7.5.2 Dibutyl Phthalate
Dibutyl phthalate is an organic compound, which is widely used as an additive in
adhesives, print inks, and plasticizers. With the oily liquid, which has a sweet smell,
alcohol, ether, and benzene are used as organic solvents. Whether this compound
causes disturbance to the internal secretion of hormones is doubted. The effect of
Dibutyl phthalate was investigated by Dr. Sugiura and added to the microcosm at the
start of cultivation (day 0), and the populations of microorganisms and the amounts
of respiration and production were tracked continuously. The m-NOEC of Dibutyl
phthalate was estimated to be 1 mg/L (Sugiura 1992).
7.6 Antibiotics
Antibiotics, also called antibacterials, are a type of antimicrobial drug used in the
treatment and prevention of bacterial infections. They may either kill or inhibit the
growth of bacteria. A limited number of antibiotics also possess antiprotozoal
capabilities. Antibiotics are not effective against viruses, such as the common cold
or influenza; drugs that inhibit viruses are termed “antiviral drugs” or “antivirals,”
Respiration(mg O 2 /L)
Production(mg O
2 /L)
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
control
0.1 mg/L
1 mg/L
0.2 mg/L
Fig. 7.21 Time course of P/R ratio in Nonylphenol-added microcosm N-system
7 Example Assessments of the Microcosm N-System
105
Dibutyl phthalate is an organic compound, which is widely used as an additive in
adhesives, print inks, and plasticizers. With the oily liquid, which has a sweet smell,
alcohol, ether, and benzene are used as organic solvents. Whether this compound
causes disturbance to the internal secretion of hormones is doubted. The effect of
Dibutyl phthalate was investigated by Dr. Sugiura and added to the microcosm at the
start of cultivation (day 0), and the populations of microorganisms and the amounts
of respiration and production were tracked continuously. The m-NOEC of Dibutyl
phthalate was estimated to be 1 mg/L (Sugiura 1992).
7.6 Antibiotics
Antibiotics, also called antibacterials, are a type of antimicrobial drug used in the
treatment and prevention of bacterial infections. They may either kill or inhibit the
growth of bacteria. A limited number of antibiotics also possess antiprotozoal
capabilities. Antibiotics are not effective against viruses, such as the common cold
or influenza; drugs that inhibit viruses are termed “antiviral drugs” or “antivirals,”
Respiration(mg O 2 /L)
Production(mg O
2 /L)
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
9
6
3
0
control
0.1 mg/L
1 mg/L
0.2 mg/L
Fig. 7.21 Time course of P/R ratio in Nonylphenol-added microcosm N-system
7 Example Assessments of the Microcosm N-System
105