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Taylor Crooks
Taylor Crooks
Assistant Professor of Biology
Jewett Science Center 123
- 605-626-2419
Education
- PhD: Microbiology, Immunology, and Cancer Biology (University of Minnesota - Twin Cities)
- BS: Molecular & Cellular Biology (University of Illinois - Urbana-Champaign)
Courses Taught
- Microbiology
- Microbiology Lab
- General Microbiology
- General Microbiology Lab
- General Biology Lab I
- General Biology Lab II
- Basic R Programming
Research Interests
Microbes shape human life in various ways ranging from promoting health to causing deadly diseases. My research focuses on combating tuberculosis, one of the deadliest infectious diseases caused by Mycobacterium tuberculosis (Mtb). Mtb is especially challenging due to long treatment times and rising drug resistance. To understand how Mtb evolves resistance, I employ molecular techniques such as transposon mutagenesis, evolution experiments with subinhibitory drug concentrations, PCR, and sequencing-based approaches to identify genes that influence susceptibility against emerging therapeutics.
In addition to my research in Mtb, I believe in supporting all undergraduate research in infectious disease, including projects outside of the scope of my own research program. Such examples include host-pathogen interactions in Porphyromonas species, characterizing nutritional requirements in non-tubercular mycobacteria, and other infectious disease related projects.
Having been formally trained in both wet lab and computational methods, I aim to mentor students in developing skills that they are passionate about, to support their growth, and to help them align their research experience with their career goals.
To learn more about research in the Crooks lab, visit crookslab.com.
Anessa DeMers
Anessa DeMers
Assistant Professor of Biology
Jewett Science Center 124
- 605-626-2352
Ph.D. The Ohio State University
B.S. University of Minnesota - Minneapolis
Dr. Anessa DeMers started at NSU in 2025. She is originally from Minnesota and got her undergraduate degree at the University of Minnesota before moving to Ohio for graduate school. Her research background is in paleontology and her Ph.D. work at The Ohio State University involved studying how mammal teeth and diets change over time. Her primary teaching responsibilities are in Anatomy and Physiology serving NSU’s growing pre-healthcare community, and she is also a co-director of the NSU Regional Science Fair.
Research Interests
Dr. DeMers studies the relationship between form and function in mammalian teeth and how this relationship has changed over evolutionary time. She specializes in the 3D digital analysis of teeth and bones. Her current work explores how the shape and number of tooth roots impacts the function of the rest of the tooth by comparing the tooth roots of living and extinct mammals.
Courses Taught
- Anatomy and Physiology I and II
- General Biology Lab
- Vertebrate Zoology
- Birds and Mammals
Selected Publications and Presentations
DeMers, A., and J. Hunter. 2024. Dental complexity and diet in amniotes: A meta-analysis. Plos one 19.2: e0292358.
DeMers, A., and J. Hunter. 2023. Getting back to our roots: what tooth root number can tell us about the ecology and phylogeny of fossil mammals. Society of Vertebrate Paleontology Annual Meeting.
DeMers, A., and J. Hunter. 2022. Meta-analysis of orientation patch count rotated (OPCR) and dietary inference in terrestrial amniotes. Society of Vertebrate Paleontology Annual Meeting.
DeMers, A., and J. Hunter. 2021. Inferring archaic ungulate diets using two-dimensional dentary morphology. Society of Vertebrate Paleontology Annual Meeting.
DeMers, A., and J. Hunter. 2019. Compatibility of the patterning cascade model of tooth development with periptychid “condylarth” molar diversity. Society of Vertebrate Paleontology Annual Meeting.
Guangwei Ding
Guangwei Ding
Professor of Chemistry
Jewett Science Center 220
- 605-626-3167
Postdoc. South Dakota State University
Ph.D University of Massachusetts at Amherst
MSc. University of London
DIC. University of London
MSc. Beijing Agricultural University
BSc. Shanxi Agricultural University
Dr. Guangwei Ding joined Northern's chemistry department in 2005. He has served on the editorial boards for the Scientific World Journal and the Journal of Experimental Chemistry, and as a reviewer for Geoderma, Chemosphere, and Organic Geochemistry.
