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Articles 61 - 71 of 71
Full-Text Articles in Life Sciences
Ancient Mitochondrial Dna From Pre-Historic Southeastern Europe: The Presence Of East Eurasian Haplogroups Provides Evidence Of Interactions With South Siberians Across The Central Asian Steppe Belt, Jeremy R. Newton
Masters Theses
Studies of mitochondrial DNA (mtDNA) polymorphism have provided valuable insights for understanding patterns of human migration and interaction. The ability to recover ancient mtDNA sequence data from post-mortem bone and tissue samples allows us to view snapshots of historic gene pools firsthand, provided that great care is taken to prevent sample contamination. In this study, we analyzed the DNA sequence of the first hypervariable segment (HVSI) of the mtDNA control region, as well as a portion of the coding region, in 14 individuals from three collective burials from the Neolithic Dnieper-Donetz culture and three individuals from Bronze Age Kurgan burials, …
Structural And Functional Analysis Of Toc75, Ashita Mukul Dave
Structural And Functional Analysis Of Toc75, Ashita Mukul Dave
Masters Theses
The majority of chloroplast proteins are nuclear-encoded and post-translationally imported into the chloroplast. These newly imported proteins are translocated from the cytosolic compartment to the stroma by the Translocons of the Outer/Inner membranes of Chloroplast (TOC/TIC). In order to understand protein transport across the chloroplast outer membrane, it is crucial to investigate the structure and function of these complexes. The TOC complex is composed of the beta-barrel channel protein Toc75 and the GTPase receptors Toc34 and Toc159.
Toc75 is a member of the OMP85 (Outer Member Protein, 85 kDa) superfamily. Other proteins of the OMP85 superfamily also exist in Gram-negative …
Study Of The Structure And Function Of Cxc Chemokine Receptor 2, Hae Ryong Kwon
Study Of The Structure And Function Of Cxc Chemokine Receptor 2, Hae Ryong Kwon
Masters Theses
It has been shown that the amino terminus and second extracellular loop (EC2) of CXCR2 are crucial for ligand binding and receptor activation. The lack of an ionic lock motif in the third intracellular loop of CXCR2 focuses an investigation of the mechanism by which these two extracellular regions contribute to receptor recognition and activation.
The first objective of this investigation was to predict the structure of CXCR2 based on known structures of crystallized GPCRs. Rhodopsin, β2-adrenergic receptor, CXCR4 were used for homology modeling of CXCR2 structure. Highly conserved motifs found in sequence alignments of the template GPCRs were helpful …
Four Aspects Of Dogwood Pollination: Insect Visitation, A Novel Approach To Identify Pollen, Floral Volatile Emission, And Tracking Parentage, Paul Raymond Rhoades
Four Aspects Of Dogwood Pollination: Insect Visitation, A Novel Approach To Identify Pollen, Floral Volatile Emission, And Tracking Parentage, Paul Raymond Rhoades
Masters Theses
Part 1: Visitation of potential pollinators to Cornus florida and C. kousa flowers was assessed in East Tennessee in 2008 and 2009. Data regarding insect visitation rates to multiple trees per location were gathered throughout the flowering period. Diurnal and seasonal variations in visitation were recorded. Pollen coverage was assessed on portions of captured insect exoskeletons that were most likely to contact the stigma. Eleven families in four insect orders were collected from C. florida and 26 families in five orders from C. kousa. The most important pollinators in eastern Tennessee were bees in the Andrenidae and Halictidae. The most …
Linkage Analysis Of Caffeine Resistance And Circadian Rhythm In Caffeine-Treated Ddt Resistant And Susceptible Strains Of Drosophila Melanogaster, Chandrashis Bhowmick
Linkage Analysis Of Caffeine Resistance And Circadian Rhythm In Caffeine-Treated Ddt Resistant And Susceptible Strains Of Drosophila Melanogaster, Chandrashis Bhowmick
Masters Theses
Caffeine is found in coffee, tea, soft drinks, many plant products and various drug preparations. It is the most consumed common psychoactive drug around the world. Consumption of caffeine causes several behavioral and physiological responses in humans and other mammals. Caffeine is also known to be an insect repellant and can be used as an insecticide. As observed in mammals, caffeine treatment increases the locomotor activity in insects including Drosophila. However, very little is known about genetic and molecular basis of caffeine sensitivity and action in insects. In the present study, I have used DDT resistant (91-R) and susceptible …
Studies On The Mechanisms Of Homolog Pairing And Sister Chromatid Cohesion During Drosophila Male Meiosis, Jian Ma
Masters Theses
Meiosis is a complex process involving one round of DNA replication followed by two rounds of cell divisions. The proper segregation of homologs at meiosis I and sister chromatids during meiosis II is essential for the survival of the offspring. Aberrant chromosome segregation at any stage of meiosis can lead to aneuploidy. Meiotic chromosome segregation without crossing over or chiasmata is a widespread but poorly understand chromosome segregation pathway. In male Drosophila meiosis the absence of recombination in chromosomes makes it easier to identify mutations which influence homologous chromosome pairing and segregation.
