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2013

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Effects Of Nicotine On The Human Visual System: 1) Color Perception; 2) Processing At The Cortical Level, Naser T. Naser Jan 2013

Effects Of Nicotine On The Human Visual System: 1) Color Perception; 2) Processing At The Cortical Level, Naser T. Naser

All ETDs from UAB

The visual system is sensitive to various types of chemical substances, including nicotine. Nicotinic acetylcholine receptors (nAChRs) are found in the nervous system, including the retina. These receptors play a role in modulating signals within the visual system. It has been shown that smoking affects color vision, and visual evoked potentials (VEPs). But few studies have been devoted to understanding the effects of nicotine alone. The purpose of this research was to examine the effects of oral administration of nicotine in human adults, who are non-smokers, on color vision, and visual cortical processing. Previous studies on adult smokers revealed that …

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The Relation Of Hospital Choices In It Infrastructure Spending And Deployment With Hit/Ehr Strategies And Operational Efficiency, Harold Neumeier Jan 2013

The Relation Of Hospital Choices In It Infrastructure Spending And Deployment With Hit/Ehr Strategies And Operational Efficiency, Harold Neumeier

All ETDs from UAB

This study examined certain aspects of the association between information technology (IT) strategy and structure changes within hospitals, as well as the effects of IT infrastructure changes on measures of financial performance for these hospitals during the period of 2009-2011. Following the Process School of the Resource Based View, both internal and external information technology resources were examined to see how hospitals had responded to Federal policies related to the "meaningful use" of Health IT and Electronic Health records. Specifically, this study examined changes in information technology spending by hospitals based on size, hospital type, and percentage of revenue derived …

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Frequency Of Exercise Training's Effect On Psychological Outcomes In Older Women, William Neumeier Jan 2013

Frequency Of Exercise Training's Effect On Psychological Outcomes In Older Women, William Neumeier

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Objectives: Exercise training by older adults has demonstrated many health benefits, including improved cognition and psychological well-being. The optimal frequency of combined aerobic exercise training (AET) and resistance exercise training (RET) is unknown. The purpose of this study was to examine whether exercise improves body image, esteem, depression, and mood, among older women, and whether improvements differ by frequency of exercise. Methods: Post-menopausal women (N = 64) over the age of 60 (64.79 ± 3.74) were randomly assigned to one of three groups. Group 1 completed two exercise sessions (1 AET, 1 RET) per week, Group 2 completed four sessions …

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The Effects Of Markers For Hiv Disease Progression, Social Network, Barriers To Care, Depression, And Substance Abuse On Medical Appointment Adherence Of Hiv-Infected Adults, Yeow Chye Ng Jan 2013

The Effects Of Markers For Hiv Disease Progression, Social Network, Barriers To Care, Depression, And Substance Abuse On Medical Appointment Adherence Of Hiv-Infected Adults, Yeow Chye Ng

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The study was designed to test a causal model of theoretical relationships among markers for HIV disease progression, social network, barriers to care, depression, substance abuse, and medical appointment adherence among HIV-infected adults. The proposed causal model was derived and developed from Lazarus and Folkman's theory of stress, appraisal, and coping. The knowledge gained from this study may yield critical information with respect to determining how a health care provider or researcher can develop specific behavioral interventions for the improvement of medical appointment adherence among HIV-infected adults living in the Southeastern United States. The correlational study was a secondary analysis …

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Detecting Deceptive Chat-Based Communication Using Typing Behavior And Message Cues, Douglas C. Derrick, Thomas O. Meservy, Jeffrey L. Jenkins, Judee K. Burgoon, Jay F. Nunamaker Jr. Jan 2013

Detecting Deceptive Chat-Based Communication Using Typing Behavior And Message Cues, Douglas C. Derrick, Thomas O. Meservy, Jeffrey L. Jenkins, Judee K. Burgoon, Jay F. Nunamaker Jr.

