Characterization of a novel fiber filtration system with a unique mechanism for adjusting the depth of the filter bed

2021 ◽  
Vol 42 ◽  
pp. 101897
Author(s):  
Tetsuro Ueyama ◽  
Kha H. Nguyen ◽  
Tomoaki Itayama
Keyword(s):  
Filtration System ◽  
Filter Bed ◽  
Unique Mechanism

scholarly journals Characterization of the Unique Mechanism Mediating the Shear-dependent Binding of Soluble von Willebrand Factor to Platelets

1995 ◽  
Vol 270 (40) ◽  
pp. 23352-23361 ◽  
Author(s):  
Shinya Goto ◽  
Daniel R. Salomon ◽  
Yasuo Ikeda ◽  
Zaverio M. Ruggeri
Keyword(s):  
Von Willebrand Factor ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Unique Mechanism

scholarly journals Microbiological and Physicochemical Characterization of Hospital Effluents before and after Treatment with Two Types of Sawdust

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Rabea Elmountassir ◽  
Bahia Bennani ◽  
Youssef Miyah ◽  
Ahlam Fegousse ◽  
Ghita El Mouhri ◽  
...  
Keyword(s):  
Physicochemical Characterization ◽  
Oxygen Demand ◽  
Fecal Coliforms ◽  
World Health ◽  
Hospital Effluents ◽  
Before And After ◽  
Health Organization ◽  
Filter Bed ◽  
Microbiological Analyses

Physicochemical and microbiological analyses of liquid hospital effluents have demonstrated that they are loaded with organic and inorganic pollutants then discharged into the sewerage networks without treatment. The aim of this study is to suggest an effective solution for their treatment. Column filtration is an adequate method to reduce the pollutant load which makes it possible to have a rate of abatement of 97% and 79% by filtering the pollutant material using sawdust of catia and red sawdust, respectively, with a filter bed height equal to 13 cm. Physicochemical parameters such as chemical oxygen demand, biological oxygen demand, nitrate, ammonia, phosphorus, electrical conductivity and the bacteriological parameters like fecal coliforms, Streptococci, and Staphylococci have been measured. The analysis of heavy metals displays compliance with the World Health Organization standards. The red sawdust and catia sawdust have been characterized by scanning electron microscopy and Fourier-transform infrared spectroscopy.

scholarly journals Src family kinases-mediated negative regulation of sperm acrosome reaction in chickens (Gallus gallus domesticus)

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0241181
Author(s):  
Chathura Priyadarshana ◽  
Rangga Setiawan ◽  
Atsushi Tajima ◽  
Atsushi Asano
Keyword(s):  
Acrosome Reaction ◽  
Tyrosine Phosphatase ◽  
Functional Characterization ◽  
Src Family Kinases ◽  
Prolonged Storage ◽  
Phosphatase Inhibitors ◽  
Calcium Dependent ◽  
Mammalian Sperm ◽  
Unique Mechanism

The acrosome reaction (AR) is a strictly-regulated, synchronous exocytosis that is required for sperm to penetrate ova. This all-or-nothing process occurs only once in the sperm lifecycle through a sequence of signaling pathways. Spontaneous, premature AR therefore compromises fertilization potential. Although protein kinase A (PKA) pathways play a central role in AR across species, the signaling network used for AR induction is poorly understood in birds. Mechanistic studies of mammalian sperm AR demonstrate that PKA activity is downstreamly regulated by Src family kinases (SFKs). Using SFK inhibitors, our study shows that in chicken sperm, SFKs play a role in the regulation of PKA activity and spontaneous AR without affecting motility. Furthermore, we examined the nature of SFK phosphorylation using PKA and protein tyrosine phosphatase inhibitors, which demonstrated that unlike in mammals, SFK phosphorylation in birds does not occur downstream of PKA and is primarily regulated by calcium-dependent tyrosine phosphatase activity. Functional characterization of SFKs in chicken sperm showed that SFK activation modulates the membrane potential and plays a role in inhibiting spontaneous AR. Employing biochemical isolation, we also found that membrane rafts are involved in the regulation of SFK phosphorylation. This study demonstrates a unique mechanism for regulating AR induction inherent to avian sperm that ensure fertilization potential despite prolonged storage.

scholarly journals Peat water treatment using oxidation and physical filtration system and its performance in reducing iron (Fe), turbidity, and color

2020 ◽  
Vol 148 ◽  
pp. 07011
Author(s):  
Nur Novilina Arifianingsih ◽  
Yuniati Zevi ◽  
Qomarudin Helmy ◽  
Suprihanto Notodarmojo ◽  
Hirofumi Fujita ◽  
...  
Keyword(s):  
Water Treatment ◽  
Iron Content ◽  
Iron Reduction ◽  
Catalytic Process ◽  
High Iron ◽  
Filtration System ◽  
Two Samples ◽  
Reduction Efficiency ◽  
Standard Limit

