Submitted by the University of Missouri--Columbia Graduate School最新文献_第4页

A multi-scale investigation of ecologically relevant effects of agricultural runoff on amphibians 农业径流对两栖动物生态相关影响的多尺度调查

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/6641

B. Williams

{"title":"A multi-scale investigation of ecologically relevant effects of agricultural runoff on amphibians","authors":"B. Williams","doi":"10.32469/10355/6641","DOIUrl":"https://doi.org/10.32469/10355/6641","url":null,"abstract":"Low levels of agricultural herbicides often contaminate surface water and may persist throughout the growing season, potentially acting as stressors on aquatic organisms. Although low-dose, chronic exposures to agrochemicals are likely common for many non-target organisms, studies addressing these effects using end-use herbicide formulations are rare. We exposed three common species of tadpoles to conservative levels of atrazine, S-metolachlor, and glyphosate end-use herbicide formulations throughout the larval period to test for survival differences or life history trait alterations. Exposure to the glyphosate product Roundup WeatherMax® at 572 ppb glyphosate acid equivalents (a.e.) resulted in 80% mortality of western chorus frog tadpoles, likely as a result of a unique surfactant formulation. Exposure to WeatherMax® or Roundup Original Max® at 572 ppb a.e. also lengthened the larval period for American toads. Chronic atrazine and S-metolachlor exposures induced no significant negative effects on survival, mass at metamorphosis or larval period length at the levels tested. These results highlight the importance of explicitly tying chronic tests to the natural environment and considering contributions of surfactant/adjuvant components to end-use formulation toxicities, even between very similar products.","PeriodicalId":285769,"journal":{"name":"Submitted by the University of Missouri--Columbia Graduate School","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131963642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Molecularly imprinted polymer labeled with quantum dots for detection of nitroaromatic explosives 用量子点标记的分子印迹聚合物检测硝基芳香炸药

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/10244

R. Stringer

{"title":"Molecularly imprinted polymer labeled with quantum dots for detection of nitroaromatic explosives","authors":"R. Stringer","doi":"10.32469/10355/10244","DOIUrl":"https://doi.org/10.32469/10355/10244","url":null,"abstract":"A sensing device for explosive compounds is a fundamental step towards the capability to detect the presence of landmines, improvised explosive devices (IEDs), and other unexploded ordinance. To detect high explosive compounds such as 2,4,6-trinitrotoluene (TNT), an optical sensor utilizing molecularly imprinted polymer (MIP) technology was developed. This sensor consists of MIP microparticles prepared using methacrylic acid as the functional monomer in a precipitation polymerization reaction. The MIP particles are combined with fluorescent semiconductor nanocrystals, or quantum dots, via a simple crosslinking procedure. The MIP is then capable of rebinding the explosive compound, which quenches the fluorescence of the covalently linked quantum dots. After preliminary studies of the basic sensing mechanism, a precipitation polymerization reaction was used to create MIP particles with a uniform spherical shape and sub-micron size, as well as MIP particles with a porous mesh-like morphology. A comparison study of these two types of particles indicated that the MIP microspheres were more effective at binding the nitroaromatic explosive TNT and its breakdown product 2,4-dinitrotoluene (DNT). The MIP microsphere-based fluorescence sensing scheme was then entrapped into a sol-gel matrix and applied to a solid substrate sensor platform for detection of vapor-phase explosives. However, the detection method showed poor performance and was unsuitable for sensing of airborne nitroaromatic explosive compounds.","PeriodicalId":285769,"journal":{"name":"Submitted by the University of Missouri--Columbia Graduate School","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132456360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Women of the northern stage : gender, nationality and identity and the work of Canadian women stage directors 北方舞台女性:性别、国籍、身份与加拿大女性舞台导演的工作

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/40117

Emily A. Rollie

{"title":"Women of the northern stage : gender, nationality and identity and the work of Canadian women stage directors","authors":"Emily A. Rollie","doi":"10.32469/10355/40117","DOIUrl":"https://doi.org/10.32469/10355/40117","url":null,"abstract":"Studies in 1982 and 2006 conducted by the Canadian government and Canadian professional theatre organizations, respectively, revealed that Canadian women directors have been and continue to be underrepresented in relation to their male counterparts. Despite this disparity, however, Canadian women stage directors are creating innovative theatre and re-visioning traditional works. Whether directing work by and about women, re-staging canonical works, developing new multi-media work, or experimenting with new rehearsal methods, these women directors are ostensibly destabilizing conventional aesthetic forms and providing social critique through artistic innovation. Outside Canada, however, these women are largely unrecognized, and English language scholarship that investigates “American” or “North American” theatre often focuses exclusively on the US. Utilizing feminist historiography and qualitative case study methods, this study addresses that omission and investigates the work and directorial methods of four prominent Canadian women directors: Nina Lee Aquino, Kim Collier, Jillian Keiley, and Kelly Thornton. Through one-on-one interviews with each director, rehearsal and performance observations, and available critical reviews and archival documents, this project considers these directors’ artistic contributions, directorial methods, and the ways that gender, nationality, and other intersecting identities such as race, class, sexuality, and regionality impact their work. Ultimately, this project intends to contribute to the current and ongoing conversation about the status of Canadian women in theatre as well as to larger global discourses surrounding issues of gender, nationality and the arts.","PeriodicalId":285769,"journal":{"name":"Submitted by the University of Missouri--Columbia Graduate School","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134260950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of leptin on placental development and function, and offspring behavior in mice 瘦素对小鼠胎盘发育、功能及子代行为的影响

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/44194

K. Pollock

{"title":"The effects of leptin on placental development and function, and offspring behavior in mice","authors":"K. Pollock","doi":"10.32469/10355/44194","DOIUrl":"https://doi.org/10.32469/10355/44194","url":null,"abstract":".......... ....................................................................................................................... x 1. REVIEW OF THE LITERATURE.............................................................................................. 1 1.1 Leptin .................................................................................................................................... 1 1.1.1 Overview .................................................................................................................. 1 1.1.2 Structure of the Gene, mRNA and Protein of Leptin and Its Receptors ................................................................................3 1.1.3 Expression of Leptin and Its Receptors .........................................................4 1.1.4 Regulation of Leptin ......................................................................................5 1.1.5 Models for Leptin Research ..........................................................................6 1.1.3 Leptin and Energy Homeostasis ....................................................................9 1.2 Leptin and Reproduction........................................................................................11 1.2.1 Implantation and Placentation ................................................................................ 11 1.2.1.1 Mice ........................................................................................................... 11 1.2.1.2 Humans ...................................................................................................... 12 1.2.2 Leptin during Pregnancy .............................................................................13 1.2.2.1 Implantation ............................................................................................... 13 1.2.2.2 Placenta ..................................................................................................... 15 1.2.3 Leptin's Role in Pregnancy Related Disorders.. ........................................16","PeriodicalId":285769,"journal":{"name":"Submitted by the University of Missouri--Columbia Graduate School","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133871110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Consequence of winning: Interdisciplinary analysis for deontological perspectives of moral function and the interaction with motivation in Division I college athletes 胜利的结果:大学一级运动员道德功能义务论视角与动机互动的跨学科分析

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/37798

Brandon Orr

引用次数: 0

Identification of an extracellular adenosine 5'-triphosphate receptor in Arabidopsis thaliana 拟南芥胞外腺苷5′-三磷酸受体的鉴定

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/44669

Jeongmin Choi

引用次数: 1

A noninvasive approach to understanding adaptation, crop raiding behavior, and the fecal microbiota of the African elephant 一种非侵入性的方法来了解非洲象的适应、作物掠夺行为和粪便微生物群

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/44656

Tabitha M. Finch

引用次数: 4

Mating systems in Nicotiana longiflora and N. plumbaginifolia: The effect of interspecific interactions 长叶烟叶和白桦的交配系统:种间相互作用的影响

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/5587

D. M. Figueroa‐Castro

{"title":"Mating systems in Nicotiana longiflora and N. plumbaginifolia: The effect of interspecific interactions","authors":"D. M. Figueroa‐Castro","doi":"10.32469/10355/5587","DOIUrl":"https://doi.org/10.32469/10355/5587","url":null,"abstract":"The research presented here was focused on the effects of interactions between Nicotiana longiflora and N. plumbaginifolia on their mating systems. First, I conducted a series of observations and pollination experiments in natural populations to determine interpopulational variability in traits associated with mating system. Second, I determined if this variability also exists in the realized mating systems (i.e. outcrossing rates) and if it is affected by sympatry. Finally, I explore the importance of post-pollination mechanisms determining offspring paternity in natural population of both Nicotiana species. Results showed significant interpopulational variability in N. longiflora floral traits but not in the selfer N. plumbaginifolia. Sympatry showed a negative effect on N. longiflora fitness and N. plumbaginifolia outcrossing rate. An increase in genetic diversity was detected on sympatric N. plumbaginifolia populations, suggesting the occurrence of hybridization with N. plumbaginifolia being the maternal parent. Overall, this research strongly supports that interactions between N. longiflora and N. plumbaginifolia are occurring in sympatric natural populations at the present time. In sympatry, asymmetrical hybridization is a possibility, but a decrease in outcrossing rates in N. plumbaginifolia as well as strong preference for outcross pollen in N. longiflora might be acting as isolation mechanisms.","PeriodicalId":285769,"journal":{"name":"Submitted by the University of Missouri--Columbia Graduate School","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132792038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Necessary imbalance: ceramic sculpture as human social analogue 必要的不平衡:陶瓷雕塑作为人类社会的类似物

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/10554

Domonique Anare Venzant

引用次数: 0

Resistance exercise timing and metabolic risk factors in type 2 diabetics 2型糖尿病患者抗阻运动时机与代谢危险因素

Submitted by the University of Missouri--Columbia Graduate School Pub Date : 1900-01-01 DOI: 10.32469/10355/44469

Timothy D. Heden

引用次数: 0