Featured Publications
Demas, G. E., & Nelson, R. J. (Eds.) (2011). Ecoimmunology. New York: Oxford University Press.
Photomicrographs of the olfactory bulb of female prairie voles featured on the cover of Hormones and Behavior, Volume 44 (2003).
Nelson, R. J., Demas, G. E., Klein, S. L., & Kriegsfeld, L. K. (2002). Seasonal Patterns of Stress, Immune Function, & Disease. Cambridge: Cambridge University Press.
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Publications
2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007| 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994
2022
Cusick, J. A., Wellman, C. L., & Demas, G. E. (2022). Maternal stress and the maternal microbiome have sex-specific effects on offspring development and aggressive behavior in Siberian hamsters (Phodopus sungorus). Hormones and Behavior, 141, 105146. PDF
Harshaw, C., Kojima, S., Wellman, C.L., Demas, G.E., Morrow, A.L., Taft, D.H., Kenkel, W.M., Leffel, J.K., Alberts, J.R. (2022). Maternal antibiotics disrupt microbiome, behavior, and temperature regulation in unexposed infant mice. Developmental Psychobiology, 22289. PDF
Munley, K. M., Dutta, S., Jasnow, A. M., & Demas, G. E. (2022). Adrenal MT1 melatonin receptor expression is linked with seasonal variation in social behavior in male Siberian hamsters. Hormones and Behavior, 138, 105099. PDF
Munley, K. M., Han, Y., Lansing, M. X., & Demas, G. E. (2022). Winter madness: Melatonin as a neuroendocrine regulator of seasonal aggression. Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, In Press. PDF
2021
Adaniya, C. H., Wellman, C. L., Demas, G. E., & Cusick, J. A. (2021). The ontogeny of personality: Repeatability of social and escape behaviors across developmental stages in Siberian hamsters (Phodopus sungorus). Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, 335, 564-571. PDF
Bailey, A. M., Hall, C. A., Legan, S. J., & Demas, G. E. (2021). Food restriction during development delays puberty but does not affect adult seasonal reproductive responses to food availability in Siberian hamsters (Phodopus sungorus). Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, 335, 691-702. PDF
Cusick, J. A., Wellman, C. L., & Demas, G. E. (2021). The call of the wild: Using non-model systems to investigate microbiome–behaviour relationships. Journal of Experimental Biology, 224, jeb224485. PDF
Munley, K. M., Trinidad, J. C., Deyoe, J. E., Adaniya, C. H., Nowakowski, A. M., Ren, C. C., Murphy, G. V., Reinhart, J. M., & Demas, G. E. (2021). Melatonin-dependent changes in neurosteroids are associated with increased aggression in a seasonally breeding rodent. Journal of Neuroendocrinology, 33, e12940. PDF
2020
Mishra, I., Pullum, K. B., Thayer, D. C., Plummer, E. R., Conkright, B. W., Morris, A. J., O’Hara, B. F., Demas, G. E., & Ashley, N. T. (2020). Chemical sympathectomy reduces peripheral inflammatory responses to acute and chronic sleep fragmentation. American Journal of Physiology: Regulatory, Integrative, and Comparative Physiology, 318, R781-R789. PDF
Munley, K. M., Deyoe, J. E., Ren, C. C., & Demas, G. E. (2020). Melatonin mediates seasonal transitions in aggressive behavior and circulating androgen profiles in male Siberian hamsters. Hormones and Behavior, 117, 104608. PDF
Ren, C. C., Sylvia, K. E., Munley, K. M., Deyoe, J. E., Henderson, S. G., Vu, M. P., & Demas, G. E. (2020). Photoperiod modulates the gut microbiome and aggressive behavior in Siberian hamsters. Journal of Experimental Biology, 223, jeb212548. PDF
Rendon, N. M., Petersen, C. L., Munley, K. M., Amez, A. C., Boyes, D. L., Kingsbury, M. A., & Demas, G. E. (2020). Seasonal patterns of melatonin alter aggressive phenotypes of female Siberian hamsters. Journal of Neuroendocrinology, 32, e12894. PDF
2019
Alberts, J. R., Harshaw, C., Demas, G. E., Wellman, C. L., & Morrow, A. L. (2019). The parent-offspring microbiome and neurobehavioral development. Behavioral and Brain Sciences, 42. PDF
2018
Jalabert, C., Munley, K. M., Demas, G. E., & Soma, K. K. (2018). Aggressive behavior. In P. Swanson & M.K. Skinner (Section Eds.), Encyclopedia of Reproduction (2nd ed., Volume 6: Comparative Reproduction). Amsterdam: Elsevier. PDF
Long, K. L. P., Bailey, A. M., Greives, T. J., Legan, S. J., & Demas, G. E. (2018). Endotoxin rapidly desensitizes the gonads to kisspeptin-induced luteinizing hormone release in male Siberian hamsters (Phodopus sungorus). Journal of Experimental Biology, 221, jeb185504. PDF
Munley, K. M., Rendon, N. M., & Demas, G. E. (2018). Neural androgen synthesis and aggression: Insights from a seasonally breeding rodent. Frontiers in Endocrinology, 9, 136. PDF
Ren, C., & Sylvia, K. E. (2018). Sexual dimorphism in the gut microbiome. Indiana University Journal of Undergraduate Research, 4, 12-16. PDF
