Laser-SNMS investigations on pyrene using Ga+, Bi1+, Bi3+and Bi5+as primary ions and different laser wavelengths and laser power densities for photoionization

2012 ◽  
Vol 45 (1) ◽  
pp. 31-34 ◽  
Author(s):  
S. Galla ◽  
A. Pelster ◽  
F. Draude ◽  
H. F. Arlinghaus
Keyword(s):  
Laser Power ◽  
Primary Ions ◽  
Power Densities

Reduced Absorption of Light at High Laser Power Densities

Nature ◽  
1965 ◽  
Vol 207 (4995) ◽  
pp. 399-400 ◽  
Author(s):  
HUBERTUS STAERK ◽  
GEORG CZERLINSKI
Keyword(s):  
Laser Power ◽  
High Laser Power ◽  
High Laser ◽  
Absorption Of Light ◽  
Power Densities

Waterborne Pathogen Detection Using Raman Spectroscopy

2008 ◽  
Vol 62 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Ashish Tripathi ◽  
Rabih E. Jabbour ◽  
Patrick J. Treado ◽  
Jason H. Neiss ◽  
Matthew P. Nelson ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Laser Power ◽  
Pathogen Detection ◽  
Species Level ◽  
Gram Positive ◽  
Gram Negative ◽  
Waterborne Pathogen ◽  
Water Matrix ◽  
The Impact ◽  
Power Densities

Raman spectroscopy is being evaluated as a candidate technology for waterborne pathogen detection. We have investigated the impact of key experimental and background interference parameters on the bacterial species level identification performance of Raman detection. These parameters include laser-induced photodamage threshold, composition of water matrix, and organism aging in water. The laser-induced photodamage may be minimized by operating a 532 nm continuous wave laser excitation at laser power densities below 2300 W/cm2 for Gram-positive Bacillus atrophaeus (formerly Bacillus globigii, BG) vegetative cells, 2800 W/cm2 for BG spores, and 3500 W/cm2 for Gram-negative E. coli (EC) organisms. In general, Bacillus spore microorganism preparations may be irradiated with higher laser power densities than the equivalent Bacillus vegetative preparations. In order to evaluate the impact of background interference and organism aging, we selected a biomaterials set comprising Gram-positive (anthrax simulants) organisms, Gram-negative (plague simulant) organisms, and proteins (toxin simulants) and constructed a Raman signature classifier that identifies at the species level. Subsequently, we evaluated the impact of tap water and storage time in water (aging) on the classifier performance when characterizing B. thuringiensis spores, BG spores, and EC cell preparations. In general, the measured Raman signatures of biological organisms exhibited minimal spectral variability with respect to the age of a resting suspension and water matrix composition. The observed signature variability did not substantially degrade discrimination performance at the genus and species levels. In addition, Raman chemical imaging spectroscopy was used to distinguish a mixture of BG spores and EC cells at the single cell level.

Investigation of a laser-plasma source of soft x rays operating at laser power densities 5×1011–2×1014W/cm2

1982 ◽  
Vol 12 (8) ◽  
pp. 977-980 ◽  
Author(s):  
N G Basov ◽  
Yu A Bykovskiĭ ◽  
Aleksandr V Vinogradov ◽  
A A Galichiĭ ◽  
M P Kalashnikov ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Laser Power ◽  
Plasma Source ◽  
X Rays ◽  
Power Densities

scholarly journals Gold Nanorod-Mediated Photothermal Modulation for Localized Ablation of Cancer Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Yoochan Hong ◽  
Eugene Lee ◽  
Jihye Choi ◽  
Seung Jae Oh ◽  
Seungjoo Haam ◽  
...  
Keyword(s):  
Cancer Cells ◽  
Laser Power ◽  
Near Infrared ◽  
Gold Nanorod ◽  
Photothermal Effect ◽  
Transduction Efficiency ◽  
Dead Cell ◽  
Photothermal Ablation ◽  
Power Densities ◽  
Nir Laser

We estimated the photothermal transduction efficiency of gold nanorod (GNR) solutions for different GNR concentrations and irradiation laser power. In particular, we verified that the degree of cell death area could be modulated by GNR concentration and irradiation laser power. The efficacy of GNR-produced photothermal ablation of cancer cells was evaluated by irradiating GNRs in the presence of MDA-MB-231 breast cancer cells with a near-infrared (NIR) laser at different laser power densities and irradiation times. GNR-induced photothermal ablation was applied successfully to cancer cells at various NIR laser power densities and irradiation times and was characterized with live-dead cell staining. Through these techniques, we established the system for not only verification of induced photothermal effect using NIR laser and thermocouple, but also identification of uptake efficiency for GNRs and cell viability using dark field and fluorescence imaging, respectively.

Effect of different laser power densities on photobiomodulation of L929 cell line

2017 ◽  
Author(s):  
İpek Düzgören ◽  
Mustafa Kemal Ruhi ◽  
Murat Gülsoy
Keyword(s):  
Cell Line ◽  
Laser Power ◽  
L929 Cell ◽  
Power Densities ◽  
L929 Cell Line

Generation of multiply charged ions at low and high laser-power densities

2003 ◽  
Vol 45 (5) ◽  
pp. 585-599 ◽  
Author(s):  
L L ska ◽  
K Jungwirth ◽  
B Kr likov  ◽  
J Kr sa ◽  
M Pfeifer ◽  
...  
Keyword(s):  
Laser Power ◽  
Multiply Charged Ions ◽  
Multiply Charged ◽  
High Laser Power ◽  
High Laser ◽  
Power Densities ◽  
Charged Ions

scholarly journals Effects of photobiomodulation therapy with various laser power densities on wound healing

2019 ◽  
Vol 1151 ◽  
pp. 012011
Author(s):  
Daing Hanum Farhana Abdul Munap ◽  
Pik Suan Lau ◽  
Noriah Bidin ◽  
Hazri Bakhtiar ◽  
Ganesan Krishnan
Keyword(s):  
Wound Healing ◽  
Laser Power ◽  
Photobiomodulation Therapy ◽  
Power Densities
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