LabID-base/OpenAlex-Afillation huggingface dataset:
BDIViz: An Interactive Visualization System for Biomedical Schema Matching with LLM-Powered Validation
Year: 2025
Type: article
Language: en
Topic: Data Visualization and Analytics
Authors and affiliations:
raw_author_name: Eden Wu
raw_affiliation_strings: NYU Tandon School of Engineering, USA
raw_author_name: Dishita G Turakhia
raw_affiliation_strings: NYU Tandon School of Engineering, USA
raw_author_name: Guande Wu
raw_affiliation_strings: NYU Tandon School of Engineering, USA
raw_author_name: Christos Koutras
raw_affiliation_strings: NYU Tandon School of Engineering, USA
raw_author_name: Sarah Keegan
raw_affiliation_strings: NYU Grossman School of Medicine, USA
raw_author_name: Wenke Liu
raw_affiliation_strings: NYU Grossman School of Medicine, USA
raw_author_name: Beata Szeitz
raw_affiliation_strings: NYU Grossman School of Medicine, USA
raw_author_name: David Fenyo
raw_affiliation_strings: NYU Grossman School of Medicine, USA
raw_author_name: Cláudio T. Silva
raw_affiliation_strings: NYU Tandon School of Engineering, USA
raw_author_name: Juliana Freire
raw_affiliation_strings: NYU Tandon School of Engineering, USA
Electrochemical Nickel-Catalyzed Selective Defluorination for the Synthesis of α-Fluoroarylacetic Acid Derivatives
Year: 2025
Type: article
Language: en
Topic: Radical Photochemical Reactions
Authors and affiliations:
raw_author_name: Mei Li
raw_affiliation_strings: Harbin Institute of Technology (Shenzhen)
State Key Lab of Urban Water Resource and Environment, School of Science
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
raw_author_name: Pengwei Hu
raw_affiliation_strings: Harbin Institute of Technology (Shenzhen)
State Key Lab of Urban Water Resource and Environment, School of Science
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
raw_author_name: Ke Wang
raw_affiliation_strings: Harbin Institute of Technology (Shenzhen)
State Key Lab of Urban Water Resource and Environment, School of Science
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
raw_author_name: Yiwen Xia
raw_affiliation_strings: Harbin Institute of Technology (Shenzhen)
State Key Lab of Urban Water Resource and Environment, School of Science
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
raw_author_name: Yating Zhao
raw_affiliation_strings: College of Chemical and Material Engineering
Quzhou University
College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China
raw_author_name: Lin Guo
raw_affiliation_strings: Harbin Institute of Technology (Shenzhen)
State Key Lab of Urban Water Resource and Environment, School of Science
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
raw_author_name: Chao Yang
raw_affiliation_strings: Harbin Institute of Technology (Shenzhen)
State Key Lab of Urban Water Resource and Environment, School of Science
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
raw_author_name: Wujiong Xia
raw_affiliation_strings: Harbin Institute of Technology (Shenzhen)
Henan Normal University
School of Chemistry and Chemical Engineering
State Key Lab of Urban Water Resource and Environment, School of Science
School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
Persistent gender disparities in research productivity among U.S. reproductive endocrinologists: a cross-sectional analysis
Year: 2025
Type: article
Language: en
Topic: Diversity and Career in Medicine
Authors and affiliations:
raw_author_name: Elisheva Knopf
raw_affiliation_strings: Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA. eknopf2023@health.fau.edu
raw_author_name: Shalakha Bonthu
raw_affiliation_strings: Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA
raw_author_name: Pranav Meka
raw_affiliation_strings: Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA
raw_author_name: Elana Eisenreich
raw_affiliation_strings: SUNY Downstate College of Medicine, Brooklyn, NY, USA
raw_author_name: Leah Roberts
raw_affiliation_strings: Boca Fertility IVF & Genetics, Boca Raton, FL, USA
raw_author_name: Michele Retrouvey
raw_affiliation_strings: Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA
Photobiomodulation limits oral ulcer development by regulating the immune response
Year: 2025
Type: article
Language: en
Topic: Laser Applications in Dentistry and Medicine
Authors and affiliations:
raw_author_name: Siying Zhu
raw_affiliation_strings: Center for Microscope Enhanced Dentistry, Beijing stomatological Hospital, Capital Medical University, Beijing, PR China
Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University Laboratory of Tissue Regeneration and Immunology, Beijing, PR China
raw_author_name: Jingfei Fu
raw_affiliation_strings: Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University Laboratory of Tissue Regeneration and Immunology, Beijing, PR China
Center for Microscope Enhanced Dentistry, Beijing stomatological Hospital, Capital Medical University, Beijing, PR China
raw_author_name: Xiaoyan Li
raw_affiliation_strings: Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University Laboratory of Tissue Regeneration and Immunology, Beijing, PR China
Center for Microscope Enhanced Dentistry, Beijing stomatological Hospital, Capital Medical University, Beijing, PR China
raw_author_name: Juan Du
raw_affiliation_strings: Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University Laboratory of Tissue Regeneration and Immunology, Beijing, PR China
Center for Microscope Enhanced Dentistry, Beijing stomatological Hospital, Capital Medical University, Beijing, PR China
raw_author_name: Yi Liu
raw_affiliation_strings: Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University Laboratory of Tissue Regeneration and Immunology, Beijing, PR China. lililiuyi@163.com
Center for Microscope Enhanced Dentistry, Beijing stomatological Hospital, Capital Medical University, Beijing, PR China. lililiuyi@163.com
Association Between Smoking and Opioid Requirement and Pain Intensity in the Early Postoperative Period: A Meta-Analysis
Year: 2025
Type: article
Language: en
Topic: Opioid Use Disorder Treatment
Authors and affiliations:
raw_author_name: Istvan S. Szilagyi
raw_affiliation_strings: Department of Medical Psychology and Psychotherapy, Medical University of Graz, Graz, Austria
raw_author_name: Torsten Ullrich
raw_affiliation_strings: Fraunhofer Austria Research GmbH, Vienna, Austria
Institute of Computer Graphics and Knowledge Visualisation, Graz University of Technology, Graz, Austria
raw_author_name: Christoph Klivinyi
raw_affiliation_strings: Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, Auenbruggerplatz 5/5, 8036, Graz, Austria
raw_author_name: Kordula Lang-Illievich
raw_affiliation_strings: Department of Anaesthesiology and Intensive Care Medicine, Klinikum Güssing, Güssing, Austria
Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, Auenbruggerplatz 5/5, 8036, Graz, Austria
raw_author_name: Connor T. A. Brenna
raw_affiliation_strings: Department of Anesthesiology and Pain Medicine, University of Toronto, Toronto, ON, Canada
raw_author_name: Brigitte Messerer
raw_affiliation_strings: Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, Auenbruggerplatz 5/5, 8036, Graz, Austria
raw_author_name: Helmar Bornemann-Cimenti
raw_affiliation_strings: Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, Auenbruggerplatz 5/5, 8036, Graz, Austria. helmar.bornemann@medunigraz.at
VcAMT14 Enhances Ammonium Uptake in Blueberries During Mycorrhizal Symbiosis
Year: 2025
Type: article
Language: en
Topic: Plant nutrient uptake and metabolism
Authors and affiliations:
raw_author_name: Xuyang Chen
raw_affiliation_strings: College of Horticulture Jilin Agricultural University Changchun, Jilin China
College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
raw_author_name: Ruizhi Wang
raw_affiliation_strings: College of Horticulture Jilin Agricultural University Changchun, Jilin China
College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
raw_author_name: Xinyu Mao
raw_affiliation_strings: College of Horticulture Jilin Agricultural University Changchun, Jilin China
College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
raw_author_name: Mei Dong
raw_affiliation_strings: College of Horticulture Jilin Agricultural University Changchun, Jilin China
College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
raw_author_name: Li Chen
raw_affiliation_strings: College of Horticulture Jilin Agricultural University Changchun, Jilin China
College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
raw_author_name: Yadong Li
raw_affiliation_strings: College of Horticulture Jilin Agricultural University Changchun, Jilin China
College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
raw_author_name: Haiyue Sun
raw_affiliation_strings: College of Horticulture Jilin Agricultural University Changchun, Jilin China
College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
The unseen violation: A patient's dignity in the digital era
Year: 2025
Type: article
Language: en
Topic: Patient Dignity and Privacy
Authors and affiliations:
raw_author_name: Maryam Mirzaei
raw_affiliation_strings: Department of Physiotherapy, School of Rehabilitation Sciences Kermanshah University of Medical Sciences  Kermanshah Iran
Department of Physiotherapy, School of Rehabilitation Sciences, Kermanshah University of Medical Sciences, Kermanshah, Iran
