Evaluation of On-site Wastewater Disposal Systems in Mississippi Coastal Areas     

Ayanangshu Dey  Dennis D. Truax 《Water, air, and soil pollution》2012,223(5):2145-2156

Groundwater and surface water contamination have been linked to inadequate or failing on-site residential wastewater treatment and disposal systems. The potential for groundwater contamination in coastal areas with shallow water tables is higher; subsequently the ability of soil, microorganisms, and vegetation to mitigate pollutants may be reduced. This study evaluated the performance of the four types of on-site wastewater treatment and disposal systems predominantly used on the Mississippi Gulf Coast. One type of system was deemed inappropriate for this region as none of the dozens of installations examined were functioning acceptably. Of the remaining three types, subsurface water samples were collected from representative sites using lysimeters and monitoring wells. Apart from general performance evaluation of these systems, seasonal changes translating into possible variation in disposal efficiencies and groundwater contamination were investigated. Statistical analysis of variations in organics (COD and BOD₅), nitrogen (TKN and NH ₄ ⁺ ?CN), and fecal coliform concentrations was used to identify probable deficiencies in systems tested and to recommend changes to governing standards.  相似文献   

Effect of high inclusion of rendered animal by‐product ingredients on growth,digestibility and economic performances in climbing perch Anabas testudineus          下载免费PDF全文

Md Sakhawat Hossain  Md Abdul Kader  Tanwi Dey  Nadia Mahjabin Sony  Mahbuba Bulbul  Shunsuke Koshio 《Aquaculture Research》2017,48(3):931-940

A 70‐day growth trail was conducted to investigate the effects of inclusion of high levels of meat and bone meal (MBM) and protein concentrate (PC) on growth, digestibility and economic performances of climbing perch, Anabas testudineus. Four isonitrogenous diets were formulated by lowering the level of dietary fishmeal protein at 0 (D₁, control), 70 (D₂), 85 (D₃) and 100% (D₄) with a mixture of MBM and PC protein (1:1). Triplicate groups of 300 fish (mean weight of 0.80 g) stocked in each 40 m² pond and fed the respective test diets. A digestibility trial was conducted after the growth trial in indoor glass aquarium. The result showed that growth parameters were significantly decreased (P < 0.05) with fishmeal replacement levels. However, significant differences were not found in feed conversion ratio and survival of fish. No difference was also found in protein efficiency ratio among D1, D2 and D3. Similar to growth parameters, total fish production was highest in D1, intermediate in D2 and D3; and lowest in D4. Apparent digestibility coefficients of dry matter, protein and lipid were highest (P < 0.05) in D1 and lowest in D4. The economic analysis revealed that the benefit cost ratio was ranked by D₃ (1.81), D₂ (1.71), D₁ (1.66) and D₄ (1.46) respectively. Upon considering the overall performances and unavailability of finite protein sources, it can be concluded that 70–85% fishmeal could be replaced with a mixture of MBM and PC (1:1) in practical diets for climbing perch.  相似文献   

Exploration of ready-to-eat soft Bora rice genotypes of Assam for submergence tolerance     

Panja  Suraj  Mondal  Kongkong  Kar  Rup Kumar  Dey  Pradip Chandra  Dey  Narottam 《Journal of Crop Science and Biotechnology》2023,26(1):87-95

Journal of Crop Science and Biotechnology - Assamese Bora rice lines are valuable genetic resource for their socio-economic importance and traditional usage. Being lowland rice lines of upper...  相似文献   

9-cis Retinoic acid inhibits cumulus cell apoptosis during the maturation of bovine cumulus-oocyte-complexes     

Deb GK  Dey SR  Bang JI  Lee JG  Kong IK 《Journal of animal science》2012,90(6):1798-1806

  相似文献   

Functional risk assessment of handling of sheep housing and pasture areas at a scrapie-infested farm in Mecklenburg-West Pomerania     

Hüttner K  Kiupel H  Dey E 《Berliner und Münchener tier?rztliche Wochenschrift》2004,117(5-6):226-229

