The further chemistry of ellagic acid III: The effect of wick action upon moisture uptake and movement in ellagate treated Pinus radiata wood
- Authors: Przewloka, Simon , Shearer, B. J.
- Date: 2002
- Type: Text , Journal article
- Relation: Holzforschung Vol. 56, no. 6 (2002), p. 632-638
- Full Text: false
- Reviewed:
- Description: Pinus radiata sapwood stakes were treated with ellagic acid and tetraguanidinium, tetracholine and tetrakis-benzyltrimethylammonium ellagates. The effect of these treatments upon moisture movement and uptake was investigated by wick action. Given that chemical reactions within the wood substrate between nutrients and treatment solutions may alter the properties of the wood with regard to moisture movement, the presence of Cu2+ in the system was also examined. Water-soluble ellagates reduced water loss by 25-35 %, but had no effect upon water uptake. Ellagic acid in N-methylpyrrolidone significantly reduced both water loss and moisture uptake. The effect of Cu2+ upon moisture movement and uptake in the treated stakes was negligible.
- Description: 2003000162
Physicochemical and functional properties of lentil protein isolates prepared by different drying methods
- Authors: Joshi, Matina , Adhikari, Benu , Aldred, Peter , Panozzo, Joe , Kasapis, Stefan
- Date: 2011
- Type: Text , Journal article
- Relation: Food Chemistry Vol. 129, no. 4 (2011), p. 1513-1522
- Full Text: false
- Reviewed:
- Description: Lentil protein isolate (LPI) extract was converted into powder by freeze drying, spray drying and vacuum drying. Differences in particle size distribution, protein subunit composition and colour and surface morphology were observed amongst the three drying methods. Spray and freeze-dried LPI powders exhibited higher solubility (81% and 78%, respectively) compared to vacuum dried powders (50%). The spray dried powders showed a low water absorption capacity (0.43 ± 0.02 g/g) compared to freeze (0.48 ± 0.02 g/g) and vacuum-dried (0.47 ± 0.01 g/g) LPI powders. Spray and freeze-dried powders displayed better gelation ability and higher gel strength, compared to vacuum-dried powder. Both spray and freeze-dried gels showed typical viscoelastic gel characteristics, with G′ dominating over G″ and very low loss tangent. The holding time required for gelation of vacuum dried powder at 90 °C was significantly longer, compared to spray and freeze dried powders. Hence, drying methods used for preparation of lentil protein isolate powders can affect physicochemical and associated functional properties. © 2011 Elsevier Ltd. All rights reserved.
Bio-reinforced self-healing concrete using magnetic iron oxide nanoparticles
- Authors: Seifan, Mostafa , Sarmah, Ajit , Ebrahiminezhad, Alireza , Ghasemi, Younes , Samani, Ali Khajeh , Berenjian, Aydin
- Date: 2018
- Type: Text , Journal article
- Relation: Applied Microbiology and Biotechnology Vol. 102, no. 5 (2018), p. 2167-2178
- Full Text: false
- Reviewed:
- Description: Immobilization has been reported as an efficient technique to address the bacterial vulnerability for application in bio self-healing concrete. In this study, for the first time, magnetic iron oxide nanoparticles (IONs) are being practically employed as the protective vehicle for bacteria to evaluate the self-healing performance in concrete environment. Magnetic IONs were successfully synthesized and characterized using different techniques. The scanning electron microscope (SEM) images show the efficient adsorption of nanoparticles to the Bacillus cells. Microscopic observation illustrates that the incorporation of the immobilized bacteria in the concrete matrix resulted in a significant crack healing behavior, while the control specimen had no healing characteristics. Analysis of bio-precipitates revealed that the induced minerals in the cracks were calcium carbonate. The effect of magnetic immobilized cells on the concrete water absorption showed that the concrete specimens supplemented with decorated bacteria with IONs had a higher resistance to water penetration. The initial and secondary water absorption rates in bio-concrete specimens were 26% and 22% lower than the control specimens. Due to the compatible behavior of IONs with the concrete compositions, the results of this study proved the potential application of IONs for developing a new generation of bio self-healing concrete.
Freeze–thaw resistance and sorptivity of fine-grained alkali-activated cement concrete
- Authors: Tekle, Biruk , Ly, Tran , Hertwig, Ludwig , Holschemacher, Klaus
- Date: 2023
- Type: Text , Journal article
- Relation: Structural Concrete Vol. 24, no. 3 (2023), p. 4286-4296
- Full Text:
- Reviewed:
- Description: The paper investigates the freeze–thaw resistance and sorptivity behavior of fine-grained alkali-activated concrete cured at ambient temperature. A blended binder system containing fly ash, ground granulated blast furnace slag, and silica fume was used. A combination of sodium hydroxide and sodium silicate was used as an activator. The freeze–thaw resistance was evaluated based on mass loss (scaling), and the extent of internal damage was assessed by testing the ultrasonic time at different cycles. Initial and secondary sorptivity coefficients were calculated based on the cumulative water absorption values at different time intervals. Alkali content, sodium silicate to sodium hydroxide ratio, and water to binder ratio were investigated. The experimental results showed that water to binder ratio is the most significant parameter for the scaling; higher ratios result in higher scaling. In terms of internal damage, alkali content is the most significant. The increase of alkali increased the amount of internal damage in the concrete. The initial sorptivity coefficient increased with the water and alkali content and decreased with the silicate content. The secondary sorptivity coefficient showed no significant change with the investigated parameters. © 2022 The Authors. Structural Concrete published by John Wiley & Sons Ltd on behalf of International Federation for Structural Concrete.
Dunnies and the Australian culture: looking backward and forward to explicate community memory
- Authors: Newton, Janice
- Date: 2007
- Type: Text , Journal article
- Relation: Journal of Australian Studies Vol. 91, no. (2007), p. 81-91
- Full Text:
- Reviewed:
- Description: In 2002, Dunnedoo, in New South Wales, by-passed the graceful imagery of the Aboriginal meaning of their home, 'Black Swan', to propose a giant 'dunny' as a tourist attraction for their town. This study explores why Australians have a particular relationship to the dunny and, in doing so, attempts to merge some theoretical insights of oral historiography and symbolic anthropology.
- Description: C1
- Description: 2003005735