APS Practice 2013 - Revision history

Ashleyjeter at 15:18, 12 March 2013

2013-03-12T15:18:59Z

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			===Cesar Flores (Weitz Lab) [http://http://meetings.aps.org/Meeting/MAR13/Event/185809 APS Abstract: J44.00011]===
			<span id="FloresAPS2013"></span>
			<pre style="white-space:pre-wrap;">
			Session J44: Biological Networks
			4:30 PM-4:42 PM Tuesday, March 19, 2013
			Room: Holiday Ballroom 1

			Phage-bacteria infection networks: From nestedness to modularity

			Bacteriophages (viruses that infect bacteria) are the most abundant biological life-forms on Earth. However, very little is known regarding the structure of phage-bacteria infections. In a recent study we re-evaluated 38 prior studies and demonstrated that phage-bacteria infection networks tend to be statistically nested in small scale communities (Flores et al 2011). Nestedness is consistent with a hierarchy of infection and resistance within phages and bacteria, respectively. However, we predicted that at large scales, phage-bacteria infection networks should be typified by a modular structure. We evaluate and confirm this hypothesis using the most extensive study of phage-bacteria infections (Moebus and Nattkemper 1981). In this study, cross-infections were evaluated between 215 marine phages and 286 marine bacteria. We develop a novel multi-scale network analysis and find that the Moebus and Nattkemper (1981) study, is highly modular (at the whole network scale), yet also exhibits nestedness and modularity at the within-module scale. We examine the role of geography in driving these modular patterns and find evidence that phage-bacteria interactions can exhibit strong similarity despite large distances between sites.

Ashleyjeter at 14:49, 12 March 2013

2013-03-12T14:49:55Z

← Older revision		Revision as of 10:49, 12 March 2013
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	! 12:15		! 12:15
	! [[#MonaenkovaAPS2013\|Daria Monaenkova]]		! [[#MonaenkovaAPS2013\|Daria Monaenkova (Goldman Lab)]]
	\|-		\|-
	! 12:30		! 12:30
	! -		! [[#MitchellAPS2013\| Gabriel Mitchell (Weitz Group)]]
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	! 12:45		! 12:45
	! -		! [[#MclaneAPS2013\| Louis MchLane (Curtis Lab)]]
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	! 1:00		! 1:00
	! -		! [[#FloresAPS2013\| Cesar Flores (Weitz Group)]]
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	! 1:15		! 1:15
	! -		! [[#KovariAPS2013\| Daniel Kovari (Curtis Lab)]]
	\|}		\|}

DKovari: /* APS 2013 Practice Schedule */

2013-02-05T00:40:15Z

APS 2013 Practice Schedule

← Older revision		Revision as of 20:40, 4 February 2013
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	! Daria Monaenkova		! [[#MonaenkovaAPS2013\|Daria Monaenkova]]
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	! 12:30		! 12:30

DKovari: /* APS 2013 Practice Schedule */

2013-02-05T00:39:46Z

APS 2013 Practice Schedule

← Older revision		Revision as of 20:39, 4 February 2013
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	! -		! Daria Monaenkova
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	! 12:30		! 12:30

DKovari: /* Patrick Chang (Curtis Lab) APS Abstract: N45.00006 */

2013-01-25T03:00:19Z

Patrick Chang (Curtis Lab) APS Abstract: N45.00006

← Older revision		Revision as of 23:00, 24 January 2013
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	Session N45: Focus Session: Cell Mechanics I		Session N45: Focus Session: Cell Mechanics I
	12:39 PM – 12:51 PM, Wednesday, March 20, 2013		12:39 PM – 12:51 PM, Wednesday, March 20, 2013
			Hilton Baltimore Room: Holiday Ballroom 4

	Quantitative particle exclusion assays of the pericellular coat reveal changing mesh size		Quantitative particle exclusion assays of the pericellular coat reveal changing mesh size
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	===Daniel Kovari (Curtis Lab) [http://meetings.aps.org/Meeting/MAR13/Event/186419 APS Abstract: M45.00002]===		===Daniel Kovari (Curtis Lab) [http://meetings.aps.org/Meeting/MAR13/Event/186419 APS Abstract: M45.00002]===
	<span id="KovariAPS2013"></span>		<span id="KovariAPS2013"></span>

DKovari: /* Abstracts */

2013-01-25T02:56:18Z

Abstracts

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 Large underground nests protect ants from severe weather and predators. Field observations have revealed that the soil wetness affects the nest building activity. In this work we use x-ray computed tomography to study the growth of fire ants nests as a function of soil moisture content. Because capillary cohesion in wet soils leads to the competition between tunnel stability and the labor-intensity of the excavation, we expect to find an optimal soil wetness, which allows the most effective nest construction. We prepared digging containers (3.8 cm diameter by 14.5 cm deep aluminum tubes) with 2 types of simulated soil (50 and 210 um glass particles). The prepared moisture content W varied from 0.01 to 0.18 by mass. Hundred ants were allowed to dig in the containers for 20 hours. Although, the ants were able to construct tunnels in all moisture levels, the maximum tunnel depth, H, was significantly affected by W. At moderate moisture content (W$=$0.1) H was at least twice greater than at the lowest moisture content (W$=$0.01) for all tested colonies (n$=$9) for both particle sizes. The increase in H mirrors the dependence of the soil cohesion on W and we therefore conclude that the tunnel stability is a key factor influencing the digging strategy of fire ants.
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DKovari: /* Daria Monaenkova (Curtis Lab) APS Abstract: M29.00011 */

2013-01-25T02:52:17Z

Daria Monaenkova (Curtis Lab) APS Abstract: M29.00011

← Older revision		Revision as of 22:52, 24 January 2013
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	===Daria Monaenkova (~~Curtis~~ Lab) [http://meetings.aps.org/Meeting/MAR13/Event/186202 APS Abstract: M29.00011]===		===Daria Monaenkova (Goldman Lab) [http://meetings.aps.org/Meeting/MAR13/Event/186202 APS Abstract: M29.00011]===
	<span id="MonaenkovaAPS2013"></span>		<span id="MonaenkovaAPS2013"></span>
	<pre style="white-space:pre-wrap;">		<pre style="white-space:pre-wrap;">

DKovari: /* Nick Gravish (Curtis Lab) APS Abstract: W44.00009 */

2013-01-25T02:52:06Z

Nick Gravish (Curtis Lab) APS Abstract: W44.00009

← Older revision		Revision as of 22:52, 24 January 2013
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	===Nick Gravish (~~Curtis~~ Lab) [http://meetings.aps.org/Meeting/MAR13/Event/190093 APS Abstract: W44.00009]===		===Nick Gravish (Goldman Lab) [http://meetings.aps.org/Meeting/MAR13/Event/190093 APS Abstract: W44.00009]===
	<span id="GravishAPS2013"></span>		<span id="GravishAPS2013"></span>
	<pre style="white-space:pre-wrap;">		<pre style="white-space:pre-wrap;">
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	===Daria Monaenkova (Curtis Lab) [http://meetings.aps.org/Meeting/MAR13/Event/186202 APS Abstract: M29.00011]===		===Daria Monaenkova (Curtis Lab) [http://meetings.aps.org/Meeting/MAR13/Event/186202 APS Abstract: M29.00011]===
	<span id="MonaenkovaAPS2013"></span>		<span id="MonaenkovaAPS2013"></span>

DKovari: /* Abstracts */

2013-01-25T02:51:49Z

Abstracts

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 We hypothesize that ants engineer habitats which reduce locomotion control requirements. We studied tunnel construction, and locomotion, in fire ants ({\em Solenopsis invicta}, body length $L = 0.35 \pm 0.05$). In their daily life, ants forage for food above ground and return resources to the nest. This steady-state tunnel traffic enables high-throughput biomechanics studies of tunnel climbing. In a laboratory experiment we challenged fire ants to climb through 8 cm long glass tunnels (D = 0.1 - 0.9 cm) that separated a nest from an open arena with food and water. During ascending and descending climbs we induced falls by a motion-activated rapid, short, downward translation of the tunnels. Normalized tunnel diameter ($D/L$) determined the ability of ants to rapidly recover from perturbations. Fall arrest probability was unity for small $D/L$, and zero for large $D/L$. The transition from successful to unsuccessful arrest occurred at $D/L = 1.4 \pm 0.3$. Through X-Ray computed tomography study we show that the diameter of ant-excavated tunnels is independent of soil-moisture content (studied from 1-20\%) and particle size (50-595 $\mu m$ diameter), and has a mean value of $D/L = 1.06 \pm 0.23$. Thus fire ants construct tunnels of diameter near the onset of fall instability.
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DKovari: /* Abstracts */

2013-01-25T02:49:00Z

Abstracts

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 == Abstracts ==
 <span id="ChangAPS2013"></span>
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 Session N45: Focus Session: Cell Mechanics I
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 <span id="KovariAPS2013"></span>
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 Session M45: Focus Session: Physics of the Cytoskeleton I
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 Phagocytosis has traditionally been investigated in terms of the relevant biochemical signaling pathways. However, a growing number of studies investigating the physical aspects of phagocytosis have demonstrated that several distinct forces are exerted throughout particle ingestion. We use variations on FRAP (Fluorescence Recovery After Photobleaching) in combination with photo-switchable fluorescent protein to investigate actin dynamics as a phagocyte attempts to engulf its prey. The goal of our actin studies are to determine the recruitment and polymerization rate of actin in the forming phagosome and whether an organized \textit{contractile actin ring} is present and responsible for phagosome closure, as proposed in the literature. These experiments are ongoing and contribute to our long term effort of developing a physics based model of phagocytosis.
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