Two amphibian species,Megophrys daweimontisandAmolops vitreus,are recorded for the ifrst time from Vietnam, on the basis of a new amphibian collection from Dien Bien and Son La provinces. In addition, acoustic analysi...Two amphibian species,Megophrys daweimontisandAmolops vitreus,are recorded for the ifrst time from Vietnam, on the basis of a new amphibian collection from Dien Bien and Son La provinces. In addition, acoustic analysis ofA. vitreus is also provided based on the advertisement calls recorded in Muong Nhe Nature Reserve of Dien Bien Province, Vietnam.展开更多
Removal of vegetal oil from wastewater using comercial resins in batch reactors processes is studied in present study. A traditional and patented type of three different surfactants was used for stabilizing of the emu...Removal of vegetal oil from wastewater using comercial resins in batch reactors processes is studied in present study. A traditional and patented type of three different surfactants was used for stabilizing of the emulsion phase. The results for the emulsion made by the synthesized surfactant showed much better stability and performance in the separation process compared to that by conventionally used Span 80. To determine the optimum operation conditions, the effect of several parameters such as initial oil concentration, amount of resin in the solid phase, adding or not a surfactant, resin type, and stabilizer concentration have been investigated. It was found that under the optimum conditions, more than 98% ofoil can be removed in a single batch process.展开更多
Common pastures were once the dominant type of land use in many Euro-pean regions.However,during the past 150 years,they have declined dramatically.Recent studies have shown that they are hotspots for rare plant,butte...Common pastures were once the dominant type of land use in many Euro-pean regions.However,during the past 150 years,they have declined dramatically.Recent studies have shown that they are hotspots for rare plant,butterfly,and bird species in the study area,the Bavarian pre-Alps(southern Germany).However,studies on the value of these pastures for Orthoptera(hereinafter termed"grasshoppers")have been scarce.Here,we studied the effects of traditional summer grazing in common pastures on grasshopper assemblages.Our study revealed that grasshopper species richness did not differ between common pastures(n=57)and controls(n=57).By contrast,density of all and of threat-ened species varied between common pastures and controls in all plots and within the two vegetation types with the highest grasshopper abundance,grasslands on mineral soil and fens.Two threatened species,Pseudochorthippus montanus and Stethophyma grossum,were identified as indicators for common pastures;controls had no indicative species.Traditional low-intensity grazing in common pastures has resulted in open and heteroge-neous swards with some bare ground,a low cover of litter and an intermediate vegetation height favouring high densities of grasshopper species in general and threatened species in particular.This is especially true for the two most productive vegetation types,grasslands on mineral soil and fens.To promote biodiversity in general and grasshopper densities in particular,we recommend maintaining traditional cattle grazing(stocking capacities:0.5-2.0 livestock units/ha)in common pastures.Where possible,this grazing regime should also be introduced in the surrounding landscape.展开更多
基金supported by the Hanoi National University of Education (Small Grant No. SPHN-13-247)Field work and equipment was partially supported by the Idea Wild to D.T. LE and A.V. PHAM+1 种基金Research of T.Q. NGUYEN in northwestern Vietnam is funded by the National Geographic Society (Grant No. 9492-14)the Alexander von Humboldt Foundation (VIE 114344)
文摘Two amphibian species,Megophrys daweimontisandAmolops vitreus,are recorded for the ifrst time from Vietnam, on the basis of a new amphibian collection from Dien Bien and Son La provinces. In addition, acoustic analysis ofA. vitreus is also provided based on the advertisement calls recorded in Muong Nhe Nature Reserve of Dien Bien Province, Vietnam.
文摘Removal of vegetal oil from wastewater using comercial resins in batch reactors processes is studied in present study. A traditional and patented type of three different surfactants was used for stabilizing of the emulsion phase. The results for the emulsion made by the synthesized surfactant showed much better stability and performance in the separation process compared to that by conventionally used Span 80. To determine the optimum operation conditions, the effect of several parameters such as initial oil concentration, amount of resin in the solid phase, adding or not a surfactant, resin type, and stabilizer concentration have been investigated. It was found that under the optimum conditions, more than 98% ofoil can be removed in a single batch process.
文摘Common pastures were once the dominant type of land use in many Euro-pean regions.However,during the past 150 years,they have declined dramatically.Recent studies have shown that they are hotspots for rare plant,butterfly,and bird species in the study area,the Bavarian pre-Alps(southern Germany).However,studies on the value of these pastures for Orthoptera(hereinafter termed"grasshoppers")have been scarce.Here,we studied the effects of traditional summer grazing in common pastures on grasshopper assemblages.Our study revealed that grasshopper species richness did not differ between common pastures(n=57)and controls(n=57).By contrast,density of all and of threat-ened species varied between common pastures and controls in all plots and within the two vegetation types with the highest grasshopper abundance,grasslands on mineral soil and fens.Two threatened species,Pseudochorthippus montanus and Stethophyma grossum,were identified as indicators for common pastures;controls had no indicative species.Traditional low-intensity grazing in common pastures has resulted in open and heteroge-neous swards with some bare ground,a low cover of litter and an intermediate vegetation height favouring high densities of grasshopper species in general and threatened species in particular.This is especially true for the two most productive vegetation types,grasslands on mineral soil and fens.To promote biodiversity in general and grasshopper densities in particular,we recommend maintaining traditional cattle grazing(stocking capacities:0.5-2.0 livestock units/ha)in common pastures.Where possible,this grazing regime should also be introduced in the surrounding landscape.
