S
Steffen Hackbarth
Researcher at Humboldt University of Berlin
Publications - 66
Citations - 3258
Steffen Hackbarth is an academic researcher from Humboldt University of Berlin. The author has contributed to research in topics: Singlet oxygen & Photosensitizer. The author has an hindex of 26, co-authored 61 publications receiving 2959 citations. Previous affiliations of Steffen Hackbarth include Humboldt State University.
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Singlet Oxygen Quantum Yields of Different Photosensitizers in Polar Solvents and Micellar Solutions
TL;DR: In this paper, the single oxygen quantum yields of different phthalocyanines and tris(2,2″-bipyridyl)ruthenium(II) dichloride in dimethylformamide (DMF) or aqueous micellar solution of 0.1 M CTAC (cetyltrimethylammonium chloride).
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Long-Term Exposure to CdTe Quantum Dots Causes Functional Impairments in Live Cells
TL;DR: For the various CdTe QD samples, there was no dose-dependent correlation between cell viability and intracellular [Cd2+], implying that their cytotoxicity cannot be attributed solely to the toxic effect of free Cd2+.
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Skin penetration and cellular uptake of amorphous silica nanoparticles with variable size, surface functionalization, and colloidal stability.
Fiorenza Rancan,Qi Gao,Christina Graf,Stefan Troppens,Sabrina Hadam,Steffen Hackbarth,Cynthia Kembuan,Ulrike Blume-Peytavi,Eckart Rühl,Jürgen Lademann,Annika Vogt +10 more
TL;DR: Despite partial particle aggregation occurring after transfer in physiological media, particles were taken up by skin cells in a size-dependent manner, and functionalization of the particle surface with positively charged groups enhanced the in vitro cellular uptake.
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Investigation of Polylactic Acid (PLA) Nanoparticles as Drug Delivery Systems for Local Dermatotherapy
Fiorenza Rancan,Dimitrios Papakostas,Sabrina Hadam,Steffen Hackbarth,Thierry Delair,Charlotte Primard,Bernard Verrier,Wolfram Sterry,Ulrike Blume-Peytavi,Annika Vogt +9 more
TL;DR: Investigation of biodegradable poly-lactic acid (PLA) particles loaded with fluorescent dyes as carriers for transepidermal drug delivery suggests that particles based on PLA polymers may be ideal carriers for hair follicle and sebaceous gland targeting.
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Photogeneration of singlet oxygen by humic substances: comparison of humic substances of aquatic and terrestrial origin
Andrea Paul,Steffen Hackbarth,Rolf D. Vogt,Beate Röder,B. Kent Burnison,Christian E. W. Steinberg +5 more
TL;DR: A general trend towards higher PhiDelta in terrestrial HS was observed and the comparison of reverse osmosis isolates from surface waters collected during fall 1999 and spring 2000 from five Scandinavian sites yielded, in all cases, higher Phi delta for the spring samples.