Kristal, M.B.; Williams, C.L.
(1973). The effects of strain, reproductive condition
and strain of placenta donor, on placentophagia in
nonpregnant mice. Physiological Psychology,
1:354-356.
Kristal, M.B.; Graber, G.C.
(1976). Placentophagia in nonpregnant rats:
Influence of estrous cycle stage and birthplace.
Physiology & Behavior,
17:599-605.
Engwall, D.B.; Kristal, M.B.
(1977). Placentophagia in rats is modifiable by taste
aversion conditioning. Physiology & Behavior,
18:495-502.
Graber, G.C.; Kristal, M.B.
(1977). Uterine distention facilitates the onset of maternal
behavior in pseudopregnant but not in cycling rats. Physiology
& Behavior, 19:133-137.
Noonan, M.; Kristal, M.B. (1979).
The effects of medial preoptic lesions on placentophagia and
on the onset of maternal behavior in the rat. Physiology
& Behavior, 22:197-1202.
Kristal, M.B.; Steuer, M.A.;
Nishita, J.K.; Peters, L.C. (1980). Neophobia and water
intake after repeated pairings of novel flavors with
toxicosis. Physiology & Behavior, 24:979-982.
Kristal, M.B. (1980).
Placentophagia: A biobehavioral enigma (or De gustibus
non disputandum est). Neuroscience and
Biobehavioral Reviews, 4:141-150.
Kristal, M.B.; Whitney, J.F.;
Peters, L.C. (1981). Placenta on pups' skin
accelerates onset of maternal behaviour in nonpregnant rats.
Animal Behaviour, 29:81-85.
Kristal, M.B.; Peters, L.C.;
Franz, J.R.; Whitney, J.F.; Nishita, J.K.; Steuer, M.A.
(1981). Effect of pregnancy and stress on onset of
placentophagia in Long-Evans rats. Physiology
& Behavior, 27:591-595.
Kristal, M.B.; Nishita, J.K.
(1981). Observing birth and placentophagia affects
placentophagia but not maternal behavior of virgin
rats. Animal Learning and Behavior,
9:545-550.
Peters, L.C.; Kristal, M.B.
(1983). The suppression of infanticide in mother rats. Journal
of Comparative Psychology, 97:167-177.
Kristal, M.B.; Thompson, A.C.;
Grishkat, H.L. (1985). Placenta ingestion enhances opiate
analgesia in rats. Physiology & Behavior,
35:481-486.
Franz, J.R.; Leo, R.J.; Steuer,
M.A.; Kristal, M.B. (1986). Effects of hypothalamic knife
cuts and experience on maternal behavior in the rat. Physiology
& Behavior, 38:629-640.
Kristal, M.B.; Thompson, A.C.;
Heller, S.B.; Komisaruk, B.R. (1986). Placenta
ingestion enhances analgesia produced by vaginal/cervical
stimulation in rats. Physiology & Behavior,
36:1017-20.
Kristal, M.B.; Thompson, A.C.;
Abbott, P. (1986). Ingestion of amniotic fluid
enhances opiate analgesia in rats. Physiology &
Behavior, 38:809-815.
Steuer, M.A.; Thompson, A.C.;
Doerr, J.C.; Youakim, M.; Kristal, M.B. (1987). Induction of
maternal behavior in rats: Effects of pseudopregnancy
termination and placenta-smeared pups. Behavioral
Neuroscience, 101:219-227.
Peters, L.C.; Kristal, M.B.;
Komisaruk, B.R. (1987). Sensory innervation of the external
and internal genitalia of the female rat. Brain Research,
408:199-204.
Kristal, M.B.; Abbott, P.;
Thompson, A.C. (1988). Dose-dependent enhancement of
morphine-induced analgesia by ingestion of amniotic fluid
and placenta. Pharmacology, Biochemistry & Behavior,
31:351-356.
Doerr, J.C.; Kristal, M.B.
(1989). Enhancement of opioid-mediated analgesia by
ingestion of amniotic fluid: Onset latency and
duration. Physiology & Behavior,
46:913-915.
Kristal, M.B.; Thompson, A.C.;
Abbott, P.; DiPirro, J.M.; Ferguson, E.J.; Doerr, J.C.