Faculty Publications

Computer-mediated deception is prevalent and may have serious consequences for individuals, organizations, and society. This article investigates several metrics as predictors of deception in synchronous chatbased environments, where participants must often spontaneously formulate deceptive responses. Based on cognitive load theory, we hypothesize that deception influences response time, word count, lexical diversity, and the number of times a chat message is edited. Using a custom chatbot to conduct interviews in an experiment, we collected 1,572 deceitful and 1,590 truthful chat-based responses. The results of the experiment confirm that deception is positively correlated with response time and the number of edits and …

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An Investigation Of The Sublethal Effects Of Carbon Dioxide On The Common Sea Urchin Lytechinus Variegatus And The Carbonate Chemistry Of Its Nearshore Habitat, Roberta Challener Jan 2013

An Investigation Of The Sublethal Effects Of Carbon Dioxide On The Common Sea Urchin Lytechinus Variegatus And The Carbonate Chemistry Of Its Nearshore Habitat, Roberta Challener

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Increases in CO2 concentrations, whether from accumulation of metabolic waste under intensive culturing conditions or from increases in atmospheric levels, lead to decreases in seawater pH and carbonate saturation states. Lytechinus variegatus survive chronic exposure to hypercapnic conditions (pH 7.4 -7.8, partial pressure of CO2 (pCO2) 1738-4290 μatm) in synthetic seawater, yet aspects of growth and development are affected. Rates of embryonic and larval development were delayed and larval size and arm length reduced under high pCO2 conditions. Fecal production rates were higher and ash absorption efficiency (%) was lower in individuals exposed to hypercapnic conditions, suggesting that the ability …

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Identification Of Claudin-1 As An Entry Factor In Dengue Infection And Development Of A High Throughput Screening Assay For Antivirals Against Dengue Virus, Pulin Che Jan 2013

Identification Of Claudin-1 As An Entry Factor In Dengue Infection And Development Of A High Throughput Screening Assay For Antivirals Against Dengue Virus, Pulin Che

All ETDs from UAB

Dengue virus (DENV) has become a huge public health concern around the world with no vaccine or antivirals available. More than one-third of the world's population is living in areas at risk of infection. To conquer the dengue disease, a better understanding of virus-host interactions and development of the appropriate therapeutic treatments are required. In this dissertation, we first broadly reviewed the factors involved in dengue viral entry and the role of tight junctions as a pathogen target. Second, we developed, optimized and validated a high throughput screening (HTS) assay for anti-dengue virus drug screening. Taking advantage of using live …

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Identification Of Staphylococcus Aureus Sortase A Inhibitors As Potential Antibacterial Agents, Bala Chandra Chenna Jan 2013

Identification Of Staphylococcus Aureus Sortase A Inhibitors As Potential Antibacterial Agents, Bala Chandra Chenna

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Staphylococcus aureus (S. aureus) is the causative organism for a wide range of infectious diseases from superficial skin infections to dangerous bacteremias. Six pathogens named ESKAPE pathogens are responsible for majority of antibiotic resistant bacterial infections. MRSA is the single most prevalent ESKAPE pathogen. Many of the nosocomial MRSA strains are multi-drug resistant, and even methicillin-sensitive strains can be deadly. S. aureus has recently taken on a new role in causing an escalating number of community-acquired infections in non-hospitalized persons without predisposing risk factors. Due to the increase in the number of infections caused by multi-drug resistant S. aureus and …

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Comparisons Between Electrophysiologic Assessments Of Visual Function And Histological Findings Of Cone Photoreceptors In Light-Damaged Albino Rats, Molly Clark Jan 2013

Comparisons Between Electrophysiologic Assessments Of Visual Function And Histological Findings Of Cone Photoreceptors In Light-Damaged Albino Rats, Molly Clark

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The purpose of this project was to investigate the etiology of decreased cone-driven vision in the light damage model of retinal degenerations. Experimental albino rats underwent moderate, low-intensity light damage for 10 days. Electroretinography was utilized to assess physiologic function of the rod- and cone-driven retinal function in the experimental and control (sibling) rats. Immunohistochemical staining for cone arrestin antibody identified cone photoreceptors, allowing quantification of cone density and comparison to the decline in functional vision. In this experiment the light-damaged rats showed decreased rod- and cone-driven function with partial recovery of responses 30 days later. Outer nuclear layer thickness …

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Structure-Function Analysis Of Tyrosyl-Dna Phosphodiesterase I, Evan Comeaux Jan 2013

