Articoli di riviste: "Native hydrogen"

1

Scott, Erin. "Exploring for native hydrogen". Nature Reviews Earth & Environment 2, n. 9 (27 agosto 2021): 589. http://dx.doi.org/10.1038/s43017-021-00215-2.

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Garrido, Claudia A., Michel Vargas e Jose F. Alvarez-Barreto. "Auto-Cross-Linking Hydrogels of Hydrogen Peroxide-Oxidized Pectin and Gelatin for Applications in Controlled Drug Delivery". International Journal of Polymer Science 2019 (24 febbraio 2019): 1–11. http://dx.doi.org/10.1155/2019/9423565.

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Pectin-based hydrogels for biomedical applications have attracted recent attention due to their low cost, large availability of the materials, and high levels of biocompatibility. Specifically, periodate-oxidized pectin has been combined with chitosan and gelatin to form different structures. However, hydrogen peroxide-mediated oxidation of pectin has not been studied for this application; furthermore, there is little information on the effect of the degree of oxidation on hydrogel characteristics nor has the feasibility of these systems as controlled drug delivery matrices been explored. Thus, the present work proposes to study the properties of gelatin-peroxide-oxidized pectin hydrogels as drug delivery systems in wound dressing applications. Combinations of pectin at different degrees of oxidation (high, low, and native pectin) and gelatin were analyzed and tested by swelling properties, reswelling from xerogel and aerogel forms, SEM, FTIR, and drug release. It was determined that hydrogels that contained oxidized pectin had improved swelling ratios and stability, at 32°C, compared to those with native pectin and only gelatin. The porosity of the oxidized pectin hydrogels allowed to have sustained and high release rates, which would make them an attractive alternative for wound dressings.

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LeMaster, David M., Janet S. Anderson e Griselda Hernández. "Role of Native-State Structure in Rubredoxin Native-State Hydrogen Exchange†". Biochemistry 45, n. 33 (agosto 2006): 9956–63. http://dx.doi.org/10.1021/bi0605540.

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Lee, In-Ho, e Seung-Yeon Kim. "Dynamic Folding Pathway Models of the Trp-Cage Protein". BioMed Research International 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/973867.

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Using action-derived molecular dynamics (ADMD), we study the dynamic folding pathway models of the Trp-cage protein by providing its sequential conformational changes from its initial disordered structure to the final native structure at atomic details. We find that the numbers of native contacts and native hydrogen bonds are highly correlated, implying that the native structure of Trp-cage is achieved through the concurrent formations of native contacts and native hydrogen bonds. In early stage, an unfolded state appears with partially formed native contacts (~40%) and native hydrogen bonds (~30%). Afterward, the folding is initiated by the contact of the side chain of Tyr3 with that of Trp6, together with the formation of the N-terminalα-helix. Then, the C-terminal polyproline structure docks onto the Trp6 and Tyr3 rings, resulting in the formations of the hydrophobic core of Trp-cage and its near-native state. Finally, the slow adjustment processes of the near-native states into the native structure are dominant in later stage. The ADMD results are in agreement with those of the experimental folding studies on Trp-cage and consistent with most of other computational studies.

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Amini, M. N., R. Saniz, D. Lamoen e B. Partoens. "Hydrogen impurities and native defects in CdO". Journal of Applied Physics 110, n. 6 (15 settembre 2011): 063521. http://dx.doi.org/10.1063/1.3641971.

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Bai, Y., T. Sosnick, L. Mayne e S. Englander. "Protein folding intermediates: native-state hydrogen exchange". Science 269, n. 5221 (14 luglio 1995): 192–97. http://dx.doi.org/10.1126/science.7618079.

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7

Liu, Wei, Yong Cui, Xu Du, Zhe Zhang, Zisheng Chao e Yulin Deng. "High efficiency hydrogen evolution from native biomass electrolysis". Energy & Environmental Science 9, n. 2 (2016): 467–72. http://dx.doi.org/10.1039/c5ee03019f.

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Van de Walle, Chris G. "Interactions of hydrogen with native defects in GaN". Physical Review B 56, n. 16 (15 ottobre 1997): R10020—R10023. http://dx.doi.org/10.1103/physrevb.56.r10020.

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9

Stanzione, Antonella, Alessandro Polini, Velia La Pesa, Alessandro Romano, Angelo Quattrini, Giuseppe Gigli, Lorenzo Moroni e Francesca Gervaso. "Development of Injectable Thermosensitive Chitosan-Based Hydrogels for Cell Encapsulation". Applied Sciences 10, n. 18 (19 settembre 2020): 6550. http://dx.doi.org/10.3390/app10186550.

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The three-dimensional complexity of the native extracellular matrix (ECM) suggests switching from 2D to 3D culture systems for providing the cells with an architecture more similar to the physiological environment. Reproducing the three-dimensionality in vitro can guarantee beneficial effects in terms of cell growth, adhesion, proliferation, and/or their differentiation. Hydrogels have the same tailorable physico-chemical and biological characteristics as ECM materials. In this study, we propose a thermoresponsive chitosan-based hydrogel that gels thanks to the addition of organic and inorganic salt solutions (beta-glycerolphosphate and sodium hydrogen carbonate) and is suitable for cell encapsulation allowing obtaining 3D culture systems. Physico-chemical analyses showed that the hydrogel formulations jellify at physiological conditions (37 °C, pH 7.4), are stable in vitro up to three weeks, have high swelling ratios and mechanical stiffness suitable for cellular encapsulation. Moreover, preliminary biological tests underlined the pronounced biocompatibility of the system. Therefore, these chitosan-based hydrogels are proposed as valid biomaterials for cell encapsulation.

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Gaucher, Eric C. "New Perspectives in the Industrial Exploration for Native Hydrogen". Elements 16, n. 1 (1 febbraio 2020): 8–9. http://dx.doi.org/10.2138/gselements.16.1.8.

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Zheng, Yuanxia, Jason Lapano, G. Bruce Rayner e Roman Engel-Herbert. "Native oxide removal from Ge surfaces by hydrogen plasma". Journal of Vacuum Science & Technology A 36, n. 3 (maggio 2018): 031306. http://dx.doi.org/10.1116/1.5020966.

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Hoang, L., S. Bedard, M. M. G. Krishna, Y. Lin e S. W. Englander. "Cytochrome c folding pathway: Kinetic native-state hydrogen exchange". Proceedings of the National Academy of Sciences 99, n. 19 (26 agosto 2002): 12173–78. http://dx.doi.org/10.1073/pnas.152439199.

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Pan, Yinquan, e Martha S. Briggs. "Hydrogen exchange in native and alcohol forms of ubiquitin". Biochemistry 31, n. 46 (novembre 1992): 11405–12. http://dx.doi.org/10.1021/bi00161a019.

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St. Pierre, T. G., W. Chua-anusorn, P. Sipos, I. Kron e J. Webb. "Reaction of hydrogen sulfide with native horse spleen ferritin". Inorganic Chemistry 32, n. 20 (settembre 1993): 4480–82. http://dx.doi.org/10.1021/ic00072a053.

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15

TASALTIN, N., F. DUMLUDAG, M. EBEOGLU, H. YUZER e Z. OZTURK. "Pd/native nitride/n-GaAs structures as hydrogen sensors". Sensors and Actuators B: Chemical 130, n. 1 (14 marzo 2008): 59–64. http://dx.doi.org/10.1016/j.snb.2007.07.114.

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Arrington, Cammon B., e Andrew D. Robertson. "Microsecond Protein Folding Kinetics from Native-State Hydrogen Exchange†". Biochemistry 36, n. 29 (luglio 1997): 8686–91. http://dx.doi.org/10.1021/bi970872m.

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Tanabe, Toyokazu, Tatsuhiro Tanikawa, Katsutoshi Nakamori, Shigenori Ueda, Ben Nanzai, Yasuo Matsubara e Futoshi Matsumoto. "Solar hydrogen evolution over native visible-light-driven Sn3O4". International Journal of Hydrogen Energy 45, n. 53 (ottobre 2020): 28607–15. http://dx.doi.org/10.1016/j.ijhydene.2020.07.160.