Rossi, A., Parada, F. J., Stewart, R., Barwell, C., Demas, G. E., & Allen, C. (2018). Hormonal correlates of exploratory and play-soliciting behavior in domestic dogs. Frontiers in Psychology, 9, 1559. PDF
Sylvia, K. E., Deyoe, J. E., & Demas, G. E. (2018). Early-life sickness may predispose Siberian hamsters to behavioral changes following alterations of the gut microbiome in adulthood. Brain, Behavior, and Immunity, 73, 571-583. PDF | Commentary
Sylvia, K. E., Báez Ramos, P., & Demas, G. E. (2018). Sickness-induced changes in physiology do not affect fecundity or same-sex behavior. Physiology & Behavior, 184, 68-77. PDF
Sylvia, K. E., & Demas, G. E. (2018). A gut feeling: Microbiome-brain-immune interactions modulate social and affective behaviors. Hormones and Behavior, 99, 41-49. PDF
Sylvia, K. E., & Demas, G. E. (2018). Acute intraperitoneal lipopolysaccharide influences the immune system in the absence of gut dysbiosis. Physiological Reports, 6, e13639. PDF
Sylvia, K.E., Lorenz, T. K., Heiman, J. R., & Demas, G. E. (2018). Physiological predictors of leptin vary during menses and ovulation in healthy women. Reproductive Biology, 18, 132-136. PDF
2017
Ashley, N. T., & Demas, G. E. (2017). Neuroendocrine-immune circuits, phenotypes, and interactions. Hormones and Behavior, 87, 25-34. PDF
Bailey, A. M., Legan, S. J., & Demas, G. E. (2017). Exogenous kisspeptin enhances seasonal reproductive function in male Siberian hamsters. Functional Ecology, 31, 1220-1230. PDF
Bailey, A. M., Legan, S. J., Meretsky, V. J., & Demas, G. E. (2017). Effects of exogenous leptin on seasonal reproductive responses to interacting environmental cues in female Siberian hamsters. General and Comparative Endocrinology, 250, 95-103. PDF
Bowden, R. M., French, S. S., & Demas, G. E. (2017). Introduction to ecoimmunology: An integrative approach. Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, 327, 219-221. PDF
Carlton, E. D., & Demas, G. E. (2017). Glucose and insulin modulate sickness responses in male Siberian hamsters. General and Comparative Endocrinology, 242, 83-91. PDF
Ho, J. M., Bergeon Burns, C. M., Rendon, N. M., Rosvall, K. A., Bradshaw, H. B., Ketterson, E. D., & Demas, G. E. (2017). Lipid signaling and fat storage in the dark-eyed junco. General and Comparative Endocrinology, 247, 166-173. PDF
Lorenz, T. K., Demas, G. E., & Heiman, J. R. (2017). Partnered sexual activity moderates menstrual cycle-related changes in inflammation markers in healthy women: an exploratory observational study. Fertility and Sterility, 107, 763-773.
Lorenz, T. K., Heiman, J. R., & Demas, G. E. (2017). Testosterone and immune-reproductive tradeoffs in healthy women. Hormones and Behavior, 88, 122-130. PDF
Lorenz, T. K., Heiman, J. R., & Demas, G. E. (2017). Interactions among sexual activity, menstrual cycle phase, and immune function in healthy women. Journal of Sexual Research, 21, 1-9.
Rendon, N. M., Amez, A. C., Proffitt, M. R., Bauserman, E. R., & Demas, G. E. (2017). Aggressive behaviours track transitions in seasonal phenotypes of female Siberian hamsters. Functional Ecology, 31, 1071-1081. PDF
Sylvia, K. E., & Demas, G. E. (2017). Overcoming neonatal sickness: Sex-specific effects of sickness on physiology and social behavior. Physiology & Behavior, 179, 324-332. PDF
Sylvia, K. E., & Demas, G. E. (2017). A return to wisdom: Using sickness behaviors to integrate ecological and translational research. Integrative and Comparative Biology, 57, 1204-1213. PDF
Sylvia, K. E., Jewell, C. P., Rendon, N. M., St. John, E. A., & Demas, G. E. (2017). Sex-specific modulation of the gut microbiome and behavior in Siberian hamsters. Brain, Behavior, and Immunity, 60, 51-62. PDF
2016
Bailey, A. M., Rendon, N. M., O’Malley, K. J., & Demas, G. E. (2016). Food as a supplementary cue triggers seasonal changes in aggression, but not reproduction, in Siberian hamsters. Physiology & Behavior, 167, 298-308. PDF
Demas, G. E., & Jasnow, A. M. (2016). Empathy in prairie voles: Is this the consolation prize? Learning & Behavior, 44, 303-304. PDF
Demas, G. E., & Sylvia, K. E. (2016). There’s no place like biome: Can helminths restore the body’s ecosystem? Brain, Behavior, and Immunity, 51, 12-13. PDF
French, S. S., Chester, E. M., & Demas, G. E. (2016). Timing of Maternal Immunization Affects Immunological and Behavioral Outcomes of Adult Offspring in Siberian Hamsters (Phodopus sungorus). Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, 325, 377-389. PDF
Rendon, N. M., & Demas, G. E. (2016). Bi-directional actions of dehydroepiandrosterone and aggression in female Siberian hamsters. Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, 325, 116-121. PDF
Rendon, N. M., Soini, H. A., Scotti, M. A., Novotny, M.V., & Demas, G. E. (2016). Urinary volatile compounds differ across reproductive phenotypes and following aggression in male Siberian hamsters. Physiology & Behavior, 164, 58-67. PDF
Rendon, N. M., Soini, H. A., Scotti, M. A., Weigel, E. R., Novotny, M.V., & Demas, G. E. (2016). Photoperiod and aggression induce changes in ventral gland compounds exclusively in male Siberian hamsters. Hormones and Behavior, 81, 1-11. PDF
2015
Carlton, E. D., & Demas, G. E. (2015). Body mass affects seasonal variation in sickness intensity in a seasonally breeding rodent. Journal of Experimental Biology, 218, 1667-1676. PDF
Demas G. E., & Carlton, E. D. (2015). Ecoimmunology for psychoneuroimmunologists: Considering context in neuroendocrine–immune–behavior interactions Brain, Behavior, and Immunity, 44, 9-16. PDF
Lorenz, T. K., Heiman, J. R., & Demas, G. E. (2015). Sexual activity modulates shifts in TH1/TH2 cytokine profile across the menstrual cycle: an observational study. Fertility and Sterility, 104, 1513-1521. PDF
Lorenz, T. K., Demas, G. E., & Heiman, J. R. (2015). Interaction of menstrual cycle phase and sexual activity predicts mucosal and systemic humoral immunity in healthy women. Physiology & Behavior, 152, 92-98. PDF
Rendon, N. M., Keesom, S. M., Amadi, C., Hurley, L. M., & Demas, G. E. (2015). Vocalizations convey sex, seasonal phenotype, and aggression in a seasonal mammal. Physiology & Behavior, 152, 143-150. PDF
Rendon, N. M., Rudolph, L. M., Sengelaub, D. R., & Demas, G. E. (2015). The agonistic adrenal: melatonin elicits female aggression via regulation of adrenal androgens. Proceedings of the Royal Society B: Biological Sciences, 282, 1819. PDF
Scotti, M. A., Carlton, E. D., Demas, G. E., & Grippo, A. J. (2015). Social isolation disrupts innate immune responses in both male and female prairie voles and enhances agonistic behavior in female prairie voles (Microtus ochrogaster). Hormones and Behavior, 70, 7-13. PDF
Scotti, M. A., Rendon, N. M., Greives, T. J., Romeo, R. D., & Demas, G. E. (2015). Short-day aggression is independent of changes in cortisol or glucocorticoid receptors in male Siberian hamsters (Phodopus sungorus). Journal of Experimental Zoology Part A, 323, 331-341. PDF
Soma, K. K., Rendon, N. M., Boonstra, R., Albers, H. E., & Demas, G. E. (2015). DHEA effects on brain and behavior: insights from comparative studies of aggression. Journal of Steroid Biochemistry and Molecular Biology, 145, 261-272. PDF
2014
Bailey A. M., Demas G. E., & Kriegsfeld L. J. (2014). Biological Rhythms. Reference Module in Biomedical Sciences. Elsevier. PDF
Bergeon Burns, C. M., Rosvall, K. A., Hahn, T. P., Demas, G. E., & Ketterson, E. D. (2014). Examining sources of variation in HPG axis function among individuals and populations of the dark-eyed junco. Hormones and Behavior, 65, 179-187. PDF
Carlton, E. D., Cooper, C. L., & Demas, G. E. (2014). Metabolic stressors and signals differentially affect energy allocation between reproduction and immune function. General and Comparative Endocrinology, 208, 21-29. PDF
Carlton, E. D., & Demas, G. E. (2014). Leptin mediates seasonal variation in some but not all symptoms of sickness in Siberian hamsters. Hormones and Behavior, 66, 802-811. PDF
Downs, C. J., Adelman, J. S., & Demas, G. E. (2014). Mechanisms and methods in ecoimmunology: integrating within-organism and between-organism processes. Integrative and Comparative Biology, 54, 340-352. PDF
2013
French, S. S., Chester, E. M., & Demas, G. E. (2013). Maternal immune activation affects litter success, size and neuroendocrine responses related to behavior in adult offspring. Physiology & Behavior, 119, 175-184. PDF
Rynkiewicz, E. C., Hawlena, H., Durden, L. A., Hastriter, M. W., Demas, G. E., & Clay, K. (2013). Associations between innate immune function and ectoparasites in wild rodent hosts. Parasitology Research, 112, 1763-1770. PDF
2012
Bedrosian, T. A., Fonken, L. K., Demas, G. E., & Nelson, R. J. (2012). Photoperiod-dependent effects of neuronal nitric oxide synthase inhibition on aggression in Siberian hamsters. Hormones and Behavior, 61, 176-180. PDF
Carlton, E. D., Demas, G. E., & French, S. S. (2012). Leptin, a neuroendocrine mediator of immune responses, inflammation, and sickness behaviors. Hormones and Behavior, 62, 272-279. PDF
Ho, J. M., Smith, N. S., Adams, S. A., Bradshaw, H. B., & Demas, G. E. (2012). Photoperiodic changes in endocannabinoid levels and energetic responses to altered signalling at CB1 receptors in Siberian hamsters. Journal of Neuroendocrinology, 24, 1030-1039. PDF
Kojima, S., Stewart, R. A., Demas, G. E., & Alberts, J. R. (2012). Maternal contact differentially modulates central and peripheral oxytocin in rat pups during a brief regime of mother-pup interaction that induces a filial huddling preference. Journal of Neuroendocrinology, 24, 831-840. PDF
2011
Demas, G. E., Soma, K. K., & Albers, H. E. (2011). DHEA and Aggression. In R. R. Watson (Ed.), DHEA in Human Health and Aging. London: Taylor & Francis Group. PDF
Demas, G. E., & Nelson, R. J. (Eds.) (2011). Eco-Immunology. New York: Oxford University Press.
Demas, G. E., Zysling, D. A., Beecher, B., Muehlenbein, M. P., & French, S. S. (2011). Beyond phytohemagglutanin: assessment of vertebrate immune function across ecological contexts. Journal of Animal Ecology, 80, 710-730. PDF
French, S. S., Dearing, M. D., & Demas, G. E. (2011). Leptin as a physiological mediator of energetic trade-offs in eco-immunology. Integrative and Comparative Biology, 51, 505-513. PDF
Greives, T. J., Long, K. L., Burns, C. M., & Demas, G. E. (2011). Response to exogenous kisspeptin varies according to sex and reproductive condition in Siberian hamsters (Phodopus sungorus). General and Comparative Endocrinology, 170, 172-179. PDF
Ruiz, M., Wang, D., Reinke, E. A., Demas, G. E., & Martins, E. P. (2011). Trade-offs between reproductive coloration and innate immunity in a natural population of female sagebush lizards, Sceloperus graciosus. Herpetological Journal, 21, 131-134. PDF
2010
Chester, E. M., Banu, T., & Demas, G. E. (2010). Social defeat differentially affects immune responses in Siberian hamsters (Phodopus sungorus). Physiology & Behavior, 101, 53-58. PDF
Demas, G. E. (2010). In vivo but not in vitro leptin enhances lymphocyte proliferation in Siberian hamsters (Phodopus sungorus). General and Comparative Endocrinology, 166, 314-319. PDF
Demas, G. E., Adamo S. A., & French, S. S. (2010). Neuroendocrine-immune crosstalk in vertebrates and invertebrates: implications for host defence. Functional Ecology, 1-11. PDF
French, S. S., DeNardo, D., Greives, T. J., & Demas, G. E. (2010). Effects of tourism on endocrine and immune response of Galapagos marine iguanas. Hormones and Behavior, 58, 792-799. PDF
Garcia, N., Greives, T. J., French, S. S., Zysling, D. A., Chester, E. M., & Demas, G. E. (2010). Insulin increases adaptive immune response in short- but not long-day Siberian hamsters (Phodopus sungorus). Proceedings of the Royal Society B: Biological Sciences, 277, 2211-2218. PDF
Greives, T. J., French, S. S., Zysling, D. A., Garcia, N. W., & Demas, G. E. (2010). The glutamate agonist NMDA blocks gonadal regression and enhances antibody response to an immune challenge in the photoperiodic Siberian hamster (Phodopus sungorus). Journal of Comparative Physiology B, 180, 267-277. PDF
Ho, J. M., Murray, J. H., Demas, G. E., & Goodson, J. L. (2010). Vasopressin cell groups exhibit strongly divergence responses to copulation and male-male interactions in mice. Hormones and Behavior, 58, 368-377. PDF
Nelson, R. J., & Demas, G. E. (2010). Seasonal changes in immune function and disease. In S. Segerstrom (Ed.), The Oxford Handbook of Psychoneuroimmunology. New York: Oxford University Press. PDF
Ruiz, M., French, S. S., Demas, G. E., & Martins, E. P. (2010). Food supplementation and testosterone interact to influence reproductive behavior and immune function. Hormones and Behavior, 57, 134-139. PDF
2009
Demas, G. E., Weil, Z. M., & Nelson, R. J. (2009). Photoperiodism in mammals: Regulation of nonreproductive traits. In R. J. Nelson, D. L. Denlinger, & D. E. Somers (Eds.), Photoperiodism: The Biological Calendar. Oxford: Oxford University Press. PDF
French, S. S., Greives, T. J., Zysling, D., Chester, E. M., & Demas, G. E. (2009). Maternal leptin levels increase litter size and suppress immune response. Proceedings of the Royal Society B: Biological Sciences, 276, 4003-11. PDF
French, S. S., Moore, M. C., & Demas, G. E. (2009). Ecoimmunology: The organism in context. Integrative and Comparative Biology, 49, 246-53. PDF
Scotti, M. A., Newman, A. E.M, Schmidt, K. L., Bonu, T. N., Soma, K. K., & Demas, G. E. (2009). Aggressive encounters differentially affect circulating androgen levels in male Siberian hamsters (Phodopus sungorus). Hormones and Behavior, 56, 376-81. PDF
Zysling, D. A., Garst, A., & Demas, G. E. (2009). Photoperiod and food restriction stress differentially affects reproductive and immune responses in Siberian hamsters (Phodopus sungorus). Functional Ecology, 49, 246-53. PDF
2008
Durazzo, A., Proud, K., & Demas, G. E. (2008). Experimentally-induced sickness decreases food intake, but not hoarding in Siberian hamsters (Phodopus sungorus). Behavioural Processes, 79, 195-198. PDF
Freedberg, S., Grieves, T. J., Beecher, N., Ewert, M. A., Nelson, C., & Demas, G. E. (2008). Incubation environment affects immune system development in a turtle with environmental sex determination. Journal of Herpetology, 42, 536-541. PDF
