The Toxic Action of Copper and Mercury Salts Both Separately and When Mixed on the Harpacticid Copepod, Nitocra Spinipes (Boeck)

1948 ◽  
Vol 25 (3) ◽  
pp. 270-275
Author(s):  
H. BARNES ◽  
F. A. STANBURY
Keyword(s):  
Sea Water ◽  
The State ◽  
Toxic Action ◽  
Chemical Data ◽  
Physico Chemical ◽  
Mercury Salts

1. The results are given of the poisoning of Nitocra spinipes (Boeck) by copper and mercury salts used together and separately. 2. The state of copper and mercuric salts in sea water is examined using the available physico-chemical data. 3. The results suggest that the two poisons act in a different manner and possible reasons for this are considered. 4. The striking synergic effects obtained when the two metals are used together are considered to support the suggestion in 3 above and various possible explanations, both biological and chemical for this synergism, are examined.

scholarly journals Tank study of physico-chemical controls on gas content and composition during growth of young sea ice

2002 ◽  
Vol 48 (161) ◽  
pp. 177-191 ◽  
Author(s):  
Jean-Louis Tison ◽  
Christian Haas ◽  
Marcia M. Gowing ◽  
Suzanne Sleewaegen ◽  
Alain Bernard
Keyword(s):  
Sea Ice ◽  
Sea Water ◽  
Bubble Nucleation ◽  
Water Dynamics ◽  
Gas Content ◽  
First Year ◽  
Water Interface ◽  
Atmospheric Gases ◽  
Physico Chemical ◽  
Ice Water

AbstractDuring an ice-tank experiment, samples were taken to study the processes of acquisition and alteration of the gas properties in young first-year sea ice during a complete growth–warming–cooling cycle. The goal was to obtain reference levels for total gas content and concentrations of atmospheric gases (O2, N2, CO2) in the absence of significant biological activity. The range of total gas-content values obtained (3.5–18 mL STP kg−1) was similar to previous measurements or estimates. However, major differences occurred between current and quiet basins, showing the role of the water dynamics at the ice–water interface in controlling bubble nucleation processes. Extremely high CO2concentrations were observed in all the experiments (up to 57% in volume parts). It is argued that these could have resulted from two unexpected biases in the experimental settings. Concentrations in bubbles nucleated at the interface are controlled by diffusion both from the ice–water interface towards the well-mixed reservoir and between the interface water and the bubble itself. This double kinetic effect results in a transition of the gas composition in the bubbles from values close to solubility in sea water toward values close to atmospheric, as the ice cover builds up.

Statistical analysis of the physico–chemical data on the coastal waters of Cochin

2003 ◽  
Vol 5 (2) ◽  
pp. 324-327 ◽  
Author(s):  
C. S. Padmanabha Iyer ◽  
Manonmani Sindhu ◽  
Savita G. Kulkarni ◽  
Sanjeev S. Tambe ◽  
Bhaskar D. Kulkarni
Keyword(s):  
Statistical Analysis ◽  
Coastal Waters ◽  
Chemical Data ◽  
Physico Chemical

Elevated sea-water temperature and solar UV-B flux associated with two successive coral mass bleaching events in Tahiti

1995 ◽  
Vol 46 (8) ◽  
pp. 1153 ◽  
Author(s):  
JH Drollet ◽  
M Faucon ◽  
PMV Martin
Keyword(s):  
Water Temperature ◽  
Coral Bleaching ◽  
Sea Water ◽  
Bleaching Event ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Long Line ◽  
Solar Uv ◽  
Line Transects ◽  
A Minor

After a minor coral bleaching event in 1993, a more dramatic episode occurred in Tahiti from March to July 1994. Coral bleaching was recorded along four continuous 25-m-long line transects. Physico-chemical parameters of the sea water (temperature, salinity, dissolved oxygen and pH) were noted once a week, and solar UV-B flux was recorded daily before and during the bleaching episode. Results emphasized the importance of the taxonomic position of coral in susceptibility to bleaching. The evolution of bleaching through time was related to mean daily solar UV-B flux and sea-water temperature. Moreover, comparison of the 1993 and 1994 data suggested temperature and/or UV-B thresholds that may elicit minor or severe bleaching events.

The physico-chemical data base

2007 ◽  
pp. 271-287 ◽  
Author(s):  
P. Buurman ◽  
F. Bartoli ◽  
A. Basile ◽  
G. Füleky ◽  
E. Garcia Rodeja ◽  
...  
Keyword(s):  
Data Base ◽  
Chemical Data ◽  
Physico Chemical

Zinc concentrations in juvenile flatfish

1979 ◽  
Vol 59 (3) ◽  
pp. 761-775 ◽  
Author(s):  
N. J. Milner
Keyword(s):  
Sea Water ◽  
Chemical Properties ◽  
Estuarine Fish ◽  
Physico Chemical ◽  
Zinc Cadmium ◽  
Iron And Zinc ◽  
Lead Levels ◽  
Zinc Concentrations ◽  
High Concentrations ◽  
Cadmium And Lead

In most demersal and some pelagic marine fish O- and I-group stages are found on inshore nursery grounds which are often situated in coastal indentations and estuarieswhere flushing rates are low and the build up of persistent pollutants can be correspondingly high. Their movements are restricted, only leaving the nursery areas towards the end of their second year (Lockwood, 1974; Riley, 1973). This, coupled with the fact that juveniles may be more susceptible than adults to pollutants, makes them particularly vulnerable to the potential hazards of inshore pollution.The physico-chemical properties of most trace metals, however, generally preclude their occurrence at high concentrations in sea water itself. Instead, most of the metal is transferred to the particulate phase of the water mass and to sedimentary reservoirs (Renfro, 1973) so that concentrations of metals in sea water very rarely reach levels which are known to be acutely toxic to fish. The main risk from direct effects of metals lies in poisoning resulting from internal accumulation.Little information is available on metal concentrations occurring in young fish. Hardisty et al. (1974) and Hardisty, Kartar & Sainsbury (1974) have examined zinc, cadmium and lead levels in O-group and older flounders from the Bristol Channel. Andersen, Dommasnes & Hesthagen (1973) found high concentrations of zinc in O- and I-group herring and sprat from Oslo Fjord, Cross & Brooks (1973) reported on manganese, iron and zinc concentrations in juvenile estuarine fish. Pentreath (1973 b) has reported on zinc concentrations in the organs of I-group plaice.

Notizen: Marginalin, a Substance from the Pygidial Glands of Dytiscus Marginalis (Coleoptera): Molecular Associations with Polyamines in vitro

1990 ◽  
Vol 45 (10) ◽  
pp. 1455-1456 ◽  
Author(s):  
Michel Barbier
Keyword(s):  
Defensive Secretion ◽  
Biological Properties ◽  
Chemical Data ◽  
Pygidial Glands ◽  
Molecular Associations ◽  
Water Beetle ◽  
Physico Chemical ◽  
Biological Interest

Marginalin, a product previously isolated from the pygidial glands of the water-beetle Dytiscus marginalis (Coleoptera), strongly reacts in vitro to form complexes with polyamines of biological interest. With spermin and spermidin, this interaction is specific giving 1:1 complexes which were isolated and studied (physico-chemical data). The results so far observed are discussed in relationship with the known biological properties of spermin and spermidin and the significance of marginalin in the defensive secretion of the beetle

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