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Articles 1 - 11 of 11
Full-Text Articles in Biology
Influence Of Microsite Disturbance On The Establishment Of Two Congeneric Invasive Thistles, Emily S.J. Rauschert, Katriona Shea
Influence Of Microsite Disturbance On The Establishment Of Two Congeneric Invasive Thistles, Emily S.J. Rauschert, Katriona Shea
Biological, Geological, and Environmental Faculty Publications
The successful establishment of invasive species has been shown to depend on aspects of the invaded community, such as gap characteristics. Biotic resistance may be particularly critical for stopping invaders at early life history stages, but new species can often invade following disturbances, which may create microsites with very different characteristics than are usually present. We examine the response of two invasive thistle species, Carduus nutans L. and C. acanthoides L., to three different microsite characteristics: disturbance type, size, and water availability. The two species initially responded differently to the type of disturbance: C. acanthoides had higher emergence and survival …
Quantitative Evaluation Of Reciprocal Herkogamy In The Distylous Species, Hedyotis Caerulea (Rubiaceae), Dennis A. Sampson, Robert A. Krebs
Quantitative Evaluation Of Reciprocal Herkogamy In The Distylous Species, Hedyotis Caerulea (Rubiaceae), Dennis A. Sampson, Robert A. Krebs
Biological, Geological, and Environmental Faculty Publications
Hedyotis caerulea possesses two distinct floral morphs that are generally found in equal numbers in naturally occurring populations. Flowers either possess a relatively long style and short anthers, called a “pin,” or a short style and long anthers, called a “thrum.” This placement of reproductive organs is considered herkogamous and distylous, as it encourages outcrossing by restricting pollination to individuals of the alternate morph. Numerous species have been described as distylous without quantitative data establishing stigma-anther reciprocity. Here we assess those assumptions in H. caerulea by measuring stigma height, anther height and a suite of additional floral traits across multiple …
Invasional Interference Due To Similar Inter- And Intraspecific Competition Between Invaders May Affect Management, Emily S.J. Rauschert, Katriona Shea
Invasional Interference Due To Similar Inter- And Intraspecific Competition Between Invaders May Affect Management, Emily S.J. Rauschert, Katriona Shea
Biological, Geological, and Environmental Faculty Publications
As the number of biological invasions increases, the potential for invader– invader interactions also rises. The effect of multiple invaders can be superadditive (invasional meltdown), additive, or subadditive (invasional interference); which of these situations occurs has critical implications for prioritization of management efforts. Carduus nutans and C. acanthoides, two congeneric invasive weeds, have a striking, segregated distribution in central Pennsylvania, USA. Possible hypotheses for this pattern include invasion history and chance, direct competition, or negative interactions mediated by other species, such as shared pollinators. To explore the role of resource competition in generating this pattern, we conducted three related experiments …
Chemical And Isotopic Evaluation Of Sulfur Sources And Cycling In The Pecos River, New Mexico, Usa, Fasong Yuan, Bernhard Mayer
Chemical And Isotopic Evaluation Of Sulfur Sources And Cycling In The Pecos River, New Mexico, Usa, Fasong Yuan, Bernhard Mayer
Biological, Geological, and Environmental Faculty Publications
The use of stable isotopes in studies of watershed biogeochemical processes has increased greatly throughout the last several decades. Much of the sulfur cycling research has addressed the influence of changes in atmospheric acid deposition on sulfur dynamics in temperate ecosystems. Little is known about sulfur cycling in dryland ecosystems such as those in the American Southwest. To identify the sources and assess the cycling of sulfur in dryland ecosystems, chemical and isotopic compositions of water were measured on samples collected from the Pecos River (New Mexico, USA) during a reconnaissance survey in spring 2010. Based on the chemical and …
The Role Of Bcl-2 Family In Clinical Response Of Chronic Lymphocytic Leukemia, Sayer Rashed Alharbi
