摘要:

AbstractThe literature on the bioactivity of seaweeds against bacteria, fungi, viruses and protozoa has been consulted to provide a consolidated report. Information on seaweed metabolites which are antimicrobial in nature is also briefly reported. An appendix provides the details on kind of seaweed, location, period of collection, active compound against microorganisms and reference source. It is possible to derive the details in connection with antimicrobial activity of seaweeds pertaining to regions, seasons, chemical nature and their activity against microorganisms.

ISSN:0323-4320    

DOI:10.1002/aheh.19910190502

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractMass and occasionally equivalent concentrations so far have been more widely used than amount concentrations. However, the preference is not justified. Mass concentrations distort the actual picture of water composition and properties. When expressing and interpreting the results of the chemical analysis of water and of technological experiments, amount concentrations of individual components, that are proportional to the real number of reacting particles, are of utmost significance. Therefore, only amount concentrations can correctly characterize quantitative relationships of the chemical and biological effects of compounds and make the comparison of the results possible. This claim is supported by examples in the field of hydrochemistry, biology and water technology.

ISSN:0323-4320    

DOI:10.1002/aheh.19910190503

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper describes a continuous‐flow system for use in testing the toxicity of dissolved compounds to aquatic organisms. This system can be used as a reliable device for volatile compounds, too. We used chloroform and benzene as the model substances. The proposed apparatus consists of two main parts‐the first part serves for a continuous preparation of a saturated solution of toxicant, the other one for a continuous dilution of toxicant and for a delivery of toxicant solutions to the individual test vessels. This device has two advantages: simple construction and reliability in operat

ISSN:0323-4320    

DOI:10.1002/aheh.19910190504

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

ISSN:0323-4320    

DOI:10.1002/aheh.19910190505

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractThe work was undertaken to investigate the mycoflora of the river Węgorapa and its tributary, the river Goldapa‐Jarka. Samples of water were collected in two years (1987‐1988) for hydrochemical analysis and studies of the content. Thirty‐seven species of fungi were found in these rivers. The following fungi, which had been unknown in Poland, were found in these rivers:Hapalopera fragilariae, Rhizophlyctis petersenii, Olpidiopsis vexans, Aphanomyces ovidestruensandPythium in

ISSN:0323-4320    

DOI:10.1002/aheh.19910190506

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractThe man made reservoir, G. B. Pant Sagar at the dam site (24° 15′ N Lat) in the South Mirzapur district of eastern U. P. was investigated in terms of water quality, phytoplankton diversity and production at monthly intervals between January 1987 and December 1987. The reservoir water showed low to moderate dissolved oxygen (4.3 … 7.5 mg/l) and quite low nutrient contents (0.01‐0.2 mg l−1). Phytoplankton diversity narrowly fluctuated (3.17‐3.74) and mean annual production (149.7 g/m3· aC) showed a meso‐ to eutrophic condition. A significant positive correlation was obtained between gross production and phytoplankton density (r= 0.79;P<0.001) Multiple regression equation (GPP = 11.292 + 0.043 BAC + 0.075 CHL + 0.073 CYN) indicates that Chlorophyta contributed more to gross production due to the presence of a higher number o

ISSN:0323-4320    

DOI:10.1002/aheh.19910190507

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractAs investigations on model solutions and real wastewaters with 30 … 33 g/l phenol and 5 … 10 g/l formaldehyde as well as pH = 2 … 3 have shown, the following technique of sewage purification proves to be optimal: condensation with addition of 7 g/l sulphuric acid at 98 °C, settling of the condensation products formed for 8 h, centrifugation of the supernatant and adsorption on activated carbon or a polymer sorbent (XAD 4). Preference should be given to activated carbon. The residual concentrations amount to 0.1 mg/l for both phenol and formaldehyde. The adsorbents are largely fully regenerated with methanol, the regeneration solution containing 11 … 20 g/

ISSN:0323-4320    

DOI:10.1002/aheh.19910190508

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractThe microbiological quality of water was studied in three parts of the stabilization system for the purification and utilization of dairy effluents (SVOBODA and KOUBEK). Results of three years of investigations dealing with the indicators of general, fecal and virus pollution by selected physiological groups of microorganisms, anaerobic microbes, some facultative pathogenic microorganisms and other selected groups of microorganisms are presented. The conclusions indicate that water discharged into the receiving river is microbiologically safe.

ISSN:0323-4320    

DOI:10.1002/aheh.19910190509

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

ISSN:0323-4320    

DOI:10.1002/aheh.19910190510

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractOn the laboratory scale investigations are carried out into the action of singlet oxygen, which is generated in water by addition of sodium‐hypochlorite and hydrogen‐peroxide solution, on Elbe river water and model waters. DOC does not change; COD, however, decreases considerably. The advantages and drawbacks of the treatment are sta

ISSN:0323-4320    

DOI:10.1002/aheh.19910190511

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY