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instrumental electrodermal conditioning in the monkey (cebus albifrons): acquisition and long-term retention. 1979120257
infection of capuchin monkeys (cebus albifrons) with herpesvirus saimiri.herpesvirus saimiri (hvs) induced persistent, clinically inapparent infections of long-term duration in capuchin monkeys (cebus albifrons). the infections were characterized by development of antibody to hvs-associated antigens and recovery of low levels of virus-genome-carrying lymphocytes in the peripheral blood. peripheral lymphocyte counts remained in low-normal to normal ranges and no physical signs of lymphoma were evident. prednisolone treatment caused immunosuppression in one monkey; thi ...1975164564
the effects of a 20-week nutritional insult on the skeletal development of cebus albifrons during the 1st year of life.using an atlas constructed from records of a group of normal monkeys in the same colony, the effects of a 20-week low-calorie or low-protein nutritional insult on skeletal development were determined. the most significantly retarded sites were the late-forming ossifications (epiphyses, sesamoids, and tuberosites). a general increase in ossification anomalies and in individual variation was evident. the similarity of these findings to studies previously reported for man indicates the utility of n ...1976179314
long-term effect of low dietary calcium:phosphate ratio on the skeleton of cebus albifrons monkeys.wildcaught cinnamon ringtail monkeys, cebus albifrons, were fed diets with ca:p ratios of 1:4 1:2.1 1:0,4, and 1:0.5 for 3 to 88 months. monkeys fed the diet with ca:p ratios of 1:4 and 1:21 c ratios similar to that of human diets) had minor microscopic changes suggestive of osteoporosis when compared to other species of animals. the changes were not detected by conventional or magnification radiography or by 125i photon absorptiometry. these findings are in in striking contrast to studies in ot ...1977404407
radioimmunoassay of a human serum growth factor for balb/c-3t3 cells: derivation from platelets.a radioimmunoassay has been developed for the detection and quantification of a human serum polypeptide that has growth-promoting activity for confluent balb/c-3t3 cells. antiserum to this growth factor does not recognize antigens in mouse, guinea pig, or bovine serum but does detect some crossreacting antigen in the serum of the new world monkey cebus albifrons and more in the serum of the old world rhesus monkeys macaca mulatta and m. fascicularis, demonstrating that the antigenic determinants ...1977405669
movement disorders induced in monkeys by chronic haloperidol treatment.after several months of treatment, cebus apella, cebus albifrons, and saimiri sciurea monkeys maintained on haloperidol, in doses of 0.5 or 1.0 mg/kg orally 5 days per week, began to display severe movement disorders, typically 1-6 h post-drug. cebus monkeys exhibited violent, uncontrolled movements that flung the animals about the cage. such episodes usually lasted only a few minutes, recurring several times during the period following drug ingestion. writhing and bizarre postures dominated the ...1977408858
dyskinesias evoked in monkeys by weekly administration of haloperidol.in two cebus (cebus albifrons) monkeys given weekly oral doses of 0.25 milligram of haloperidol per kilogram, movement disorders appeared 1 to 8 hours after drug administration following the tenth weekly dose. these disorders included oral movements, peculiar postures, writhing, and stretching. such reactions faded in intensity after the next two doses. increasing the dose to 0.5 milligram per kilogram has elicited the disorders reliably after each weekly dose for almost 2 years. similar reactio ...1978417399
protein deficiency and energy restriction in young cebus monkeys.infant cebus monkeys (cebus albifrons) were fed liquid formulas that were limited in protein, energy, or a combination of the two restrictions. weight gain, food intake, hematological development, and plasma protein and cholesterol levels were monitored over a 20-week period. the animals restricted in protein developed the classical signs of protein deficiency--reductions in plasma albumin, a mild anemia, accumulation of fat in the liver, and, in a few cases, facial edema. these animals maintain ...1978418417
physical growth of cebus monkeys, cebus albifrons, during protein or calorie deficiency.infant cebus monkey (cebus albifrons) on experimental diets providing low-protein (2.8% of calories) or low-calorie (67% of ad libitum intake) levels for 20 weeks beginning at 8 weeks of age showed marked changes in their patterns of physical growth. significant size differences between the malnourished animals and the control group appeared within 4 weeks. although rates of growth were significantly reduced in all measurements, all of the malnourished monkeys, including low-protein animals show ...1975804246
physical growth of cebus monkeys (cebus albifrons) during the first year of life.infannt cebus monkeys, removed from their mothers shortly after birth, were reared in a primate nursery on diets of controlled nutritional quality. at regular intervals between birth and one year of age, each monkey was anesthetized, measured, and radiographed. measurements were fitted to functions of the animal's age in days; a linear function for the first 6 to 8 weeks and a logarithmic function for the remainder of the first year. mean constant curves have been calculated for each measure and ...1975805761
ultrastructure of quiescent oocytes of cebus albifrons.quiescent oocytes of the monkey cebus albifrons were examined with the electron microscope. in many respects the ultrastructure of these cells was similar to that of other mammalian species. elongate and oval mitochondria, lamellar golgi complexes, small profiles of smooth endoplasmic reticulum, and vacuolar organelles were randomly distributed around a round nucleus which usually contained a nucleolus and clumps of heterochromatin. among the unusual morphological characteristics of these oocyte ...1975811634
