排序方式: 共有35条查询结果,搜索用时 0 毫秒
31.
Nitrosyl complexes with {Ru-NO}6 (4(ClO4)3) and {Ru-NO}7 (4(ClO4)2) configurations have been isolated in the selective molecular framework of [Ru(tpm)(pap)(NO)]n+ (tpm = tris(1-pyrazolyl)methane and pap = 2-phenylazopyridine). The DFT optimized structures of [RuII(tpm)(pap)(NO+)]3+ (43+) and [RuII(tpm)(pap)(NO)]2+ (42+) predict that the Ru-N-O groups in the complexes are in almost linear and bent geometries, respectively. In agreement with largely NO centered reduction a sizeable shift in ν(NO) frequency of 324 cm−1 has been observed on moving from {RuII-NO+} state in 43+ to {RuII-NO) state in 42+. The DFT proposed NO centered spin in {RuII-NO) (42+) (Mulliken spin-densities: 0.860 (NO) and 0.087 (Ru)) has been evidenced by its free radical EPR spectrum with g = 1.989. The strongly electrophilic {RuII-NO+} state in 43+ (ν(NO): 1962 cm−1) can be transformed to the corresponding complex (3+) in the presence of nucleophile, OH− with k = 2.03 × 10−1 M−1 s−1 at 298 K in CH3CN. On irradiation with light the acetonitrile solution of [RuII(tpm)(pap)(NO+)]3+ (43+) undergoes facile photorelease of NO (kNO, s−1 = 0.1 × 10−1 and t1/2, s = 69.3) with the concomitant formation of the solvate [RuII(tpm)(pap)(CH3CN)]2+ (22+). The photoreleased NO can be trapped as an Mb-NO adduct. 相似文献
32.
33.
In mustard(Brassica juncea L.) addition of 20 mM nitrogen (in the form of NaNO3) inhibited after 50 d the activities of carbonic anhydrase and nitrate reductase and net photosynthetic rate. However, when nitrogen was applied in association with the foliar spray of gibberellic acid, the inhibition was reversed and the above parameters and also leaf area index and dry mass were enhanced. 相似文献
34.
Carbonic Anhydrase,Photosynthesis, and Seed Yield in Mustard Plants Treated with Phytohormones 总被引:9,自引:0,他引:9
The leaves of 30-d-old plants of Brassica juncea Czern & Coss cv. Varuna were sprayed with 10–6 M aqueous solutions of indole-3-yl-acetic acid (IAA), gibberellic acid (GA3), kinetin (KIN), and abscisic acid (ABA) or 10–8 M of 28-homobrassinolide (HBR). All the phytohormones, except ABA, improved the vegetative growth and seed yield at harvest, compared with those sprayed with deionised water (control). HBR was most prominent in its effect, generating 32, 30, 36, 70, 25, and 29 % higher values for dry mass, chlorophyll content, carbonic anhydrase (E.C. 4.2.1.1) activity, and net photosynthetic rate in 60-d-old plants, pods per plant, and seed yield at harvest, over the control, respectively. The order of response to various hormones was HBR > GA3 > IAA > KIN > control > ABA. 相似文献
35.
Pratibha Kumari Shagufi Naz Ansari Ravi Kumar Anoop Kumar Saini Shaikh M. Mobin 《化学与生物多样性》2019,16(11)
Here, we report the synthesis and characterization of four new aroyl‐hydrazone derivatives L1 – L4 , and their structural as well as biological activities have been explored. In addition to docking with bovine serum albumin (BSA) and duplex DNA, the experimental results demonstrate the effective binding of L1 – L4 with BSA protein and calf thymus DNA (ct‐DNA) which is in agreement with the docking results. Further biological activities of L1 – L4 have been examined through molecular docking with different proteins which are involved in the propagation of viral or cancer diseases. L1 shows best binding affinity with influenza A virus polymerase PB2 subunit (2VY7) with binding energy ?11.42 kcal/mol and inhibition constant 4.23 nm , whereas L2 strongly bind with the hepatitis C virus NS5B polymerase (2WCX) with binding energy ?10.47 kcal/mol and inhibition constant 21.06 nm . Ligand L3 binds strongly with TGF‐beta receptor 1 (3FAA) and L4 with cancer‐related EphA2 protein kinases (1MQB) with binding energy ?10.61 kcal/mol, ?10.02 kcal/mol and inhibition constant 16.67 nm and 45.41 nm , respectively. The binding energies of L1 – L4 are comparable with binding energies of their proven inhibitors. L1 , L3 and L4 can be considered as both 3FAA and 1MQB dual targeting anticancer agents, while L1 and L3 are both 2VY7 and 2WCX dual targeting antiviral agents. On the other side, L2 and L4 target only one virus related target (2WCX). Furthermore, the geometry optimizations of L1 – L4 were performed via density functional theory (DFT). Moreover, all four ligands ( L1 – L4 ) were characterized by NMR, FT‐IR, ESI‐MS, elemental analysis and their molecular structures were validated by single crystal X‐ray diffraction studies. 相似文献