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Five noncovalent peptidic ligands show different affinity rankings in solution and gas phase
Andrey Dyachenko , Michael Goldflam , Marta Vilaseca , Ernest Giralt

Stability of noncovalent complexes of VEGF protein with 5 peptidic ligands is studied. Experiments were conducted in solution (NMR CSP, ITC) and in gas phase (CID TOF MS). Each ligand differs from others in chirality of one amino acid. It was shown, that trend of stability of the studied noncovalent complexes is reversed in the gas phase relatively to the solution. An explanation of this behavior is presented.

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Mass-Spectrometric Analysis with Sequenom EpiTYPER of GNAS Methylation in Pseudohypoparathyroydism Type Ib Patients Reveals Overall Methylation Defects also for the Familial Cases
Benedetta Izzi1, Bart Claes2, Diether Lambrechts2, Chris Van Geet1,3, Kathleen Freson1

Sequenom EpiTYPER analysis of GNAS methylation in Pseudohypoparathyroidism type Ib patients reveals overall GNAS methylation defects also for the familial cases. Such abnormalities are not detectable via old methodologies such as PCR followed by methylation specific restriction digestion and are here for the first time described.

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Force Spectroscopy of the Iron Atom in Heme Proteins
J. T. Sage, B M. Leu, T. H. Ching, Y. Zhang, J. E. Straub, J. Zhao, W. Sturhahn, E. E. Alp

Nuclear resonance vibrational spectroscopy (NRVS) selectively reveals the complete vibrational density of states (VDOS) of a Mössbauer probe nucleus within a protein. Frequency moments of the VDOS determine effective force constants for 57Fe at the active sites of cytochrome c (cyt c) and deoxymyoglobin (Mb).

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No Impact of Dietary Iodine Restriction in Short Term Development of Hypothyroidism Following Fixed Dose Radioactive Iodine Therapy for Graves Disease
Jubbin J Jacob*, Charles Stephen§, Nihal Thomas*, Regi Oommen¶ and M.S.Seshadri*

To study the outcomes at 6 months after fixed dose 131I therapy for Graves’ disease (GD) with an iodine restricted diet.

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SOME BIOLOGICAL PROPERTIES OF TRITERPENOID ACIDS
S.N. Morozkina, O.I. Antimonova, E.M. Eremenko*, A.G. Shavva

Ursolic and betulinic acids acids induce the processes of apoptosis. We tested the risk of osteoporosis induction under influence of triterpenoids, since they can interact with glucocorticoid receptors. In experiments on oviriectomized rats we found that acids do not show any negative influence on percentage of mineral components in the femur and have cholesterol-lowering action under experimental conditions.

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the packing of preparative liquid chromatography columns
f;dardoize

a new type of preparative liquid chromatography columns is described with applications of the efficiency

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Achieving Great Science : Bringing Together Physical Measurements and Chemical Analysis
Michael Boruta, Michel Hachey

Many problems in analytical spectroscopy require insight from several different techniques to adequately resolve the problem. A common difficulty with using several techniques is often the ability to manage the various data types and making the data available for review, analysis and reporting.

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Rapid Metabolite Identification using Advanced Algorithms for Mass Spectral Interpretation
Mark A. Bayliss, Margaret Antler, Graham McGibbon, Vitaly Lashin

Recognizing differences between related LC/MS data sets is the basic premise for the determination of potential metabolites in drug development. Finding small differences between two or more datasets requires a deep and rigorous analysis of each data set to extract and determine those m/z values that give rise to chromatographic peaks.

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Microwave-Assisted Rapid Access to Bio-active Heterocycles
Vivek Polshettiwar and Rajender S. Varma

Environmentally benign protocols have been developed for the synthesis of various pharmaceutically active heterocycles namely 1,3,4-oxadiazoles, 1,3,4-thiadiazoles, 1,3-dioxanes, pyrazoles, hydrazones and 3,4-dihydropyrimidin-2(1H)-ones, which proceed under the influence of microwave irradiation and using eco-friendly conditions. These greener protocols were catalyzed efficiently by solid supported Nafion®NR50, phosphorus pentasulfide on alumina under solvent-free conditions.

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Showing Results 81 - 90 of 118
Scientific News
Cells Build 'Cupboards' To Store Metals
Lawrence Livermore researchers have discovered that cells of the alga Chlamydomonas Reinhardti build a “pantry” to store metal and maintain equilibrium.
Non-Gluten Proteins as Targets of Immune Response to Wheat in Celiac Disease
The results were reported online in the Journal of Proteome Research.
Turkeys may be Lifesavers
Antibiotic to target staph infections, strep, comes from good bacteria in turkeys.
Did You Hear The One About The Two Businessmen On A Plane?
EquipNet’s vision ‘to revolutionize the way companies manage their surplus assets’ was first conceived at 30,000 feet somewhere between Chicago and Boston in 1999. Here we learn more about the company's first 15 years.
Proteomics for Systems Toxicology
MS-based proteomics is maturing into a robust technology for the measurement of proteome-wide exposure effects.
Charge-Tagged Proline-Based Organocatalyst for Mechanistic Studies Using ESI-MS
In a comparative continous flow ESI-MS study, researchers use a new charged catalyst and neutral L-proline to investigate the proline-catalyzed inverse crossed aldol reaction of aldehydes with diethyl ketomalonate.
Could Non-gluten Proteins Play a Role in Celiac Disease?
Scientists are reporting in ACS’ Journal of Proteome Research that people with the disease also have reactions to non-gluten wheat proteins.
Mass Spec Sample Prep Cut From Days to Minutes
The method, developed by Livermore scientists, accommodates liquid samples and bypasses the graphitization process, enabling sample preparation and analysis in minutes.
LLNL, UC Davis Partner to Personalize Cancer Medications
With a $7.8 million, five-year grant from the NIH researchers are utilizing accelerator mass spectrometry for cancer research.
Novel Solutions to Fight the Obesity Gene
Potent inhibitors a potential new class of anti-obesity drugs that target one of the most common genetic causes of obesity.
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