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排序方式: 共有106条查询结果,搜索用时 15 毫秒
1.
Stephan Francke Karine Clement Christian Dina Hiroshi Inoue Philip Behn Vincent Vatin Arnaud Basdevant Bernard Guy-Grand M. Alan Permutt Philippe Froguel J. Hager 《Human genetics》1997,100(5-6):491-496
Family studies have shown that in some populations up to 75% of the variation of body mass index can be explained by genetic
factors. However, in humans, no major obesity gene has been identified to date. In contrast, there are a number of genetically
well defined animal models for obesity. In two of those models (ob/ob and db/db), defects in the same pathway are responsible
for obesity. Recently, some evidence has been found for the OB gene also being involved in human obesity. In this study we
investigated the potential role of the OB receptor (OBR) in the etiology of massive obesity in humans using familial linkage
analyses and case-control association studies. The typing of two microsatellite markers (D1S198 and D1S209), flanking the
OBR gene, in 256 sib pairs showed no evidence for linkage with obesity. In order to be able to detect small gene effects,
association studies with a 3′-UTR insertion/deletion polymorphism were carried out. The results of these analyses remained
non-significant (χ2 = 3.442, P = 0.18). However, subjects heterozygous for the insertion/deletion polymorphism showed a slight trend towards lower insulin
values 30 min after an oral glucose load compared to homozygous individuals (P = 0.02). In summary, our results do not support a major role of the human OBR gene in the development of morbid obesity in
our population.
Received: 4 December 1996 / Accepted: 25 June 1997 相似文献
2.
V E Eysselein G A Eberlein D Grandt M Schaeffer B Zehres U Behn D Schaefer H Goebell M Davis T D Lee 《Peptides》1990,11(1):111-116
PYY was purified from canine colonic mucosa by sequential steps of reverse phase HPLC and ion-exchange FPLC. Microsequence, amino acid and mass spectral analyses of the purified peptide and its tryptic fragments were consistent with the structure: YPAKPEAPGEDASPEELSRYYASLRHYLNLVTRQRY-amide. Canine PYY(1-36) has the identical sequence as porcine and rat PYY but differs from human PYY at position 3, with Ala instead of Ile, and position 18, with Ser instead of Asn. A smaller form, PYY(3-36), was also purified and characterized. It may differ in its biological activity from the intact peptide and could act as a partial antagonist or agonist of PYY(1-36). 相似文献
3.
John P. Alao Pim J. Huis in 't Veld Frederike Buhse Per Sunnerhagen 《Molecular microbiology》2010,77(1):143-157
The DNA damage and stress response pathways interact to regulate cellular responses to genotoxins and environmental stresses. How these pathways interact in Schizosaccharomyces pombe is not well understood. We demonstrate that osmotic stress suppresses the DNA damage sensitivity of checkpoint mutants, and that this occurs through three distinct cell cycle delays. A delay in G2/M is dependent on Srk1. Progression through mitosis is halted by the Mad2‐dependent spindle checkpoint. Finally, cytokinesis is impaired by modulating Cdc25 expression. These three delays, imposed by osmotic stress, together compensate for the loss of checkpoint signalling. 相似文献
4.
W. Behn und C. G. Arnold 《Molecular & general genetics : MGG》1972,114(3):266-272
Summary Transfer of a non-Mendelian neamine-dependent (nd) mutant to an antibioticfree medium results in neamine-sensitive and neamine-resistent revertants. These reversions are caused by extranuclear mutations.The neamine-sensitive revertants are no more able to split offnd-cells after back-donation to neamine containing medium. Therefore they are different from the streptomycin-sensitive revertants of a streptomycin-dependent (sd) mutant. These mutants were capable ofsd-segregation though their potence ofsd-segregation diminished on antibiotic-free medium with increasing time of cultivation.The different behaviour can be explained by the fact that manysd-genes are present which have to be appointed to the mitochondria. On the other side, thend-gene exists only in few copies and is located therefore in the chloroplast.Several experiments with differing methods are discussed to localize the extranuclear genes.
Vorgelegt durch G. Melchers 相似文献
Vorgelegt durch G. Melchers 相似文献
5.