Courses Taught
Chemistry Survey
General Chemistry I
General Chemistry II
Analytical Chemistry
Physical Chemistry I
Physical Chemistry II
Inorganic Chemistry
Environmental Chemistry
Research interests/expertise
Identifying the structure of Natural Organic Matter (NOM) by using solid-state C-13 nuclear magnetic resonance, infrared spectroscopic techniques, and remote sensing techniques
Studying the sorption/desorption behavior of hydrophobic organic compounds to natural organic matter
Understanding the hysteresis and the sorption mechanisms
Applying spectroscopic technique and remote sensing approach to monitor the plant physiological property
Assessing the carbon sequestration associated with global change and policy
Selected Publications
Junjian Li, Z. Xin, J. Yan, H. Li, J. Chen and G. Ding. 2018. "Physicochemical and microbiological assessment of soil quality on a chronosequence of a mine reclamation site." European Journal of Soil Science, 2018. doi: 10.1111/ejss.12714.
Meichen Feng, Xiaoli Guo, Chao Wang, Wude Yang, Chaochao Shi, Guangwei Ding, Xueru Zhang, Lujie Xiao, Meijun Zhang, Xiaoyan Song. 2018. "Monitoring and evaluation in freeze stress of winter wheat (Triticum aestivum L.) through canopy hyperspectrum reflectance and multiple statistical analysis." Ecological Indicators 84 (2018) 290–297. http://dx.doi.org/10.1016/j.ecolind.2017.08.059.
Zhanjin Xue, Zuodong Qin, Fangqin Cheng, Guangwei Ding, Hongjian Li. 2017. "Quantitative assessment of aeolian desertification dynamics--A case study in north Shanxi of China (1975 to 2015)." Scientific Reports | 7: 10460 | DOI:10.1038/s41598-017-11073-8.
Chao WANG, Mei-chen FENG, Wu-de YANG, Guang-wei DING, Lu-jie XIAO, Guang-xin LI, Ting-ting LIU. 2017. "Extraction of Sensitive Bands for Monitoring the Winter Wheat (Triticum aestivum) Growth Status and Yields Based on the Spectral Character." PLOS ONE. 2017. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0167679.
Xing-Xing Qiao, Chao Wang, Mei-Chen Feng, Wu-De Yang, Guang-Wei Ding, Hui Sun, Zhuo-Ya Liang, Chao-Chao Shi. 2017. "Hyperspectral estimation of soil organic matter based on different spectral pre-processing methods." SPECTROSCOPY LETTERS 2017, VOL. 50, NO. 3, 156–163. http://dx.doi.org/10.1080/00387010.2017.1297958.
Amy Dolan
Amy Dolan
Associate Professor of Biology/STEM Outreach Coordinator
Jewett Science Center 121
- 605-626-2620
Ph.D. Portland State University
B.A. University of Oregon
Dr. Amy Dolan joined Northern's faculty in 2018. She grew up on a homestead in Nikiski, Alaska. Dr. Dolan attended the University of Oregon and graduated with a bachelor's degree in biology and Spanish. She went on to earn a Ph.D. in biology at Portland State University, studying genetics, reproductive biology, mate choice, and reproductive success of eastern kingbirds. Dr. Dolan lives on a farm with her husband Ryan, and their three children: Oliver, Ruthie, and Zet.
Courses Taught
Biology Survey
General Biology
Environmental Biology
Human Biology
Anatomy
Gross Anatomy
Bioethics
Hematology
Histology
Publications
Christopher M, Chutter, Lucas J. Redmond, Nathan W. Cooper, Amy C. Dolan, Deborah Duffield, and Michael T. Murphy. "Paternal behaviour in a socially monogamous but sexually promiscuous passerine bird." BEHAVIOUR, 153: 443-466, APR 2016.
Cooper NW, Murphy MT, Redmond LJ, Dolan AC. "Reproductive correlates of spring arrival date in the Eastern Kingbird Tyrannus tyrannus." JOURNAL OF ORNITHOLOGY, 152 (1): 143-152, JAN 2011.
Redmond LJ, Murphy MT, Dolan AC, Sexton K. "Parental investment theory and nest defense by Eastern Kingbirds." WILSON JOURNAL OF ORNITHOLOGY, 121 (1): 1-11, MAR 2009.
Dolan AC, Murphy MT, Redmond LJ, Duffield D. "Maternal characteristics and the production and recruitment of sons in the eastern kingbird (Tyrannus tyrannus)." BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY, 63 (10): 1527-1537, AUG 2009.
