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Kai Rebmann

The Effect Of Caffeine On Plant Growth | My Caffeine Addiction - 0 views

www.mycaffeineaddiction.com/ct-of-caffeine-on-plant-growth

shared by Kai Rebmann on 25 Apr 10 - Cached
  • There are many people who believe that the use of caffeine can
  • help plants to grow at a higher rate of speed.
  • On one side of the argument, there are those who feel that adding caffeine to a plant will help it to grow faster. This has been studied time after time, but at this point it is difficult to determine whether the caffeine is at work, or if the beneficial matter is something alongside such as potassium. In other words, caffeine may help in this area but it is hard to say if this is the case if this is not the only substance being used.
  • ...1 more annotation...
  • Once again, experiments consist of using pop or coffee in order to test the results. The issue with this is that other ingredients may also effect how the plant grows.
  • Kai Rebmann on 25 Apr 10
     
    arguments for and against the notion that caffeine helps plants grow
Matt Gillis

Different Types of Soil - 0 views

www.buzzle.com/...different-types-of-soil.html

biology soil plants

shared by Matt Gillis on 15 Apr 10 - Cached
  • Since soil is made up of such diverse materials like broken down rock particles and organic material, it can be classified into various types, though based on the size of the particles it contains.
    • Matt Gillis
      Matt Gillis on 15 Apr 10
       
      There are six major types of soil as shown here.
  • Soil Types
  • ...16 more annotations...
  • Sandy soil Silty soil Clay soil Loamy Soil Peaty Soil Chalky Soil
  • Sandy Soil- This type has the biggest particles and the size of the particles does determine the degree of aeration and drainage that the soil allows.
  • formed by the disintegration and weathering of rocks such as limestone, granite, quartz and shale
  • In a way sandy soil is good for plants since it lets the water go off so that it does not remain near the roots and lead them to decay.
  • the perfect soil
  • composed of minerals like Quartz and fine organic particles.
  • This type of soil can hold more moisture and at times becomes compact.
  • Clay Soil-Clay is a kind of material that occurs naturally and consists of very fine grained material with very less air spaces
  • it is difficult to work with since the drainage in this soil is low, most of the time there is a chance of water logging and harm to the roots of the plant
  • Loamy Soil- This soil consists of sand, silt and clay to some extent
  • Silty Soil-Silty soil is considered to be one of the most fertile of soils.
  • out of all the different kinds of soil loamy soil is the ideal for cultivation.
  • Peaty Soil- This kind of soil is basically formed by the accumulation of dead and decayed organic matter
  • Though the soil is rich in organic matter, nutrients present are fewer in this soil type than any other type
  • if the soil is fertilized well and the drainage of the soil is looked after, it can be the ideal for growing plants.
  • Chalky Soil-Unlike Peaty soil, Chalky soil is very alkaline in nature and consists of a large number of stones.
  • Matt Gillis on 15 Apr 10
     
    A description of six different, common types of soil and what varies between them.
Sarah Tolch

AccessScience | Research Update | Phototropin - 0 views

www.accessscience.com/content.aspx

shared by Sarah Tolch on 09 Apr 10 - Cached
  • Typically, stems show positive phototropism (movement toward the light), whereas roots exhibit negative phototropic movement (away from the source of light).
  • Arabidopsis contains two phototropins referred to as phot1 and phot2. Mutants of Arabidopsis lacking both phototropins lose their phototropic responsiveness
  • Phototropic response
  • ...10 more annotations...
  • phototropins control the movement of chloroplasts
  • these responses serve to enhance the photosynthetic
  • Phototropins, like photoreceptor pigments associated with mammalian vision, comprise many amino acids (900–1000) that form the main structure of the protein (the apoprotein) to which an accessory chemical cofactor is bound that can absorb light and impart color (the chromophore)
  • a small fraction of the receptor pool is rapidly internalized (within minutes) upon blue light irradiation
  • Phototropins are typically associated with the plasma membrane
  • However, the biological significance
  • As light passes through the stem, it becomes progressively diffracted, thereby generating a gradient of phototropin activation across the organ, with the highest level of activity occurring on the irradiated side
  • In some plant species, including the fern Adiantum capillus-veneris, phototropism and chloroplast movement are induced by red light as well as blue.
  • novel
  • The presence of such a hybrid photoreceptor is proposed to enhance light sensitivity and aid the prevalence of species such as ferns in low light conditions
Judi Crouch

