Now showing items 2896-2915 of 8867

• #### Evolutionary conflict in chimeras of the social amoeba, Dictyostelium discoideum ﻿

(2002)
Molecular biologists have extensively studied Dictyostelium discoideum and consider it a model organism for the study of cellular differentiation but paradoxically many aspects of the natural life and evolution of this ...
• #### Evolutionary costs and benefits of a newly discovered symbiosis between the social amoeba Dictyostelium and bacteria ﻿

(2012)
Recent work has shown that microorganisms are surprisingly like animals in having sophisticated behaviours such as cooperation, communication, and recognition, as well as many kinds of symbioses. Here we show first that ...
• #### Evolutionary fates within a microbial population highlight an essential role for protein folding during natural selection ﻿

(2012)
The fitness function developed in this thesis directly links the physicochemical properties of an enzyme to evolutionary fates in a quantitative and predictive manner through a comparative study of empirical and simulated ...
• #### Evolutionary Genetics of Dictyostelids: Cryptic Species, Sociality and Sex ﻿

(2011)
Dictyostelium discoideum serves as an ideal system to study social evolution because of the social stage of its lifecycle, where individuals aggregate to build a multicellular structure. However, much of its basic biology ...
• #### Evolutionary responses to global change: an experimental test of the effect of altered precipitation on hybridization rates in sunflower (Helianthus) ﻿

(2013-07-24)
Climate change is rapidly altering natural ecosystems. Plastic and adaptive responses to climate change (i.e., range shifts and phenology) have been widely noted across taxa. However, the effects of climate change on ...
• #### Evolutionary Trajectories to Daptomycin Resistance in Enterococcus faecalis ﻿

(2013-11-18)
With increasing amounts of hospital-acquired antibiotic resistant infections each year and staggering healthcare costs, there is a clear need for new antimicrobial agents, as well as novel strategies to extend their clinical ...
• #### Exact and inexact Newton linesearch interior-point algorithms for nonlinear programming problems ﻿

(1997)
In the first part of this research we consider a linesearch globalization of the local primal-dual interior-point Newton's method for nonlinear programming recently introduced by El-Bakry, Tapia, Tsuchiya, and Zhang. Our ...
• #### Examination of a system for the mechanistic study of tumor cell-platelet interactions under well-defined flow conditions ﻿

(2000)
The compelling evidence that platelets play a contributory role in hematogenous metastasis raises a need to elucidate the molecular mechanisms by which tumor cells activate and adhere to platelets. To model the in vivo ...
• #### Examination of additively colored alkali halides for photoelectric Hall effect ﻿

(1939)
Abstract Not Available.
• #### EXAMINATION OF SUBUNIT INTERACTIONS IN THE LACTOSE REPRESSOR BY PHYSICAL AND CHEMICAL METHODS (CYSTEINE, METHYL METHANETHIOSULFONATE, QUATERNARY STRUCTURE, ALLOSTERISM, MONOMER) ﻿

(1985)
The lactose repressor was modified with three sulfhydryl specific reagents which form mixed disulfide adducts. Methyl methanethiosulfonate (MMTS) and 5,5'-dithiobis(nitrobenzoic acid) (DTNB) completely reacted with all ...
• #### Examination of the C-terminal assembly motif in lactose repressor ﻿

(1999)
Assembly requirements for lactose repressor protein have been examined by substitutions in the leucine heptad repeat (LHR) tetramerization domain. All a and d positions of the LHR were substituted with Ile (II) or a positions ...
• #### EXAMINATION OF THE INTERACTION OF INDUCER WITH THE LACTOSE REPRESSOR PROTEIN ﻿

(1987)
The lactose repressor protein from the mutant E. coli BG185 contains valine at position 81 instead of alanine (Adler et al., 1972; Muller-Hill et al., 1975). The BG185 protein exhibits properties similar to the wild-type ...
• #### Examination of the relative importance of the dimensions of applicants' work experience: A policy-capturing approach ﻿

(1999)
This study examines whether raters are sensitive to differences among job applicants on multiple dimensions of work experience. A policy-capturing approach was employed to investigate the relative importance of applicant ...
• #### Examining competitive interaction between Rasberry crazy ants (Paratrechina sp.nr. pubens) and red imported fire ants (Solenopsis invicta) using laboratory and field studies ﻿

(2010)
Studying nonnative species soon after their introduction is critical to understanding their risk of becoming widely invasive and determining effective methods of control. I conducted laboratory and field experiments on the ...
• #### Examining the Use of Homology Models in Predicting Kinase Binding Affinity ﻿

(2013-12-05)
Drug design is a difficult and multi-faceted problem that has led to extensive interdiscplinary work in the field of computational biology. In recent years, several computational methods have emerged. The overall goal of ...
• #### Excavated Sanctuaries (Subtracting Ground By Program) ﻿

(2015-04-09)
This thesis focuses on subtraction not addition, subtracting voids and spatial volumes according to users’ need of functions, circulation and natural light. These voids will be excavated in the natural ground in order to ...
• #### Exchange in the barranco: Organizing the internal economy ﻿

(2010)
This thesis problematizes the infrastructural and social boundaries of informal settlements established in anomalous depressed tissues within the gridded city. It does so by proposing a new urban strategy that intends to ...
• #### Exchange-rate-based stabilization syndrome: Credible disinflation, capital inflows, and the domestic banking system ﻿

(1998)
Interactions between the banking sector and an open capital account are investigated as rationalizations for the empirical regularities that characterize disinflation programs anchored by fixing the exchange rate. Financial ...
• #### Excimer laser induced electrical conductivity and nanostructures in polymers ﻿

(1993)
The generation of substantial electrical conductivity in high temperature polymers and thin film C$\sb{60}$ by means of KrF (248 nm) excimer laser irradiation has been investigated. Formation of both laser ablated surface ...
• #### Excimer laser induced electrical conductivity in polyimide: Applications to engineering, physics, and applied science ﻿

(1996)
Various aspects of the interaction of excimer laser pulses and polyimide were investigated, focusing on low fluences where laser induced electrical conductivity is observed. Multiple shot excimer ablation of polyimide was ...