Charles U. Ugwu

3.6k total citations · 2 hit papers
19 papers, 2.4k citations indexed

About

Charles U. Ugwu is a scholar working on Renewable Energy, Sustainability and the Environment, Molecular Biology and Biomaterials. According to data from OpenAlex, Charles U. Ugwu has authored 19 papers receiving a total of 2.4k indexed citations (citations by other indexed papers that have themselves been cited), including 9 papers in Renewable Energy, Sustainability and the Environment, 6 papers in Molecular Biology and 5 papers in Biomaterials. Recurrent topics in Charles U. Ugwu's work include Algal biology and biofuel production (9 papers), biodegradable polymer synthesis and properties (5 papers) and Aquatic Ecosystems and Phytoplankton Dynamics (4 papers). Charles U. Ugwu is often cited by papers focused on Algal biology and biofuel production (9 papers), biodegradable polymer synthesis and properties (5 papers) and Aquatic Ecosystems and Phytoplankton Dynamics (4 papers). Charles U. Ugwu collaborates with scholars based in Japan, Canada and Nigeria. Charles U. Ugwu's co-authors include Yutaka Tokiwa, Hideki Aoyagi, Sei‐ichi Aiba, Buenaventurada P. Calabia, Hiroo Uchiyama, Y. Tokiwa, Hisashi Tanaka, James C. Ogbonna, Yaser Dahman and Toshio Ichiba and has published in prestigious journals such as Bioresource Technology, International Journal of Molecular Sciences and Journal of Applied Microbiology.

In The Last Decade

Charles U. Ugwu

18 papers receiving 2.3k 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.

Biodegradability of Plastics

2009 1.2k citations Yutaka Tokiwa, Buenaventurada P. Calabia et al. International Journal of Molecular Sciences profile →
Photobioreactors for mass cultivation of algae

2007 722 citations Charles U. Ugwu, Hideki Aoyagi et al. Bioresource Technology profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Charles U. Ugwu Japan	12	986	923	797	552	360	19	2.4k
Eleni Koutra Greece	21	372 0.4×	741 0.8×	728 0.9×	410 0.7×	197 0.5×	31	2.0k
Françoise Silvestre France	22	1.3k 1.3×	183 0.2×	807 1.0×	317 0.6×	215 0.6×	30	2.5k
Hee Taek Kim South Korea	31	751 0.8×	205 0.2×	573 0.7×	642 1.2×	987 2.7×	74	2.5k
Tatiana G. Volova Russia	39	3.2k 3.3×	377 0.4×	1.5k 1.9×	1.5k 2.7×	672 1.9×	207	4.7k
Tae‐Rim Choi South Korea	29	985 1.0×	202 0.2×	779 1.0×	739 1.3×	726 2.0×	60	2.4k
Hee Wook Ryu South Korea	25	307 0.3×	136 0.1×	610 0.8×	430 0.8×	317 0.9×	100	1.9k
Doris Ying Ying Tang Malaysia	13	219 0.2×	459 0.5×	368 0.5×	360 0.7×	182 0.5×	35	1.4k
Natalia O. Zhila Russia	22	722 0.7×	334 0.4×	477 0.6×	400 0.7×	319 0.9×	67	1.3k
Jong-Min Jeon South Korea	28	1.3k 1.3×	134 0.1×	846 1.1×	893 1.6×	858 2.4×	81	2.5k
Derek R. Vardon United States	24	543 0.6×	492 0.5×	263 0.3×	3.8k 6.8×	1.1k 3.1×	45	4.9k

Countries citing papers authored by Charles U. Ugwu

Since Specialization

Citations

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

Fields of papers citing papers by Charles U. Ugwu

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Charles U. Ugwu. 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 Charles U. Ugwu. The network helps show where Charles U. Ugwu may publish in the future.

Co-authorship network of co-authors of Charles U. Ugwu

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

All Works

Sort: Min cites: Since: Top N: Style:

19 of 19 papers shown

Okon, Michael Ben, et al.. (2025). Nutritional composition of Zea mays L: A comprehensive Review of Macronutrients, Micronutrients, and Bioactive Compounds. 8. 15–15.

