Comparison of 5-aminolevulinic acid photodynamic therapy and red light for treatment of photoaging.

Objective: The aim of this pilot study was to compare the efficacy of ALA-PDT and red light alone in the treatment of photoaging.

Methods: A total of 14 adults with photoaging skin were recruited. ALA-PDT or red light alone was applied to the forearm extensor.

Successful treatment of refractory facial acne using repeat short-cycle ALA-PDT: Case study.

Acne vulgaris is a common dermatological disorder. Topical photodynamic therapy (PDT)-mediated with aminolevulinic acid (ALA) or methyl aminolevulinic acid (MAL) has been successfully used in the treatment of moderate to severe acne. The purpose of this case report is to highlight the feasibility of using a repeat weekly short-cycle ALA-PDT to treat severe facial acne lesions refractory to systemic retinoid and antibiotics.

[Experimental investigation of atmosphere and water vapor with laser induced breakdown spectroscopy].

The present article investigated the laser induced breakdown spectra of atmosphere molecules as background spectrum for the measurement of airborne particles. The authors detailedly analyzed the spectral lines of oxygen, nitrogen and hydrogen in the laser induced breakdown spectra of atmosphere molecules corresponding to the National Institute of Standards and Technology atomic spectroscopy database line data. In addition, the authors studied the intensity of emitted spectral lines induced by laser breakdown process at different time delays and signal integration width As a result, the authors obtained the conclusion that the intensity of signal depends on variations of delay time strongly, and with a delay time more than 7 micros the interference resulting from the presence of atmosphere molecule can be reduced effectively in the application of laser induced breakdown spectroscopy.