Structure-Function Analysis Of Tyrosyl-Dna Phosphodiesterase I, Evan Comeaux

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Tyrosyl-DNA phosphodiesterase I (Tdp1) functions to remove 3'phospho-DNA adducts, such as eukaryotic DNA Topoisomerase I (Top1) covalently bound to the DNA by a 3'phospho-tyrosyl bond. As member of the Phospholipase D superfamily Tdp1 contains two HxK(n)N motifs, each of which provide a catalytic histidine: one functioning as a nucleophile to bind the 3'phosphate and the other as a general acid/base to hydrolyze Tdp1's 3'phospho-histidyl bond. Mutation of the general acid/base catalytic histidine (Hisgab) to arginine has been implicated in the autosomal recessive neurodegenerative disease SCAN1. Further study of the yeast enzyme revealed that substitution of Hisgab in yeast Tdp1 to …

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Comparison Of Fabricated Carbon Nanotube Sorbent Felts And 3m Charcoal Sorbent Wafers To Assess Passive Sampling, Samantha Connell Jan 2013

Comparison Of Fabricated Carbon Nanotube Sorbent Felts And 3m Charcoal Sorbent Wafers To Assess Passive Sampling, Samantha Connell

All ETDs from UAB

Passive air sampling is the preferred method of air sampling for many applications. Traditionally, this method uses activated charcoal as the sorbent and samples are analyzed by chemical or thermal desorption. This research explores the use of carbon nanotubes in the form of a felt as a sorbent for passive sampling by comparing the mass uptake and percent yield to that of the 3MTM Organic Vapor Monitor (OVM) 3500 over four time trials. The desorption efficiency, adsorption capacity, and mass uptake of the fabricated felts are very similar to the 3MTM OVM 3500. It was expected that the fabricated felts …

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Understanding The Function And Regulation Of Eukaryotic Release Factor 1, Erf1, Sara Elisabeth Conard Jan 2013

Understanding The Function And Regulation Of Eukaryotic Release Factor 1, Erf1, Sara Elisabeth Conard

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Translation termination is an essential eukaryotic process that facilitates the end of protein synthesis and mediates the release of the nascent peptide chain. Two release factors, eRF1 and eRF3, with the help of a ribosome recycling factor assist in this process. eRF1 and eRF3 form a stable complex through conserved regions in their C-terminal domains. The eRF1/eRF3 complex, along with GTP, is absolutely vital for efficient termination in vitro and in vivo. The role of eRF1 during translation termination is to recognize the stop codon located in the ribosome aminoacyl site, stimulate GTP hydrolysis of eRF3 and enable peptide release …

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Tgf-Ss And Erg In Intervertebral Disc Development, Megan Karen Cox Jan 2013

Tgf-Ss And Erg In Intervertebral Disc Development, Megan Karen Cox

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The intervertebral disc (IVD) is a fibrocartilaginous tissue that acts as a shock absorber between adjacent vertebrae in the spinal column. It is comprised of two parts, the inner jelly-like nucleus pulposus (NP) and the outer more fibrous annulus fibrosus (AF). Most IVD research has focused on the development of the NP, which is derived from condensations of the notochord involving sonic hedgehog (Shh) signaling. In contrast, very little is known about the molecular mechanisms underlying the specific development of the AF of the IVD. The AF is derived from the sclerotome, which is formed by the ventral half of …

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Selection And Evolution Of Pneumococci In Response To Conjugate Vaccines, Christina M. Croney Jan 2013

Selection And Evolution Of Pneumococci In Response To Conjugate Vaccines, Christina M. Croney

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Pneumococcal conjugate vaccines (PCVs) containing subsets of the >90 capsular polysaccharide antigens have been successful as a means of decreasing invasive and non-invasive pneumococcal disease worldwide. However, this success is limited to the specif-ic capsular serotypes against which PCVs are formulated and studies have reported the increase of nonvaccine serotypes. The 13-valent pneumococcal conjugate vaccine (PCV13) was introduced in the United States in 2010 for the prevention of invasive pneumococcal disease (IPD) and otitis media and was released without efficacy data. In this study we set out to 1) determine potential efficacy for invasive and noninvasive pneumococcal disease and 2) …

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Utilizing A Hydroxyapatite-Binding Domain To Deliver Bone Regenerative Molecules To Hydroxyapatite And Allograft Bone To Enhance Osteogenesis, Bonnie Kathleen Culpepper Jan 2013

Utilizing A Hydroxyapatite-Binding Domain To Deliver Bone Regenerative Molecules To Hydroxyapatite And Allograft Bone To Enhance Osteogenesis, Bonnie Kathleen Culpepper