The Role Of Bcl-2 Family In Clinical Response Of Chronic Lymphocytic Leukemia, Sayer Rashed Alharbi
ETD Archive
The anti-apoptotic Bcl-2 proteins regulate lymphocyte survival and are over-expressed in lymphoid malignancies, including chronic lymphocytic leukemia (CLL). The small molecule inhibitor ABT-737 binds with high affinity to Bcl-2, Bcl-xl, and Bcl-w but with low affinity to Mcl-1, Bfl-1, and Bcl-b. The active analog of ABT-737, navitoclax, has shown a high therapeutic index in lymphoid malignancies developing a predictive marker for it would be clinically valuable for patient selection or choice of drug combinations. We compared expression of anti-apoptotic Bcl-2 genes that are known to be targeted by ABT-737. Our findings reveal that the relative ratio of Mcl-1 and Bfl-1 …
Study Of The L13a Residues Required For Ribosomal Function, Priyanka Das
Study Of The L13a Residues Required For Ribosomal Function, Priyanka Das
ETD Archive
Ribosome biogenesis, a fundamental process, occurs in the nucleolus. It involves incorporation and association of ribosomal proteins (r-proteins) in the ribosomal subunit. Despite its obligatory and critical role in cellular function, the explicit mechanism of incorporation of different r-proteins into the pre-ribosome is not well understood. Using mammalian cell and r-protein L13a as our model, this study addresses the function and mechanism of r-protein incorporation during ribosome maturation. Published results from our laboratory showed the requirement of the release of L13a from the 60S ribosome to silence a cohort of inflammatory proteins directly at the level of translation thus showing …
Identification Of A Post-Transcriptional Mechanism Regulating Epithelial-Mesenchymal Transition, George S. Hussey
Identification Of A Post-Transcriptional Mechanism Regulating Epithelial-Mesenchymal Transition, George S. Hussey
ETD Archive
No abstract provided.
Biofeedback-Assisted Stress Management Training To Reverse Myocardial Remodeling In Patients With End-Stage Heart Failure, Dana Lynn Schneeberger
Biofeedback-Assisted Stress Management Training To Reverse Myocardial Remodeling In Patients With End-Stage Heart Failure, Dana Lynn Schneeberger
ETD Archive
Heart failure is a progressive disease in which the heart is no longer able to pump sufficient amounts of blood to the body. Over six million Americans currently suffer from heart failure, and although pharmacological and surgical therapies continue to improve, about 50 of people with heart failure still die within five years of diagnosis.As the human heart fails, many structural, cellular and molecular alterations occur that contribute to the decrease in heart function. It has been well-established that some of these alterations are the result of sympathetic nervous system hyperactivation, and decreasing sympathetic input with a beta blocker or …
Structural Basis Of Lman1 Cargo Capture In Er & Release In Ergic, Vaijayanti Das
Structural Basis Of Lman1 Cargo Capture In Er & Release In Ergic, Vaijayanti Das
ETD Archive
No abstract provided.
Coexistence Patterns Of Two Invasive Thistle Species, Carduus Nutans And C. Acanthoides, At Three Spatial Scales, Emily S.J. Rauschert, Katriona Shea, Ottar N. Bjørnstad
Coexistence Patterns Of Two Invasive Thistle Species, Carduus Nutans And C. Acanthoides, At Three Spatial Scales, Emily S.J. Rauschert, Katriona Shea, Ottar N. Bjørnstad
Biological, Geological, and Environmental Faculty Publications
To better understand the competitive processes involved in invasion by congeners, we examine coexistence patterns of two invasive species, Carduus nutans and C. acanthoides, at three spatial scales. A roadside survey of 5 × 5 km blocks in a previously identified overlap zone provided information about the regional scale. At smaller scales, we surveyed four fields of natural co-occurrence, quantifying the spatial patterns at the field scale by randomly placed 1 × 1 m quadrats and at the smallest scale by detailing plant position within the quadrats. The patterns observed are strikingly different at the different scales. At the regional …
Mite Dna In Mantle Clips, Robert A. Krebs, Brian D. Allen, Na'tasha M. Evans
Mite Dna In Mantle Clips, Robert A. Krebs, Brian D. Allen, Na'tasha M. Evans
McNair Scholars Works
No abstract provided.