scholarly journals The Bionic Water Channel of Ultra-Short, High Affinity Carbon Nanotubes with High Water Permeability and Proton Selectivity

2020 ◽  
Vol 13 (1) ◽  
pp. 102
Author(s):  
Guangli Liu ◽  
Bin Zhou ◽  
Jinwei Liu ◽  
Huazhang Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Water Permeability ◽  
Lipid Membrane ◽  
Ion Selectivity ◽  
Biological Membrane ◽  
Water Channel ◽  
High Water ◽  
Structural Features ◽  
High Affinity ◽  
Salt Ions

The development of the bionic water channel aims to replace the possible use of natural aquaporins (AQPs) for water purification, while retaining the ability of natural AQPs to carry out ultra-fast water transport and repel ions. Carbon nanotube channels (CNTCs) are a convenient membrane-based model system for studying nano-fluidic transport that replicates a number of key structural features of biological membrane channels. In this report, we describe protocols for CNTCs synthesis by ultrasound-assisted cutting of long CNTs in the presence of lipid amphiphiles. CNTCs have a similar thickness to the lipid membrane and high affinity for it. The ultra-short high-affinity CNTCs have high permeability and ion selectivity. The water permeability of the CNTCs is 1936 ± 123 μm/s, which is 2.3 times that of natural AQPs, and completely rejects salt ions. In general, carbon nanotubes represent a multifunctional nanopore building module for creating high-ranking functional bionic materials. This study has reference significance for the design of new bionic water channel and the actual development of bionic membrane based on CNTs.

scholarly journals Comment on “Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins”

Science ◽  
2018 ◽  
Vol 359 (6383) ◽  
pp. eaap9173 ◽  
Author(s):  
Andreas Horner ◽  
Peter Pohl
Keyword(s):  
Activation Energy ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Water Transport ◽  
Water Permeability ◽  
Ion Selectivity ◽  
Membrane Interface ◽  
Single File ◽  
Lower Activation ◽  
Lower Activation Energy

Tunuguntla et al. (Reports, 25 August 2017, p. 792) report that permeation of single-file water occurs faster through carbon nanotubes than through aquaporins. We show that this conclusion violates fundamental thermodynamic laws: Because of its much lower activation energy, aquaporin-mediated water transport must be orders of magnitude faster. Leakage at the nanotube-membrane interface may explain the discrepancy.

Vasopressin increases AQP-CD water channel in apical membrane of collecting duct cells in Brattleboro rats

1995 ◽  
Vol 268 (6) ◽  
pp. C1546-C1551 ◽  
Author(s):  
T. Yamamoto ◽  
S. Sasaki ◽  
K. Fushimi ◽  
K. Ishibashi ◽  
E. Yaoita ◽  
...  
Keyword(s):  
Water Permeability ◽  
Apical Membrane ◽  
Collecting Duct ◽  
Basolateral Membrane ◽  
Water Channel ◽  
High Water ◽  
Brattleboro Rats ◽  
Duct Cells ◽  
Cytoplasmic Vesicles ◽  
Collecting Duct Cells

The effect of vasopressin on subcellular localization of AQP-CD and AQP3 water channels was examined in thirsted Brattleboro rats by immunohistochemistry and immunoelectron microscopy. AQP-CD was mainly present in the cytoplasm of the collecting duct cells in association with cytoplasmic vesicles but was sparse in the apical membrane in control vehicle-injected rats. In rats given vasopressin 15 min before death, the number of immunogold particles for AQP-CD in the apical membrane increased significantly (P < 0.002) from 1.8 +/- 0.2 to 10.0 +/- 0.4/microns with a significant decrease (P < 0.05) of cytoplasmic labeling from 32.6 +/- 6.4 to 24.6 +/- 5.6/microns 2, indicating that AQP-CD is the vasopressin-regulated water channel predicted by the “shuttle” hypothesis. In contrast, AQP3 was restricted to the basolateral membrane of the collecting duct cells, and the labeling density of AQP3 was unchanged by vasopressin treatment, indicating that AQP3 is constitutively expressed and may maintain high water permeability of the basolateral membrane.

scholarly journals Response to Comment on “Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins”

Science ◽  
2018 ◽  
Vol 359 (6383) ◽  
pp. eaaq1241 ◽  
Author(s):  
Ramya H. Tunuguntla ◽  
Yuliang Zhang ◽  
Robert Y. Henley ◽  
Yun-Chiao Yao ◽  
T. Anh Pham ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Experimental Evidence ◽  
Water Transport ◽  
Water Permeability ◽  
Transport Mechanism ◽  
Ion Selectivity ◽  
High Water ◽  
Arrhenius Factor ◽  
Rule Out

Horner and Pohl argue that high water transport rates reported for carbon nanotube porins (CNTPs) originate from leakage at the nanotube-bilayer interface. Our results and new experimental evidence are consistent with transport through the nanotube pores and rule out a defect-mediated transport mechanism. Mechanistic origins of the high Arrhenius factor that we reported for narrow CNTPs at pH 8 require further investigation.

