Karl Poralla

5.7k total citations · 1 hit paper
85 papers, 4.6k citations indexed

About

Karl Poralla is a scholar working on Molecular Biology, Biochemistry and Spectroscopy. According to data from OpenAlex, Karl Poralla has authored 85 papers receiving a total of 4.6k indexed citations (citations by other indexed papers that have themselves been cited), including 70 papers in Molecular Biology, 15 papers in Biochemistry and 14 papers in Spectroscopy. Recurrent topics in Karl Poralla's work include Plant biochemistry and biosynthesis (29 papers), Microbial Metabolic Engineering and Bioproduction (15 papers) and Enzyme Catalysis and Immobilization (14 papers). Karl Poralla is often cited by papers focused on Plant biochemistry and biosynthesis (29 papers), Microbial Metabolic Engineering and Bioproduction (15 papers) and Enzyme Catalysis and Immobilization (14 papers). Karl Poralla collaborates with scholars based in Germany, United States and France. Karl Poralla's co-authors include Elmar L. Kannenberg, Michel Rohmer, Guy Ourisson, K. Ulrich Wendt, Georg E. Schulz, Alfred Blume, Thomas R. Neu, Thomas Härtner, George E. Fox and Peter Jurtshuk and has published in prestigious journals such as Nature, Science and Journal of the American Chemical Society.

In The Last Decade

Karl Poralla

84 papers receiving 4.4k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Prokaryotic Hopanoids and other Polyterpenoid Sterol Surrogates

1987 444 citations Karl Poralla et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Karl Poralla Germany	39	3.3k	636	599	566	455	85	4.6k
L. John Goad United Kingdom	43	2.4k 0.7×	407 0.6×	523 0.9×	518 0.9×	260 0.6×	148	5.7k
J. D. Bu’Lock United Kingdom	30	1.6k 0.5×	716 1.1×	291 0.5×	187 0.3×	169 0.4×	112	3.0k
Valery M. Dembitsky Israel	47	2.1k 0.7×	1.2k 2.0×	994 1.7×	348 0.6×	553 1.2×	272	8.2k
Glenn W. Patterson United States	30	1.5k 0.5×	160 0.3×	215 0.4×	169 0.3×	215 0.5×	113	3.3k
T. W. Goodwin United Kingdom	39	3.2k 1.0×	328 0.5×	372 0.6×	327 0.6×	204 0.4×	234	5.9k
James P. Freeman United States	44	1.7k 0.5×	636 1.0×	196 0.3×	398 0.7×	240 0.5×	155	5.7k
A. Gambacorta Italy	37	2.4k 0.7×	71 0.1×	387 0.6×	642 1.1×	177 0.4×	127	3.9k
S. Liaaen‐Jensen Norway	31	1.4k 0.4×	164 0.3×	314 0.5×	302 0.5×	131 0.3×	197	4.0k
Synnøve Liaaen‐Jensen Norway	40	2.4k 0.7×	288 0.5×	725 1.2×	646 1.1×	179 0.4×	315	6.7k
Karel Sigler Czechia	32	2.4k 0.7×	223 0.4×	293 0.5×	243 0.4×	690 1.5×	233	4.8k

Countries citing papers authored by Karl Poralla

Since Specialization

Citations

This map shows the geographic impact of Karl Poralla'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 Karl Poralla with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Karl Poralla more than expected).

Fields of papers citing papers by Karl Poralla

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Karl Poralla. 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 Karl Poralla. The network helps show where Karl Poralla may publish in the future.

Co-authorship network of co-authors of Karl Poralla

This figure shows the co-authorship network connecting the top 25 collaborators of Karl Poralla. A scholar is included among the top collaborators of Karl Poralla 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 Karl Poralla. Karl Poralla is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Nogueira, Marco Antônio, Uwe Nehls, Rüdiger Hampp, Karl Poralla, & Elke Jurandy Bran Nogueira Cardoso. (2007). Mycorrhiza and soil bacteria influence extractable iron and manganese in soil and uptake by soybean. Plant and Soil. 298(1-2). 273–284. 72 indexed citations

Poralla, Karl. (2004). Profound Insights into Squalene Cyclization. Chemistry & Biology. 11(1). 12–14. 12 indexed citations

Poralla, Karl. (2000). Hopanoids are formed during transition from substrate to aerial hyphae in Streptomyces coelicolor A3(2). FEMS Microbiology Letters. 189(1). 93–95. 4 indexed citations

Poralla, Karl, et al.. (2000). Hopanoids are formed during transition from substrate to aerial hyphae inStreptomyces coelicolorA3(2). FEMS Microbiology Letters. 189(1). 93–95. 105 indexed citations