Immune-stromal heterogeneity in breast cancer across diverse ancestries: impact on prognosis and treatment response
Year: 2025
Type: article
Language: en
Topic: Cancer Immunotherapy and Biomarkers
Authors and affiliations:
raw_author_name: Nanfizat A. Alamukii
raw_affiliation_strings: Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. nanfizat.abiket.alamukii@gu.se
Sahlgrenska Center for Cancer Research, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. nanfizat.abiket.alamukii@gu.se
raw_author_name: Anikó Kovács
raw_affiliation_strings: Department of Clinical Pathology, Region Västra Götaland, Sahlgrenska University Hospital, Gothenburg, Sweden
raw_author_name: Sukanya Raghavan
raw_affiliation_strings: Department of Clinical Immunology and Transfusion Medicine, Region Västra Götaland, Sahlgrenska University Hospital, Gothenburg, Sweden
Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
raw_author_name: Josefin Ilio
raw_affiliation_strings: Department of Laboratory Medicine, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
raw_author_name: Per Karlsson
raw_affiliation_strings: Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
Department of Oncology, Region Västra Götaland, Sahlgrenska University Hospital, Gothenburg, Sweden
raw_author_name: Khalil Helou
raw_affiliation_strings: Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
Sahlgrenska Center for Cancer Research, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
raw_author_name: Toshima Z. Parris
raw_affiliation_strings: Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
Sahlgrenska Center for Cancer Research, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
Multilevel analysis of improved water utilization and associated factors in Yemen: using 2013 DHS Yemen national dataset
Year: 2025
Type: article
Language: en
Topic: Child Nutrition and Water Access
Authors and affiliations:
raw_author_name: Lamrot Yohannes
raw_affiliation_strings: Department of Environmental and Occupational Health and Safety, Institute of Public Health, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia. Lamrot.Yohannes@uog.edu.et
raw_author_name: Mengesha Genet
raw_affiliation_strings: Department of Environmental and Occupational Health and Safety, Institute of Public Health, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
raw_author_name: Sisay Deme
raw_affiliation_strings: Department of Physiotherapy, Faculty of Medical Science, Institute of Health, Jimma University, Jimma, Ethiopia
raw_author_name: Asmare Asrat Yirdaw
raw_affiliation_strings: Department of Environmental Health, Institute of Public Health, College of Medicine and Health Sciences, Arba Minch University, Arba Minch, Ethiopia
raw_author_name: Mequannent Sharew Melaku
raw_affiliation_strings: Department of Health Informatics, Institute of Public Health, University of Gondar, Gondar, Ethiopia
Generation of Intestinal and Colonic Organoids Derived From Human Pluripotent Stem Cells
Year: 2025
Type: article
Language: en
Topic: Cancer Cells and Metastasis
Authors and affiliations:
raw_author_name: Lola Bonneau
raw_affiliation_strings: Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
raw_author_name: Lisa Brossard
raw_affiliation_strings: Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
raw_author_name: Theo Noël
raw_affiliation_strings: Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
raw_author_name: Victor Perreaux
raw_affiliation_strings: Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
raw_author_name: Laura Bachir
raw_affiliation_strings: Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
raw_author_name: Archie Khan
raw_affiliation_strings: Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
raw_author_name: Simon Vales
raw_affiliation_strings: Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
raw_author_name: Maxime M. Mahe
raw_affiliation_strings: Center for Stem Cell and Organoid Medicine Cincinnati Children's Hospital Medical Center  Cincinnati Ohio USA
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD  Nantes France
Nantes Université, CHU Nantes, Inserm, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
Center for Stem Cell and Organoid Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
Spatial effects of the synergistic development between agricultural carbon sequestration and emission reduction and food security across China’s grain functional areas
Year: 2025
Type: article
Language: en
Topic: Land Use and Ecosystem Services
Authors and affiliations:
raw_author_name: Yidi Wang
raw_affiliation_strings: School of Earth Science and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
raw_author_name: Xianzhao Liu
raw_affiliation_strings: School of Earth Science and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