Cooper NW, Murphy MT, Redmond LJ, Dolan AC. "Density-dependent age at first reproduction in the eastern kingbird." OIKOS, 118 (3): 413-419, MAR 2009.
Redmond LJ, Murphy MT, Dolan AC, Sexton K. "Public information facilitates habitat selection of a territorial species: the eastern kingbird." ANIMAL BEHAVIOUR, 77 (2): 457-463, FEB 2009.
Davuluri G, Gong WL, Yusuff S, Lorent K, Muthumani M, Dolan AC, Pack M. "Mutation of the Zebrafish Nucleoporin elys Sensitizes Tissue Progenitors to Replication Stress." PLOS GENETICS, 4 (10): Art. No. e1000240, OCT 2008.
Murphy MT, Sexton K, Dolan AC, Redmond LJ. "Dawn song of the eastern kingbird: an honest signal of male quality?" ANIMAL BEHAVIOUR, 75: 1075-1084, MAR 2008.
Yee NS, Gong W, Huang Y, Lorent K, Dolan AC, Maraia RJ, Pack M. "Mutation of RNA pol III subunit rpc2/polr3b leads to deficiency of subunit Rpc11 and disrupts zebrafish digestive development" PLOS BIOLOGY, 5 (11): 2484-2492, NOV 2007.
Sexton K, Murphy MT, Redmond LJ, Dolan AC. "Dawn song of eastern kingbirds: intrapopulation variability and sociobiological correlates." BEHAVIOUR, 144: 1273-1295, OCT 2007.
Dolan AC, Murphy MT, Redmond LJ, Sexton K, Duffield D. "Extrapair paternity and the opportunity for sexual selection in a socially monogamous passerine." BEHAVIORAL ECOLOGY, 18 (6): 985-993, NOV-DEC 2007.
Redmond, LJ; Murphy, MT; Dolan, AC. "Nest reuse by Eastern Kingbirds: Adaptive behavior or ecological constraint?" CONDOR, 109 (2): 463-468, MAY 2007.
Wallace KN, Dolan AC, Seiler C, Smith EM, Yusuff S, Chaille-Arnold L, Judson B, Sierk R, Yengo C, Sweeney HL, Pack M. "Mutation of smooth muscle myosin causes epithelial invasion and cystic expansion of the zebrafish intestine." DEVELOPMENTAL CELL, 8 (5): 717-726, MAY 2005.
John Long
Associate Professor of Environmental Physics/Chair, Department of Science and Mathematics
- 605-626-2629
John Long
John Long
Associate Professor of Environmental Physics/Chair, Department of Science and Mathematics
Jewett Science Center 224
- 605-626-2629
Ph.D. Montana State University
M.S. Montana State University
B.S. State University of New York
Dr. John Long joined the NSU faculty in the summer of 2015. He has a bachelor’s degree in applied mathematics from the State University of New York, a master’s degree in environmental and ecological statistics and a Ph.D. in ecology and environmental sciences, both from Montana State University. His area of expertise is the mathematical and physical aspects of the environment.
Dr. Long is a part of the SEA-PHAGES team trained by Howard Hughes Medical Institute to discover new viruses in environmental samples and to sequence their genome. Dr. Long is a retired U.S. Air Force major with 21 years of service as a B-52 electronic warfare officer.
Courses Taught
Introduction to Physics I and II
University Physics I and II
Biological Statistics I and II
R Programming
Geographic Information Systems (GIS) I and II
Remote Sensing
Biogeography
Research Interests
My research interests are focused on investigating environmental and ecological systems, primarily from a physical or mathematical perspective. In most cases, my research is methodological in nature, concentrating on the development of new analytical tools and methods.
Publications (peer-reviewed)
Long, J.A. & Stoy, P.C. (2018). Tornado Seasonality in the Southeastern United States. Weather & Climate Extremes, 20, 81-91. [doi: 10.1016/j.wace.2018.03.002].
Long, J.A. & Lawrence, R.L. (2016). Mapping percent tree mortality due to Mountain Pine Beetle damage. Forest Science, 62(4), 392–402. [doi: 10.5849/forsci.15-046].
