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71.
Fluorescence spectroscopic studies on binding of a flavonoid antioxidant quercetin to serum albumins
Beena Mishra Atanu Barik K. Indira Priyadarsini Hari Mohan 《Journal of Chemical Sciences》2005,117(6):641-647
Binding of quercetin to human serum albumin (HSA) was studied and the binding constant measured by following the red-shifted
absorption spectrum of quercetin in the presence of HSA and the quenching of the intrinsic protein fluorescence in the presence
of different concentrations of quercetin. Fluorescence lifetime measurements of HSA showed decrease in the average lifetimes
indicating binding at a location, near the tryptophan moiety, and the possibility of fluorescence energy transfer between
excited tryptophan and quercetin. Critical transfer distance (R
o
) was determined, from which the mean distance between tryptophan-214 in HSA and quercetin was calculated. The above studies
were also carried out with bovine serum albumin (BSA). 相似文献
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73.
Nayak S Nayek HP Dehnen S Powell AK Reedijk J 《Dalton transactions (Cambridge, England : 2003)》2011,40(12):2699-2702
Two new polynuclear heterometallic cluster complexes with [Mn(III)(3)M(II)Na] (M = Mn, Ca) core were synthesized using two in situ formed Schiff bases. The compounds were structurally characterized by single crystal X-ray analysis. The compound with [Mn(III)Ca(II)Na] appeared to catalyse water oxidation which was followed by using Clark electrode and online mass spectrometry. 相似文献
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75.
Schiff base supported mononuclear organotin(IV) complexes: Syntheses,structures and fluorescence cell imaging
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Richa Vinayak Dhritiman Dey Dipanjan Ghosh Dhrubajyoti Chattopadhyay Abhrajyoti Ghosh Hari Pada Nayek 《应用有机金属化学》2018,32(3)
Three mononuclear organotin(IV) complexes supported by Schiff bases have been synthesized. The complexes [(C6H5)2Sn(L)] ( 1 ), [(t‐Bu)2Sn(L)] ( 2 ) and [(t‐Bu)2Sn(L')] ( 3 ) (L, L' = deprotonated Schiff bases) were obtained in good yield by the reaction of Schiff bases H 2 L or H 2 L′ with corresponding diorganotin dichlorides respectively. All newly synthesized complexes were characterized by means of FT‐IR spectroscopy, elemental analysis and multinuclear (1H, 13C and 119Sn) NMR spectroscopy. In addition, single crystal X‐ray diffraction analyses were employed to establish the solid state molecular structures of these complexes. The structures of 1 – 3 reveal that all complexes are mononuclear with a five‐coordinated tin(IV) centre in it. The absorption and emission properties of all complexes have been investigated. Moreover, cytotoxicity and fluorescence cell imaging studies of theses complexes have been performed. 相似文献
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78.
The length scale criteria is widely accepted as an explanation for transition and hence existence of different shock wave
reflection configurations in pseudo-steady flows. However, there has not been any attempt to validate this criteria using
information obtained from a time-dependent numerical simulation. A high resolution time-dependent numerical simulation in
pseudo-steady flow is carried out in the present work. Time-dependent numerical data is used to calculate flow features in
a laboratory frame of reference to verify validity of the length scale criteria for existence of different shock wave reflection
configurations in pseudo-steady flow. This analysis is then extended to the study of unsteady shock wave reflection configurations
in shock–vortex interactions. It is shown that the existence of regular reflection (RR) and Mach reflection (MR) configurations
in an unsteady flowfield resulting from shock–vortex interactions can also be explained locally based on limiting conditions
similar to that prescribed by the length scale criteria for pseudo-steady flow.
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79.
80.
Sachindranath Paul Anil Kumar Barik Ray J. Butcher Susanta Kumar Kar 《Polyhedron》2000,19(28):2661-2666
Nickel(II) complexes of the tripodal ligand (MPz3tren) of the general formula [Ni(MPz3tren)]X2·nH2O (X=Cl, Br, NO3, ClO4 and BF4; n=0 for Cl and Br; n=0.5 for NO3, ClO4 and BF4) have been prepared by template methodology and characterised by elemental analyses, magnetic susceptibility and conductivity measurements at RT, IR and electronic spectra. The molar conductivities measured in MeOH for all the complexes show them to be 1:2 electrolytes. The hexadentate character of the ligand in all the complexes is inferred from IR spectral studies. The electronic spectra in solid state and in MeOH solution suggest octahedral geometry for all the complexes. The structure of [Ni(MPz3tren)](BF4)2·0.5H2O has been determined by single-crystal X-ray diffraction studies (monoclinic, c2/c). Nickel(II) is in a trigonal antiprismatic N6 donor environment and the crystal structure is stabilised by a network of strong H-bonding. 相似文献