Dahman, Yaser & Charles U. Ugwu. (2014). Production of green biodegradable plastics of poly(3-hydroxybutyrate) from renewable resources of agricultural residues. Bioprocess and Biosystems Engineering. 37(8). 1561–1568. 25 indexed citations

Ugwu, Charles U. & Hideki Aoyagi. (2012). Microalgal Culture Systems: An Insight into their Designs, Operation and Applications. Biotechnology(Faisalabad). 11(3). 127–132. 16 indexed citations

Aoyagi, Hideki & Charles U. Ugwu. (2011). Fullerene fine particles adhere to pollen grains and affect their autofluorescence and germination. Dove Medical Press (Taylor and Francis Group). 67–67. 6 indexed citations

Ugwu, Charles U., et al.. (2011). Efficient production of d-(−)-lactic acid from broken rice by Lactobacillus delbrueckii using Ca(OH)2 as a neutralizing agent. Bioresource Technology. 104. 791–794. 94 indexed citations

Ugwu, Charles U., Yutaka Tokiwa, & Toshio Ichiba. (2011). Production of (R)-3-hydroxybutyric acid by fermentation and bioconversion processes with Azohydromonas lata. Bioresource Technology. 102(12). 6766–6768. 18 indexed citations

Ugwu, Charles U. & Hideki Aoyagi. (2011). Evaluation of the Mass Transfer Capacity of a Long Tubular Photobioreactor with Static Mixer and its Outdoor Performance with Microalgal Cultures. Trends in Applied Sciences Research. 6(10). 1222–1229. 3 indexed citations

Ugwu, Charles U., Yutaka Tokiwa, & Hideki Aoyagi. (2011). Utilization of Broken Rice for the Production of Poly(3-hydroxybutyrate). Journal of environmental polymer degradation. 20(1). 254–257. 10 indexed citations

Tokiwa, Yutaka, Buenaventurada P. Calabia, Charles U. Ugwu, & Sei‐ichi Aiba. (2009). Biodegradability of Plastics. International Journal of Molecular Sciences. 10(9). 3722–3742. 1205 indexed citations breakdown →

10.

Ugwu, Charles U. & Hideki Aoyagi. (2008). Influence of shading inclined tubular photobioreactor surfaces on biomass productivity of C. sorokiniana. Photosynthetica. 46(2). 8 indexed citations

11.

Ugwu, Charles U., Y. Tokiwa, Hideki Aoyagi, Hironobu Uchiyama, & Hisashi Tanaka. (2008). UV mutagenesis ofCupriavidus necatorfor extracellular production of (R)-3-hydroxybutyric acid. Journal of Applied Microbiology. 105(1). 236–242. 12 indexed citations

12.

Aoyagi, Hideki, Hideki Ishii, Charles U. Ugwu, & Hideo Tanaka. (2007). Effect of heat-generated product from uronic acids on the physiological activities of microbial cells and its application. Bioresource Technology. 99(10). 4534–4538. 11 indexed citations

13.

Ugwu, Charles U., Hideki Aoyagi, & Hiroo Uchiyama. (2007). Photobioreactors for mass cultivation of algae. Bioresource Technology. 99(10). 4021–4028. 722 indexed citations breakdown →

14.

Tokiwa, Y. & Charles U. Ugwu. (2007). Biotechnological production of (R)-3-hydroxybutyric acid monomer. Journal of Biotechnology. 132(3). 264–272. 85 indexed citations

15.

Ugwu, Charles U., Hideki Aoyagi, & Hiroo Uchiyama. (2007). Influence of irradiance, dissolved oxygen concentration, and temperature on the growth of Chlorella sorokiniana. Photosynthetica. 45(2). 309–311. 106 indexed citations

16.

Ugwu, Charles U., James C. Ogbonna, & Hisashi Tanaka. (2005). Light/dark cyclic movement of algal culture (Synechocystis aquatilis) in outdoor inclined tubular photobioreactor equipped with static mixers for efficient production of biomass. Biotechnology Letters. 27(2). 75–78. 40 indexed citations

17.

Ugwu, Charles U., James C. Ogbonna, & Hisashi Tanaka. (2005). Characterization of light utilization and biomass yields of Chlorella sorokiniana in inclined outdoor tubular photobioreactors equipped with static mixers. Process Biochemistry. 40(11). 3406–3411. 43 indexed citations

18.

Ugwu, Charles U., James C. Ogbonna, & Hisashi Tanaka. (2003). Design of static mixers for inclined tubular photobioreactors. Journal of Applied Phycology. 15(2-3). 217–223. 32 indexed citations

19.

Ogbonna, James C., et al.. (2001). An integrated system of solar light, artificial light and organic carbon supply for cyclic photoautotrophic-heterotrophic cultivation of photosynthetic cells under day–night cycles. Biotechnology Letters. 23(17). 1401–1406. 6 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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