Greives, T. J., Bentley, G. E., Kriegsfeld, L. J., & Demas, G. E. (2008). Recent advances in reproductive neuroendocrinology: A role for RFamide peptides in seasonal reproduction? Proceedings of the Royal Society B: Biological Sciences, 275, 1943-1951. PDF
Greives, T. J., Humber, S. A., Scotti, M. A., Demas, G. E., & Kriegsfeld, L. J. (2008). Photoperiod and gonadal steroids alter hypothalamic kisspeptin in the photoperiodic Siberian hamster (Phodopus sungorus). Journal of Neuroendocrinology, 20, 1-9. PDF
Greives, T. J., Kriegsfeld, L. J., & Demas, G. E. (2008). Exogenous kisspeptin does not alter photoperiod-induced gonadal regression in male Siberian hamsters (Phodopus sungorus). General and Comparative Endocrinology, 156, 552-558. PDF
Schubert, K.A, Lobke, M. V., Stavasius, F., Demas, G. E., Daan, S., & Henk, V. (2008). Female mice respond differently to costly foraging vs. food restriction. Journal of Experimental Biology, 211, 2214-2223. PDF
Scotti, M. A., Belén, J., Jackson, G. E., & Demas, G. E. (2008). The role of testosterone and DHEA in the mediation of seasonal territorial aggression in male Siberian hamsters (Phodopus sungorus). Physiology & Behavior, 95, 633-640. PDF
Soma, K. K., Scotti, M. A., Neuman, A., & Demas, G. E. (2008). Novel mechanisms of steroid regulation of aggression. Frontiers in Neuroendocrinology, 29, 476-489. PDF
2007
Demas, G. E., Albers, H. E., Cooper, M., & Soma, K. K. (2007). Novel mechanisms underlying neuroendocrine regulation of aggression: A synthesis of rodent, avian and primate studies. In J. D. Blaustein (Ed.), Handbook of Neurochemistry and Molecular Neurobiology: Behavioral Neurochemistry (3rd Ed.), Neuroendocrinology and Molecular Neurobiology. Boston: Springer. PDF
Greives, T. J., Mason, A. O., Scotti, M. A., Levine, J., Ketterson, E. D. Kriegsfeld, L. J., & Demas, G. E. (2007). Environmental control of kisspeptin: implications for seasonal reproduction. Endocrinology, 148, 1158-1566. PDF
Mason, A. O. Greives, T. J., Scotti, M-A. L., Levine, J., Ketterson, E. D., Demas, G. E., & Kriegsfeld, L. J. (2007). Suppression of kisspeptin expression and gonadotropic axis sensitivity following exposure to inhibitory day lengths in female Siberian hamsters. Hormones and Behavior, 52, 492-498. PDF
Scotti, M. A., & Demas, G. E. (2007). Photoperiodic changes in aggression are independent of gonadal steroids in female Siberian hamsters (Phodopus sungorus). Hormones and Behavior, 52, 183-190. PDF
Zysling, D. A., & Demas, G. E. (2007). Metabolic stress differentially affects humoral immunity in long- and short-day housed Siberian hamsters (Phodopus sungorus). Journal of Comparative Physiology B, 177, 339-347. PDF
2006
Greives, T. J., McGlothlin, J. W., Jawor, J. M., Demas, G. E., & Ketterson, E. D. (2006). Testosterone and immune function co-vary in a wild population of breeding dark-eyed juncos (Junco hyemalis). Functional Ecology, 20, 812-818. PDF
Nelson, R. J., Chiavegatto, S., Demas, G. E., & Trainor B. (2006). Pleiotropic contributions of neuronal nitric oxide synthase (NOS-1) to aggressive behavior. Neuroscience and Biobehavioral Reviews, 30, 346-355. PDF
Zysling, D. A., Greives, T. J., Breuner, C., Demas, G. E., & Ketterson, E. D. (2006). Behavioral and physiological responses to experimentally elevated testosterone in female dark-eyed juncos: implications for the evolution of sexual dimorphism. Hormones and Behavior, 50, 200-207. PDF
2005
Demas, G. E., & Sakaria, S. (2005). Leptin regulates energetic tradeoffs between body fat and humoural immunity. Proceedings of the Royal Society B: Biological Sciences, 272, 1845-1850. PDF
Faruzzi, A. N., Solomon, M. B., Demas, G. E., & Huhman, K. L. (2005). Gonadal hormones modulate the display of submissive behavior in socially defeated female Syrian hamsters. Hormones and Behavior, 47, 569-575. PDF
Grindstaff, J. L., Demas, G. E., & Ketterson, E. D. (2005). Dietary protein restriction affects egg size and number but does not reduce maternal antibody transfer in Japanese quail (Coturnix japonica). Journal of Animal Ecology, 74, 1051-1058. PDF
Nelson, R. J., Demas, G. E., & Chiavegatto, S. (2005). Nitric oxide and aggression. In R. J. Nelson (Ed.), Biology of Aggression. Oxford: Oxford University Press.
2004
Bartness, T. J., & Demas, G. E. (2004). Studies of food intake: Lessons
from nontraditionally studied species. In E. M. Stricker & S. Woods (Eds.), Handbook of Neurobiology, Vol. 14: Neurobiology of Food and Fluid Intake. New York: Kluwer Academic Press. PDF
Demas, G. E. (2004). Persistent photoperiodic effects on immune responsiveness: shedding light on immunity. American Journal of Physiology, 286, 18-19. PDF
Demas, G. E. (2004). The energetics of immunity: A neuroendocrine link between energy balance and immune function. Hormones and Behavior, 43, 75-80. PDF
Demas, G. E., Johnson, C., & Polacek, K. M. (2004). Social interactions differentially affect reproductive and immune responses in Siberian hamsters. Physiology & Behavior, 83, 73-79. PDF
Demas, G. E., & Kriegsfeld, L. J. (2004). Biological rhythms. In L. Martini (Ed.), Handbook of Endocrine Diseases. New York: Academic Press. PDF
Demas, G. E., Polacek, K. M., Durazzo, A., & Jasnow, A. M. (2004). Adrenal hormones mediate melatonin-induced increases in aggression in male Siberian hamsters (Phodopus sungorus). Hormones and Behavior, 46, 582-591. PDF
Nelson, R. J., & Demas, G. E. (2004). Seasonal patterns of stress and disease. Current Directions in Psychological Science, 13, 198-201. PDF
Wen, J., Hotchkiss, A., Demas, G. E., & Nelson, R. J. (2004). Photoperiod affects neuronal nitric oxide synthase and aggressive behavior in male Siberian hamsters (Phodopus sungorus). Journal of Neuroendocrinology, 16, 916-921. PDF
2003
Demas G. E., Bartness, T. J., Nelson, R. J., & Drazen, D. L. (2003). Photoperiod modulates the effects of norepinephrine on lymphocyte proliferation in Siberian hamsters. American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 285, R873-879. PDF
Demas, G.E, & Nelson, R. J. (2003). Lack of immunological responsiveness to photoperiod in a tropical rodent, Peromyscus aztecus hylocetes. Journal of Comparative Physiology B, 173, 171-176. PDF
Demas, G. E., Drazen, D. L., & Nelson, R. J. (2003). In vivo and in vitro norepinephrine suppresses cell-mediated immunity in Siberian hamsters (Phodopus sungorus). American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 285, R873-897. PDF
Demas G. E., Drazen, D. L., & Nelson, R. J. (2003). Reductions in total body fat decrease humoral immunity. Proceedings of the Royal Society of Sciences B: Biological Sciences, 270, 905-911. PDF
Kriegsfeld, L. J., Demas, G. E., Hotchkiss, A., Silverman, A. J., Silver, R., & Nelson, R. J. (2003). Brain mast cells are influenced by estrus induction in female prairie voles (Microtus ochrogaster). Hormones and Behavior, 44, 377-384. PDF
2002
Bartness, T. J., Demas, G. E., & Song, C. K. (2002). Seasonal changes in adiposity: the roles of the photoperiod, melatonin and other hormones, and sympathetic nervous system. Experimental Biology and Medicine 227: 363-376. PDF
Demas, G. E. (2002). Splenic denervation blocks leptin-induced enhancement of humoral immunity in Siberian hamsters (Phodopus sungorus). Neuroendocrinology, 76, 178-184. PDF
Demas, G. E., Bowers, R., Bartness, T. J., & Gettys, T. W. (2002). Photoperiodic regulation of gene expression in adipose tissue in Siberian hamsters (Phodopus sungorus). American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 282, R114-121. PDF
Demas, G. E., Drazen, D. L., Jasnow, A. J., Bartness, T. J. & Nelson, R. J. (2002). Sympathoadrenal system differentially affects photoperiodic changes in humoral immunity of Siberian hamsters (Phodopus sungorus). Journal of Neuroendocrinology, 14, 29-35. PDF
Drazen, D. L., Jasnow, A. J., Nelson, R. J., & Demas, G.E. (2002). Exposure to short days, but not short-term melatonin, enhances humoral immunity of male Syrian hamsters (Mesocricetus auratus). Journal of Pineal Research, 33, 118-124. PDF
Jasnow, A. J., Huhman, K. L., Bartness, T. J., & Demas, G. E. (2002). Short days and exogenous melatonin increase aggression of male Syrian hamsters (Mesocricetus auratus). Hormones and Behavior, 42, 13-20. PDF
Nelson, R. J., Demas, G. E., Klein, S. L., & Kriegsfeld, L. K. (2002). Seasonal Patterns of Stress, Immune Function and Disease. Cambridge: Cambridge University Press. PDF
2001
Bartness, T. J., Song, C. K., & Demas, G. E. (2001). SCN efferents to peripheral tissues: Implications for biological rhythms. Journal of Biological Rhythms, 16, 196-204. PDF
