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- Creator:
- Malhas, Dana
- Description:
- The purpose of this study is to identify the relationship between caffeine ingestion and its effect on blood pressure and heart rate. This study uses 15 female college students between the ages of 21 and 30 that were submitted to = two protocols for two cycling sessions one week apart: 400 mg of Caffeine and Placebo, consisting of blood pressure and heart rate readings at Baseline (pre-capsule time), Pre-exercise time before cycle ergometer session, Mid-exercise time during cycle ergometer session, Post-exercise (immediate) time at the end of cycle ergometer session, Post-exercise (15 min) time, Post-exercise (30 min) time, Post-exercise (60 min) time, Post-exercise (90 min) time, and Post-exercise (120 min) time. a power level of 70% of HRmax was recorded for the first session and duplicated for the second exercise session a week later. the second exercise session was identical to the first except the other capsules were taken for the second session. Caffeine was found to have no effect on blood pressure or heart rate before, during, or after exercise. a 2 x 9 repeated measures ANOVA was used to analyze heart rate, systolic blood pressure, and diastolic blood pressure. the results of this analysis can be used to further investigate if a possible safe increase in caffeine dosage will increase blood pressure and heart rate before, during, or after exercise which then can indicate possible negative cardiovascular responses due to caffeine.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Kinesiology
- Creator:
- Kato, Brittany
- Description:
- Physical activity (PA) may be a strategy to improve the quality of life of individuals with autism; however, few studies have examined interventions to promote PA in this population. This study explored the feasibility of a parent-led physical activity intervention, and investigated the intervention’s effect on PA levels, motor proficiency, and observed behavior and symptomatology. Participants included four children with a primary diagnosis of ASD, and their parent. Assessments of PA, motor proficiency, and observed behavior and symptomatology were obtained both at baseline and after completing the 12 week curriculum. Parents completed detailed checklists and a semi-structured interview to provide feasibility information. Results showed an increase in PA for participants who adhered to the intervention (n = 2). Participants (n = 3) showed no changes in motor proficiency or most behavior and symptomatology measures but improvements in repetitive behavior (n = 2). There were mixed ratings of acceptability of the curriculum across all participants, but the two participants who completed the intervention rated most of the activities at a difficulty level as “somewhat difficult” and rated enjoyment level as “liked it”. Those two families also reported positive observed changes in their child such as throwing ability, attending, and confidence. the perceived changes and acceptability for the families that adhered suggest this type of intervention may show promise for the future PA promotion among the youth with ASD.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Kinesiology
- Creator:
- Rowley, Christina A.
- Description:
- Although early preventive interventions that curtail the negative effects of chronic stress in childhood are needed, few preventive interventions exist for young children. the current study aimed to address this gap by testing the feasibility of a preventive intervention that teaches diaphragmatic breathing, a relaxation technique that counteracts the effects of physiological stress, to four to six-year-old children and their parents in a one-time group session. It was hypothesized that (1) diaphragmatic breathing would be successfully taught to young children and (2) multiple families in one single session, and that (3) parents would react positively regarding the intervention’s feasibility and acceptability. Three parent-child dyads participated, and data were collected at pre-intervention, post-intervention, and two-week follow-up. Parents reported on perceived understanding, acceptability, and feasibility of the intervention, interventionists rated the families’ ability to replicate diaphragmatic breathing, and parents and children rated the children’s social, emotional, and physical functioning. Overall, parents indicated that the intervention is understandable, acceptable for stress management, and feasible to implement, and successfully replicated the diaphragmatic breathing technique. All participants reported improvement in the children’s overall functioning. the present study contributed to existing literature by piloting a novel preventive intervention for young children and uncovering some unique challenges, primarily associated with recruitment, of leading an early childhood preventive intervention in a group format.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Psychology
