Articles de revues : « Membrane protection »

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Hirase, Tetsuaki, et Koichi Node. « Pleiotropic Effects of Statin in Cardiovascular Protection ». MEMBRANE 34, n^o 5 (2009) : 249–53. http://dx.doi.org/10.5360/membrane.34.249.

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Smoltczyk, U., et K. Malcharek. « Slope protection by membrane structures ». Geotextiles and Geomembranes 2, n^o 4 (janvier 1985) : 323–36. http://dx.doi.org/10.1016/0266-1144(85)90017-2.

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Lai, Haoqiang, Cuiying Zhou et Zhen Liu. « Ecological membrane for slope engineering based on red bed soil ». PLOS ONE 18, n^o 6 (8 juin 2023) : e0286949. http://dx.doi.org/10.1371/journal.pone.0286949.

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Ecological slope protection projects (such as the reinforcement of low slopes by plants and ecological restorations of the soil of high steep rocky slopes) are essential for restoring the natural environment. In this study, red bed soil and composite polymer adhesive materials were used to develop an ecological membrane for application in slope ecological protection. The basic physical and mechanical properties of the ecological membranes with different material percentages were studied through tensile strength test and viscosity test, the effect of different material percentages on the properties of ecological membranes was studied, and the soil protection performance and ecological restoration performance were studied through anti-erosion and plant growth tests. The results show that the ecological membrane is soft and tough, with high tensile strength. The addition of the red bed soil can enhance the strength of the ecological membrane, and the ecological membrane with 30% red bed soil has the highest tensile strength. The ecological membrane has considerable tensile deformation capability and viscosity, and up to 100% by mass, the more composite polymer adhesive materials added, the greater the tensile deformation capability and viscosity. And the ecological membrane can enhance the anti-erosion performance of the soil. This study clarifies the development and technology of the ecological membrane, reveals the effect of different material percentages on the properties of ecological membrane, and analyzes the slope ecological protection mechanism of the ecological membrane, thereby providing theoretical and data support for its development, improvement, and application.

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Yu, Jiafeng, Chenchen Qi, Jixin Zhang, Chun Bao et Hengyong Xu. « Synthesis of a zeolite membrane as a protective layer on a metallic Pd composite membrane for hydrogen purification ». Journal of Materials Chemistry A 3, n^o 9 (2015) : 5000–5006. http://dx.doi.org/10.1039/c4ta06463a.

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A zeolite membrane was synthesized on the surface of Pd membrane by seed-free hydrothermal synthesis. The zeolite membrane, which was used as an “armor”, offered good protection to the Pd membranes, significantly suppressing hydrogen permeance loss.

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Li, Jie, Yushan Li, Yiyi Lu, Wentian Shi et Huafeng Tian. « PDMS/PVDF Electrospinning Membranes for Water-in-Oil Emulsion Separation and UV Protection ». Biomimetics 7, n^o 4 (29 novembre 2022) : 217. http://dx.doi.org/10.3390/biomimetics7040217.

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With industry development, the separation of oily wastewater is becoming more critical. Inspired by organisms such as lotus leaves, biomimetic superhydrophobic surfaces with micro-nano structures have shown great potential in this regard. In this work, PDMS/PVDF oil–water separation membranes with designed microstructures were prepared by electrospinning technology. The membrane-forming effect of electrospinning with different ratios of PDMS and PVDF was studied. The study found that membranes with high PDMS content were more likely to form microspheres, and PDMS tended to concentrate on the microspheres. The results also showed that the microspheres would bring better hydrophobicity to the membrane. When the ratio of PDMS to PVDF is 1:2, the membrane has a water contact angle of up to 150° and an oil contact angle of 0°. At this ratio, the separation efficiency of the membrane for the water-in-oil emulsion is 98.7%, and it can still maintain more than 98% after ten separation cycles, which is a good candidate for oil–water separation. Furthermore, microspheres enable the membrane to achieve macroscopic uniformity and microscopic phase separation so that the membranes have both good elongation and fracture strength. In addition, the PDMS/PVDF membranes also exhibit excellent UV resistance, and their UV protection factor is greater than 185, making them a potential UV protective material.

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Zhou, Gang, Rulin Liu, Qingfeng Xu, Kaili Wang, Yongmei Wang et Seeram Ramakrishna. « Dual-Structure PVDF/SDS Nanofibrous Membranes for Highly Efficient Personal Protection in Mines ». Membranes 12, n^o 5 (29 avril 2022) : 482. http://dx.doi.org/10.3390/membranes12050482.

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Pneumoconiosis in miners is considered a global problem. Improving the performance of individual protective materials can effectively reduce the incidence of pneumoconiosis. In this study, the blend membrane of sodium dodecyl sulfate and polyvinylidene fluoride with a dual structure was prepared using electrospinning techniques, and the morphological structure, fiber diameter, and filtration performance of the nanofiber membranes were optimized by adjusting the PVDF concentration and SDS content. The results show that the incorporation of SDS enabled the nanofiber membranes to show tree-like and beaded fibers. Compared with the original PVDF membrane, the small content of tree-like fibers and beaded fibers can improve the filtration efficiency and reduce the resistance of the fiber membrane. The prepared nanofiber membrane has excellent comprehensive filtration performance, and the quality factor is 0.042 pa−1 when the concentration of PVDF is 10 wt% and the addition of SDS is 0.1 wt%. Furthermore, after high-temperature treatment, the membrane could still maintain good filtration performance. The PVDF/SDS blend nanofiber membrane has outstanding filtration efficiency and good thermal stability and can fully meet the personal protection of miners in underground high-temperature operation environments.

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Tanaka, Keiko, et Koichiro Miyajima. « The Freeze-Drying of Liposome with Saccharides and their Protection Mechanism. » membrane 18, n^o 3 (1993) : 156–63. http://dx.doi.org/10.5360/membrane.18.156.

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Ye, Hai-Bo, Hai-Bo Shi et Shan-Kai Yin. « Mechanisms Underlying Taurine Protection Against Glutamate-Induced Neurotoxicity ». Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 40, n^o 5 (septembre 2013) : 628–34. http://dx.doi.org/10.1017/s0317167100014840.