Enhancing Water Permeability with Super-hydrophilic Metal-Organic Frameworks and Hydrophobic Straight Pores

2021 ◽  
Author(s):  
Mehdi Habibollahzadeh ◽  
Juran Noh ◽  
Liang Feng ◽  
Hong-Cai Zhou ◽  
Ahmed Abdel-Wahab ◽  
...  
Keyword(s):  
Osmotic Pressure ◽  
Water Permeability ◽  
Metal Organic Frameworks ◽  
Water Flux ◽  
Forward Osmosis ◽  
High Water ◽  
Metal Organic

High water flux and salt selectivity have been the most demanding goals for osmosis-based membranes. Osmotic pressure differences across membranes are particularly important in emerging forward osmosis and pressure retarded...

scholarly journals Cellulose Nanofibrils/Xyloglucan Bio-Based Aerogels with Shape Recovery

Gels ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 5
Author(s):  
Samuel Mandin ◽  
Samuel Moreau ◽  
Malika Talantikite ◽  
Bruno Novalès ◽  
Jean-Eudes Maigret ◽  
...  
Keyword(s):  
Water Absorption ◽  
Shape Recovery ◽  
Cellulose Nanofibrils ◽  
High Water ◽  
Absorption Capacity ◽  
Absorption Properties ◽  
High Affinity ◽  
High Water Absorption ◽  
Freezing Procedure ◽  
The Impact

Bio-based aerogels containing cellulose nanofibrils (CNFs) are promising materials due to the inherent physical properties of CNF. The high affinity of cellulose to plant hemicelluloses (xyloglucan, xylan, pectin) is also an opportunity to develop biomaterials with new properties. Here, we prepared aerogels from gelled dispersions of CNFs and xyloglucan (XG) at different ratios by using a freeze-casting procedure in unidirectional (UD) and non-directional (ND) manners. As showed by rheology analysis, CNF and CNF/XG dispersions behave as true gels. We investigated the impact of the freezing procedure and the gel’s composition on the microstructure and the water absorption properties. The introduction of XG greatly affects the microstructure of the aerogel from lamellar to cellular morphology. Bio-based aerogels showed high water absorption capacity with shape recovery after compression. The relation between morphology and aerogel compositions is discussed.

scholarly journals Transepithelial water and urea permeabilities of isolated perfused Munich-Wistar rat inner medullary thin limbs of Henle's loop

2014 ◽  
Vol 306 (1) ◽  
pp. F123-F129 ◽  
Author(s):  
C. Michele Nawata ◽  
Kristen K. Evans ◽  
William H. Dantzler ◽  
Thomas L. Pannabecker
Keyword(s):  
Water Channel ◽  
Wistar Rat ◽  
Structural Features ◽  
Urea Transporter ◽  
Outer Medulla ◽  
Aquaporin 1 ◽  
Passive Mechanism ◽  
Short Loop ◽  
Osmotic Water ◽  
Gene Expression Levels

To better understand the role that water and urea fluxes play in the urine concentrating mechanism, we determined transepithelial osmotic water permeability ( Pf) and urea permeability ( Purea) in isolated perfused Munich-Wistar rat long-loop descending thin limbs (DTLs) and ascending thin limbs (ATLs). Thin limbs were isolated either from 0.5 to 2.5 mm below the outer medulla (upper inner medulla) or from the terminal 2.5 mm of the inner medulla. Segment types were characterized on the basis of structural features and gene expression levels of the water channel aquaporin 1, which was high in the upper DTL (DTLupper), absent in the lower DTL (DTLlower), and absent in ATLs, and the Cl-1 channel ClCK1, which was absent in DTLs and high in ATLs. DTLupper Pf was high (3,204.5 ± 450.3 μm/s), whereas DTLlower showed very little or no osmotic Pf (207.8 ± 241.3 μm/s). Munich-Wistar rat ATLs have previously been shown to exhibit no Pf. DTLupper Purea was 40.0 ± 7.3 × 10−5 cm/s and much higher in DTLlower (203.8 ± 30.3 × 10−5 cm/s), upper ATL (203.8 ± 35.7 × 10−5 cm/s), and lower ATL (265.1 ± 49.8 × 10−5 cm/s). Phloretin (0.25 mM) did not reduce DTLupper Purea, suggesting that Purea is not due to urea transporter UT-A2, which is expressed in short-loop DTLs and short portions of some inner medullary DTLs close to the outer medulla. In summary, Purea is similar in all segments having no osmotic Pf but is significantly lower in DTLupper, a segment having high osmotic Pf. These data are inconsistent with the passive mechanism as originally proposed.

