Thermal Stability and DPPC/Ca2+Interactions of Pulmonary Surfactant SP-A from Bulk-Phase and Monolayer IR Spectroscopy†

Biochemistry ◽  
2001 ◽  
Vol 40 (45) ◽  
pp. 13659-13669 ◽  
Author(s):  
Xiaohong Bi ◽  
Svetla Taneva ◽  
Kevin M. W. Keough ◽  
Richard Mendelsohn ◽  
Carol R. Flach
Keyword(s):  
Thermal Stability ◽  
Ir Spectroscopy ◽  
Pulmonary Surfactant ◽  
Bulk Phase

The Effect of Adhesive Additives on the Properties of Isoprene Rubber

2019 ◽  
Vol 816 ◽  
pp. 255-259 ◽  
Author(s):  
Nelly N. Shishkina ◽  
Larisa Yuryevna Zakirova ◽  
Ya.D. Samuilov
Keyword(s):  
Thermal Stability ◽  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Synthetic Rubber ◽  
Blocked Isocyanate ◽  
Isoprene Rubber

Blocked isocyanate – 2-isocyanate-phenylcarbamidemethylbenzene was synthesized and identified using IR-spectroscopy and elemental analysis researching methods. Research showed that adding 2-isocyanate-phenylcarbamidemethylbenzene in rubber compositions based on cis-isoprene synthetic rubber provides increased thermal stability and increasing adhesion comparing them to Manobond-680c.

scholarly journals Exploring the Complexation of Counterion in Novel Family of Polyelectrolytes with Unexpected Solubility Behaviour

2020 ◽  
Vol 869 ◽  
pp. 61-68
Author(s):  
Egor A. Bersenev ◽  
Alina Maryasevskaya ◽  
Evgenii V. Komov ◽  
Denis V. Anokhin ◽  
Dimitri A. Ivanov
Keyword(s):  
Thermal Stability ◽  
Ir Spectroscopy ◽  
Lithium Salt ◽  
Ionic Form ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alkali Ions ◽  
In Series ◽  
Chelating Complex ◽  
Thermal Stability Of

In the present paper we study the effect of complexation in linear negatively charged polyelectrolytes with different alkali ions. With combination of IR-spectroscopy, X-ray diffraction and nanocalorimetry, we attempted to explain unusual solubility, crystallinity and thermal stability of these polymers. The increase of thermal stability and insolubility in water in series of semi-crystalline polysalts as K+ ≤ H+ <Na+ was explained by effectiveness of formation of chelating complex. Insoluble in water sodium salt shows the highest thermal stability of crystal phase up to . In contrast, well soluble in water amorphous lithium salt does not self-organize in chelating complex and is presented in ionic form.

scholarly journals Synthesis, Characterization and Thermal Analysis of New Cu(II) Complexes with Hydrazide Ligands

2010 ◽  
Vol 7 (s1) ◽  
pp. S278-S282 ◽  
Author(s):  
Saber Rajaei ◽  
Shahriare Ghammamy ◽  
Kheyrollah Mehrani ◽  
Hajar Sahebalzamani
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Acetic Acid ◽  
Ir Spectroscopy ◽  
Coordination Mode ◽  
Azomethine Nitrogen ◽  
Excellent Thermal Stability ◽  
Spectral Techniques ◽  
Ft Ir ◽  
New Compounds

A number of new complexes have been synthesized by reaction of novel ligands acetic acid(4-methyl-benzylidene)hydrazide (L1) and acetic acid(naphthalen-1-ylmethylene)hydrazide (L2) with copper(II) nitrate. These new compounds were characterized by elemental analysis, TG, DTA, IR spectroscopy, UV spectral techniques. The changes observed between the FT-IR and UV-Vis spectra of the ligands and of the complexes allowed us to establish the coordination mode of the metal in complexes. The results suggest that the Schiff bases L1and L2coordinate as univalent anions with their bidentate N,O donors derived from the carbonyl and azomethine nitrogen. Also the probing of thermal analysis complexes can detect which complex has excellent thermal stability.

Thermal Stability of a-SiNx:H Films

1992 ◽  
Vol 284 ◽  
Author(s):  
V.Kh. Kudoyargva ◽  
A. A. Aivazov ◽  
B. G. Budaguan ◽  
I. V. Filatova
Keyword(s):  
Thermal Stability ◽  
Ir Spectroscopy ◽  
Nitrogen Doping ◽  
Effective Technique ◽  
Thermal Stability Of

ABSTRACTThe investigations of thermal stability of a-SiNx:H films (x≤0.4) have xbeen performed bv both IR spectroscopy and DTA techniques. The properties of samples with x≤0.06 were attentively considered because in this case the nitrogen may be treated as an impurity in a-Si:H. It has been shown that controlled nitrogen doping (up to 0.5 Pa NH3) can be used as an effective technique for thermostabilization of a-Si:H properties.

scholarly journals Honey bee odorant-binding protein 14: effects on thermal stability upon odorant binding revealed by FT-IR spectroscopy and CD measurements

2013 ◽  
Vol 43 (2-3) ◽  
pp. 105-112 ◽  
Author(s):  
Andreas Schwaighofer ◽  
Caroline Kotlowski ◽  
Can Araman ◽  
Nam Chu ◽  
Rosa Mastrogiacomo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ir Spectroscopy ◽  
Honey Bee ◽  
Binding Protein ◽  
Odorant Binding Protein ◽  
Ft Ir ◽  
Odorant Binding ◽  
Ft Ir Spectroscopy

High-Performance Polyesters: Synthesis, Characterization, and Properties of Poly(P-Oxybenzoate)

2020 ◽  
Vol 992 ◽  
pp. 380-385
Author(s):  
A.I. Akhmetshina ◽  
L.K. Karimova ◽  
R.Ya. Deberdeev
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Thermal Properties ◽  
Ir Spectroscopy ◽  
High Performance ◽  
The Other ◽  
Transesterification Method

Poly (p-oxybenzoate) samples were synthesized via the esterification and the transesterification reactions. The structure of the obtained target products was investigated by IR spectroscopy and has revealed that these substances were oligomers. The transesterification method has facilitated the synthesis of higher molecular weight grades of the polymer. This resulted in enhanced thermal properties of polyester synthesized by transesterification (up to 340 °C). The other specimen has performed thermal stability up to 320 °C.

scholarly journals Structural and thermal stability analysis of Escherichia coli and Alicyclobacillus acidocaldarius thioredoxin revealed a molten globule-like state in thermal denaturation pathway of the proteins: an infrared spectroscopic study

2003 ◽  
Vol 373 (3) ◽  
pp. 875-883 ◽  
Author(s):  
Emilia PEDONE ◽  
Simonetta BARTOLUCCI ◽  
Mosè ROSSI ◽  
Francesco Maria PIERFEDERICI ◽  
Andrea SCIRÈ ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Thermal Stability ◽  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Thermal Denaturation ◽  
Molten Globule ◽  
Fourier Transform Ir Spectroscopy ◽  
E Coli ◽  
Alicyclobacillus Acidocaldarius ◽  
Fourier Transform Ir

The structure of thioredoxin from Alicyclobacillus acidocaldarius (previously named Bacillus acidocaldarius) (BacTrx) and from Escherichia coli (E. coli Trx) was studied by Fourier-transform IR spectroscopy. Two mutants of BacTrx [Lys18→Gly (K18G) and Arg82→Glu (R82E)] were also analysed. The data revealed similar secondary structures in all proteins, but BacTrx and its mutants showed a more compact structure than E. coli Trx. In BacTrx and its mutants, the compactness was p2H-dependent. All proteins revealed the existence of a molten globule-like state. At p2H 5.8, the temperature at which this state was detected was higher in BacTrx and decreased in the different proteins in the following order: BacTrx>R82E>K18G>E. coli Trx. At neutral or basic p2H, the molten globule-like state was detected at the same temperature in both BacTrx and R82E, whereas it was found at the same temperature in all p2Hs tested for E. coli Trx. The thermal stability of the proteins was in the following order at all p2Hs tested: BacTrx>R82E>K18G>E. coli Trx, and was lower for each protein at p2H 8.4 than at neutral or acidic p2Hs. The formation of protein aggregates, brought about by thermal denaturation, were observed for BacTrx and K18G at all p2Hs tested, whereas they were present in R82E and E. coli Trx samples only at p2H 5.8. The results indicated that a single mutation might affect the structural properties of a protein, including its propensity to aggregate at high temperatures. The data also indicated a possible application of Fourier-transform IR spectroscopy for assessing molten globule-like states in small proteins.

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