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Abstract:Taurine appears to exert potent protections against glutamate (Glu)-induced injury to neurons, but the underlying molecular mechanisms are not fully understood. The possibly protected targets consist of the plasma membrane and the mitochondrial as well as endoplasmic reticulum (ER) membranes. Protection may be provided through a variety of effects, including the prevention of membrane depolarization, neuronal excitotoxicity and mitochondrial energy failure, increases in intracellular free calcium ([Ca2+]i), activation of calpain, and reduction of Bcl-2 levels. These activities are likely to be linked spatially and temporally in the neuroprotective functions of taurine. In addition, events that occur downstream of Glu stimulation, including altered enzymatic activities, apoptotic pathways, and necrosis triggered by the increased [Ca2+]i, can be inhibited by taurine. This review discusses the possible molecular mechanisms of taurine against Glu-induced neuronal injury, providing a better understanding of the protective processes, which might be helpful in the development of novel interventional strategies.

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Naparlo, Katarzyna, Grzegorz Bartosz, Ireneusz Stefaniuk, Bogumil Cieniek, Miroslaw Soszynski et Izabela Sadowska-Bartosz. « Interaction of Catechins with Human Erythrocytes ». Molecules 25, n^o 6 (24 mars 2020) : 1456. http://dx.doi.org/10.3390/molecules25061456.

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The aim of this study was to characterize the interaction of chosen catechins ((+)-catechin, (−)-epigallocatechin (EGC), and (−)-epigallocatechin gallate (EGCG)) with human erythrocytes and their protective effects against oxidative damage of erythrocytes. Uptake of the catechins by erythrocytes was studied by fluorimetry, their interaction with erythrocyte membrane was probed by changes in erythrocyte osmotic fragility and in membrane fluidity evaluated with spin labels, while protection against oxidative damage was assessed by protection against hemolysis induced by permanganate and protection of erythrocyte membranes against lipid peroxidation and protein thiol group oxidation. Catechin uptake was similar for all the compounds studied. Accumulation of catechins in the erythrocyte membrane was demonstrated by the catechin-induced increase in osmotic resistance and rigidification of the erythrocyte membrane detected by spin labels 5-doxyl stearic acid and 16-doxyl stearic acid. (−)-Epigallocatechin and EGCG inhibited erythrocyte acetylcholinesterase (mixed-type inhibition). Catechins protected erythrocytes against permanganate-induced hemolysis, oxidation of erythrocyte protein thiol groups, as well as membrane lipid peroxidation. These results contribute to the knowledge of the beneficial effects of catechins present in plant-derived food and beverages.

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Nixon, Alexander, Ying Jia, Carl White et Neil A. Bradbury. « Determination of the membrane topology of lemur tyrosine kinase 2 (LMTK2) by fluorescence protease protection ». American Journal of Physiology-Cell Physiology 304, n^o 2 (15 janvier 2013) : C164—C169. http://dx.doi.org/10.1152/ajpcell.00288.2012.

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Lemur tyrosine kinase 2 (LMTK2) is a novel membrane-anchored kinase reported to be involved in several normal and pathophysiological conditions, including endosomal membrane recycling, prostate cancer, and neurodegeneration. In this study, we have investigated the topology and orientation of LMTK2 within cellular membranes utilizing fluorescence protease protection. Appending the green fluorescent protein to either the amino or carboxyl terminus of LMTK2, we were able to determine which side of intracellular membrane these regions were located. Our results indicate that LMTK2 is an integral membrane protein in which both the amino and carboxyl termini are exposed to the cytoplasm. Moreover, this topology places the kinase active site within the cytoplasm.

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Kratochvil, Huong T., Robert W. Newberry, Bruk Mensa, Marco Mravic et William F. DeGrado. « Spiers Memorial Lecture : Analysis and de novo design of membrane-interactive peptides ». Faraday Discussions 232 (2021) : 9–48. http://dx.doi.org/10.1039/d1fd00061f.

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Zhang, Xinxing, Kevin M. Barraza et J. L. Beauchamp. « Cholesterol provides nonsacrificial protection of membrane lipids from chemical damage at air–water interface ». Proceedings of the National Academy of Sciences 115, n^o 13 (5 mars 2018) : 3255–60. http://dx.doi.org/10.1073/pnas.1722323115.

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The role of cholesterol in bilayer and monolayer lipid membranes has been of great interest. On the biophysical front, cholesterol significantly increases the order of the lipid packing, lowers the membrane permeability, and maintains membrane fluidity by forming liquid-ordered–phase lipid rafts. However, direct observation of any influence on membrane chemistry related to these cholesterol-induced physical properties has been absent. Here we report that the addition of 30 mol % cholesterol to 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) or 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1′-rac-glycerol) (POPG) monolayers at the air–water interface greatly reduces the oxidation and ester linkage cleavage chemistries initiated by potent chemicals such as OH radicals and HCl vapor, respectively. These results shed light on the indispensable chemoprotective function of cholesterol in lipid membranes. Another significant finding is that OH oxidation of unsaturated lipids generates Criegee intermediate, which is an important radical involved in many atmospheric processes.

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Zeng, Guangyong, Hu Zheng, Kun Zhou, Hao Shi, Size Zheng, Hui Ma, Peng Wang et Shengyan Pu. « Preparation, Characterization and Application of Novel Photocatalytic Two-Dimensional Material Membrane : A Reform of Comprehensive Experimental Teaching ». Sustainability 15, n^o 14 (21 juillet 2023) : 11342. http://dx.doi.org/10.3390/su151411342.

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Recently, two-dimensional materials (2DM) have garnered considerable interest in the field of membrane separation owing to their distinctive microstructure and chemical properties. However, membrane fouling still limits the further application of 2DM in wastewater treatment. This work designed and constructed a series of novel composite membranes by introducing the photocatalyst NH2-MIL-88B (Fe) into the structure of 2D material MXene (Ti3C2TX) nanosheets. The membranes not only improved their ability to remove various dyes from wastewater but also achieved in-situ degradation of pollutants on the membrane surface and inner structure, demonstrating its self-cleaning ability. This work solved the critical technical problem of MXene-based membrane fouling, providing a good reference for its further practical application. In addition, it also developed a comprehensive experiment that involves principles of materials science, chemical separation, and environmental protection. By reforming the original experimental design, it is helpful for college students to master interdisciplinary basic knowledge, cultivating their innovation and practical ability. Hence, this work involves approaches is meaningful for both environmental protection and experimental teaching.

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Körber, Martin J., et Stefan Siegmund. « Elastic model for a wind-protection membrane ». Journal of Wind Engineering and Industrial Aerodynamics 165 (juin 2017) : 131–36. http://dx.doi.org/10.1016/j.jweia.2017.03.003.

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GUÉRIN, DANIEL, JEAN-CHRISTOPHE VUILLEMARD et MURIEL SUBIRADE. « Protection of Bifidobacteria Encapsulated in Polysaccharide-Protein Gel Beads against Gastric Juice and Bile ». Journal of Food Protection 66, n^o 11 (1 novembre 2003) : 2076–84. http://dx.doi.org/10.4315/0362-028x-66.11.2076.

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Bifidobacterium cells were encapsulated in a mixed gel composed of alginate, pectin, and whey proteins. Two kinds of capsules were obtained: gel beads without membranes and gel beads with two membranes formed by the transacylation reaction. In vitro studies were carried out to determine the effects of simulated gastric pH and bile salts on the survival of free and encapsulated Bifidobacterium bifidum. The protective effects of gel beads without membranes and gel beads coated with two membranes formed by the transacylation reaction were evaluated. After 1 h in an acidic solution (pH 2.5), the free-cell counts decreased by 4.75 log units, compared with a <1-log decrease for entrapped cells. The free cells did not survive after 2 h of incubation at pH 2.5, while immobilized-cell counts decreased by about 2 log units. After incubation (1 or 3 h) in 2 and 4% bile salt solutions, the bifidobacterium mortality level for membrane-free gel beads (4 to 7 log units) was higher than that for free cells (2 to 3 log units). However, counts of bifidobacteria immobilized in membrane-coated gel beads decreased by <2 log units. Cell encapsulation in membrane-coated protein-polysaccharide gel beads could be used to increase the survival of healthy probiotic bacteria during their transit through the gastrointestinal tract.

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Li, Yu, et Jordan S. Orange. « Degranulation enhances presynaptic membrane packing, which protects NK cells from perforin-mediated autolysis ». PLOS Biology 19, n^o 8 (3 août 2021) : e3001328. http://dx.doi.org/10.1371/journal.pbio.3001328.

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Natural killer (NK) cells kill a target cell by secreting perforin into the lytic immunological synapse, a specialized interface formed between the NK cell and its target. Perforin creates pores in target cell membranes allowing delivery of proapoptotic enzymes. Despite the fact that secreted perforin is in close range to both the NK and target cell membranes, the NK cell typically survives while the target cell does not. How NK cells preferentially avoid death during the secretion of perforin via the degranulation of their perforin-containing organelles (lytic granules) is perplexing. Here, we demonstrate that NK cells are protected from perforin-mediated autolysis by densely packed and highly ordered presynaptic lipid membranes, which increase packing upon synapse formation. When treated with 7-ketocholesterol, lipid packing is reduced in NK cells making them susceptible to perforin-mediated lysis after degranulation. Using high-resolution imaging and lipidomics, we identified lytic granules themselves as having endogenously densely packed lipid membranes. During degranulation, lytic granule–cell membrane fusion thereby further augments presynaptic membrane packing, enhancing membrane protection at the specific sites where NK cells would face maximum concentrations of secreted perforin. Additionally, we found that an aggressive breast cancer cell line is perforin resistant and evades NK cell–mediated killing owing to a densely packed postsynaptic membrane. By disrupting membrane packing, these cells were switched to an NK-susceptible state, which could suggest strategies for improving cytotoxic cell-based cancer therapies. Thus, lipid membranes serve an unexpected role in NK cell functionality protecting them from autolysis, while degranulation allows for the inherent lytic granule membrane properties to create local ordered lipid “shields” against self-destruction.

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Anwar, Pajri, et Jiyanto Jiyanto. « Efektivitas Sukrosa sebagai Proteksi Aktif Membran Ekstraseluler Spermatozoa Sapi Bali pada Zona Pre-Freezing ». Jurnal Agripet 19, n^o 1 (1 avril 2019) : 77–84. http://dx.doi.org/10.17969/agripet.v19i1.14468.

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ABSTRAK. Penelitian ini bertujuan untuk mengetahui efektivitas kinerja sukrosa dalam Tris kuning telur sebagai krioprotektan untuk perlindungan aktif ekstraseluler membran plasma utuh spermatozoa sapi Bali. Bahan yang digunakan dalam penelitian ini adalah sperma sapi Bali terpilih dan bahan pengencer semen. Penelitian menggunakan rancangan acak lengkap (RAL) yang terdiri dari 5 perlakuan dan 4 ulangan. Perlakuan A (Kontrol) = Tris 80%+20% Kuning telur + Gliserol; Perlakuan B = 0,2% Sukrosa + Tris 80%+20% Kuning telur + Gliserol; Perlakuan C = 0,3% Sukrosa + Tris 80%+20% Kuning telur + Gliserol; Perlakuan D = 0,4% Sukrosa + Tris 80%+20% Kuning telur + Gliserol; Perlakuan E = 0,5% Sukrosa + Tris 80%+20% Kuning telur + Griserol. Parameter yang diamati dalam penelitian ini adalah pergerakan progresif aktif spermatozoa dan membran Plasma Utuh (MPU) pada tahap pre-feezing semen sapi Bali. Hasil penelitian menunjukkan bahwa tingkat konsentrasi sukrosa pada tahap pre-freezing tidak berpengaruh nyata (P 0,05%) terhadap persentase progresif aktif spermatozoa dan proteksi MPU semen Sapi Bali dan tingkat aktif progresif spermatozoa dengan penambahan sukrosa dalam kuning telur dikategorikan baik (66.75- 69.00%). Penambahan berbagai level konsentrasi sukrosa sebagai krioprotektan ekstraseluler melapisi dan mengikat membran spermatozoa dari efek perubahan suhu yang drastis pada tahap pre-freezing dalam proses semen beku. The effectiveness of sucrose as the Active Protection of Bali Spermatozoa Extracellular Membranes Pre-Freezing ABSTRACT. This study aimed to determine the effectiveness of the performance of sucrose in tris egg yolk as a cryoprotectant for extracellular active protection of extracellular membrane of Bali bulls spermatozoa. The material used in this study is the sperm of selected Bali bulls and spermatozoa thinning agent. This study used an experimental method with a completely randomized design (CRD) consisting of 5 treatments and 4 replications. Treatment A (Control) = Tris 80% + 20% Egg Yolk + Glycerol; Treatment B = 0.2% Sucrose + Tris 80% + 20% Egg yolk + Glycerol; Treatment C = 0.3% Sucrose + Tris 80% + 20% Egg yolk + Glycerol; Treatment D = 0.4% Sucrose + Tris 80% + 20% Egg yolk + Glycerol; and Treatment E = 0.5% Sucrose + Tris 80% + 20% Egg Yolk + Griserol. The parameters observed in this study were the active progressive movement and extracellular membrane of spermatozoa protection in Bali bulls pre-freezing stage. The results showed that the sucrose tris egg yolk concentration level at the pre freezing stage no significant effect (P 0.05%) on the active progressive percentage of spermatozoa and bali bulls extracellular membrane protection conditions active levels of progressive spermatozoa with the addition of sucrose in egg yolk are categorized as good (66.75- 69.00%). Addition of various levels of sucrose concentration as extracellular cryoprotectant coating and binding of spermatozoa membranes from the effects of drastic temperature changes in the pre-freezing stage in the process of frozen sperm.

