摘要:

Two peptides, H-Gly-Lys-Thr-Gly-Pro-Gly-OH (1) and Leu-enkephalin (2) FAB-PI spectra in normal and deuterated glycerol have been studied. Two C-deuterated and D2O exchanged analogs have been used to compare their fragmentation to unlabelled peptides.

ISSN:0038-7010    

DOI:10.1080/00387018608069264

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The13C nmr assignments for the antimalarial drugs chloroquine, 4-methyl primaquine, 5-methoxy-4-methylprimaquine and 5-methoxyprimaquine were established. These assignments were based on comparison with those of primaquine, proton-coupled data, and selective long-range proton decoupling.

ISSN:0038-7010    

DOI:10.1080/00387018608069265

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

In this paper we study the behavior of the errors involved in the determination of the parameters characterizing two spectral lines with Gaussian profile by means of the measurement of the intensity correlation function g(2)(τ) and by a multichannel system. The results obtained with both methods are compared. We also compare this results with those obtained when two lines with Lorentzian profile are analyzed.

ISSN:0038-7010    

DOI:10.1080/00387018608069266

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The 60 MHz1H NMR spectra of racemic vinclozolin,1, have been studied at 28° in CDC13solution with the chiral reagent tris[3-(heptafluoropropylhydroxymethylene)-d-camphorato]europium(III),2, by incremental additions of (6,6,7,7,8,8,8-heptafluoro-2,2-di-methyl-3,5-octanedionato)silver(I),3.Although the solution of1with2displayed substantial downfield lanthanide-induced shifts, Δδ, and enantiomeric shift differences, ΔΔδ, for selected nuclei, relative to the spectrum of unshifted1, additions of3to the solution of1and2were unexpectedly found to dramatically reduce the magnitudes of both Δδ and ΔΔδ.

ISSN:0038-7010    

DOI:10.1080/00387018608069267

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Absorption spectrum of NbN has been obtained in the 560–670 nm region by intracavity laser spectroscopy. Vibrational and rotational analyses of3-3Δ transition has been caried out. Molecular constants for the upper (3) and ground (3Δ) states have been determined.

ISSN:0038-7010    

DOI:10.1080/00387018608069268

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Infrared spectra were obtained for 2-methylhexane and 3-methylhexane, and were interpreted with the aid of normal coordinate calculations. It was shown that 2-methylhexane exists in three conformations. Evidence for the presence of three conformations of 3-methylhexane is presented, but a fourth conformer probably exists. Transferred force constant values resulted in an overall average difference between observed and calculated wavenumbers of 4.3 cm−1, or 0.5%, for seven conformers of these two compounds.

ISSN:0038-7010    

DOI:10.1080/00387018608069269

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A normal coordinates analysis for the M(NH3)2+4complex ions in Tdsymmetry (M = Zn, Cd, Co) and in D4hsymmetry (M = Cu, Pd, Pt) has been undertaken on the basis of a General Valence Force Field (GVFF), using simplified molecular models. Throughout the course of the present work, we have relaxed the point mass approximation for the NH3-ligands in order to investigate, on a quantitative basis, some relevant ligand - framework coupling vibrations. The simplest molecular model able to accomplish this purpose is to treat the ammino group, in a linear ligator approximation. We show that these model calculations provide a satisfactory set of vibrational frequencies as well as consistent sets of force constants.

ISSN:0038-7010    

DOI:10.1080/00387018608069270

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The reagent 1-(2-quinolylazo)-2,4,5-trihydroxybenzene (QATB) has been used for developing a method for the spectrophotometric determination of nickel (II) and lead (II). Variables influencing the sensitivity of this method such as wavelength, pH and time have been investigated. The limitations of this method and the effect of interfering ions have also been investigated. Few properties of the complexes formed between QATB and metal ions (Ni and Pb) such as composition, stability and free energy of formation have been determined.

ISSN:0038-7010    

DOI:10.1080/00387018608069271

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

We have measured the depolarization ratio and polarized intensities of the oxidation marker A1g-Raman line at 1363 cm−1and 1375 cm−1in ferri- and ferrocytochrome c respectively. From these data we derive symmetry classified distortions of the heme group from its ideal D4h-symmetry. In ferrocytochrome c these distortions are independent of the pH-value of the solution, indicating that the heme environment is stable with respect to pH. In ferricytochrome c we observe pH-dependent changes of the distortions, indicating the well known conformational change with pK = 9.05, where the methionine 80 ligand is replaced by lysine-79. The data indicate that in this conformation due to opening of the heme crevice the heme group has a higher effective symmetry.

ISSN:0038-7010    

DOI:10.1080/00387018608069272

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0038-7010    

DOI:10.1080/00387018608069273

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor