This time we will not talk about the microbial succession, but some more important
features such as environment.
They contain few antibiotic resins
P and N concentration are quite high
C:N ratio is 30-60 (low)
Energy refers to the capacity to move or change matter.
Forms of Energy
These forms of energy are important to life:
Energy can be transformed from one form to another.
Chemical energy is the ener
The 4 Phases of Microbial Population
1. Lag phase
This is the time needed to switch on the necessary cell machinery to (a).
transport the substrate into the cell, and (b), process the substrate once inside. It
normally requires the de novo synthesi
Decomposition of Conifer Needles
Generally the substrate quality is poor for the following reasons
The substrate is dry needles with waxy cuticles
The waxy cuticle covers the stomata to prevent fungal spores getting in
They contain antibiotic re
Epidemiology is the study of the occurrence, distribution, and control of disease in
Epidemiologists are interested in the life history of pathogens. What it does to the host,
the spread of diseases, where did it start and what is its mode of
Inanimate objects such as toys, books, bedding are transmit disease. These objects are
Epidemics (See figure 22.5) can be divided into common-source epidemicsand hosthost epidemics. In common source epidemics a large number of individuals
Integration of DNA into host chromosome - lambda integrates at a specific site in the
chromsome. Once integrated, only the lambda repressor is made to repress lambda's
genes. Also, lambda repressor is responsible for preventing a second virus from
Organisms which grow extremely rapidly when a new substrate arrives
The are 'boom' and 'bust' (i.e. big fluctuations in pop'n numbers)
They are not long lived
They spend most of their time in hibernation (waiting for substrate)
They are more ad
Ecology is the study of the relationships between organisms and their environment.
Soil population ecology:
is the interaction between the following 3:
1. Organisms (microbes, plants and animals)
2. Substrates (dead roots, leaves, dead organisms, pesticid
Populations are more dense than 1800's therefore disease spreads more easily.
Sexual promiscuity, intravenous drugs use
Technology and industry advances
Includes advances in medicine and hospitals where we have explosive