51
|
Petersen S, Ulrich J. Role of Emulsifiers in Emulsion Technology and Emulsion Crystallization. Chem Eng Technol 2013. [DOI: 10.1002/ceat.201200648] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
52
|
Wulf K, Petersen S, Schünemann S, Knödler S, Schmitz KP, Sternberg K. Development Of A Tunable Drug Delivery System From Biodegradable Scaffolds Via Layer By Layer Deposition. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-C/bmt-2013-4079/bmt-2013-4079.xml. [DOI: 10.1515/bmt-2013-4079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
53
|
Kaule S, Petersen S, Minrath I, Schmitz KP, Sternberg K. Establishment of an in vitro evaluation system for drug-coated ballons. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-C/bmt-2013-4083/bmt-2013-4083.xml. [DOI: 10.1515/bmt-2013-4083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
54
|
Minrath I, Petersen S, Schmitz KP, Sternberg K. Continuative Studies for Inserting Stimulus-Responsive Functions in Hydrogels for Local Drug Delivery. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-C/bmt-2013-4080/bmt-2013-4080.xml. [DOI: 10.1515/bmt-2013-4080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
55
|
Petersen S, Glock H, Specht O, Kuehl H, Heinitz W, Warkentin M, Behrend D. Dental Ultrasound Diagnostics – a Simulation Study. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-N/bmt-2013-4338/bmt-2013-4338.xml. [DOI: 10.1515/bmt-2013-4338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
56
|
Petersen S, Wulf K, Schünemann S, Teske M, Schmitz KP, Sternberg K. Biofunctionalization of Polymer Implant Surfaces: From Drug Delivery to Stable Surface Functionality. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-C/bmt-2013-4052/bmt-2013-4052.xml. [DOI: 10.1515/bmt-2013-4052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
57
|
Bandomir J, Schulz A, Taguchi S, Petersen S, Kragl U, Ohno H, Sternberg K. Poly-Ionic Liquids as New Hydrogel Materials: Synthesis, Characterization and Application. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-H/bmt-2013-4204/bmt-2013-4204.xml. [DOI: 10.1515/bmt-2013-4204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
58
|
Taylor U, Garrels W, Petersen S, Kues W, Lucas-Hahn A, Barcikowski S, Rath D. 149 UNIMPAIRED DEVELOPMENT OF MURINE EMBRYOS AFTER INJECTION OF SILVER NANOPARTICLES. Reprod Fertil Dev 2013. [DOI: 10.1071/rdv25n1ab149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Because of their antibacterial properties, silver nanoparticles (AgNP) are used abundantly in medical products such as wound dressing and catheters, but also in consumer items like clothing and lining of food containers. Despite such widespread exposure and the fact that they are considered toxic to eukaryotic cells as well, knowledge concerning their reprotoxic potential is very limited. Therefore, the aim of the present study was to investigate the effects of AgNP on embryo development. The used AgNP were produced by laser ablation in liquids, which provides particles of high purity and stability. In order to ensure direct contact of the particle with the developing organism, 10 pL of an AgNP-dispersion in water (250 µM Ag; average particle diameter 15 nm) was microinjected into one blastomere of a two-cell-stage embryo (n = 91), derived from superovulated NMRI-mice. As controls, embryos were injected with water only (n = 74) or left untreated as a handling control (n = 102). Subsequently, in vitro culture commenced for 72 hours at 37°C and 5% CO2 in KSOM plus 1% BSA. In order to distinguish whether possible effects are caused by the nanoparticles as such or by Ag+-ions released from the nanoparticles, additional embryos were co-incubated with silver nitrate (25 µM) during culture (n = 41). To exclude influence of the NO–-ions on the embryo development, potassium nitrate controls (25 µM) were run as well (n = 40). The obtained blastocyst rates were compared using one-way ANOVA and a chi-square test. Day 4 blastocysts derived from the injected groups and the handling control were used for a real-time PCR analysis, to investigate gene expression of developmentally important genes (Bax, Bcl2l2, and Tp53 for apoptosis; Oct4 and Nanog for stemness, Dnmt3a for methylation). Embryo development was assessed on a daily basis. In the injected embryos, no abnormal development was observed. After injection with silver nanoparticles, the development rate reached 61.5%, which did not differ from the water-injected embryos, where 66.2% of the embryos developed to blastocysts. The handling controls reached a significantly higher blastocyst rate of 79.4% compared to both injected groups (P < 0.05). Interestingly, gene expression remained unaltered regardless of whether embryos were injected with AgNP, water, or not injected at all. Exposure to Ag+-ions resulted in an immediate arrest of development, while co-incubation of embryos with KNO showed no effect, reaching a blastocyst rate of 80.0%. In conclusion, the results do not indicate any negative effect of intracytoplasmatic injection of silver nanoparticles on murine embryos. Since the presence of Ag+-ions was shown to have a tremendously detrimental effect on the development, the nanoparticles do not seem to release silver ions in amounts sufficient to disturb this delicate process. Further studies involving gametes and embryos of large animal models are ongoing to intensify our understanding of silver nanoparticle reprotoxicity.
Supported by DFG Grant SPP1313 and REBIRTH.
