| on the hydroxylation of fluoran to form fluorescein by three species of gerbillinae (meriones unguiculatus. m. libycus and gerbillus pyramidum). | | 1979 | 43795 |
| helminths of birds and mammals of israel. viii.- skrjabinocapillaria rodentium n. sp. (nematoda capillariidae) from gerbillid and murid rodents. | skrjabinocapillaria rodentium n.sp., found in the stomach of meriones crassus, gerbillus pyramidum, g. gerbillus, g. dasyurus and acomys cahirinus, is described. it differs from the other two species in the genus, s. bakeri and s. eubursata, mainly in being larger, having a larger number of stichocytes and having a cephalic influation in the female and not in the male. | 1979 | 485042 |
| comparative histological and histochemical studies on the adrenal gland of the albino and the egyptian desert rats. | the adrenal gland of the albino rat and the egyptian desert rodents gerbillus pyramidum and gerbillus gerbillus was subject to histological and histochemical studies. compared to the albino rat, the adrenal gland of the egyptian desert rat had a thicker capsule, its zona glomerulosa was thinner and more vacuolated, its cortex was sharply demarcated from the medulla which appeared in the form of packets of cells. lipid droplets were larger and more numerous in the zona glomerulosa and no subglome ... | 1977 | 860639 |
| comparative study of the gastrocnemius and soleus muscles of the egyptian desert rodent gerbillus pyramidum and the albino rat. | the hind limb muscles of the egyptian desert rodent gerbillus pyramidum and the albino rat were studied macroscopically and microscopically, using ordinary and histochemical techniques. the results revealed a relatively long hind limb and a relatively long tendon of the gastrocnemius group in g. pyramidum as compared with the albino rat. the dark fibres (red) were dominant in the muscles of the former animal and its spindles similarly contained more dense intrafusal fibres than the spindles of t ... | 1975 | 1163200 |
| studies on flea fauna in el fayoum governorate, egypt. | this paper dealt with the studies of flea fauna as collected on the rodent hosts over one year. the collected rodents (499) in a descending order of abundance in the collection were rattus rattus, r. norvegicus, mus musculus, gerbillus pyramidum and arvicanthis niloticus. the collected fleas in a descending order in the collection were x. cheopis, p. irritans, n. jasciatus, c. felis, l. segnis and e. gallinacea. the total flea index reached the maximum (0.76) in may and it was zero in december a ... | 1992 | 1431297 |
| two successive years studies on phlebotomus papatasi in north sinai governorate, egypt. | no doubt, zoonotic cutaneous leishmaniasis (zcl) is increasing in north sinai governorate. the causative agent, l. major was identified as well as two animal reservoir hosts, gerbillus pyramidum and meriones crassus. this paper was intended to study the seasonal abundance and the sex ratio of the suspected insect, phlebotomus papatasi as well as to search for natural infected in wild caught females. the c.d.c. miniature light traps were used for adult collections, dissection was used for demonst ... | 1992 | 1578184 |
| gerbillus pyramidum is a host of leishmania major in the sinai peninsula. | | 1987 | 3503651 |
| [organ weight of gerbillus pyramidum geoffroy, 1825]. | | 1969 | 5349555 |
| [thyroxine and triiodothyronine protein complexes in serum of mesocricetus auratus and gerbillus pyramidum]. | | 1967 | 5589665 |
| [breeding and biology of the desert running mouse gerbillus pyramidum geoffroy 1825 in captivity]. | | 1968 | 5753440 |
| effect of heat stress on brain 5-hydroxytryptamine and 5-hydroxyindoleacetic acid in some vertebrate species. | 1. the variations in 5-ht and 5-hiaa levels following heat exposure and split heat doses were determined in the different brain regions of gerbillus pyramidum, streptopelia senegalensis aegyptiaca and agama stellio. 2. heat exposure was found to be associated with an increase in the levels of the two indole compounds. 3. the 5-ht concentrations increased markedly in the three species following the first heat dose and decreased following the second dose in the various brain regions except in the ... | 1982 | 6184194 |
| effect of cold exposure on brain 5-hydroxytryptamine and 5-hydroxyindoleacetic acid in some vertebrate species. | 1. the changes in 5-ht and 5-hiaa levels were studied in the brain regions of gerbillus pyramidum, streptopelia senegalensis aegyptiaca and agama stellio following exposure to cold. 2. in general, the 5-ht levels increased in the gerbillus brain parts and decreased in those of streptopelia. 3. cold exposure in the agama brain regions caused a transient decrease in the 5-ht levels of the cerebral hemispheres, midbrain and pons plus medulla after 6 hr and a general increase after 12, 24 and 48 hr. ... | 1982 | 6184195 |
