Removal of Chromium (VI) From Leachate Using Bacterial Biomass

2013 ◽  
Vol 11 (11) ◽  
pp. 63-65 ◽  
Author(s):  
Ramesh Pun ◽  
Prakash Raut ◽  
Boj Raj Pant

Scientific World, Vol. 11, No. 11, July 2013, page 63-65 DOI: http://dx.doi.org/10.3126/sw.v11i11.8554

2019 ◽  
Vol 800 ◽  
pp. 157-163
Author(s):  
Salah Bensadek ◽  
Hakim Aguedal ◽  
Abdelkader Iddou ◽  
Abdallah Aziz

The efficiency of bacterial biomass as an adsorbent for the removal of Chromium in a fixed column was the subject of this study. The effect of different parameters such as initial Cr (VI) concentrations (25, 50, and 100mg/L), flow rate (0.5, 0.75, and 1 mL/min), and bed depth (8, 16, and 24 cm) on Cr (VI) biosorption were investigated. The breakthrough data obtained for Cr (VI) removal was more adequately described by the Clark and Yan model with high correlation coefficients (R2 = 0,996). According to the results obtained, fixed bacterial biomass was estimated as possible biosorbent for removal of chromium (VI) from aqueous solutions in a dynamic process.


2020 ◽  
Vol 85 ◽  
pp. 131-139
Author(s):  
S Shen ◽  
Y Shimizu

Despite the importance of bacterial cell volume in microbial ecology in aquatic environments, literature regarding the effects of seasonal and spatial variations on bacterial cell volume remains scarce. We used transmission electron microscopy to examine seasonal and spatial variations in bacterial cell size for 18 mo in 2 layers (epilimnion 0.5 m and hypolimnion 60 m) of Lake Biwa, Japan, a large and deep freshwater lake. During the stratified period, we found that the bacterial cell volume in the hypolimnion ranged from 0.017 to 0.12 µm3 (median), whereas that in the epilimnion was less variable (0.016 to 0.033 µm3, median) and much lower than that in the hypolimnion. Additionally, in the hypolimnion, cell volume during the stratified period was greater than that during the mixing period (up to 5.7-fold). These differences in cell volume resulted in comparable bacterial biomass in the hypolimnion and epilimnion, despite the fact that there was lower bacterial abundance in the hypolimnion than in the epilimnion. We also found that the biomass of larger bacteria, which are not likely to be grazed by heterotrophic nanoflagellates, increased in the hypolimnion during the stratified period. Our data suggest that estimation of carbon flux (e.g. bacterial productivity) needs to be interpreted cautiously when cell volume is used as a constant parametric value. In deep freshwater lakes, a difference in cell volume with seasonal and spatial variation may largely affect estimations.


2015 ◽  
Vol 42 (2) ◽  
pp. 197-210 ◽  
Author(s):  
Laurence M. Cook

Joseph Sidebotham (1824–1885) was a Manchester cotton baron whose natural history collections are now in the Manchester Museum. In addition to collecting he suggested a method for identifying and classifying Lepidoptera and investigated variation within species as well as species limits. With three close collaborators, he is credited with discovering many species new to Britain in both Lepidoptera and Coleoptera. A suspicion of fraud attaches to these claims. The evidence is not clear-cut in the Lepidoptera, but a possible reason is suggested why Sidebotham, as an amateur in the increasingly professional scientific world, might have engaged in deceit.


Author(s):  
Hua Yao ◽  
Lan Guo ◽  
Bing-Hua Jiang ◽  
Jia Luo ◽  
Xianglin Shi
Keyword(s):  

2019 ◽  
Vol 4 (6) ◽  
pp. 316-320
Author(s):  
O. M. Buchko ◽  
◽  
V. V. Havryliak ◽  
A. Z. Pylypets ◽  
◽  
...  

Author(s):  
Md. Abu Sayem

The present paper attempts to expose how the scientific world-view of nature contributes to the present environmental crisis. Alongside this, it relates European Renaissance, humanism, secularism, the scientific and industrial revolutions, modern philosophy, scientism, technology-based modern life, consumerism-based modern society, etc. with current environmental problems. By focusing on Nasr’s traditional understanding of nature, the paper explores how materialistic and mechanistic world-views are deeply connected with the present ecological crisis. It also offers a critical analysis of Nasr’s spiritual and religious world-view of nature and examines its relevance. In doing so, it aims to highlight some demerits of the present world-view, and to call to reform current perceptions of nature by revitalizing traditional wisdom in order to protect the environment from further degradation. Thus, the paper is scholarly addition to the ongoing discourse on the issue of religions and the environment. Keywords: Eco-theology, Environmental Degradation, Materialistic and Mechanistic Views of Nature, Scientism, Spiritual Crisis of Modern humans, Religious and Spiritual World-Views.   Abstrak Kertas kajian ini menerangkan bagaimana pandangan saintifik telah menyumbang kepada krisis alam sekitar semasa. Disamping itu, kertas ini akan menhubungkaitkan Gerakan Revolusi Humanisma di Eropah, sekularisme, revolusi  sains dan perindustrian, falsafah moden, saintisme, kehidupan moden yang berasaskan teknologi, masyarakat moden yang berasaskan consumerisme, etc. dengan krisis alam sekitar yang berlaku dewasa ini.  Dengan memahami pandangan Nasr terhadap alam sekitar, kertas ini akan merungkai bagaimana pandangan materialistik (kebendaan) dan mekanistik mempengaruhi krisis ekologi masa kini. Ia juga akan menganalisa pandangan spiritual dan agama Nasr terhadap alam sekitar secara kritikal dan akan menilai sejauh mana kesesuaiannya. Dengan sedemikian dapat menyedarkan manusia tentang kecacatan pandangan semasa, yang kemudiannya akan membawa kepada pembaharuan persepsi mereka terhadap alam sekitar dengan cara menghidupkan semula nilai-nilai tradisional demi mengelakkan kemerosotan alam sekitar. Kertas ini akan memuatkan idea-idea para cendiakawan dalam membincangkan isu  berkaitan agama dan alam sekitar. Kata Kunci: Eko-Teologi, Kemerosotan Alam Sekitar, Pandangan Materialistik dan Makanistik terhadap Alam, Saintisme, Krisis Spiritual Manusia Moden, Perspektif Spiritual dan Agama.


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