| [epidemiology of leishmaniasis in french guiana in relation to the existence of a new species of echimyid rodent, proechimys cuvieri sp. n]. | the rediscovery and reexamination of the skull of the type of proechimys guyannensis (e. geoffroy; 1803) allows us to give more details about this species. it appears that a new sympatric species, p. cuvieri, has to be distinguished, which could have great implications for the leishmaniosis epidemiology in french guiana. | 1978 | 102437 |
| distribution of histoplasma capsulatum in amazonian wildlife. | in a survey of 296 sylvatic animals captured from virgin forests in the north-eastern and south-western amazon of brazil, histoplasma capsulatum was isolated, via the indirect hamster inoculation method, from the liver and spleen of four common opossums didelphis marsupialis and two pacas agouti paca. the infected animals did not show any clinical symptoms or histopathology. the known amazonian mammalian species with natural histoplasmosis now total five, the previously reported species being th ... | 1985 | 3990770 |
| parasitic mites of surinam. vi. proradfordia guyannensis gen. nov., spec. nov. (myobiidae: trombidiformes) ex proechimys guyannensis (echimyidae: rodentia) | | 1973 | 4804193 |
| leishmaniasis in brazil: xx. prevalence of "enzootic rodent leishmaniasis" (leishmania mexicana amazonensis), and apparent absence of "pian bois" (le. braziliensis guyanensis), in plantations of introduced tree species and in other non-climax forests in eastern amazônia. | in amazonian brazil most human leishmaniasis is due to leishmania braziliensis s.l. and is acquired during the clearing of primary climax forest. one of the largest deforestation projects has taken place on the jari property where plantations of exotic tree species are grown for paper pulp. the ability of the regional leishmaniasis enzootics to invade plantations was investigated. cdc light-trap catches indicated the phletobomine vectors of le. b. guyanensis (causing "pian bois" in man) to be ve ... | 1983 | 6665830 |
| leishmaniasis in brazil: xvi. isolation and identification of leishmania species from sandflies, wild mammals and man in north para state, with particular reference to l. braziliensis guyanensis causative agent of "pian-bois". | a total of 125 wild mammals (14 different species) were examined for evidence of infection with leishmania in an area of primary forest highly endemic for "pian-bois", due to leishmania braziliensis guyanensis, in north pará state, brazil. parasites isolated were characterized biologically, and biochemically on enzymic profiles. l. b. guyanensis was isolated from the viscera of one lesser anteater (tamandua tetradactyla) and one opossum (didelphis marsupialis), and the skin of one rodent (proech ... | 1981 | 7324128 |
| the opossum, didelphis marsupialis (marsupialia: didelphidae), as a reservoir host of leishmania braziliensis guyanensis in the amazon basin of brazil. | a total of 52 opossums (six species) were examined for evidence of infection with leishmania in three different areas of forest near manaus, amazonas state, brazil. no infections were detected in 27 opossums from a region of relatively undisturbed forest, including specimens of didelphis marsupialis (18); metachirus nudicaudatus (four); monodelphis brevicaudata (one); marmosa cinerea (two); m. murina (one) and m. parvidens (one). of 15 d. marsupialis captured from a biological reserve, much dist ... | 1981 | 7324129 |
| the spiny rat proechimys guyannensis as model of resistance to epilepsy: chemical characterization of hippocampal cell populations and pilocarpine-induced changes. | at variance with pilocarpine-induced epilepsy in the laboratory rat, pilocarpine administration to the tropical rodent proechimys guyannensis (casiragua) elicited an acute seizure that did not develop in long-lasting status epilepticus and was not followed by spontaneous seizures up to 30 days, when the hippocampus was investigated in treated and control animals. nissl staining revealed in proechimys a highly developed hippocampus, with thick hippocampal commissures and continuity of the rostral ... | 2001 | 11457585 |
| amygdala kindling in proechimys guyannensis rat: an animal model of resistance to epilepsy. | this study examined the effect of amygdala kindling development in proechimys guayannensis rat, a common rodent of the amazon basin. | 2003 | 12558569 |
| raillietina demerariensis (cestoda), from proechimys cayennensis trinitatus of venezuela. | | 1953 | 13053311 |
| fos induction and persistence, neurodegeneration, and interneuron activation in the hippocampus of epilepsy-resistant versus epilepsy-prone rats after pilocarpine-induced seizures. | previous studies demonstrated that the spiny rat proechimys guyannensis exhibits resistance to experimental epilepsy. neural activation was studied in the proechimys hippocampus, using fos induction, within 24 h after pilocarpine-induced seizures; neurodegenerative events were investigated in parallel, using fluorojade b histochemistry. these parameters were selected since pilocarpine-induced limbic epilepsy is known to elicit immediate early gene expression and cell loss in the hippocampus of s ... | 2004 | 15382258 |
