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chase halbeck

Gender-Specific Differences Found In Human Brain - 0 views

www.sciencedaily.com/...990422061106.htm

gender brain project

shared by chase halbeck on 16 Sep 09 - Cached
  • Men and women's brains are distinctly different. While men have more neurons in the cerebral cortex, the brain's outer layer, women have more neuropil, which contains the processes allowing cell communication. Research showing these gender-specific differences was presented during the American Academy of Neurology 51st Annual Meeting April 17 -- 24, 1999, in Toronto.
  • The cerebral cortex is responsible for voluntary movements, perception of sensory input and of highly complex functions such as memory, learning, reasoning and language,"
  • Males possess more tightly packed and more numerous nerve cells (neurons) than females. Neurons send and receive electrical signals that influence many functions of the body and create thoughts and feelings. Females tend to have more neuropil, the fibular tissue that fills the space between nerve cell bodies and contains mainly nerve cell processes (synapses, dendrites and axons) that enable neurons to communicate with numerous other nerve cells."
  • ...3 more annotations...
  • This research may explain previous findings that women are more prone to dementing illnesses than are men. Although a man and woman may lose the same number of neurons due to a disease, such as dementia, the woman's functional loss may be greater because the cells lost are more densely connected with other neurons. Added de Courten-Myers, "Conversely, in males, the 'functional reserve' may be greater as a larger number of nerve cells are present, which could prevent some of the functional losses."
  • Although these gender-specific variations cause tangible differences in how the brain functions, one type is not "better" or "worse" than the other
  • t seems reasonable to assume that specific functions may benefit from the presence of more cells while others may be enhanced by a larger number of connections between them. A better understanding of these issues may potentially affect a wide spectrum of human activities such as health care, psychology and teaching." The researchers measured the cortex thickness and counted nerve cells from various sites within the healthy brains of 17 deceased subjects (10 males and seven females).
  • chase halbeck on 16 Sep 09
     
    good site explains a lot of good detailed differences
Hayley Landman

Hydroponic Gardens | Plant roots, stems, and leaves - 1 views

www.hydroempire.com/...hydroponic-plant-parts.php

bio project

shared by Hayley Landman on 15 Apr 10 - Cached
  • the health of a plant can be easily seen in them. Leaves do not repair themselves, so the life of a plant can be read by its leaves
    • Hayley Landman
      Hayley Landman on 15 Apr 10
       
      A way to determine results?
  • Roots send nutrients (in exchange for sugar) up through leaf stems to the leaves for final processing. They are also large storage sites for excess energy from the leaves, which is stored as starch. The roots and their capacity to store starch will decide how well a plant will grow and how much the plant will yield.
  • Hayley Landman on 15 Apr 10
     
    possible site for research base
julia olson

Soil Types and Testing - 0 views

www.rain.org/...soil-types-and-testing.htm

project

shared by julia olson on 14 Apr 10 - Cached
  • Soil can be described in many different ways, such as heavy, light, sandy, clay, loam, poor or good.
  • Although each of these factors is important, three factors (texture, organic content and pH) are more important than the others.
  • To be healthy, a soil needs to be able to breath and water needs to be able to move through it reasonably easily.
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  • Sand doesn't hold many nutrients or water
  • Silt is a soil particle whose size is between sand and clay.
  • Soils high in clay content are called heavy soils.
  • Most of the water in a clay soil is so tightly bound to the clay particles that plants can't get it loose.
  • The amount if moisture found in soil varies greatly with the type of soil, climate and the amount of humus (organic material) in that soil.
  • The organic content of soil greatly influences the plant, animal and microorganism populations in that soil.
  • rainwater (if its not polluted) has a normal pH of about 6 - 6.5, which is slightly acidic.
  • It should then come as no surprise that most plants grow their best at around the same pH*.
  • Soil structure tells how the soil affects the movement of water, air and root penetration into the soil.
  • Soil temperature has a significant role in helping to determine the rate of plant growth, and whether a plant will even survive.
  • Sandy soil absorbs more than two inches of water per hour. It is very porous, with large spaces between soil particles.
  • Loam soil absorbs from .25 inches to 2 inches per hour.
  • Clay soil absorbs less than .25 inches of water per hour.
  • Sandy soil Loam soil, and Clay soil
  • It is a combination of sand and clay particles.
  • julia olson on 14 Apr 10
     
    plant soil
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