- Creator:
- Al Jasar, Ahmed
- Description:
- Studies on using high strength steel as flexural and shear reinforcement in reinforced concrete members are limited in the literature. Thus, current ACI 318 provisions do not permit using reinforcement steel with a strength higher than 80 ksi as flexural or 60 ksi as shear reinforcement. Reinforcement with a strength of 100 ksi is allowed for confinement in special seismic applications. This research has two objectives. First, it examined the effect of using high strength steel (HSS) as flexural reinforcement in RC flat plates on punching shear resistance. Second, it investigated the feasibility of using the HSS as shear reinforcement to increase the punching shear capacity of RC flat plates. To accomplish these objectives, five half-scale RC flat plates were tested under monotonic loading. the experimental program consisted of one flat plate reinforced with 60 ksi as main reinforcement and has 60 ksi shear reinforcement, and four flat plates reinforced with 100 ksi as main reinforcement and have 0, 60, 80, and 100 ksi shear reinforcement in the form of hoops. the results show that replacement of conventional reinforcement steel (Grade 60) with high-strength steel for the flexural reinforcement increased the punching shear capacity by 6%. Also providing shear reinforcement with yield strengths of 60, 80 and 100 ksi increased the punching shear resistance by 7%, 11%, and 16% respectively. Conclusions were drawn based on the load-deflection relation and the strain distributions between the RC flat plates.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379770
- Campus Tesim:
- Fullerton
- Department:
- Department of Civil and Environmental Engineering
- Creator:
- Daoudi, Sarah
- Description:
- A small library of compounds synthesized at California State University, Fullerton, were screened for their anti-proliferative activity in three human cell lines: HeLa, HUTU80, and MG63. CyQUANT cell proliferation assay also showed some cell line specificity of best performing compounds. This project focuses on identification of the effects of the compound, LH14E, on p21, a cell cycle regulatory protein. Expression of CDKN1A (p21 gene) is regulated by p53 and KLF6, both of which attenuate cell proliferation. Our results show that LH14E increases expression of CDKN1A and the amount of p21 protein. Luciferase reporter gene assay revealed an increase in the transcriptional activity of the p21 promoter upon treatment with LH14E. Western Blot reveals p53 protein levels are not affected by treatment with LH14E, but KLF6 protein increases upon treatment with LH14E. These results suggest that LH14E activates KLF6 expression, and subsequently increases p21 expression, which together may cause cell cycle arrest. These analyses will help identify mechanism of action for the hit compounds in this library of compounds.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Biological Sciences
- Creator:
- Abdulkarim, Muslim A.
- Description:
- The behavior of civil structures, such as buildings and bridges, subjected to earthquake shaking is highly dependent on structural components which resist the lateral forces that result from ground acceleration. Modern seismic design strategies commonly utilize specially designed lateral components or details intended to yield or break under excessive accumulated force so as to protect the primary vertical structural system. Buckling-restrained braces (BRBs) are one popular type of seismic structural fuse that function by yielding a steel core in both tension and compression, since buckling of the core is restrained. the use of BRBs is popular in buildings due in part to their simple installation, ability to achieve large values of accumulated ductility while dissipating large amounts of energy, and a well-established design procedure including required prequalifying testing. However, there are no standard recommendations or guidelines for the design of BRB systems as seismic resisting elements for bridges. Further, there are no prequalifying loading protocols for demands on BRBs implemented on common bridge types. This thesis advances the standardization of procedures for implementing BRBs on bridges through the development of prequalifying testing protocols for steel truss bridges.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Civil and Environmental Engineering
- Creator:
- Stapley, Ashley L.