inhibition of urate excretion by pyrazinoate: a micropuncture study.anesthetized monkeys (cebus albifrons) undergoing moderate mannitol diuresis were treated with infusions containing lithium urate to elevate the urate concentration in plasma to 45-68 mug/ml and containing the uricosuric drug, 2-nitroprobenecid, to enhance the renal clearance or urate. the urate/inulin clearance ratio was 0.55 +/- 0.03. when pyrazinoate was added to the infusion the clearance ratio fell to 0.26 +/- 0.02. analysis of free-flow micropuncture samples revealed a major effect of pyra ...1975813533
papillary carcinoma of apocrine sweat glands in a capuchin monkey (cebus albifrons).a tumor removed from the skin of the right pectoral region of a 19-year-old male capuchin monkey (cebus albifrons) was morphologically classified as a papillary carcinoma of apocrine sweat gland origin. the designation of malignancy was based primarily on cellular pleomorphism and stromal invasion. this is believed to be the first report of this neoplasm in nonhuman primates. there has been no evidence of recurrence nor metastasis in the 12 months following excision.1976818388
isolation and characterization of two new herpes-like viruses from capuchin monkeys.two herpes-like viruses were isolated from capuchin monkey (cebus apella) brain and (cebus albifrons) spleen cell cultures, respectively. both isolates induced similar cytopathic effects consisting of rounded and ballooned cells in the original monkey cell cultures and in a wide range of permissive cell types. neutralizing antibody to each virus was present in serum from the capuchin monkey from which it was isolated, but the two viruses did not cross-react by neutralization. fluorescein isothio ...1976823119
the transport of vitamin d in the serum of primates."transcalciferin" (the serum transport protein for cholecalciferol and related substances) of two new world monkeys, cebus apella and cebus albifrons, was found to be immunologically identical with the transcalciferin of other monkeys and partially with that of man. in contrast with the alpha-globulin mobility of the transcalciferin of other primates, the transcalciferin of cebus monkey has the electrophoretic mobility of albumin. most of the serum 25-hydroxycholecalciferol was precipitable with ...1976827286
folate deficiency and an abnormal lymphocyte deoxyuridine suppression test in monkeys.cebus albifrons were fed folate-deficient diets in order to assess folate status at the cellular level with the deoxyuridine suppression test. plasma and red blood cell folates were significantly lower at 2 months, compared to control values. hematologic signs of megaloblastic anemia occurred after 6 months, with significantly lower hematocrit, hemoglobin and red blood cell number values and increased polymorphonuclear leukocyte lobe counts. urinary formiminoglutamic acid excretion also was elev ...19911806535
a comparative study of neonatal skeletal development in cebus and other primates.comparisons of hand/wrist radiographs of neonatal cebus albifrons (n = 14) and cebus apella (n = 4) with those of saimiri sciureus boliviensis (n = 9) and macaca mulatta (n = 63) reveal that the cebid monkeys show much less skeletal ossification at birth than macaques. differences in gestation time alone cannot account for the differences in skeletal maturity at birth in the two groups of monkeys. the skeletal precocity of the newborn macaques indicates that their ossification either begins earl ...19902391051
lack of platelet monoamine oxidase activity in cebus monkeys (cebus albifrons).1. recent evidence suggests that monoamine oxidase (mao) plays an important role modulating the extrapyramidal syndromes produced by neuroleptic drugs in both human and nonhuman primates. 2. to evaluate the possibility of using peripheral blood platelet mao-b levels as indices of central nervous system mao-b effects, we measured platelet mao-b levels in cebus monkeys that were previously tested with neuroleptics (n = 36) or drug naive (n = 6). 3. no platelet mao-b was consistently detectable in ...19892572397
assessment of the efficiency of nitrogen utilization in the infant cebus monkey (cebus albifrons) by nitrogen balance.nitrogen (n) balance and growth were utilized to assess the efficiency of n utilization in the infant cebus monkey (cebus albifrons). the efficiency of n utilization as calculated from n balance data was 35%. the efficiency of n utilization for growth was 37% as determined by weight change over a 28-day trial and by body composition data from the literature. these results indicate, therefore, that growth and n balance are comparable indicators of n utilization in these primates.19863735400
dietary fat unsaturation enhances drug metabolism in cebus but not in squirrel monkeys.antipyrine disappearance and sleeping time following barbiturate anesthesia were assessed to evaluate the effects of dietary corn oil and coconut oil on the drug-metabolizing enzyme systems (dmes) in cebus (cebus albifrons) and squirrel (saimiri sciureus) monkeys. plasma antipyrine clearance (half-life) was measured in both species before and after induction of dmes by i.v. injection of barbiturates on two consecutive days. sleeping time was measured after administration of either pentobarbital ...19853998859
the effects of long-term soy protein and milk protein feeding on the pancreas of cebus albifrons monkeys.twenty-seven 2- to 4-yr-old cebus monkeys (cebus albifrons) were fed from infancy purified diets containing lactalbumin, soy isolate, casein or soy concentrate as the sole protein source. hematologic and clinical chemistry values were similar for all groups. head and tail portions of each pancreas were surgically removed for histopathologic evaluation and determination of protein, rna and dna content, and for trypsin and chymotrypsin activity. hematoxylin and eosin-stained sections from 26 of 27 ...19854067660
behavioral assessment of pain detection and tolerance in monkeys.cebus albifrons monkeys received electrical stimulation of the hindlimbs over a wide range of intensities. on trials signalled by a blue light, the animals were permitted to escape shock by pressing a disc, or shock was terminated after 8 sec (free escape). escape force (disc pressure) was found to increase as stimulation intensity increased well beyond escape threshold, while shock duration curves reached plateau at the mid-range of intensities. the shock duration curves generated by free escap ...19734196268
