A.J. Speek
- Biochemistry top 2%
- Antioxidant Activity and Oxidative Stress 4
- Amino Acid Enzymes and Metabolism 1
- Nutrition and Dietetics top 5%
- Vitamin C and Antioxidants Research 2
- Food composition and properties 1
- Hematology top 5%
- Iron Metabolism and Disorders 2
-
- Folate and B Vitamins Research 2
-
- Retinoids in leukemia and cellular processes 3
-
- Carcinogens and Genotoxicity Assessment 2
- Co-authors
- J. SchrijverW.H.P. SchreursSastri SaowakonthaMichel WedelMartin W. BloemJ. LindemanDiny van Zoeren‐GrobbenHoward Berger
- Journals
- American Journal of Clinical Nutrition (2 papers)Journal of Chromatography A (2 papers)Clinical Chemistry and Laboratory Medicine (CCLM) (1 paper)
- Partner nations
- NetherlandsTanzaniaThailand
In The Last Decade
A.J. Speek
16 papers receiving 900 citations
Peers
Comparison fields: 5 of 114
- Biochemistry 222
- Nutrition and Dietetics 338
- Hematology 163
- Rheumatology 76
- Pediatrics, Perinatology and Child Health 98
Countries citing papers authored by A.J. Speek
This map shows the geographic impact of A.J. Speek'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 A.J. Speek with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites A.J. Speek more than expected).
Fields of papers citing papers by A.J. Speek
This network shows the impact of papers produced by A.J. Speek. 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 A.J. Speek. The network helps show where A.J. Speek may publish in the future.
Co-authorship network
The 20 scholars most cited alongside A.J. Speek, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.
All Works
| # | Work | ||
|---|---|---|---|
| 1 | 1990 | 115 | |
| 2 | 1989 | 126 | |
| 3 | 1989 | 142 | |
| 4 | 1986 | 9 | |
| 5 | 1986 | 70 | |
| 6 | 1986 | 15 | |
| 7 | 1986 | 13 | |
| 8 | 1985 | 136 | |
| 9 | 1984 | 31 | |
| 10 | 1984 | 154 | |
| 11 | 1983 | 30 | |
| 12 | けい光検出を行う高性能液体クロマトグラフィーによる全血中のB 2 ビタマ フラビン-アデニンジヌクレオチドの定量 | 1982 | 27 |
| 13 | 1982 | 39 | |
| 14 | 1981 | 50 | |
| 15 | 1975 | 10 | |
| 16 | 1972 | 8 |
About A.J. Speek
A.J. Speek is a scholar working on Biochemistry, Nutrition and Dietetics, Hematology, Biophysics and Clinical Biochemistry, having authored 16 papers that have together received 975 indexed citations. Recurring topics across this work include Antioxidant Activity and Oxidative Stress (4 papers), Retinoids in leukemia and cellular processes (3 papers), Vitamin C and Antioxidants Research (2 papers), Carcinogens and Genotoxicity Assessment (2 papers), Folate and B Vitamins Research (2 papers), Iron Metabolism and Disorders (2 papers), Amino Acid Enzymes and Metabolism (1 paper) and Food composition and properties (1 paper). The work is most often cited by research in Biochemistry (222 citations), Nutrition and Dietetics (338 citations), Hematology (163 citations), Rheumatology (76 citations) and Pediatrics, Perinatology and Child Health (98 citations). A.J. Speek has collaborated with scholars based in Netherlands, Tanzania and Thailand. Frequent co-authors include J. Schrijver, W.H.P. Schreurs, Sastri Saowakontha, Michel Wedel, Martin W. Bloem, J. Lindeman, Diny van Zoeren‐Grobben, Howard Berger, Ben J. H. M. Poorthuis and V.J. Feron. Their work appears in journals such as American Journal of Clinical Nutrition, Journal of Chromatography A, Clinical Chemistry and Laboratory Medicine (CCLM), Food Chemistry and Pediatric Research.
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.