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18

Pap, Andrea E., Csaba Dücső, Katalin Kamarás, Gábor Battistig e István Bársony. "Heavy Water in Gate Stack Processing". Materials Science Forum 573-574 (marzo 2008): 119–31. http://dx.doi.org/10.4028/www.scientific.net/msf.573-574.119.

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The high reactivity of the free silicon surface and its consequence: the “omnipresent” native silicon dioxide hinders the interface engineering in many processing steps of IC technology on atomic level. Methods known to eliminate the native oxide need in most cases vacuum processing. They frequently deteriorate the atomic flatness of the silicon. Hydrogen passivation by a proper DHF (diluted HF) treatment removes the native silicon oxide without roughening the surface while simultaneously maintains a “quasi oxide free” surface in a neutral or vacuum ambient for short time. Under such circumstances the last thermal desorption peak of hydrogen is activated at around 480-500°C where the free silicon surface suddenly becomes extremely reactive. In this study we show that deuterium passivation is a promising technology. Due to the fact that deuterium adsorbs more strongly on Si surface than hydrogen even at room temperature, deuterium passivation does not need vacuum processing and it ensures a robust process flow.

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YARN, KAO-FENG. "HIGH SENSITIVE HYDROGEN SENSOR BY Pd/OXIDE/InGaP MOS STRUCTURE". Modern Physics Letters B 20, n. 28 (10 dicembre 2006): 1781–87. http://dx.doi.org/10.1142/s0217984906011888.

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Experimental formation of LPO (liquid phase oxidation)-grown InGaP native oxide near room temperature (~60° C ) is demonstrated. A high oxidation rate is obtained and checked by SEM and AES. The native oxide is determined to be composed of InPO 4 and Ga 2 O 3, analyzed by the results of XPS measurement. Due to the presence of the excellent quality of InGaP native oxide, high hydrogen ( H 2) sensitivity in output current of a Pd /oxide/ InGaP MOS Schottky diode is observed. Under the applied voltage of -1 V and 50 ppm H 2/air, a high sensitivity of 1090 is obtained. An obvious variation of output current and a short response time due to the exposure to different H 2 concentration are also achieved. For example, the adsorption (τa) and desorption (τb) time constants under 50 ppm H 2/air are 2.3 s and 2.7 s, respectively.

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Ivashchenko, Marina N., Anna V. Deryugina, Olga N. Ermokhina, Pavel S. Ignatiev, Mikhail I. Latushko, Vladislav B. Metelin, Andrey A. Belov e Alexey I. Erzutov. "CHANGES IN THE METABOLISM OF NATIVE AND DECONSERVED BULL SPERMATOZOA UNDER THE ACTION OF MOLECULAR HYDROGEN". Siberian Journal of Life Sciences and Agriculture 16, n. 3 (30 giugno 2024): 133–48. http://dx.doi.org/10.12731/2658-6649-2024-16-3-1152.

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Background. The process of storing sperm in a deeply frozen state causes structural and functional disorders of spermatozoa, which reduces their fertilizing ability. The main mechanism of the negative effect of cryopreservation on spermatozoa is the development of oxidative stress. Molecular hydrogen has some advantages as a potential antioxidant molecule - it is a selective effect on certain reactive oxygen species, the ability to overcome cell membranes, the absence of toxic effects. Purpose. To study the effect of molecular hydrogen on the functional status of native and deconserved sperm cells of breeding bulls. Materials and methods. The object of the study was the ejaculates of bulls before cryopreservation and after defrosting. The native sperm diluted with the "BioXcell" diluent, the native sperm diluted with the "BioXcell" diluent enriched with molecular hydrogen, the sperm after deep freezing and the sperm after deep freezing pretreated with molecular hydrogen were studied. The intensity of free radical processes and the activity of antioxidant enzymes were determined in spermatozoa. Results. After cryopreservation of sperm, the processes of lipid peroxidation in spermatozoa are significantly activated. The content of malondialdehyde, diene and triene conjugates increases. The use of molecular hydrogen to correct the quality of sperm production after cryopreservation gave positive results. A decrease in the concentration of primary and intermediate products of lipid peroxidation was noted. The activity of superoxide dismutase and catalase in spermatozoa significantly increases. Conclusion. Molecular hydrogen has the potential as a new and effective antioxidant, the widespread use of which is possible for veterinary purposes. Sponsorship information. The study was funded by the Russian Science Foundation grant No. 23-26-00205.

