Using gamma distribution to determine half-life of rotenone, applied in freshwater

Rohan, Maheswaran; Fairweather, A.; Grainger, Natasha

doi:10.1016/j.scitotenv.2015.04.059

Cited by 22 publications

(9 citation statements)

References 11 publications

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“…If the S contains two adjacent D (d1, d2) with R0< MIDI< R1, the drought month is still defined as one drought event with D=d1+d2+1 and S=s1+s2, otherwise, two independent drought events will be recorded in this drought month. In this study, three functions, including the exponential distribution, lognormal distribution and gamma distribution, are all applied to fit drought duration and severity, and the specific procedures of these three distribution functions are described by Kayid and Izadkhah (2015), Li et al, (2015) and Rohan et al, (2015), respectively.…”

Section: Identification Of a Drought Event Based On Midimentioning

confidence: 99%

Copula-based drought risk assessment combined with an integrated index in the Wei River Basin, China

Chang

Wang

et al. 2016

Journal of Hydrology

187

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Section: Identification Of a Drought Event Based On Midimentioning

confidence: 99%

Copula-based drought risk assessment combined with an integrated index in the Wei River Basin, China

Chang

Wang

et al. 2016

Journal of Hydrology

187

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“…This compound is a natural toxin derived from the roots and stems of several plants of the family Leguminosae (Rohan et al 2015). Rotenone possesses significant activity against many taxa, including the mite Panonychus citri (McGregor) (Prostigmata: Tetranychidae), the nematode Bursaphelenchus xylophilus (Steiner & Buhrer) Nickle (Aphelenchida: Parasitaphelenchidae), and the insect Phyllotreta vittata (Fabricius) (Coleoptera: Chrysomelidae) (Zeng et al 2002;Hu et al 2005;Zeng et al 2009).…”

mentioning

confidence: 99%

Monitoring of Resistance to New Chemistry Insecticides in Spodoptera litura (Lepidoptera: Noctuidae) in Pakistan

Ahmad

Mehmood

2015

Journal of Economic Entomology

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“…24-day log 10 removal rates are summarized inTable 3. A gamma distribution of inactivation rate coefficients following the work of Körmendy et al (1999) and Rohan et al (2015) was also derived, and the results are shown in First, there were no significant differences between percent removals in Reactors 1 and 2 for either Giardialamblia (p= 0.78) or Cryptosporidiumparvum (p=0.29) ( Figure 2); however, inactivation rates were lower in Reactor 3 (PBS control). These results suggest that at 20°C and neutral pH, the presence of TAN and VFA significantly increased the inactivation rate of the (oo)cysts when compared with the control reactor.…”

Section: Inactivation Of Cryptosporidium Parvum and Giardia Lambliamentioning

confidence: 98%

Viability and fate of Cryptosporidium parvum and Giardia lamblia in tubular anaerobic digesters

Kinyua

Trimmer

Izurieta

et al. 2016

Science of The Total Environment

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In many developing countries where pathogenic diseases of animal waste origin, such as giardiasis and cryptosporidiosis, are often prevalent, facilities are limited to treat livestock waste. However, household-scale anaerobic digesters are currently being promoted for bioenergy production from livestock manure. Since the effluent is often used as a fertilizer for food crops, it is critical to understand the effect of environmental conditions within household-scale digesters on the viability of Cryptosporidium parvum oocysts and Giardia lamblia cysts. In this study, key environmental parameters affecting (oo)cyst inactivation were measured in four tubular anaerobic digesters, which are a type of household-scale digester promoted for treatment of swine waste in rural Costa Rica. Interviews and participant observations were used to understand digester operation and maintenance procedures. Ambient temperatures (21-24°C), near-neutral pH, total ammonia nitrogen (TAN) concentrations<250 mg/L and hydraulic retention times (HRTs) between 23 and 180 days were observed. Laboratory (oo)cysts inactivation studies were performed in bench-scale digesters, which were maintained under conditions similar to those observed in the field. Apparent first-order inactivation rate coefficients for Giardia lamblia and Cryptosporidium parvum were 0.155 ± 0.041 and 0.054 ± 0.006 day(-1), respectively. Temperature and volatile fatty acids were the main factors contributing to Cryptosporidium parvum and Giardia lamblia inactivation. A mathematical model was developed that predicts the concentration of (oo)cysts in the liquid effluent of tubular digesters like those observed in Costa Rica. A mathematical model was developed that predicts the concentration of (oo)cysts in the liquid effluent of tubular digesters like those observed in Costa Rica. Two dimensionless groups can be used to predict the performance of the digesters for inactivating pathogens; both dimensionless groups depend upon the average HRT in the digester. This is the first study to combine mathematical modeling with qualitative analysis, field and laboratory studies to predict the concentrations of (oo)cysts in tubular digester effluents.

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Using gamma distribution to determine half-life of rotenone, applied in freshwater

Cited by 22 publications

References 11 publications

Copula-based drought risk assessment combined with an integrated index in the Wei River Basin, China

Copula-based drought risk assessment combined with an integrated index in the Wei River Basin, China

Monitoring of Resistance to New Chemistry Insecticides in Spodoptera litura (Lepidoptera: Noctuidae) in Pakistan

Viability and fate of Cryptosporidium parvum and Giardia lamblia in tubular anaerobic digesters

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