induced by allelochemicals indirectly associated with the host, whereas trail-following behavior is indu…
La valutazione della chiamata in correità in una nota vicenda cautelare
2011
Nella vicenda cautelare per l’omicidio della giovane Sarah Scazzi il giudice propone una valutazione della chiamata di correo che sfugge alle rigorose griglie logico-temporali imposte dalla giurisprudenza della Corte di Cassazione, facendo richiamo a una lettura complessiva e contestuale di tutte le scansioni del percorso di verifica.
How consistent are the transcriptome changes associated with cold acclimation in two species of the Drosophila virilis group?
2015
This work was financially support by a Marie Curie Initial Training Network grant, “Understanding the evolutionary origin of biological diversity” (ITN-2008–213780 SPECIATION), grants from the Academy of Finland to A.H. (project 132619) and M.K. (projects 268214 and 272927), a grant from NERC, UK to M.G.R. (grant NE/J020818/1), and NERC, UK PhD studentship to D.J.P. (NE/I528634/1). For many organisms the ability to cold acclimate with the onset of seasonal cold has major implications for their fitness. In insects, where this ability is widespread, the physiological changes associated with increased cold tolerance have been well studied. Despite this, little work has been done to trace chang…
La gaozhong o scuola secondaria di secondo grado nel sistema scolastico della Repubblica Popolare Cinese
2020
L'articolo inquadra la scuola secondaria di secondo grado, gaozhong, nel sistema scolastico cinese. Il XX secolo in Cina si caratterizza per una successione di trasformazioni epocali che nel tempo hanno cambiato il volto del Paese. In particolare, dopo la conclusione del lungo e contraddittorio decennio della Rivoluzione culturale (1966-1976), che aveva determinato la chiusura delle scuole secondarie di ogni grado e delle università con la successiva dispersione degli studenti nelle aree rurali, è stato necessario ricostruire il sistema scolastico nella sua interezza. Infatti, le scuole non erano più praticabili, molti professori erano stati sottoposti a critica e gli studenti erano stati a…
Alteration of a Cry1A Shared Binding Site in a Cry1Ab-Selected Colony of Ostrinia furnacalis
2022
The Asian corn borer, Ostrinia furnacalis (Guenée, 1854), is a highly damaging pest in Asia and the Pacific islands, and larvae feed mainly from corn crops. To determine the suitability of Bt-corn technology for the future control of this pest, understanding the potential to develop resistance to Cry1Ab and the basis of cross-resistance to other Cry1 proteins is of great interest. Here, we have explored the binding of Cry1A proteins to brush border membrane vesicles from two O. furnacalis colonies, one susceptible (ACB-BtS) and one laboratory-selected with Cry1Ab (ACB-AbR). The insects developed resistance to Cry1Ab and showed cross-resistance to Cry1Aa, Cry1Ac, and Cry1F. Binding assays wi…
Processing of RNAs of the Family Avsunviroidae in Chlamydomonas reinhardtii Chloroplasts
2007
ABSTRACT The family Avsunviroidae comprises four viroid species with the ability to form hammerhead ribozymes that mediate self-cleavage of the multimeric plus and minus strands resulting from replication in the chloroplast through a symmetric rolling-circle mechanism. Research on these RNAs is restricted by their host range, which is limited to the plants wherein they were initially identified and some closely related species. Here we report cleavage and ligation in transplastomic Chlamydomonas reinhardtii expressing plus- and minus-strand dimeric transcripts of representative members of the family Avsunviroidae . Despite the absence of viroid RNA-RNA transcription, the C. reinhardtii -bas…
Le syndrome du diplôme et le chômage des jeunes diplômés, le cas de la Haute-Volta
1983
Référence interne : 83046