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641.
Shaalan EA Canyon D Younes MW Abdel-Wahab H Mansour AH 《Environment international》2005,31(8):618-1166
Identification of novel effective mosquitocidal compounds is essential to combat increasing resistance rates, concern for the environment and food safety, the unacceptability of many organophosphates and organochlorines and the high cost of synthetic pyrethroids. An increasing number of researchers are reconsidering botanicals containing active phytochemicals in their efforts to address some of these problems. To be highly competitive and effective, the ideal phytochemical should possess a combination of toxic effects and residual capacity. Acute toxicity is required at doses comparable to some commercial synthetic insecticides while chronic or sub-chronic toxicity is required to produce growth inhibition, developmental toxicity and generational effects. In this article, we review the current state of knowledge on larvicidal plant species, extraction processes, growth and reproduction inhibiting phytochemicals, botanical ovicides, synergistic, additive and antagonistic joint action effects of mixtures, residual capacity, effects on non-target organisms, resistance, screening methodologies, and discuss promising advances made in phytochemical research. 相似文献
642.
643.
Megat Hanafiah Megat Ahmad Kamal Wan Mat Khalir Wan Khaima Azir MohamedKasmawati Zakaria Haslizaidi Wan Ngah Wan Saime 《环境科学学报(英文版)》2010,22(2):248-256
Rubber leaf powder (an agricultural waste) was treated with potassium permanganate followed by sodium carbonate and its
performance in the removal of Pb(II) ions from aqueous solution was evaluated. The interactions between Pb(II) ions and functional
groups on the adsorbent surface were confirmed by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy
(SEM) coupled with X-ray energy dispersive spectroscopy (EDX). The effects of several important parameters which can affect
adsorption capacity such as pH, adsorbent dosage, initial lead concentration and contact time were studied. The optimum pH range
for lead adsorption was 4–5. Even at very low adsorbent dosage of 0.02 g, almost 100% of Pb(II) ions (23 mg/L) could be removed.
The adsorption capacity was also dependent on lead concentration and contact time, and relatively a short period of time (60–90
min) was required to reach equilibrium. The equilibrium data were analyzed with Langmuir, Freundlich and Dubinin-Radushkevich
isotherms. Based on Langmuir model, the maximum adsorption capacity of lead was 95.3 mg/g. Three kinetic models including pseudo
first-order, pseudo second-order and Boyd were used to analyze the lead adsorption process, and the results showed that the pseudo
second-order fitted well with correlation coefficients greater than 0.99. 相似文献
644.
GIS and remote sensing as tools for conducting geo-hazards risk assessment along Gulf of Aqaba coastal zone,Egypt 总被引:2,自引:0,他引:2
Satellite remote sensing data, in addition to Geographic Information Systems (GIS), offers an excellent alternative to conventional
mapping techniques in monitoring and mapping of geo-hazards areas. One of the most sustainable development projects in Egypt
has been accomplished in Sinai, especially along and around the Gulf of Aqaba and the Gulf of Suez. Variations along the coastal
zone of the Gulf of Aqaba have been identified through the analysis of multi-temporal satellite images with the aid of GIS
analysis. The study area is subject to rapid and increasing changes in land-use/land-cover that resulting from natural and
human activities such as flash flooding, seismic activity, landslides, and tourist and urban activities. This is in addition
to the construction projects of roads, ports, PowerStation stations, mineral exploration, beaches, and tourist villages resulting
from major environmental impacts. The current study aims to use Remote Sensing and GIS tools to investigate, monitor, and
assess geo-hazards through the building of a geographical database. Several techniques have been developed over the last decade
mostly to study the geological and geomorphologic characteristics of the terrain; land-use and land-cover changes. These are
based on satellite imagery and Digital Elevation Models (DEM) to determine the topographic features, and geo-hazards maps.
It is concluded that integrated approaches to monitoring can successfully be used to assess the environmental impacts along
the Gulf of Aqaba coastal zone. 相似文献
645.
Mohamed A. K. Elsayed 《Journal of Coastal Conservation》2011,15(4):639-645
In this paper, a cross-shore profile evolution model, Uniform Beach Sediment Transport-Time-Averaged Cross-Shore (UNIBEST-TC),
is used. The model was developed at WL/Delft hydraulic laboratory in the Netherlands. The model is used to predict wave height
in a barred beach (Egmond site, The Netherlands) and the results show that there is a good agreement between the measured
and predicted values by the model. In the present study, Morlet wavelet is used to distinguish the breaking waves; it is integrated
over frequency to provide the temporal variation of localized total energy. The study shows that the local peaks of the energy
densities correspond to the events of wave breaking in the predicted–wave time series. Furthermore, the wave energy distribution
shows a tendency to decrease in the off-shore direction of the inner bar. 相似文献
646.
Potential for internal loading by phosphorus based on sequential extraction of surficial sediment in a shallow Egyptian Lake 总被引:1,自引:0,他引:1
Maha Ahmed Mohamed Abdallah 《Environmental monitoring and assessment》2011,178(1-4):203-212
The fractionation of phosphorus (P) in shallow Lake Maryout surficial sediments was investigated in order to understand its potential availability in relation to the eutrophication status of this lake. The rank order of P fractions was NaOH-P > HCl-P > NH4Cl-P > BD-P. The metal oxide-bound P (NaOH-P) averaged 43% in this hypereutrophic lake and would be potentially available under low oxygen conditions. The highly available, loosely sorbed P (NH4Cl-P) represented 20% of the sedimentary inorganic P on average, while the reductant P (BD-P) averaged 15% and is also considered highly available under low oxygen conditions. The less available calcium-bound P (HCl-P) represented 22% of sedimentary inorganic P. Lake Maryout exhibits high potential for release of P from sediment in forms available to algae, which is undesirable for eutrophication control. The range of potentially available P in tested sediments was 1,541 to 3,990 mg/kg (ppm), a very high quantity capable of supporting algal blooms independent of external loading. 相似文献
647.
Bin-Jumah May Abdel-Fattah Abdel-Fattah M. Saied Essa M. El-Seedi Hesham R. Abdel-Daim Mohamed M. 《Environmental science and pollution research international》2021,28(11):13031-13046
Environmental Science and Pollution Research - Acrylamide is a chemical monomer; its polymer compounds are used in the manufacture of plastic, papers, adhesive tapes, dyes, and food packaging.... 相似文献
648.
El-Sayyad Gharieb S. Hasan Omnia F. Saad Mohamed A. M. El-Batal Ahmed I. 《Environmental science and pollution research international》2021,28(23):29200-29220
Environmental Science and Pollution Research - Different ancillary immunodiagnostic tests were traditionally-established for diagnosis of bovine tuberculosis (BTB) either cellular or humoral as... 相似文献
649.
Nassar Safaa Ezzat Said Radwa Mohamed 《Environmental science and pollution research international》2021,28(39):54565-54574
Environmental Science and Pollution Research - Soil contamination with crude oil is a major environmental problem. The aim of this study was to assess whether the earthworm Allolobophora caliginosa... 相似文献
650.
Seidavi Alireza Tavakoli Masomeh Slozhenkina Marina Gorlov Ivan Hashem Nesrein M. Asroosh Fariborz Taha Ayman E. Abd El-Hack Mohamed E. Swelum Ayman A 《Environmental science and pollution research international》2021,28(35):47856-47868
Environmental Science and Pollution Research - Improving poultry production, increasing poultry immunity, and reducing the disease spreading can be achieved by adding various potentially valuable... 相似文献