(1990). Amniotic fluid ingestion by parturient rats enhances
pregnancy-mediated analgesia. Life Sciences,
46:693-698.
Kristal, M.B.; Tarapacki, J.A.;
Barton, D. (1990). Amniotic fluid ingestion enhances
opioid-mediated but not nonopioid-mediated analgesia.
Physiology & Behavior, 47:79-81.
Kristal, M.B. (1991) Enhancement
of opioid-mediated analgesia: A solution to the enigma of
placentophagia. Neuroscience and Biobehavioral Reviews,
15:425-435.
Thompson, A.C.; Abbott, P.;
Doerr, J.C.; Ferguson, E.J.; Kristal, M.B. (1991)
Amniotic-fluid ingestion before vaginal/cervical stimulation
produces a dose-dependent enhancement of analgesia and
blocks pseudopregnancy. Physiology & Behavior ,
50, 11-15.
Peters, L.C.; Sist, T.C.;
Kristal, M.B. (1991). Maintenance and decline of
infanticide-suppression in maternal rats. Physiology
& Behavior, 50:451-456.
DiPirro, J.M.; Thompson, A.C.;
Kristal, M.B. (1991) Amniotic-fluid ingestion enhances
the central analgesic effect of morphine. Brain Research
Bulletin, 26:851-855.
Doerr, J.C.; Kristal, M.B.
(1991) Amniotic-fluid ingestion enhances morphine
analgesia during morphine tolerance and withdrawal in rats.
Physiology & Behavior, 50:633-635.
Abbott, P.; Thompson, A.C.;
Ferguson, E.J.; Tarapacki, J.A.; Kostyniak, P.J.; Syracuse,
J.A.; Cartonia, D.M.; Kristal, M.B. (1991). Placental
opioid-enhancing factor (POEF): Generalizability of effects.
Physiology & Behavior, 50:933-940.
Tarapacki, J.A.; Thompson, A.C.;
Kristal, M.B. (1992). Gastric vagotomy blocks
opioid-analgesia enhancement produced by placenta ingestion.
Physiology & Behavior, 52:179-182.
Tarapacki, J.A.; Piech, M.;
Kristal, M.B. (1995). Ingestion of amniotic fluid by
postpartum rats enhances morphine analgesia without
liability to maternal behavior. Physiology &
Behavior, 57:209-212.
Robinson, T.M.; Abbott, P.;
Kristal, M.B. (1995) Blockade of digestion by
famotidine pretreatment does not interfere with the
opioid-enhancing effect of ingested amniotic fluid. Physiology
& Behavior, 57:261-263.
Thompson, A.C.; Kristal, M.B.
(1996). Opioid stimulation in the ventral tegmental area
facilitates the onset of maternal behavior in rats. Brain
Research, 743:184-201.
Horowitz, J.M.; DiPirro, J.M.; Kristal, M.B.;
Torres, G. (1997). Dopaminergic, glutamatergic but not
opioidergic mechanisms mediate induction of FOS-like protein
by cocaethylene. Brain Research Bulletin,
42:393-398.
Horowitz, J.M.; Kristal, M.B.; Torres, G.
(1997). Differential behavioral responses to
cocaethylene of Long-Evans and Sprague-Dawley rats: Role of
serotonin. Synapse, 26:11-21.
Robinson-Vanderwerf, T.M.; DiPirro, J.M.;
Caggiula, A.R.; Kristal, M.B. (1997). The
analgesia-enhancing component of ingested amniotic fluid does
not affect nicotine-induced antinociception in
naltrexone-treated rats. Pharmacology Biochemistry &
Behavior, 58:147-151.
Baumann, M.H.; Horowitz, J.M.; Kristal, M.B.;
Torres, G. (1998). Effects of cocaethylene on dopamine and
serotonin synthesis in Long-Evans and Sprague-Dawley brains. Brain
Research, 804:316-319.
Kristal, M.B. (1998):
Participation of Placental Opioid-Enhancing Factor in
opioid-modulated events at parturition. In invited
symposium: "Genital Sensation: CNS Target and Functions in
Females." On-line Proceedings of the 5th Internet World
Congress on Biomedical Sciences '98 at McMaster University,
Canada.
Corpening, J.W.; Doerr,
J.C.; Kristal, M.B. (2000). Ingested bovine
amniotic fluid enhances morphine antinociception in rats. Physiology
& Behavior, 70:15-18.
INVITED ARTICLE: Kristal, M.B.
(2000). "Anarchy Rules." The Buffalo News, Sunday,
June 18, 2000.
Martin, L.B.E.; Thompson, A.C.;
Martin, T.; Kristal, M.B. (2001). Analgesic efficacy of
orally administered buprenorphine in rats. Comparative
Medicine, 51:43-48.
Dodge, J.C.; Kristal, M.B.; Badura, L.L. (2002). Male-induced
estrus synchronization in the female Siberian hamster
(Phodopus sungorus sungorus). Physiology &
Behavior, 77:227-231.
DiPirro, J.M.; Kristal, M.B. (2004).
Placenta ingestion by rats enhances
delta- and kappa-
opioid antinociception, but suppresses mu-opioid
antinociception. Brain
Research, 1014:22-33.
Corpening, J.W.; Doerr, J.C.;
Kristal, M.B. (2004). Ingested placenta blocks the
effect of morphine on gut transit in Long-Evans rats. Brain Research,
1016:217-221.
Thompson, A.C.; Kristal, M.B.;
Sallaj, A.; Acheson, A.; Martin, L.B.E.; Martin, T.
(2004). Analgesic efficacy of oral buprenorphine in
rats: Methodological considerations. Comparative
Medicine, 54:293-300.
Kristal, Mark B. (2005). Advice
for Graduate Students: The 10 Suggestions for a
Basic-Research Career. IBNS Newsletter,
9(2).
INVITED ARTICLE: Kristal, M.B.
(2006). "Darwin Under Attack." The Buffalo News, Sunday, January 29,
2006.
Thompson, A.C.; DiPirro, J.M.;
Sylvester, A.R.; Martin, L.B.E.; Kristal, M.B. (2006).
Lack of analgesic efficacy in females of the commonly
recommended dose of oral buprenorphine. Journal of
the American Association for Laboratory Animal Science,
45:13-16.
INVITED ARTICLE: Kristal, M.B. (2009). The
biopsychology of maternal behavior in nonhuman mammals. ILAR Journal (Institute
for Laboratory Animal Research - NAS/NRC), 50:51-63.
Neumann,
A.; Hoey, R.F.; Daigler, L.B.; Thompson, A.C.;
Kristal, M.B. (2009). Ingestion
of amniotic fluid enhances the facilitative effect of
VTA morphine on the onset of maternal behavior in
virgin rats. Brain Research, 1261:29-36.
Curtin,
L.I.; Grakowsky, J.A.; Suarez, M.; Thompson,
A.C.; DiPirro, J.M.; Martin, L.B.E.; Kristal, M.B.
(2009). Evaluation of buprenorphine in a
post-operative pain model in rats. Comparative Medicine,
59:60-71.
Hoey,
R.F.; Hurley, S.W.; Daniels, D.; Kristal, M.B. (2011).
Effect of amniotic-fluid ingestion on
vaginal/cervical-stimulation-induced Fos expression in
female rats during estrus. Brain Research, 1376:51-59.
INVITED ARTICLE: Kristal, M.B.;
DiPirro, J.M.; Thompson, A.C. (2012). Placentophagia in
humans and nonhuman mammals: Causes and consequences. Ecology of
Food and Nutrition, 51: 177-197.
INVITED ARTICLE: Kristal M.B.
(2012). "Placenta: To Eat or Not to Eat?" The
Huffington Post.
Thompson,
A.C.; Feeney, C.; Kristal M.B. (2018). Amniotic-fluid
ingestion enhances central δ-opioid-induced hypoalgesia in
rats in the cold-water tail-flick assay in a
repeated-measures design. Brain Research,
1697: 53-58.
Kristal, M.B.; DiPirro, J.M.; Thompson, A.C.;
Wood, T.D. (2023). Placentophagia and the Tao of POEF. Neuroscience
& Biobehavioral Reviews, 145: 104992.
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