BIOAVAILABILITY OF PETROLEUM HYDROCARBONS FROM WATER, SEDIMENTS, AND DETRITUS TO THE MARINE ANNELID, NEANTHES ARENACEODENTATA

1977 ◽  
Vol 1977 (1) ◽  
pp. 621-625 ◽  
Author(s):  
Steven S. Rossi
Keyword(s):  
Petroleum Hydrocarbons ◽  
Water Soluble ◽  
Fuel Oil ◽  
Magnification Factor ◽  
Short Term ◽  
Tissue Concentrations ◽  
Short Term Exposure ◽  
Oil Water ◽  
Sediment Particles ◽  
Marine Worms

ABSTRACT Uptake, retention, metabolism, and depuration of diaromatic hydrocarbons by the polychaete, Neanthes arenaceodentata, were examined in experiments utilizing seawater solutions and sediments contaminated with either No. 2 fuel oil water-soluble fractions or radio-labelled naphthalenes. Polychaetes rapidly accumulate 14C-naphthalene (magnification factor = 40X) from solution during short-term exposure (24 hr). Worms slowly released hydrocarbons accumulated during acute exposure down to undetectable levels (<0.05 ppm) within 300 hours after return to clean seawater. 14C-naphthalene accumulated from solution was metabolized by polychaetes, and associated microflora apparently play no role in uptake, release, or metabolism. Analyses of worms held for 28 days in clay-silt sediments artificially contaminated with No. 2 fuel oil (9 μg total naphthalenes/g wet sediment) indicate that naphthalenes were not accumulated by worms at tissue concentrations above 0.1 ppm. Polychaetes likewise failed to accumulate 14C-methylnaphthalene from ingestion of contaminated detritus (10-15 μg 14C-methylnaphthalene/g dry detritus) for 16 consecutive days. These data suggest that petroleum hydrocarbons bound to sediment particles or particulate organic matter are less available to marine worms than those in solution.

Determination of Bismuth in Body Tissues and Fluids After Administration of Controlled Doses

1972 ◽  
Vol 55 (3) ◽  
pp. 639-642
Author(s):  
Robert J Hall ◽  
Theodore Farber
Keyword(s):  
Water Soluble ◽  
The Other ◽  
Ammonium Citrate ◽  
Acid Digestion ◽  
Short Term ◽  
Body Tissues ◽  
Short Term Exposure ◽  
Soluble Compound ◽  
Bismuth Salts

Abstract Controlled amounts of water-soluble and water-insoluble bismuth salts were administered to dogs. Body tissues and fluids were examined for resultant bismuth residues by an acid digestion-atomic absorption procedure. The method was shown to recover bismuth added to body tissues and fluids; the acid digestion released the bismuth residues almost completely. the highest levels of bismuth were found in the kidneys: about 10 ppm bismuth resulted from the administration of the waterinsoluble compound, bismuth subcarbonale, and about 60 ppm from the soluble compound, bismuth ammonium citrate . The levels of bismuth found in the urine were higher than those found in the other body tissues and the blood serum, but were still relatively low. No pathological manifestations were observed after short-term exposure to bismuth.

The Effect of Dimethyl Sulfoxide on In Vitro Platelet Function

1976 ◽  
Vol 36 (01) ◽  
pp. 221-229 ◽  
Author(s):  
Charles A. Schiffer ◽  
Caroline L. Whitaker ◽  
Morton Schmukler ◽  
Joseph Aisner ◽  
Steven L. Hilbert
Keyword(s):  
Platelet Count ◽  
Platelet Aggregation ◽  
Dimethyl Sulfoxide ◽  
Platelet Function ◽  
Platelet Volume ◽  
Short Term ◽  
Platelet Factor ◽  
Short Term Exposure ◽  
Structural Abnormalities

SummaryAlthough dimethyl sulfoxide (DMSO) has been used extensively as a cryopreservative for platelets there are few studies dealing with the effect of DMSO on platelet function. Using techniques similar to those employed in platelet cryopreservation platelets were incubated with final concentrations of 2-10% DMSO at 25° C. After exposure to 5 and 10% DMSO platelets remained discoid and electron micrographs revealed no structural abnormalities. There was no significant change in platelet count. In terms of injury to platelet membranes, there was no increased availability of platelet factor-3 or leakage of nucleotides, 5 hydroxytryptamine (5HT) or glycosidases with final DMSO concentrations of 2.5, 5 and 10% DMSO. Thrombin stimulated nucleotide and 5HT release was reduced by 10% DMSO. Impairment of thrombin induced glycosidase release was noted at lower DMSO concentrations and was dose related. Similarly, aggregation to ADP was progressively impaired at DMSO concentrations from 1-5% and was dose related. After the platelets exposed to DMSO were washed, however, aggregation and release returned to control values. Platelet aggregation by epinephrine was also inhibited by DMSO and this could not be corrected by washing the platelets. DMSO-plasma solutions are hypertonic but only minimal increases in platelet volume (at 10% DMSO) could be detected. Shrinkage of platelets was seen with hypertonic solutions of sodium chloride or sucrose suggesting that the rapid transmembrane passage of DMSO prevented significant shifts of water. These studies demonstrate that there are minimal irreversible alterations in in vitro platelet function after short-term exposure to DMSO.

Short-term exposure and long-term consequences of neonatal exposure to Δ9-tetrahydrocannabinol (THC) and ibuprofen in mice

2016 ◽  
Vol 307 ◽  
pp. 137-144 ◽  
Author(s):  
Gaëtan Philippot ◽  
Fred Nyberg ◽  
Torsten Gordh ◽  
Anders Fredriksson ◽  
Henrik Viberg
Keyword(s):  
Neonatal Exposure ◽  
Short Term ◽  
Short Term Exposure ◽  
Long Term Consequences

scholarly journals Spatio-temporal associations of air pollutant concentrations, GP respiratory consultations and respiratory inhaler prescriptions: a 5-year study of primary care in the borough of Lambeth, South London

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Mark Ashworth ◽  
◽  
Antonis Analitis ◽  
David Whitney ◽  
Evangelia Samoli ◽  
...  
Keyword(s):  
Primary Care ◽  
Negative Binomial ◽  
Hospital Admissions ◽  
Air Pollutant ◽  
Respiratory Morbidity ◽  
Short Term ◽  
Short Term Exposure ◽  
Short And Long Term ◽  
Spatio Temporal

Abstract Background Although the associations of outdoor air pollution exposure with mortality and hospital admissions are well established, few previous studies have reported on primary care clinical and prescribing data. We assessed the associations of short and long-term pollutant exposures with General Practitioner respiratory consultations and inhaler prescriptions. Methods Daily primary care data, for 2009–2013, were obtained from Lambeth DataNet (LDN), an anonymised dataset containing coded data from all patients (1.2 million) registered at general practices in Lambeth, an inner-city south London borough. Counts of respiratory consultations and inhaler prescriptions by day and Lower Super Output Area (LSOA) of residence were constructed. We developed models for predicting daily PM2.5, PM10, NO2 and O3 per LSOA. We used spatio-temporal mixed effects zero inflated negative binomial models to investigate the simultaneous short- and long-term effects of exposure to pollutants on the number of events. Results The mean concentrations of NO2, PM10, PM2.5 and O3 over the study period were 50.7, 21.2, 15.6, and 49.9 μg/m3 respectively, with all pollutants except NO2 having much larger temporal rather than spatial variability. Following short-term exposure increases to PM10, NO2 and PM2.5 the number of consultations and inhaler prescriptions were found to increase, especially for PM10 exposure in children which was associated with increases in daily respiratory consultations of 3.4% and inhaler prescriptions of 0.8%, per PM10 interquartile range (IQR) increase. Associations further increased after adjustment for weekly average exposures, rising to 6.1 and 1.2%, respectively, for weekly average PM10 exposure. In contrast, a short-term increase in O3 exposure was associated with decreased number of respiratory consultations. No association was found between long-term exposures to PM10, PM2.5 and NO2 and number of respiratory consultations. Long-term exposure to NO2 was associated with an increase (8%) in preventer inhaler prescriptions only. Conclusions We found increases in the daily number of GP respiratory consultations and inhaler prescriptions following short-term increases in exposure to NO2, PM10 and PM2.5. These associations are more pronounced in children and persist for at least a week. The association with long term exposure to NO2 and preventer inhaler prescriptions indicates likely increased chronic respiratory morbidity.

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