搜索结果: 1-15 共查到“知识库 electric fields”相关记录30条 . 查询时间(0.167 秒)
Measuring Electric Fields and Noncovalent Interactions Using the Vibrational Stark Effect
Organic Chemicals Proteins Vibration Models,Molecular Static Electricity
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2016/5/25
Over the past decade, we have developed a spectroscopic approach to measure electric fields inside matter with high spatial (<1 Å) and field (<1 MV/cm) resolution. The approach hinges on exploiti...
Extreme Electric Fields Power Catalysis in the Active Site of Ketosteroid Isomerase
Electric Power Catalysis Active Site Ketosteroid Isomerase
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2016/5/25
Enzymes use protein architecture to impose specific electrostatic fields onto their bound substrates, but the magnitude and catalytic effect of these electric fields have proven difficult to quantify ...
Calculations of the Electric Fields in Liquid Solutions
Calculations Electric Fields Liquid Solutions
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2016/5/25
The electric field created by a condensed-phase environment is a powerful and convenient descriptor for intermolecular interactions. Not only does it provide a unifying language to compare many differ...
Direct Measurements of Electric Fields in Weak OH••π Hydrogen Bonds
Direct Measurements Electric Fields Weak OH• • π Hydrogen Bonds
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2016/5/25
Hydrogen bonds and aromatic interactions are of widespread importance in chemistry, biology, and materials science. Electrostatics play a fundamental role in these interactions, but the magnitude of t...
Phosphate Vibrations Probe Local Electric Fields and Hydration in Biomolecules
Phosphates Water Phospholipids Spectrophotometry, Infrared Electricity Models, Molecular
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2016/5/25
The role of electric fields in important biological processes such as binding and catalysis has been studied almost exclusively by computational methods. Experimental measurements of the local electri...
Site-Specific Conversion of Cysteine Thiols into Thiocyanate Creates an IR Probe for Electric Fields in Proteins
food packaging perfluorinated dietary intake human exposure
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2016/5/24
The nitrile stretching mode of the thiocyanate moiety is a nearly ideal probe for measuring the local electric field arising from the organized environment of the interior of a protein. Nitriles were ...
Electric Fields at the Active Site of an Enzyme:Direct Comparison of Experiment with Theory
Humans Nitriles Enzyme Inhibitors Spectrophotometry, Infrared Spectrum Analysis Circular Dichroism Electricity Protein Conformation Protein Structure,Tertiary Protein Folding
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2016/5/24
The electric fields produced in folded proteins influence nearly every aspect of protein function. We present a vibrational spectroscopy technique that measures changes in electric field at a specific...
Vibrational Stark Effects Calibrate the Sensitivity of Vibrational Probes for Electric Fields in Proteins
transitional cell carcinoma cDNA microarray molecular markers expression profiling tumor classification
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2016/5/24
Infrared spectroscopy is widely used to probe local environments and dynamics in proteins. The introduction of a unique vibration at a specific site of a protein or more complex assembly offers many a...
Origins of the Sensitivity of Molecular Vibrations to Electric Fields:Carbonyl and Nitrosyl Stretches in Model Compounds and Proteins
phosphoenolpyruvate carboxylase thermostable limited proteolysis flexible loop main chain connectivity
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2016/5/24
The vibrational Stark effect (VSE) is the effect of an electric field on the vibrational spectrum. Typically, the largest change induced by an electric field is the linear frequency shift whose sensit...
Effects of Applied Electric Fields on the Quantum Yields for the Initial Electron Transfer Steps in Bacterial Photosynthesis:II.Dynamic Stark Effect
Applied Electric Fields Quantum Yields Initial Electron Transfer Steps Bacterial Photosynthesis Dynamic Stark Effect
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2016/5/23
The quantum yield of the initial charge separation steps in bacterial photosynthetic reaction centers has been shown to be reduced in an applied electric field [Part I, Lao et al., J. Phys. Chem. 97 (...
Effects of Applied Electric Fields on the Quantum Yields of the Initial Electron-Transfer Steps in Bacterial Photosynthesis.1.Quantum Yield Failure
Applied Electric Fields Quantum Yields Initial Electron-Transfer Steps Bacterial Photosynthesis.1.Quantum
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2016/5/23
The effect of an applied electric field has been measured for the quantum yield of formation of the P[sup +]H[sup [minus]], P[sup +]Q[sub A][sup [minus]], and [sup 3]P states of nonoriented Rb. sphaer...
THE LOW-FREQUENCY ELECTRIC FIELDS INDUCED IN A SPHERICAL CELL INCLUDING ITS NUCLEUS
LOW-FREQUENCY ELECTRIC FIELDS INDUCED SPHERICAL CELL NUCLEUS
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2015/10/16
After a review of work leading to the determination of the electric field induced in the human body when exposed to the electromagnetic field near an extremely-low-frequency high-voltage transmission ...
Total angular momentum representation for atom-molecule collisions in electric fields
Total angular momentum representation atom-molecule collisions electric fields
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2012/2/28
It is shown that the atom-molecule collision problem in the presence of an external electric field can be solved using the total angular momentum representation in the body-fixed coordinated frame, le...
Full orbit simulations of collisional impurity transport in spherical tokamak plasmas with strongly-sheared electric fields
sheared electric fields strongly-sheared electric fields tokamak plasmas
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2011/8/31
The collisional dynamics of test impurity ions in spherical tokamak plasmas with strongly-sheared radial electric fields is investigated by means of a test
particle full orbit simulation code. The st...
高电压脉冲电场下的牛骨胶原蛋白酶法提取（Enzymic Method Extraction of Collagen from Bovine Bone by High Intensity Pulsed Electric Fields）
牛骨 胶原蛋白 高电压脉冲电场
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2010/12/29
将高电压脉冲电场（PEF）技术用于牛骨胶原蛋白的提取，通过单因素试验和Box-Behnken中心设计法得出提取牛骨胶原蛋白的最佳工艺参数为：底物质量浓度1.0g/(100mL)、胃蛋白酶添加量3%、pH值2.5、场强21.98kV/cm、脉冲数7，在此条件下，可溶性蛋白质量浓度高达16.21mg/mL，通过紫外光谱鉴定了所提取的样品为纯胶原蛋白而不含其他杂蛋白。