| histochemical studies on the spinal cord of squirrel monkey (saimiri sciureus). | | 1967 | 4977616 |
| the yellow colour of the lens of man and other primates. | 1. measurements have been made of the absorption spectra of the lenses of human, baboon (papio), rhesus monkey (macaca), squirrel monkey (saimiri sciureus) and bush baby (galago crassicaudatus).2. in all these species an absorption maximum was found between 365 and 368 nm.3. the pigment responsible for this absorption was water-soluble and aqueous extracts were examined. protein-free aqueous extracts showed an additional maximum at 260 nm which could be only partially accounted for by the presen ... | 1969 | 4978734 |
| the ontogeny of social behaviour of squirrel monkeys (saimiri sciureus) in a seminatural environment. | | 1969 | 4979668 |
| plasmodium falciparum induced in the squirrel monkey, saimiri sciureus. | | 1969 | 4980942 |
| a mite infestation in squirrel monkeys (saimiri sciureus). | | 1969 | 4981375 |
| vaginal cytology and reproduction in the squirrel monkey (saimiri sciureus). | | 1970 | 4984820 |
| histochemical distribution of acetylcholinesterase and simple esterases in the brain of squirrel monkey (saimiri sciureus). | | 1970 | 4984999 |
| laparo-uterotomy in squirrel monkey (saimiri sciureus). | | 1970 | 4985877 |
| influence of atherosclerosis on the composition, synthesis, and esterification of lipids in aortas of squirrel monkeys (saimiri sciureus). | | 1969 | 4986077 |
| induction and timing of single and multiple ovulations in the squirrel monkey (saimiri sciureus). | | 1970 | 4987911 |
| whole body sterol metabolism in squirrel monkeys (saimiri sciureus). | | 1970 | 4990011 |
| corticospinal projections from the pre- and postcentral gyri in the squirrel monkey (saimiri sciureus). | | 1970 | 4992435 |
| some quantitative observations on the cochlear division of the eighth nerve in the squirrel monkey (saimiri sciureus). | | 1971 | 4993585 |
| the social organization of a semifree-ranging troop of squirrel monkeys (saimiri sciureus). | | 1971 | 4993824 |
| megestrol acetate: its effect on the inhibition of ovulation in squirrel monkeys, saimiri sciureus. | | 1971 | 4994612 |
| glucose and free fatty acid metabolism in perfused hearts of normal and hypothyroid monkeys (saimiri sciureus). | | 1970 | 4995319 |
| report on a hand-reared squirrel monkey (saimiri sciureus). | | 1970 | 4995338 |
| alkaline phosphatase isoenzymes in the squirrel monkey (saimiri sciureus). | | 1971 | 4997449 |
| ureteral reflux in the squirrel monkey (saimiri sciureus). | | 1971 | 4997450 |
| thermoregulation in the squirrel monkey (saimiri sciureus). | | 1971 | 4997468 |
| pregnenolone and progesterone concentrations in ovarian venous blood of the artificially ovulated squirrel monkey (saimiri sciureus). | | 1971 | 5001456 |
| sporozoite transmission and serial blood passage of plasmodium vivax in squirrel monkeys (saimiri sciureus). | | 1971 | 5003319 |
| further observations on the spiny neurons and synaptic endings in the striatum of the monkey (saimiri sciureus). | | 1971 | 5005511 |
| early behaviors in hand-reared squirrel monkeys (saimiri sciureus). | | 1970 | 5005595 |
| tuberculosis in a squirrel monkey (saimiri sciureus). | | 1968 | 5692931 |
| pulmonary tuberculosis in a squirrel monkey (saimiri sciureus). | | 1968 | 5692932 |
| enzootic toxoplasmosis in caged squirrel monkeys saimiri sciureus. | | 1968 | 5752897 |
| squirrel monkey (saimiri sciureus) leucocyte culture: pokeweed mitogen and human ab serum, important adjuvants. | | 1969 | 5797012 |
| effect of psychic stress on atherosclerosis in the squirrel monkey (saimiri sciureus). | | 1966 | 5988013 |
| non-experimental aural pathology in squirrel monkeys (saimiri sciureus) and marmosets. | | 1966 | 6006444 |
| [lymphocyte heterogeneity of the t system: characterization of an allotypic antiserum recognizing a sub-species antigenic determinant in non-human primates]. | to determine the membrane properties in t-lymphocyte population from saguinus primates or lymphoblastoid cell lines of the same origin, an allotypic antiserum was prepared inoculating two saguinus illigeri with 3.5 x 10(10) viable 70n2 cells obtained in-vitro, from a lymphoma induced by inoculation of herpesvirus saimiri in a saguinus oedipus. the 70n2 cells carried the virus genome in an episomal way; it did not produce infectious virus and it formed spontaneous rosettes (99%) with sheep erythr ... | 1982 | 6086023 |
| [infection of new world primates with junín virus. iv. aotus trivirgatus]. | owl monkeys (aotus trivirgatus) were inoculated with xj, a pathogenic strain of junin virus, seeking new animal models for argentine hemorrhagic fever. nine monkeys were inoculated intramuscularly with 30 or 300,000 tcid50 of junin virus. hematological and virological studies showed no alteration in blood elements such as red cell, reticular cell and platelets, up to 28 days after inoculation. hemoglobin and hematocrit determinations also remained constant. however, significant neutropenia was s ... | 1983 | 6101070 |
| effect of off-vertical tilt and macular ablation on postrotatory nystagmus in the squirrel monkey. | the slow phase eye velocity (spev) and duration of post-rotatory nystagmus (prn) were studied in squirrel monkeys (saimiri sciureus) after a ramp speed rotation (0-200 degrees/sec, with 1 degree/sec2 angular acceleration). when the results were compared between straight upright vertical rotation, 9 degrees tilt rotation, and 18 degrees tilt rotation, faster decay both in spev and in duration was found in the tilt rotation situations. difference in nystagmic decay curves by tilting rotation axis ... | 1980 | 6108673 |