Modifier of Mdg4 in Meiosis (MNM), a protein …
The Effects Of Acute Ethanol Treatment On The Suprachiasmatic Nucleus In Adult Male Mice, Charles Andrew Mangrum
The Effects Of Acute Ethanol Treatment On The Suprachiasmatic Nucleus In Adult Male Mice, Charles Andrew Mangrum
Masters Theses
Light is the primary entraining signal for the mammalian circadian clock located in the suprachiasmatic nucleus (SCN). Light entering the eye leads to release of glutamate directly onto SCN neurons where it binds to N-methyl D-aspartate (NMDA) receptors initiating a cascade of cellular processes that ultimately modulates clock phase. SCN neurons show a 24-hour rhythm in neuronal activity that peaks in the middle of the day when isolated in a brain slice preparation. Treatments that phase-shift the SCN clock in vivo have been shown similarly to shift this rhythm of neuronal activity in vitro. Here, I have investigated …
Isolation And Characterization Of The Triiodothyronine Regulatory Region Of The Fatty Acid Synthase Gene In Avian Species, Delfina Rivera Valencia
Isolation And Characterization Of The Triiodothyronine Regulatory Region Of The Fatty Acid Synthase Gene In Avian Species, Delfina Rivera Valencia
Masters Theses
Fatty acids are utilized for energy storage in the form of triglycerides or neutral fats. One way to regulate fatty acid biosynthesis is to regulate the activity of fatty acid synthase (FAS), the enzyme that catalyzes the reaction. Previous studies have shown that regulation of FAS activity and synthesis is regulated by the hormone triiodothyronine, T3, at the level of transcription. Thus, isolation and characterization of the promoter region o f the FAS gene will enable the identification of the thyroid hormone response elements (TREs). This study could shed light on the mechanisms on how this gene can …
Yeast Mannans: Use As A Transport Vehicle For Peptides, Jacqueline Cesario Lee
Yeast Mannans: Use As A Transport Vehicle For Peptides, Jacqueline Cesario Lee
Masters Theses
Yeast mannans are phosphorylated glycopeptides found in various species of yeast. Their similarity to the mannose-phosphate signal for intracellular lysosomal uptake led mannans to be considered as a possible vehicle for increasing cellular affinity for peptides. Insulin was used as a model peptide and was conjugated to mannans by two coupling methods. The conjugated mannan-insulins were compared to insulin on the basis of cellular binding and ability to induce typical insulin biological effects.
Comparison Of Surface Polysaccharides Of R. Leguminosarum Anu57 (Exo-1), R. Leg. Anu57(Pbr1an) (Nod+, Nif-), And R. Leg. Anu57(Pjb5j1) (Nod+, Nif-), Frank G. Hustmyer
Comparison Of Surface Polysaccharides Of R. Leguminosarum Anu57 (Exo-1), R. Leg. Anu57(Pbr1an) (Nod+, Nif-), And R. Leg. Anu57(Pjb5j1) (Nod+, Nif-), Frank G. Hustmyer
Masters Theses
Extracellular polysaccharides (EPS) and lipopolysaccharides (LPS) are suspected to be involved in the legume/Rhizobium symbiotic process. Polysaccharide compositions from the EPS, LPS, capsular polysaccharide (CPS), and small polysaccharide (SmPS) were compared between Rhizobium leguminosarum ANU57 (parent, Exo-1) and two mutants R. leg. ANU57(pBR1AN) (nod+, nif-) and R. leg. ANU57(pJB5J1) (nod+, nif-) both containing a Sym (symbiotic) plasmid insertion. R. leg. ANU57(pBR1AN) and R. leg. ANU57(pJB5J1) are nod+ on clover and peas, respectively. The nod+ mutants produce larger amounts of EPS and decreased amounts of LPS compared to …
Membrane Bound Nadh Oxidase Complex Of Micrococcus Lysodeikticus, Karen Ju-Kuang Hsia
Membrane Bound Nadh Oxidase Complex Of Micrococcus Lysodeikticus, Karen Ju-Kuang Hsia
Masters Theses
No abstract provided.