Effects of Copper on Gammarus pseudolimnaeus, Physa integra, and Campeloma decisum in Soft Water

1970 ◽  
Vol 27 (7) ◽  
pp. 1277-1283 ◽  
Author(s):  
John W. Arthur ◽  
Edward N. Leonard
Keyword(s):  
Continuous Flow ◽  
Copper Concentration ◽  
Adult Stage ◽  
Water System ◽  
Soft Water ◽  
Tolerance Limits ◽  
Invertebrate Species ◽  
Total Copper ◽  
Gammarus Pseudolimnaeus

Three invertebrate species were subjected to acute (96-hr), followed by long-term (6-week) copper exposures under continuous-flow bioassay conditions. Survival, growth, reproduction, and feeding were the responses used for measuring toxicant effects. The average 96-hr median tolerance limits (TLm) values for Campeloma decisum, Physa integra, and Gammarus pseudolimnaeus were 1.7, 0.039, and 0.020 mg/liter total copper, respectively. The total copper concentration having no effect after 6 weeks exposure for all three species was between 8.0 and 14.8 μg/liter. The newly hatched amphipods obtained from the second 6-week study were exposed to copper for 9 additional weeks, and grew to the adult stage only in copper concentrations ≤ 4.6 μg/liter. After 5 weeks exposure to a water system, survival of newly hatched Gammarus was markedly reduced when copper concentrations were between 12.9 and 6.2 μg/liter.

The detection of heightened sea-water copper concentrations by the mussel Mytilus edulis

1978 ◽  
Vol 58 (4) ◽  
pp. 843-850 ◽  
Author(s):  
John Davenport ◽  
Andrew Manley
Keyword(s):  
Acute Toxicity ◽  
Mytilus Edulis ◽  
Copper Concentration ◽  
Sea Water ◽  
Water System ◽  
Valve Closure ◽  
Toxicity Threshold ◽  
Total Copper ◽  
Closure Mechanism ◽  
Behavioural Reaction

An acute toxicity threshold of 0·09–0·10 ppm added copper was determined for specimens of Mytilus edulis from the Menai Strait which were exposed to copper (as CuSO4) in a flowing sea-water system.Results are presented which show that the closure response of the mussel to added copper is a three-part process. First, a sharp adduction of the shell valves is seen at a mean total copper concentration of only 0·021 ppm, then as the copper concentration rises, ‘testing’ behaviour is observed and finally the shell valves close to isolate the animal from its environment. The complete valve closure mechanism only operates at added copper concentrations of 0·2 ppm or more. The initial behavioural reaction of valve adduction at low concentration occurred at a significantly higher mean total copper concentration (0·16 ppm) in mussels which had been previously acclimated to 0·02 ppm total copper in sea water for 10 days.

Feasibility of Long Term Use of External Continuous Flow Ventricular Assist Device

2015 ◽  
Vol 34 (4) ◽  
pp. S84-S85
Author(s):  
B. Li ◽  
L. Truby ◽  
K. Fujita ◽  
S. Ikeda ◽  
S. Fukuhara ◽  
...  
Keyword(s):  
Ventricular Assist Device ◽  
Continuous Flow ◽  
Assist Device ◽  
Ventricular Assist

PATHOLOGICAL SEQUELAE OF LONG-TERM HEART ASSIST WITH CONTINUOUS FLOW LEFT VENTRICULAR ASSIST IN CALVES

ASAIO Journal ◽  
2001 ◽  
Vol 47 (2) ◽  
pp. 111
Author(s):  
S Kihara ◽  
K Yamazaki ◽  
K Litwak ◽  
P Litwak ◽  
O Tagusari ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Left Ventricular ◽  
Ventricular Assist ◽  
Left Ventricular Assist

Direct Measurement of Basal Water Pressures: a Pilot Study

1976 ◽  
Vol 16 (74) ◽  
pp. 205-218 ◽  
Author(s):  
Steven M. Hodge
Keyword(s):  
Pilot Study ◽  
Direct Measurement ◽  
Water Pressure ◽  
Water System ◽  
Water Levels ◽  
Hole Drilling ◽  
Glacier Surface ◽  
Term Trend ◽  
Long Term Trend

AbstractBore-hole drilling techniques have been used to connect with the subglacial water system of the temperate South Cascade Glacier. The water level in a connecting bore hole probably represents a direct measurement of the basal water pressure over an area at least to m in extent. Fluctuations of up to 40 m in bore-hole water levels occur typically over periods of several days and often peak about 2 d after large changes in water input at the glacier surface. The long-term trend in bore-hole water levels supports the idea of seasonal storage and release of liquid water.

scholarly journals Long-Term Continuous-Flow Biventricular Support in a 63-Year-Old Woman

2018 ◽  
Vol 45 (2) ◽  
pp. 110-112
Author(s):  
Andrew C.W. Baldwin ◽  
William E. Cohn ◽  
Jeffrey A. Morgan ◽  
O.H. Frazier
Keyword(s):  
Continuous Flow ◽  
Older Patients ◽  
Mechanical Circulatory Support ◽  
Circulatory Support ◽  
Orthotopic Heart Transplantation ◽  
Nonischemic Cardiomyopathy ◽  
Bridge To Transplantation ◽  
Similar Patient ◽  
Ventricular Support

We describe the successful use of long-term biventricular continuous-flow mechanical circulatory support as a bridge to transplantation in a small-framed 63-year-old woman with long-standing nonischemic cardiomyopathy. After placement of a left-sided HeartWare HVAD, persistent right-sided heart failure necessitated implantation of a second HeartWare device for long-term right ventricular support. After 262 days, the patient underwent successful orthotopic heart transplantation and was discharged from the hospital. This report indicates the feasibility of biventricular device support in older patients of relatively small stature, and our results may encourage others to consider this therapy in similar patient populations.

Sign in / Sign up

Export Citation Format

Share Document