| morphological description of androlaelaps lehfeni sp. nov (laelapinae, laelapidae) found in north sinai, egypt. | androlaelaps lehfeni sp. nov. collected from gerbillus pyramidum in beer lehfin, n. sinai, egypt. the female is described. apilus dentilis on the fixed digit of chelicera. the tarsus of palp with two tined apotele. tarsus of leg ii with 3 spurs ventralcind stout setae. genitoventral shield with one pair of ventral setae. the new species is compared with the related species in this genus. | 1995 | 7602175 |
| studies on zoonotic cutaneous leishmaniasis among a group of temporary workers in north sinai governorate, egypt. | leishmaniasis (cutaneous, cl. and visceral, vl.) is an increasing public health problem in the mediterranean region. from a practical point of view, zcl is the most important and distributed form in egypt. consequently, it was aimed to study the status of zcl among a group of temporary workers in north sinai governorate. the results showed that (i) rodent populations are more or less common in al arish city (rattus rattus and r. norvegicus), bir lehfan (gerbillus pyramidum) and abo oegela (g. py ... | 1995 | 7602176 |
| natural leishmania infections in two stray dogs and two gerbillus pyramidum in dakahlia governorate, egypt. | in egypt, zoonotic cutaneaus leishmaniasis (zcl) and infantile visceral leishmaniasis (i.vl.) have been documented. recently, in dakahlia governorate, three cases of indigenously acquired leishmaniasis (two vl. and one zcl) have been reported. this paper aimed to search for the animal reservoir (s) of these two types of zoonotic leishmaniasis. commensal and wild rodents as well as stray dogs were collected from concerned areas. their role as animal reservoirs were investigated parasitologically ... | 1994 | 8077758 |
| the fur mite listrophorus arishi: sp. nov. (listrophorinae, listrophoridae) of jerboes in north sinai, egypt. | a total of 1119 specimens of listrophoridus arishi sp. nov. collected from gerbillus pyramidum were found in beer lahfin, north sinai and described herein. three microscopic drawings of the ventral and dorsal views of the female and the ventral of male are provided. | 1994 | 8169439 |
| epidemiology of cutaneous leishmaniasis at a focus monitored by the multinational force and observers in the northeastern sinai desert of egypt. | a longitudinal epidemiologic study of cutaneous leishmaniasis (cl) transmission was conducted between july 1989 and june 1991 in a 1,200-km2 sector of the northeastern sinai desert monitored by the multinational force and observers (mfo), an international peace keeping mission between egypt and israel. the occurrence of human cases, sand fly density, rodent collection, and isolations of leishmania confirmed only one of four surveyed locations as a significant focus of cl transmission. phlebotomu ... | 1993 | 8250099 |
| studies on cutaneous leishmaniasis in el hasana center, north sinai, egypt. | the persistent of cutaneous leishmaniasis (cl) transmission mainly in sinai and one or two foci in the nile valley and the outbreak of cl. in nakhel center form the rationale for including leishmaniasis as one of the main health problems in egypt. in this paper, it was aimed to spot-light survey humans for cutaneous leishmaniasis in el hasana center, north sinai. also rodents were trapped from several towns and villages within the center to document the relative importance of the different speci ... | 1993 | 8308338 |
| leishmania major in meriones sacramenti thomas 1922 in nakhel, north sinai, egypt. | leishmania major is a protozoal parasite of desert and savanna rodents, the vectors being mainly phlebotomus (phlebotomus) papatasi and very closely related species. man in an incidental host, in whom usually it causes zoonotic cutaneous leishmaniasis. in this paper, spot light survey was carried out in nakhel to identify the role of animal reservoir(s) where a sudden outbreak occurred in nakhel center. the trapped rodents were m. musculus, meriones sacramenti and gerbillus pyramidum. three isol ... | 1993 | 8376854 |
| the seasonal abundance of gerbillus pyramidum and their flea ectoparasites in al arish, north sinai governorate, egypt. | the seasonal abundance and the flea ectoparasites of gerbillus pyramidum were studied. the results showed that the jerboa was more common in summer (jerboa index 0.43) and least common in winter (jerboa index 0.35). the overall male to female ratio was 4.2:1. the flea ectoparasites were more common in autumn (flea index 10.5) and least common in summer (flea index 6.8). the overall flea index was 8.75 and the majority of fleas (90.9%) was collected on male jerboa. the collected fleas in a descen ... | 1993 | 8482875 |
| identification of a misleading trypanosomatid parasite from gerbillus pyramidum and g. andersoni in a leishmania major endemic area in north sinai. | during an epidemiologic investigation of cutaneous leishmaniasis at a focus in north sinai, egypt, between june 1989 and december 1991, 897 desert rodents were trapped and examined to identify reservoir hosts for leishmania major. mixed forms of epimastigotes and promastigotes were isolated in tanabe's medium from 4 gerbillus pyramidum and 1 gerbillus andersoni. the 2 forms were later grown and separated as distinct cultures in schneider's medium. the isoenzyme profile of the gerbils' promastigo ... | 1996 | 8636842 |
