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Optimal hunting conditions drive circalunar behavior of a diurnal carnivore (2014)

Broekhuis, F., Grunewalder, S., McNutt, J. W., Macdonald, D. W.

Oxford University Press

In: Behavioral Ecology

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Publication Date: 2014-09-12

Description: Foraging requirements and predation risk shape activity patterns and temporal behavior patterns widely across taxa. Although this has been extensively studied in small mammals, the influence of predation and prey acquisition on the activity and behavior of large carnivores has received little attention. The diurnal activity described as typical for cheetahs ( Acinonyx jubatus ) has been explained in terms of their avoidance of antagonistic interactions with other larger predators. However, a recent study revealed that cheetahs are frequently active at night, especially during periods of full moon. Being both predator and "prey" in an environment with comparatively high densities of larger and competitively dominant nocturnal predator species, we investigated whether cheetah nocturnal behavior could be explained by favorable conditions for 1) predator avoidance or 2) prey acquisition. We used a data set of continuously recorded behavior created using machine-learning techniques on behavioral data collected in the field to transform recorded 2D activity values from radio-collars into 3 distinct behavioral states (feeding, moving, and resting). We found that 32.5% of cheetah feeding behavior occurred at night and that, in the dry season, nocturnal feeding behavior was positively correlated with moonlight intensity. Our results suggest that nocturnal and circalunar behavior of cheetahs is driven by optimal hunting conditions, outweighing the risks of encountering other predators. Using novel methodology, the results provide new insights into the temporal distribution of behavior, contributing to our understanding of the importance of moonlight and season on the behavior patterns of diurnal species.

Print ISSN: 1045-2249

Electronic ISSN: 1465-7279

Topics: Biology

Published by Oxford University Press

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Coagulation factor X activates innate immunity to human species C adenovirus (2012)

K. Doronin ; J. W. Flatt ; N. C. Di Paolo ; [et al.]

American Association for the Advancement of Science (AAAS)

In: Science. 338(6108): 795-8. doi: 10.1126/science.1226625.

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Publication Date: 2012-09-29

Description: Although coagulation factors play a role in host defense for "living fossils" such as horseshoe crabs, the role of the coagulation system in immunity in higher organisms remains unclear. We modeled the interface of human species C adenovirus (HAdv) interaction with coagulation factor X (FX) and introduced a mutation that abrogated formation of the HAdv-FX complex. In vivo genome-wide transcriptional profiling revealed that FX-binding-ablated virus failed to activate a distinct network of nuclear factor kappaB-dependent early-response genes that are activated by HAdv-FX complex downstream of TLR4/MyD88/TRIF/TRAF6 signaling. Our study implicates host factor "decoration" of the virus as a mechanism to trigger an innate immune sensor that responds to a misplacement of coagulation FX from the blood into intracellular macrophage compartments upon virus entry into the cell.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4762479/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4762479/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Doronin, Konstantin -- Flatt, Justin W -- Di Paolo, Nelson C -- Khare, Reeti -- Kalyuzhniy, Oleksandr -- Acchione, Mauro -- Sumida, John P -- Ohto, Umeharu -- Shimizu, Toshiyuki -- Akashi-Takamura, Sachiko -- Miyake, Kensuke -- MacDonald, James W -- Bammler, Theo K -- Beyer, Richard P -- Farin, Frederico M -- Stewart, Phoebe L -- Shayakhmetov, Dmitry M -- AI065429/AI/NIAID NIH HHS/ -- CA141439/CA/NCI NIH HHS/ -- P30ES07033/ES/NIEHS NIH HHS/ -- R01 AI065429/AI/NIAID NIH HHS/ -- R01 CA141439/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2012 Nov 9;338(6108):795-8. doi: 10.1126/science.1226625. Epub 2012 Sep 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Washington, Seattle, WA 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23019612" target="_blank"〉PubMed〈/a〉

Keywords: Adenoviridae Infections/*immunology/metabolism/virology ; Adenoviruses, Human/genetics/*immunology/*metabolism ; Animals ; CHO Cells ; Capsid Proteins/chemistry/genetics/metabolism ; Cell Line, Tumor ; Cricetinae ; Cricetulus ; Cryoelectron Microscopy ; Cytokines/metabolism ; Factor X/chemistry/*metabolism ; Gene Expression Profiling ; Gene Expression Regulation ; Hepatocytes/virology ; Humans ; *Immunity, Innate ; Macrophages/metabolism/virology ; Mice ; Mice, Inbred C57BL ; Molecular Dynamics Simulation ; Mutation ; NF-kappa B/metabolism ; Signal Transduction ; Virus Internalization

Print ISSN: 0036-8075

Electronic ISSN: 1095-9203

Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics

Published by American Association for the Advancement of Science (AAAS)

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Chemical Characterization of Individual Particles and Residuals of Cloud Droplets and Ice Crystals Collected Onboard Research Aircraft in the ISDAC 2008 Study (2013)

N. Hiranuma, S. D. Brooks, R. C. Moffet, A. Glen, A. Laskin, M. K. Gilles, P. Liu, A. M. Macdonald, J. W. Strapp, G. M. McFarquhar

Wiley

In: Journal of Geophysical Research JGR - Atmospheres

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Publication Date: 2013-05-16

Description: [1] Ambient particles and the dry residuals of mixed-phase cloud droplets and ice crystals were collected during the Indirect and Semi-Direct Aerosol Campaign (ISDAC) near Barrow, Alaska, in spring of 2008. The collected particles were analyzed using Computer Controlled Scanning Electron Microscopy with Energy Dispersive X-ray analysis (CCSEM/EDX) and Scanning Transmission X-ray Microscopy coupled with Near Edge X-ray Absorption Fine Structure spectroscopy (STXM/NEXAFS) to identify physico-chemical properties that differentiate cloud-nucleating particles from the total aerosol population. A wide range of individually mixed components was identified in the ambient particles and residuals including organic carbon compounds, inorganics, carbonates, and black carbon. Our results show that cloud droplet residuals differ from the ambient particles in both size and composition, suggesting that both properties may impact the cloud-nucleating ability of aerosols in mixed-phase clouds. The percentage of residual particles which contained carbonates (47%) was almost four times higher than in ambient samples. Residual populations were also enhanced in sea salt and black carbon and reduced in organic compounds relative to the ambient particles. Further, our measurements suggest that chemical processing of aerosols may improve their cloud-nucleating ability. Comparison of results for various time periods within ISDAC suggests that the number and composition of cloud-nucleating particles over Alaska can be influenced by episodic events bringing aerosols from both the local vicinity and as far away as Siberia.

Print ISSN: 0148-0227

Topics: Geosciences , Physics

Published by Wiley on behalf of American Geophysical Union (AGU).

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