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Ikeda, Yoshito. « Exploration of Enhancer of ABCB4–mediated Phospholipid Efflux for the Protection of Hepatocytes Against Bile Salts ». MEMBRANE 45, n^o 4 (2020) : 182–86. http://dx.doi.org/10.5360/membrane.45.182.

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Mertins, Omar, Patrick D. Mathews, Andreza B. Gomide, Mauricio S. Baptista et Rosangela Itri. « Effective protection of biological membranes against photo-oxidative damage : Polymeric antioxidant forming a protecting shield over the membrane ». Biochimica et Biophysica Acta (BBA) - Biomembranes 1848, n^o 10 (octobre 2015) : 2180–87. http://dx.doi.org/10.1016/j.bbamem.2015.06.005.

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Kerkulah, Emmanuel N., Guixuan Jin, Jinlei Huang, Xinyi Huang, Yuling Liu, Chang’e Ran et Hao Peng. « A Mini Review on Treatment of Wastewater with Membrane Technology ». Journal of Basic & ; Applied Sciences 19 (6 juin 2023) : 86–96. http://dx.doi.org/10.29169/1927-5129.2023.19.08.

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Wastewater treatment is a continuous environmental problem, which troubles human activities. Numerous efforts have been made over the years to develop newly efficient technologies, including traditional filtration, coagulation-flocculation, and biological treatment systems. Among which, membrane technology is proven to be a significant one. Membranes technology is divided into four categories based on pore size. The four types of membrane technology including micro-filtration, ultra-filtration, nano-filtration, and reverse osmosis. This paper focus on the introduction, advantages, disadvantages and protection of these four membrane processes.

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HINCHA, Dirk K., et Martin HAGEMANN. « Stabilization of model membranes during drying by compatible solutes involved in the stress tolerance of plants and microorganisms ». Biochemical Journal 383, n^o 2 (8 octobre 2004) : 277–83. http://dx.doi.org/10.1042/bj20040746.

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Many organisms accumulate compatible solutes under environmental stress conditions. Cyanobacteria accumulate compatible solutes in response to increased external salinity, with tolerance increasing from Suc (sucrose) or trehalose to 2-O-(α-D-glucopyranosyl)-glycerol and glycinebetaine accumulating species. It is not clear how these different solutes influence salt tolerance. One possible explanation may be a differential ability of these solutes to stabilize membranes under stress conditions. We therefore performed drying experiments with liposomes in the presence of compatible solutes. Suc, trehalose and sorbitol protected liposomes from leakage of a soluble marker and from membrane fusion during drying and rehydration. 2-O-(α-D-glucopyranosyl)-glycerol was less effective and glycinebetaine showed hardly any effect. In combination with Suc, the latter two solutes showed improved protection. Lipid-phase transitions are known to contribute to solute leakage from liposomes. We determined phase transitions in dry membranes in the absence or presence of the solutes, using Fourier-transform infrared spectroscopy. The ability of the solutes to decrease the phase transition temperature corresponded closely to their ability to protect the liposomes against solute leakage. All solutes interacted with the phosphate in the lipid headgroups. The magnitude of the shift in the asymmetric P=O stretching vibration correlated closely with the lipid-phase transition temperature. This indicates that the degree of membrane protection afforded by the solutes is mainly determined by their ability to interact with the membrane lipids. However, this is not a determinant of cellular protection against salt stress, as the solutes show a reverse order when ranked with regard to protection against these stresses.

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Li, Ya, Xue-Weis Li, Ji-Huan He et Ping Wang. « Thermal protection of electronic devices with the Nylon6/66-PEG nanofiber membranes ». Thermal Science 18, n^o 5 (2014) : 1441–46. http://dx.doi.org/10.2298/tsci1405441l.

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Phase change materials for thermal energy storage have been widely applied to clothing insulation, electronic products of heat energy storage. The thermal storage potential of the nanofiber membranes was analyzed using the differential scanning calorimetry. Effect of microstructure of the membrane on energy storage was analyzed, and its applications to electronic devices were elucidated.

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Kopustinskiene, Dalia M., et Jurga Bernatoniene. « Molecular Mechanisms of Melatonin-Mediated Cell Protection and Signaling in Health and Disease ». Pharmaceutics 13, n^o 2 (20 janvier 2021) : 129. http://dx.doi.org/10.3390/pharmaceutics13020129.

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Melatonin, an endogenously synthesized indolamine, is a powerful antioxidant exerting beneficial action in many pathological conditions. Melatonin protects from oxidative stress in ischemic/reperfusion injury, neurodegenerative diseases, and aging, decreases inflammation, modulates the immune system, inhibits proliferation, counteracts the Warburg effect, and promotes apoptosis in various cancer models. Melatonin stimulates antioxidant enzymes in the cells, protects mitochondrial membrane phospholipids, especially cardiolipin, from oxidation thus preserving integrity of the membranes, affects mitochondrial membrane potential, stimulates activity of respiratory chain enzymes, and decreases the opening of mitochondrial permeability transition pore and cytochrome c release. This review will focus on the molecular mechanisms of melatonin effects in the cells during normal and pathological conditions and possible melatonin clinical applications.