| newly recognized hantaviruses associated with hantavirus pulmonary syndrome in northern brazil: partial genetic characterization of viruses and serologic implication of likely reservoirs. | following the occurrence of the first laboratory-confirmed cases of hantavirus pulmonary syndrome (hps) in maranhao state, brazil, rodents were trapped and rodent materials screened by elisa for antibodies to sin nombre and andes hantaviruses. antibody-positive samples were tested by rt-pcr, amplified products were sequenced, and phylogenetic trees were constructed for comparison with known hantaviruses. from 104 rodent blood samples collected (40 bolomys lasiurus, 52 holochilus sciureus, 12 oli ... | 2005 | 15815145 |
| proechimys guyannensis: an animal model of resistance to epilepsy. | the potential interest of proechimys guyannensis (pg), a spiny rat species living in the amazonian region, as an animal model of anticonvulsant mechanisms, prompted the investigation of the susceptibility of this animal species to different epileptogenic treatments. | 2005 | 15987276 |
| long-term cosequences of intrahippocampal kainate injection in the proechimys guyannensis rodent. | the proechimys guyannensis (pg), a spiny rodent specie living in the amazonian region has been recently studied as an animal model of anti-convulsant mechanisms. the pg was found to be resistant to the administration of the muscarinic cholinergic agonist pilocarpine or the amygdala kindling development. this study examined the susceptibility of this animal species to the intrahippocampal kainic acid (ka) injection. electrographic, behavioral and neuropathological changes induced by intrahippocam ... | 2005 | 16084693 |
| gaba and opioid binding distribution in the brain of the seizure-resistant proechimys guyannensis: an autoradiography study. | proechimys guyannensis rodents present resistance to epilepsy. autoradiography was used to map gaba(a) ((3)h-muscimol), benzodiazepine ((3)h-flunitrazepam), mu ((3)h-damgo), and delta ((3)h-dpdpe) opioid receptor binding in adult proechimys guyannensis brain under normal conditions. results were compared with values obtained from adult wistar rats. proechimys presented reduced (3)h-muscimol binding in several cortices, thalamus, medial amygdala nucleus, and dorsal dentate gyrus. (3)h-flunitrazep ... | 2006 | 16847947 |
| different patterns of neuronal activation and neurodegeneration in the thalamus and cortex of epilepsy-resistant proechimys rats versus wistar rats after pilocarpine-induced protracted seizures. | to analyze cellular mechanisms of limbic-seizure suppression, the response to pilocarpine-induced seizures was investigated in cortex and thalamus, comparing epilepsy-resistant rats proechimys guyannensis with wistar rats. | 2009 | 19220411 |
| karyological analysis of proechimys cuvieri and proechimys guyannensis (rodentia, echimyidae) from central amazon. | the aim was to characterize the karyotype of rodents of the genus proechimys from three localities in the central brazilian amazon, in the search for new markers that might shed light on our understanding of the taxonomy and evolutionary history of this taxon. two karyotypes were found, viz., 2n = 28, fn = 46 in individuals from the nrsp (cuieiras river) and reman (manaus), and 2n = 46, fn = 50 in individuals from the balbina hydroelectric plant. while individuals with the karyotype with 2n = 28 ... | 2012 | 22481879 |
| duration of spermatogenesis and daily sperm production in the rodent proechimys guyannensis. | the spiny rat (proechimys guyannensis) is a neotropical rodent that is used in biomedical research, particularly research related to chronic resistance to epilepsy and infectious diseases. to our knowledge, there are few reports concerning the reproductive biology of this species. therefore, besides providing basic biometric and morphometric data, in the present study we investigated testis function and spermatogenesis in adult spiny rats. the mean testis weight and gonadosomatic index obtained ... | 2016 | 27306197 |
| characterization of the sleep-wake cycle of the neotropical rodent proechimys guyannensis. | to better understand the sleep-wake cycle characteristics in the female neotropical rodent proechimys guyannensis related to comparative neurobiology. | 2014 | 26770732 |
| characterization of the estrous cycle in the amazon spiny rat (proechimys guyannensis). | males of proechimys guyannensis, a rodent living in the amazon rainforest are studied in biomedical research because of their antiepileptogenic mechanism. females are usually taken from experimental designs, because of limited data of this sex. this study aimed to characterize the estrous cycle to include females together with males in research in a more balanced approach. the estrous cycle of p. guyannensis based through exfoliative cytology, determination of the vaginal occlusion membrane stat ... | 2019 | 31879712 |
| the role of pleistocene climate change in the genetic variability, distribution and demography of proechimys cuvieri and p. guyannensis (rodentia: echimyidae) in northeastern amazonia. | the spiny rats, genus proechimys, have the highest species richness within the echimyidae family, as well as species with high genetic variability. the genus distribution includes tropical south america and central america south to honduras. in this study, we evaluate the phylogeographic histories of proechimys guyannensis and p. cuvieri using cytochrome b, in a densely sampled area in northeastern amazon where both species are found in sympatry in different environments. for each species, bayes ... | 2018 | 30557386 |