Entity

Time filter

Source Type

Tateyama, Japan

Nasser R.A.,King Saud University | Nasser R.A.,Alexandria University | Al-Mefarrej H.A.,King Saud University | Abdel-Aal M.A.,King Saud University | And 2 more authors.
Journal of Environmental Biology | Year: 2014

This study investigated the possibility of using the prunings of six locally grown tree species in Saudi Arabia for cement-bonded particleboard (CBP) production. Panels were made using four different wood particle sizes and a constant wood/cement ratio (1/3 by weight) and target density (1200 kg/m3). The mechanical properties and dimensional stability of the produced panels were determined. The interfacial area and distribution of the wood particles in cement matrix were also investigated by scanning electron microscopy. The results revealed that the panels produced from these pruning materials at a target density of 1200 kg m-3meet the strength and dimensional stability requirements of the commercial CBP panels. The mean moduli of rupture and elasticity (MOR and MOE) ranged from 9.68 to 11.78 N mm2and from 3952 to 5667 N mm2, respectively. The mean percent water absorption for twenty four hours (WA24) ranged from 12.93% to 23.39%. Thickness swelling values ranged from 0.62% to 1.53%. For CBP panels with high mechanical properties and good dimensional stability, mixed-size or coarse particles should be used. Using the tree prunings for CBPs production may help to solve the problem of getting rid of these residues by reducing their negative effects on environment, which are caused by poor disposal of such materials through direct combustion process and appearance of black cloud and then the impact on human health or the random accumulation and its indirect effects on the environment. © Triveni Enterprises. Source


Esmaiel N.M.,Horticulture Institute | Al-Doss A.A.,King Saud University | Barakat M.N.,King Saud University | Barakat M.N.,Alexandria University
Journal of Food, Agriculture and Environment | Year: 2013

Ten cultivars of carnation (Dianthus caryophyllus L.) were screened by using leaf base explants and four media, for their capability of callus induction, embryogenic callus and plant regeneration. The results indicated that all in vitro culture traits were significantly influenced by the differences in cultivars and media. The two-way interaction was also highly significant. The percentage of explants that developed calli ranged from 78.3% ('Lia') to 58.6% ('Farida'). MS medium supplemented with 0.5 mg/l of NAA + 0.5 mg/l of BAP (Medium B) and medium supplemented with 0.01 mg/l of NAA + 1.0 mg/l of BAP (Medium C) gave the highest average of callus induction. The cultivar Banyas produced the highest callus weight with medium A, B and C on the other hand, the cultivar Miledy produced the highest callus weight with medium D. The highest percentage of embryogenic callus resulted from 'Miledy' cultivar. The percentage of root formation ranged from 0.0% ('Miledy') to 40.0% ('White Liberty'). Results also showed that the cultivars Lia and White Liberty produced the highest mean values of shoot formation (15.5 and 13.8%, respectively) when calli differentiated on MS medium supplemented with 0.2 mg/l NAA and 1.0 mg/l BAP. Source


Esmaiel N.M.,Horticulture Institute | Abdellateif K.F.,University of Sadat City | Mahmoud Eldemery S.M.,University of Sadat City | Zakri A.M.,King Saud University | And 3 more authors.
Journal of Food, Agriculture and Environment | Year: 2014

This study was conducted to characterize and detect genetic relatedness among 21 ornamental species of the genus Ficus grown in Alexandria, Egypt, using the powerful combination of morphological and EST molecular markers. Results of the two-way hierarchical cluster analysis of the 21 Ficus species and the morphological traits indicated that the twelve morphological traits were separated into two main clusters in the first way of hierarchical clustering, while, in the other way of the two-way hierarchical cluster analysis, the Ficus species were distributed according to this analysis into five clusters. The relationships among the 21 Ficus species were estimated by a UPGMA cluster analysis of genetic similarity matrices. Cluster analysis using EST data grouped the 21 Ficus species into four main clusters with simple matching (SM) similarity coefficient ranging from 0.56 to 0.99. The highest similarity was found between F. altissima and F. laurifolia (0.99), which have also very high value of similarity according to the morphological traits analysis, and the lowest similarity was obtained between F. altissima and F. afzelii (0.56). The polymorphic information content (PIC) per primer pairs ranged from 0.78 to 0.89 with an average of 0.84. PIC values were positively correlated (r = 0.61) with number of amplified alleles per primer. Source


Nasser R.A.,King Saud University | Nasser R.A.,Alexandria University | Salem M.Z.M.,Alexandria University | Al-Mefarrej H.A.,King Saud University | And 4 more authors.
BioResources | Year: 2014

Seven varieties of vine prunings (Vitis vinifera L.) grown under Riyadh conditions were considered as renewable sources for fuelwood. Significant effects (P<0.01) were found for total extractives, benzene-ethanol extractives, cellulose, hemicellulose, lignin, cold water solubility, and hot water solubility among the seven vine varieties. Highly significant positive correlations (P<0.01) were observed between the higher heating value (HHV) and benzene-ethanol extractives (r=0.74) and lignin content (r=0.94). Additionally, elemental composition (C, H, N, O, and S) exhibited a significant effect on HV (P<0.01) and ash content of the seven vine varieties. There were highly significant positive correlations (P<0.01) between the HV and C (r=0.96) and H (r=0.93). Ash content showed a highly significant effect (P<0.01) on HV with a negative coefficient (r=-0.93). The heating value of vine prunings ranged from 18.74 to 19.19 MJ/kg, i.e. higher than some well-known biomass fuels. The results suggested that the vine prunings could be suitable as a source for energy production in Saudi Arabia. Source


Esmaiel N.M.,Horticulture Institute | Elshafei A.A.,King Saud University | Elshafei A.A.,National Research Center of Egypt | Zakri A.M.,King Saud University | And 3 more authors.
Journal of Food, Agriculture and Environment | Year: 2014

A protocol is established for shoot regeneration of the threatened plants, Lagunaria patersonii, using lateral bud and shoot tip explants. Lateral bud and shoot tip explants were regenerated directly into shoots on Murashige and Skoog medium free growth regulators. The micro-propagated plantlets as well as mother plant were subjected to the target region amplification polymorphism (TRAP) and simple sequence repeat (SSR) analyses to assess the genetic stability of micro-propagated plantlets of Lagunaria. Twenty micro-propagated plantlets were chosen from a clonal collection of shoots that originated from a single mother plant. Out of 20 TRAP and 30 SSR primers screened, 20 TRAP and 28 SSR primers were found to produce clear, reproducible bands resulting in a total of 66 and 65 distinct bands, respectively, 93.2% and 73.4% were not polymorphic for TRAP and SSR analyses, respectively, among the Lagunaria patersonii and 20 in vitro generated clones. Based on the TRAP band data, similarity indicators between the progenies and the mother ranged from 0.95 to 1.0 and the polymorphic bands comprised 2.4% of the total scored genetic loci with TRAP analysis which indicates that this micro-propagated line of Lagunaria patersonii is genetically stable. A total of 1309 scorable bands were obtained from the full combination of SSR primers and plantlets and only 98 (7.49%) were polymorphic across the plantlets which indicated that the micro-propagated Lagunaria patersonii is genetically stable. Source

Discover hidden collaborations