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Hydroxyapatite (HA) makes up the mineral component of bone, and synthetic HA is commonly used to coat metal implants for use in dentistry and orthopedics. Additionally, allograft and synthetic HA are common alternatives to autograft bone, to circumvent the complications associated with a second surgery site. While both HA and allograft are known to be osteoconductive, osteoinductivity is limited. In this work, we developed methods for anchoring osteoinductive factors onto multiple types of HA biomaterials and human allograft bone, with the goal of enhancing their osteoregenerative potential. Specifically, a HA-binding domain, heptaglutamate (E7), modeled on bone-binding domains within native proteins, …

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An Investigation Of Trem-Like Transcript 2 Expression, Kimberly Anne Thomas Jan 2013

An Investigation Of Trem-Like Transcript 2 Expression, Kimberly Anne Thomas

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Acute inflammation is a necessary component for the clearance of pathogens. Cells at the site of infection utilize highly conserved receptors to both recognize microbes and induce the production of pro-inflammatory stimuli. These stimuli set off a chain reaction that includes localized vasodilation, leukocyte infiltration, and tissue destruction, collectively known as inflammation. Tightly controlled, this process is protective, and can compartmentalize the damage to a defined area, but when dysregulated can be catastrophic, inducing chronic inflammation and even death. Families of innate receptors can modulate inflammatory processes, and in doing so, increase or decrease their severity, as well as tailor …

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Influence Of Implant Angulation On The Fracture Resistance Of Zirconia Abutments, Shreedevi Thulasidas Jan 2013

Influence Of Implant Angulation On The Fracture Resistance Of Zirconia Abutments, Shreedevi Thulasidas

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Zirconia-based implant abutments are widely used in prosthetic dentistry. Custom made abutments are utilized to correct for non-ideal implant positions and can successfully accommodate the morphologic requirements of the overlying crown. It was hypothesized that there will be difference in fracture strength and fracture mode of artificially aged zirconia implant abutments supported by implants at varying angulation, when load is applied to failure on overlying zirconia crowns. The implant-abutment-crown assemblies were subjected to steam autoclaving to induce some degree of phase transformation from tetragonal to weaker monoclinic form and to thermo-cycling to artificially age the samples. The effects of loading …

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Neutropenia And Progenitor Cell Mobilization In Ap3-B1 Mutant Pearl Mice, Matthew Vallejo Jan 2013

Neutropenia And Progenitor Cell Mobilization In Ap3-B1 Mutant Pearl Mice, Matthew Vallejo

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Mutations in the AP3-ß1 gene are known to cause Hermansky-Pudlak syndrome type 2 (HPS2) in humans and canine cyclic hematopoiesis (CH) in gray collie dogs. HPS2 patients have severe congenital neutropenia (SCN), and dogs have cyclic neutropenia (CN). The mechanism behind neutropenia is uncertain. Pearl mice have an AP3-ß1 mutation, but whether they actually have neutropenia has not yet been evaluated. This dissertation presents a discussion of the evaluation of neutropenia in pearl mice, hematopoietic progenitor cell mobilization defect in pearl mice and finally an evaluation of methods of dog-to-mouse xenotransplantation to establish a xenotransplant model of the dog hematopoietic …

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Intrinsic Properties Of Rna Polymerase I And Trans-Acting Factors Control Transcription Elongation Efficiency, Olga V. Viktorovskaya Jan 2013

Intrinsic Properties Of Rna Polymerase I And Trans-Acting Factors Control Transcription Elongation Efficiency, Olga V. Viktorovskaya

All ETDs from UAB

Transcription of ribosomal (r) DNA by RNA polymerase I (Pol I) is the initial step of ribosome synthesis. Pol I transcription is unique in its high rate of initiation, specific organization within the nucleolus and tight connection to cell growth and proliferation. Moreover, transcription elongation by Pol I is functionally coupled with rRNA processing and assembly of the ribosomes. Regulatory insights into transcription elongation by Pol I and its interface with rRNA processing are limited, despite decades of research. To fulfill that gap, we asked several important questions: Do the obvious functional divergences between Pol I and other eukaryotic polymerases …

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Association Between Cruciferous Vegetable Intake And Risk Of Colorectal Cancer Among Men In Shanghai, China, Emily Vogtmann Jan 2013

Association Between Cruciferous Vegetable Intake And Risk Of Colorectal Cancer Among Men In Shanghai, China, Emily Vogtmann

All ETDs from UAB

Colorectal cancer (CRC) is a major global health concern and the intake of certain foods, such as cruciferous vegetables, has been studied for their potential protective effects against cancer development. The observed association between cruciferous vegetable consumption and CRC has been inconsistent, possibly related to glutathione S-transferase (GST) gene polymorphisms. Therefore, we aimed to (1) evaluate the association between fruits and vegetables, including cruciferous vegetables, on the risk of CRC; (2) determine factors associated with urinary isothiocyanate (ITC), a biomarker of cruciferous vegetable intake; and (3) evaluate the association between cruciferous vegetable consumption and CRC and to estimate the potential …

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Age Cohorts And Emotional Attachment To Mobile Phones, Amanda Warr Jan 2013

Age Cohorts And Emotional Attachment To Mobile Phones, Amanda Warr

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ABSTRACT Mobile phones have become integral to the way people communicate. Although mobile phone ownership is nearing saturation in the United States, use patterns differ among age cohorts. Another difference is the degree to which members of different age cohorts depend on their mobile phones. I explore emotional attachment to mobile phones and how it differs by age cohorts. Using data from a national survey of U.S. adults, I examine whether cohorts differ in attachment to their mobile phones, even when controlling for diversity of technology use. The results illustrate that there are important differences in attachment to mobile phones …

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Glioma-Vasculature Interactions, Stacey Watkins Jan 2013

Glioma-Vasculature Interactions, Stacey Watkins

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Malignant gliomas are highly invasive brain tumors, which lack effective treatment options. To date, the standard therapy includes surgical debulking followed by chemotherapy and radiation. Despite efforts to eradicate the disease, the median patient survival time is only 14 months. In an attempt to discover novel therapies, research has focused on understanding the heterogeneous biological mechanisms employed by these cells. Uniquely, they do not metastasize through the vasculature or lymphatics like other solid cancers but alternatively, glioma cells utilize the abluminal surface of the vasculature to guide invasion and migration throughout the brain. The intimate association between glioma cells and …

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Effect Of A Faith-Based Initiative On Hospital Readmissions, Joseph Webb Jan 2013

Effect Of A Faith-Based Initiative On Hospital Readmissions, Joseph Webb

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EFFECT OF A FAITH-BASED INITIATIVE ON HOSPITAL READMISSIONS JOSEPH WEBB ADMINISTRATION-HEALTH SERVICES ABSTRACT The purpose of this study was to examine the relationship between a faith-based initiative and hospital readmissions. The main data source used was the inpatient data-base of Methodist LeBonheur Healthcare System (MLH) in Memphis, TN. Data were collected from admissions that occurred during years 2008 through 2012 at four of MLH's five adult acute-care hospitals. Data from the U.S. Census Bureau's American Community Survey were also used in the study. This study uses theoretical tenets from the Social Justice and Equity Theory and the Chronic Care Model …

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Hur Regulation In Central Nervous System Disorders, Crystal G. Wheeler Jan 2013

Hur Regulation In Central Nervous System Disorders, Crystal G. Wheeler

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In inflammatory diseases of the central nervous system (CNS), astrocytes play a major role in the systemic response to disease by either enhancing or limiting the inflammatory response through secretion of growth factors or cytokines. HuR RNA binding protein regulates many genes involved in inflammation. Inflammatory diseases such as brain tumors, Amylotrophic Lateral Sclerosis (ALS), and Multiple Sclerosis (MS), have been linked to HuR, by our laboratory and others. To determine whether astrocytic overexpression of HuR would regulate inflammation in diseases of the CNS, we designed a transgenic mouse in which the HuR gene is overexpressed. In the first study, …

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Impulsivity As A Predictor Of Smoking Cessation Outcomes In Bupropion Treatment Of Community Corrections Smokers, Adam Clay Perkins Jan 2013

Impulsivity As A Predictor Of Smoking Cessation Outcomes In Bupropion Treatment Of Community Corrections Smokers, Adam Clay Perkins

All ETDs from UAB

Cigarette smoking is the leading cause of death and disability in the United States. Prevalence of smoking among participants in community corrections far exceeds those in the general population. The purpose of the study was to examine predictors of smoking cessation outcome among community correction participants who were enrolled in a randomized control trial that used bupropion to treat tobacco dependence. This study found that inattention was a significant barrier to treatment. Specifically, performance on measures of attention including number of omissions errors on the Conner's Continuous Performance Task - Second Edition (CPT-II) and time to complete Trails A were …