- Description:
- Research suggests that a critical cognitive mechanism involved in false memory is semantic memory. Humans are highly susceptible to false memory error which poses a problem for the reliability of eyewitness testimony. To combat this problem researchers have investigated how metacognitive monitoring and warnings can mitigate false memory formation. Warning individuals about memory errors showed decreases in false recall and recognition; however, the efficacy of warnings is still debated. The current study seeks to determine the extent of the effects of semantic interference on eyewitness memory, and to study which methods of warning are most effective at reducing false memory errors brought about by semantic interference. Participants were given one of three different warning types before beginning the experiment. All participants watched the pilot episode of the television show 24 to simulate a witnessed event. Participants then completed a semantic interference task that was followed by a memory test and confidence measures. Results indicated that those in the semantically related semantic interference task (SIT) condition performed better on the memory test indicating that the task facilitated rehearsal rather than promoting internally generated information. Participants given a warning exhibited poorer performance with decreased memory accuracy and higher false memory errors. This indicates that the warning might have made individuals overconfident in their ability to discern false memories from veridical memories.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379862
- Campus Tesim:
- Fullerton
- Department:
- Department of Psychology
- Creator:
- Wittig, Kelsey Lucille
- Description:
- Sufficient knowledge of physical activity (PA) is known to improve participation in and perception of one’s own PA levels. The aim of this study was to provide older adults with information about the U.S. Physical Activity Guidelines and evaluate the impact on participants’ knowledge of the guidelines and their accuracy in self-reporting their PA. 40 community-dwelling adults aged 65 years and older were randomly assigned into three groups. EXGR1 received education about the PA guidelines and EXGR2 received a modified PAS E as self-reported measure where PA examples were omitted from the text. Objective and self-report PA were measured by triaxial accelerometry and the Physical Activity Scale for the Elderly (PASE), respectively. in EXGR1, pre- and post-education correlations between total MVPA and total PAS E score found that the provision of information about the PA guidelines did not result in an improved accuracy of self-reported overall PA ( p = .473). No significant differences were found between PASE scores when PA examples were included or excluded in either EXGR2 pre-education (26.67 ± 28.27) and post-education (22.12 ± 2.43) or CON pre-education (11.18 ± 14) and post-education (10.11 ± 11.82) (p > .05). Since the education provided by the government regarding the PA guidelines had minimal effects in the current study, future researchers and professionals should work to increase PA participation and education about the PA guidelines.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379961
- Campus Tesim:
- Fullerton
- Department:
- Department of Kinesiology
- Creator:
- Rubio, Kayla
- Description:
- With the population growing older and living longer there is a need to find effective methods for assisting individuals maintain a high level of function so they can live independently well into their older adult years. Multicomponent exercise programs (i.e., strength, aerobic, flexibility, neuromotor training) are a viable option for staying physically active and mobile for older adults. a secondary database associated with the Fit4Life exercise program conducted at the Center for Successful Aging at California State University, Fullerton was analyzed to determine whether improvements in upper and lower body strength and dynamic balance and agility were evident following the completion of two rotations of a 10-week exercise program offered in the Fall and Spring semesters. Pre- and post-program assessment scores were compared for 65 community-dwelling older adults who participated in the Fit4Life program for two consecutive semesters between the years of 1997 and 2017. Significant post-program improvements were observed for the group in upper (p <. 001) and lower body strength (p< .001) as well as dynamic balance and agility (p = .003). Attendance frequency appeared to have the greatest influence on lower body strength improvements when the group was divided accorded to attendance frequency. Participation in a 20-week multicomponent exercise program appears to be beneficial in improving upper and lower body strength and dynamic balance and agility.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Kinesiology
- Creator:
- Ha, Margaret
- Description:
- Concussion symptoms may affect a student’s activity and productivity. Without proper management, symptoms can be exacerbated, lead to a prolonged recovery, and may ultimately affect their academic performance. Faculty play a key role in supporting a student’s return-to-school (RTS) following concussion. However, faculty perceptions of concussions have not been examined in higher education. Therefore, the purpose of this study was to examine the perceptions and experiences of faculty in higher education regarding concussion and its management process. Two hundred twenty-three faculty participated in an online survey and nine completed an in-person interview to further explore their perceptions. Descriptive statistics and Mann Whitney U tests were utilized to analyze survey data. An inductive qualitative approach was used to analyze interview data. Faculty identified cognitive and physical symptoms that may affect a student’s RTS, and less often identified emotional and sleep changes. Faculty with prior concussion education believed it was more important to decrease cognitive activities and understand the RTS process than their counterparts. However, no differences were found between faculty who had personally sustained a concussion compared to their counterparts. Faculty described issues students may encounter with RTS (e.g., difficulty processing information and environmental issues) and lack of clarity regarding the mechanisms for students to obtain support on campus. These findings support the need for ongoing dialogue on the process for students to obtain academic support following concussion.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Kinesiology
- Creator:
- Krupa, Lauren M.
- Description:
- This study examines the relationship between social anxiety and self-concept clarity. Previous research has shown that social anxiety and self-concept clarity are related, and that low self-concept clarity is a unique predictor of social anxiety. There has not been research on the mechanism behind this relationship, which is what the current study intended to do. Three research hypotheses were tested: (1) socially anxious individuals selectively attend to social threat information, (2) those with low self-concept clarity have increased social anxiety, and (3) information processing biases and self-concept clarity are both predictors of social anxiety, with self-concept clarity being the moderating predictor. In order to investigate attention biases, an Emotional Stroop task was used. The Amazon Mechanical Turk (MTurk) crowdsourcing platform was used to recruit 132 participants. Hypotheses 1 and 3 were not supported by the results. For hypothesis 1, social anxiety as measured by the Social Interaction Anxiety Scale (SIAS) and Social Phobia Scale (SPS) was not significantly correlated with reaction time on social threat word trials of the emotional Stroop task. For hypothesis 3, a hierarchical multiple regression found that while the first model with social threat trial reaction time on the emotional Stroop task and self-concept clarity, measured by Self-Concept Clarity Scale (SCCS) scores, as individual predictors was significant, the second model with the addition of the interaction term was not. Hypothesis 2 was supported in that self-concept clarity was significantly negatively correlated with social anxiety.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379909
- Campus Tesim:
- Fullerton
- Department:
- Department of Psychology
12. Leisure Activity and Perceptions of Social Support in Older Adults with and Without Fibromyalgia
- Creator:
- Phillips, Kristen
- Description:
- Fibromyalgia (FM) is a pervasive chronic pain condition that affects almost every aspect of daily life. Symptoms can be debilitating and severe, leading to precautionary and inactive lifestyles for those diagnosed. Perceived social support from loved ones has been shown to alleviate these negative symptoms and encourage pro-healthy behaviors. However, older adults with FM may react to both physical and psychosocial symptoms by reducing their participation in leisure activities, further limiting available sources of social support. Therefore, the purpose of the current study was to evaluate the influence of FM status and leisure activity on social support. by conducting secondary analyses on a sample of 240 older adults with and without fibromyalgia, it was hypothesized that FM status would moderate the relationship between social support and leisure activity. Results revealed that participants with fibromyalgia did report significantly less available social support compared to the healthy control group. Additionally, a positive association between leisure activity and social support was found when controlling for FM status. However, FM status did not moderate the relationship between leisure activity and social support. Despite this lack of impact by FM status, these findings provide additional support to the current literature suggesting that social support is linked with both chronic pain and leisure activity.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379749
- Campus Tesim:
- Fullerton
- Department:
- Department of Psychology
- Creator:
- Muneeb, Omar
- Description:
- A variety of alternative renewable fuels have been demonstrated on various catalyst surfaces that can be employed in alkaline direct liquid fuel cells (DLFCs). Palladium is an efficient catalyst for alcohol oxidation; however the oxidation rates for polyalcohols are slow to progress. Therefore, several ratios of PdxCuy/C (Pd63Cu37/C, Pd46Cu54/C, Pd28Cu72/C, Pd 11Cu89/C), PdxNiy/C (Pd16Ni 84/C, Pd53Ni47/C, Pd68Ni32/C) and Pd/C were synthesized and characterized for the electrochemical oxidation of ethylene glycol (EG), propylene glycol (PG), and glycerol (G). the greatest promotion for the oxidation of EG was observed on Pd28Cu72 /C (7 times faster than Pd/C), for PG on Pd11Cu89/C (12 times), and for G on Pd63Cu37/C (14 times). Furthermore, PG oxidation rate was enhanced 14 times on a Pd53Ni47/C catalyst. a significant shift in d-band center and an increase in hydroxyl adsorption at lower potentials were observed on each PdxCu y/C and PdxNiy/C catalyst compared to that of Pd/C. Therefore, the observed oxidation rate enhancements are due to the combination of the electronic effect and bifunctional effect. Ascorbic Acid (Vitamin C), an environmentally and biologically friendly compound was also investigated as a renewable alternative fuel. This study reports a direct ascorbate fuel cell that produced a maximum power density of 73 mW cm-2 with Pd and improved to 89 mW cm-2 with Pd28Cu72 /C as the anode catalysts. in addition, this work demonstrates an operating ascorbate fuel cell that does not require metal catalysts by simply using carbon black nanoparticles at each electrode.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379848
- Campus Tesim:
- Fullerton
- Department:
- Department of Chemistry and Biochemistry
- Creator:
- Nguyen, Romie Ca Dao Tu
- Description:
- The Wnt Signaling pathway has been implicated in stem cell maintenance and incidence of various types of cancer due to the presence of β-catenin, a transcriptional coactivator. It binds to TCF/LEF family proteins and activates the transcription of target genes such as c-myc or cyclin D1 which are necessary for cell division. This project began by synthesizing small molecules to promote the accumulation of β-catenin to maintain stem cell pluripotency. However, TOPFlash, a method that indirectly measures β-catenin, suggested that some compounds significantly decreased β-catenin levels. Because Wnt signaling (elevated levels of β-catenin) is also implicated in cancer, the project shifted towards synthesizing compounds with similar scaffolds to lower β-catenin levels. Goals of the project were to identify important functional groups by probing physical and chemical characteristics such as sterics, electronic effects, and polarity, and account for cost and ease of synthesis for a more practical application. Cell proliferation assay data shows an interesting trend towards bulky alkyl groups and their observable decrease in cell growth compared to more electron withdrawing groups or even their shorter or longer chained counterparts. Compounds that performed well in their initial cell proliferation screenings were tested with immunocytochemistry assays to visualize β-catenin accumulation and western blots to quantify the concentration of β-catenin via intensity and thickness of the band, potentially implicating the role of the compounds and their disruption of Wnt signaling.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379886
- Campus Tesim:
- Fullerton
- Department:
- Department of Chemistry and Biochemistry
15. Enhanced Performance of the Mimo Channel by Using the Beamforming Technique and the Rack Receiver
- Creator:
- Alaamer, Mohanad Saleh M.