raw_author_name: Jiaxi Liu
raw_affiliation_strings: School of Economics, Guangxi Minzu University, Nanning, 530006, China. 202412240300327@stu.gxmzu.edu.cn
Synthesis and antidiabetic evaluation of novel Tetrahydroacridine derivatives with computational insights
Year: 2025
Type: article
Language: en
Topic: Multicomponent Synthesis of Heterocycles
Authors and affiliations:
raw_author_name: Asmaa M. Kadry
raw_affiliation_strings: Chemistry Department, Faculty of Science, Sohag University, Sohag, 82524, Egypt. asmaa.kadry@science.sohag.edu.eg
raw_author_name: Wafaa A. Abdellah
raw_affiliation_strings: Medical Pharmacology Department, Faculty of Medicine, Sohag University, Sohag, Egypt
raw_author_name: Mounir A. A. Mohamed
raw_affiliation_strings: Chemistry Department, Faculty of Science, Sohag University, Sohag, 82524, Egypt
raw_author_name: Mahmoud S. Tolba
raw_affiliation_strings: Chemistry Department, Faculty of Science, New Valley University, El-Kharja, 72511, Egypt
Hydrogen Disproportionation Reduces the Bandgap and Prolongs the Carrier Lifetime in Cs <sub>2</sub> AgBiBr <sub>6</sub> : Quantum Dynamics Analysis
Year: 2025
Type: article
Language: en
Topic: Perovskite Materials and Applications
Authors and affiliations:
raw_author_name: Emir S. Amirov
raw_affiliation_strings: HSE University
HSE University, 101000 Moscow, Russia
raw_author_name: Dongyu Liu
raw_affiliation_strings: HSE University
HSE University, 101000 Moscow, Russia
raw_author_name: Mikhail R. Samatov
raw_affiliation_strings: HSE University
HSE University, 101000 Moscow, Russia
raw_author_name: Dmitrii A. Abrameshin
raw_affiliation_strings: HSE University
HSE University, 101000 Moscow, Russia
raw_author_name: Andrey E. Abrameshin
raw_affiliation_strings: HSE University
HSE University, 101000 Moscow, Russia
raw_author_name: Alexander S. Kramarenko
raw_affiliation_strings: Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences, 242432 Chernogolovka, Russia
raw_author_name: Pavel A. Troshin
raw_affiliation_strings: Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences, 242432 Chernogolovka, Russia
raw_author_name: Weibin Chu
raw_affiliation_strings: Fudan University
Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences
Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, Fudan University, Shanghai 200433, China
raw_author_name: Huanping Zhou
raw_affiliation_strings: Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, School of Materials Science and Engineering
Peking University
Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, School of Materials Science and Engineering, Peking University, Beijing 100871, China
raw_author_name: Andrey S. Vasenko
raw_affiliation_strings: Donostia International Physics Center (DIPC)
HSE University
HSE University, 101000 Moscow, Russia
Donostia International Physics Center (DIPC), 20018 San Sebastián - Donostia, Euskadi, Spain
raw_author_name: Oleg V. Prezhdo
raw_affiliation_strings: Department of Chemistry and Chemical Biology
University of New Mexico
Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87106, United States
Serum prolactin level in male type 2 diabetes mellitus patients at the University of Gondar Comprehensive Specialized Hospital, Northwest Ethiopia, 2024
Year: 2025
Type: article
Language: en
Topic: Growth Hormone and Insulin-like Growth Factors
Authors and affiliations:
raw_author_name: Arega Zenaw
raw_affiliation_strings: Department of Clinical Chemistry, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia. azenaw1990@gmail.com
raw_author_name: Elias Chane
raw_affiliation_strings: Department of Clinical Chemistry, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia
raw_author_name: Getnet Fetene
raw_affiliation_strings: Department of Clinical Chemistry, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia
raw_author_name: Sintayehu Admas
raw_affiliation_strings: Department of Hematology and Immunohematology, School of Biomedical and Laboratory Science, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
raw_author_name: Nigusie Alemu
raw_affiliation_strings: Department of Hematology and Immunohematology, School of Biomedical and Laboratory Science, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
raw_author_name: Mitkie Tigabie
raw_affiliation_strings: Department of Medical Microbiology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia
raw_author_name: Belete Biadgo
raw_affiliation_strings: Department of Clinical Chemistry, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia
raw_author_name: Abebaw Worede
raw_affiliation_strings: Department of Clinical Chemistry, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia