Publications

Featured Publications

Ecoimmunology Book 2

Demas, G. E., & Nelson, R. J. (Eds.) (2011). Ecoimmunology. New York: Oxford University Press.

H&B 2004 Mast Cell Cover

Photomicrographs of the olfactory bulb of female prairie voles featured on the cover of Hormones and Behavior, Volume 44 (2003).

Seasonal Patterns Book 2

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

20202018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007| 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994

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.

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

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, 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, 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, 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, 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 graciosusHerpetological 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, 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, 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, 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, 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, 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, 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, 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 , 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, 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, 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, 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, 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, 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). Journal of Comparative Biochemistry and Physiology A, 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, 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

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