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Insulin Resistance, Lipids, And The Metabolic Syndrome Trait Cluster: Impact Of Race And Very Low Calorie Diet, Veeradej Pisprasert Jan 2013

Insulin Resistance, Lipids, And The Metabolic Syndrome Trait Cluster: Impact Of Race And Very Low Calorie Diet, Veeradej Pisprasert

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Insulin resistance (IR) is central to the pathogenesis of cardiometabolic disorders. Early detection, along with appropriate interventions, is paramount to reduce the morbidity and mortality of IR-related diseases. The gold standard measurement for IR is the hyperinsulinemic-euglycemic clamp, which is markedly sophisticated for clinical evaluation but costly and invasive for clinical practice. Several alternative surrogate indicators of IR have been identified and used by clinicians, including insulin sensitivity indices derived from plasma glucose and insulin values, as well as other indicators that are independent of direct insulin measurements. In addition, lipid panel and lipoprotein subclass profile have emerged as markers …

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Epigenetic Regulation Of Hippocampus-Dependent Learning, Laura Qadri Jan 2013

Epigenetic Regulation Of Hippocampus-Dependent Learning, Laura Qadri

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Knowledge of the molecular mechanisms that underlie learning and memory has advanced a great deal. Research into the role of epigenetics, or modifications above the genome, has the promise of providing an even greater understanding of the precise mechanisms involved in memory formation. Studies of epigenetic regulation of memory in the rodent hippocampus have primarily focused on associative learning using contextual fear conditioning. While these studies have provided valuable insight into the role that epigenetics plays in cognition, it remains to be seen whether the findings generalize to other forms of hippocampus-dependent learning. This work examines the role of epigenetic …

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Socioeconomic Predictors Of 30-Day Readmission Of Elderly Patients With Initial Discharge Destination Of Home Health Care, Dianne Marrie Richmond Jan 2013

Socioeconomic Predictors Of 30-Day Readmission Of Elderly Patients With Initial Discharge Destination Of Home Health Care, Dianne Marrie Richmond

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Introduction The purpose of this study was to examine the association of social determinants of health with 30-day rehospitalization among elderly patients who were discharged from an acute care hospital with an initial discharge destination of home with home health care support and to explore the social determinants' ability to accurately predict the odds of rehospitalization. Methods A secondary data analysis was performed on data obtained from the home healthcare agency. A total of 4,717 unique patients found in the data set. Some patients were represented in the data more than once during the observation period. To examine the relationship …

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A Phenomenological Study Of The Lived Experiences Of African American Female School Leaders In Suburban School Districts, Armentress Denise Robinson Jan 2013

A Phenomenological Study Of The Lived Experiences Of African American Female School Leaders In Suburban School Districts, Armentress Denise Robinson

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Abstract The purpose of this phenomenological study was to explore and gain an in-depth understanding of the personal, professional, and sociocultural experiences of African American female school leaders in suburban school districts. These school districts were identified as suburban locations because of low to no student poverty, stellar performances on standardized tests, high graduation and college going rates, and champion academic and athletic team honors. This qualitative study employed a phenomenological design to allow the researcher the opportunity to investigate and gather data through open-ended, face-to-face, one hour interviews with study participants. Three theoretical frameworks--critical race theory, racial identity development …

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Studies Of Dna Gyrase Activity In Escherichia Coli And Salmonella Enterica Serovar Typhimurium., Nikolay Sergeyevich Rovinskiy Jan 2013

Studies Of Dna Gyrase Activity In Escherichia Coli And Salmonella Enterica Serovar Typhimurium., Nikolay Sergeyevich Rovinskiy

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Gyrase introduces negative supercoils into bacterial DNA. In balance with topoisomerase I, it contributes to the maintenance of constant negative DNA supercoiling. It was shown that in Escherichia coli negative supercoil density of pBR322 plasmid is higher than in Salmonella typhimurium. One of the possible explanations of this phenomenon is a difference of DNA gyrase activity between E. coli and S. typhimurium. We developed in vitro assay of gyrase activity which has shown that DNA gyrases of E. coli and S. typhimurium have the same supercoiling end point, but E. coli gyrase works slightly faster than the S. typhimurium enzyme. …

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