- Description:
- In recent years, the demands for high data rate and reliable transmission have increased in wireless communications systems due to the wide use of web applications. the key technology that achieves these requirements is the application of Multiple Input Multiple Output (MIMO). The MIMO system exploits the multipath propagation by using multiple transmitted antennas to send the signal to multiple received. the MIMO system classification depends on whether the focus of the MIMO processing is on improving reliability, by creating spatial diversity, or on maximizing throughput, by performing spatial multiplexing. There are different ways to achieve spatial multiplexing, which are Layered Space Time coding and beamforming technique. In this thesis, I will investigate and analyze the performance of the MIMO channel by creating the combination of using the beamforming technique and the rack receiver to achieve both spatial multiplexing, which improves the data rate, and the diversity, which increases the reliability of the MIMO channel. the proposed technique uses DSSS-CDMA with-BPSK and QPSK modulation in a Slow Rayleigh flat fading environment. to apply the beamforming, I assume the transmitter has knowledge of the channel state information, that will decouple the MIMO channel to sub-independent parallel channels. It is shown that by using the combination of the beamforming and the rack receiver at each sub-channel, the signal-to-noise ratio for each sub-channel will increase, so the reliability of the MIMO channel will improve. Also, the capacity of the MIMO channel will increase.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379541
- Campus Tesim:
- Fullerton
- Department:
- Department of Electrical Engineering
- Creator:
- Higgins, Elizabeth
- Description:
- This thesis seeks to understand the sociocultural, political, and economic influences of the growing nonreligious population in the United States. This study will be conducted through examining the demographics of the nonreligious population, their socio-political involvement within society, as well as the creation of a community specifically designed for those who do not claim belief in a religious dogma. As the nonreligious do not have formal physical places to congregate such as their religious counterparts do, I argue that the population of those in the United States who claim to be religious “nones” has created a community of their own. This has gained much momentum in the 21st century with the use of social media as a platform, that in turn resulted in the creation of a virtual geography, with a time and a place that exist online for the nonreligious to meet. Once these virtual geographies were established and strengthened, especially in more recent years, this led to the creation of physical communities for the nonreligious population through conventions and regular monthly meetings. As the nonreligious has grown into an active community of people seeking to make change in the culture around them, they have become more involved in activism, policymaking, and have begun to make impacts in the political and sociocultural sphere. The extent to which the community is impacting society has been underreported in academia, and this study seeks to inform and fill in some of those gaps.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438393691
- Campus Tesim:
- Fullerton
- Department:
- Department of Geography and the Environment
17. The Geology and Paleontology of a Vertebrate Bonebed from the Middle Eocene of Southern California
- Creator:
- Santos, Gabriel-philip F.
- Description:
- Eocene terrestrial vertebrate assemblages have been described from formations throughout Southern California, such as the Sespe Formation, the Mission Valley Formation, and “Member C” of the Santiago Formation. Vertebrate assemblages from these formations are similar but geographically distant from each other. In Orange County, outcrops of the Sespe Formation and undifferentiated Santiago Formation are in close proximity, but fossils from the Santiago Formation of Orange County have not been previously described. Paleontology mitigation monitoring of the Talega Housing Development in San Clemente, Orange County in 1998 excavated a vertebrate bonebed from the undifferentiated Santiago Formation and provides the first opportunity to study Eocene terrestrial vertebrates from the formation. The bonebed, named the Talega Bonebed, is approximately 10 cm thick and comprised of densely deposited, disarticulated skeletal elements with no obvious associations and varying states of preservation. the bonebed was excavated as 46 cubic meter blocks, five of which have been prepared. Thus far, the Talega Bonebed is a highly productive fossil stratum with 24 taxa identified to date. Due to the size of the bonebed and method of excavation, the Talega Bonebed is significant for the study of terrestrial vertebrates from late Uintan of Southern California as it has the potential to provide numerous specimens of macrovertebrates that are relatively rare in contemporaneous strata and provides the first opportunity to study the taphonomy of an Eocene-aged site from Southern California.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379633
- Campus Tesim:
- Fullerton
- Department:
- Department of Geological Sciences
18. The Biomechanical Effects of Fatigue on Drop Jump Performance in Recreational Basketball Athletes
- Creator:
- Ondatje, Warren
- Description:
- Anterior Cruciate Ligament (ACL) injuries have high occurrences in the sport of basketball due to the high amounts of landing, cutting, and other sudden deceleration maneuvers. During landing, studies have prospectively linked insufficient amounts of knee flexion, greater knee valgus angles, and greater knee valgus moments accompanied by greater vertical ground reaction force to increased risk of ACL injuries. These mechanisms have shown to be increased in a fatigued state therefore suggesting an athlete may be at greater risk for ACL injury when they are fatigued. Research to support this claim, however, is inconclusive. Therefore, the purpose of this study was to examine the difference in peak knee flexion angle (pKFA), peak knee valgus angle (pKVA), peak knee valgus moment (pKVM), and peak vertical ground reaction force (vGRF) during the landing phase of a drop jump task in basketball athletes. Twenty-five subjects participated in the study and performed three drop jump trials before and after a fatigue protocol involving repeated countermovement jumps touching a specific target. Kinematic data was captured via a 9-camera motion capture system while kinetic data was captured with two AMTI force plates. Paired t-tests showed subjects landed with significantly greater pKFA post fatigue (p < .05) while pKVA, pKVM, and pGRF showed no difference pre- and post-fatigue (p > .05). Subjects in this study adopted a safer landing strategy post fatigue, hence, suggesting our study did not support the claim that athletes would be at greater risk for ACL injuries in a fatigued state.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379701
- Campus Tesim:
- Fullerton
- Department:
- Department of Kinesiology
- Creator:
- Garcia, Steven A.
