surface tension of alveoli and surfactant
Báo cáo khoa học: Physical properties and surface activity of surfactant-like membranes containing the cationic and hydrophobic peptide KL4 potx
... of the structural and functional properties of the native proteins and thus may offer a useful basis for the design of agents for therapeutic intervention [7] Studies of different fragments and ... stability of surfactant lipids required for the reduction of surface tension in the alveolus [3] On the other hand, surfactant protein A (SP-A) and surfactant protein D (SP-D) are oligomeric water-soluble ... The genetic absence of SP-B in both humans and mice results in a lack of alveolar expansion and a lethal lack of pulmonary function [3] In contrast, the genetic absence of surfactant protein C...
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Modeling the effect of liquid viscosity and surface tension on bubble formation
... MODELING THE EFFECT OF LIQUID VISCOSITY AND SURFACE TENSION ON BUBBLE FORMATION ZHANG YALI (B ENG, HUT) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF CHEMICAL AND BIOMOLECULAR ... flow rates the surface tension force was greater than the time rate of change of the momentum of the gas entering the bubble, while at higher rates of gas flow the order of magnitude of the two forces ... Gaddis and Vogelpohl 16 2.3.8 The model of Deshpande et al 18 2.4 Pseudo-spherical models 19 2.4.1 The model of Pinczewski 19 2.4.2 The model of Terasaka and Tsuge 21 2.4.3 The model of Yoo et...
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Báo cáo khoa học: N-Glycosylation is important for the correct intracellular localization of HFE and its ability to decrease cell surface transferrin binding pptx
... end of an a-helical region of the HFE a1 domain (V100 and W103A) as being of particular importance for TfR1 interactions [16,17,20] The effect of HFE binding to TfR1 is to lower the affinity of ... sites of HFE N-glycosylation and examine the importance of glycosylation on parameters of protein localization and function Results Tunicamycin treatment results in a reticular pattern of HFE ... mutant forms of HFE and incubated the cells in the presence and absence of tunicamycin Drug treatment resulted in the accumulation of an unglycosylated lower molecular mass form of the wild-type...
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Nonpoint Pollution of Surface Waters with Phosphorus and Nitrogen pdf
... P and N causes a wide range of problems, including toxic algal blooms, loss of oxygen, fish kills, loss of seagrass beds and other aquatic vegetation, degradation of coral reefs, and loss of ... industry and transportation In the U.S and many other nations, inputs of P and N to agriculture in the form of fertilizers exceed outputs of those nutrients in the form of crops High densities of livestock ... agriculture) Runoff from pasture and range Urban runoff from unsewered areas and sewered areas with a population of less than 100,000 Septic leachate and runoff from failed septic systems Runoff from...
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roman louban - image processing of edge and surface defects
... corresponding parts of the histogram (background and surface) from one another (Fig 2.3) The methods for the determination of this separation value of the surface brightness Isurf and of the background ... compared with a standard object In order to so, standard parameters of a straight line (standard ascent and standard shifting), a circle (standard radius), or an ellipse (standard semi-axis) ... on a surface Often, the surface to be inspected is inhomogeneous and of high contrast Brightness fluctuations on the surface are common Still, all defects need to be detected irrespective of other...
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Báo cáo hóa học: " Decoding subtle forearm flexions using fractal features of surface electromyogram from single and multiple sensors" docx
... number of simultaneously active muscles and the muscle activity is weak such as during finger and wrist flexion and extension To overcome this, often sEMG based commands are treated as binary and ... that the feature set consisting of FD and MFL of single channel sEMG are indicators of relative strength of contraction of Figure Estimated shape of MUAPs at the surface when they originate from ... distance of 10 mm (Figure 2) and a preamplifier with gain of 1000, notch filter of 50 Hz and associated harmonics and with 8th order butterworth band pass filter from 20 to 450 Hz The sampling rate of...
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báo cáo hóa học:" Unsaturated phosphatidylcholines lining on the surface of cartilage and its possible physiological roles" potx
... BA, Monds MK: Deficiency of lubrication surfactant lining the articular surface of replaced hips and knees Br J Rheumatol 1998, 37:143-7 Clements JA: Surface tension of lung extracts Proc Soc ... compare the three pairs, PLPC and DPPC, POPC and DPPC, and PLPC and POPC, separately There were significant differences between POPC and DPPC (p = 0.002), and PLPC and POPC (p = 0.003) There was ... conception and design, the conduction of the experiment, the collection, analysis and interpretation of data, the drafting the manuscript and acquisition of funding RWC contributes to the analysis and...