| variations of colour vision in a new world primate can be explained by polymorphism of retinal photopigments. | the squirrel monkey (saimiri sciureus) exhibits a polymorphism of colour vision: some animals are dichromatic, some trichromatic, and within each of these classes there are subtypes that resemble the protan and deutan variants of human colour vision. for each of ten individual monkeys we have obtained (i) behavioural measurements of colour vision and (ii) microspectrophotometric measurements of retinal photopigments. the behavioural tests, carried out in santa barbara, included wavelength discri ... | 1984 | 6149558 |
| genetically determined antigens of squirrel monkey (saimiri sciureus) igg. | alloantigens of squirrel monkey (saimiri sciureus) igg were studied using alloantisera prepared by cross-immunizations among four subspecies. the results demonstrated the occurrence of igg antigenic polymorphism. three distinct fd fragment allotypes were detected. greater alloantigenic complexity occurred among colombian and peruvian squirrel monkeys, which occupy the more central regions of the geographic range; bolivian and guyanan monkeys, which occupy the extremes of the range, expressed les ... | 1982 | 6153016 |
| serum estradiol 17 beta, progesterone, and relative luteinizing hormone levels in saimiri sciureus: cyclic variations and the effect of laparoscopy and follicular aspiration. | with increasing use of the squirrel monkey (saimiri sciureus) in reproductive studies, a precise knowledge of the hormonal variations within the cycle becomes essential for timing of ovulation. the frequent utilization of laparoscopy for follicle aspiration and oocyte recovery warrants analysis of hormonal alterations. in the first study, estradiol 17 beta, progesterone, and luteinizing hormone (lh) levels were quantitated daily in the same group of 14 animals for 16 days. serum estradiol and lh ... | 1982 | 6153019 |
| pulvinar neuron responses to spontaneous and trained eye movements and to light flashes in squirrel monkeys. | single unit responses were recorded in the pulvinar nucleus of the squirrel monkey (saimiri sciureus) while awake and alert, with the head fixed but free to make eye movements. peri-saccadic time histograms revealed only post-saccadic responses to eye movements made spontaneously in the dark or in a uniformly illuminated field (ganzfeld), or to trained eye movements made in response to a spot of light in the periphery. of 120 pulvinar neurons that responded to eye movements in the light, approxi ... | 1980 | 6159157 |
| urinary excretion of catecholamines in the night monkey (aotus trivirgatus) (primates, cebidae). | a seasonal variation in the urinary catecholamines output has been demonstrated in two simians kept under constant ambient conditions : the nocturnal aotus and the diurnal saïmiri sciureus. in aotus, catecholamines output (na + a), in spring, is higher than in other primates including man and even more so in winter. cold exposure increases the na + a excretion in aotus as it does in squirrel monkey and rat but the a output is particularly prominent in saïmiri. fasting does not alter significantl ... | 1981 | 6174092 |
| nonhuman primate in vitro fertilization: seasonality, cumulus cells, cyclic nucleotides, ribonucleic acid, and viability assays. | since establishing our squirrel monkey (saimiri sciureus) in vitro fertilization (ivf) system in 1972, 1788 oocytes have been laparoscopically recovered from follicles with 669 matured and 332 fertilized. oocyte maturation was higher (p less than 0.05) from march to june. among the oocytes, 50% showed first polar body extrusion by 21 hours after recovery. maturation was significantly higher (p less than 0.05) in oocytes with corona radiata cells, compared with denuded oocytes. sperm motility stu ... | 1982 | 6182031 |
| protective antibodies against erythrocytic stages of plasmodium falciparum in experimental infection of the squirrel monkey, saimiri sciureus. | serum and ascitic fluid from squirrel monkeys (saimiri sciureus) inoculated with erythrocytic stages of plasmodium falciparum were collected at different periods of the infection. protection against p. falciparum was achieved by passive transfer of the sera or fluid recovered from animals after spontaneous or drug-induced cure. purified immunoglobulins from the ascitic fluid also conferred protection. in contrast, protective antibodies directed against erythrocytic stages of p. falciparum could ... | 1982 | 6185908 |
| the laminar organization of the lateral geniculate body and the striate cortex in the squirrel monkey (saimiri sciureus). | the organization of the projection from the lateral geniculate body to the striate cortex in the squirrel monkey has been re-examined using the anterograde and retrograde transport of horseradish peroxidase (hrp) and wheat germ agglutinin conjugated to hrp. the results confirm earlier findings that the projections of the magnocellular and parvocellular layers of the lateral geniculate body terminate in separate sublaminae of layer iv of striate cortex; a more superficial projection of the parvoc ... | 1983 | 6187901 |
| distribution of substance p and enkephalin-like immunoreactivity in the substantia nigra of rat, cat and monkey. | a comparative study of the distribution of substance p (sp) and enkephalin (enk) immunoreactivity in the substantia nigra (sn) of the rat, cat and squirrel monkey (saimiri sciureus) was undertaken by means of the indirect immunofluorescence technique. in the rat a dense neuronal network composed of fine fibers displaying sp immunoreactivity is uniformely distributed throughout the rostrocaudal extent of the substantia nigra pars reticulata (snr) and in the ventral part of substantia nigra pars c ... | 1984 | 6208980 |