- Description:
- The primary focus of golf research has investigated the kinematic and recently, the kinetic differences between low and high handicap golfers. However, research and golf instruction are not appropriately accounting for individual characteristics within golfers. Therefore, the purpose of this study was to investigate the effect of center of mass (COM) translation on ground reaction force (GRF) ratios, and the relationship between vertical jump performance and these variables. 20 Collegiate and 20 recreational golfers were recruited for this study. Full body golf biomechanics were collected and all participants completed three maximal countermovement jumps and five swings with both a 5-iron and driver. Pearson correlations were used to analyze the relationship between the vertical jump and golf swing variables. Independent t -tests were used to compare recreational and collegiate golfers. Rate of force development in the jump was correlated with the Vertical GRF ratio (p = 0.018, r = -0.548) in the 5-iron and in the driver, was correlated to the COM position and vertical GRF ratio (p = .007, r = -0.613, and p = .009, r = -0.596). COM position was correlated to the vertical GRF ratio (p = .011, r = 0.570) and ML GRF ratio was correlated to both the AP GRF and vertical GRF ratio (p = .008, r = 0.572, p = .001, r = 0.705). COM position was correlated with vertical GRF ratio (p = .000, r = 0.730). The vertical jump may be a novel approach to identifying individual differences within golfers. However, future research needs to investigate additional tests that assess force production in multiple planes in order to comprehensively evaluate preferred loading characteristics in the golf swing.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379657
- Campus Tesim:
- Fullerton
- Department:
- Department of Kinesiology
- Creator:
- Hsu, David
- Description:
- Manganese (Mn) oxides play an important role in the biogeochemical cycling of carbon, sulfur, and iron, and can also act as a sorbent or oxidant for various toxic trace metals. the formation of Mn oxides is primarily driven by Mn-oxidizing microbes, as abiotic Mn oxidation is slow. Erythrobacter sp. SD21 is unique among Mn-oxidizing bacteria, since it carries a novel Mn(II)-oxidizing protein (MopA). To better study MopA and Mn oxidation in this strain, a genetic system was developed in Erythrobacter sp. SD21. Transformation efficiencies were tested for three broad host-range plasmids and a transposon carrying plasmid (pUT/mini-Tn5Km ) through both chemical transformation and electroporation. Following uptake of both broad host-range and transposon carrying plasmids, two applications of the genetic systems were explored: transposon mutagenesis and inducible protein expression. Transposon-insertion mutants were produced and analyzed through inverse PCR and sequencing to identify genes associated with a change in Mn oxidation. A mutant with reduced Mn(II)-oxidation had a transposon insertion in a chemotaxis receptor-related gene. The potential for inducible protein expression was developed by cloning the sequence coding the catalytic domain of MopA into pJN105, using the Polymerase Incomplete Primer Extension (PIPE) cloning method.
- Resource Type:
- Masters Thesis
- Identifier:
- 9780438379916
- Campus Tesim:
- Fullerton
- Department:
- Department of Biological Sciences