Long, J.A. & Stoy, P.C. (2014). Peak tornado activity is occurring earlier in the heart of “Tornado Alley”. Geophysical Research Letters, 41, 6259–6264. [doi:10.1002/2014GL061385].
Long, J.A., Lawrence, R.L., Miller, P.R., Marshall, L.A., & Greenwood, M.C. (2014). Adoption of cropping sequences in northeast Montana: A spatio-temporal analysis. Agriculture, Ecosystems and Environment, 197, 77–87. [doi: 10.1016/j.agee.2014.07.022].
Porter, T.F., Chen, C, Long, J.A., Lawrence, R.L. & Sowell, B.F. (2014). Estimating biomass on CRP pastureland: A comparison of remote sensing techniques. Biomass and Bioenergy, 66, 268–274. [doi: 10.1016/j.biombioe.2014.01.036].
Long, J.A., Lawrence, R.L., Marshall L., & Miller, P.R. (2014). Changes in field-level cropping sequences: Indicators of shifting agricultural practices. Agriculture, Ecosystems and Environment, 189, 11–20. [doi: 10.1016/j.agee.2014.03.015].
Long, J.A, Lawrence, R.L., Greenwood, M.C., Marshall, L. & Miller, P.R. (2013). Object-oriented crop classification using multitemporal ETM+ SLC-off Imagery and Random Forest. GIScience and Remote Sensing, 50(4), 418–436. [doi: 10.1080/15481603.2013.817150].
Beever, E.A., Dobrowski, S.Z., Long, J. Mynsberge, A.R., & Piekielek, N.B. (2013). Understanding relationships among abundance, extirpation, and climate at ecoregional scales. Ecology, 94(7), 1563–1571. [doi: 10.1890/12-2174.1].
Long, J.A. & Stoy, P.C. (2013). Quantifying the periodicity of Heinrich and Dansgaard-Oeschger events during Marine Isotope Stage 3. Quaternary Research, 79(3), 103–113. [doi: 10.1016/j.yqres.2013.02.003].
Other Publications
Lawrence, R.L., Savage, S., Bode, E. & Long, J.A. (2019). Manual for Remote Sensing Image Analysis in R: Including Agnostic Image Analysis, Version 2. © AmericaView.
Lawrence, R.L., Savage, S., Bode, E. & Long, J.A. (2017). Manual for Remote Sensing Image Analysis in R: Including Agnostic Image Analysis. © AmericaView.
GENBANK Submissions
Coleman,S.T., Adewumi,O.M., Alachi,P., Anderson,S.J., Bakarey,A.S., Beyer,A.R., Biederman,W.H., Bollivar,D.W., Butela,K.A., Byrum,C.A., Collins,D.P., Cresawn,S.G., Dougan,K.E., Duffy,I., Eivazova,E.R., Engstrom,E.M., Fallest-Strobl,P.C., Godde,J.S., Lee,J.S., Long,J.A., Mastrapaolo,M.D., Mathur,V., Mesich,B.L., Mitchell,J.C., Moore,R., Pandey,S., Pollack,M.J., Porter,M.L., Reid,N.M., Salvitti,L.R., Sayre,B.L., Schrock,T.A., Sconiers,W.B., Sheehy,R., Shows,K.H., Sprenkle,A.B., Swerdlow,S.J., Theoret,J.R., Thompson,K.M., Tibbetts,T.J., Tigges,M., Van,A.R., Washington,J.M., Windsor,E.J., Garlena,R.A., Russell,D.A., Pope,W.H., Jacobs-Sera,D. & Hatfull,G.F. (2019). Microbacterium phage ArMaWenm, complete cds. Direct submission, GenBank Accession no. MK308638.