| an hrp study of hypothalamo-cerebellar and cerebello-hypothalamic connections in squirrel monkey (saimiri sciureus). | this study describes the distribution of labeled hypothalamic neurons in squirrel monkey following pressure injections of horseradish peroxidase (hrp) into cerebellar cortex and the pattern of labeling in the cerebellar nuclei subsequent to iontophoretic injections localized in the hypothalamus. two types of hrp (hrp and a wheat germ agglutinin conjugate, hrp-wga) were used as tracers; tetramethylbenzidine was the chromogen. retrogradely filled neurons were found in lateral (lhar) and posterior ... | 1984 | 6209312 |
| conditional discrimination with conceptual simultaneous and successive cues in the squirrel monkey (saimiri sciureus). | at the end of several stages of training, 4 squirrel monkeys met an 87% criterion for choosing correctly between exemplars of the concept "sameness" and the concept "difference," the simultaneous cues, as a function of having been cued by an exemplar either of the concept "triangularity" (cued sameness) or "heptagonality" (cued difference), the successive cues, which were presented in random order. in addition, the best monkey met criterion when the exemplars of sameness and difference were pres ... | 1984 | 6210175 |
| antiviral cell-mediated immune responses and effect of chromosome polymorphism in herpesvirus saimiri-infected monkeys. | herpesvirus saimiri is a horizontally transmitted virus of squirrel monkeys (saimiri sciureus) which, when inoculated into owl monkeys (aotus trivirgatus), induces fatal malignant lymphoma in 75 to 80% of the animals. previous immunological and virological studies have not indicated why 20 to 25% of inoculated owl monkeys develop a chronic, disease-free h. saimiri infection. in the present study, we examined two parameters to explain why certain owl monkeys are resistant to h. saimiri-induced di ... | 1980 | 6247277 |
| isolation and characterization of a cytomegalovirus from the salivary gland of a squirrel monkey (saimiri sciureus). | | 1980 | 6253743 |
| regional segregation of neurons responding to quickly adapting, slowly adapting, deep and pacinian receptors within thalamic ventroposterior lateral and ventroposterior inferior nuclei in the squirrel monkey (saimiri sciureus). | | 1981 | 6267512 |
| congenital cytomegalovirus effects on postnatal neurological development of squirrel monkey (saimiri sciureus) offspring. | | 1981 | 6273205 |
| chromosomal analyses after in vitro fertilization of squirrel monkey (saimiri sciureus) oocytes. | the effect of 1 microm dibutyril camp (camp media) on the chromosomal normality of in vitro fertilized squirrel monkey oocytes was examined. a total of 877 oocytes were collected laparoscopically 15-16 h after hcg injection from hormonally-induced follicles of 65 squirrel monkeys. of these, 330 (37.6%) were prepared between 6 and 30 h after insemination and analyzed. sperm penetration and the presence of a swollen sperm head in the ooplasm were observed by 6 h, and the nucleate stage by 10 h. ad ... | 1982 | 6282350 |
| coxsackievirus b4 nephritis in the squirrel monkey. | seventeen squirrel monkeys (saimiri sciureus) were experimentally infected with coxsackievirus b4, and the kidneys, as well as other organs, were studied for pathological changes induced by the virus. seven (41%) of these monkeys developed renal lesions--interstitial and glomerular. the coxsackievirus was identified in 4 of these 7 monkeys (by isolation from the renal tissue in 2, by immunofluorescence staining of viral antigen in 1, and by electron microscopic finding of viral particles in 1). ... | 1982 | 6295434 |
| studies on the cerebellocerebral and thalamocortical projections in squirrel monkeys (saimiri sciureus). | laminar field potential analysis of the cerebellocerebral and thalamocortical (t-c) responses was carried out in the cerebral cortex of squirrel monkeys (saimiri sciureus) under pentobarbital anesthesia. anatomical studies using horseradish peroxidase (hrp) were combined with electrophysiological studies. stimulation of the fastigial nucleus induced bilaterally surface positive-depth negative potentials, i.e., deep t-c responses, in the medial part of the motor cortex and in the parietal cortex ... | 1983 | 6295799 |
| background and stimulus-induced patterns of high metabolic activity in the visual cortex (area 17) of the squirrel and macaque monkey. | we have used 2-deoxy-d-[14c]glucose (2-dg) autoradiography and cytochrome oxidase histochemistry to examine background and stimulus-induced patterns of metabolic activity in monkey striate cortex. in squirrel monkeys (saimiri sciureus) that binocularly or monocularly viewed diffuse white light or binocularly viewed bars of many orientations and spatial frequencies, 2-dg consumption was not uniform across the cortex but consisted of regularly spaced radial zones of high uptake. the zones extended ... | 1983 | 6296333 |
| [infection of new world primates with junin virus: iii. saimiri sciureus]. | | 1982 | 6302438 |
| immunoprecipitation as a tool for studying humoral immunity of natural and experimental hosts of herpesvirus saimiri. | herpesvirus saimiri strain 11 and attenuated h. saimiri strain 11 proteins synthesized during the lytic cycle of virus replication were used for immunoprecipitation with various sera from natural (saimiri sciureus) and experimental (saguinus nigricollis, saguinus fuscicollis, aotus trivirgatus, new zealand white rabbits) hosts. the analysis of the precipitates separated in sodium dodecyl sulfate:polyacrylamide gels revealed that in tumor-developing animals a specific set of viral polypeptides we ... | 1983 | 6303583 |