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HIRANO, Hiroyuki, Eriko OSAWA, Yumiko YAMAOKA et Toshio YOKOI. « Gastric-Mucous Membrane Protection Activity of Coptisine Derivatives. » Biological & ; Pharmaceutical Bulletin 24, n^o 11 (2001) : 1277–81. http://dx.doi.org/10.1248/bpb.24.1277.

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Creutz, Carl E., Jaspreet K. Hira, Virginia E. Gee et James M. Eaton. « Protection of the Membrane Permeability Barrier by Annexins ». Biochemistry 51, n^o 50 (5 décembre 2012) : 9966–83. http://dx.doi.org/10.1021/bi3013559.

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Creutz, Carl E. « Protection of the Membrane Permeability Barrier by Annexins ». Biophysical Journal 102, n^o 3 (janvier 2012) : 492a. http://dx.doi.org/10.1016/j.bpj.2011.11.2694.

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Hao, Xin Min, Yuan Yang, Xin Xing Feng et Fei Wang. « Influence of Super Hydrophobic Modification on Protective Performance of PTFE Micropore Membrane ». Advanced Materials Research 627 (décembre 2012) : 726–29. http://dx.doi.org/10.4028/www.scientific.net/amr.627.726.

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Using self - prepared fluorochemical surfactant, PTFE micropore membrane was modified to improve its hydrophobicity. The surface morphology of the membrane was observed by SEM and its Contact angle was determined by. The protective property of the membranes against mustard gas was evaluated using the break-through test. The result shows that, the thesis put forward a novel BC protection idea that through membrane surface modification the poisonous agent can be rolled into liquid spheres and slided away from the membrane surface automatically because of the low surface tension of the membrane, which stands out from the traditional methodology by quick poisonous agent surface expansion and evaporation on the surface of the BC protective material.

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Papaioannou, Emmanouil H., Fabio Bazzarelli, Rosalinda Mazzei, Vasileios Giannakopoulos, Michael R. Roberts et Lidietta Giorno. « Membrane Cascade Fractionation of Tomato Leaf Extracts—Towards Bio-Based Crop Protection ». Membranes 13, n^o 11 (25 octobre 2023) : 855. http://dx.doi.org/10.3390/membranes13110855.

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Promising initial results from the use of membrane-fractionated extracts of tomato leaf as crop protection agents have recently been reported. This paper provides additional evidence from larger scale experiments that identify an efficient pipeline for the separation of tomato leaf extracts to generate a fraction with significant defence elicitor activity. A UF tubular membrane 150 kDa, with an internal diameter of 5 mm, proved appropriate for initial extract clarification, whereas afterwards a UF 10 kDa and three NF membranes (200–800 Da) in sequence were evaluated for the subsequent fractionation of this tomato extract. The compositions of sugars, proteins and total biophenols were changed in these fractions with respect to the initial extract. The initial extract ratio of sugars: proteins: biophenols was 1:0.047:0.052, whereas for the retentate of the 800 Da NF membrane, which has the higher crop protection activity, this ratio was 1:0.06:0.1. In this regard, it appears that the main crop protection effect in this fraction was due to the sugars isolated. It was found that with the appropriate membrane cascade selection (UF 150 kDa, UF 10 kDa and NF 800 Da) it was possible to produce (easily and without the need of additional chemicals) a fraction that has significant activity as an elicitor of disease resistance in tomato, whereas the remaining fractions could be used for other purposes in a biorefinery. This is very promising for the wider application of the proposed approach for the relatively easy formulation of bio-based aqueous streams with bio-pesticide activities.

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Şimşek, Burcu, et Filiz Aslan. « Improvement of the Comfort Features of Denim Products ». European Journal of Research and Development 2, n^o 4 (31 décembre 2022) : 319–25. http://dx.doi.org/10.56038/ejrnd.v2i4.202.

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Today, while people's expectations from textile materials are increasing, the comfort features expected in casual clothes are also increasing. Some important parameters in terms of comfort are protection against wind and rain conditions; protection from the cold; passage of body vapor through layers of clothing; providing the necessary freedom of movement of the garment, etc. The aim of the project is the thermal comfort feature that includes a chemical and membrane layer in a multi-layered structure; is to produce breathable (water vapor permeable) and water-repellent denim fabric and to determine the optimum production method. In this context, optimization studies were conducted by applying membrane and chemicals to the denim fabric. Water vapor resistance, air permeability, capillary wetting, thermal resistance, thermal conductivity, thermal absorbance, and bond strength tests were applied to the product created within the scope of this project. In the experiments, better results were obtained in the air permeability and water vapor resistance parameters of the 10 g/m², polyurethane membrane laminated water-repellent silicone coated sample compared to the other membranes. It was observed that the percent of vertical capillary wetting in the rigid fabric was higher than the membrane laminated, and water repellant applied samples. When different membranes were evaluated, there was no enormous difference between thermal resistance, thermal conductivity, and thermal absorbance values, but the best values of separation bond strength were observed in the sample with 10 g/m² polyurethane membrane and silicon water-repellent outer coating.

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Ademoglu, Evin, Cahide Gökkusu et Sükrü Palandüz. « Vitamin E and ATPases : Protection of ATPase Activities by Vitamin E Supplementation in Various Tissues of Hypercholesterolemic Rats ». International Journal for Vitamin and Nutrition Research 70, n^o 1 (1 janvier 2000) : 3–7. http://dx.doi.org/10.1024/0300-9831.70.1.3.

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It has been shown that the lipid composition of plasma membrane can be modified in vivo by dietary fat. It has also been observed that an increase in the cholesterol content of plasma membranes results in decreased activities of ATPases. In the present study, we evaluated the changes in the activities of ATPases from erythrocytes, hepatocytes, and kidney cortex caused by cholesterol-rich diet in rats and subsequently examined the role of vitamin E administration on the cholesterol-induced effects in these tissues. Administration of hypercholesterolemic diet to the rats for 4.5 months, significantly decreased membrane Na+-K+-ATPase and Ca+2-ATPase activities in comparison to the controls in all tissues studied. Vitamin E supplementation to the hypercholesterolemic rats led to a recovery in membrane ATPase activities. In conclusion, vitamin E supplementation to the rats provided protection against hypercholesterolemic diet-induced impairment of membrane-bound ATPases.