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Báo cáo hóa học: " Mapping of immunogenic and protein-interacting regions at the surface of the seven-bladed β-propeller domain of the HIV-1 cellular interactor EED" pptx
... 29.2 Figure Crystallogenesis of histidine-tagged isoform of EED Crystallogenesis of histidine-tagged isoform of EED (A), Platelet-like crystals of EED3-H6 protein of 441 residues, obtained in ... the EED3 isoform), using homology modelling by sequence alignment and homology with protein(s) of known structures, and assessment of accessible motifs and epitopes at the surface of the EED ... feature of the β-propeller structure of the EED core was that most of the accessible surfaces should be confined to the outer β-strands d, and to flexible loops connecting β-strands of the same...
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Báo cáo hóa học: " The role of single N-glycans in proteolytic processing and cell surface transport of the Lassa virus glycoprotein GP-C" ppt
... of GP-2, only GP-C of the mutants S392A and S397A are further cleaved into GP-1 and GP-2 similar to fully glycosylated wild-type GP-C (Fig 2B, lanes and 5, lower panel), whereas no cleavage of ... (AMAS) and used for repeated immunization of rabbits as described before [7] The obtained antiserum Rb-α-GP2 was tested by peptide standard ELISA [18] and used for immunoblot analyses Mutation and ... 5, and 8, lower panel) In contrast, the lack of N-glycan attachment of the GP-1 mutants T81A, S91A, S101A and S121A abolished the proteolytical processing by SKI-1/S1P (Fig 2A, lanes 2–4 and...
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Báo cáo hóa học: " Surface properties of glass micropipettes and their effect on biological studies" pot
... and average surface roughness (Sa) of all pipettes have been measured Figures 3, 4, 5, and show correlations between pulling parameters and Dt and Sa As it can be seen from Figures 3, 4, 5, and ... significantly decreases Dt and Sa The effects of pull and heat are very similar and not as significant as the effect of velocity Delay and pressure are factors to change the taper length of the pipettes ... heat, both of the Sa and Dt decreases Tip diameter ( m) Tip diameter ( m) Surface roughness (nm) Sa Dt Surface roughness (nm) Sa Delay Figure The effect of delay on tip diameter and average surface...
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báo cáo hóa học:" Electrical characterization and nanoscale surface morphology of optimized Ti/Al/Ta/Au ohmic contacts for AlGaN/GaN HEMT" pdf
... TiAl3 of −2.96 kJ/mol, NiAl3 of −5.32 kJ/mol, MoAl12 of −3.9 kJ/mol, and TaAl3 of −2.40 kJ/mol The effective heat of formation was shown to be successful in correctly predicting the first and most ... barrier, and the lowest ρc value of 7.27 × 10−7 ·cm2 is obtained in sample at an annealing temperature of 850°C and an annealing time of 30 s It is noted that after annealing, samples and with ... inter-diffusion when compared with samples and A very limited in-diffusion of Au and outdiffusion of Ti and Al occurred through the Ta barrier All of these factors resulted in a low contact resistance...
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Báo cáo hóa học: " The Role of Intrinsic and Surface States on the Emission Properties of Colloidal CdSe and CdSe/ZnS Quantum Dots Giovanni Morello Æ Marco Anni Æ Pantaleo Davide Cozzoli " potx
... that the PL of CdSe core and CdSe/ZnS core/shell QDs in the first ns arises from the intrinsic bright ± 1U and ± 1L states with lifetime of about 60 ps and 450 ps, respectively, and from surface states ... times from intrinsic bright states of the fine structure of spherical CdSe QDs [4] into the surface defect states [5], and t3 is comparable with typical lifetime of surface- related emission in CdSe ... our experiments In light of these results we can associate the transitions |1i and |2i to carrier recombination from ± 1U and ± 1L states and the transition |3i to a surface states emission By...
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Báo cáo hóa học: " Influence of GaAs Substrate Orientation on InAs Quantum Dots: Surface Morphology, Critical Thickness, and Optical Properties" docx
... AFM and (b) histogram of the QD height of sample A; (c) AFM and (d) histogram of the QD height of sample B; (e) AFM and (f) histogram of the QD height of sample C; (g) AFM of sample D; (h) AFM of ... lateral size of (57.2 ± 10.8) nm and an average height of (6.1 ± 2.5) nm The formation of two families of QDs was attributed to two growth mode transition onsets at 1.45 and 1.59 ML of InAs coverage ... AFM of sample E surface The bigger QDs had a density of 5.2 109 cm-2, a lateral size of (80.0 ± 8.6) nm and an average height of (14.7 ± 1.0) nm The smaller QDs had a density of 4.0 108 cm-2,...