| viral-induced astrocytomas in squirrel monkeys. | saimiri sciureus, the squirrel monkey, is susceptible to the oncogenic effects of jcv following intracerebral inoculation. as in owl monkeys, tumor development follows an incubation time of 14 to 30 months. four of six virus-inoculated monkeys developed cerebral tumors, three of which were astrocytomas grade 4 and the remaining tumor was a poorly differentiated astrocytoma. all tumors showed high cellularity, mitotic figures, and cellular pleomorphism. in the astrocytoma grade 4, neovascularizat ... | 1983 | 6304760 |
| the output organization of the substantia nigra in primate as revealed by a retrograde double labeling method. | the cellular origin and degree of collateralization of the efferent projections of the substantia nigra pars reticulata (snr) in the squirrel monkey (saimiri sciureus) were studied using the following combinations of fluorescent retrograde tracers: evans blue and dapi-primuline, fast blue and nuclear yellow, true blue and nuclear yellow. in a first series of experiments one tracer was injected in the ventral anterior (va) and ventral lateral (vl) thalamic nuclei, and the complementary tracer was ... | 1983 | 6305462 |
| electrophysiologic studies on the pallido- and cerebellothalamic projections in squirrel monkeys (saimiri sciureus). | thalamic projections of the pallidum and the deep cerebellar nuclei were studied by unitary recordings as well as field potential analysis in the thalamus of squirrel monkeys (saimiri sciureus) under sodium pentobarbital anesthesia. stimulation of the pallidum produced a positive field potential preceded by incoming afferent fiber volleys in the thalamus. spontaneous discharges of thalamic neurons were suppressed during this positive potential corresponded to that of the hyperpolarizing potentia ... | 1983 | 6309551 |
| the pallidointralaminar and pallidonigral projections in primate as studied by retrograde double-labeling method. | the cellular origin and degree of collateralization of the pallidointralaminar and pallidonigral projections in squirrel monkey (saimiri sciureus) were studied using evans blue (eb) and a mixture of dapi-primuline (dp) as fluorescent retrograde tracers. in a first series of experiments eb was injected into the va/vl thalamic nuclei whereas dp was delivered into the cm/pf complex. after these injections numerous eb-labeled cells were scattered throughout the central 'motor' zone of the internal s ... | 1983 | 6315152 |
| columnar organization of corticocortical projections in squirrel and rhesus monkeys: similarity of column width in species differing in cortical volume. | to compare the size and pattern of the terminal distribution of corticocortical projections in two primate species with brains of different size, tritiated amino acids were injected into the prefrontal cortex of new world squirrel monkeys (saimiri sciureus) and old world rhesus monkeys (macaca mulatta), and their brains were processed for light microscopic autoradiography. in both species, prefrontal efferents are directed to a number of cortical targets in the same and opposite hemispheres, whe ... | 1983 | 6315786 |
| evidence for thalamic projections from external cuneate nucleus, cell groups z and x, and the mesencephalic nucleus of the trigeminal nerve in squirrel monkey. | horseradish peroxidase (hrp) was injected into the thalamic ventral tier of squirrel monkey and the brainstem was examined for the presence of hrp-reactive cells in the external cuneate nucleus (ecn), nuclei z and x, and the mesencephalic nucleus of the trigeminal nerve (mnv). results indicate that the ecn, z and x have a direct projection to contralateral ventral tier. thalamic projecting cells in the ecn are located predominantly in the medial part of this nucleus. the mnv projects bilaterally ... | 1983 | 6316220 |
| adaptation of the mineralocorticoid target tissues to the high circulating cortisol and progesterone plasma levels in the squirrel monkey. | many new world primate species have elevated circulating free plasma cortisol concentrations, target tissue resistance to cortisol, and no evidence of sodium retention. a representative new world primate, the squirrel monkey (saimiri sciureus), has plasma cortisol concentrations above those necessary to cause complete suppression of the renin-angiotensin-aldosterone axis in an old world primate, the cynomolgus monkey (macaca fascicularis). despite this, the arterial blood pressure as well as the ... | 1984 | 6329650 |
| studies on the indochina i/cdc strain of plasmodium falciparum in colombian and bolivian aotus monkeys and different anophelines. | the indochina i/cdc strain of plasmodium falciparum was isolated from a physician returning to the united states after working in the refugee camps along the thailand-kampuchean border. the strain was established in splenectomized aotus monkeys from colombia after being grown in vitro for 50 days. during the first three passages in colombian monkeys, the parasites were not infective to bolivian aotus monkeys. after six intervening passages in saimiri sciureus monkeys, the parasites produced high ... | 1983 | 6338191 |
