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Strength Performance and Microstructure Characteristic of Naturally-Bonded Fiberboard Composite from Malaysian Bamboo(Bambusa vulgaris)

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Journal of Renewable Materials 2022年第10期10卷 2581-2591页

作者： Shahril Anuar Bahari Mohd Nazarudin Zakaria Syaiful Osman falah abu Mohamad Jani Saad Reza Hosseinpourpia Eco-Technology Program Faculty of Applied SciencesUniversiti Teknologi MARA(UiTM)Shah Alam40450Malaysia Engineering Research Centre Malaysian Agricultural Research and Development Institute(MARDI)Serdang43400Malaysia Department of Forestry and Wood Technology Linnaeus UniversityVäxjö35195Sweden

This study investigated the mechanical properties and microstructural characteristics of fiberboard composite produced by naturally-bonded Malaysian bamboo fiber(Bambusa vulgaris).The components that obtained through soda pulping of bamboo culms such as fiber and black liquor,were used for the preparation of high-density fibreboard composite at two target densities of 850 and 950 kg/m^(3).The bamboo fiberboard composite(BFC)were then produced at 200°C and two pressing parameters of 125 and 175 s/*** mechanical properties,e.g.,flexural strength and internal bonding(IB)of BFC samples were evaluated according to BS EN 310:1993 and BS EN 319:1993,*** was found that the mechanical performance of the composite with 850 kg/m^(3)density was significantly higher than 950 kg/m^(3)ones,especially for the samples with 125 s/mm pressing *** characteristic of the BFC samples illustrated that the fiber linkages were cracked in the composites with higher density,e.g.,the composite with the density of 950 kg/m^(3)and also black liquor were slightly degraded at longer pressing time,which led to the reduction in mechanical properties,especially in IB strength.

关键词： Bamboo fiber naturally-bonded black liquor mechanical properties SEM composite

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Advancing male age differentially alters levels and localization patterns of PLCzeta in sperm and testes from different mouse strains

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Asian Journal of Andrology 2021年第2期23卷 178-187页

作者： Junaid Kashir Bhavesh V Mistry Maha Adel Gumssani Muhammad Rajab Reema abu-Dawas falah AlMohanna Michail Nomikos Celine Jones Raed abu-Dawud Nadya Al-Yacoub Kevin Coward F Anthony Lai Abdullah M Assiri College of Medicine Alfaisal UniversityRiyadh 11533Saudi Arabia Department of Comparative Medicine King Faisal Specialist Hospital and Research CentreRiyadh 11211Saudi Arabia College of Medicine QU HealthQatar UniversityDoha PO Box 2713Qatar Nuffield Department of Women’s and Reproductive Health University of OxfordLevel 3Women’s CentreJohn Radcliffe HospitalOxford OX39DUUnited Kingdom Biomedical Research Centre Qatar UniversityDoha PO Box 2713Qatar

Sperm-specific phospholipase C zeta(PLCζ)initiates intracellular calcium(Ca2+)transients which drive a series of concurrent events collectively termed oocyte *** investigations have linked abrogation and absence/reduction of PLCζwith forms of male infertility in humans where oocyte activation ***,very few studies have examined potential relationships between PLCζand advancing male age,both of which are increasingly considered to be major effectors of male *** efforts in humans may be hindered by inherent PLCζvariability within the human population,alongside a lack of sufficient controllable ***,utilizing immunoblotting,immunofluorescence,and quantitative reverse transcription PCR(qRT-PCR)we examined for the first time PLCζprotein levels and localization patterns in sperm,and PLCζmRNA levels within testes,from mice at 8 weeks,12 weeks,24 weeks,and 36 weeks of age,from two separate strains of mice,C57BL/6(B6;inbred)and CD1(outbred).Collectively,advancing male age generally diminished levels and variability of PLCζprotein and mRNA in sperm and testes,respectively,when both strains were ***,advancing male age altered the predominant pattern of PLCζlocalization in mouse sperm,with younger mice exhibiting predominantly post-acrosomal,and older mice exhibiting both post-acrosomal and acrosomal populations of PLCζ.However,the specific pattern of such decline in levels of protein and mRNA was ***,our results demonstrate a negative relationship between advancing male age and PLCζlevels and localization patterns,indicating that aging male mice from different strains may serve as useful models to investigate PLCζin cases of male infertility and subfertility in humans.

关键词： ageing fertilization male infertility oocyte activation phospholipase C zeta sperm

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