Topic
Dusky leaf monkey
About: Dusky leaf monkey is a research topic. Over the lifetime, 19 publications have been published within this topic receiving 174 citations. The topic is also known as: Trachypithecus obscurus.
Papers
TL;DR: Biological assays revealed that the higher the negative charge of exopolysaccharides the stronger was their inhibiting effect, and a model is proposed where peptides with an α‐helical conformation interact with exopolySaccharides through electrostatic and other non‐covalent interactions.
Abstract: The interaction of bacterial exopolysaccharides, produced by opportunistic lung pathogens, with antimicrobial peptides of the innate primate immune system was investigated. The exopolysaccharides were produced by Pseudomonas aeruginosa, Inquilinus limosus and clinical isolates of the Burkholderia cepacia complex, bacteria that are all involved in lung infections of cystic fibrosis patients. The effects of the biological activities of three orthologous cathelicidins from Homo sapiens sapiens, Pongo pygmaeus (orangutan) and Presbitys obscurus (dusky leaf monkey) were examined. Inhibition of the antimicrobial activity of peptides was assessed using minimum inhibitory concentration assays on a reference Escherichia coli strain in the presence and absence of exopolysaccharides, whereas complex formation between peptides and exopolysaccharides was investigated by means of circular dichroism, fluorescence spectroscopy and atomic force microscopy. Biological assays revealed that the higher the negative charge of exopolysaccharides the stronger was their inhibiting effect. Spectroscopic studies indicated the formation of molecular complexes of varying stability between peptides and exopolysaccharides, explaining the inhibition. Atomic force microscopy provided a direct visualization of the molecular complexes. A model is proposed where peptides with an alpha-helical conformation interact with exopolysaccharides through electrostatic and other non-covalent interactions.
52 citations
TL;DR: A moderate degree of sexual dimorphism thus exists in this species, female body weight representing 88% that of the male and no seasonal variation in the adult body weight or total gonadal weight of either sex occurs.
Abstract: Data from 25 male and 44 female free-ranging dusky leaf monkeys, Presbytis obscura,are analyzed. In a male the mean total testicular weight, 5.82 g, represents 0.078% of the mean adult body weight, 7.39 kg. The mean total ovarian weight, 0.52 g, represents 0.008% of the mean female adult body weight, 6.47 kg. A moderate degree of sexual dimorphism thus exists in this species, female body weight representing 88% that of the male. No seasonal variation in the adult body weight or total gonadal weight of either sex occurs. Only in males is there a strong positive correlation between left and right gonadal weight, and no correlation exists between the total gonadal weight and the estimated age of either male or female adults. Among adults, only females evince a significant positive correlation between total gonadal weight and body weight. No marked change in total ovarian weight occurs during the menstrual cycle, pregnancy, or lactation.
11 citations
TL;DR: Implantation in the dusky leaf monkey, Presbytis obscura, is superficial; the placenta is of the double discoid villous haemochorial type and immediately prior to implantation the thick endometrium contains highly active uterine glands.
10 citations
1 Jan 2012
TL;DR: Stable isotope analysis on eight mammalian species tested the hypothesis that the differences in diet and habitat types among species, guilds and foraging strategies are refl ected in the δ 15 N and δ 13 C signatures of their tissues, and the brush-tailed porcupine showed the most divergent isotopic signatures.
Abstract: We performed stable isotope analysis on eight mammalian species: pig-tailed macaque (Macaca nemestrina), long-tailed macaque (M. fascicularis), dusky leaf monkey (Trachypithecus obscurus), brush-tailed porcupine (Atherurus macrourus), wild boar (Sus scrofa), lesser mouse-deer (Tragulus javanicus), greater mouse-deer (T. napu), and barking deer (Muntiacus muntjac), to test the hypothesis that the differences in diet and habitat types among species, guilds and foraging strategies are refl ected in the δ 15 N and δ 13 C signatures of their tissues. Whereas the isotopic ratios differed among taxa, the four major isotopic groups observed were: mouse-deer species, primate species, brush-tailed porcupine, and wild boar. The brush-tailed porcupine showed the most divergent isotopic signatures, depleted in both δ 15
10 citations
TL;DR: During the cycle the endometrium underwent changes similar to those decribed for women, baboons and macaques, except that stromal oedema was pronounced and diffuse in the langur, occurring before ovulation and throughout the secretory phase.
Abstract: Specimens of this langur species were available from juvenile, adult and lactating animals. The endometrial sections of non-pregnant adults were dated from the ovarian appearances. During the cycle the endometrium underwent changes similar to those decribed for women, baboons and macaques, except that stromal oedema was pronounced and diffuse in the langur, occurring before ovulation and throughout the secretory phase.
9 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2019 | 4 |
| 2016 | 1 |
| 2014 | 1 |
| 2012 | 2 |
| 2009 | 1 |