| [use of purified antigens in the serodiagnosis and epidemiologic studies of human malaria. importance of the elisa technic for determining specific igg and igm]. | a purified antigen was isolated from the red blood cells of saimiri sciureus which was experimentally infected by plasmodium falciparum. an enzyme immunoassay (elisa) was carried out thanks to this antigen. the results obtained with the test were evaluated from two series of sera: one coming from an endemic area, the other taken out of it. the results were compared with those obtained with indirect fluorescent antibody test (ifat) which is considerated as reference test. there is a good correlat ... | 1983 | 6340845 |
| saimiri sciureus (karyotype 14-7): an alternative experimental model of plasmodium falciparum infection. | in an earlier manuscript, we described the first phase of adaptation of the palo alto i strain of plasmodium falciparum to saimiri sciureus (squirrel monkeys). now, after more than 50 p. falciparum blood transfers in splenectomized saimiri, the parasite has become fully adapted to this experimental host. a highly reproducible pattern of infection is evident in these splenectomized animals, which is characterized by a rapidly rising parasitemia and a lethal outcome. in intact animals, the course ... | 1983 | 6344671 |
| studies of the sal i strain of plasmodium vivax in the squirrel monkey (saimiri sciureus). | the sal i strain of plasmodium vivax was successfully adapted to three phenotypes of the squirrel monkey, saimiri sciureus. through five linear blood passages, parasitemias in excess of 200,000/mm3 blood were attained; bolivian phenotype saimiri appear to develop higher peak parasitemias. sporozoites of the sal i strain inoculated intravenously produced patent parasitemias in all five squirrel monkeys challenged, with prepatent periods ranging from 21 to 38 days. anopheles freeborni and an. gamb ... | 1983 | 6355425 |
| ethological analysis of amphetamine action on social behavior in squirrel monkeys (saimiri sciureus). | | 1983 | 6359170 |
| protective immunization of the squirrel monkey against asexual blood stages of plasmodium falciparum by use of parasite protein fractions. | we had previously shown that two polypeptides of plasmodium falciparum are preferentially recognized by antibodies of resistant squirrel monkeys saimiri sciureus. free parasites were isolated from synchronized cultures on human erythrocytes initially inoculated with infected saimiri erythrocytes. crude extracts were prepared from mature schizont stages and electrophoresed on preparative nadodso4/polyacrylamide gels. two groups of five monkeys were immunized with protein fractions eluted from the ... | 1984 | 6364136 |
| immunization against plasmodium falciparum asexual blood stages using soluble antigens. | saimiri sciureus monkeys have been successfully immunized against a human malaria parasite, plasmodium falciparum, using soluble antigens purified from schizont and merozoite extracts. high levels of antibodies reacting with schizont and merozoite specific polypeptides of 140 and 200 kdaltons were detected in the sera of protected monkeys. the five immunized monkeys survived a challenge infection with 5 x 10(7) parasites inducing a fulminant disease in control monkeys. | 1984 | 6370520 |
| immunohistochemical localization of corticotropin releasing factor (crf) in the hypothalamus of the squirrel monkey, saimiri sciureus. | corticotropin releasing factor immunoreactive (crf-ir) neuronal cell bodies and fibers have been localized in both the paraventricular and supraoptic nuclei of the hypothalamus of the squirrel monkey. the major projection from these nuclei is to the median eminence and neural stem. a few crf-ir fibers were found in the dorsal pars nervosa primarily adjacent to the pars intermedia. a rostral projection of crf-ir fibers is associated with the suprachiasmatic nucleus and continues to septal areas. ... | 1984 | 6384953 |
| scapula of apidium phiomense: a small anthropoid from the oligocene of egypt. | a scapular fragment from the upper fossil wood zone, quarry i, fayum depression, egypt, is assigned to the taxon apidium phiomense. this animal may have approximated the size of galago crassicaudatus or nycticebus coucang, as predicted by regressing body weight on glenoid surface area and fossa length for an assortment of living primates. morphometric values for spinoglenoid, axilloglenoid, and axillospinal angles indicate locomotor affinities of a. phiomense with colobine monkeys. other nonmetr ... | 1983 | 6407926 |
| infection of female squirrel monkeys (saimiri sciureus) with trichomonas vaginalis as a model of trichomoniasis in women. | marmosets, tamarins, owl monkeys, and squirrel monkeys were inoculated intravaginally with trichomonas vaginalis. the latter animal species was most susceptible, trichomonads being recovered from four of six monkeys for periods ranging usually up to one month. vaginal discharge was seen in most infected animals but polymorphonuclear leucocytes were rare. infected animals developed serum igg antibody responses and also local igg and iga responses, the latter occurring sometimes on reinoculation i ... | 1983 | 6409346 |
| serological analysis of ureaplasmas isolated from various animals. | ureaplasmas from various animal species were serologically characterized by the growth inhibition test as well as by the metabolism inhibition test. the animals positive for ureaplasmas included 9 common squirrel monkeys, 9 green monkeys, 164 cynomolgus monkeys, 58 chimpanzees, 73 goats, 11 sheep, 102 dogs, 116 cats, 64 cattle, 290 chickens, 3 red jungle fowls and 5 japanese bantams. simian ureaplasmas were divided into four serogroups in accordance with the zoological classification of the prim ... | 1984 | 6439681 |