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EXTENT OF CANALIZATION AND SURFACE FITTING OF FIELDS docx
... canalization and delta and other lowland reclamation work, or of the extent of surface fitting of fields which have been effected in China, Korea and Japan through the many centuries, and which are still ... illustrated in Figs 51 and 52 have been built between 1886 and 1901, both on the extensions of Chungming island and the newly formed main land to the north, as is shown by comparison of Stieler's atlas, ... appointed "The Great" Yu "Superintendent of Works" and entrusted him with the work of draining off the waters of disastrous floods and of canalizing the rivers, and he devoted thirteen years to this...
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Báo cáo lâm nghiệp: "Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species" pptx
... al Table I Radius and Growth Strains (×10−6 ) mean value of tension wood and opposite wood zone from the ten studied trees Family Genus species author Radius of TW zone Radius of OW zone GS mean ... radial growth between tension and opposite zone in the last period of growth when tension wood was produced From finely sanded discs we focused on a macroscopic indicator of growth rate (ring) ... Positions and often called lateral wood, were sometimes in the transition between tension and opposite wood, so there were no calculation of mean values for lateral wood In positions 4, and there...
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Báo cáo khoa học: "Growth stresses in tension wood: role of microfibrils and lignification" pptx
... cross-sectional image of gelatinous layer from that of the other layers and the lumen, and converted it into digital images of 512 x 512 pixels, and the cross-sectional area of the gelatinous layers ... The tensile stress of microfibrils governs the longitudinal tensile stresses in normal and tension wood The compressive stress from the deposition of lignin controls the level of the longitudinal ... generation of tensile stress in microfibrils in their axial direction This report examines the contribution of microfibrils to the generation of tensile growth stresses based upon experimental data of...
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Báo cáo khoa học: " The role of marine salt and surfactants in the decline of Tyrrhenian coastal vegetation in Italy" ppt
... AND METHODS Determination of surfactants and chlorides in sea aerosol The determination of surfactants and chlorides (the latter are useful as indicators of the pres- of sea salt) in aerosols ... the results of a number of experiments the aim of which was to measure the toxic- ity of the various components of polluted sea spray, both in isolation and in synergy MATERIALS AND METHODS Determination ... toxicity of the aerosols were performed by spraying the crowns of young trees of P pinea L, Quercus ilex L, Pittosporum tobira L and Acer opalus Mill with solutions containing surfactants and NaCl...
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Báo cáo khoa học: "Evaporation and surface conductance of three temperate forests in the Netherlands" pdf
... since the publication of a series of model simulations of water use of typical (model) forest stands for the Netherlands [8], forests on the high sandy soils in the Netherlands have been seen as ... analyse the differences and similarities in evaporation and surface conductance of three temperate forests in the Netherlands Evaporation rates and surface conductances of the forests will be ... subject of another paper SITE DESCRIPTION AND MEASUREMENTS The sites are a site of Scots pine on a high sandy soil in the centre of the Nether- lands, a larch site on a loamy soil in the North, and...
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Báo cáo lâm nghiệp: "Interactions of ozone and pathogens on the surface structure of Norway spruce needle" potx
... edges of the stomata (P= 0.0346) The apparently newly crystallized small wax tubes covering the eroded area were typical of this type of injury (Fig 1A and B) - Apart from the erosion of wax ... S-compounds are known to alter the structure of epicuticular waxes of conifers (Cape and Fowler, 1981; Huttunen and Laine, 1981; 1983; Cape, 1983; Crossley and Fowler, 1986; Schmitt et al., 1987) ... causes chemical and morphological changes in the epicuticular waxes of the needles (Huttunen and Laine, 1983; Gunthardt-Goerg, 1986) Erosion of the epicuticular wax, both natural and that caused...
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Surface Engineering of Metals - Principles, Equipment and Technologies Part 1 potx
... development of the technology of surface improvement of structural materials 2.2 Surface engineering today 2.2.1 General areas of activity of surface engineering 2.2.2 Significance of surface engineering ... surface engineering 2.3 Directions of development of surface engineering 2.3.1 Perfection and combination of methods of manufacturing of surface layers 2.3.2 Design of surface layers, based on mathematical ... LLC Table of Contents General Fundamentals of Surface Engineering Part I The concept of surface engineering 1.1 The term surface engineering” 1.2 Scope of topics forming the concept of surface...
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