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Full-Text Articles in Life Sciences
Determining The Role Of Human Plasma In Amyloid Fiber Synthesis, Carlee Renee Confer
Determining The Role Of Human Plasma In Amyloid Fiber Synthesis, Carlee Renee Confer
Theses and Dissertations
The presence of plaques and tangles in the human brain is a major feature observed in several neuropathological diseases including Parkinson’s and Alzheimer’s. Due to the high morbidity and mortality rates of such diseases, research on the characteristics and functions of these highly ordered structures aims to expand the understanding of how the presence of these plaques lead to cognitive decline. Many studies have led to the development of models that suggest that the presence of amyloid plaques and tangles within the brain induce a cytotoxic cycle that results in the suffocation and death of neurons within the brain. A …
Vegetation Response To Intense Holocene Dry Events In The Andes And Amazon Basin, Majoi De Novaes Nascimento
Vegetation Response To Intense Holocene Dry Events In The Andes And Amazon Basin, Majoi De Novaes Nascimento
Theses and Dissertations
By using the natural laboratory of past climate change I ask: How resilient are extant tropical forest ecosystems to climatic forcing? Do tropical forests systems show gradualistic or threshold responses to past climate change? How do climate forcings change floristic composition? And do humans amplify or suppress the effects of natural climate variability through land use? My study is set in western Amazonia and in the eastern flank of the Andes, regions renowned for high endemism and cultural importance. The time scale of the study spans the Mid-Holocene Dry Event (MHDE, c. 9000 to 4000 years ago), arguably the most …
Humans, Vegetation, And Drought In Late Holocene Amazonia, Christine Michelle Åkesson
Humans, Vegetation, And Drought In Late Holocene Amazonia, Christine Michelle Åkesson
Theses and Dissertations
The resilience and adaptation of past societies to climate change remain unclear, especially in the tropical cloud-forests of the Andes and the aseasonal forests of lowland western Amazonia. Long thought to have been too humid for significant human settlement, a new image of cloud-forests is emerging in which they supported human settlements for millennia. Anthropogenic disturbance, such as forest clearance, fire activity, and land-use has been suggested to have intensified during times of drier climates. Even so, the mid-elevational Andes and western Amazonia probably supported smaller pre-Columbian populations than settings with a distinct dry season. Uncertainties persist, however, regarding the …