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Effects of elastic medium on buckling of microtubules due to bending and torsion
Taj, Muhammad,Hussain, Muzamal,Afsar, Muhammad A.,Safeer, Muhammad,Ahmad, Manzoor,Naeem, Muhammad N.,Badshah, Noor,Khan, Arshad,Tounsi, Abdelouahed Techno-Press 2020 Advances in concrete construction Vol.9 No.5
Microtubules buckle under bending and torsion and this property has been studied for free microtubules before using orthotropic elastic shell model. But as microtubules are embedded in other elastic filaments and it is experimentally showed that these elastic filaments affect the critical buckling moment and critical buckling torque of the microtubules. To prove that, we developed orthotropic Winkler like model and demonstrated that the critical buckling moment and critical buckling torque of the microtubules are orders of higher magnitude than those found for free microtubules. Our results show that Critical buckling moment is about 6.04 nNnm for which the corresponding curvature is about θ = 1.33 rad /㎛ for embedded MTs, and critical buckling torque is 0.9 nNnm for the angle of 1.33 rad/㎛. Our results well proved the experimental findings.
Abdullah M. Asiri,Mohammad M. Hussain,Muhammad N. Arshad,Mohammed M. Rahman 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
A set of (E)-N′-chlorobenzylidene-benzenesulfonohydrazide (CBBSH) molecules were synthesized using a condensation method from the derivatives of chlorobenzaldehyde and benzenesulfonylhydrazine in a medium yield which crystallized in EtOH. CBBSH derivatives were characterized using highly refined spectroscopic techniques such as 1H NMR, 13C NMR, FT-IR, FESEM, and UV–Vis. Structure of the CBBSH compounds was confirmed using a single crystal X-ray diffraction technique (SCXRDT) and applied for the potential detection of selective heavy metal ion (HMI), manganese ion (Mn2+) by using reliable electrochemical method. A small layer of CBBSH was deposited onto a smooth GCE with coating binder in order to modify a sensitive and selective Mn2+ sensor. Analytical parameters such as sensitivity, LOD, LOQ of the modified sensor (3-CBBSH/GCE) toward Mn2+ were calculated from the calibration curve (CC) as 1270.0 pA μM−1 cm−2, ≈10.0 pM, and 335.0 mM respectively. This prospective 3-CBBSH/GCE sensor used to the selective measurement of Mn2+ in spiked real samples for example industrial effluent and various water samples (red sea, surface, and tap), and found acceptable and rational results.
Lim, Sang-Sun,Baah-Acheamfour, Mark,Choi, Woo-Jung,Arshad, Muhammad A.,Fatemi, Farrah,Banerjee, Samiran,Carlyle, Cameron N.,Bork, Edward W.,Park, Hyun-Jin,Chang, Scott X. Elsevier 2018 Forest ecology and management Vol.417 No.-
<P><B>Abstract</B></P> <P>Our understanding of the effect of agroforestry systems on soil organic carbon (SOC) is largely limited to the upper layer of the mineral soil, while LFH (litter, partially decomposed litter and humus) and deeper soil layers are poorly studied. In this study, the effects of three different agroforestry systems (hedgerow, shelterbelt, and silvopasture) and their component land-cover types (treed area and adjacent herbland) on SOC stock in LFH and mineral soil layers (0–75 cm) were investigated across 36 sites in central Alberta, Canada. The SOC stock of mineral soil (0–75 cm) was not affected by agroforestry systems but by land-cover type. The treed area had greater (<I>p</I> < 0.001) SOC in the 0–75 cm mineral soil (25.5 kg C m<SUP>−2</SUP>) than the herbland (19.4 kg C m<SUP>−2</SUP>), driven by the greater (<I>p</I> < 0.001) SOC level in the top 0–30 cm rather than that in the deeper layers (30–75 cm). Within the treed area, the silvopasture system that was dominated by broad-leaf deciduous trees had 56–70% more SOC in the 0–10 cm soil than in the hedgerow and shelterbelt systems. The SOC stock in the 0–10 cm layer was positively (<I>p</I> = 0.025) related to the C stock of the overlying LFH layer in the silvopasture system. These results together with the 22–24% higher dissolved organic carbon (DOC) concentration in the silvopasture than in the other systems suggest that the greater SOC stock in the 0–10 cm mineral soil could be attributed to the higher rates of translocation of DOC from the LFH in the silvopasture than that in shelterbelt or hedgerow. We conclude that SOC stock in the top mineral soil (e.g., 0–30 cm) is more responsive to changes in land-cover type and the LFH layer plays an important role in increasing SOC stock in the surface mineral soil of the agroforestry systems in central Alberta.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In agroforestry systems, treed area had greater SOC than herbland. </LI> <LI> Silvopasture had greater SOC than hedgerow and shelterbelt. </LI> <LI> LFH layer played a critical role in increasing SOC in mineral layer. </LI> <LI> SOC storage in 0–30 cm mineral layer was most responsive to land-cover type. </LI> </UL> </P>