| indoleamine-accumulating horizontal cells in the squirrel monkey retina. | horizontal cells capable of selectively accumulating indoleamines have been found in the retina of saimiri sciureus, the new world squirrel monkey. the uptake of 3h-serotonin (5ht) in vivo and in vitro has been localized by light and electron microscopic (em) autoradiography only to horizontal cells. in the central retina up to 50% and in the periphery 15-20% of the somas lying at the scleral border of the inner nuclear layer are labeled. in em autoradiographs, labeled processes occur as lateral ... | 1984 | 6469494 |
| types of synapses and degeneration in the thalamic nucleus ventralis oralis posterior after cerebellar lesions in the squirrel monkey. | the thalamic nucleus ventralis oralis posterior (v.o.p) of saimiri sciureus corresponds to the posterior basal part of the ventral lateral nucleus and is characterized by medium-sized nerve cells. electron microscopic study revealed seven different types of synapses and the size of vesicles in each has been quantitatively determined. the synapse of type i lr (large with rounded vesicles) is considerably larger than the similar type iv mr (medium-sized with rounded vesicles) both contain round to ... | 1984 | 6481156 |
| biological and thrombolytic properties of proenzyme and active forms of human urokinase--ii. turnover of natural and recombinant urokinase in rabbits and squirrel monkeys. | the turnover of recombinant pro-urokinase (rec-pro-uk), recombinant urokinase (rec-uk) and natural urinary urokinase (nat-uk) was studied in rabbits and in squirrel monkeys (saimiri sciureus). following intravenous injection, urokinase activity disappeared rapidly from the blood. the initial disappearance rate could be described by a single exponential term with a t 1/2 of 3 to 6 min for each molecular form of urokinase in both species. urokinase related antigen, measured with a radioimmunoassay ... | 1984 | 6495260 |
| individual variations in color vision among squirrel monkeys (saimiri sciureus) of different geographical origins. | a forced-choice discrimination procedure was used to test color vision and visual sensitivity in 10 squirrel monkeys (saimiri sciureus) originating from three geographical locations (bolivia, colombia, guyana). in agreement with results from an earlier study of vision in squirrel monkeys of peruvian origin, striking individual variations in color vision were found among these squirrel monkeys. some of these animals had trichromatic color vision, while others were dichromats. within these two cat ... | 1984 | 6509903 |
| diarrhea in nonhuman primates: a survey of primate colonies for incidence rates and clinical opinion. | veterinary clinicians associated with 18 colonies of nonhuman primates were surveyed for their experience with diarrhea disease in colony animals for calendar year 1981. the 1981 diarrhea incidence rate, diarrhea-specific mortality rate and diarrhea case fatality rate for 13,385 monkeys were 10.6%, 1.2% and 11.1%, respectively. it was not possible to incriminate age or type of housing as risk factors for diarrhea, but some species seemed at greater risk than others. erythrocebus patas monkeys ha ... | 1984 | 6513506 |
| electroretinogram measurements of cone spectral sensitivity in dichromatic monkeys. | the corneal electroretinogram (erg) was used to investigate the spectral sensitivities of cones in 12 dichromatic squirrel monkeys (saimiri sciureus) whose color-vision capacities were established in behavioral tests. three different varieties of dichromacy were represented among these animals. a flicker-photometric procedure was used in which the erg response to a rapidly flickering monochromatic test light was compared with the response elicited by a similarly flickering reference light. the s ... | 1984 | 6520635 |
| brain irradiation: effects on regional mao and comt activity in the brain of the squirrel monkey and on the incorporation of [14c]tyrosine into catecholamines. | the effects of brain irradiation on the enzyme activity of monoamine oxidase (mao) and catecholamine o-methyltransferase (comt), as well as on the rate of incorporation of [14c]tyrosine into catecholamines (cas), were examined in brain regions of the squirrel monkey (saimiri sciureus). results indicated that proton irradiation of the striate visual cortex at either 10,000 or 20,000 rad drastically affected the mao activity, moderately affected the comt activity, and significantly altered the inc ... | 1984 | 6520885 |
| within-species variations in visual capacity among squirrel monkeys (saimiri sciureus): color vision. | color vision was studied in 27 squirrel monkeys (saimiri sciureus) of peruvian origin (roman arch variety). tests of wavelength discrimination and rayleigh matching as well as a search for a spectral neutral point were carried out in a behavioral paradigm involving a three-alternative, forced-choice discrimination. significant individual variations in color vision were found in this species. some squirrel monkeys have trichromatic color vision, others are dichromats. within each of these catagor ... | 1984 | 6523747 |
| dimensional analysis and dynamic response characterization of mammalian peripheral vestibular structures. | extensive morphometric measurements were made on the vestibular system of the rabbit ( oryctulagus cuniculus), the gerbil (meriones unguiculatus), the chinchilla (chinchilla laniger ), and the squirrel monkey (saimiri sciureus) from serial sections of temporal bones. additionally, a more limited set of measurements were also completed on the owl monkey (aotus trivirgatus), the capuchin monkey (cebus sp.), the harp seal ( pagophilus groenlandicus erxleben , 1777), and the two-toed sloth ( choloep ... | 1984 | 6609629 |
