摘要:

An epidemiological study was undertaken to compare the lead hazards in the housing environment of lead poisoned children (aged 1–7) and matched non‐poisoned control children. The results indicated a greater frequency and higher levels of lead in paint on both interior and exterior surfaces of the houses of the cases compared to the controls and suggested that intact painted surfaces as well as loose painted surfaces may be a lead hazard. Other sources of lead exposure (i.e., soil, drinking water, and atmosphere) and reported pica behavior were not significantly different between cases and controls.

ISSN:0360-1226    

DOI:10.1080/10934527909374870

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Ozone toxicity to bluegill (Lepomis macrochirus)was determined using standard bioassay procedures. In initial work bluegill were exposed to water containing ozone for 24 h; the LC50was 0.06 ppm. A second experiment simulated “shock defouling” — the periodic dosing of power plant cooling water with high biocide concentrations to prevent biofouling. The LC50for a series of six 30‐min exposure periods spaced 8 h apart was 0.32 ppm. A third experiment attempting to determine the effects of sublethal concentrations resulted in the death of 9 of 15 bluegill after 4 weeks of exposure to 0.01 ppm of ozone. No controls died in any experiment.

ISSN:0360-1226    

DOI:10.1080/10934527909374871

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The potential management of red tide blooms through inoculation with concentrated, frozen cultures of the blue‐green algaGomphosphaeria aponinais considered.G. aponinahas been shown to elaborate a natural product termed “aponin,” cytolytic toward laboratory cultures of the red tide organismPtychodiscus brevis, Davis (Steidinger)1. Large cultures ofG. aponina(18–20 liter) can be concentrated by centrifugation (1010cells/ml) and stored frozen at ‐30°C. Studies show that viable, aponin‐producing cultures can be regenerated after being frozen up to 6 weeks.

ISSN:0360-1226    

DOI:10.1080/10934527909374872

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0360-1226    

DOI:10.1080/10934527909374873

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The kinetics of absorption of gaseous stream containing 5.6% hydrogen sulfide, 11% hydrogen and a balance of nitrogen, with calcium oxide powder was studied by thermogravometric technique. This reaction was studied in the temperature range of 600 ‐ 750 °C. The initial rates of the reaction were high, however the reaction slackened at conversions in excess of 0.5. The initial stages of the reaction followed the unreacted care model (UCM) in its chemical regime. Based on this model, the reaction rate constant at initial stage was estimated as:

ISSN:0360-1226    

DOI:10.1080/10934527909374874

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0360-1226    

DOI:10.1080/10934527909374869

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor