Search Results - "Siefert, Andrew"

Incorporating intraspecific variation in tests of trait-based community assembly by Siefert, Andrew

“…Environmental filtering and niche differentiation are processes proposed to drive community assembly, generating nonrandom patterns in community trait…”
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Intraspecific trait variation and the leaf economics spectrum across resource gradients and levels of organization by Fajardo, Alex, Siefert, Andrew

“…Understanding patterns of functional trait variation across environmental gradients offers an opportunity to increase inference in the mechanistic causes of…”
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Phenological variation of leaf functional traits within species by Fajardo, Alex, Siefert, Andrew

“…A basic assumption of the trait-based approach in plant ecology is that differences in functional trait values are greater between species than within species…”
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Spatial patterns of functional divergence in old-field plant communities by Siefert, Andrew

“…Spatial patterns of functional traits have received little attention in community ecology but have the potential to provide insights into the processes that…”
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A global method for calculating plant CSR ecological strategies applied across biomes world-wide by Pierce, Simon, Negreiros, Daniel, Cerabolini, Bruno E. L., Kattge, Jens, Díaz, Sandra, Kleyer, Michael, Shipley, Bill, Wright, Stuart Joseph, Soudzilovskaia, Nadejda A., Onipchenko, Vladimir G., van Bodegom, Peter M., Frenette-Dussault, Cedric, Weiher, Evan, Pinho, Bruno X., Cornelissen, Johannes H. C., Grime, John Philip, Thompson, Ken, Hunt, Roderick, Wilson, Peter J., Buffa, Gabriella, Nyakunga, Oliver C., Reich, Peter B., Caccianiga, Marco, Mangili, Federico, Ceriani, Roberta M., Luzzaro, Alessandra, Brusa, Guido, Siefert, Andrew, Barbosa, Newton P. U., Chapin, Francis Stuart, Cornwell, William K., Fang, Jingyun, Fernandes, Geraldo Wilson, Garnier, Eric, Le Stradic, Soizig, Peñuelas, Josep, Melo, Felipe P. L., Slaviero, Antonio, Tabarelli, Marcelo, Tampucci, Duccio

“…Summary Competitor, stress‐tolerator, ruderal (CSR) theory is a prominent plant functional strategy scheme previously applied to local floras. Globally, the…”
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Estimating the net effect of functional traits on fitness across species and environments by Siefert, Andrew, Laughlin, Daniel C.

“…Functional traits affect the demographic performance of individuals in their environment, leading to fitness differences that scale up to drive population…”
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How Local Annular Force and Collagen Density Govern Mitral Annuloplasty Ring Dehiscence Risk by Pierce, Eric L., BS, Siefert, Andrew W., PhD, Paul, Deborah M., BS, Wells, Sarah K., BS, Bloodworth, Charles H., BS, Takebayashi, Satoshi, MD, Aoki, Chikashi, MD, Jensen, Morten O., PhD, Dr.Med, Gillespie, Matthew J., MD, Gorman, Robert C., MD, Gorman, Joseph H., MD, Yoganathan, Ajit P., PhD

“…Background Annuloplasty ring dehiscence is a well described mode of mitral valve repair failure. Defining the mechanisms underlying dehiscence may facilitate…”
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An experimental test of stabilizing forces in the field niche by Siefert, Andrew, Friesen, Maren L., Zillig, Kenneth W., Aguilar, Jessica, Strauss, Sharon Y.

“…Modern coexistence theory holds that stabilizing mechanisms, whereby species limit the growth of conspecifics more than that of other species, are necessary…”
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Mitral valve annuloplasty and anterior leaflet augmentation for functional ischemic mitral regurgitation: Quantitative comparison of coaptation and subvalvular tethering by Rabbah, Jean-Pierre M., PhD, Siefert, Andrew W., PhD, Bolling, Steven F., MD, Yoganathan, Ajit P., PhD

“…Objective Although restrictive mitral annuloplasty (RMA) has been the preferred surgical treatment of functional ischemic mitral regurgitation (FIMR), some…”
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Mitral Annuloplasty Ring Suture Forces: Impact of Surgeon, Ring, and Use Conditions by Pierce, Eric L., BS, Bloodworth, Charles H., BS, Siefert, Andrew W., PhD, Easley, Thomas F., MS, Takayama, Tetsushi, MD, Kawamura, Tomonori, MD, Gorman, Robert C., MD, Gorman, Joseph H., MD, Yoganathan, Ajit P., PhD

“…Abstract Objective – To quantify the effect of ring type, ring-annulus sizing, suture position, and surgeon on the forces required to tie-down and constrain a…”
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Community functional responses to soil and climate at multiple spatial scales: when does intraspecific variation matter? by Siefert, Andrew, Fridley, Jason D, Ritchie, Mark E

“…Despite increasing evidence of the importance of intraspecific trait variation in plant communities, its role in community trait responses to environmental…”
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Scale dependence of vegetation-environment relationships: a meta-analysis of multivariate data by Siefert, Andrew, Ravenscroft, Catherine, Althoff, David, Alvarez-Yépiz, Juan C., Carter, Benjamin E., Glennon, Kelsey L., Heberling, J. Mason, Jo, In Su, Pontes, Alyssa, Sauer, Amy, Willis, Adam, Fridley, Jason D.