Ester B. M. Remmerswaal Paul L. Klarenbeek Nuno L. Alves Marieke E. Doorenspleet Barbera D. C. van Schaik Rebecca E. E. Esveldt Mirza M. Idu Ester M. M. van Leeuwen Nelly van der Bom-Baylon Antoine H. C. van Kampen Sven D. Koch Hanspeter Pircher Frederike J. Bemelman Anja ten Brinke Frank Baas Ineke J. M. ten Berge Rene A.W. van Lier Niek de Vries 《Journal of virology》2015,89(1):568-580
6.
7.
Karsten Schnatbaum Victor Solis‐Mezarino Daniil Pokrovsky Frederike Schfer Dennis Nagl Lars Hornberger Johannes Zerweck Tobias Knaute Julia Avramova‐Nehmer Mike Schutkowski Veit Hornung Holger Wenschuh Moritz Carl Vlker‐Albert Axel Imhof Ulf Reimer 《Proteomics》2020,20(10)
Targeted proteomics depends on the availability of stable isotope labeled (SIL) peptide standards, which for absolute protein quantification need to be absolutely quantified. In the present study, three new approaches for absolute quantification of SIL peptides are developed. All approaches rely on a quantification tag (Qtag) with a specific UV absorption. The Qtag is attached to the peptide during synthesis and is removed by tryptic digestion under standard proteomics workflow conditions. While one quantification method (method A) is designed to allow the fast and economic production of absolutely quantified SIL peptides, two other methods (methods B and C) are developed to enable the straightforward re‐quantification of SIL peptides after reconstitution to control and monitor known problems related to peptide solubility, precipitation, and adhesion to vials. All methods yield consistent results when compared to each other and when compared to quantification by amino acid analysis. The precise quantitation methods are used to characterize the in vivo specificity of the H3 specific histone methyltransferase EZH2. 相似文献
8.
Frederike Diana Hanke Guido Dehnhardt 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》2009,195(7):643-650
In this study, we measured aerial visual acuity in harbor seals. As a first approach to the hypothesis that harbor seals can
obtain acute aerial visual acuity mediated by the interaction of the vertical slit-shaped pupil and the corneal flattening
although refractive measurements had revealed aerial myopia, visual acuity was tested as a function of luminance and pupil
dilation. We analyzed aerial visual acuity (minimal resolvable stripe width) in three harbor seals in a two-alternative-forced-choice
discrimination experiment. Our results further support the hypothesis that harbor seals possess an aerial visual acuity comparable
to the acuity in clear waters if the vertical slit pupil does not exceed the zone of corneal flattening in bright light. When
the pupil dilates with decreasing luminance, visual acuity decreases which might be due to deflected light from the stronger
curved peripheral cornea. 相似文献
9.
Frederike Behn Stephan Michels Stephanie Ler Gottfried Blaschke 《Journal of chromatography. B, Analytical technologies in the biomedical and life sciences》2001,755(1-2)
A sensitive capillary electrophoretic method for the determination of carvedilol enantiomers in 100 μl of human plasma has been developed and validated. Carvedilol and the internal standard carazolol are isolated from plasma samples by liquid–liquid extraction using diethylether. A sensitive and selective detection is provided by helium–cadmium laser-induced fluorescence. The total analysis time is 17.5 min, about 30 min are needed for the sample preparation. The linearity of the assay ranges from 1.56 to 50 ng/ml per carvedilol enantiomer. The limits of quantification (LOQ) for the carvedilol enantiomers in 100 μl of human plasma are 1.56 ng/ml. The inter-day accuracy for R-carvedilol is between 95.8 and 103% (104% at LOQ) and for S-carvedilol between 97.1 and 103% (107% at LOQ); the inter-day precision values are between 3.81 and 8.64% (10.9% at LOQ) and between 5.47 and 7.86% (7.91% at LOQ) for R- and S-carvedilol, respectively. The small sample volume needed is especially advantageous for the application in clinical studies in pediatric patients. As an application of the assay concentration/time profiles of the carvedilol enantiomers in a 5-year-old patient receiving a test dose of 0.09 mg/kg carvedilol are reported. 相似文献
10.
Quentin J. M. Huys Daniel Renz Frederike Petzschner Isabel Berwian Christian Stoppel Helene Haker 《PloS one》2016,11(3)