In the past K. Kaya has collaborated on articles with K. Fuke and S. Nakajima. One of their most recent publications is Resonance Raman spectra of the halogenomethanes excited by ultraviolet nitrogen pulsed laser. Which was published in journal Chemical Physics Letters.

More information about K. Kaya research including statistics on their citations can be found on their Copernicus Academic profile page.

K. Kaya's Articles: (8)

Resonance Raman spectra of the halogenomethanes excited by ultraviolet nitrogen pulsed laser

AbstractThe Raman spectra of liquid CCl4, CHCl3, CH2Cl2, CHBr3 and CH2Br2 excited with 6328 Å He-Ne laser and 3371 Å nitrogen pulsed laser were measured. A remarkable resonance effect was found for the Raman lines of the antisymmetric C-X stretching vibrations. The results obtained were discussed in relation to the excited electronic states.

Electronic absorption spectra of phenol dimer and toluene—cyanobenzene complex as studied by mass-selected MPI—nozzle beam method

AbstractS0–S0 absorption spectra of phenol dimer and toluene-cyanobenzene complex in a supersonic free jet have been observed by the use of the multiphoton ionization technique. Two low-frequency vibrations at 15 and 112 cm-1 appear in the spectrum of phenol dimer, which were assigned as the bending and stretching mode of hydrogen bonding, respectively. Toluene—cyanobenzene complex also exhibits a low-frequency vibrational progression which indicates the dissociation of the complex in the S1 state.

Protection of endogenous enkephalin degradation from peptidases in human serum by actinonin

AbstractThis paper describes a new method for detecting the endogenous enkephalin level in human serum without interference from serum peptidases and contaminating proteins. The method consists of a combination of addition of a peptidase inhibitor, actinonin to serum and dialysis. The activity of enkephalin degrading enzymes was completely abolished by actinonin. Furthermore, contaminating proteins which interfered with RIA assay of enkephalins were removed by the dialysis process. This combination process enabled precise detection of the concentration of enkephalin-like substances in human serum. The mean normal serum level of leucine-enkephalin assayed by this method in 12 healthy volunteers was 93.4 pg/ml.

Raman spectra and Jahn-teller effects of C4O2-4 and C5O2-5 ions

AbstractThe Raman spectra of highly symmetrical ions C4O2-4 (D4h) and C5O2-5 (D5h) have been measured at various excitation wavelengths. The spectra are characterized by strong Raman intensities of some non-totally symmetric vibrations at off-resonant condition and their remarkable intensity enhancement at near and rigorous resonant conditions. The characteristic features of the Raman spectra are closely related with the Jahn-Teller effects of the lowest degenerate π,π* electronic excited states of these ions.

A numerical investigation on aerodynamic characteristics of an air-cushion vehicle

Highlights•Internal and external flows inside and around an air-cushion vehicle (ACV) have been studied.•Lift and drag coefficients as well as a qualitative description of the flow field are presented.•Aerodynamic characteristics of an ACV are compared with those of a road vehicle (car).•Wake structures of an ACV and that of a land vehicle exhibit significant differences.•Factors affecting lift and drag are discussed in detail.

Analytical MethodsUse of modified wheat bran for the removal of chromium(VI) from aqueous solutions

Highlights•Modification of wheat bran with tartaric acid M-WB was realized.•The number of functional groups on the increased with modification.•Modified M-WB is an efficient adsorbent for eliminating Cr(VI) from aqueous solution.•The sorption yield reached maximum value as 90% at pH 2.2 for Cr(VI) ions.•The sorption capacity of (M-WB) was 5.28 mg/g.

Geometric and electronic structure of binary clusters containing silicon atoms

AbstractBinary clusters containing silicon atoms such as SinNam, SinCm and SinF were produced in a molecular beam using laser vaporization. The reactivity of SinNam toward NO adsorption was found to have an anti-correlation with the ionization energy of SinNam. The results of ab-initio calculation indicate that on doping with a sodium atom, the electron charge migrates from the sodium atom to the silicon cluster without disturbing seriously the original framework of the silicon cluster. Photoelectron spectroscopy of silicon-sodium cluster anions was conducted using a magnetic bottle type photoelectron spectrometer. The determined electron affinity of SinNa was also found to have clear parallelism with the ionization energy of Sin clusters. This also confirms that the parentage of the singly occupied molecular orbital (SOMO) of SinNa is the lowest unoccupied molecular orbital (LUMO) of Sin. In the case of SinF, the electron migrates from the silicon cluster to the fluorine atom, which is reflected clearly in the photoelectron spectra of SinF−1 clusters. The similarity of the photoelectron spectra of Sin − 1C− and Sin− was attributed to the similarity of their geometric structure (3 ≤ n ≤ 6). In contrast to this, Cn − 1Si− and C− exhibit different photoelectron spectra, indicating the structural difference.

Original articlePulmonary microvascular injury following general anaesthesia with volatile anaesthetics — halothane and isoflurane: a comparative clinical and experimental study

AbstractPulmonary microvascular injury has become a recently studied phenomenon that may be responsible for most of the complications associated with the lungs. Thirty patients undergoing partial hemilaminectomy or discectomy due to hernia of nucleus pulposus underwent Tc-99m HMPAO lung clearance as well as Tc-99m pertechnetate lung scintigraphy pre-operatively, and following general anaesthesia with halothane and isoflurane (third, fourth and tenth post-operative days). The results were compared with conventional techniques and haemodynamic parameters during the peri-operative period. In order to demonstrate acute phase changes under general anaesthesia and to perform pathological examinations, 21 New Zealand rabbits underwent radionuclide studies with Tc-99m HMPAO or Tc-99m pertechnetate. Lung biopsies were also performed. Despite no significant differences in any of the conventional diagnostic techniques, Tc-99m pertechnetate lung scintigraphy was performed for both the halothane and isoflurane groups, and Tc-99m HMPAO lung clearance was performed for the isoflurane group preor post-operatively. Tc-99m HMPAO lung clearance was impaired significantly in the halothane group on the third post-operative day (half time: 6·4 ± 1·6 pre-operative and 13·76 ± 3·3 s, P<0·001) decreasing to pre-operative levels on the tenth post-operative day. Acute phase exposure to halothane was characterized with extremely abnormal Tc-99m HMPAO lung clearance in rabbits with respect to isoflurane, diminishing to control levels on the third day (half time: 8·7 ± 86 control and 28·65 ± 4·6, P<0·001). Pathological examinations also demonstrated endothelial damage on acute exposure in the halothane group.General anaesthesia with halothane may give rise to alveolar microvascular injury, which generally seems to be underdiagnosed and may lead to serious post-operative complications

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