“…Questions: How does spatial scale (extent and grain) influence the relative importance of different environmental factors as determinants of plant community…”
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Real-time recording of annuloplasty suture dehiscence reveals a potential mechanism for dehiscence cascade by Pierce, Eric L., BS, Gentile, Javier, MD, Siefert, Andrew W., PhD, Gorman, Robert C., MD, Gorman, Joseph H., MD, Yoganathan, Ajit P., PhD

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Suture Forces in Undersized Mitral Annuloplasty: Novel Device and Measurements by Siefert, Andrew W., MS, Pierce, Eric L., BS, Lee, Madonna, MD, Jensen, Morten Ø., PhD, Aoki, Chikashi, MD, Takebayashi, Satoshi, MD, Fernandez Esmerats, Joan, MS, Gorman, Robert C., MD, Gorman, Joseph H., MD, Yoganathan, Ajit P., PhD

“…Purpose To demonstrate the first use of a novel technology for quantifying suture forces on annuloplasty rings to better understand the mechanisms of ring…”
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Mechanics of healthy and functionally diseased mitral valves: a critical review by Rabbah, Jean-Pierre M, Saikrishnan, Neelakantan, Siefert, Andrew W, Santhanakrishnan, Arvind, Yoganathan, Ajit P

“…The mitral valve is a complex apparatus with multiple constituents that work cohesively to ensure unidirectional flow between the left atrium and ventricle…”
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In Vitro Mitral Valve Simulator Mimics Systolic Valvular Function of Chronic Ischemic Mitral Regurgitation Ovine Model by Siefert, Andrew W., MS, Rabbah, Jean Pierre M., BS, Koomalsingh, Kevin J., MD, Touchton, Steven A., BS, Saikrishnan, Neelakantan, PhD, McGarvey, Jeremy R., MD, Gorman, Robert C., MD, Gorman, Joseph H., MD, Yoganathan, Ajit P., PhD

“…Background This study was undertaken to evaluate an in vitro mitral valve (MV) simulator's ability to mimic the systolic leaflet coaptation, regurgitation, and…”
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Tricuspid Valve Annular Mechanics: Interactions with and Implications for Transcatheter Devices by Singh-Gryzbon, Shelly, Siefert, Andrew W., Pierce, Eric L., Yoganathan, Ajit P.

“…In the interventional treatment of tricuspid valve regurgitation, the majority of prosthetic devices interact with or are implanted to the tricuspid valve…”
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Transcatheter aortic valve implantation can potentially impact short-term and long-term functionality: An in vitro study by Stearns, Grant, Saikrishnan, Neelakantan, Siefert, Andrew W, Yoganathan, Ajit P

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Mitral valve annular downsizing forces: Implications for annuloplasty device development by Jensen, Morten O., PhD, Honge, Jesper L., MD, PhD, Benediktsson, Jon A., MS, Siefert, Andrew W., MS, Jensen, Henrik, MD, PhD, Yoganathan, Ajit P., PhD, Snow, Teresa K., PhD, Hasenkam, J. Michael, MD, PhD, DMSc, Nygaard, Hans, DMSc, Nielsen, Sten L., MD, PhD, DMSc

“…Objective Mitral valve repair with annulus downsizing is a popular surgical procedure for functional mitral regurgitation. We investigated the effects of…”
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Right Heart Morphology of Candidate Patients for Transcatheter Tricuspid Valve Interventions by Khalique, Omar K., Jelnin, Vladimir, Hueske, Andreas, Lawlor, Mathew, Leon, Martin B., Kodali, Susheel K., Akkoc, Deniz, Pettway, Eriq, Hahn, Rebecca T., Hamid, Nadira B., George, Isaac, Patel, Amisha, Ng, Vivian, Vahl, Torsten P., Nazif, Tamim M., Siefert, Andrew W.

“…Purpose This study quantitatively evaluated the phasic right heart morphology of candidate patients for a transcatheter tricuspid valve intervention (N=32) and…”
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