| psammomys obesus cretzschmar, 1828 and zoonotic cutaneous leishmaniasis in sinai peninsula, egypt. | in the middle east, the fat sand rat psammomys obesus is the most important reservoir host of zoonotic cutaneous leishmamiasis (zcl). it is the most incriminated host in outbreaks. two p. obesus caught in wadi el gedeiret (al arish, north sinai) were found naturally infected with leishmania major as indicated by enzyme electrophoresis. in egypt, the already known reservoir hosts are gerbillus pyramidum i. geoffroy st. hilaire, 1825; meriones crassus sundevall, 1984 and meriones sacramenti thomas ... | 1996 | 8754646 |
| [differences in the transport of hormone iodine in mesocricetus auratus auratus and gerbillus pyramidum]. | | 1964 | 14274071 |
| studies on rodents role as reservoir hosts of leishmaniasis with specical reference to their ectoparasites in suez governorate. | the distribution of rodents was studied in three different habitats. seven rodent species were identified: rattus norvegicus, r. alexandrinus, r. frugivorous, mus musculus, acomys russatus, meriones sacramenti and gerbillus pyramidum. the species distribution varied with the habitat type. the highest density of rodents was in july and august and the lowest one was in january. however, some species were collected all the year round. the rodents were investigated for the endo- and ecto-parasites. ... | 2006 | 16605103 |
| helminths collected from imported pet murids, with special reference to concomitant infection of the golden hamsters with three pinworm species of the genus syphacia (nematoda: oxyuridae). | a total of 210 individuals of 13 species belonging to 4 subfamilies of muridae imported into japan as pets were examined; 5 species of syphacia (nematoda: oxyuridae), aspiculuris tetraptera (nematoda: heteroxynematidae), and rodentolepis nana (cestoidea: hymenolepididae) were collected. concurrent infection with 3 pinworm species, syphacia mesocriceti, syphacia stroma, and syphacia peromysci, was recorded for the first time in the golden hamster, mesocricetus auratus. syphacia mesocriceti was al ... | 2008 | 18605784 |
| first report of leishmania tropica from a classical focus of l. major in north-sinai, egypt. | cutaneous leishmaniasis (cl) is prevalent in the egyptian sinai peninsula and previous research has consistently documented the etiologic agent to be leishmania major. we report the first isolation of leishmania tropica from human cases of cl in a northern sinai community bordering palestine. parasite culturing, real-time polymerase chain reaction (pcr), gene sequencing, and restriction fragment length polymorphism (rflp) analyses indicate cl cases in this community were caused by either l. majo ... | 2009 | 19635872 |
| ecology of cutaneous leishmaniasis in sinai: linking parasites, vectors and hosts. | cutaneous leishmaniasis (cl) is a neglected clinical form of public health importance that is quite prevalent in the northern and eastern parts of egypt. a comprehensive study over seven years (january 2005-december 2011) was conducted to track cl transmission with respect to both sandfly vectors and animal reservoirs. the study identified six sandfly species collected from different districts in north sinai: phlebotomus papatasi, phlebotomus kazeruni, phlebotomus sergenti, phlebotomus alexandri ... | 2014 | 24821060 |
| natural and experimental evidence of viscerotropic infection caused by leishmania tropica from north sinai, egypt. | cutaneous leishmaniasis (cl) is a neglected clinical form that is quite prevalent in eastern north parts of the country in sinai peninsula. leishmania tropica was identified by previous reports as the causative agent responsible for viscerotropic infections in-patients and experimental animals. here, we reported the viscerotropic infections from naturally infected rodent gerbillus pyramidum floweri collected from north-sinai. footpad and tail lesions, spleenomegaly, and malformed dark-colored sp ... | 2014 | 25597157 |
| ectoparasitism and stress hormones: strategy of host exploitation, common host-parasite history and energetics matter. | parasites are thought to have numerous negative effects on their hosts. these negative effects may be associated with stress in a host. we evaluated the effects of four species of flea ectoparasites (parapulex chephrenis, synosternus cleopatrae, xenopsylla conformis and xenopsylla ramesis) on non-specific responses of eight species of rodents (meriones crassus, gerbillus dasyurus, gerbillus andersoni, gerbillus pyramidum, gerbillus nanus, acomys cahirinus, acomys russatus and mesocricetus auratu ... | 2014 | 24661039 |
| sex-biased parasitism, seasonality and sexual size dimorphism in desert rodents. | we investigated seasonality of gender differences in the patterns of flea infestation in nine rodent species to test if sex-biased parasitism in terms of mean abundance, species richness, prevalence and the level of aggregation (a) varies among hosts and between seasons, and (b) is linked to sexual size dimorphism. sexual size differences were significant in both summer and winter in acomys cahirinus, gerbillus pyramidum and meriones crassus, and in winter only in acomys russatus, gerbillus dasy ... | 2005 | 16025350 |
| photoperiodic responses of four wild-trapped desert rodent species. | the purpose of this study was to examine the effect of the photoperiod on reproductive status and body and lipid masses in four egyptian desert rodent species (dipodillus dasyurus, acomys cahirinus, gerbillus andersoni, and gerbillus pyramidum). adult males and females were housed in long days for 11 wk. at that time, one-half of the animals were killed and the remaining animals were moved to short days (sds) for 11 wk. some individuals of gerbillus andersoni and gerbillus pyramidum had access t ... | 1998 | 9843891 |
| monthly abundance of rodent and their ectoparasites in newly settled areas, east of lakes, ismailia governorate, egypt. | rodents and their ectoparasites were studied inside and outside houses in the newly settled areas, east of lakes, ismailia governorate, egypt. forty traps per month in each of the two sides were used for collecting rodent during 2009. from 221 rodent were collected from inside houses; mus musculus n=115 (52.04%), rattus rattus. frugivorous n=54 (24.43%), r. r. alexandrinus n=40 (18.10%) and r. norvegicus n=12 (5.43%). from 177 rodent were collected from outside houses; m musculus n=4 (2.3%), r. ... | 2013 | 24260816 |
| taxonomic hypotheses regarding the genus gerbillus (rodentia, muridae, gerbillinae) based on molecular analyses of museum specimens. | methodological improvements now allow routine analyses of highly degraded dna samples as found in museum specimens. using these methods could be useful in studying such groups as rodents of the genus gerbillus for which i) the taxonomy is still highly debated, ii) collection of fresh specimens may prove difficult. here we address precise taxonomic questions using a small portion of the cytochrome b gene obtained from 45 dry skin/skull museum samples (from 1913 to 1974) originating from two afric ... | 2016 | 27047247 |
| patterns of reproduction in two sympatric gerbil species in arid egypt. | despite a significant number of studies on the reproductive characteristics of small mammals, very little of this work has been conducted on species in egpyt. here, the egyptian greater gerbil (gerbillus pyramidum saint-hilaire, 1825) and anderson's lesser egyptian gerbil (gerbillus andersoni de winton, 1902) in northeastern egypt were surveyed. breeding behavior in these species was synchronized with rainfall in the winter and spring months. surprisingly however, the removal of individual gerbi ... | 2009 | 21392295 |
| density-dependent host selection in ectoparasites: an application of isodar theory to fleas parasitizing rodents. | parasites should make the same decisions that every animal makes regarding fitness reward. they can maximize reproductive success by selection of those habitats that guarantee the greatest fitness output. we consider the host population as a habitat of a parasite population. consequently, hosts (=habitats) that differ quantitatively or qualitatively will support different numbers of parasites. the nature of habitat selection can be detected by isodars, lines along which habitat selection yields ... | 2003 | 12647144 |
| the origin of multiple sex chromosomes in the gerbil gerbillus gerbillus (rodentia: gerbillinae). | the sex chromosomes of the partly sympatric species of gerbils gerbillus pyramidum and g. gerbillus (mammalia: gerbillinae) were investigated by a variety of light- and electron-microscope methods, including dna replication banding and synaptonemal complex (sc) techniques. the sex-chromosome mechanism of g. pyramidum is of the malexy:femalexx type, whereas that of g. gerbillus is of the less common malexy1y2:femalexx system. the results include the demonstration that the x chromosomes of both sp ... | 1983 | 6861521 |
| predator facilitation or interference: a game of vipers and owls. | in predator-prey foraging games, the prey's reaction to one type of predator may either facilitate or hinder the success of another predator. we ask, do different predator species affect each other's patch selection? if the predators facilitate each other, they should prefer to hunt in the same patch; if they interfere, they should prefer to hunt alone. we performed an experiment in a large outdoor vivarium where we presented barn owls (tyto alba) with a choice of hunting greater egyptian gerbil ... | 2014 | 24481981 |
