OBJECTIVESThe main objective of the present article is to assess and evaluate the characteristics of the Nile water system, and identify the major sources of pollution and its environmental and health consequences. The article is also aimed to highlight the importance of water management via re-use and recycle of treated effluents for industrial purpose and for cultivation of desert land.

METHODAn intensive effort was made by the authors to collect, assess and compile the available data about the River Nile. Physico-chemical analyses were conducted to check the validity of the collected data. For the determination of micro-pollutants, Gas Chromatography (GC) and High Performance Liquid Chromatography (HPLC) were used. Heavy metals were also determined to investigate the level of industrial pollution in the river system.

RESULTSThe available data revealed that the river receives a large quantity of industrial, agriculture and domestic wastewater. It is worth mentioning that the river is still able to recover in virtually all the locations, with very little exception. This is due to the high dilution ratio. The collected data confirmed the presence of high concentrations of chromium and manganese in all sediment samples. The residues of organo-chlorine insecticides were detected in virtually all locations. However, the levels of such residues are usually below the limit set by the WHO for use as drinking water. The most polluted lakes are Lake Maryut and Lake Manzala. Groundwater pollution is closely related to adjacent (polluted) surface waters. High concentrations of nutrients, E. coli, sulfur, heavy metals, etc. have been observed in the shallow groundwater, largely surpassing WHO standards for drinking water use.

CONCLUSIONA regular and continuous monitoring scheme shall be developed for the River Nile system. The environmental law shall be enforced to prohibit the discharge of wastewater (agricultural, domestic or industrial) to River Nile system.

Egypt ; Environmental Monitoring ; Geologic Sediments ; chemistry ; Rivers ; chemistry ; Water Pollutants, Chemical ; analysis ; Water Supply ; standards

OBJECTIVETo study the relationship between the Geo-authentic and Geologic Background System (GBS) and physicochemical properties of cultivated soil in the Flos Lonicerae.

METHODThe analysis on the physicochemical properties of cultivated soil, the geologic background system in 5 producing areas of Flos Lonicerae was compared.

RESULTThe distribution of genuine Flos Lonicerae was restricted by GBS, which was mainly restricted in the temperate continental monsoon semi-arid climate zone between north latitude 34-36 degrees and east longitude 113-118 degrees.

CONCLUSIONThe most suitable soil for the genuine Flos Lonicerae is the neutral or weak alkali sandy loamy soil with higher ion exchanging capacity, and the soils from those producing areas are determined by soil-forming parent materials.

China ; Ecosystem ; Flowers ; growth & development ; Geologic Sediments ; Lonicera ; growth & development ; Pharmacognosy ; Plants, Medicinal ; growth & development ; Soil ; analysis

OBJECTIVECr(VI) removal from industrial effluents and sediments has attracted the attention of environmental researchers. In the present study, we aimed to isolate bacteria for Cr(VI) bioremediation from sediment samples and to optimize parameters of biodegradation.

METHODSStrains with the ability to tolerate Cr(VI) were obtained by serial dilution and spread plate methods and characterized by morphology, 16S rDNA identification, and phylogenetic analysis. Cr(VI) was determined using the 1,5-diphenylcarbazide method, and the optimum pH and temperature for degradation were studied using a multiple-factor mixed experimental design. Statistical analysis methods were used to analyze the results.

RESULTSFifty-five strains were obtained, and one strain (Sporosarcina saromensis M52; patent application number: 201410819443.3) having the ability to tolerate 500 mg Cr(VI)/L was selected to optimize the degradation conditions. M52 was found be able to efficiently remove 50-200 mg Cr(VI)/L in 24 h, achieving the highest removal efficiency at pH 7.0-8.5 and 35 °C. Moreover, M52 could completely degrade 100 mg Cr(VI)/L at pH 8.0 and 35 °C in 24 h. The mechanism involved in the reduction of Cr(VI) was considered to be bioreduction rather than absorption.

CONCLUSIONThe strong degradation ability of S. saromensis M52 and its advantageous functional characteristics support the potential use of this organism for bioremediation of heavy metal pollution.

