Skin Autofluorescence Fading at 405/532nm Laser Excitation

ABSTRACTWe use a new broadband spectroscopic technique to measure ultrafast changes in the dielectric function of a material over the spectral range 1.5–3.5 eV following intense 70-fs laser excitation. The results reveal the nature of the phase transformations which occur in the material following excitation. We studied the response of GaAs and Si. For GaAs, there are three distinct regimes of behavior as the pump fluence is increased — lattice heating, lattice disordering, and a semiconductor-to-metal transition.

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Nonlinear Optical Response of a WS2 Monolayer at Room Temperature upon Multicolor Laser Excitation

ACS Photonics ◽

10.1021/acsphotonics.0c01567 ◽

2021 ◽

Vol 8 (2) ◽

pp. 550-556

Author(s):

Javier Hernandez-Rueda ◽

Marc L. Noordam ◽

Irina Komen ◽

L. Kuipers

Keyword(s):

Nonlinear Optical ◽

Room Temperature ◽

Laser Excitation ◽

Optical Response ◽

Nonlinear Optical Response ◽

Ws2 Monolayer

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Skin autofluorescence predicts new cardiovascular disease and mortality in people with type 2 diabetes

BMC Endocrine Disorders ◽

10.1186/s12902-020-00676-4 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Henderikus E. Boersma ◽

Robert P. van Waateringe ◽

Melanie M. van der Klauw ◽

Reindert Graaff ◽

Andrew D. Paterson ◽

...

Keyword(s):

Blood Pressure ◽

Type 2 Diabetes ◽

Cardiovascular Disease ◽

Fasting Blood Glucose ◽

Multivariable Analysis ◽

Oral Glucose ◽

Skin Autofluorescence ◽

Z Score

Abstract Background Skin autofluorescence (SAF) is a non-invasive marker of tissue accumulation of advanced glycation endproducts (AGE). Recently, we demonstrated in the general population that elevated SAF levels predict the development of type 2 diabetes (T2D), cardiovascular disease (CVD) and mortality. We evaluated whether elevated SAF may predict the development of CVD and mortality in individuals with T2D. Methods We included 2349 people with T2D, available baseline SAF measurements (measured with the AGE reader) and follow-up data from the Lifelines Cohort Study. Of them, 2071 had no clinical CVD at baseline. 60% were already diagnosed with diabetes (median duration 5, IQR 2–9 years), while 40% were detected during the baseline examination by elevated fasting blood glucose ≥7.0 mmol/l) and/or HbA1c ≥6.5% (48 mmol/mol). Results Mean (±SD) age was 57 ± 12 yrs., BMI 30.2 ± 5.4 kg/m2. 11% of participants with known T2D were treated with diet, the others used oral glucose-lowering medication, with or without insulin; 6% was using insulin alone. Participants with known T2D had higher SAF than those with newly-detected T2D (SAF Z-score 0.56 ± 0.99 vs 0.34 ± 0.89 AU, p < 0.001), which reflects a longer duration of hyperglycaemia in the former group. Participants with existing CVD and T2D had the highest SAF Z-score: 0.78 ± 1.25 AU. During a median follow-up of 3.7 yrs., 195 (7.6%) developed an atherosclerotic CVD event, while 137 (5.4%) died. SAF was strongly associated with the combined outcome of a new CVD event or mortality (OR 2.59, 95% CI 2.10–3.20, p < 0.001), as well as incidence of CVD (OR 2.05, 95% CI 1.61–2.61, p < 0.001) and death (OR 2.98, 2.25–3.94, p < 0.001) as a single outcome. In multivariable analysis for the combined endpoint, SAF retained its significance when sex, systolic blood pressure, HbA1c, total cholesterol, eGFR, as well as antihypertensive and statin medication were included. In a similar multivariable model, SAF was independently associated with mortality as a single outcome, but not with incident CVD. Conclusions Measuring SAF can assist in prediction of incident cardiovascular disease and mortality in individuals with T2D. SAF showed a stronger association with future CVD events and mortality than cholesterol or blood pressure levels.

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