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Kleszczyńska, Halina, Małgorzata Oświęcimska, Dorota Bonarska et Janusz Sarapuk. « Antioxidative Properties Of Pyrrolidinium And Piperidinium Salts ». Zeitschrift für Naturforschung C 57, n^o 3-4 (1 avril 2002) : 344–47. http://dx.doi.org/10.1515/znc-2002-3-424.

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Two series of pyrrolidinium (PYA-n) and piperidinium (PPPA-n) bromides with incorporated antioxidant function were synthesized. Both have hydrocarbon chains with odd number of the carbon atoms (n) ranging between 7 and 15. Pig erythrocytes (RBC) were used to study antioxidant activity of these compounds. They were incorporated into RBC membranes in sublytic (micromolar) concentrations and RBC were then subjected to UV radiation. It was found that all the salts used protected erythrocyte membranes against oxidation of membrane lipids. This protection increased with hydrocarbon chain length. Such effect may be the result of an incorporation of particular compounds to different depths into the lipid phase of RBC membrane depending on their chain length. Such possibility was checked by studies on fluidity changes induced by the compounds studied in ghost membranes by fluorimetric measurements. The measurements showed that pyrrolidinium bromides were slightly more effective in a protection of erythrocytes than the corresponding piperidinium ones. The possible reason of such behaviour may be the difference in lipophilicity between piperidine and pyrrolidine rings

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Lyajfer, A. I., et M. N. Solun. « Lipid peroxidation system-antioxidant protection and the role of its disorders in the pathogenesis of diabetes mellitus and angiopathies ». Problems of Endocrinology 39, n^o 1 (15 février 1993) : 57–60. http://dx.doi.org/10.14341/probl11913.

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The urgency of the problem of diabetic angiopathies is highlighted by the fact that among patients with insulin-dependent diabetes mellitus under the age of 20 years mortality rate is 7 times higher than the average mortality among the General population, and after reaching 20 years, the average annual risk of mortality is 20 times higher than the total population. Recently, in the study of many pathological conditions, considerable attention has been paid to structurally functional changes in cell membranes. The severity and duration of membrane-damaging processes in the body determine the clinical severity and features of the course of many diseases. Membrane destruction as a pathological phenomenon is primarily due to the involvement of cell membrane lipids in lipid peroxidation processes, which leads to a change in lipid-protein bonds, the strength of the complex of enzymes and other membrane macromolecules, damage to nucleic acids, and impaired cellular metabolism.

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Wang, Luchen, Yan Wang, Lianying Wu et Gang Wei. « Fabrication, Properties, Performances, and Separation Application of Polymeric Pervaporation Membranes : A Review ». Polymers 12, n^o 7 (30 juin 2020) : 1466. http://dx.doi.org/10.3390/polym12071466.

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Membrane separation technologies have attracted great attentions in chemical engineering, food science, analytical science, and environmental science. Compared to traditional membrane separation techniques like reverse osmosis (RO), ultrafiltration (UF), electrodialysis (ED) and others, pervaporation (PV)-based membrane separation shows not only mutual advantages such as small floor area, simplicity, and flexibility, but also unique characteristics including low cost as well as high energy and separation efficiency. Recently, different polymer, ceramic and composite membranes have shown promising separation applications through the PV-based techniques. To show the importance of PV for membrane separation applications, we present recent advances in the fabrication, properties and performances of polymeric membranes for PV separation of various chemicals in petrochemical, desalination, medicine, food, environmental protection, and other industrial fields. To promote the easy understanding of readers, the preparation methods and the PV separation mechanisms of various polymer membranes are introduced and discussed in detail. This work will be helpful for developing novel functional polymer-based membranes and facile techniques to promote the applications of PV techniques in different fields.

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Guagliardo, Nick A., Junlan Yao, Changlong Hu et Paula Q. Barrett. « Minireview : Aldosterone Biosynthesis : Electrically Gated for Our Protection ». Endocrinology 153, n^o 8 (11 juin 2012) : 3579–86. http://dx.doi.org/10.1210/en.2012-1339.

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Aldosterone produced by adrenal zona glomerulosa (ZG) cells plays an important role in maintaining salt/water balance and, hence, blood pressure homeostasis. However, when dysregulated, aldosterone advances renal and cardiovascular disease states. Multiple steps in the steroidogenic pathway require Ca2+, and the sustained production of aldosterone depends on maintained Ca2+ entry into the ZG cell. Nevertheless, the recorded membrane potential of isolated ZG cells is extremely hyperpolarized, allowing the opening of only a small fraction of low-voltage-activated Ca2+ channels of the Cav3.x family, the major Ca2+ conductance on the ZG cell membrane. As a consequence, to activate sufficient Ca2+ channels to sustain the production of aldosterone, aldosterone secretagogs would be required to affect large decreases in membrane voltage, a requirement that is inconsistent with the exquisite sensitivity of aldosterone production in vivo to small changes (0.1 mm) in extracellular K+. In this review, we evaluate the contribution of membrane voltage and voltage-dependent Ca2+ channels to the control of aldosterone production and consider data highlighting the electrical excitability of the ZG cell. This intrinsic capacity of ZG cells to behave as electrical oscillators provides a platform from which to generate a recurring Ca2+ signal that is compatible with the lengthy time course of steroidogenesis and provides an alternative model for the physiological regulation of aldosterone production that permits both amplitude and temporal modulation of the Ca2+ signal.

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Imamura, Takuji, Minoru Asada, Sherri K. Vogt, David A. Rudnick, Mark E. Lowe et Louis J. Muglia. « Protection from Pancreatitis by the Zymogen Granule Membrane Protein Integral Membrane-associated Protein-1 ». Journal of Biological Chemistry 277, n^o 52 (24 octobre 2002) : 50725–33. http://dx.doi.org/10.1074/jbc.m204159200.

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Sheng, Jian Rong, et Tian Jiao Zhang. « Research on Light-Duty and Energy-Saving Characteristic of Membrane Structure and its Development Prospect ». Advanced Materials Research 250-253 (mai 2011) : 925–30. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.925.

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This paper analyses the membrane structure’s building material, structural style and its deformability, through which we pointed out that the membrane structure features light-duty and sustainable characteristic. Besides, this article describes the advantage of membrane structure in the area of environment protection and energy-saving from three points of view: acoustic, optical and thermal properties. In addition, development trends of membrane structure in the future constructions as well as the applications in China’s construction development are discussed, leading to the conclusion that the membrane structure, as a kind of light-duty architecture, has great prospects for environment protection and energy-saving applications.

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Paulsen, Friedrich, Thomas Pufe, Wolf Petersen et Bernhard Tillmann. « Expression of Natural Peptide Antibiotics in Human Articular Cartilage and Synovial Membrane ». Clinical Diagnostic Laboratory Immunology 8, n^o 5 (1 septembre 2001) : 1021–23. http://dx.doi.org/10.1128/cdli.8.5.1021-1023.2001.

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ABSTRACT In view of frequent present use of invasive procedures on limb joints, it is astonishing that articular joint inflammation is a rare event. We questioned whether antimicrobial peptides play a role in protecting human articular cartilage and synovial membrane against inflammatory agents. Our results implicate defensins in the protection of human articular joints against pathogens.

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AL.Bayatti, Khalid K., Samia K. Mahmood et Ali A. Abdul-Abbas. « Protection of Chicken against Bacterial Infection by Immunization with Bacterial Subcellular Fractions ». Al Mustansiriyah Journal of Pharmaceutical Sciences 4, n^o 1 (1 juin 2007) : 80–85. http://dx.doi.org/10.32947/ajps.v4i1.382.

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The current studies were undertaken to assess the ability of various subcellular fraction of E.coli to induce protection against challenge with E.coli in chicken.Immunization with as little as 12.5 μg of cytoplasmic membrane conferred 65% protection. In addition cell wall and somatic antigen conferred 55% and 25%protection respectively. These results indicate the usefulness of cytoplasmic membrane and cell wall in the induction of active immunity against pathogenic E.coli in chicken.

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Lüthje, Sabine, et Teresa Martinez-Cortes. « Membrane-Bound Class III Peroxidases : Unexpected Enzymes with Exciting Functions ». International Journal of Molecular Sciences 19, n^o 10 (21 septembre 2018) : 2876. http://dx.doi.org/10.3390/ijms19102876.

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Class III peroxidases are heme-containing proteins of the secretory pathway with a high redundance and versatile functions. Many soluble peroxidases have been characterized in great detail, whereas only a few studies exist on membrane-bound isoenzymes. Membrane localization of class III peroxidases has been demonstrated for tonoplast, plasma membrane and detergent resistant membrane fractions of different plant species. In silico analysis revealed transmembrane domains for about half of the class III peroxidases that are encoded by the maize (Zea mays) genome. Similar results have been found for other species like thale-cress (Arabidopsis thaliana), barrel medic (Medicago truncatula) and rice (Oryza sativa). Besides this, soluble peroxidases interact with tonoplast and plasma membranes by protein–protein interaction. The topology, spatiotemporal organization, molecular and biological functions of membrane-bound class III peroxidases are discussed. Besides a function in membrane protection and/or membrane repair, additional functions have been supported by experimental data and phylogenetics.

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Poppelka, Peter. « Protection of Membrane Walls of Boilers Against Earthquake Effects ». Scientific Proceedings Faculty of Mechanical Engineering 22, n^o 1 (1 décembre 2014) : 81–86. http://dx.doi.org/10.2478/stu-2014-0014.

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AbstractIn this article we present a brief overview of the results of our design, construction, calculation and assembly work in the construction of two boilers for Chile, with the main intention of protecting their membrane walls against seismic effects

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Ghosh, June, Shantanabha Das, Rajan Guha, Debopam Ghosh, Kshudiram Naskar, Anjan Das et Syamal Roy. « Hyperlipidemia offers protection againstLeishmania donovaniinfection : role of membrane cholesterol ». Journal of Lipid Research 53, n^o 12 (10 octobre 2012) : 2560–72. http://dx.doi.org/10.1194/jlr.m026914.

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SMITH, W. D., S. K. SMITH et J. M. MURRAY. « Protection studies with integral membrane fractions of Haemonchus contortus ». Parasite Immunology 16, n^o 5 (mai 1994) : 231–41. http://dx.doi.org/10.1111/j.1365-3024.1994.tb00345.x.

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LI, Donghai. « Protection of phosphatidylcholine to photosystem ? membrane during heat treatment ». Chinese Science Bulletin 48, n^o 9 (2003) : 897. http://dx.doi.org/10.1360/02wc0426.

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Zhang, Zhenggang, Zhendong Li, Huan Lin, Muqin Wang, Zhifu Luo, Feihong Ren, Zixuan Liu, Chen Zhou, Zhe Peng et Deyu Wang. « Transplantable Carbonaceous Li+ Filtrating Membrane for Lithium Metal Protection ». ACS Applied Materials & ; Interfaces 12, n^o 27 (12 juin 2020) : 30494–502. http://dx.doi.org/10.1021/acsami.0c08433.

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Lindholm, Mark, Marjut Metsäniitty, Elisabeth Granström et Jan Oscarsson. « Outer membrane vesicle-mediated serum protection in Aggregatibacter actinomycetemcomitans ». Journal of Oral Microbiology 12, n^o 1 (1 janvier 2020) : 1747857. http://dx.doi.org/10.1080/20002297.2020.1747857.

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Buenfil-Chi, Tomas J., Hilda Mercado-Uribe, Omar Lozano García et Francisco J. Sierra Valdez. « Lipid membrane antioxidant/PLA2-cleavage protection by natural biocompounds ». Biophysical Journal 122, n^o 3 (février 2023) : 224a. http://dx.doi.org/10.1016/j.bpj.2022.11.1329.

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Tapia-Quirós, Paulina, María Fernanda Montenegro-Landívar, Mònica Reig, Xanel Vecino, Javier Saurina, Mercè Granados et José Luis Cortina. « Integration of Nanofiltration and Reverse Osmosis Technologies in Polyphenols Recovery Schemes from Winery and Olive Mill Wastes by Aqueous-Based Processing ». Membranes 12, n^o 3 (18 mars 2022) : 339. http://dx.doi.org/10.3390/membranes12030339.

