Synthesis and characterization of the new mixed-metal,mixed-chalcogen clusters Fe2 M(CO)10(μ3-S)(μ3-Te) (M=W,Mo). crystal structure of Fe2W(CO)10(μ3-S)(μ3-Te)

The new clusters Fe₂ M(CO)₁₀(µ₃-S)(µ₃-Te), I (M=W) and 2 (M=Mo) have been isolated from the room temperature reaction of Fe₂(CO)₆(µ-STe) andM(CO)₅(THF) (M=W, Mo), respectively. Compounds1 and2 have been characterized by IR, 125 Te NMR spectroscopy, and elemental analysis. The structure of compound1 has been established by X-ray crystallography. It belongs to the triclinic space groupP witha=6.844(2) Å,b=9.397(2) Å,c=13.681(10) Å, =81.64(2)°,=81360r,=812(2)°,V=861.2(3) ų,Z=2,D _e =2.835 g cm^–3. Full-matrix least-squares refinement of1 converged to R=0.043, andR _w .=0.115. The structure consists of a Fe₂ WSTe square pyramid and the W atom occupies the apical site of the square pyramid.     

Study of energy transfer from 7-amino coumarin donors to the rhodamine 6G acceptor in lecithin vesicles and sodium taurocholate-lecithin mixed aggregates

The energy transfer using 7-amino coumarin dyes as the donor and rhodamine 590 (Rh6G) as the acceptor was investigated in lecithin vesicles and sodium taurocholate (NaTC)-lecithin mixed aggregates using steady-state and time-resolved fluorescence spectroscopy. All energy transfer parameters were calculated. The coumarin 153-Rh6G pair is the most efficient donor-acceptor pair as reflected by the value of k(ET). With addition of NaTC in lecithin, in the case of the coumarin 153-Rh6G pair, the energy transfer rate or efficiency does not change very much, whereas in the case of the coumarin 151-Rh6G pair, the energy transfer rate decreases 2-fold upon going from lecithin vesicles to NaTC-lecithin mixed aggregates where the molar ratio is 2.5. It is mainly due to the deeper location of coumarin 153 in the lipid bilayer or in mixed aggregates. Rotational relaxation data also support this idea.     

Recycled de-Oiled Algal Biomass Extract as a Feedstock for Boosting Biodiesel Production from <Emphasis Type="Italic">Chlorella minutissima</Emphasis>

The investigation for the first time assesses the efficacy of recycled de-oiled algal biomass extract (DABE) as a cultivation media to boost lipid productivity in Chlorella minutissima and its comparison with Bold’s basal media (BBM) used as control. Presence of organic carbon (3.8 ± 0.8 g/l) in recycled DABE resulted in rapid growth with twofold increase in biomass productivity as compared to BBM. These cells expressed four folds higher lipid productivity (126 ± 5.54 mg/l/d) as compared to BBM. Cells cultivated in recycled DABE showed large sized lipid droplets accumulating 54.12 % of lipid content. Decrement in carbohydrate (17.76 %) and protein content (28.12 %) with loss of photosynthetic pigments compared to BBM grown cells were also recorded. The fatty acid profiles of cells cultivated in recycled DABE revealed the dominance of C16:0 (39.66 %), C18:1 (29.41 %) and C18:0 (15.82 %), respectively. This model is self-sustained and aims at neutralizing excessive feedstock consumption by exploiting recycled de-oiled algal biomass for cultivation of microalgae, making the process cost effective.     

Null infinity,the BMS group and infrared issues

There has been a recent resurgence of interest in the structure of the gravitational field at null infinity, sparked by new results on soft charges and infrared issues related to the S matrix theory in perturbative quantum gravity. We summarize these developments and put them in the broader context of research in the relativity community that dates back to several decades. In keeping with intent of this series, this overview is addressed to gravitational scientists who are not experts in this specific area.     