Collapse
|
59
|
Petersen S, Moodie M, Mavoa H, Faeamani G, Waqa G, Fotu K, Swinburn B. Health related quality of life impairment in children with overweight is highly context dependent. Obes Res Clin Pract 2012. [DOI: 10.1016/j.orcp.2012.08.081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
60
|
El Kinawy OS, Petersen S, Helmdach L, Ulrich J. Parameter Selection of Emulsification Processes: Conditions for Nano- and Macroemulsions. Chem Eng Technol 2012. [DOI: 10.1002/ceat.201100692] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
61
|
Malcolme-Lawes L, Juli C, Karim R, Bai W, Quest R, Lim PB, Jamil-Copley S, Kojodjojo P, Ariff B, Davies DW, Rueckert D, Hunter R, Boubertakh R, Petersen S, Schilling R, Kanagaratnam P, Peters NS. 050 Automated analysis of atrial delayed enhancement cardiac MRI correlates with voltage, AF recurrence post-ablation, and high stroke risk. BRITISH HEART JOURNAL 2012. [DOI: 10.1136/heartjnl-2012-301877b.50] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
62
|
Barchanski A, Hashimoto N, Petersen S, Sajti CL, Barcikowski S. Impact of spacer and strand length on oligonucleotide conjugation to the surface of ligand-free laser-generated gold nanoparticles. Bioconjug Chem 2012; 23:908-15. [PMID: 22475043 DOI: 10.1021/bc200462b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Gold nanoparticles conjugated to nucleic acids are widely used for biomedical targeting and sensing applications; however, little is known about the conjugation chemistry covering the impact of steric dimension and strand orientation of single-stranded oligonucleotides (ssO) on the conjugation process and binding efficiencies. In this context, we present an extensive investigation concerning the attachment of thiolated ssO to the surface of laser-generated gold nanoparticles, altering both strand length and binding orientation by the insertion of different spacer types at either the 3' or 5' ssO terminus. A significant reduction of conjugation efficiency of about 30-50% is determined for spacer-prolonged bionanoconjugates due to coiling effects of the flexible ssO strand on the particle surface which increases deflection angle of oligonucleotides and limits the number of biomolecules attached to the nanoparticles.
Collapse
|
63
|
El Kinawy OS, Petersen S, Ulrich J. Technological Aspects of Nanoemulsion Formation of Low-Fat Foods Enriched with Vitamin E by High-Pressure Homogenization. Chem Eng Technol 2012. [DOI: 10.1002/ceat.201100608] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
64
|
Vehse M, Gieseke M, Fiedler S, Petersen S, Irsig R, Senz V, Löbler M, Hustedt M, Kaierle S, Haferkamp H, Sternberg K, Schmitz KP, Lochbrunner S, Meiwes-Broer KH, Seitz H. Loading method for discrete drug depots on implant surfaces. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
65
|
Sternberg K, Petersen S, Grabow N, Luderer F, Bohl A, Reske T, Siewert S, Minrath I, Seidlitz A, Weitschies W, Schwabedissen HMZ, Kroemer HK, Schmitz KP. Implant-associated local drug delivery systems for different medical applications. ACTA ACUST UNITED AC 2012. [DOI: 10.1515/bmt-2012-4473] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
66
|
Petersen S, Kurtbay G, Boeck M, Kroemer HK, Schmitz KP, Schwabedissen HMZ, Sternberg K. Tailored design of implant surfaces by modification with elastin-like proteins. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
67
|
Petersen S, Ulrich J. Effectiveness of Polyoxyethylene Nonionic Emulsifiers in Emulsification Processes Using Disc Systems. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201100257] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
68
|
Petersen S, Emmertsen K, Borre M, Bentzen L, Lundby L, Hoyer M. 7028 POSTER Ano-Rectal Function in Patients With Prostate Cancer Following Radiotherapy or Radical Prostatectomy. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71979-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
69
|
Barchanski A, Taylor U, Klein S, Petersen S, Rath D, Barcikowski S. Golden Perspective: Application of Laser-Generated Gold Nanoparticle Conjugates in Reproductive Biology. Reprod Domest Anim 2011; 46 Suppl 3:42-52. [DOI: 10.1111/j.1439-0531.2011.01844.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
70
|
Petersen S, Doll D, Czymek R, Bruch HP, Kujath P. Analfisteln und -abszesse: Sinus pilonodalis, Fournier-Gangrän. ACTA ACUST UNITED AC 2011. [DOI: 10.1055/s-0030-1270958] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
71
|
Pertig D, Buchfink R, Petersen S, Stelzer T, Ulrich J. Inline Analyzing of Industrial Crystallization Processes by an Innovative Ultrasonic Probe Technique. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201000558] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
72
|
Iqbal J, Petersen S, Ulrich J. Emulsion Solidification: Influence of the Droplet Size of the Water-in-Oil Emulsion on the Generated Particle Size. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201000449] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
73
|
Petersen S. Higher Brain Functions. Recent Explorations of the Brain's Emergent Properties. Stephen P. Wise, Ed. Wiley-Interscience, New York, 1987. xxii, 382 pp., illus., + plates. $79.95. Wiley Series in Neurobiology. Science 2010; 239:1322. [PMID: 17833220 DOI: 10.1126/science.239.4845.1322] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
74
|
Petersen S, Taylor G, Rickinson A, Berditchevski F. 290 The role of tetraspanins in antigen presentation to CD4+ T cells via exosomes. EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)71094-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
75
|
Schuster A, Stelzer T, Petersen S, Ulrich J. Closed Crystalline Tubes as a Container System. Chem Eng Technol 2010. [DOI: 10.1002/ceat.200900618] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|