Sandra Johnen

896 total citations
49 papers, 692 citations indexed

About

Sandra Johnen is a scholar working on Molecular Biology, Cellular and Molecular Neuroscience and Ophthalmology. According to data from OpenAlex, Sandra Johnen has authored 49 papers receiving a total of 692 indexed citations (citations by other indexed papers that have themselves been cited), including 36 papers in Molecular Biology, 16 papers in Cellular and Molecular Neuroscience and 15 papers in Ophthalmology. Recurrent topics in Sandra Johnen's work include Retinal Development and Disorders (32 papers), CRISPR and Genetic Engineering (13 papers) and Retinal Diseases and Treatments (12 papers). Sandra Johnen is often cited by papers focused on Retinal Development and Disorders (32 papers), CRISPR and Genetic Engineering (13 papers) and Retinal Diseases and Treatments (12 papers). Sandra Johnen collaborates with scholars based in Germany, Switzerland and France. Sandra Johnen's co-authors include Peter Walter, Gabriele Thumann, Zsuzsanna Izsvák, Zoltán Ivics, Frank Müller, Matthias Renner, Michael Hudecek, Christiane Pfarrer, Martina Kropp and Matthias Fuest and has published in prestigious journals such as PLoS ONE, Biomaterials and Scientific Reports.

In The Last Decade

Sandra Johnen

47 papers receiving 680 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Sandra Johnen Germany 15 422 203 183 147 141 49 692
Matthew Smart United Kingdom 11 826 2.0× 270 1.3× 194 1.1× 244 1.7× 70 0.5× 15 939
Birthe Dorgau United Kingdom 20 920 2.2× 297 1.5× 149 0.8× 383 2.6× 54 0.4× 33 1.1k
Ivan Fernandez‐Bueno Spain 17 395 0.9× 372 1.8× 372 2.0× 130 0.9× 35 0.2× 43 936
Michal Gropp Israel 13 799 1.9× 74 0.4× 61 0.3× 139 0.9× 208 1.5× 17 946
Kourous A. Rezai United States 17 623 1.5× 408 2.0× 286 1.6× 188 1.3× 55 0.4× 36 1.0k
Renee C. Ryals United States 19 1.4k 3.4× 335 1.7× 127 0.7× 187 1.3× 549 3.9× 36 1.7k
Enrique Salero United States 10 454 1.1× 124 0.6× 172 0.9× 107 0.7× 65 0.5× 18 637
Yu-Fan Chang Taiwan 14 253 0.6× 100 0.5× 84 0.5× 120 0.8× 27 0.2× 31 683
Ichiro Yamanaka Japan 14 443 1.0× 312 1.5× 281 1.5× 51 0.3× 76 0.5× 17 739
Darin Zerti United Kingdom 16 582 1.4× 267 1.3× 122 0.7× 214 1.5× 36 0.3× 22 786

Countries citing papers authored by Sandra Johnen

Since Specialization
Citations

This map shows the geographic impact of Sandra Johnen's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Sandra Johnen with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Sandra Johnen more than expected).

Fields of papers citing papers by Sandra Johnen

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Sandra Johnen. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Sandra Johnen. The network helps show where Sandra Johnen may publish in the future.