Demas, G. E., & Bartness, T. J. (2001). Direct innervation of white fat and adrenal medullary catecholamines mediate photoperiodic changes in body fat. American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 281, R1499-1505. PDF
Demas G. E., & Bartness, T. J. (2001). Novel method for localized, functional sympathetic nervous system denervation of peripheral tissue using guanethidine. Journal of Neuroscience Methods, 122, 21-28. PDF
Demas, G. E., El-Bakry, H. A., Mintz, E. M., Zahran, W. M., & Bartness, T. J. (2001). Wheel-running activity patterns of five species of desert rodents. Biological Rhythm Research, 32, 1-16. PDF
Drazen D. L., Demas G. E., & Nelson, R. J. (2001). Leptin effects on immune function and energy balance are photoperiod-dependent in Siberian hamsters (Phodopus sungorus). Endocrinology, 142, 2768-2775. PDF
Jasnow, A. J., Drazen, D.L, Nelson, R. J., Huhman, K. L., & Demas, G. E. (2001). Acute and chronic social defeat suppresses humoral immunity of male Syrian hamsters (Mesocricetus auratus). Hormones and Behavior, 40, 428-433. PDF
2000
Jasnow, A. M., Bartness, T. J., Huhman, K. L., & Demas, G. E. (2000). Short-day increases in aggression are inversely related to circulating testosterone concentrations in male Siberian hamsters (Phodopus sungorus). Hormones and Behavior, 38, 102-110. PDF
Sampei, K., Goto, S., Alkayed, N. J., Crain, B. J., Korach, K. S., Traystman, R. J., Demas, G. E., Nelson, R. J., & Hurn, P. D. (2000). Stroke in estrogen receptor-alpha-deficient mice. Stroke, 31, 738-743. PDF
1999
Demas, G. E., & Bartness, T. J. (1999). Effects of food deprivation and metabolic fuel utilization on food hoarding by jirds (Meriones shawi). Physiology & Behavior, 67, 243-248. PDF
Demas, G. E., Kriegsfeld, L. J., Poss, K. D., Tonegawa, S., & Nelson, R. J. (1999). Circadian locomotor rhythms in mice with targeted disruption of the gene for carbon monoxide synthesizing enzyme, heme oxygenase-2. Biological Rhythm Research, 30, 282-289.
Demas, G. E., Kriegsfeld, L. J., Blackshaw, S., Nelson, R. J., & Snyder, S. H. (1999). Elimination of aggressive behavior in male mice lacking endothelial nitric oxide synthase. Journal of Neuroscience, 19, RC30 (1-5). PDF
Demas, G. E., Moffatt, C. A., Drazen, D. L., & Nelson, R. J. (1999). Castration does not inhibit aggressive behavior in adult male prairie voles (Microtus ochrogaster). Physiology & Behavior, 66, 59-62. PDF
Kriegsfeld, L. J., Demas, G. E., Burnett, A. L., & Nelson, R. J. (1999). Ejaculatory abnormalities in mice lacking the gene for endothelial nitric oxide synthase (eNOS-/-). Physiology & Behavior, 67, 561-566. PDF
Kriegsfeld, L. J., Eliasson, M. J. L., Blackshaw, S., Demas, G. E., Nelson, R. J. & Snyder, S. H. (1999). Nocturnal motor coordination deficits in neuronal nitric oxide synthase knock-out mice. Neuroscience, 89, 311-315. PDF
Kriegsfeld, L. J., Demas, G. E., Dawson, T. M., Dawson, V. L., Snyder, S. H. & Nelson, R. J. (1999). Circadian locomotor analysis of male mice lacking the gene for neuronal nitric oxide synthase (nNOS-/-). Journal of Biological Rhythms, 14, 20-27. PDF
1998
Bentley, G. E., Demas, G. E., Nelson, R. J. & Ball, G. F. (1998). Melatonin, immune function, and reproductive state in male European starlings (Sturnus vulgaris). Proceedings of the Royal Society B: Biological Sciences, 265, 1191-1195. PDF
Burnett, A. L., Poss, K., Klein, S. L., Kriegsfeld, L. J., Demas, G. E., Calvin, D. C., Dawson, T. M., Nelson, R. J., Tonegawa, S., & Snyder, S. H. (1998). Ejaculatory abnormalities in mice with targeted disruption of the gene for heme oxygenase-2. Nature Medicine, 4, 84-87. PDF
Demas, G. E., & Nelson, R. J. (1998). Short-day enhancement of immune function is independent of steroid hormones in deer mice (Peromyscus maniculatus). Journal of Comparative Physiology B, 168, 419-426. PDF
Demas, G. E., & Nelson, R. J. (1998). Photoperiod, ambient temperature, and food availability interact to affect reproductive and immune function in adult male deer mice (Peromyscus maniculatus). Journal of Biological Rhythms, 13, 253-262. PDF
Demas, G. E., & Nelson, R. J. (1998). Exogenous melatonin enhances cell-mediated, but not humoral, immune function in adult male deer mice (Peromyscus maniculatus). Journal of Biological Rhythms, 13, 245-252. PDF
Demas, G. E., Johnson, C., & Nelson, R. J. (1998). Social, but not photoperiodic, influences on reproductive function in Peromyscus aztecus. Biology of Reproduction, 58, 385-389. PDF