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More sustainable waste management in the winery and olive oil industries has become a major challenge. Therefore, waste valorization to obtain value-added products (e.g., polyphenols) is an efficient alternative that contributes to circular approaches and sustainable environmental protection. In this work, an integration scheme was purposed based on sustainable extraction and membrane separation processes, such as nanofiltration (NF) and reverse osmosis (RO), for the recovery of polyphenols from winery and olive mill wastes. Membrane processes were evaluated in a closed-loop system and with a flat-sheet membrane configuration (NF270, NF90, and Duracid as NF membranes, and BW30LE as RO membrane). The separation and concentration efficiency were evaluated in terms of the total polyphenol content (TPC), and by polyphenol families (hydroxybenzoic acids, hydroxycinnamic acids, and flavonoids), using high-performance liquid chromatography. The water trans-membrane flux was dependent on the trans-membrane pressure for the NF and RO processes. NF90 membrane rejected around 91% of TPC for the lees filters extracts while NF270 membrane rejected about 99% of TPC for the olive pomace extracts. Otherwise, RO membranes rejected more than 99.9% of TPC for both types of agri-food wastes. Hence, NF and RO techniques could be used to obtain polyphenol-rich streams, and clean water for reuse purposes.

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Lustig, Shlomo, Christiana Fogg, J. Charles Whitbeck, Roselyn J. Eisenberg, Gary H. Cohen et Bernard Moss. « Combinations of Polyclonal or Monoclonal Antibodies to Proteins of the Outer Membranes of the Two Infectious Forms of Vaccinia Virus Protect Mice against a Lethal Respiratory Challenge ». Journal of Virology 79, n^o 21 (1 novembre 2005) : 13454–62. http://dx.doi.org/10.1128/jvi.79.21.13454-13462.2005.

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ABSTRACT Previous studies demonstrated that antibodies to live vaccinia virus infection are needed for optimal protection against orthopoxvirus infection. The present report is the first to compare the protective abilities of individual and combinations of specific polyclonal and monoclonal antibodies that target proteins of the intracellular (IMV) and extracellular (EV) forms of vaccinia virus. The antibodies were directed to one IMV membrane protein, L1, and to two outer EV membrane proteins, A33 and B5. In vitro studies showed that the antibodies to L1 neutralized IMV and that the antibodies to A33 and B5 prevented the spread of EV in liquid medium. Prophylactic administration of individual antibodies to BALB/c mice partially protected them against disease following intranasal challenge with lethal doses of vaccinia virus. Combinations of antibodies, particularly anti-L1 and -A33 or -L1 and -B5, provided enhanced protection when administered 1 day before or 2 days after challenge. Furthermore, the protection was superior to that achieved with pooled immune gamma globulin from human volunteers inoculated with live vaccinia virus. In addition, single injections of anti-L1 plus anti-A33 antibodies greatly delayed the deaths of severe combined immunodeficiency mice challenged with vaccinia virus. These studies suggest that antibodies to two or three viral membrane proteins optimally derived from the outer membranes of IMV and EV, may be beneficial for prophylaxis or therapy of orthopoxvirus infections.

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Cherniy, Volodymyr І., et Lada O. Sobanska. « METHOD OF ERYTHROCYTE PROTECTION IN URGENT CARDIAC SURGERY ». Emergency Medical Service 8, n^o 2 (2021) : 68–74. http://dx.doi.org/10.36740/iemems202102103.

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Aim: The use of a simple, safe and convenient method of treatment extracorporeal circuit with «adaptation composition » (AdC) for the reduction of negative impact on the state of erythrocytes and tissue hypoxia. Material and methods: The research included 150 patients. They were divided into two groups. The first group included patients who underwent surgery with the treatment of an extracorporeal circuit by AdC, the second group was the control group. Сomplete blood count parameters, plasma free hemoglobin concentration, erythrocyte mechanical and osmotic resistance, erythrocyte membrane permeability and acid hemolysis were studied. Results: Use of AdC prevents adsorption the blood cells on the surface of the extracorporeal circuit and protects the erythrocytes during cardiopulmonary bypass in urgent cardiac surgery. Conclusions: The treatment of oxygenator with AdC reduces the negative influence СРВ on state of RBC. Membranes of erythrocytes were more resistant to traumatic factors in the group with AdC.

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Li, Yu, et Jordan Scott Orange. « Degranulation-enhanced presynaptic membrane packing protects NK cells from perforin-mediated autolysis ». Journal of Immunology 204, n^o 1_Supplement (1 mai 2020) : 74.5. http://dx.doi.org/10.4049/jimmunol.204.supp.74.5.

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Abstract NK cells are resistant to autolysis when they kill a target cell using perforin secretion into the lytic immunological synapse. Perforin makes pores in target cell membranes allowing delivery of pro-apoptotic enzymes. Despite the fact that the perforin-containing organelles (lytic granules) are released in close range to both the NK and target cell, the NK cell membrane is protected. How NK cells avoid autolysis during degranulation is perplexing. We demonstrate that NK cells are protected from perforin by their densely packed presynaptic membranes. When treated with 7-ketocholesterol lipid packing is reduced in NK cells, making them susceptible to perforin mediated autolysis after degranulation. Using advanced imaging, we showed that lytic granules themselves have endogenously densely packed membranes. Importantly, during degranulation lytic granule-cell membrane fusion further reinforces local presynaptic membrane packing. This provides enhanced membrane protection at the specific sites of degranulation where NK cells face maximum local concentrations of secreted perforin. Additionally, we found that an aggressive breast cancer cell line utilizes the same strategy to evade NK cellmediated killing. These cells are perforin-resistant owing to a densely packed postsynaptic membrane. By disrupting membrane packing, we effectively switched them to an NK-susceptible state. Overall, we reveal an unexpected role for lipid membranes in NK cell functionality and that degranulation uses lytic granule membrane packing to create local “shields” against autolysis. Furthermore, lipid membrane modulation could alter the susceptibility of perforin-resistant cancer cells and should be considered in cytotoxic cell therapies.

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