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Swift, Michael W., e John L. Lyons. "Deep levels in cesium lead bromide from native defects and hydrogen". Journal of Materials Chemistry A 9, n. 12 (2021): 7491–95. http://dx.doi.org/10.1039/d0ta11742k.

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Rifai, Yusnita. "SEARCH FOR GLIOMA DIRECT BINDING SITE OF ALKALOID USING PROTEIN-LIGAND ANT SYSTEM®". Asian Journal of Pharmaceutical and Clinical Research 11, n. 15 (3 ottobre 2018): 65. http://dx.doi.org/10.22159/ajpcr.2018.v11s3.30034.

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Objective: This research aims to know the best affinity and the best chemical conformation of anticancer compounds from alkaloid groups that have closed direction to Glioma-associated oncogene using protein-ligand ant system (PLANTS®). The interaction energy and hydrogen bond are included as evaluated targets.Methods: In this research, 27 ligands with root mean square deviation score at 1.614 Å and cyclopamine as native ligand are used. Meanwhile, staurosporinone acts as gliomas directed-binding-site-internal-control. Each ligand is docked in GLI with Protein Data Bank code 2GLI using two methods, GLI contains water and without water.Results: PLANTS® score for native ligand in the first and the second method is −73.9002 and −73.2700, respectively. Pancracristine, homoharringtonine, and sanguinarine showed PLANTS® score closed to the cyclopamine score result, but their hydrogen bond interaction differed from native ligan interaction. Evodiamine ligand has a good score and hydrogen bond to the same amino acid of protein GLI, which are GLU 175 and THR 173. This result indicated that evodiamine has the same identical mechanism as staurosporinone.Conclusion: The evodiamine is determined to have the same working mechanism as a GLI inhibitor.

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Bhutani, Nidhi, e Jayant B. Udgaonkar. "Folding subdomains of thioredoxin characterized by native-state hydrogen exchange". Protein Science 12, n. 8 (agosto 2003): 1719–31. http://dx.doi.org/10.1110/ps.0239503.

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Mazon, H. "Hydrogen/deuterium exchange studies of native rabbit MM-CK dynamics". Protein Science 13, n. 2 (1 febbraio 2004): 476–86. http://dx.doi.org/10.1110/ps.03380604.

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Petit, E. J., F. Houzay e J. M. Moison. "Interaction of atomic hydrogen with native oxides on GaAs(100)". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 10, n. 4 (luglio 1992): 2172–77. http://dx.doi.org/10.1116/1.578000.

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Largy, Eric, e Valérie Gabelica. "Native Hydrogen/Deuterium Exchange Mass Spectrometry of Structured DNA Oligonucleotides". Analytical Chemistry 92, n. 6 (10 febbraio 2020): 4402–10. http://dx.doi.org/10.1021/acs.analchem.9b05298.

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Petit, E. J., F. Houzay e J. M. Moison. "Interaction of atomic hydrogen with native oxides on InP(100)". Surface Science 269-270 (maggio 1992): 902–8. http://dx.doi.org/10.1016/0039-6028(92)91367-k.

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Vendruscolo, Michele, Emanuele Paci, Christopher M. Dobson e Martin Karplus. "Rare Fluctuations of Native Proteins Sampled by Equilibrium Hydrogen Exchange". Journal of the American Chemical Society 125, n. 51 (dicembre 2003): 15686–87. http://dx.doi.org/10.1021/ja036523z.

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Viktor, Volkov, Chelli R. e Righini R. "2P271 INTERMOLECULAR RELATIONS AND HYDROGEN BOND DYNAMICS AT PHOSPHOLIPID MEMBRANE INTERFACE(Native and artificial biomembranes,Oral Presentations)". Seibutsu Butsuri 47, supplement (2007): S180. http://dx.doi.org/10.2142/biophys.47.s180_4.

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Utschig, Lisa M., Sarah R. Soltau, Karen L. Mulfort, Jens Niklas e Oleg G. Poluektov. "Z-scheme solar water splitting via self-assembly of photosystem I-catalyst hybrids in thylakoid membranes". Chemical Science 9, n. 45 (2018): 8504–12. http://dx.doi.org/10.1039/c8sc02841a.

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Rumpel, Sigrun, Judith F. Siebel, Christophe Farès, Jifu Duan, Edward Reijerse, Thomas Happe, Wolfgang Lubitz e Martin Winkler. "Enhancing hydrogen production of microalgae by redirecting electrons from photosystem I to hydrogenase". Energy Environ. Sci. 7, n. 10 (2014): 3296–301. http://dx.doi.org/10.1039/c4ee01444h.

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Ivanek, Ondřej, Pavel Schmidt e Bohdan Schneider. "Infrared spectroscopic study of the hydration of porous glass". Collection of Czechoslovak Chemical Communications 54, n. 4 (1989): 878–91. http://dx.doi.org/10.1135/cccc19890878.

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Infrared spectra of mesoporous and macroporous siliceous glasses were measured in the native state and after silylation, at various contents of H2O and D2O. By analysis of these spectra it was found that water is bound to the glass surface by strong hydrogen bonds between the water molecules and isolated Si-OH groups; capillary condensation was observed only in native mesoporous glasses.

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Byrd, J. C., D. T. A. Lamport, B. Siddiqui, S. F. Kuan, R. Erickson, S. H. Itzkowitz e Y. S. Kim. "Deglycosylation of mucin from LS174T colon cancer cells by hydrogen fluoride treatment". Biochemical Journal 261, n. 2 (15 luglio 1989): 617–25. http://dx.doi.org/10.1042/bj2610617.

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Mucin from xenografts of LS174T human colon cancer cells was treated with anhydrous HF for 1 h at 0 degree C to give a product (HFA) with over 80% of the glucosamine and hexose removed, but retaining some galactosamine, and for 3 h at room temperature to give a product (HFB) devoid of carbohydrate. Rabbit antibodies against HFA bound to HFA much more than to HFB, and bound to native mucin to an intermediate extent. Antibodies to HFB bound to HFB more than to HFA, and did not bind to native mucin. Both HFA and native mucin bound a number of lectins, but HFB did not. By SDS/polyacrylamide-gel electrophoresis and size-exclusion h.p.l.c., native mucin and HFA are of apparent molecular mass greater than 400 kDa, whereas HFB is heterogeneous and of low molecular mass. On Western blots, antibody to HFA detected both high-molecular-mass mucin and a 90 kDa protein in homogenates of LS174T cells. Antibody to HFB detected a major 70 kDa band as well as higher-molecular-mass species. In tissue sections of normal colon and colon cancers, antibody to HFA showed both cytoplasmic and extracellular staining, whereas antibody to HFB generally stained only cytoplasmic antigens. These results indicate that anti-HFB antibody is specific for apo-mucin, whereas anti-HFA antibody is specific for GalNAc-apo-mucin.

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Adhikari, Jagat, James Heffernan, Melissa Edeling, Estefania Fernandez, Prashant N. Jethva, Michael S. Diamond, Daved H. Fremont e Michael L. Gross. "Epitope Mapping of Japanese Encephalitis Virus Neutralizing Antibodies by Native Mass Spectrometry and Hydrogen/Deuterium Exchange". Biomolecules 14, n. 3 (20 marzo 2024): 374. http://dx.doi.org/10.3390/biom14030374.

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Japanese encephalitis virus (JEV) remains a global public health concern due to its epidemiological distribution and the existence of multiple strains. Neutralizing antibodies against this infection have shown efficacy in in vivo studies. Thus, elucidation of the epitopes of neutralizing antibodies can aid in the design and development of effective vaccines against different strains of JEV. Here, we describe a combination of native mass spectrometry (native-MS) and hydrogen/deuterium exchange mass spectrometry (HDX-MS) to complete screening of eight mouse monoclonal antibodies (MAbs) against JEV E-DIII to identify epitope regions. Native-MS was used as a first pass to identify the antibodies that formed a complex with the target antigen, and it revealed that seven of the eight monoclonal antibodies underwent binding. Native mass spectra of a MAb (JEV-27) known to be non-binding showed broad native-MS peaks and poor signal, suggesting the protein is a mixture or that there are impurities in the sample. We followed native-MS with HDX-MS to locate the binding sites for several of the complex-forming antibodies. This combination of two mass spectrometry-based approaches should be generally applicable and particularly suitable for screening of antigen–antibody and other protein–protein interactions when other traditional approaches give unclear results or are difficult, unavailable, or need to be validated.

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Persson, Filip, e Bertil Halle. "How amide hydrogens exchange in native proteins". Proceedings of the National Academy of Sciences 112, n. 33 (20 luglio 2015): 10383–88. http://dx.doi.org/10.1073/pnas.1506079112.

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Amide hydrogen exchange (HX) is widely used in protein biophysics even though our ignorance about the HX mechanism makes data interpretation imprecise. Notably, the open exchange-competent conformational state has not been identified. Based on analysis of an ultralong molecular dynamics trajectory of the protein BPTI, we propose that the open (O) states for amides that exchange by subglobal fluctuations are locally distorted conformations with two water molecules directly coordinated to the N–H group. The HX protection factors computed from the relative O-state populations agree well with experiment. The O states of different amides show little or no temporal correlation, even if adjacent residues unfold cooperatively. The mean residence time of the O state is ∼100 ps for all examined amides, so the large variation in measured HX rate must be attributed to the opening frequency. A few amides gain solvent access via tunnels or pores penetrated by water chains including native internal water molecules, but most amides access solvent by more local structural distortions. In either case, we argue that an overcoordinated N–H group is necessary for efficient proton transfer by Grotthuss-type structural diffusion.

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KHAIRUDIN, NURUL BAHIYAH AHMAD, e HABIBAH A. WAHAB. "PROTEIN STRUCTURE PREDICTION USING GAS PHASE MOLECULAR DYNAMICS SIMULATION: EOTAXIN-3 CYTOKINE AS A CASE STUDY". International Journal of Modern Physics: Conference Series 09 (gennaio 2012): 193–98. http://dx.doi.org/10.1142/s2010194512005259.

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In the current work, the structure of the enzyme CC chemokine eotaxin-3 (1G2S) was chosen as a case study to investigate the effects of gas phase on the predicted protein conformation using molecular dynamics simulation. Generally, simulating proteins in the gas phase tend to suffer from various drawbacks, among which excessive numbers of protein-protein hydrogen bonds. However, current results showed that the effects of gas phase simulation on 1G2S did not amplify the protein-protein hydrogen bonds. It was also found that some of the hydrogen bonds which were crucial in maintaining the secondary structural elements were disrupted. The predicted models showed high values of RMSD, 11.5 Å and 13.5 Å for both vacuum and explicit solvent simulations, respectively, indicating that the conformers were very much different from the native conformation. Even though the RMSD value for the in vacuo model was slightly lower, it somehow suffered from lower fraction of native contacts, poor hydrogen bonding networks and fewer occurrences of secondary structural elements compared to the solvated model. This finding supports the notion that water plays a dominant role in guiding the protein to fold along the correct path.

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Yarn, Kao Feng, Y. L. Lin, M. C. Chure, K. K. Wu e S. C. Chang. "Pd/Oxide/InGaP MOS Schottky Hydrogen Sensor with Native Thin Oxide". Solid State Phenomena 121-123 (marzo 2007): 627–30. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.627.

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Liquid phase deposition (LPD) grown InGaP native oxide near room temperature (~60oC) is demonstrated and investigated for the first time. A high oxidation rate (~80nm/hr) is obtained and checked by SEM and AES. The oxide is determined to be composed of InPO4 and Ga2O3 which are analyzed by the results of XPS measurement. Due to the presence of excellent quality of InGaP native oxide, high hydrogen (H2) sensitivity in output current of Pd/oxide/InGaP MOS Schottky diode is observed. Under the applied voltage of -1V and 50ppm H2/air, a high sensitivity of 1090 is obtained. In addition, an obvious variation of output current and a short response time due to the exposure to different H2 concentration are also achieved.

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Dou, Zhaolin, Zhe Zhang e Min Wang. "Self-hydrogen transfer hydrogenolysis of native lignin over Pd-PdO/TiO2". Applied Catalysis B: Environmental 301 (febbraio 2022): 120767. http://dx.doi.org/10.1016/j.apcatb.2021.120767.

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Hill, R. Blake, Jae-Kyoung Hong e William F. DeGrado. "Hydrogen Bonded Cluster Can Specify the Native State of a Protein". Journal of the American Chemical Society 122, n. 4 (febbraio 2000): 746–47. http://dx.doi.org/10.1021/ja9919332.

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Kim, Key Sun, James A. Fuchs e Clare K. Woodward. "Hydrogen exchange identifies native-state motional domains important in protein folding". Biochemistry 32, n. 37 (21 settembre 1993): 9600–9608. http://dx.doi.org/10.1021/bi00088a012.

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Bai, Yawen. "Protein Folding Pathways Studied by Pulsed- and Native-State Hydrogen Exchange". Chemical Reviews 106, n. 5 (maggio 2006): 1757–68. http://dx.doi.org/10.1021/cr040432i.

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Wang, Chunxiao, Meiling Liu, Ying Li, Yujie Zhang, Mingyue Yao, Yi Qin e Yanlin Liu. "Hydrogen sulfide synthesis in native Saccharomyces cerevisiae strains during alcoholic fermentations". Food Microbiology 70 (aprile 2018): 206–13. http://dx.doi.org/10.1016/j.fm.2017.10.006.

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Craig, Patricio O., Joachim Lätzer, Patrick Weinkam, Ryan M. B. Hoffman, Diego U. Ferreiro, Elizabeth A. Komives e Peter G. Wolynes. "Prediction of Native-State Hydrogen Exchange from Perfectly Funneled Energy Landscapes". Journal of the American Chemical Society 133, n. 43 (2 novembre 2011): 17463–72. http://dx.doi.org/10.1021/ja207506z.

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Gardino, Alexandra K., Janice Villali, Aleksandr Kivenson, Ming Lei, Ce Feng Liu, Phillip Steindel, Elan Z. Eisenmesser et al. "Transient Non-native Hydrogen Bonds Promote Activation of a Signaling Protein". Cell 139, n. 6 (dicembre 2009): 1109–18. http://dx.doi.org/10.1016/j.cell.2009.11.022.

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45

Ohashi, Takashi, Yoshiki Saito, Takahiro Maruyama e Yasushi Nanishi. "Effect of atomic hydrogen irradiation on native oxides of InN surface". Journal of Crystal Growth 237-239 (aprile 2002): 1022–26. http://dx.doi.org/10.1016/s0022-0248(01)02120-0.

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46

Irún, Marı́a P., Maria M. Garcia-Mira, Jose M. Sanchez-Ruiz e Javier Sancho. "Native hydrogen bonds in a molten globule: the apoflavodoxin thermal intermediate". Journal of Molecular Biology 306, n. 4 (marzo 2001): 877–88. http://dx.doi.org/10.1006/jmbi.2001.4436.

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47

Khajanchi, Namita, Rebeca Mena, Mary Konkle e Sheila Jaswal. "Determining Native-State Dynamics of Mitoneet using Hydrogen Exchange Mass Spectrometry". Biophysical Journal 116, n. 3 (febbraio 2019): 477a. http://dx.doi.org/10.1016/j.bpj.2018.11.2577.

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48

Singh, Sanjay K., Avinash Thirumalai, Asmita Pathak, Donald N. Ngwa e Alok Agrawal. "Functional Transformation of C-reactive Protein by Hydrogen Peroxide". Journal of Biological Chemistry 292, n. 8 (17 gennaio 2017): 3129–36. http://dx.doi.org/10.1074/jbc.m116.773176.