Co-authorship network of co-authors of Sandra Johnen

This figure shows the co-authorship network connecting the top 25 collaborators of Sandra Johnen. A scholar is included among the top collaborators of Sandra Johnen based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Sandra Johnen. Sandra Johnen is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
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Johnen, Sandra, Zsuzsanna Izsvák, Zoltán Ivics, et al.. (2023). Enhanced Biosafety of the Sleeping Beauty Transposon System by Using mRNA as Source of Transposase to Efficiently and Stably Transfect Retinal Pigment Epithelial Cells. Biomolecules. 13(4). 658–658. 2 indexed citations
4.
Johnen, Sandra, et al.. (2023). A workflow to visualize vertebrate eyes in 3D. PLoS ONE. 18(8). e0290420–e0290420.
5.
Roessler, Gernot, et al.. (2022). BioAdhere: tailor-made bioadhesives for epiretinal visual prostheses. Biomaterials Science. 10(12). 3282–3295. 8 indexed citations
6.
Walter, Peter, et al.. (2022). Effects of Hydrostatic Pressure on Electrical Retinal Activity in a Multielectrode Array-Based ex vivo Glaucoma Acute Model. Frontiers in Neuroscience. 16. 831392–831392. 3 indexed citations
7.
Johnen, Sandra, Corinne Marie, Daniel Scherman, et al.. (2021). Electroporation-Based Genetic Modification of Primary Human Pigment Epithelial Cells using the Sleeping Beauty Transposon System. Journal of Visualized Experiments. 3 indexed citations
8.
Kropp, Martina, et al.. (2021). Isolation, Culture, and Genetic Engineering of Mammalian Primary Pigment Epithelial Cells for Non-Viral Gene Therapy. Journal of Visualized Experiments. 2 indexed citations
9.
Denecke, Bernd, et al.. (2021). A multielectrode array‐based hypoxia model for the analysis of electrical activity in murine retinae. Journal of Neuroscience Research. 99(9). 2172–2187. 5 indexed citations
10.
Müller, Frank, et al.. (2019). Modulation of the electrical activity in degenerative retinas of rd10 mice using neuroprotective drugs. Investigative Ophthalmology & Visual Science. 60(9). 20–20. 1 indexed citations
11.
Hernández, María, Sergio Recalde, Laura García‐García, et al.. (2019). Preclinical Evaluation of a Cell-Based Gene Therapy Using the Sleeping Beauty Transposon System in Choroidal Neovascularization. Molecular Therapy — Methods & Clinical Development. 15. 403–417. 13 indexed citations
12.
Walter, Peter, Sabine Salla, Sandra Johnen, et al.. (2018). Cryopreservation of amniotic membrane with and without glycerol additive. Graefe s Archive for Clinical and Experimental Ophthalmology. 256(6). 1117–1126. 29 indexed citations
13.
Kropp, Martina, Gabriele Thumann, Jaap van den Berg, et al.. (2017). Development of GMP-compliant production of freshly isolated and transfected iris pigment epithelial (IPE) cells to treat age-related macular degeneration (AMD). 28(12). 2 indexed citations
14.
Johnen, Sandra, Martina Kropp, Peter Walter, et al.. (2017). The Antibiotic-free pFAR4 Vector Paired with the Sleeping Beauty Transposon System Mediates Efficient Transgene Delivery in Human Cells. Molecular Therapy — Nucleic Acids. 11. 57–67. 13 indexed citations
15.
Thumann, Gabriele, Corinne Marie, Attila Sebe, et al.. (2017). Engineering of PEDF-Expressing Primary Pigment Epithelial Cells by the SB Transposon System Delivered by pFAR4 Plasmids. Molecular Therapy — Nucleic Acids. 6. 302–314. 24 indexed citations
16.
Thumann, Gabriele, Zsuzsanna Izsvák, Zoltán Ivics, et al.. (2015). Transposon-Based, Targeted Ex Vivo Gene Therapy to Treat Age-Related Macular Degeneration (TargetAMD). PubMed. 26(2). 97–100. 1 indexed citations
17.
Johnen, Sandra, et al.. (2014). Correlations between ERG, OCT, and Anatomical Findings in therd10Mouse. Journal of Ophthalmology. 2014. 1–10. 35 indexed citations
18.
Djalali-Talab, Yassin, et al.. (2011). Gene Therapy of a CNV Rodent Model Using Non-virally Stably Transfected RPE Cells with the PEDF Gene. Investigative Ophthalmology & Visual Science. 52(14). 4380–4380. 1 indexed citations
19.
Johnen, Sandra, et al.. (2011). Sleeping Beauty-based Non-Viral Transfer of PEDF into Primary Pigment Epithelial Cells: A Method Yielding in High Transfection Efficiencies and Long Term Expression. Investigative Ophthalmology & Visual Science. 52(14). 4379–4379. 1 indexed citations
20.
Thumann, Gabriele, et al.. (2009). High efficiency non-viral transfection of retinal and iris pigment epithelial cells with pigment epithelium-derived factor. Gene Therapy. 17(2). 181–189. 17 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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