Biodegradation, Environmental ; China ; Chromium ; metabolism ; Geologic Sediments ; microbiology ; RNA, Ribosomal, 16S ; genetics ; Sporosarcina ; genetics ; isolation & purification ; metabolism

OBJECTIVETo study the influence of inorganic elements in soil on the geolism of Atractylodes lancea.

METHODThe concentrations of 15 kinds of inorganic elements of regional A. lancea and their correspondingly soils were determined, and the data were analysed with the SPSS10.0 software.

RESULTThe mean concentration of Ni in geoherbs of A. lancea was 3 times higher than that in the non-geoherbs. The accumulation of Ca is high in geoberbs. There is no relationship between the concentrations of inorganic elements in A. lancea and those in their corresponding soil.

CONCLUSIONA. lancea adjusts the concentration of inorganic elements mainly by active absorption, and there are good relationship between the accumulation of Fe and Cr, Fe and Hg, Hg and Cr, As and Pb, Co and Sr.

Atractylodes ; chemistry ; Calcium ; analysis ; Chromium ; analysis ; Fluorocarbons ; analysis ; Geologic Sediments ; analysis ; Iron ; analysis ; Nickel ; analysis ; Plants, Medicinal ; chemistry ; Rhizome ; chemistry ; Soil ; analysis

OBJECTIVETo study the relationship between the geo-authentic and geologic background system (GBS) and physicochemical properties of soil for the cultivation of Panax notoginseng.

METHODThe physicochemical properties of soil were analyzed, the geologic background system between producing areas of Yunnan and Guanxi of P. notogiseng was compared.

RESULTThe distribution of P. notoginseng was restricted by GBS, The yellow-red soil of fragmentary rock mixed with carbonate seems to be most suitable for the growth.

CONCLUSIONThe most suitable soil for growing P. notoginseng is the neutral or weakly acidic soil with loam clay, particularly that with low base saturation percentage.

China ; Ecosystem ; Geologic Sediments ; Hydrogen-Ion Concentration ; Panax ; anatomy & histology ; growth & development ; Pharmacognosy ; Plants, Medicinal ; anatomy & histology ; growth & development ; Quality Control ; Soil

Genetic diversity of 18 Acanthamoeba isolates from ocean sediments was evaluated by comparing mitochondrial (mt) DNA RFLP, 18S rDNA sequences and by examining their cytopathic effects on human corneal epithelial cells versus reference strains. All isolates belonged to morphologic group II. Total of 16 restriction phenotypes of mtDNA from 18 isolates demonstrated the genetic diversity of Acanthamoeba in ocean sediments. Phylogenetic analysis using 18s rDNA sequences revealed that the 18 isolates were distinct from morphological groups I and III. Fifteen isolates showed close relatedness with 17 clinical isolates and A. castellanii Castellani and formed a lineage equivalent to T4 genotype of Byers' group. Two reference strains from ocean sediment, A. hatchetti BH-2 and A. griffini S-7 clustered unequivocally with these 15 isolates. Diversity among isolates was also evident from their cytopathic effects on human corneal cells. This is the first time describing Acanthamoeba diversity in ocean sediments in Korea.
Variation (Genetics)/*genetics ; RNA, Ribosomal, 18S/genetics ; Phylogeny ; Oceans and Seas ; Humans ; Geologic Sediments/*parasitology ; Epithelium, Corneal/cytology ; Epithelial Cells/parasitology ; DNA, Mitochondrial/genetics ; Animals ; Acanthamoeba/*genetics/*isolation & purification

An automatic system for marine meiobenthos separation was developed by using laser-induced fluorescence technology. Rose Bengal was used as organism dye and the spectrums of Rose Bengal were measured. Laser-induced fluorescence system was established to detect marine meiobenthos in sediments. Data obtained from experiments were analyzed by using a mathematical model. The results showed that laser-induced fluorescence technology worked well in the system. The system could select the meiobenthos efficiently and precisely.
Algorithms ; Animals ; Equipment Design ; Equipment Failure Analysis ; Filtration ; methods ; Geologic Sediments ; analysis ; Invertebrates ; classification ; Lasers ; Oceans and Seas ; Pattern Recognition, Automated ; methods ; Spectrometry, Fluorescence ; methods

Marine Actinobacteria are emerging as new resources for bioactive natural products with promise in novel drug discovery. In recent years, the richness and diversity of marine Actinobacteria from the South China Sea and their ability in producing bioactive products have been investigated. The objective of this work is to isolate and identify bioactive secondary metabolites from a marine actinobacterium SCSIO 1934 derived from sediments of South China Sea. The strain was identified as a Streptomyces spieces by analyzing its 16S rDNA sequence. Streptomyces sp. SCSIO 1934 was fermented under optimized conditions and seven bioactive secondary metabolites were isolated and purified by chromatographic methods including colum chromatography over silica gel and Sephadex LH-20. Their structures were elucidated as 17-O-demethylgeldanamycin (1), lebstatin (2), 17-O-demethyllebstatin (3), nigericin (4), nigericin sodium salt (5), abierixin (6), respectively, by detailed NMR spectroscopic data (1H, 13C, COSY, HSQC and HMBC). This work provided a new marine actinobacterium Streptomyces sp. SCSIO 1934, capable of producing diverse bioactive natural products.
Anti-Bacterial Agents ; chemistry ; China ; DNA, Ribosomal ; chemistry ; genetics ; Geologic Sediments ; microbiology ; Oceans and Seas ; RNA, Ribosomal, 16S ; genetics ; Streptomyces ; chemistry ; classification ; genetics ; isolation & purification

OBJECTIVETo explore the diversity changes of microbial communities and bla(CTX-M) in an urban river sediment community with cefotaxime treatment.

METHODSThe terminal restriction fragment length polymorphism (T-RFLP) of 16S rDNA was employed to analyze the bacteria community, and the bla(CTX-M) was determined using nested PCR. The sediment was treated by cefotaxime at the concentrations of 0, 6.4, 64, and 320 mg/L.

RESULTSAccording to statistical analysis of the T-RFs, no significant correlation was observed between the antibiotic treatment and the microbial community change, but incubation in laboratory conditions had significant effect on the microbial diversity. The PCR results showed that the diversity of bla(CTX-M) decreased after the laboratory incubation.

CONCLUSIONAs there are diverse antibiotic resistant bacteria in the sediments with prior pollution by antibiotics, the whole community can be inert to the antibiotic treatment. Nevertheless, the ex situ treatment conditions in laboratory studies have a significant impact on the community structures.

Biodiversity ; Cefotaxime ; pharmacology ; Ceftazidime ; pharmacology ; Cities ; Escherichia coli Proteins ; genetics ; Geologic Sediments ; microbiology ; Polymorphism, Restriction Fragment Length ; RNA, Ribosomal, 16S ; genetics ; Rivers ; Water Microbiology ; beta-Lactamases ; genetics

Agricultural activities, including stock-farming, planting industry, and fish aquaculture, can affect the physicochemical and biological characters of freshwater lakes. However, the effects of pollution producing by agricultural activities on microbial ecosystem of lakes remain unclear. Hence, in this work, we selected Honghu Lake as a typical lake that is influenced by agriculture activities. We collected water and sediment samples from 18 sites, which span a wide range of areas from impacted and less-impacted areas. We performed a geospatial analysis on the composition of microbial communities associated with physicochemical properties and antibiotic pollution of samples. The co-occurrence networks of water and sediment were also built and analyzed. Our results showed that the microbial communities of impacted and less-impacted samples of water were largely driven by the concentrations of TN, TP, NO-N, and NO-N, while those of sediment were affected by the concentrations of Sed-OM and Sed-TN. Antibiotics have also played important roles in shaping these microbial communities: the concentrations of oxytetracycline and tetracycline clearly reflected the variance in taxonomic diversity and predicted functional diversity between impacted and less-impacted sites in water and sediment samples, respectively. Furthermore, for samples from both water and sediment, large differences of network topology structures between impacted and less-impacted were also observed. Our results provide compelling evidence that the microbial community can be used as a sentinel of eutrophication and antibiotics pollution risk associated with agricultural activity; and that proper monitoring of this environment is vital to maintain a sustainable environment in Honghu Lake.
Agriculture ; Animals ; Anti-Bacterial Agents ; analysis ; China ; Eutrophication ; Geologic Sediments ; chemistry ; microbiology ; Lakes ; chemistry ; microbiology ; Microbiota ; Risk Factors ; Water Pollutants, Chemical ; analysis