Lauer,M.J., Adewumi,O.M., Alachi,P., Anderson,S.J., Bakarey,A.S., Beyer,A.R., Biederman,W.H., Bollivar,D.W., Butela,K.A., Byrum,C.A., Caughron,J.E., Coleman,S.T., Collins,D.P., Cresawn,S.G., Dougan,K.E., Duffy,I., Eivazova,E.R., Engstrom,E.M., Fallest-Strobl,P.C., Godde,J.S., Gogarten,J.P., Hammer,B.W., Heller,D.M., Lee,J.S., Leonard,J.E., Long,J.A., Mastrapaolo,M.D., Mathur,V., Mesich,B.L., Mitchell,J.C., Moore,R., Pandey,S., Pollack,M.J., Popolizio,T.R., Porter,M.L., Reid,N.M., Salvitti,L.R., Sayre,B.L., Schrock,T.A., Sconiers,W.B., Sheehy,R., Shows,K.H., Sprangers,S.A., Sprenkle,A.B., Swerdlow,S.J., Theoret,J.R., Thompson,K.M., Tibbetts,T.J., Tigges,M., Van,A.R., Washington,J.M., Windsor,E.J., Wingfield,D.L., Yoon,E.J., Garlena,R.A., Russell,D.A., Pope,W.H., Jacobs-Sera,D. & Hatfull,G.F. (2019). Microbacterium phage Schubert, complete cds. Direct submission, GenBank Accession no. MK308637.
Conference Presentations
Long, J.A. (2018). The Undergraduate Landscape: Demographics in the Upper Midwest and the Search for Students. Annual Conference of the Great Plains Sociological Association, 17–19 Oct 2018.
Kiesow, A., Long, J., Anderson, C., Eduful, J., Miskimins, R., Podhradsky, A., Redlin, M., Surovek, A., & Tolman, E. (2018). South Dakota Working in STEM for Equity (SD-WISE): A System, Institutional, and Individual Level Approach to Policy Change. Annual Conference of the Great Plains Sociological Association, 17–19 Oct 2018.
Lawrence, R., Savage, S., Long, J., Bode, E., Squires, J. & Olson, L. (2016). Beyond Forest Classification: Continuous Mapping of Forest Species Composition, Mortality, and Sub-Canopy Using Landsat Imagery and Agnostic Analysis. American Geophysical Union, 2016 Fall Meeting, Dec 12–16, 2016.
Long, J.A. & Lawrence, R.L. (2015). Mapping Percent Tree-Mortality Due to Mountain Pine Bark Beetle-Damage, IGTF 2015 (Imaging and Geospatial Technology Forum), 4–8 May 2015.
Long, J.A., Lawrence, R.L., Miller, P.R., Greenwood, M. C., & Marshall, L. (2014). Using Genetic Sequencing Algorithms and Object-Oriented Multitemporal Satellite Image Analysis for Long-Term Change Characterization, William T. Pecora Memorial Remote Sensing Symposium (ASPRS 2014 Pecora 19 Symposium), 17–20 Nov 2014.
Long, J.A., Lawrence, R.L., Marshall, L. & Miller, P.R. (2014). Mapping Changes in Crop Rotation Sequences: Merging Remote Sensing and GIS, MAGIP (Montana Association of Geographic Information Professionals) Intermountain Conference, 7–11 Apr 2014.
Long, J.A., Lawrence, R.L., Marshall, L. & Miller, P.R. (2014). Applying String Matching Algorithms to Multitemporal Satellite Imagery to Identify Crop Rotation Patterns, ASPRS (American Society for Photogrammetry and Remote Sensing) Annual Conference, 23–27 Mar 2014.
Porter, T.F., Chen, C, Long, J.A., Lawrence, R.L. & Sowell, B.F. (2013). Comparison of Three Remote Sensing Techniques to Predict Above Ground Plant Biomass Production, Society for Range Management 66th Annual Meeting, February 2–8, 2013.
Beever, E.A., Dobrowski, S.Z., Long, J., Mynsberge, A.R. & Piekielek, N.B. (2011). Landscape-Scale Conservation and Management of Montane Wildlife: Contemporary Climate may be Changing the Rules, American Society of Mammalogists and Australasian Mammal Society, Joint Meeting, Jun 24–28, 2011.
Beever, E.A., Dobrowski, S.Z., Long, J., Mynsberge, A.R. & Piekielek, N.B. (2011). Landscape-scale Conservation and Management of Montana Wildlife: Is Contemporary Climate Creating No-Analog Dynamics for Wildlife?, The Wildlife Society Conference, Nov 22–25, 2011.
Jon Mitchell
Jon Mitchell
Professor of Biochemistry
Jewett Science Center 225
- 605-626-2458
George Nora
George Nora
Associate Professor of Chemistry/Safety Officer
Jewett Science Center 217
- 605-626-2471
Dr. George Nora began at Northern State University in 2010 and has been promoted to associate professor of chemistry.
Courses Taught
Organic Chemistry
Eric Pulis
Eric Pulis
Associate Professor of Biology, Coordinator of Student Research
Jewett Science Center 123
- 605-626-2600
Ph.D. University of Southern Mississippi
M.S. University of North Dakota
B.S. University of North Dakota
Dr. Eric Pulis joined Northern's faculty in 2018. Originally from central Minnesota, he attended the University of North Dakota, where he received his B.S. in fisheries and wildlife biology and his M.S. in biology. Dr. Pulis earned his Ph.D. at the University of Southern Mississippi's Gulf Coast Research Laboratory in Coastal Sciences, where his research focused on the taxonomy and systematics of some parasitic flat worms found in fishes. He is currently the advisor for the NSU Environmental Club.
Research Interests
Dr. Pulis's primary research interests are in the ecology, evolution, and diversity of parasites of wildlife and fishes. A large part of the work he does involves describing new species and making phylogenetic hypotheses about the relationships among species using a combination of field, microscopy, and molecular methods. Dr. Pulis has also worked on the conservation and ecology of marine mammals and turtles.
Courses Taught
Invertebrate Zoology
Vertebrate Zoology
General Biology II
Senior Seminar
Environmental Biology Labratory
Survey of Biology Labratory
Selected Publications
Pulis, E.E., Wells, R.S., Schorr, G.S., Douglas, D.C., Samuelson, M.M., Solangi, M. 2018. "Movements and dive patterns of pygmy killer whales (Feresa attenuata) release in the Gulf of Mexico following rehabilitation." Aquatic Mammals 44 (5).
Pitchford, J.L., Garcia, M., Pulis, E.E., Ambert, A.M., Heaton, A.J., Solangi, M. 2018. "Gauging the influence of increased search effort on reporting rates of bottlenose dolphin (Tursiops truncatus) strandings following the deepwater horizon oil spill." PloS One 13 (6), e0199214.
Heaton, A.J., Pulis, E.E., Pitchford, J.L., Hatchett, W.L., Carron, A.M., Solangi, M. 2016. "Prevalence and transience of ingested fishing hooks in Kemp’s Ridley sea turtles (Lepidochelys kempii)." Chelonian Conservation and Research. 15: 257-264.
Pitchford, J.L., Pulis, E.E., Evans, K., Shelley, J.K., Serafin, B.J.S., Solangi, M. 2016. "Seasonal bottlenose dolphin (Tursiops truncatus) density estimates in the Mississippi Sound from 2011 – 2013." Southeastern Naturalist. 15: 188-206.
Kudlai, O., Pulis, E.E., Kostadinova, A., Tkach, V.V. 2016. "Neopsilotrema n. g. (Digenea: Psilostomidae) and three new species from ducks (Anseriformes: Anatidae) in North America and Europe." Systematic Parasitology. 93: 307-319.
Greiman, S.E., Tkach, V.V., Pulis, E.E., Fayton, T.J., Curran, S.S. 2014. "Large scale screening of digeneans for Neorickettsia endosymbionts using real-time PCR reveals new Neorickettsia genotypes, host associations and geographic records including first reports from Australia and China." PLOS ONE. 9:1-9.
Pulis, E.E., Curran, S.S., Andres, M.J., Overstreet, R.M. 2014. "Change in rank of Megaperidae (Trematoda) to Megaperinae within the Apocreadiidae and description of Haintestinum amplum n. g., n. sp." Parasitology International. 63:269-274.
Pulis, E.E., Overstreet, R.M. 2013. "Review of haploporid (Trematoda) genera with ornate muscularisation in the region of the oral sucker, including four new species and a new genus." Systematic Parasitology. 84: 167-191.
Pulis E.E., Tkach V.V., Newman R.A. 2011. "Helminth parasites of the wood frog, Lithobates sylvaticus, in prairie pothole wetlands of the northern Great Plains." Wetlands 31: 675-685.
Kelly Pulis
Kelly Pulis
Biology Lab Manager
Jewett Science Center 120
- 605-626-3437
B.S. Biology, minor Psychology, University of North Dakota
A.A. Exotic Animal Training and Management, Moorpark College
Ms. Kelly Pulis, hailing from Vinton, Iowa, joined Northern in 2019 as biology lab manager.
Pagination