Nano-formulation of 4-Hydroxy-3-methoxybenzohydrazide: Preparation,characterization and studies of antihyperglycemic and antioxidant activities as evaluated through amelioration of pancreatic Dysfunction in experimental animals

In the present work, nanoparticles of previously synthesized 3a derivatives of vanillic acid were synthesized by the nanoprecipitation method. Nanoparticles were further characterized by UV–vis spectroscopy, FTIR spectroscopy, SEM analysis, XRD and zeta sizer. Diabetes was instigated in Wistar albino rats by intraperitoneal (I.P.) administration of Streptozotocin (60 ?mg/kg body weight). Vanillic acid (100 ?mg/kg), 3a (100 ?mg/kg) and 3aNPs (50 ?mg/kg) body weight were given orally for a period of 21 days. Blood glucose level and biochemical parameters such as cholesterol, triglycerides, LDL, HDL, VLDL and antioxidant parameters were assessed by using diagnostic kits. SEM analysis and PDI of 3aNPs was found to be 0.2 which indicate monodisperse distribution. Significant decline in blood glucose level (p ?< ?0.001) was observed in antidiabetic studies along with the lipid lowering and antioxidant effect in dose-dependent manner. The noted results of the study showed that nanoparticles were found to be effective in treating diabetes.     

Homology modelling and virtual screening to explore potent inhibitors for MAP2K3 protein

Structural Chemistry - MAP2K3 protein is mitogen-activated protein kinase belonging to the family of kinases involved in intracellular cell proliferation. The mammalian MAPK family that consists of...     

A Solvent Switch for the Stabilization of Multiple Hemiacetals on an Inorganic Platform: Role of Supramolecular Interactions

Reaction of Zn(OAc)₂ ? 2 H₂O with 2,6‐diisopropylphenyl phosphate (dippH₂) in the presence of pyridine‐4‐carboxaldehyde (Py‐4‐CHO) in methanol resulted in the isolation of a tetrameric zinc phosphate cluster [Zn(dipp)(Py‐4‐CH(OH)(OMe))]₄ ? 4 MeOH ( 1 ) with four hemiacetal moieties stabilized on the double‐4‐ring inorganic cubane cluster. The change of solvent from methanol to acetonitrile leads to the formation of [Zn(dipp)(Py‐4‐CHO)]₄ ( 2 ), in which the coordinated Py‐4‐CHO retains its aldehydic form. Dissolution of 1 in CD₃CN readily converts it to the aldehydic form and yields 2 . Similarly 2 , which exists in the aldehyde form in CD₃CN, readily converts to the hemiacetal form in CD₃OD/CH₃OH. Compound 1 is an unprecedented example in which four hemiacetals have been stabilized on a single molecule in the solid state retaining its stability in solution as revealed by its ¹H NMR spectrum in CD₃OD. The solution stability of 1 and 2 has further been confirmed by ESI‐MS studies. To generalize the stabilization of multiple hemiacetals on a single double‐four‐ring platform, pyridine‐2‐carboxaldehyde (Py‐2‐CHO) was used as the auxiliary ligand in the reaction between zinc acetate and dippH₂, leading to isolation of [Zn(dipp)(Py‐2‐CH(OH)(OMe))]₄ ( 3 ). Understandably, recrystallization of 3 from acetonitrile yields the parent aldehydic form, [Zn(dipp)(Py‐2‐CHO)]₄ ( 4 ). Single‐crystal X‐ray diffraction studies reveal that supramolecular bonding, aided by hydrogen‐bonding interactions involving the hemiacetal functionalities (C?OH, C?OMe, and C?H), are responsible for the observed stabilization. The hemiacetal/aldehyde groups in 1 and 2 readily react with p‐toluidine, 2,6‐dimethylaniline, and 4‐bromoaniline to yield the corresponding tetra‐Schiff base ligands, [Zn(dipp)(L)]₄ (L=4‐methyl‐N‐(pyridin‐4‐ylmethylidene)aniline ( 5 ), 2,6‐dimethyl‐N‐(pyridin‐4‐ylmethylene)‐aniline ( 6 ), and 4‐bromo‐N‐(pyridin‐4‐ylmethylene)aniline ( 7 )). Isolation of 5 – 7 opens up further possibilities of using 1 and 2 as new supramolecular synthons and ligands.     

Pullback of Klingen Eisenstein series and certain critical L-values identities

The Ramanujan Journal - We obtain pullback formulas for Klingen Eisenstein series with arbitrary levels, with respect to both Siegel congruence and paramodular subgroups, in degree two. Pullback...