This research was conducted to treat peat water using oxidation and physical filtration system. Initially, the characterization of peat water was determined by three parameters, including iron (Fe), turbidity, and color. These three parameters exhibited values that exceeded the water standard limit. This study used two samples consisting of high and low iron content. Both samples were treated using NaClO for the oxidation-catalytic process and Manganese sand for the filter. The trial time is 67 minutes by calculating the value of each parameter every 10 minutes. The result shows different performance in the sample with low iron and high iron. In the sample with low iron (0.32 mg/l), the efficiency of reducing iron is 65.62%, the efficiency of reducing turbidity is 78.95% and the efficiency of reducing color is 78.77%. The results obtained showed differences in samples with high iron (6.75 mg / l). Iron reduction efficiency is 29.17%, turbidity reduction efficiency is 69.05% and color reduction efficiency is 61.32%.

scholarly journals Synthesize and Characterization of Rice Husk Silica to Remove the Hydrogen Sulfide through the Physical Filtration System

2011 ◽  
Vol 4 (3) ◽  
pp. 246-254 ◽  
Author(s):  
Seyed Mahmoud Mehdinia ◽  
Puziah Abdul Latif ◽  
Ahmad Makmom Abdullah ◽  
Hassan Taghipour
Keyword(s):  
Hydrogen Sulfide ◽  
Rice Husk ◽  
Rice Husk Silica ◽  
Filtration System

scholarly journals Performance of Sand Filtration System with Different Sand Bed Depth for Polishing Wastewater Treatment

2021 ◽  
Vol 9 (2) ◽  
pp. 451-456
Keyword(s):  
Filtration Rate ◽  
Cost Effective ◽  
Treatment Method ◽  
Total Coliform ◽  
Contaminant Removal ◽  
Sand Filtration ◽  
Sand Filter ◽  
Conventional Activated Sludge ◽  
Filtration System ◽  
Filter Bed

Sand filtration is a polishing type of treatment system that is widely used as an efficient, cost-effective and simple treatment method. The efficiency of sand filtration relies mainly on the capacity of sand bed depth. Different sand bed depth affects the filtration rate and the contaminant removal differently. Hence, this study aims to investigate the effect of different sand media depth on the removal efficiency of the filtration process. An experimental sand filter with three design modifications of different sand bed depth, 30 cm, 60 cm, and 90 cm, was operated as polishing stage of an effluent from conventional activated sludge process. The highest filtration rate was recorded using sand depth of 30 cm. Higher filter bed depth result in lower filter rate which result in smaller filtrate volume. Highest E. Coli and COD removal, are 95.5% and 52.2%, respectively, recorded using 30 cm sand depth. Meanwhile, highest TSS and turbidity removal are 91.0% and 77.3%, respectively, with sand depth of 90 cm. Highest total coliform and BOD removal are 88.3% and 68.0% respectively by using sand depth of 60 cm. This study demonstrated that the sand filter is more efficient in removing suspended contaminants and coliforms compared to removing dissolved contaminants.

scholarly journals Store-Operated Calcium Channels

2015 ◽  
Vol 95 (4) ◽  
pp. 1383-1436 ◽  
Author(s):  
Murali Prakriya ◽  
Richard S. Lewis
Keyword(s):  
Calcium Channels ◽  
Molecular Mechanisms ◽  
Major Pathway ◽  
Surface Receptors ◽  
Store Operate Calcium Entry ◽  
Channel Properties ◽  
Structural Insights ◽  
Unique Mechanism ◽  
Stimulation Of

Store-operated calcium channels (SOCs) are a major pathway for calcium signaling in virtually all metozoan cells and serve a wide variety of functions ranging from gene expression, motility, and secretion to tissue and organ development and the immune response. SOCs are activated by the depletion of Ca2+ from the endoplasmic reticulum (ER), triggered physiologically through stimulation of a diverse set of surface receptors. Over 15 years after the first characterization of SOCs through electrophysiology, the identification of the STIM proteins as ER Ca2+ sensors and the Orai proteins as store-operated channels has enabled rapid progress in understanding the unique mechanism of store-operate calcium entry (SOCE). Depletion of Ca2+ from the ER causes STIM to accumulate at ER-plasma membrane (PM) junctions where it traps and activates Orai channels diffusing in the closely apposed PM. Mutagenesis studies combined with recent structural insights about STIM and Orai proteins are now beginning to reveal the molecular underpinnings of these choreographic events. This review describes the major experimental advances underlying our current understanding of how ER Ca2+ depletion is coupled to the activation of SOCs. Particular emphasis is placed on the molecular mechanisms of STIM and Orai activation, Orai channel properties, modulation of STIM and Orai function, pharmacological inhibitors of SOCE, and the functions of STIM and Orai in physiology and disease.

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