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At least 415 records · Page 23Linked to original sources
PubMed1989

Helium-neon laser-induced respiratory burst of phagocytic cells.

The effect of He-Ne laser radiation (lambda = 632.8 nm, I = 6.8 W/m2, irradiation time from 5 to 50 sec) on kinetics of spontaneous and Candida ablicans-stimulated chemiluminescence of mouse spleen cells was studied. It was found that laser radiation caused significant enhancement (180-250%) both of spontaneous chemiluminescence and Candida-induced chemiluminescence. The effective dose interval ranges from 100 to 300 J/m2, with a maximum at 200 J/m2. This finding shows that He-Ne laser irradiation can induce the respiratory burst (generation of reactive oxygen species having bactericidal activity) of phagocytic cells.

Animals↗
PubMed1991

Frequency stabilisation of multimode helium-neon lasers in laser Doppler flowmetry.

Low-frequency noise in laser Doppler recordings can be generated because of thermal instabilities in the gas laser cavity. Mode partition noise can be eliminated by thermal stabilisation of the laser cavity. The paper describes a method for closed loop temperature control of the laser cavity. The method uses orthogonal properties of longitudinal laser modes for the temperature control. The signal-to-noise ratio is considerably improved by the procedure. It is recommended that all gas laser equipped Doppler instruments used for precision blood flow studies should be equipped with stabilised laser sources.

Electricity↗
PubMed2005

Posterior instrumentation of the cervical spine using the neon occipito-cervical system. Part 2: cervical and cervicothoracic instrumentation.

OBJECTIVE: Posterior cervical and cervicothoracic stabilization, if necessary, in combination with posterior spondylodesis, after closed or open reduction as well as with or without neural decompression as clinically indicated. INDICATIONS: Instabilities and deformities of rheumatoid, traumatic, neoplastic, infectious, iatrogenic or congenital origin. Multilevel cervical spinal stenosis with degenerative instability or kyphosis of the affected spinal segment. Corrective spondylodesis for posttraumatic or postinfectious kyphosis. CONTRAINDICATIONS: Infection in the operative field. Inability to undergo anesthesia. SURGICAL TECHNIQUE: Prone position, rigid head fixation, e. g., with Mayfield tongs. If appropriate, closed reduction under lateral image intensification. Midline posterior surgical approach at the level of the segment to be instrumented. If necessary, open reduction. Insertion of the cervical/upper thoracic screws. If necessary, posterior decompression. Instrumentation with prebent longitudinal rods. If a fusion is to be obtained, decortication of the posterior bone elements with a burr and onlay of cancellous bone. RESULTS: 44 patients, 13 women and 31 men, with an average age of 57 years were operated on between August 2000 and August 2003. All patients underwent a follow-up examination 4-39 months (average 15.7 months) after the initial surgery. Fusion was achieved in all patients who had undergone a posterior spondylodesis: no implant failure, no implant removal or reoperation. The preoperatively planned instrumentation could be implemented intraoperatively in all patients.

Bone Screws↗
PubMed2006

Rotational spectrum and inversion motions in the neon-dimethyl sulfide complex.

The rotational spectra of the (20)Ne and (22)Ne isotopomers of the Ne-dimethyl sulfide (DMS) rare gas dimer have been measured by Fourier transform microwave spectroscopy. MP2/6-311++G(2d,2p) calculations, and the experimental spectroscopic data, suggest a structure of C(s) symmetry in which the Ne atom lies above the heavy atom plane of the DMS (in the sigma(v) plane which bisects the CSC angle). Experimental rotational constants are consistent with a S...Ne distance of 3.943(6) Angstroms and a (cm...S...Ne) angle of 63.2(6) degrees (where cm is the center of mass of DMS). A motion of the Ne atom from one side of the DMS to the other gives rise to inversion splittings of around 3 MHz in the c-type transitions. An ab initio potential energy surface calculation has allowed examination of several possible tunneling pathways, and suggests a barrier of between 20 and 40 cm(-1) for the inversion motion, depending on the tunneling pathway taken by the Ne. Dipole moment measurements are consistent with both the experimental and ab initio structures.

Journal Article↗
PubMed2005

A practical treatment for the three-body interactions in the transcorrelated variational Monte Carlo method: application to atoms from lithium to neon.

We suggest a practical solution to dealing with the three-body interactions in the transcorrelated variational Monte Carlo method (TC-VMC). In the TC-VMC method, which was suggested in our previous paper [N. Umezawa and S. Tsuneyuki, J. Chem. Phys. 119, 10015 (2003)], the Jastrow-Slater-type wave function is efficiently optimized through a self-consistent procedure by minimizing the variance of the local energy. The three-body terms in the transcorrelated self-consistent-field equation, which have been simply ignored in our previous works, are efficiently calculated by the Monte Carlo numerical integration. We found that our treatment for the three-body interactions is successful for atoms from Li to Ne.

Journal Article↗
PubMed2006

Infrared absorptions of NH3(H2) complexes trapped in solid neon.

When a very small concentration of H2 is added to a Ne:NH3=800:1 sample and the resulting mixture is deposited at 4.3 K, a new absorption appears at 4151.1 cm(-1) which can be assigned to the H2 stretching fundamental of H2 (j=1) complexed with NH3. Other new absorptions which appear near the vibrational fundamentals of NH3 are assigned to the NH3 moiety in this complex and in the complex of NH3 with H2 (j=0). The results of experiments in which HD or D2 is added to the Ne:NH3 mixture support these assignments. Ab initio and density functional calculations predict the observed infrared activation of the H2-stretching vibration for a structure in which the axis of the H2 molecule is collinear with the threefold axis of the NH3. The dependence of the observed absorption patterns on the concentration of H2 in the sample indicates that complexes of NH3 with two or more H2 molecules also form readily.

Journal Article↗