| convergence in morphological patterns and community organization between old and new world rodent guilds. | we studied morphological relationships within three guilds of gerbillid rodents in israel. we found a nonrandom pattern of overdispersed means (community-wide character displacement) for upper incisor widths among the species in these three guilds. upper tooth-row lengths, condylo-basal skull lengths, and tooth-row surfaces displayed similar patterns. we also studied seed-size selection by two well-studied gerbil species, which have previously been found to compete, in order to test whether spec ... | 2001 | 18707303 |
| the pituitary intermediate lobe of the hydrated and dehydrated gerbil. an immunohistochemical and electron-microscopic study. | the pituitary intermediate lobe was studied by immunocytochemistry on semithin sections and by electron microscopy in gerbils (gerbillus pyramidum) caught in summer and winter in the natural biotope or experimentally submitted to chronic hydration or dehydration. in the gerbil, the intermediate lobe was formed by a predominating population of tightly packed melanotrophic cells the immunocytochemical and morphological features of which were comparable to those described in other mammals. a few ty ... | 1999 | 10352347 |
| studies on eimeria species naturally infecting gerbillus pyramidum (1) exogenous stages. | exogenous stages of two new eimerian species, naturally infecting the egyptian gerbil gerbillus pyramidum were described and diagnosed in the present study. (1) the subspherical type of oocysts was 20 x 17 microns (length x width) in average. these are colourless and enveloped within an even double-layered oocyst wall. sporulated oocysts containing four sporocysts each averaged in 10 x 8 microns, and a small spherical oocyst residual body was also observed. this type is termed eimeria pyramidi a ... | 1992 | 1431281 |
| field metabolic rates and water influxes of two sympatric gerbillidae:gerbillus allenbyi andg. pyramidum. | two primarily granivorous rodents of old world deserts,gerbillus allenbyi (mean adult body mass=26 g) andg. pyramidum (mean adult body mass=40 g), coexist in sandy habitats in the northwestern negev desert. both species are burrow dwellers and are nocturnal; however, in their overall distributions,g. pyramidum occurs in more extreme deserts than doesg. allenbyi. in comparing field metabolic rate (fmr) and water influx of the twogerbillus species, we considered two alternative hypotheses: (1) giv ... | 1992 | 28313580 |
| effect of drugs on brain acetylcholine level in gerbillus pyramidum. | 1. the quantitative estimation of total acetylcholine content in the whole brain tissue in normal egyptian gerbil gerbillus pyramidum, gives an average of 1.43 +/- 0.06 micrograms of acetylcholine chloride/g fresh brain tissue. 2. the brain acetylcholine level in gerbillus pyramidum was generally found to vary with the changes induced in the brain activity by drugs. 3. depressants caused a increase and convulsants a decrease in total brain acetylcholine level. 4. phenytoin depressed the brain ac ... | 1983 | 6132759 |
| [red blood cell count of gerbillus pyramidum geoffroy 1825]. | | 1973 | 4742351 |
| [electrophoretic study of the blood protein picture of gerbillus pyramidum geoffroy 1825]. | | 1965 | 4958011 |
| metabolism of gerbillus pyramidum. | | 1961 | 13742330 |
| defense by exploitation in negev gerbils. | in this study, we addressed how frequently a non-traplining animal should visit food patches. more specifically, we investigate if non-traplining animals engage in a behavior called "defense by exploitation", which is characterized by an increase in visitation rates with increased intra-specific competition. we ran four tests with two gerbil species in the negev desert. firstly, we measured patch use of gerbillus pyramidum and gerbillus andersoni allenbyi. we assumed that activity and competitio ... | 2019 | 30716385 |
| intercontinental test of constraint-breaking adaptations: testing behavioural plasticity in the face of a predator with novel hunting strategies. | constraint-breaking adaptations are evolutionary tools that provide a mechanism for incumbent-replacement between species filling similar ecological roles. in common-garden experiments, we exposed populations of two desert rodents to two different viper species, testing their ability to adjust to novel predators that use different hunting strategies. we aimed to understand whether both predators and prey with constraint-breaking adaptations actually manifest comparative advantage over their coun ... | 2020 | 32271948 |
| ninja owl; gerbils over-anticipate an unexpected flying predator. | foragers make decisions based on cues, information collected from their environment, processed into strategic behaviours. this information, processed in multiple regions of the brain, ultimately result in the production of stress hormones and visible changes in behaviour of animals - both reflexively to avoid depredation and strategically to avoid an encounter with the predator. in a common-garden experiment we tested how imperfect information from visual cues of a predator impacts foraging and ... | 2020 | 32505484 |