Poralla, Karl, et al.. (2000). Conserved Tyr residues determine functions ofAlicyclobacillus acidocaldariussqualeneâhopene cyclase. FEMS Microbiology Letters. 183(2). 221–224. 29 indexed citations

Viola, Franca, Maurizio Ceruti, Luigi Cattel, et al.. (2000). Rationally designed inhibitors as tools for comparing the mechanism of squalene‐hopene cyclase with oxidosqualene cyclase. Lipids. 35(3). 297–303. 15 indexed citations

Abe, Ikuro, et al.. (1997). Cyclization of (3S)29-Methylidene-2,3-oxidosqualene by Bacterial Squalene:Hopene Cyclase: Irreversible Enzyme Inactivation and Isolation of an Unnatural Dammarenoid. Journal of the American Chemical Society. 119(46). 11333–11334. 22 indexed citations

Moore, Bradley S., Heinz G. Floss, & Karl Poralla. (1995). Three New ω-Cycloheptyl Fatty Acids from Alicyclobacillus cycloheptanicus and Their Biosynthetic Interrelationships. Journal of Natural Products. 58(4). 590–593. 8 indexed citations

Spring, Stefan, Rudolf Amann, Wolfgang Ludwig, et al.. (1995). Phylogenetic Analysis of Uncultured Magnetotactic Bacteria from the Alpha-Subclass of Proteobacteria. Systematic and Applied Microbiology. 17(4). 501–508. 57 indexed citations

10.

Poralla, Karl, et al.. (1994). A specific amino acid repeat in squalene and oxidosqualene cyclases. Trends in Biochemical Sciences. 19(4). 157–158. 132 indexed citations

11.

Ochs, Dietmar, Cortina Kaletta, Karl‐Dieter Entian, Annette G. Beck‐Sickinger, & Karl Poralla. (1992). Cloning, expression, and sequencing of squalene-hopene cyclase, a key enzyme in triterpenoid metabolism. Journal of Bacteriology. 174(1). 298–302. 104 indexed citations

12.

Wisotzkey, Jeffrey D., et al.. (1992). Comparative Sequence Analyses on the 16S rRNA (rDNA) of Bacillus acidocaldarius, Bacillus acidoterrestris, and Bacillus cycloheptanicus and Proposal for Creation of a New Genus, Alicyclobacillus gen. nov.. International Journal of Systematic Bacteriology. 42(2). 263–269. 314 indexed citations

13.

Poralla, Karl, et al.. (1990). Properties of Bacillus acidocaldarius mutants deficient in ?-cyclohexyl fatty acid biosynthesis. Archives of Microbiology. 153(5). 463–469. 21 indexed citations

14.

Schmidt, Andrea, Stephanie Bringer‐Meyer, Karl Poralla, & Hermann Sahm. (1989). Influence of ethanol on the activities of 3-hydroxy-3-methylglutaryl-coenzyme A-reductase and squalene-hopene-cyclase in Zymomonas mobilis. Applied Microbiology and Biotechnology. 30(2). 1 indexed citations

15.

Neu, Thomas R. & Karl Poralla. (1988). An amphiphilic polysaccharide from an adhesiveRhodococcusstrain. FEMS Microbiology Letters. 49(3). 389–392. 40 indexed citations

16.

Schmidt, Andrea, Stephanie Bringer‐Meyer, Karl Poralla, & Hermann Sahm. (1986). Effect of alcohols and temperature on the hopanoid content of Zymomonas mobilis. Applied Microbiology and Biotechnology. 25(1). 32–36. 37 indexed citations

17.

Poralla, Karl, Günther Jung, & Hermann Allgaier. (1985). ω‐Cycloheptyl‐α‐hydroxyundecanoic Acid, a New Fatty Acid from a Thermo‐acidophilic Bacillus Species. Liebigs Annalen der Chemie. 1985(2). 378–382. 4 indexed citations

18.

Kannenberg, Elmar L. & Karl Poralla. (1982). The influence of hopanoids on growth of Mycoplasma mycoides. Archives of Microbiology. 133(2). 100–102. 19 indexed citations

19.

Poralla, Karl, et al.. (1979). Experiments on the role of leucine dehydrogenase in initiation of Bacillus subtilis spore germination. FEMS Microbiology Letters. 5(2). 81–83. 4 indexed citations

20.

Thiebe, R. & Karl Poralla. (1973). Origin of the nucleoside Y in yeast tRNA^Phe. FEBS Letters. 38(1). 27–28. 20 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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