ectopic splenic nodules in the pancreas of a capuchin monkey (cebus albifrons). 19734201082
hematological development of the cebus monkey (cebus albifrons and apella). 19744215711
multiple helminth infections in cinnamon-ringtail monkeys (cebus albifrons). 19674228081
occurrence of athesmia sp. in the cinnamon ringtail monkey, cebus albifrons. 19684233857
lethal reticuloproliferative disease induced in cebus albifrons monkeys by herpesvirus saimiri. 19704321016
the influence of oral contraceptive steroids on serum lipids.the effects of oral contraceptives on serum lipids were investigated in humans and monkeys at the temple university health sciences center. the compositions of the pills were: 1) 2.0 mg chlormadinone acetate, .08 mg mestranol; 2) 10.0 mg medroxyprogesterone acetate, .05 mg ethinyl estradiol; 3) 1.0 mg ethynodiol diacetate, .1 mg mestranol; 4) 1.0 mg norethindrone acetate, .05 mg ethinyl estradiol, and 5) .5 mg norgestrel, .05 mg ethinyl estradiol. 238 immediately puerperal black women, health ...19734351501
vitamins d2 and d3 in new world primates: influence on calcium absorption.in cebus albifrons monkeys it was demonstrated that vitamin d(3) promotes the intestinal absorption of calcium-47 and that vitamin d(2) does not increase absorption above that seen in monkeys deficient in vitamin d. these data support previous observations that vitamin d(2) is not effective in preventing metabolic bone disease in this species.19674378051
protein requirements of young cebus monkeys (cebus albifrons and apella). 19734630172
functional interpretation of the flash-evoked response in the chiasma of the monkey (cebus albifrons). 19734632233
atherosclerosis in cebus albifrons monkeys. i. sterol metabolism. 19684968977
synchronized retinal afterdischarge and neural dark adaptation in the monkey (cebus albifrons). 19684968978
nerve conduction in cats and cebus albifrons monkeys. 19684972562
atherosclerosis in cebus albifrons monkeys. [. clinical and pathologic studies. 19694975562
an ameloblastic odontoma in a cebus monkey (cebus albifrons). 19694981376
myocarditis associated with trypanosomiasis in a cebus monkey (cebus albifrons). 19676070319
cholangiocarcinoma in a capuchin monkey (cebus albifrons). 19806250275
a primate model for age and host response to genital herpetic infection: determinants of latency.thirty five female cebus albifrons monkeys (16 adolescents and 19 adults) were infected vaginally with herpes simplex virus (hsv) type 2. fifteen developed spontaneous recurrent genital hsv infections. all 35 were killed for study eight to 12 months after primary infection, and tissue from the vagina, cervix, uterus, ovary, paracervical autonomic plexus, and lumbosacral dorsal root ganglia of eight animals. host age was the most important variable influencing viral latency; 69% of adolescents an ...19816263982
z-dna immunoreactivity in fixed metaphase chromosomes of primates.antibodies against z-dna bind to fixed metaphase chromosomes of man and cebus albifrons (platyrrhini, primate). by indirect immunofluorescence and indirect immunoperoxidase techniques, a heavy staining is detected in some segments of chromosomes of c. albifrons. these segments correspond to r-band-positive heterochromatin, which has a high g + c-base content. euchromatin of human and cebus chromosomes show a weak and heterogeneous staining that consistently reproduces an r- and t-banding pattern ...19836351068
protein requirements of adult cebus monkeys (cebus albifrons).twenty-nine adult cebus monkeys (18 males and 11 females) were used in long-term feeding experiments designed to study the protein requirements of this species. by feeding an otherwise adequate diet containing graded levels of lactalbumin, it was shown that diets containing 7.5% of the calories as protein were necessary for long-term weight maintenance. this estimate is compared to data obtained with young growing cebus monkeys in which 7% of the calories was sufficient for maximum growth, altho ...19806776797
representations of the body surface in areas 3b and 1 of postcentral parietal cortex of cebus monkeys.the somatotopic organization of postcentral parietal cortex was determined with microelectrode mapping methods in a new world monkey, cebus albifrons. as in previous studies in macaque, squirrel and owl monkeys, two separate representations of the body surface were found in regions corresponding to the architectonic fields 3b and 1. the two representations were roughly mirror-images of each other, with receptive field locations matched for recording sites along the common border. as in other mon ...19836860957
microscopic pathology of liver of capuchin monkey (cebus albifrons) infected with athesmia foxi (dicrocoelidae : trematoda) : a pictorial illustration.histopathological changes in the livers of two white fronted capuchin monkeys, cebus albifrons, associated with athesmia foxi (dicrocoelidae : trematoda) infection are illustrated through photomicrographic plates. the lesions are confined in and around the hepatic biliary system. the bile ducts are greatly distended and thickened because of fibroblastic activity and collagen deposit in its walls. in one of the livers desquamative, necrotic and reorganizational changes are found to be well marked ...19807258041
the early development of the nervous system in staged insectivore and primate embryos.the early development of the nervous system was studied in stage embryos of hemicentetes semispinosus, microcebus murinus, alouatta seniculus, cebus appella, cebus albifrons, macaca mulatta, and homo sapiens. the specimens were assigned to carnegie stages 11-13. serial transverse sections were examined and graphic reconstructions were prepared. the early development of the neural tube is basically similar in all the species investigated but differences in detail are noticeable. the mesencephalic ...19807440789
postnatal growth allometry of the extremities in cebus albifrons and cebus apella: a longitudinal and comparative study.cebus albifrons and cebus apella, partially sympatric capuchin monkeys from south america, are known to differ substantially in adult body mass and bodily proportions. c. apella possesses a robust, stocky build in contrast to the more gracile, relatively longer limbed body design of c. alblfrons. average birth weights and adult body lengths of these two congeners, however, are remarkably similar and do not serve to distinguish them. this study examines longitudinal growth rates and patterns of o ...19807468784
primate phylogeny studied by comparative determinant analysis. a preliminary report.in this preliminary report the divergence times for the major primate groups are given, calculated from a study by comparative determinant analysis of 69 proteins (equaling 0.1% of the whole genetic information). with an origin of the primate order set at 80 million years before present, the ages of the last common ancestors (lcas) of man and the major primate groups obtained this way are as follows: pan troglodytes 5.2; gorilla gorilla 7.4; pongo pygmaeus 19.2; hylobates lar 20.3; old world mon ...19938398202
population status and conservation of red howling monkeys and white-fronted capuchin monkeys in trinidad. 19958529973
mechanisms of action of light on circadian rhythms in the monkey.light is considered by many investigators to be the primary zeitgeber for most physiologic rhythms. in order to study the effects on biorhythms of changing photoperiods and to provide information on the nature of the wave forms and the mechanisms of entrainment, unrestrained male monkeys (cebus albifrons, macaca nemestrina) were maintained in a sound-proofed environmental chamber. the cebus was initially maintained on a 12l:12d schedule; it was subjected to a 180 degrees phase shift for 14 days, ...197011826886
reconstructing the mechanics of quadrupedalism in an extinct hominoid.traditionally, analogising comparative anatomical approaches, working on features of individual bony elements, have led to the miocene hominoids proconsul heseloni and p. nyanzae being described as arboreal, with a variety of possible locomotion modes. whilst most researchers seemingly agree that quadrupedal was one of the most frequently adopted modes, any deeper knowledge about the kinematical characteristics of such quadrupedalism is very limited. based on the previous studies and a computer ...200212050897
rflp analysis of mtdna from six platyrrhine genera: phylogenetic inferences.this study investigates the phylogenetic relationships of 10 species of platyrrhine primates using rflp analysis of mtdna. three restriction enzymes were used to determine the restriction site haplotypes for a total of 276 individuals. phylogenetic analysis using maximum parsimony was employed to construct phylogenetic trees. we found close phylogenetic relationships between alouatta, lagothrix and ateles. we also found a close relationship between cebus and aotus, with saimiri clustering with t ...200312759493
enamel and dentine development and the life history profile of victoriapithecus macinnesi from maboko island, kenya.two permanent lower second molar teeth (knm-mb 19841 and knm-mb 27844) attributed to victoriapithecus macinnesi were prepared for histological analysis. a further five male and three female canine teeth were replicated with a silicone impression material and perikymata counts subsequently made on epoxy casts over the whole crown surface. daily enamel cross striations averaged 6 microm apart in both cuspal and lateral enamel of the molars and the total crown formation times were approximately 1.2 ...200415646271
primate population densities in three nutrient-poor amazonian terra firme forests of south-eastern colombia.we censused primate populations at three non-hunted 'terra firme' forests of south-eastern colombian amazonia. the aggregate biomass densities of diurnal primates at all sites were amongst the lowest recorded for any non-hunted forest in western amazonia and elsewhere in the neotropics. densities of red howler monkeys were low, as is typical in amazonian terra firme forests far removed from white-water rivers, and densities of woolly monkeys were 1.5-3.5 times lower than those estimated for this ...200515900101
molecular evolution of prolactin in primates.pituitary prolactin, like growth hormone (gh) and several other protein hormones, shows an episodic pattern of molecular evolution in which sustained bursts of rapid change contrast with long periods of slow evolution. a period of rapid change occurred in the evolution of prolactin in primates, leading to marked sequence differences between human prolactin and that of nonprimate mammals. we have defined this burst more precisely by sequencing the coding regions of prolactin genes for a prosimian ...200515983870
evolution of growth hormone in primates: the gh gene clusters of the new world monkeys marmoset (callithrix jacchus) and white-fronted capuchin (cebus albifrons).the gh gene cluster in marmoset, callithrix jacchus, comprises eight gh-like genes and pseudogenes and appears to have arisen as a consequence of gene duplications occurring independently of those leading to the human gh gene cluster. we report here the complete sequence of the marmoset gh gene locus, including the intergenic regions and 5' and 3' flanking sequence, and a study of the multiple gh-like genes of an additional new world monkey (nwm), the white-fronted capuchin, cebus albifrons. the ...200617009125
ontogeny of long bone geometry in capuchin monkeys (cebus albifrons and cebus apella): implications for locomotor development and life history.studies of a diverse array of animals have found that young individuals often have robust bones for their body size (i.e. augmented cross-sectional dimensions), limiting fracture risk despite general musculoskeletal immaturity. however, previous research has focused primarily on precocial taxa (e.g. rodents, lagomorphs, bovids, goats and emu). in this study, we examined the ontogenetic scaling of humeral and femoral cross-sectional robusticity in a mixed-longitudinal sample of two slow-growing, ...201019864273
comparative analysis of muscle architecture in primate arm and forearm.a comparative study of myological morphology, i.e. muscle mass (mm), muscle fascicle length and muscle physiological cross-sectional area (an indicator of the force capacity of muscles), was conducted in nine primate species: human (homo sapiens), chimpanzee (pan troglodytes), gibbon (hylobates spp.), papio (papio hamadryas), lutong (trachypithecus francoisi), green monkey (chlorocebus aethiops), macaque monkey (macaca spp.), capuchin monkey (cebus albifrons) and squirrel monkey (saimiri sciureu ...201019958344
tail growth tracks the ontogeny of prehensile tail use in capuchin monkeys (cebus albifrons and c. apella).physical anthropologists have devoted considerable attention to the structure and function of the primate prehensile tail. nevertheless, previous morphological studies have concentrated solely on adults, despite behavioral evidence that among many primate taxa, including capuchin monkeys, infants and juveniles use their prehensile tails during a greater number and greater variety of positional behaviors than do adults. in this study, we track caudal vertebral growth in a mixed longitudinal sampl ...201121953012
[leptospiral antibodies in a colombian zoo's neotropical primates and workers].detecting antibodies against leptospira spp. in neotropical primates and workers in a colombian zoo and identifying the risk factors associated with the disease.201122634948
interspecific infanticide and infant-directed aggression by spider monkeys (ateles hybridus) in a fragmented forest in colombia.interspecific aggression amongst nonhuman primates is rarely observed and has been mostly related to scenarios of resource competition. interspecific infanticide is even rarer, and both the ultimate and proximate socio-ecological factors explaining this behavior are still unclear. we report two cases of interspecific infanticide and five cases of interspecific infant-directed aggression occurring in a well-habituated primate community living in a fragmented landscape in colombia. all cases were ...201222767357
successive radiations, not stasis, in the south american primate fauna.the earliest neotropical primate fossils complete enough for taxonomic assessment, dolichocebus, tremacebus, and chilecebus, date to approximately 20 ma. these have been interpreted as either closely related to extant forms or as extinct stem lineages. the former hypothesis of morphological stasis requires most living platyrrhine genera to have diverged before 20 ma. to test this hypothesis, we collected new complete mitochondrial genomes from aotus lemurinus, saimiri sciureus, saguinus oedipus, ...200919321426
primate abundance and habitat preferences on the lower urubamba and tambo rivers, central-eastern peruvian amazonia.we report information on population density, group size, and habitat preferences of primates along the lower río urubamba and in the río urubamba-río tambo interfluvium, in central-eastern peruvian amazonia, an area that has been little explored with regard to its primate fauna. during 425 km of transect walks in october-november 2008 and april-may 2009 totally 174 groups of nine primate species were encountered, the most common being callicebus brunneus (45 groups), saguinus imperator (41 group ...201323661029
sexual dimorphism in the postcranial skeleton of new world primates.this study examines sexual dimorphism in 24 dimensions of the postcranial skeleton of four platyrrhine species: callithrix jacchus, saguinus nigricollis, saimiri sciureus, and cebus albifrons. the two callitrichid species show a relatively small amount of variation in the degree of sexual dimorphism among the different dimensions. variation is considerably higher in the two cebid species as reflected by a mosaic pattern of sexual dimorphisms with males being significantly larger than females in ...19854043875
assessing habitat utilization by neotropical primates: a new approach.this study aims to ascertain habitat utilization, in relation to forest structural variation, by a multi-species group of primates in tropical lowland rainforest in southeast peru during dry season. a new approach to assessing habitat utilization was used. habitat variation was described by structural and indicator variables collected in quadrats along transects through a study area within terra firme and floodplain forest. variables were grouped into 'factors' accounting for most of the variati ...200212091748
the involucrin genes of the white-fronted capuchin and cottontop tamarin: the platyrrhine middle region.in all anthropoid species, the coding region of the involucrin gene contains a segment of short tandem repeats that were added sequentially, beginning in a common anthropoid ancestor. the involucrin coding region of each of two platyrrhine species, the white-fronted capuchin (cebus albifrons) and the cottontop tamarin (saguinus oedipus), has now been cloned and sequenced. these genes share with the genes of the catarrhines the repeats added in the common anthropoid lineage (the early region). af ...19911766360
development and eruption of the mandibular cheek teeth in cebus albifrons.the development and eruption of the mandibular cheek teeth of cebus albifrons is described from a longitudinal series of whole body radiographs. males are generally ahead of females in both development and eruption times. the dental development and eruption in c. albifrons is intermediate between the smaller new world primates and the larger catarrhines.19827129251
genus cebus q- and g-band karyotypes and natural hybrids.the q- and g-band analyses of cebus capucinus, cebus albifrons and cebus apella are presented. the study is based on the results obtained from 18 specimens of the genus. for almost all of them, their exact locality is known. the data presented include the statement of two natural hybrids from c. capucinus and c. albifrons. on an evolutionary basis our results agree with the taxonomic concepts which postulate more similarity between c. capucinus and c. albifrons than between c. capucinus and c. a ...1976827485
banding patterns of the chromosomes of cebus albifrons. comparative study with cebur apella.quinacrine- and giemsa-banding studies of the chromosomes of cebus albifrons permitted to obtain a pattern that characterizes the species. the topography of the bands has been compared with that of cebus apella. each chromosome pair of c. albifrons has a homologue in c. apella. the differences between the two karyotypes are the result of five pericentric inversions.1976819340
noradrenergic control of circadian rhythms in cebus albifrons. 19734347668
primate hemoglobins: their structure, function and evolution. i. amino acid compositions of the tryptic peptides from the beta chain of cebus albifrons. 19715002362
cholesterol ester content of the serum: alterations due to simple and complex carbohydrate diets in nonhuman primates (cebus albifrons, macaca arctoides, and macaca mulatta). 19715003646
gastrointestinal parasites in captive and free-ranging cebus albifrons in the western amazon, ecuador.currently, there is a lack of surveys that report the occurrence of gastrointestinal parasites in the white-headed capuchin monkey (cebus albifrons). we therefore assessed the presence and richness (= number of different parasite genera) of parasites in c. albifrons in wildlife refuges (n = 11) and in a free-ranging group near a human village (n = 15) in the ecuadorian amazon. in the 78 samples collected (median of 3 samples per animal), we identified a total of 6 genera of gastrointestinal para ...201728808619
the japan monkey centre primates brain imaging repository for comparative neuroscience: an archive of digital records including records for endangered species.advances in magnetic resonance imaging (mri) and computational analysis technology have enabled comparisons among various primate brains in a three-dimensional electronic format. results from comparative studies provide information about common features across primates and species-specific features of neuroanatomy. investigation of various species of non-human primates is important for understanding such features, but the majority of comparative mri studies have been based on experimental primat ...201830357587
sexual dimorphism and interspecific cranial form in two capuchin species: cebus albifrons and c. apella.ontogenetic patterns of sexual dimorphism and cranial form in two capuchin monkeys, cebus albifrons and c. apella, are investigated by means of univariate, bivariate, and multivariate statistics. the analyses are based on 23 linear variables. univariate analyses indicate that similar ontogenetic patterns of cranial sexual dimorphism are present; however, interspecific differences exist in timing. ontogenetic scaling is present in both species' crania; however, it is more prevalent in c. albifron ...19979453698
the apo e/apo ciii molar ratio affects removal of cholesterol ester from modified human lipoproteins injected into cebus monkeys.the removal of postprandial (pp) and postabsorptive (pa) human ldl and hdl cholesterol was examined in cebus monkeys (cebus albifrons) following in vitro labelling of these lipoproteins by 3h-cholesterol in the presence or absence of dtnb. the removal of ldl cholesteryl ester was 3.5 and 2 times greater than that of hdl in male and female monkeys, respectively. incubation with dtnb reduced cholesteryl ester removal by 45 and 52% for ldl and hdl, respectively. cholesteryl ester from pa lipoprotei ...19863959759
pargyline reduces/prevents neuroleptic-induced acute dystonia in monkeys.the neuropharmacologic mechanisms underlying neuroleptic-induced extrapyramidal syndromes (eps) were studied using a nonhuman primate model. twenty-six cebus albifrons monkeys were given weekly challenges of haloperidol (0.025 mg/kg im), and half of the animals received the monoamine oxidase (mao) inhibitor pargyline (5 mg/kg po) daily for 17 consecutive days during the protocol. pargyline caused no changes in baseline behaviors, but significantly reduced haloperidol-induced acute dystonia (ad) ...19872827216
effect of dietary fat saturation and cholesterol on ldl composition and metabolism. in vivo studies of receptor and nonreceptor-mediated catabolism of ldl in cebus monkeys.the mechanism(s) by which polyunsaturated fats reduce low density lipoprotein (ldl) cholesterol and apolipoprotein (apo) b were investigated in 20 cebus monkeys (cebus albifrons) fed diets containing corn oil or coconut oil as fat (31% of calories) with or without dietary cholesterol (0.1% by weight) for 3 to 10 years. coconut-oil feeding compared to corn-oil feeding resulted in significant increases in levels of plasma total cholesterol (176%), very low density lipoprotein (vldl)-ldl cholestero ...19902297342
autonomic concomitants of discriminative avoidance and punishment training in the monkey.two cebus albifrons monkeys were trained to press a back-lighted panel to postpone a brief electric shock to the tail using a sidman avoidance schedule (ss = 40 sec, rs = 40 sec). after 25 training sessions, a discriminative schedule was introduced, with the sidman avoidance continuing in the presence of one discriminative stimulus and punishment introduced in the presence of the other. the discriminative stimuli were colors on the panel. discriminative training also involved 25 sessions, each w ...1979264019
loss and recovery of reactivity to noxious stimuli in monkeys with primary spinothalamic cordotomies, followed by secondary and tertiary lesions of other cord sectors.cebus albifrons monkeys were trained to escape electrical stimulation of either leg at five intensities, spanning a range from mild tingle to intense but tolerable pain, as judged by human observers who experienced the same stimuli. the average duration of stimulation received by the animals at each intensity was plotted for each leg during the period required for recovery of responsiveness to noxious electrical stimulation following ventrolateral spinal cordotomy. recovery of escape responding ...1979110388
the mystery of the origins of cebus albifrons malitiosus and cebus albifrons hypoleucus: mitogenomics and microsatellite analyses revealed an amazing evolutionary history of the northern colombian white-fronted capuchins.knowledge of the genetic units of species is fundamental to the conservation of biodiversity. this is true for all regions, including the neotropics where the earth has its greatest diversity, including roughly 34% of primate species, a group that has almost 60% of its taxa threatened with extinction. the untufted (gracile) capuchins are medium-sized neotropical primates, traditionally classified in four species: cebus albifrons, c. capucinus, c. olivaceus, and c. kaapori. they have a very confu ...201930822184
new records of the critically endangered ecuadorian white-fronted capuchin (cebus aequatorialis) detected by remote cameras.the ecuadorian white-fronted capuchin (cebus aequatorialis) is classified as critically endangered (cr) on the iucn red list at both international and national levels in ecuador, and the majority of detections have been recorded from direct observation. in this work, we report the occurrence of this species in a new location in the coastal region of ecuador recorded by remote cameras. overall, eight separate detections were recorded by three unique cameras from 19 aug to 10 dec 2016, over seven ...202031915955
conditional fear, anxiety, and morphine-seeking behavior.two cebus albifrons monkeys were given discriminative operant conditioning with visual stimuli, with sidman avoidance and punishment as the components. the instrumental response was an unelicited increase in skin conductance. both animals had surgically implanted catheters for automatic injection of morphine into the heart. after autonomic conditioning, the animals were given the opportunity to self-administer the morphine by touching the primate press panel that displayed the visual stimuli. on ...19817197345
movement and electromyographic disorders associated with cerebellar dysmetria.the objective of these experiments was to determine whether dysmetric elbow flexions, which occurred during cerebellar dysfunction, had the same kinematic and electromyographic characteristics as movements of the same amplitude and velocity performed under normal conditions. reversible cerebellar lesions were produced by cooling through two probes implanted on either side of the dentate nucleus in five cebus albifrons monkeys. normal, fast, and accurate elbow flexions had single-peaked velocitie ...19863734856
effect of dietary fat saturation and cholesterol on low density lipoprotein degradation by mononuclear cells of cebus monkeys.the mechanism by which dietary unsaturated fatty acids lower low density lipoprotein (ldl) cholesterol is unknown. unsaturated fatty acids incorporated into the cell membrane can increase membrane fluidity and, as a result, dramatically alter membrane-dependent cell functions. therefore, we examined the effect of long-term dietary consumption of corn oil and coconut oil with and without cholesterol in amounts equivalent to those of a typical western diet on the degradation of human ldl by periph ...19892590069
variations in sexual behavior among capuchin monkeys function for conspecific mate recognition: a phylogenetic analysis and a new hypothesis for female proceptivity in tufted capuchins.researchers of capuchin monkeys have noted stereotyped body postures, facial expressions, and vocalizations that accompany copulations in this genus. notable variations in these sexual behaviors are observed across capuchin species. although several hypotheses exist to explain variation in the duration and vigor of sexual behaviors across species, there is no proposed explanation for variation in the forms of these behaviors. i hypothesized that the forms of sexual behaviors function as recognit ...201122038882
hand preferences and differences in extractive foraging in seven capuchin monkey species.tool use and extractive foraging could be drivers for right hand use preference. the robust capuchins, sapajus, are more specialized for destructive and extractive foraging than the gracile capuchins, cebus. thus, we predicted them to show right-hand preference and higher rates of extractive foraging when compared to the gracile capuchins. we hypothesized that capuchins that evolved in dry habitats are predisposed to show higher rates of extractive foraging and right-hand preference. we employed ...201830088664
high-resolution chromosome banding studies in cebus apella, cebus albifrons, and lagothrix lagothricha: comparison with the human karyotype.karyotypes of three species of south american primates (cebus apella, cebus albifrons, and lagothrix lagothricha) were studied using high-resolution banding techniques, and were compared to the human karyotype. the number of homologies was very high for the three species. some of the breakpoints implicated in chromosome rearrangements corresponded with human fragile sites. the fragile sites in human chromosomes often correspond with the localization of latent centromeres in the platyrrhines or w ...198731973485
contiguous distribution of two species of cebus monkeys in el tuparro national park, colombia.the geographic distribution of two congeneric monkeys (cebus albifrons and c. apella) was studied in el tuparro national park in the llanos of eastern colombia. extensive trips were undertaken by land and river to collect 268 precisely located groups of these two species. the distributions of these monkeys were generally mutually exclusive and parapatric, contrasting with their known sympatry in closed-canopy rainforest farther to the south. the replacement of one species by the other was abrupt ...198531986821
megaloblastic anemia and the requirement for folic acid in the cebus monkey (cebus albifrons).to study the development of folic acid deficiency, nine 3-year-old cebus monkeys (cebus albifrons) were fed purified diets containing varying amounts of added folic acid. monkeys fed the diet without added vitamin stopped growing and then lost weight. macrocytic anemia and leukopenia developed, and megaloblastic changes were observed in precursors of both erythrocytes and leukocytes in the bone marrow. urinary excretion of formiminoglutamic acid was increased significantly in these animals compa ...198232197568
growth and developmental body composition of the cebus monkey (cebus albifrons).the carcasses of 37 cebus albifrons, colombia (19 male, 17 female, 1 unknown) with ages ranging from premature stillborn to 8 yr, were analyzed for body composition. the absolute content of water, protein, fat, and ash were determined by standard techniques and were analyzed as functions of carcass weight and age. the weight of the carcass was directly proportional to the whole body weight over the entire range of weights studied. all parameters but fat were linearly related to carcass weight; t ...198231991993
experimental maternal and neonatal folate status relationships in nonhuman primates.the influence of maternal dietary folic acid intake on folate status was studied in cebus albifrons monkeys by feeding 10 or 250 micrograms/100 kcal dietary folic acid during pregnancy and 4 wk postpartum. maternal, infant, and nonpregnant hematologic indices; blood and liver folate concentrations; and urinary formiminoglutamic acid excretion all varied with dietary folate intake and pregnancy status as did milk folate concentration in lactating dams. maternal folate status, determined by plasma ...19892750684
