| effects of duvernoy's gland secretions from the eastern hognose snake, heterodon platirhinos, on smooth muscle and neuromuscular junction. | duvernoy's gland secretions (100 micrograms/ml) from the eastern hognose snake, heterodon platirhinos, induced a neuromuscular blockade in the isolated frog sciatic nerve-gastrocnemius muscle preparation and effectively antagonized acetylcholine and histamine responses of the rat duodenum preparation. the duvernoy's secretions (100 micrograms/ml) produced a reversible, excitatory effect in the guinea-pig ileum in vitro. mice administered the secretions (100 mg/kg, i.p.) exhibited minor, transien ... | 1992 | 1509497 |
| relict snakes of north america and their relationships within caenophidia, using likelihood-based bayesian methods on mitochondrial sequences. | this paper focuses on the phylogenetic relationships of eight north american caenophidian snake species (carphophis amoena, contia tenuis, diadophis punctatus, farancia abacura, farancia erytrogramma, heterodon nasicus, heterodon platyrhinos, and heterodon simus) whose phylogenetic relationships remain controversial. past studies have referred to these "relict" north american snakes either as colubrid, or as neotropical dipsadids and/or xenodontids. based on mitochondrial dna ribosomal gene sequ ... | 2004 | 15223038 |
| properties of duvernoy's secretions from opisthoglyphous and aglyphous colubrid snakes. | relatively little attention has been given to the biological properties of duvernoy's secretions produced by opisthoglyphous and some aglyphous colubrid snakes. a review is presented of literature pertaining to these secretions. most detailed analyses of duvernoy's secretions and their biological properties have been performed since the late 1970s. the dispholidines, dispholidus typus and thelotornis sp., and the natricines, rhabdophis tigrinus and r. subminiata, have received the most attention ... | 1994 | 7846688 |
| is there more than one way to skin a newt? convergent toxin resistance in snakes is not due to a common genetic mechanism. | convergent evolution of tetrodotoxin (ttx) resistance, at both the phenotypic and genetic levels, characterizes coevolutionary arms races between amphibians and their snake predators around the world, and reveals remarkable predictability in the process of adaptation. here we examine the repeatability of the evolution of ttx resistance in an undescribed predator-prey relationship between ttx-bearing eastern newts (notophthalmus viridescens) and eastern hog-nosed snakes (heterodon platirhinos). w ... | 2016 | 26374236 |
| presumptive granulocytic leukemia in a hognose snake (heterodon platirhinos). | | 2017 | 28075231 |
| a new host forcaryospora lampropeltis(apicomplexa: eimeriidae) from the eastern hognose snake,heterodon platirhinos(ophidia: colubroidea: dipsadinae), from arkansas, u.s.a., with a summary of hosts of this coccidian. | between may 2012 and july 2013, four eastern hognose snakes (heterodon platirhinos) were collected from arkansas (n= 2) and oklahoma (n= 2), u.s.a., and examined for coccidians. a singleh. platirhinosfrom arkansas was found to be passing oocysts ofcaryospora lampropeltisanderson, duszynski, and marquardt. oocysts ofc. lampropeltiswere spheroidal to slightly subspheroidal with a rough, colourless, bi-layered wall, measure 23.5 × 22.8 µm, and have a length/width (l/w) ratio of 1.0; both micropyle ... | 2015 | 27917072 |