A water-soluble, highly polar, heat-stable, small molecule has been isolated from cell-free extracts of the halotolerant green alga Dunaliella salina. This compound, soluble inhibitory factor (SIF), when added to in vivo light-activated, thylakoid membrane-bound preparations of the D. salina coupling factor 1 (CF1), causes a rapid inactivation of the ATPase activity. SIF must be in its oxidized...

Sperm immobilization factor (SIF) was extracted and purified from Escherichia coli filtrate. Characterization of SIF using Liquid chromatography –mass spectrometry (LC-MS) revealed its sequence similarity to chaperone protein HchA of E. coli O157:H7. Further the effect of SIF on sperm functions such as acrosome reaction was studied and the results showed that SIF (500μg/ml) significantly inhibi...

In case for nuclear power plants long-term service operation over their design life, it is necessary to calculate reactor pressure vessel (RPV) strength and durability acknowledgment (static strength, under cyclic seismic loads, brittle fracture resistance (BFR) include) the as one of most important NPP structure. Usually, according assessment, RPV resource determined, that is, time its subsequ...

in this paper, the solution of a moving volterra-type screw dislocation in an orthotropic layer, bonded between two piezoelectric layers is obtained using complex fourier transform. the dislocation solution is then employed as strain nuclei to derive singular integral equations for a medium weakened by multiple moving cracks. these equations, which are classified as, cauchy singular equations, ...

initial cracks occur in high strength concrete sleepers for various reasons, such as shrinkage and wrong curing and long lifetime of over 50 years of sleepers. these cracks may lead to complete failure of the structure. in order to more accurately design the sleepers, fracture mechanics (not strength of materials) should be incorporated. in order to achieve this purpose, it is important to fore...

Climate change amplifies the intensity and occurrence of dry periods leading to drought stress in vegetation. For monitoring vegetation stresses, sun-induced chlorophyll fluorescence (SIF) observations are a potential game-changer, as SIF emission is mechanistically coupled photosynthetic activity. Yet, benefit for not yet understood. This paper analyses impact on canopy-scale surface reflectan...

In this work, XFEM is employed to obtain the stress intensity factors (SIFs) of a semi elliptical part through thickness axial crack. In XFEM, additional functions are employed to enrich the displacement approximation using partition of unity approach. Level set functions are approximated using higher order shape functions in the crack front elements to ensure the accurate modeling of the crack...

Abstract In this research work, the finite element software, ABAQUS is used to study by simulations influence of form defect on mechanical behavior a shrink-fitted assembly presenting internal radial cracks. Under action contact pressure induced tightening between two cylinders, these cracks resulting from incorrect operations or materials elaboration defect, can be harmful assembly. Various we...

This study presented a type of image processing code which is used for sharpening photoelastic fringe patterns of transparent materials in photoelastic experiences to determine the stress distribution. C-Sharp software was utilized for coding the algorithm of this image processing method. For evaluation of this code, the results of a photoelastic experience of a sample contact problem between a...