tool use in wild capuchin monkeys (cebus albifrons trinitatis).white-fronted capuchins were observed to use leaves as cups to retrieve water from tree cavities. on multiple occasions several individuals performed this behavior. thus, these capuchins engage in habitual tool use, as defined by mcgrew's classificatory scheme of tool using behavior.19989802515
abundance, diversity, and patterns of distribution of primates on the tapiche river in amazonian peru.this work presents data on the relative diversity, abundance, and distribution patterns of primates in a 20 km2 area of the tapiche river in the peruvian amazon. population data were collected while the study area was both inundated and dry (march to september 1997) using conventional line-transect census techniques. survey results reflected the presence of 11 primate species, but population parameters on only eight of the species will be presented, including saddleback tamarins (saguinus fuscic ...200111376449
[genetic methods for the reintroduction of primates saguinus, aotus and cebus (primates: cebidae) seized in bogota, colombia].primates are one of more confiscated taxa by the environmental authorities in bogota, colombia. during 2008, 133 monkeys were confiscated; samples from 115 of them were sequenced by the mitochondrial cythocrome oxidase ii gene (mtcoii) and 112 sequences obtained were of high quality. these sequences were compared with those obtained by our research group from individuals directly sampled in the field, with precise geographic origin. so, a more specific geographic area of the colombian territory ...201020737854
co-infection with filarial nematodes in sapajus macrocephalus and cebus albifrons (primates: cebidae) from the peruvian amazon.dipetalonema caudispina (molin, 1858) and d. gracile (rudolphi, 1809) (filarioidea: onchocercidae) are two of six known species of filarial nematodes that parasitize neotropical non-human primates. adult filariae were collected from the thoracic and abdominal cavities of 38 of 44 specimens of sapajus macrocephalus (spix, 1823) and nine of ten specimens of cebus albifrons (humboldt, 1812) (primates: cebidae), distributed in the yavarí-mirín river basin and used locally for human consumption. co-o ...201929606157
tooth-root form and function in platyrrhine seed-eaters.research into the functional and adaptive basis of tooth crown form has provided a useful framework for the inference of diet in extinct primates. however, our understanding of variation in tooth-root form is limited. studies within the clinical literature emphasize the influence of tooth-root surface area on stress resistance, but it is not known if root form has diversified during primate evolution in relation to dietary specialization. this hypothesis was tested by quantifying maxillary canin ...200314614754
molecular phylogenetics and phylogeography of the white-fronted capuchin (cebus albifrons; cebidae, primates) by means of mtcoii gene sequences.a total of 696 base pairs (bp) of the mitochondrial coii gene were sequenced from 118 individuals of cebus albifrons (plus an individual of cebus olivaceus) sampled from diverse geographical areas of colombia, peru, ecuador and brazil. these animals represented all of the c. albifrons's taxa described by hershkovitz (1949) in colombia and peru (10 out of 13 subspecies are described by this author). the sequences analyzed demonstrate the existence of three well defined groups in northern colombia ...201020854917
cebus phylogenetic relationships: a preliminary reassessment of the diversity of the untufted capuchin monkeys.the untufted, or gracile, capuchin monkeys are currently classified in four species, cebus albifrons, c. capucinus, c. olivaceus, and c. kaapori, with all but c. kaapori having numerous described subspecies. the taxonomy is controversial and their geographic distributions are poorly known. cebus albifrons is unusual in its disjunct distribution, with a western and central amazonian range, a separate range in the northern andes in colombia, and isolated populations in trinidad and west of the and ...201222311697
the effect of dietary adaption on cranial morphological integration in capuchins (order primates, genus cebus).a fundamental challenge of morphology is to identify the underlying evolutionary and developmental mechanisms leading to correlated phenotypic characters. patterns and magnitudes of morphological integration and their association with environmental variables are essential for understanding the evolution of complex phenotypes, yet the nature of the relevant selective pressures remains poorly understood. in this study, the adaptive significance of morphological integration was evaluated through th ...201223110039
mitochondrial dna diversity in the acanthocephalan prosthenorchis elegans in colombia based on cytochrome c oxidase i (coi) gene sequence.prosthenorchis elegans is a member of the phylum acanthocephala and is an important parasite affecting new world primates in the wild in south america and in captivity around the world. it is of significant management concern due to its pathogenicity and mode of transmission through intermediate hosts. current diagnosis of p. elegans is based on the detection of eggs by coprological examination. however, this technique lacks both specificity and sensitivity, since eggs of most members of the gen ...201526759793
grasping primate development: ontogeny of intrinsic hand and foot proportions in capuchin monkeys (cebus albifrons and sapajus apella).young primates have relatively large hands and feet for their body size, perhaps enhancing grasping ability. we test the hypothesis that selection for improved grasping ability is responsible for these scaling trends by examining the ontogeny of intrinsic hand and foot proportions in capuchin monkeys (cebus albifrons and sapajus apella). if selection for improved grasping ability is responsible for the observed patterns of hand and foot growth in primates, we predicted that fingers and toes woul ...201627324663
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