By David Harrison Ph.D. (auth.)
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I ' I ..... ' 1 1 1 _____:1 50'/o normal mesophytic habitats (excluding saturated, high evaporation systems like swampy everglades and rain forests), the water vapour pressure difference across the stoma pore is increased, thus diffusion proceeds faster. 8 at 20°C. rel. humidity vap. pressure at 30°C. rel. humidity vap. 5 vaeour pressure difference = 24-8 54 These factors are those peculiar to leaf tissues. Stomatal opening. 95% of water loss from leaves takes place from the lower epidermis, mainly via stomata.
After 48 hours (other species of Plasmodium have different and characteristic periods) the red cell bursts, liberating more parasites and toxins (causing fever symptoms) into the blood stream to invade other red blood cells. This cycle is continuous. Some days later, during which the fever bouts increase in severity, schizonts develop into the female macrogametocytes and the male microgametocytes and remain in the blood until they are taken into the stomach of the mosquito. Stages in mosquito If a mosquito takes a feed of blood containing gametocytes gametes are formed in the stomach and fertilisation takes place there.
They do not respond to antibiotics, as do pathogenic bacteria. ORIGIN OF VIRUSES It is in doubt, but might be one of the following: 1. e. detached portions of chromosome nucleoprotein, or of plasmagenes, which would account for their specificity to particular types of cell into which their nucleoprotein pattern fits. It is now thought likely that some viruses can cause certain types of cancer, in which case viral invasion becomes analogous to a mutation of host cell genes. 2. Degenerate bacteria or rickettsiae.
Advanced Biology Notes by David Harrison Ph.D. (auth.)