In the wake of a scrapie monitoring programme 2002 in Mecklenburg-Westpomerania a total of 10 positive cases were identified after culling at a suffolk-farm with about 1000 animals. Scientific based recommendations are difficult to judge as longitudinal studies and subsequent quantitative risk factors regarding the epidemiology of scrapie are either not available or conflicting. Given this background a risk assessment was developed that is based on the probability of validated risk factors considering special husbandry and circumstances at the very farm.  相似文献   

Neuropharmacological effects of deltamethrin in rats     

S. Manna  D. Bhattacharyya  T. K. Mandal  S. Dey 《Journal of veterinary science (Suw?n-si, Korea)》2006,7(2):133-136

This study examined the effect of deltamethrin on some of the neuropharmacological paradigms in a rat brain such as the motor co-ordination test using a rotarod, the pentobarbitone-induced sleeping time and pentylenetetrazole (PTZ)-induced convulsion as well as the gamma aminobutyric acid (GABA) level. Albino Wistar rats were used as the experimental animals. Different neuropharmacological paradigms such as the motor co-ordination by the rotarod, pentobarbitone-induced sleeping time and the PTZ-induced convulsion were examined after administering deltamethrin orally at two doses, 150 mg/kg (LD₅₀) and 15 mg/kg (1/10 LD₅₀). The GABA level in the rat brain was estimated by HPLC after a single oral dose of 150mg/kg deltamethrin. Deltamethrin significantly reduced the motor coordination, decreased the onset time and increased the sleeping time duration induced by pentobarbitone. In addition, it also decreased the onset time and increased the duration of convulsions induced by PTZ at 150 mg/kg (LD₅₀) and 15 mg/kg (1/10 LD₅₀), respectively. Further deltamethrin administration decreased the GABA levels in the cerebellum as well as in the whole brain (except the cerebellum) significantly at the LD₅₀ dose level. There was some correlation between the effect of deltamethrin on the central GABA levels and its neuropharmacological effects.  相似文献   

Prüfung der coccidiostatischen Wirksamkeit von Coyden 25®1 auf Eimeria tenella durch quantitative Bestimmung der Blutmenge in den Blinddärmen mit Hilfe Fe59-markierter Erythrozyten     

K. Enigk  H. Schanzel  A. Dey Hazra 《Zoonoses and public health》1968,15(9):984-989

  相似文献   

Therapeutic responses of piglets to experimentally induced colibacillosis.     

B P Dey  D C Blenden  G C Burton  H E Mercer  R K Tsutakawa 《Research in veterinary science》1977,23(3):340-343

The purpose of these experiments was to determine the effects of prior exposure to antimicrobials on subsequent treatment of artificially induced colibacillosis in pigs. One- to two-week-old piglets were given 10(7) multiple antibiotic resistant Escherichia coli orally. Two groups of the piglets received priming doses at different levels of the antimicrobial preparation, ASP-250 before challenge. The remaining group received no antimicrobial. Piglets ill as a result of the challenge were treated with chloramphenicol of chlortetracycline, or received no treatment. Chloramphenicol was significantly more effective than chlortetracycline in terminating colibacillosis in the primed and unprimed groups. There were fewer deaths and relapse cases in those groups which received chloramphenicol treatment. Results in piglets treated with chlortetracycline were not significantly better than those which received no treatment.  相似文献   

Effect of initial seedling size,understory competition,and overstory density on the survival and growth of Pinus echinata seedlings underplanted in hardwood forests for restoration     

John M. Kabrick  Benjamin O. Knapp  Daniel C. Dey  David R. Larsen 《New Forests》2015,46(5-6):897-918

  相似文献   

Effect of Tree Diversity on Soil Organic Carbon Content in the Homegarden Agroforestry System of North-Eastern Bangladesh     

Islam  Mahmuda  Dey  Anna  Rahman  Mizanur 《Small-Scale Forestry》2015,14(1):91-101

Small-scale Forestry - Tropical agroforestry systems have immense potential to sequester carbon both in aboveground and belowground biomass and soil. Homegarden agroforestry is a popular land-use...  相似文献