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Abstract (sommario):

C-reactive protein (CRP) is present at sites of inflammation including amyloid plaques, atherosclerotic lesions, and arthritic joints. CRP, in its native pentameric structural conformation, binds to cells and molecules that have exposed phosphocholine (PCh) groups. CRP, in its non-native pentameric structural conformation, binds to a variety of deposited, denatured, and aggregated proteins, in addition to binding to PCh-containing substances. In this study, we investigated the effects of H2O2, a prototypical reactive oxygen species that is also present at sites of inflammation, on the ligand recognition function of CRP. Controlled H2O2 treatment of native CRP did not monomerize CRP and did not affect the PCh binding activity of CRP. In solid phase ELISA-based ligand binding assays, purified pentameric H2O2-treated CRP bound to a number of immobilized proteins including oxidized LDL, IgG, amyloid β peptide 1–42, C4b-binding protein, and factor H, in a CRP concentration- and ligand concentration-dependent manner. Using oxidized LDL as a representative protein ligand for H2O2-treated CRP, we found that the binding occurred in a Ca2+-independent manner and did not involve the PCh-binding site of CRP. We conclude that H2O2 is a biological modifier of the structure and ligand recognition function of CRP. Overall, the data suggest that the ligand recognition function of CRP is dependent on the presence of an inflammatory microenvironment. We hypothesize that one of the functions of CRP at sites of inflammation is to sense the inflammatory microenvironment, change its own structure in response but remain pentameric, and then bind to pathogenic proteins deposited at those sites.

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Tomshin, M. D., A. G. Kopylova e A. E. Vasilyeva. "Native Iron in Siberian Traps". Петрология 31, n. 2 (1 marzo 2023): 202–16. http://dx.doi.org/10.31857/s086959032302005x.

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Abstract (sommario):

The results of study of intrusive traps with a large-scale occurrence of native iron allowed us to identify general patterns of their composition and origin. Intrusive bodies are weakly differentiated; they feature a similar structure and mineralogical, petrochemical and geochemical composition. Two associations of rock-forming minerals were found in all the studied bodies, i.e. early deep (pre-chamber) and intra-chamber. Native iron forms nodular segregation, with a subordinate amount of cohenite, troilite and magnetite-wustite. Natural reduced iron can concentrate many elements, such as Ni, Co, Au and PGE. Their content in metal increases by hundreds or even thousands of times compared to the hosting silicate part. The formation of native iron is based on the fluid-magmatic interaction between magma substance and reducing components of the fluid, primarily of methane-hydrogen composition. As a result, dispersion of a primarily homogeneous basalt liquid into silicate and metallic components occurs. In the process of transfer, finely dispersed phases of iron form droplet-liquid segregations with a monomolecular layer of gas on their surface that prevents enlargement of metallic droplets. In the hypabyssal chamber, magma degassing occurs, including degassing from metallic spherules. The processes of droplet fusion and formation of native phase segregations begin.

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Wang, Fei, Bubesh Jotheeswaran, John Tolle, Xing Lin, Pei Pei Gao e Alex Demos. "Carbon Removal and Native Oxide Cleaning on Si and SiGe Surfaces in Previum Chamber". Solid State Phenomena 282 (agosto 2018): 25–30. http://dx.doi.org/10.4028/www.scientific.net/ssp.282.25.

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Abstract (sommario):

Advanced technology node demands new capabilities in pre-cleaning substrates of epitaxy films. In particular, cleaning carbon and native oxide on Si and SiGe surfaces are required. In this paper, we present an approach to cleaning both carbon and Si/SiGe native oxide using Previum chamber with two distinct chemistries. FTIR and SEM are used to characterize the conversion and sublimation steps of cleaning native oxide, and carbon film etch rate by hydrogen radicals is presented. The carbon cleaning and oxide cleaning capabilities are integrated in Previum chamber and significantly improved cleaning results are supported by SIMS.

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