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17) Meanwhile, a significant dose-dependent increase was observed in HSI, indicating the activation of hepatic VTG production in 4-NP- and E2-injected fish.
* Induction of vitellogenin synthesis in immature male yellowfin seabream (Acanthopagrus latus) exposed to 4-nonylphenol and 17β-estradiol.
- In the present study, the effects of xenoestrogen 4-nonylphenol (4-NP) and 17β-estradiol (E2) on the synthesis of vitellogenin (VTG) in immature male yellowfin seabream (Acanthoparus latus) were assessed to determine the potential use of this species as a biological model for studying endocrine disrupters in the Musa estuary in southern seawaters of Iran. A total number of 104 fish were injected by 10, 50, 100, 150 and 200 µg g(-) (1) week(-) (1) of 4-NP and 2 µg g(-) (1) week(-) (1) of E2, and their blood plasma was obtained for biochemical analysis on days 0, 7 and 14. The hepatosomatic index (HSI) of each fish was also recorded at each sampling time. The results showed that 4-NP significantly induced VTG synthesis in A. latus, which was detected by gel electrophoresis as two major protein bands (∼210 and 191 KDa). The induction of VTG was also determined indirectly by measuring the alkali-labile phosphate, total plasma calcium and protein. All of these VTG indicators significantly increased in the plasma of 4-NP- and E2-treated fish. Meanwhile, a significant dose-dependent increase was observed in HSI, indicating the activation of hepatic VTG production in 4-NP- and E2-injected fish. Furthermore, the plasma alanine aminotransferase and aspartate aminotransferase concentrations significantly increased in 4-NP-treated fish, presumably reflecting a situation of hepatic tissue damage due to 4-NP toxicity. Based on the results, it is suggested that A. latus could be used successfully as a model species for future studies of endocrine disrupting contaminants in the Musa estuary.
Overview of verb observe
The verb observe has 9 senses (first 8 from tagged texts)
1. (39) detect, observe, find, discover, notice -- (discover or determine the existence, presence,
or fact of; "She detected high levels of lead in her drinking water"; "We found traces of lead in
the paint")
2. (17) note, observe, mention, remark -- (make mention of; "She observed that his presentation took
up too much time"; "They noted that it was a fine day to go sailing")
3. (12) note, take note, observe -- (observe with care or pay close attention to; "Take note of this
chemical reaction")
4. (10) observe -- (watch attentively; "Please observe the reaction of these two chemicals")
5. (4) respect, honor, honour, abide by, observe -- (show respect towards; "honor your parents!")
6. (3) observe, celebrate, keep -- (behave as expected during of holidays or rites; "Keep the
commandments"; "celebrate Christmas"; "Observe Yom Kippur")
7. (2) watch, observe, follow, watch over, keep an eye on -- (follow with the eyes or the mind;
"Keep an eye on the baby, please!"; "The world is watching Sarajevo"; "She followed the men with the
binoculars")
8. (1) observe, keep, maintain -- (stick to correctly or closely; "The pianist kept time with the
metronome"; "keep count"; "I cannot keep track of all my employees")
9. observe, keep -- (conform one's action or practice to; "keep appointments"; "she never keeps her
promises"; "We kept to the original conditions of the contract")
Overview of adj observed
The adj observed has 1 sense (first 1 from tagged texts)
1. (7) ascertained, discovered, observed -- (discovered or determined by scientific observation;
"variation in the ascertained flux depends on a number of factors"; "the discovered behavior norms";
"discovered differences in achievement"; "no explanation for the observed phenomena")
--- WordNet end ---