scholarly journals Toxicity of environmentally important micropollutants on three trophic levels

2022 ◽  
Vol 5 (1) ◽  
pp. 20-28
Author(s):  
Hilal Yılmaz ◽  
Gülsen Avaz ◽  
Ülkü Yetiş ◽  
Melek Özkan
Keyword(s):  
Danio Rerio ◽  
Aquatic Ecosystems ◽  
Phaeodactylum Tricornutum ◽  
Marine Algae ◽  
Environmental Problem ◽  
Trophic Levels ◽  
Toxic Chemical ◽  
Chemical Substances ◽  
Toxic Chemical Substances ◽  
Higher Sensitivity

Micropollution is a serious environmental problem caused by continuous entry of trace quantities of toxic chemical substances into the aquatic environment. In the present study, three trophic levels of the aquatic ecosystems were used to evaluate the acute toxicities of environmentally important micropollutants including heavy metals, pesticides and drugs. There is a scarcity of information on toxicity of the studied substances on marine water algae. Among studied micropollutants, the most toxic chemical to Daphnia magna and Danio rerio was found to be 1-Chloro-2,4 dinitrobenzene with EC50 of 0.002 and 4.2 mg/L, respectively. Although this compound was also toxic to marine algae, Phaeodactylum tricornutum, arsenic showed the highest toxicity to the algae with EC50 of 2.4 mg/L. As compared to other organisms, D. magna was found to have higher sensitivity to all of the tested micropollutants.

scholarly journals KADAR SENYAWA TOKSIK DALAM DARAH IKAN NILA (Oreochromis niloticus) SAAT MUSIM UP-WELLING DI DANAU MANINJAU, SUMATRA BARAT

2020 ◽  
Vol 38 (1) ◽  
pp. 25
Author(s):  
Silvi Susanti
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Common Species ◽  
Toxic Chemical ◽  
Chemical Substances ◽  
Nile Tilapia Oreochromis Niloticus ◽  
West Sumatra ◽  
Phosphate Nitrate ◽  
Net Cages ◽  
Toxic Chemical Substances

Maninjau lake is the largest center for the freshwater floating-net-cage fisheries system in West Sumatra. Every year, during the up-welling season, a huge number of fish suffered to death in the lake including nile tilapia (Oreochromis niloticus), a common species cultivated in the floating-net cages. This current study aimed to determine the factors contributing to the death of fish by measuring the concentration of toxic chemical substances in the blood plasm of nile tilapia as well as in the subtrate collected from the bottom of the lake. The samples were collected in the sites with higher number of floating-net cages as well as higher number of mass death of fish (Tanjung Sani, Pakan Raba’a dan Maninjau) during the up-welling season. The result revealed that the levels of phosphate, nitrate, nitrit, and amonium were higher in the blood plasm of the fish. Moreover, the levels of those chemical substances were also higher in the substrate of the lake. The higher concentration of the toxic chemical substances might contribute to the mass death of fish living in the floating-net cages during the up-welling season.

Chemometrics in Medicine and Pharmacy

2012 ◽  
Vol 11 (1) ◽  
pp. 11-26 ◽  
Author(s):  
Ján Mocák
Keyword(s):  
Drug Design ◽  
Clinical Diagnosis ◽  
Active Species ◽  
Biologically Active ◽  
Toxic Chemical ◽  
Chemical Substances ◽  
Effective Use ◽  
The University ◽  
Toxic Chemical Substances

Chemometrics in Medicine and PharmacyThis minireview summarizes the basic ways of application of chemometrics in medicine and pharmacy. It brings a collection of applications of chemometric used for the solution of diverse practical problems, e.g. exploitation of biologically active species, effective use of biomarkers, advancement of clinical diagnosis, monitoring of the patient's state and prediction of its perspectives, drug design or classification of toxic chemical substances. The aim of this contribution is a brief presentation of versatile potentialities of contemporary chemometrical techniques and relevant software. They are exemplified by typical cases from literature as well as by own research results of the Chemometrics group at Department of Chemistry, the University of Ss. Cyril & Methodius in Trnava.

scholarly journals Epithelioid Angiosarcoma of the Small Intestine After Occupational Exposure to Radiation and Polyvinyl Chloride: A case Report and Review of Literature

Sarcoma ◽  
2005 ◽  
Vol 9 (3-4) ◽  
pp. 161-164 ◽  
Author(s):  
Maged F. Khalil ◽  
Asha Thomas ◽  
Adel Aassad ◽  
Moshe Rubin ◽  
Robert N. Taub
Keyword(s):  
Soft Tissue Sarcomas ◽  
External Beam Radiation Therapy ◽  
External Beam Radiation ◽  
Review Of Literature ◽  
Toxic Chemical ◽  
Internal Organs ◽  
Epithelioid Angiosarcoma ◽  
Beam Radiation ◽  
Chemical Substances ◽  
Toxic Chemical Substances

Angiosarcomas represent 1–2% of soft tissue sarcomas and most frequently occur in the subcutis. They may affect internal organs, such as the heart, liver, and spleen, and only rarely do they emerge in the gastrointestinal tract. The association between angiosarcomas and certain toxic chemical substances or previous external-beam radiation therapy is well documented.

Ecologically Safe Technology for Bioremediation of Soils Polluted by Toxic Chemical Substances

2002 ◽  
pp. 181-186 ◽  
Author(s):  
G. A. Zharikov ◽  
V. I. Varenik ◽  
R. V. Borovick ◽  
N. R. Dyadischev ◽  
V. V. Kapranov ◽  
...  
Keyword(s):  
Toxic Chemical ◽  
Chemical Substances ◽  
Safe Technology ◽  
Toxic Chemical Substances

ARE BIRDS ABLE TO TASTE AND REJECT BUTTERFLIES BASED ON 'BEAK MARK TASTING'? A DIFFERENT POINT OF VIEW

Behaviour ◽  
1999 ◽  
Vol 136 (8) ◽  
pp. 965-981 ◽  
Author(s):  
Luka Kassarov
Keyword(s):  
Chemical Defense ◽  
Chemical Compound ◽  
Taste Buds ◽  
Point Of View ◽  
Toxic Chemical ◽  
Color Patterns ◽  
Chemical Substances ◽  
Toxic Chemical Substances ◽  
Active Escape

AbstractIt is widely accepted that birds are able to taste toxic chemical substances in the wings of a butterfly by grabbing or pecking a small piece of the wing without disrupting the integrity of the integument ('beak mark tasting'). If found toxic, the bird will release the insect unharmed. This supposition has been used to explain some aspects of the interrelationship between birds as predators and butterflies as prey, especially the role of birds in the evolution of butterfly color patterns. It also is used to support the theory of aposematisc coloration, especially in butterflies. On the basis of the anatomy of the avian gustatory apparatus, the distribution of the taste buds in the beak cavity, and the physiology of taste, this author considers this supposition a misconception. The frequent beak marks seen on the wings of aposematic butterflies are not considered to be a proof of taste rejection by birds after contact with the chemical compound(s) supposed to provide the insect with a chemical defense, but a sign of active escape of the butterfly from its captor. Some aspects of the interrelationship between birds and butterflies, considered to be well explained on the basis of taste rejection of butterflies via 'beak mark tasting' by the birds, are critically discussed in this paper.

TOXIC CHEMICAL SUBSTANCES USED IN AGRICULTURE

The Lancet ◽  
1952 ◽  
Vol 259 (6701) ◽  
pp. 262-263 ◽  
Author(s):  
P LESLEYBIDSTRUP
Keyword(s):  
Toxic Chemical ◽  
Chemical Substances ◽  
Toxic Chemical Substances
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