scholarly journals Luminescent Ir(iii)–Ln(iii) coordination polymers showing slow magnetization relaxation

2020 ◽  
Vol 7 (23) ◽  
pp. 4580-4592 ◽  
Author(s):  
Kun Fan ◽  
Song-Song Bao ◽  
Ran Huo ◽  
Xin-Da Huang ◽  
Yu-Jie Liu ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Single Chain ◽  
Double Chain ◽  
Magnetization Relaxation ◽  
Structural Types ◽  
Nir Luminescence

Two structural types of iridium(iii)–lanthanide(iii) coordination polymers, single-chain Ir2Ln and double-chain Ir4Ln2 (Ln = Gd, Dy, Er, and Yb), have been prepared. SMM behaviour and NIR luminescence were observed for the Ir–Er and Ir–Yb systems.

Slow Magnetization Relaxation in a 1-D Double-Chain Coordination Polymer Composed of {DyIII 4} Repeating Units

2013 ◽  
Vol 3 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Dimitris Alexandropoulos ◽  
Chaoran Li ◽  
Catherine Raptopoulou ◽  
Vassilis Psycharis ◽  
Wolfgang Wernsdorfer ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Double Chain ◽  
Magnetization Relaxation

VESICLE TO MICELLE TRANSITION DRIVEN BY SURFACE SOLID-FLUID TRANSITION

2002 ◽  
Vol 16 (01n02) ◽  
pp. 375-382 ◽  
Author(s):  
JANAKY NARAYANAN ◽  
E. MENDES ◽  
C. MANOHAR
Keyword(s):  
Small Angle ◽  
Fluorescence Anisotropy ◽  
Small Angle Neutron Scattering ◽  
Unique Feature ◽  
Ion Pair ◽  
Single Chain ◽  
Double Chain ◽  
Micellar Phase ◽  
Curvature Energy ◽  
Oppositely Charged

This paper reviews the solution behavior of cetyltrimethylammonium hydroxynaphthalene carboxylate (CTAHNC), which has the unique feature of undergoing a transition from vesicle to worm-like micellar phase in three different ways, namely, increase in temperature, addition of a surfactant and on shearing. Fluorescence anisotropy, NMR, rheology, small angle neutron scattering studies etc gave evidence of the vesicle-micelle transition. CTAHNC can be looked upon as a complex formed by two oppositely charged surfactants (CTA+ and HNC-). This ion pair effectively acts as a double-chain lipid and has a tendency to form vesicles. On increasing the temperature, and/or adding single chain surfactants of shearing, the complex dissociates which changes the curvature energy of the surface. This leads to a 'surface melting' that brings forth the vesicle-micelle transition.

scholarly journals Human tumour cathepsin B. Comparison with normal liver cathepsin B

1992 ◽  
Vol 285 (2) ◽  
pp. 427-434 ◽  
Author(s):  
K Moin ◽  
N A Day ◽  
M Sameni ◽  
S Hasnain ◽  
T Hirama ◽  
...  
Keyword(s):  
Cathepsin B ◽  
Human Liver ◽  
Normal Liver ◽  
Polyacrylamide Gels ◽  
Single Chain ◽  
Human Tumour ◽  
Double Chain ◽  
Normal Human Liver ◽  
Human Cathepsin ◽  
Chain Form

Cathepsin B was purified from normal human liver and several human tumour tissues and partially characterized. Three forms of cathepsin B, with molecular masses of 25 kDa, 26 kDa (the two appearing as a doublet) and 30 kDa, were detected in SDS/polyacrylamide gels. The 25-26 kDa doublet was associated with the fractions from tumours and normal liver containing the highest cathepsin B activity. Cathepsin B from both sources showed similar pH optima. Both normal liver and tumour cathepsin B exhibited similar kinetics against selected synthetic substrates. At neutral pH and 24 degrees C, cathepsin B from both normal liver and tumour exhibited a lower Km and a higher kcat./Km than at pH 6.0. Their inhibitory profiles against synthetic inhibitors were also similar. Immunological studies with a monospecific antibody against the mature double-chain form of human liver cathepsin B and an antibody against a cathepsin B-derived synthetic peptide established the immunological similarity of liver and tumour enzymes. The N-terminal sequences of the 25 kDa and 26 kDa forms were identical with that of the heavy chain of the mature double-chain form of human cathepsin B, whereas the N-terminal sequence of the 30 kDa species was identical with that of the single-chain form of human cathepsin B. Treatment of the double-chain form of cathepsin B from normal liver and tumours with the endoglycosidase peptide-N4-(N-acetyl-beta-glucosaminyl)asparagine amidase converted the 26 kDa form into 25 kDa in SDS/polyacrylamide gels, suggesting that cathepsin B may exist as both glycosylated and unglycosylated forms. Our results, in contrast with those reported earlier for mouse cathepsin B, indicate that human liver and tumour cathepsin B are similar.

Purification of bovine cathepsin B: proteomic characterization of the different forms and production of specific antibodies

2003 ◽  
Vol 81 (4) ◽  
pp. 317-326 ◽  
Author(s):  
M A Sentandreu ◽  
L Aubry ◽  
A Ouali
Keyword(s):  
Cathepsin B ◽  
Sodium Dodecyl ◽  
Anion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Peptide Sequence ◽  
Size Exclusion ◽  
Single Chain ◽  
Double Chain ◽  
Bovine Kidney ◽  
Chain Form

Cathepsin B (EC 3.4.22.1) has been highly purified (14 225 fold) from bovine kidney by a rapid procedure that included the preparation of an enriched lysosomal extract, a selective fractionation with ammonium sulphate, size-exclusion chromatography, two cation-exchange chromatographies, and anion-exchange chromatography on diethylaminoethyl–Sephacel. After the last purification step, two hydrolytic peaks against Z-Phe-Arg-AMC were separated from each other, a minor peak corresponding to the cathepsin B single-chain form and a major one representing the double-chain form of cathepsin B. The single-chain form showed a molecular mass of 31 kDa on sodium dodecyl sulphate – polyacrylamide gel electrphoresis (PAGE) under reducing conditions, whereas the heavy chain of the double-chain form appeared as a doublet with molecular masses of 23.4 and 25 kDa, respectively. The identity of the different cathepsin B isoforms and the quality of the final enzyme preparation were confirmed by using two types of antibodies, one against a synthetic peptide sequence and one against purified cathepsin B. The proteomic study confirmed the identity of the different SDS–PAGE protein bands as cathepsin B isoforms and allowed the comparison and study of some structural differences between them at the level of their primary structures.Key words: cathepsin B, bovine kidney, MALDI-TOF, cathepsin B isoforms, antibodies.

NIR luminescence of one-dimensional tartaric acid derivatives neodymium coordination polymers

2016 ◽  
Vol 221 ◽  
pp. 319-325 ◽  
Author(s):  
Wan-Ying Niu ◽  
Chang Feng ◽  
Nai-ying Fan ◽  
Xin-Yu Wang ◽  
Peng-Fei Yan ◽  
...  
Keyword(s):  
Tartaric Acid ◽  
Coordination Polymers ◽  
One Dimensional ◽  
Tartaric Acid Derivatives ◽  
Nir Luminescence
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