Bioresponse to Nanotubes: Surface Chemistry of Carbon Nanotubes Impacts the Growth and Expression of Water Channel Protein in Tomato Plants (Small 15/2012)

Small ◽  
2012 ◽  
Vol 8 (15) ◽  
pp. 2327-2327
Author(s):  
Hector Villagarcia ◽  
Enkeleda Dervishi ◽  
Kanishka de Silva ◽  
Alexandru S. Biris ◽  
Mariya V. Khodakovskaya
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Water Channel ◽  
Tomato Plants ◽  
Channel Protein ◽  
Water Channel Protein

Evaluation of some physical performance properties of ultrasonic seaming, conventional seaming and sealing adhesive tape on waterproof polyester knitted fabrics with polyurethane

2021 ◽  
pp. 004051752110388
Author(s):  
Ayşe Şevkan Macit ◽  
Bahar Tiber
Keyword(s):  
Water Permeability ◽  
High Water ◽  
The Other ◽  
Adhesive Tape ◽  
Water Penetration ◽  
Performance Property ◽  
Knitted Fabrics ◽  
Bursting Strength ◽  
Bending Property ◽  
Bending Length

Ultrasonic seaming has become an important issue in recent years due to its various features. In this study, waterproof polyester knitted fabrics with polyurethane coating were used and the bursting strength, bending property and water permeability property of ultrasonic seaming were examined by changing various parameters. Besides, the ultrasonic seaming method was compared to conventional seaming and adhesive tape application. It is observed that there were high water permeability values generally in ultrasonic seaming and also fabrics with no water penetration were seen in this method, although, in some ultrasonic seaming parameters, values are lower than adhesive tape sealed ones. On the other hand, the bursting strength values of the ultrasonically sewn fabrics are found to be comparable to conventional seam and sealing adhesive tape when the optimum seaming parameters are determined. Also, it can be said that for the bending property according to increasing bending length values in this method compared with the others, ultrasonic seaming may find more usage areas where fabric stiffness is more advantageous. It has been observed that it is important to determine the fabric and ultrasonic sewing parameters according to the required performance property.

Progesterone inhibition of water permeability in Bufo arenarum oocytes and urinary bladder

1996 ◽  
Vol 270 (5) ◽  
pp. F880-F885 ◽  
Author(s):  
P. Ford ◽  
G. Amodeo ◽  
C. Capurro ◽  
C. Ibarra ◽  
R. Dorr ◽  
...  
Keyword(s):  
Urinary Bladder ◽  
Xenopus Laevis ◽  
Water Permeability ◽  
Water Channel ◽  
Water Channels ◽  
Toad Urinary Bladder ◽  
Osmotic Permeability ◽  
Bufo Arenarum ◽  
Mrna Extraction

The ovarian oocytes from Bufo arenarum (BAO) but not those from Xenopus laevis (XLO) would have water channels (WC). We now report that the injection of the mRNA from BAO into the oocytes from XLO increased their water osmotic permeability (Pi) (reduced by 0.3 mM HgCl2 and reversed by 5 mM beta-mercaptoethanol). A 30-min challenge with progesterone induced, 18 h later, a reduction of the mercury-sensitive fraction of Pf in the BAO (but not in XLO). The mRNA from BAO pretreated with progesterone lost its capacity to induce WC in the XLO, but the hormone did not affect the expression of the WC in XLO previously injected with the mRNA from BAO. Pf was also measured in urinary bladders of BAO. Eighteen hours after a challenge with progesterone, a reduction in the hydrosmotic response to oxytocin was observed. Finally, the mRNA from the urinary bladder of BAO was injected into XLO. An increase in Pf was observed. This was not the case if, before the mRNA extraction, the bladders were treated with progesterone. We conclude that the BAO WC share progesterone sensitivity with the oxytocin-regulated water channel present in the toad urinary bladder.

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