| pharmacokinetic and pharmacodynamic factors contributing to the convulsant action of beta-carboline-3-carboxylic acid esters. | both the methyl ester of beta-carboline-3-carboxylic acid and the 6,7-dimethoxy-4-ethyl derivative of this compound are potent convulsants in rodents, while the ethyl ester of beta-carboline-3-carboxylic acid does not cause convulsions, even when administered at very high doses. the rate of degradation of these compounds by rat plasma (in vitro) parallels their potencies as convulsants. in contrast, 3-carboethoxy-beta-carboline was found to potently elicit tonic and clonic convulsions in the squ ... | 1983 | 6621253 |
| the effects of light reinforcement and noise on young and old squirrel monkeys (saimiri sciureus). | in two age groups of squirrel monkeys, subjects performed an operant response for light onset in the presence or absence of white noise. results of the study indicate that light is an effective reinforcer for both younger and older monkeys, but differentially. the study also indicates that the presence of white noise affects responding in both age groups dissimilarly. | 1983 | 6628496 |
| auditory entrainment of primate drinking rhythms following partial suprachiasmatic nuclei lesions. | in the absence of other environmental cycles, daily variations in auditory stimuli are normally not capable of entraining the circadian rhythms of drinking behavior in the squirrel monkey (saimiri sciureus). however, the drinking rhythm appears to become entrainable by previously ineffective auditory cues after lesions are placed which destroy only the caudal portion of the hypothalamic suprachiasmatic nuclei. the results suggest specificity of function within the scn and an increased influence ... | 1983 | 6657774 |
| light-dark masking of circadian temperature and activity rhythms in squirrel monkeys. | in addition to the synchronizing effects of light-dark cycles on the circadian timing system, light per se can have a direct masking effect on the rhythmic variables monitored as indicators of the circadian system. to evaluate the masking action of light on the rest-activity and body temperature rhythms of squirrel monkeys (saimiri sciureus), animals were exposed to cycles of 2 h of light alternating with 2 h of darkness (ld 2:2). there was evidence of phase-dependent masking responses in both r ... | 1983 | 6660335 |
| aneurysms in a large colony of squirrel monkeys (saimiri sciureus). | this communication reports the findings of a retrospective study of extracranial aneurysms found at necropsy in a large colony of squirrel monkeys (saimiri sciureus). eleven (1.5%) of 730 cases had dissecting, saccular, or fusiform aneurysms of the carotid arteries or aorta. saccular and fusiform aneurysms were found only in animals that had been fed atherogenic diets, whereas dissecting aneurysms occurred in both normo- and hypercholesterolemic monkeys. neither the type or location of aneurysms ... | 1983 | 6664071 |
| hysterosalpingography: a technique to aid in assessment of reproductive fitness of female squirrel monkeys (saimiri sciureus). | a hysterosalpingography method was developed to examine the uterine cavity and oviducts of potential additions to our squirrel monkey breeding colony and those animals within the colony with a history of infertility. females to be examined were anesthetized and placed in dorsal recumbency. a needle was inserted transabdominally into the body of the uterus, the cervix was sealed with a clamp applied vaginally, and water soluble contrast media was infused into the uterine cavity with sufficient pr ... | 1983 | 6664072 |
| the subcortical afferents to caudate nucleus and putamen in primate: a fluorescence retrograde double labeling study. | the cellular origin and degree of collateralization of the subcortical afferents to the caudate nucleus and the putamen in squirrel monkeys (saimiri sciureus) were studied using the following combinations of fluorescent retrograde tracers: evans blue and dapi-primuline, fast blue and nuclear yellow, true blue and nuclear yellow. after the injections, cells containing the tracer delivered in caudate nucleus (caudate-labeled cells) and others labeled with the complementary tracer injected in putam ... | 1983 | 6664490 |
| preliminary quantitative studies of prehension in squirrel monkeys (saimiri sciureus). | squirrel monkeys were filmed in the act of prehending objects of various sizes, shapes, and states of motion. subsequent three-dimensional analyses indicated that general aspects of prehension do not vary grossly across individuals nor as a function of the object to be prehended, at least at the level of measurement used in these studies. the monkeys exhibited only whole-hand control, even with small or moving objects. however, in comparison with stationary objects, moving objects did elicit var ... | 1983 | 6667371 |
| effects of reproductive state on vocalizations in squirrel monkeys (saimiri sciureus). | vocalizations and behavior of a group of 6 squirrel monkeys, 2 males and 4 females, were recorded during the nonbreeding and breeding seasons. behavioral and physical criteria were used to determine the presence of estrus. during the breeding season the types of vocalizations uttered by estrous females changed, and the adult male increased his rate of vocalizing. err vocalizations by estrous females were associated with increased following and initiation of affiliative behavior with the adult ma ... | 1983 | 6685097 |
| types of synapses in the pallidum and their differential degeneration following lesions of pallidal afferents in squirrel monkey (saimiri sciureus). | | 1984 | 6695596 |
| identification of eight types of synapses in the pallidum externum and internum in squirrel monkey (saimiri sciureus). | the electron microscopic study of the neuronal structures of the pallidum externum (pa.e) and internum (pa.i) in squirrel monkey (saimiri sciureus) has revealed in both segments a frequent large type of nerve cell and a rare small one, probably an interneuron. with respect to the small cells, only one axosomatic synapse inserts on the slender rim of cytoplasm; the clear nucleus is always invaginated and contains a small nucleolus. eight types of synapses can be differentiated in pa.e and pa.i. t ... | 1984 | 6702413 |
| a nonhuman primate model of gilbert's syndrome. | a bolivian population of squirrel monkeys, saimiri sciureus, exhibits several features of gilbert's syndrome in man, and is proposed as a nonhuman primate model of the condition. the bolivian population was found to have higher fasting (40.6 +/- 2.7 microm; mean +/- s.e.) and postcibal (9.9 +/- 0.9 microm) plasma unconjugated bilirubin concentrations (p less than 0.001) than a closely related brazilian population (fasting 5.5 +/- 0.7 microm); postcibal (2.4 +/- 0.7 microm). after intravenous adm ... | 1984 | 6706295 |
| minimal changes in hypothalamic temperature accompany microwave-induced alteration of thermoregulatory behavior. | this study probed the mechanisms underlying microwave-induced alterations of thermoregulatory behavior. adult male squirrel monkeys (saimiri sciureus), trained to regulate the temperature of their immediate environment (ta) behaviorally, were chronically implanted with teflon reentrant tubes in the medical preoptic/anterior hypothalamic area (po/ah), the brainstem region considered to control normal thermoregulatory processes. a vitek temperature probe inserted into the tube measured po/ah tempe ... | 1984 | 6712747 |
| distribution of acetylcholinesterase-containing neurons in the basal forebrain and upper brainstem of the squirrel monkey (saimiri sciureus). | the topographical distribution of neurons containing acetylcholinesterase (ache, ec 3.1.1.7) in the basal forebrain and upper brainstem of the squirrel monkey (saimiri sciureus) was studied by means of butcher's pharmacohistochemical technique which involves staining for ache at various times after the systemic administration of the ache inhibitor di-isopropylphosphorofluoridate (dfp). only those neurons whose ache staining was as intense as that of known cholinergic neurons present in the same ... | 1984 | 6713215 |
| hemobartonellosis in squirrel monkeys (saimiri sciureus) in a domestic breeding colony: case report and preliminary study. | infection with hemobartonella sp was diagnosed in a colony-born squirrel monkey with normocytic, normochromic anemia and pronounced punctate erythrocytic basophilic stippling on wright's-giemsa stained blood films. the diagnosis was confirmed using transmission electron microscopy. two randomly selected colony-born squirrel monkeys were splenectomized in an effort to activate and detect possible latent hemobartonellosis . one monkey became parasitemic 12 days following splenectomy. the second mo ... | 1984 | 6716965 |
| dendritic growth following labyrinthectomy in the squirrel monkey. light and electron microscopic studies. | in the squirrel monkey (saimiri sciureus) peripheral vestibular dendrites underwent degeneration after destruction of the vestibular end organs (labyrinthectomy). the dendrites subsequently grew into the remodelled area where the end organs, surrounding tissues and inner ear fluid spaces were previously located, and were progressively occupied by connective tissue, blood vessels and also new bone. this finding indicates that peripheral vestibular dendrites of adult squirrel monkey can grow, that ... | 1984 | 6720297 |
| the effects of nutrition on unconjugated plasma bilirubin concentrations in squirrel monkeys. | bolivian squirrel monkeys (saimiri sciureus) have fasting unconjugated hyperbilirubinemia (males: 2.0 +/- 0.14; females: 3.0 +/- 0.26 mg per dl) which resembles that of humans with gilbert's syndrome. closely related brazilian squirrel monkeys have fasting levels (males: 0.29 +/- 0.045; females: 0.36 +/- 0.073 mg per dl) similar to normal people. the purpose of this study was to identify the underlying mechanisms and the nutritional factors involved. both bolivian and brazilian squirrel monkeys ... | 1984 | 6724513 |
| role of the suprachiasmatic nuclei in the circadian timing system of the squirrel monkey. i. the generation of rhythmicity. | the circadian organization of squirrel monkey (saimiri sciureus) drinking behavior was evaluated before and after the placement of radiofrequency lesions which completely destroyed the suprachiasmatic nuclei (scn) in 4 monkeys and partially ablated the scn in another 4 animals. in continuous illumination (ll: 600 lux) prior to surgery, each monkey had a precise free-running circadian rhythm of drinking behavior with a period of 25.31 +/- 0.21 h (means +/- s.e.m.). by 4-6 weeks following the lesi ... | 1984 | 6733473 |
| role of the suprachiasmatic nuclei in the circadian timing system of the squirrel monkey. ii. light-dark cycle entrainment. | the role of the suprachiasmatic nuclei (scn) in light-dark (ld) cycle entrainment in the squirrel monkey (saimiri sciureus) was evaluated by continuously monitoring core body temperature and drinking behavior in both intact and scn-lesioned animals exposed to different ld conditions. in a 24-h ld cycle with 12 h of light per day (ld 12:12), both intact and scn-lesioned monkeys had a prominent rhythm in body temperature with an acrophase 6.51 +/- 0.36 h (intact) or 5.12 +/- 0.42 h (scn-lesioned) ... | 1984 | 6733474 |