Hypoxia in the Northern Gulf of Mexico - 2 views

www.gulfhypoxia.net/Overview

Crouch

shared by Judi Crouch on 12 Apr 10 - Cached
  • Hypoxia, or oxygen depletion, is an environmental phenomenon where the concentration of dissolved oxygen in the water column decreases to a level that can no longer support living aquatic organisms.
  • Hypoxic and anoxic (no oxygen) waters have existed throughout geologic time, but their occurrence in shallow coastal and estuarine areas appears to be increasing as a result of human activities (Diaz and Rosenberg, 1995). The largest hypoxic zone currently affecting the United States, and the second largest hypoxic zone worldwide, occurs in the northern Gulf of Mexico adjacent to the Mississippi River on the Louisiana/Texas continental shelf.
  • What causes hypoxia? Major events leading to the formation of hypoxia in the Gulf of Mexico include: Freshwater discharge and nutrient loading of the Mississippi River Nutrient-enhanced primary production, or eutrophication Decomposition of biomass by bacteria on the ocean floor Depletion of oxygen due to stratification
  • ...5 more annotations...
  • Mississippi River nutrient concentrations and loading to the adjacent continental shelf have greatly changed in the last half of the 20th century. During this time there has been a marked increase in the concentration of nitrogen and phosphorous in the Lower Mississippi River. This increase has been attributed to the increased use of nitrogen and phosphorous fertilizers,
  • Eutrophication
  • eutrophication initiates a massive growth of phytoplankton on the water’s surface.
  • This stratification leaves the bottom layer isolated from the surface layer and cut off from a normal resupply of oxygen from the atmosphere.
  • Hypoxia was first documented in the northern Gulf of Mexico off the Louisiana coast in 1972.
  • Judi Crouch on 12 Apr 10
     
    Good intro to the concept of "dead zones" (hypoxia)
  • Judi Crouch on 12 Apr 10
     
    This is a good introduction to the concept of a "dead zone."
  • Judi Crouch on 12 Apr 10
     
    What does anthropogenically mean?
bacoco coco

Essential Plant Nutrients - 1 views

www.cartage.org.lb/...EssentialPlant.htm

Plant nutrients

shared by bacoco coco on 09 Apr 10 - Cached
  • Essential plant nutrients: their relative amounts in plants, functions and classification
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      This table may be helpful in determining a topic for an experiment. You would only want to choose one nutrient with which to run an experiment.
  • Five types of deficiency or toxicity symptoms are observed:
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Here are the visible signs if the soil does not have enough of or too much of a nutrient.
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Plants can be damaged is there is too much of one nutrient (toxicity) or not enough of a nutrient (deficiency).
  • ...2 more annotations...
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Nutrients (in the soid) are needed either in large amounts (macronutrients), medium amounts (micronutrients), or in trace amounts
  • Table 2. Generalized Symptoms of Plant Nutrient Deficiency or Excess
Pascale Michelon

Plant hormone and growth regulators - 0 views

extension.oregonstate.edu/...hormones.html

plant hormones

shared by Pascale Michelon on 11 Apr 10 - Cached
  • (Table 5)
  • Hormones are produced naturally by plants, while plant growth regulators are applied to plants by humans
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      This is interesting because it shows you that if you want to manipulate hormones in an experiment you can use plant growth regulators to mimic the action of hormones.
  • ...3 more annotations...
  • There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA).
  • Ethylene is unique in that it is found only in the gaseous form. It
  • induces ripening, causes leaves to droop (epinasty) and drop (abscission), and promotes senescence.
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      The effects of ethylene (promotion of both aging/death and ripening) may explain why just one bad apple in a basket may spoil the whole bunch.
  • Pascale Michelon on 11 Apr 10
     
    Plant hormones and growth regulators are chemicals that affect flowering; aging; root growth; killing of leaves; prevention or promotion of stem elongation; color enhancement of fruit; prevention of leafing and/or leaf fall; etc.
Laura Bradford

AccessScience | Encyclopedia Article | Soil fertility - 1 views

www.accessscience.com/content.aspx

l bradford

shared by Laura Bradford on 09 Apr 10 - Cached
  • Sixteen chemical elements are required for the growth of all plants: carbon, oxygen, and hydrogen (these three are obtained from carbon dioxide and water), plus nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, zinc, copper, boron, molybdenum, and chlorine. Some plant species also require one or more of the elements cobalt, sodium, vanadium, and silicon.
  • 13 essential mineral nutrien
  • J. R. Brown (ed.), Recommended Chemical Soil Test Procedures for the North Central Region, Missouri Agricultural Experiment Station, Columbia, 1998
  • Laura Bradford on 09 Apr 10
     
    Soil Fertility: How is this important to growth of a plant?
  • Laura Bradford on 09 Apr 10
     
    Note the Bibliography. I've highlighted an article, available as a pdf file, with information on interesting experimental procedures for how to handle and test soil. Might be helpful for your experimental design.
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