College of Arts and Sciences - Bellarmine University

More documents

Recommendations

Info

BIOLOGYPoster 1:How do the Various Bone Components AffectBending Fracture Strength?Anna Harvey / Faculty Sponsor: Dr. David PortaBone is a composite material made up of organic (collagen) and inorganic (mineralsand water) components. We wanted to study how the various components affectfracture strength. 41 ribs were dissected from 5 cows, 1 deer, and 1 pig. Using 4 ribsfrom the same animal would allow for testing of multiple parameters (1 control and3 treatments) on relatively uniform bone. Treatment groups included demineralization(HCl bath), dehydration (105°C for 24 hrs), or denaturation (600°C for 24hrs). Each rib was fixed in a vise and broken by a swing arm. The bending strength(N) was measured using an Omega DLC101-5k force transducer and Instrunet software.Testing was captured on high speed video (up to 600 fps) and fracture patternswere analyzed. As expected, fracture force for the cow ribs was higher than thedeer or pig in all cases. Average fracture strength of the control cow ribs was 358 ±65 N. The average strength of the demineralized and dehydrated cow ribs were 236± 59 N and 199 ± 33 N respectively. Denatured bones failed at 157 ± 45 N, thus theloss of proteins seems to have the greatest affect on bending fracture strength.Poster 2:Are People Compromising Tooth Strengthfor a Whiter Smile?Becca Young / Faculty Sponsor: Dr. David PortaTooth whitening is the most popular cosmetic dental service offered- but doesit affect strength? Previous in vitro studies examined dentin strength and toothfracture toughness after bleaching. Our controlled study investigates the fracturestrength of in situ whole human teeth subject to impact. Mandibles from 5 cadaverswere sectioned into right and left sides that were assigned to either bleach or controlgroups (16 teeth each). Teeth were bleached using Crest© Whitestrips. Individualteeth were fractured by a transducer/bolt (Omega DLC101-5k) hammeredat low speed. Peak force (N) was recorded using Instrunet software and testing wascaptured on high-speed video (up to 600 fps). There was no significant difference(p=0.463) between the fracture forces of the bleached teeth (83.7 +/-67.5N) versusthe controls (81.8 +/-43.1N). Three different fractures were observed: a) Root/crown fracture (n=10 bleached & 9 control teeth), b) Complete extraction (n=3bleached & 6 controls), and c) Mandibular fracture (n=3 bleached & 1 control). Todetermine if the bleaching affected mineral content (MC), teeth were ashed (12 hrs@ 900°C). Bleached teeth showed an average MC of 75.8% (+/-2.8%) while controlswere 77.6% (+/-4.0%). Our data do not support the hypothesis that bleachingdecreases fracture strength.4
Poster 3:How Do Lynx, Addax, and Goat Long Bones CompareTo Human Bones in Torsion Testing?Jennifer Daniel, Heather Sauer / Faculty Sponsor: Dr. David PortaTorsional fracture force is an excellent measure of overall bone integrity. Limitedresearch on animals has been done in the past.Our study focuses on torsional forcesused to break 31 long bones dissected from an addax, goat, and lynx collected fromThe Louisville Zoo. The bones were stripped of all flesh and potted into metalboxes using Easy-Flo 60 polyurethane casting resin. The proximal end was laterallytorqued to failure by use of a hand wrench. Signals from an inline Torque Sensor(SenDev model 01190-123) were fed to a computer running InstruNet WorldWin32 software. Fractures were captured on high speed video at up to 600 fps. Thetorsional fracture strength of long bones from the addax ranged from 53 Nm for themetatarsal to 174 Nm for the tibia/fibula. The weakest goat bone failed at 43 Nmwhile the right humerus broke at 191 Nm. The lynx bones were the weakest of thegroup. The ulna broke at 2 Nm while the femur broke at 24.2 Nm. All bones fracturedin the predicted spiral pattern seen in previous human long bone testing. Theaddax was found to be most comparable to human strength in this pilot study.Poster 4:Treatment of a Non-Small Cell Lung AdenocarcinomaCell Line With High Concentrations of theEnvironmental Estrogens Sodium Arsenate andCadmium ChlorideRachel Amshoff / Faculty Sponsor: Dr. Mary HuffThe environmental estrogens sodium arsenate and cadmium chloride are two heavymetals found in cigarette smoke. Recent studies have shown that nanomolar concentrationsof sodium arsenate and cadmium chloride can induce cellular proliferation,thus taking on the role of carcinogens. In contrast, micromolar concentrationsof these same carcinogens inhibit cell growth and promote apoptosis. Using cellproliferation assays, the purpose of this study was to determine the LD 50for bothsodium arsenate and cadmium chloride in the non-small adenocarcinoma lung epithelialcell line H1793. The LD 50for sodium arsenate and cadmium chloride after4 days of treatment was determined to be 48.8 µM and 1.62 µM, respectively. Immunoblotanalysis of the pro-apoptotic protein Bax indicated an increase in proteinlevels after one day of treatment with 40 µM sodium arsenate and 1 µM cadmiumchloride thus supporting a role for apoptosis in cell death.5
Page 1 and 2: BELLARMINE UNIVERSITYPresentsthe Ni
Page 3: BELLARMINE UNIVERSITYPresentsthe Ni
Page 7 and 8: Poster 7:Continued Studies of Ventr
Page 9 and 10: BIOCHEMISTRY &MOLECULAR BIOLOGYPost
Page 11 and 12: CHEMISTRYPoster 15:Developing a New
Page 13 and 14: Poster 19:Diagnosis of T-Cell Acute
Page 15 and 16: CRIMINAL JUSTICE STUDIESPoster 22:T
Page 17 and 18: ECONOMICSPoster 27:Decreasing Inequ
Page 19 and 20: Poster 32:Effects of MalnutritionEl
Page 21 and 22: Poster 36:Tourism in the Indonesia-
Page 23 and 24: MANAGEMENT SCIENCEFaculty Sponsor f
Page 25 and 26: Poster 47:Bath & Body Works Product
Page 27 and 28: MATHEMATICSPoster 54:Basic Model fo
Page 29 and 30: NURSINGPoster 58:Evidence-Based Pra
Page 31 and 32: PSYCHOLOGYFaculty Sponsor for All P
Page 33 and 34: Poster 66:Sexual Motivators Among C
Page 35 and 36: Poster 72:The Art of Video Games: A
Page 37 and 38: Poster 78:Have Junk Food Ads Target
Page 39 and 40: Poster 82:The Ethical Responsibilit
Page 41 and 42: Poster 86:The Ethics of Bias in War
Page 43 and 44: Poster 90:War Photography: When is
Page 45 and 46: BROWN SCHOLARSFaculty Sponsor for A
Page 47 and 48: Poster 99:Guatemala: Viewing the Wo
Page 49: ENGLISHPoster 101:The Social Self:

College of Arts and Sciences - Bellarmine University

Create successful ePaper yourself

Delete template?

Save as template?