Robert A. Ludwig

2.2k total citations · 1 hit paper
39 papers, 1.8k citations indexed

About

Robert A. Ludwig is a scholar working on Plant Science, Molecular Biology and Pollution. According to data from OpenAlex, Robert A. Ludwig has authored 39 papers receiving a total of 1.8k indexed citations (citations by other indexed papers that have themselves been cited), including 28 papers in Plant Science, 9 papers in Molecular Biology and 9 papers in Pollution. Recurrent topics in Robert A. Ludwig's work include Legume Nitrogen Fixing Symbiosis (24 papers), Plant nutrient uptake and metabolism (21 papers) and Wastewater Treatment and Nitrogen Removal (9 papers). Robert A. Ludwig is often cited by papers focused on Legume Nitrogen Fixing Symbiosis (24 papers), Plant nutrient uptake and metabolism (21 papers) and Wastewater Treatment and Nitrogen Removal (9 papers). Robert A. Ludwig collaborates with scholars based in United States, France and Sweden. Robert A. Ludwig's co-authors include Pascal A. Stein, Gerard R. Lazo, Robert G. K. Donald, Christopher K. Raymond, Christopher L. Kitts, Lars‐Erik Strender, Ethan R. Signer, Adam Taube, David W. Nees and G.E de Vries and has published in prestigious journals such as Nature, Proceedings of the National Academy of Sciences and Nucleic Acids Research.

In The Last Decade

Robert A. Ludwig

38 papers receiving 1.7k 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.

A DNA Transformation–Competent Arabidopsis Genomic Library in Agrobacterium

1991 852 citations Gerard R. Lazo, Pascal A. Stein et al. Bio/Technology profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Robert A. Ludwig United States	19	1.2k	957	270	144	141	39	1.8k
Alex Richman Canada	11	538 0.5×	859 0.9×	272 1.0×	57 0.4×	59 0.4×	11	1.5k
Yanru Chen China	28	732 0.6×	675 0.7×	164 0.6×	77 0.5×	80 0.6×	67	1.8k
Juliet W. Welch United States	21	559 0.5×	1.1k 1.1×	33 0.1×	70 0.5×	64 0.5×	26	1.6k
Ramesh Maheshwari India	18	628 0.5×	738 0.8×	452 1.7×	33 0.2×	154 1.1×	64	1.5k
Rose Adele Monteiro Brazil	26	1.1k 1.0×	816 0.9×	82 0.3×	180 1.3×	39 0.3×	85	1.9k
Chengyun Li China	19	1.0k 0.9×	474 0.5×	80 0.3×	28 0.2×	86 0.6×	113	1.5k
Hyeong Cheol Park South Korea	34	3.2k 2.8×	2.0k 2.1×	120 0.4×	91 0.6×	30 0.2×	74	3.8k
Shigeyuki Tajima Japan	24	1.2k 1.0×	486 0.5×	144 0.5×	51 0.4×	18 0.1×	97	1.8k
Tania González Cuba	17	566 0.5×	381 0.4×	138 0.5×	50 0.3×	63 0.4×	37	1.1k
Robert D. Locy United States	23	1.0k 0.9×	719 0.8×	179 0.7×	21 0.1×	28 0.2×	48	1.5k

Countries citing papers authored by Robert A. Ludwig

Since Specialization

Citations

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

Fields of papers citing papers by Robert A. Ludwig

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Robert A. Ludwig. 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 Robert A. Ludwig. The network helps show where Robert A. Ludwig may publish in the future.