Demas, G. E., Nelson, R. J., Yarowsky, P., & Kreuger, B. (1998). Impaired spatial working and reference memory in segmental trisomy (Ts65Dn) mice. Behavioural Brain Research, 90, 199-201. PDF
Nelson, R. J., Demas, G. E., & Klein, S. L. (1998). Photoperiodic mediation of seasonal breeding and immune function in rodents: A multi-factorial approach. American Zoologist, 38, 225-236. PDF
Walensky, L. D., Shi, Z. T., Blackshaw, S., DeVries, A. C., Demas, G. E., Gascard, P., Nelson, R. J., Conboy, J. G., Rubin, E. M., Snyder, S. H., & Mohandas, N. (1998). Neurobehavioral deficits in mice lacking the erythrocyte membrane cytoskeletal protein 4.1. Current Biology, 8, 1269-1272. PDF
1997
Demas, G. E., Chefer, V., Talan, M., & Nelson, R. J. (1997). Metabolic costs of mounting an antigen-stimulated antibody response in adult and aged C57BL/6J mice. American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 273, R1631-1637. PDF
Demas, G. E., DeVries, A. C., & Nelson, R. J. (1997). Effects of photoperiod and 2-deoxy-D-glucose-induced metabolic stress on immune function in female deer mice (Peromyscus maniculatus). American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 272, R1762-1767. PDF
Demas, G. E., Elliason, M. L., Dawson, T. M., Dawson, V. L., Kriegsfeld, L. J., Nelson, R. J., & Snyder, S. H. (1997). Inhibition of neuronal nitric oxide synthase increases aggressive behavior in mice. Molecular Medicine, 3, 610-616. PDF
Demas, G. E., Williams, J. M., & Nelson, R. J. (1997). Amygdala but not hippocampal lesions impair olfactory memory for mate in prairie voles (Microtus ochrogaster). American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 273, R1683-1689. PDF
DeVries, A. C., Gerber, J. M., Richardson, H. N., Moffatt, C. A., Demas, G. E. & Nelson, R. J. (1997). Stress affects corticosteroid and immunoglobulin concentrations in male house mice (Mus musculus) and prairie voles (Microtus ochrogaster). Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 118, 655-663. PDF
Nelson, R. J., & Demas, G. E. (1997). Role of melatonin in mediating seasonal energetic and immunologic adaptations. Brain Research Bulletin, 44, 423-430. PDF
1996
Burnett, A. L., Nelson, R. J., Calvin, D., Liu, J-X., Demas, G. E., Klein, S. L., Kriegsfeld, L. J., Dawson, T. M., & Snyder, S. H. (1996). Nitric oxide-dependent penile erection in mice lacking neuronal nitric oxide synthase. Molecular Medicine, 2, 288-296. PDF
Demas, G. E., Klein, S. L., & Nelson, R. J. (1996). Reproductive and immune responses to photoperiod and melatonin are linked in Peromyscussubspecies. Journal of Comparative Physiology A, 179, 819-825. PDF
Demas, G. E., & Nelson, R. J. (1996). Photoperiod and temperature interact to affect immune parameters in adult male deer mice (Peromyscus maniculatus). Journal of Biological Rhythms, 11, 95-103. PDF
Demas, G. E., Nelson, R. J., Kreuger, B. & Yarowsky, P. J. (1996). Spatial memory deficits in segmental trisomic Ts65Dn mice. Behavioural Brain Research, 81, 85-92. PDF
Nelson, R. J., Asfaw, B., DeVries, A. C., & Demas, G. E. (1996). Reproductive response to photoperiod affects corticosterone and immunoglobulin G levels in prairie voles (Microtus ochrogaster). Canadian Journal of Zoology, 74, 576-581. PDF
Nelson, R. J., & Demas, G. E. (1996). Seasonal changes in immune function. Quarterly Review of Biology, 71, 511-548. PDF
Nelson, R. J., Fine, J. B., Demas, G. E., & Moffatt, C. A. (1996). Photoperiod and population density interact to affect reproductive and immune function in male prairie voles. American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 270, R571-577. PDF
1995
Demas, G. E., & Brown, M. F. (1995). Honey bees are predisposed to win-shift but can learn to win-stay. Animal Behaviour, 50, 1041-1045. PDF
Nelson, R. J., Demas, G. E., Huang, P. L., Fishman, M. C., Dawson, V. L., Dawson, T. M., & Snyder, S. H. (1995). Behavioural abnormalities in male mice lacking neuronal nitric oxide synthase. Nature, 378, 383-386. PDF
Nelson, R. J., Demas, G. E., Klein, S. L., & Kriegsfeld, L. J. (1995). The influence of season, photoperiod and pineal melatonin on immune function. Journal of Pineal Research, 9, 149-165. PDF
1994
Brown, M. F., & Demas, G. E. (1994). Evidence for spatial working memory in honey bees (Apismellifera). Journal of Comparative Psychology, 108, 344-352. PDF
Demas Lab 