Vocalization in the squirrel monkey (Saimiri sciureus) elicited by brain stimulation

1967 ◽  
Vol 4 (2) ◽  
Author(s):  
U. J�rgens ◽  
M. Maurus ◽  
D. Ploog ◽  
P. Winter
Keyword(s):  
Squirrel Monkey ◽  
Brain Stimulation ◽  
Saimiri Sciureus

Morphology and mitochondrial phylogenetics reveal that the Amazon River separates two eastern squirrel monkey species: Saimiri sciureus and S. collinsi

2015 ◽  
Vol 82 ◽  
pp. 426-435 ◽  
Author(s):  
Michelle P. Mercês ◽  
Jessica W. Lynch Alfaro ◽  
Wallax A.S. Ferreira ◽  
Maria L. Harada ◽  
José S. Silva Júnior
Keyword(s):  
Squirrel Monkey ◽  
Saimiri Sciureus ◽  
Amazon River ◽  
Monkey Species

Production of Zinc Deficiency in the Squirrel Monkey (Saimiri sciureus)

1967 ◽  
Vol 93 (4) ◽  
pp. 499-510 ◽  
Author(s):  
M. P. Macapinlac ◽  
G. H. Barney ◽  
W. N. Pearson ◽  
W. J. Darby
Keyword(s):  
Squirrel Monkey ◽  
Zinc Deficiency ◽  
Saimiri Sciureus

Terminal 13p deletion in squirrel monkey (Saimiri sciureus ) with differentiated phenotype

2018 ◽  
Vol 47 (6) ◽  
pp. 412-415
Author(s):  
B. Goldschmidt ◽  
C.A.A. Lopes ◽  
F. Resende ◽  
T.A. Pissinatti ◽  
D.C. Toledo ◽  
...  
Keyword(s):  
Squirrel Monkey ◽  
Saimiri Sciureus

scholarly journals Sexual dimorphism in the squirrel monkey, Saimiri sciureus (Linnaeus, 1758) and Saimiri ustus (I. Geoffroy, 1844) (Primates, Cebidae)

2009 ◽  
Vol 69 (1) ◽  
pp. 171-174 ◽  
Author(s):  
B. Goldschmidt ◽  
A. Mota-Marinho ◽  
C. Araújo-Lopes ◽  
MA. Brück-Gonçalves ◽  
D. Matos-Fasano ◽  
...  
Keyword(s):  
Body Weight ◽  
Sexual Dimorphism ◽  
Squirrel Monkey ◽  
Coat Color ◽  
Morphological Characters ◽  
Saimiri Sciureus ◽  
External Ear ◽  
Adult Females ◽  
In The Wild ◽  
Capture Techniques

Causes and implications of sexual dimorphism have been studied in several different primates using a variety of morphological characters such as body weight, canine length, coat color and ornamentation. Here we describe a peculiar coat color characteristic in the squirrel monkey that is present only in adult females over five years old and which increases with age. Neither males nor young animals manifest this phenomenon, which is characterized by a spot of black hairs located anteriorly to the external ear (pinna). This characteristic could be used to discriminate adult females of Saimiri sciureus in the wild without the need of capture techniques.

Direct and Indirect Corticospinal Control of Arm and Hand Motoneurons in the Squirrel Monkey (Saimiri sciureus)

1997 ◽  
Vol 78 (2) ◽  
pp. 721-733 ◽  
Author(s):  
M. A. Maier ◽  
E. Olivier ◽  
S. N. Baker ◽  
P. A. Kirkwood ◽  
T. Morris ◽  
...  
Keyword(s):  
Squirrel Monkey ◽  
Macaque Monkey ◽  
Saimiri Sciureus ◽  
Excitatory Postsynaptic Potential ◽  
Onset Latency ◽  
Implanted Electrodes ◽  
Postsynaptic Potential ◽  
Common Response ◽  
Hand Muscle ◽  
Comparable Sample

Maier, M. A., E. Olivier, S. N. Baker, P. A. Kirkwood, T. Morris, and R. N. Lemon. Direct and indirect corticospinal control of arm and hand motoneurons in the squirrel monkey ( Saimiri sciureus). J. Neurophysiol. 78: 721–733, 1997. Anatomic evidence suggests that direct corticomotoneuronal (CM) projections to hand motoneurons in the New World squirrel monkey ( Saimiri sciureus) are weak or absent, but electrophysiological evidence is lacking. The nature of the corticospinal linkage to these motoneurons was therefore investigated first with the use of transcranial magnetic stimulation (TMS) of the motor cortex under ketamine sedation in five monkeys. TMS produced early responses in hand muscle electromyogram, but thresholds were high (compared with macaque monkey) and the onset latency was variable. Second, stimulation of the pyramidal tract (PT) was carried out with the use of chronically implanted electrodes in ketamine-sedated monkeys; this produced more robust responses that were markedly facilitated by repetitive stimulation, with little decrease in latency on the third compared with the first shock. Finally, postsynaptic potentials were recorded intracellularly from 93 arm and hand motoneurons in five monkeys under general chloralose anesthesia. After a single PT stimulus, the most common response was a small, slowly rising excitatory postsynaptic potential (EPSP), either alone (35 of 93 motoneurons) or followed by an inhibitory postsynaptic potential (39 of 93). The segmental delay of the early EPSPs was within the monosynaptic range (mean 0.85 ms); however, the rise time of these EPSPs was slow (mean 1.3 ms) and their amplitude was small (mean 0.74 mV). These values are significantly slower and smaller than EPSPs in a comparable sample of Old World macaque monkey motoneurons. The results show that CM connections do exist in the squirrel monkey but that they are weak and possibly located on the remote dendrites of the motoneurons. The findings are consistent with earlier anatomic studies. Repetitive PT stimulation produced large, late EPSPs in some motoneurons, suggesting that, in this species, there are relatively strong nonmonosynaptic pathways linking the corticospinal tract to hand motoneurons.

scholarly journals The mitochondrial genome of Dipetalonema gracile from a squirrel monkey in China

2018 ◽  
Vol 94 ◽  
Author(s):  
P. Zhang ◽  
R.K. Ran ◽  
A.Y. Abdullahi ◽  
X.L. Shi ◽  
Y. Huang ◽  
...  
Keyword(s):  
Mitochondrial Genome ◽  
Squirrel Monkey ◽  
Complete Mitochondrial Genome ◽  
Mitochondrial Gene ◽  
Rrna Genes ◽  
Saimiri Sciureus ◽  
Trna Genes ◽  
Loop Structure ◽  
Protein Coding ◽  
Protein Coding Genes

AbstractDipetalonema gracile is a common parasite in squirrel monkeys (Saimiri sciureus), which can cause malnutrition and progressive wasting of the host, and lead to death in the case of massive infection. This study aimed to identify a suspected D. gracile worm from a dead squirrel monkey by means of molecular biology, and to amplify its complete mitochondrial genome by polymerase chain reaction (PCR) and sequence analysis. The results identified the worm as D. gracile, and the full length of its complete mitochondrial genome was 13,584 bp, which contained 22 tRNA genes, 12 protein-coding genes, two rRNA genes, one AT-rich region and one small non-coding region. The nucleotide composition included A (16.89%), G (20.19%), T (56.22%) and C (6.70%), among which A + T = 73.11%. The 12 protein-coding genes used TTG and ATT as start codons, and TAG and TAA as stop codons. Among the 22 tRNA genes, only trnS1AGN and trnS2UCN exhibited the TΨC-loop structure, while the other 20 tRNAs showed the TV-loop structure. The rrnL (986 bp) and rrnS (685 bp) genes were single-stranded and conserved in secondary structure. This study has enriched the mitochondrial gene database of Dipetalonema and laid a scientific basis for further study on classification, and genetic and evolutionary relationships of Dipetalonema nematodes.

Studies of the squirrel monkey, Saimiri sciureus, genome

1977 ◽  
Vol 19 (1) ◽  
pp. 14-25 ◽  
Author(s):  
Y.-F. Lau ◽  
F.E. Arrighi ◽  
C.R. Chuang
Keyword(s):  
Squirrel Monkey ◽  
Saimiri Sciureus
Sign in / Sign up

Export Citation Format

Share Document