Co-authorship network of co-authors of Robert A. Ludwig

This figure shows the co-authorship network connecting the top 25 collaborators of Robert A. Ludwig. A scholar is included among the top collaborators of Robert A. Ludwig 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 Robert A. Ludwig. Robert A. Ludwig 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

Dietzel, Lars, et al.. (2013). Photosynthetic acclimation responses of maize seedlings grown under artificial laboratory light gradients mimicking natural canopy conditions. Frontiers in Plant Science. 4. 334–334. 18 indexed citations

Sprecher, Brittany N., et al.. (2012). Respiratory Membrane endo-Hydrogenase Activity in the Microaerophile Azorhizobium caulinodans Is Bidirectional. PLoS ONE. 7(5). e36744–e36744. 2 indexed citations

Ng, Gordon, et al.. (2009). A Novel Endo-Hydrogenase Activity Recycles Hydrogen Produced by Nitrogen Fixation. PLoS ONE. 4(3). e4695–e4695. 6 indexed citations

Ludwig, Robert A., et al.. (2004). Arabidopsis thaliana GLN2-Encoded Glutamine Synthetase Is Dual Targeted to Leaf Mitochondria and Chloroplasts. The Plant Cell. 16(8). 2048–2058. 130 indexed citations

Ludwig, Robert A.. (2003). Microaerophilic bacteria transduce energy via oxidative metabolic gearing. Research in Microbiology. 155(2). 61–70. 12 indexed citations

Strender, Lars‐Erik, et al.. (1997). Interexaminer Reliability in Physical Examination of Patients With Low Back Pain. Spine. 22(7). 814–820. 121 indexed citations

Ludwig, Robert A., et al.. (1995). Interactive regulation of Azorhizobium nifA transcription via overlapping promoters. Journal of Bacteriology. 177(24). 7210–7221. 22 indexed citations

Ludwig, Robert A., et al.. (1994). Jesus and faith : a conversation on the work of John Dominic Crossan. 6 indexed citations

Kuhn, Robert M. & Robert A. Ludwig. (1994). Complete sequence of the yeast artificial chromosome cloning vector pYAC4. Gene. 141(1). 125–127. 11 indexed citations

10.

Kitts, Christopher L. & Robert A. Ludwig. (1994). Azorhizobium caulinodans respires with at least four terminal oxidases. Journal of Bacteriology. 176(3). 886–895. 29 indexed citations

11.

Ludwig, Robert A.. (1993). Arabidopsis Chloroplasts Dissimilate L-Arginine and L-Citrulline for Use as N Source. PLANT PHYSIOLOGY. 101(2). 429–434. 43 indexed citations

12.

Lazo, Gerard R., Pascal A. Stein, & Robert A. Ludwig. (1991). A DNA Transformation–Competent Arabidopsis Genomic Library in Agrobacterium. Bio/Technology. 9(10). 963–967. 852 indexed citations breakdown →

13.

Nees, David W., Pascal A. Stein, & Robert A. Ludwig. (1988). TheAzorhizobium caulinodans nifAgene: identification of upstream-activating sequences including a new element, the ‘anaerobox’. Nucleic Acids Research. 16(20). 9839–9853. 34 indexed citations

14.

Donald, Robert G. K., et al.. (1988). Characterization of the Azorhizobium sesbaniae ORS571 genomic locus encoding NADPH-glutamate synthase. Journal of Bacteriology. 170(3). 1197–1204. 6 indexed citations

15.

Ludwig, Robert A.. (1987). Gene tandem-mediated selection of coliphage λ-receptive Agrobacterium, Pseudomonas , and Rhizobium strains. Proceedings of the National Academy of Sciences. 84(10). 3334–3338. 14 indexed citations

16.

Donald, Robert G. K., et al.. (1986). Characterization of three genomic loci encoding Rhizobium sp. strain ORS571 N2 fixation genes. Journal of Bacteriology. 165(1). 72–81. 36 indexed citations

17.

Ludwig, Robert A.. (1978). Control of ammonium assimilation in Rhizobium 32H1. Journal of Bacteriology. 135(1). 114–123. 38 indexed citations

18.

Cerveny, Robert P., Vijay Mahajan, & Robert A. Ludwig. (1978). Management information systems in health systems agencies: Some considerations. Socio-Economic Planning Sciences. 12(5). 229–236. 2 indexed citations

19.

Ludwig, Robert A. & William C. Summers. (1976). Localization of RNA polymerase binding sites on T7 DNA. Virology. 71(1). 278–290. 7 indexed citations

20.

Ludwig, Robert A. & William C. Summers. (1975). A restriction fragment analysis of the T7 left-early region. Virology. 68(2). 360–373. 23 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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