نتایج جستجو برای: intermediate ring
تعداد نتایج: 251397 فیلتر نتایج به سال:
Abstract Photodegradation of azilsartan produces a phenanthridine derivative, with its molecular structure determined by 1H and 13C NMR spectroscopy. This is confirmed single-crystal X-ray diffraction alternative synthesis. The ring formation explained through the closure an imidoylnitrene intermediate produced decarboxylation 5-oxo-1,2,4-oxadiazole (oxadiazolone).
Symmetry-free cryo-EM structures of the chaperonin TRiC along its ATPase-driven conformational cycle
The eukaryotic group II chaperonin TRiC/CCT is a 16-subunit complex with eight distinct but similar subunits arranged in two stacked rings. Substrate folding inside the central chamber is triggered by ATP hydrolysis. We present five cryo-EM structures of TRiC in apo and nucleotide-induced states without imposing symmetry during the 3D reconstruction. These structures reveal the intra- and inter...
in this paper, we introduce the new notion of n-f-clean rings as a generalization of f-clean rings. next, we investigate some properties of such rings. we prove that mn(r) is n-f-clean for any n-f-clean ring r. we also, get a condition under which the de nitions of n-cleanness and n-f-cleanness are equivalent.
a topoframe, denoted by $l_{ tau}$, is a pair $(l, tau)$ consisting of a frame $l$ and a subframe $ tau $ all of whose elements are complementary elements in$l$. in this paper, we define and study the notions of a$tau $-real-continuous function on a frame $l$ and the set of realcontinuous functions $mathcal{r}l_tau $ as an $f$-ring.we show that $mathcal{r}l_{ tau}$is actually a generalization ...
for a fixed positive integer , we say a ring with identity is n-generalized right principally quasi-baer, if for any principal right ideal of , the right annihilator of is generated by an idempotent. this class of rings includes the right principally quasi-baer rings and hence all prime rings. a certain n-generalized principally quasi-baer subring of the matrix ring are studied, and connections...
Glutamate, a proposed precursor of the pyrrolidine ring of nicotine, was isolated and degraded after metabolism of 14C02 for 6 hours by Nicotiana rustica and Nicotiana glutinosa and after metabolism of acetate-2J4C for 2 hours by N. rustica. The 14C distribution in glutamate from N. glutinosa after 6 hours of W02 metabolism was 20.2, 14.3, 13.9, 24.4, and 26.6%, in C-l through C-5, respectively...
Polyubiquitination by E2 and E3 enzymes is a predominant mechanism regulating protein function. Some RING E3s, including anaphase-promoting complex/cyclosome (APC), catalyze polyubiquitination by sequential reactions with two different E2s. An initiating E2 ligates ubiquitin to an E3-bound substrate. Another E2 grows a polyubiquitin chain on the ubiquitin-primed substrate through poorly defined...
A new enantioselective total synthesis of pachastrissamine (jaspine B) was achieved from a known alpha,beta-unsaturated aldehyde by utilizing Córdova's asymmetric epoxidation as the chirality-inducing step. The 2,3-cis stereochemistry of pachastrissamine was established via intramolecular epoxide ring opening of a gamma,delta-epoxy-alpha,beta-unsaturated ester intermediate coupled with oxy-Mich...
There is considerable evidence that a critical reaction in purine synthesis is the closure of the purine ring by the addition of a “formate” group to 4-amino-5-imidazolecarboxamide ribonucleotide (1). Apparently the “formate” is added as an active intermediate, since formate as such has little effect in stimulating purine synthesis. Indeed, there is a demonstrable difference in the utilization ...
The synthesis and antimicrobial activity heterocyclic analogs of the diterpenoid totarol are described. An advanced synthetic intermediate with a ketone on the A-ring is used to attach fused heterocycles and a carbon-to-nitrogen atom replacement is made on the B-ring by de novo synthesis. A-ring analogs with an indole attached exhibit, for the first time, enhanced antimicrobial activity relativ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید