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1.
2.
Porcine D-amino acid oxidase: production of the biologically active enzyme in Escherichia coli 总被引:4,自引:0,他引:4
E Ciccarelli M Massaer J P Guillaume A Herzog R Loriau A Cravador P Jacobs A Bollen 《Biochemical and biophysical research communications》1989,161(2):865-872
DNA molecules coding either for mature porcine D-amino acid oxidase or for truncated forms of the enzyme have been obtained by stepwise addition of synthetic oligonucleotides to a partial cDNA. Under the control of the lambda PL thermoregulatable promoter, these DNAs were respectively expressed in Escherichia coli as 36, 28 and 25 kilodalton polypeptides, specifically recognised by antibodies raised against the natural enzyme. None of the truncated proteins were biologically active whereas the mature recombinant species was able to hydrolyze D-alanine in vitro as efficiently as the natural product. 相似文献
3.
Questions
Rhododendron ponticum subsp. baeticum is an invasive shrub of growing concern in continental Europe, but little is known about its impact on native plant communities. Here we ask: do environmental conditions differ between forest stands invaded by it and uninvaded stands? Do these differences correlate with R. ponticum's cover? Are these differences associated with differences in taxonomic and functional diversity of vascular plant species of the herb layer? Can these vegetation changes be explained by the sorting of certain life-history traits by R. ponticum-induced environmental changes?Location
Several forests invaded by R. ponticum in the French Atlantic domain.Methods
We recorded vegetation composition and a number of environmental variables in 400-m2 plots that were established in 64 paired forest stands (32 invaded vs 32 uninvaded). We compiled traits from existing databases. We computed several metrics of taxonomic and functional diversity. We compared environmental variables and diversity metrics between invaded and uninvaded stands. We used correlation and regression analyses to relate them with R. ponticum's cover. We ran RLQ and fourth-corner analyses to explore the relationships between R. ponticum invasion, environmental variables, species traits, and vegetation composition.Results
Independent of its abundance, R. ponticum invasion was associated with lower light arrival at the forest floor and increased litter thickness. Concomitantly, species richness and diversity and trait diversity were reduced. The major driver of species assemblages was soil pH, which strongly interacted with the invasion gradient. R. ponticum did not sort species according to traits associated with shade tolerance and thick-litter tolerance. However, tree and shrub saplings were more abundant in invaded than uninvaded stands, at the expense of graminoid and fern species.Conclusions
As R. ponticum becomes the dominant shrub, it exerts new selection forces on life-history traits of extant species, mostly via reduced light availability, increased litter thickness, and physical competition, thereby reducing taxonomic and functional diversity of the herb layer, without impeding tree and shrub self-regeneration, at least in the short term. 相似文献4.
Soldati Adrian Muhumuza Geresomu Dezecache Guillaume Fedurek Pawel Taylor Derry Call Josep Zuberbühler Klaus 《International journal of primatology》2023,44(1):116-139
International Journal of Primatology - Observations of early vocal behaviours in non-human primates (hereafter primates) are important for direct comparisons between human and primate vocal... 相似文献
5.
Dr. Sufi Desrini Julien Ducloux Guillaume Hamion Prof. Charles Bodet Dr. Jérome Labanowski Prof. Mustofa Mustofa Prof. Titik Nuryastuti Prof. Christine Imbert Dr. Marion Girardot 《化学与生物多样性》2023,20(8):e202300130
The extracts of five invasive plants were investigated for antifungal and antibiofilm activities against Candida albicans, C. glabrata, C. krusei, and C. parapsilosis. The antifungal activity was evaluated using the microdilution assay and the antibiofilm effect by measurement of the metabolic activity. Ethanol and ethanol-water extracts of Reynoutria japonica leaves inhibited 50 % of planktonic cells at 250 μg mL−1 and 15.6 μg mL−1, respectively. Ethanol and ethanol-water extracts of Baccharis halimifolia inhibited >75 % of the mature biofilm of C. albicans at 500 μg mL−1. The essential oil (EO) of B. halimifolia leaves was the most active (50 % inhibition (IC50) at 4 and 74 μg mL−1against the maturation phase and 24 h old-biofilms of C. albicans, respectively). Oxygenated sesquiterpenes were the primary contents in this EO (62.02 %), with β-caryophyllene oxide as the major component (37 %). Aromadendrene oxide-(2), β-caryophyllene oxide, and (±)-β-pinene displayed significant activities against the maturation phase (IC50=9–310 μ mol l−1) and preformed 24 h-biofilm (IC50=38–630 μ mol l−1) of C. albicans with very low cytotoxicity for the first two compounds. C. albicans remained the most susceptible species to this EO and its components. This study highlighted for the first time the antibiofilm potential of B. halimifolia, its EO and some of its components. 相似文献
6.
Guillaume A Gaffie D Osmont D Chastres V Sarron JC Quandieu P 《Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology》1996,3(2):63-64
Bovine brains were excised and placed into a transparent mold equipped with a pump and perfusion system. This unit was then centrifuged and changes in brain contour were video recorded. Analysis of the resulting images showed that changes occurred in brain structures as a result of crushing. The effects of perfusion on the amount of deformation and other results are discussed. 相似文献
7.
H. B. Lee J. Guillaume R. Chou G. Cuzon H. H. Heng J. Fuchs 《Zeitschrift fur angewandte Ichthyologie》1995,11(3-4):302-308
This paper describes the effort of the Marine Aquaculture Section of the Primary Production Department in Singapore and the Institut Francais de Recherche pour l'Exploitation de la Mer in developing adequate facilities for fish nutritional requirement studies in Singapore, and in introducing appropriate nutritional methodology so that results are reliable and accurate. One of the first achievements was the demonstration of homogeneous fish (tropical seabass, Lates calcarifer Bloch) growth response in a newly established tank system before any nutritional experiments were initiated. The application of statistical procedures that take into consideration the power of a test and number of replications required has allowed for more accurate interpretation of results. This can be seen in the results of the first nutritional requirement experiment on the optimal dietary protein level of the seabass at constant energy. 相似文献
8.
François-Yves Dupradeau Guillaume Le Flem Jean-Michel Wieruszeski Manuel Dauchez Alain Alix Véronique Larreta-Garde Jean-Pierre Monti 《Letters in Peptide Science》1997,4(4-6):489-495
H-NMR studies of the bovine insulin S-sulfonatedB-chain are reported in H2O/D2O (9/1) and inglycerol-d5 (5 M) using two-dimensional NMRspectroscopy. The first results show that the oxidizedinsulin B-chain secondary structure differs from thatof native insulin by a loss of the -helixbetween the two disulfide bridges and that theglycerol favours the structuring of the peptide. 相似文献
9.
Long-term gene delivery into the livers of immunocompetent mice with E1/E4-defective adenoviruses. 总被引:2,自引:1,他引:1 下载免费PDF全文
J F Dedieu E Vigne C Torrent C Jullien I Mahfouz J M Caillaud N Aubailly C Orsini J M Guillaume P Opolon P Delaere M Perricaudet P Yeh 《Journal of virology》1997,71(6):4626-4637
We have compared the in vitro and in vivo behaviors of a set of isogenic E1- and E1/E4-defective adenoviruses expressing the lacZ gene of Escherichia coli from the Rous sarcoma virus long terminal repeat. Infection of tumor-derived established cell lines of human origin with the doubly defective adenoviruses resulted in (i) a lower replication of the viral backbone that correlated with reduced levels of E2A-specific RNA and protein, (ii) a significant shutoff of late gene and protein expression, and (iii) no apparent virus-induced cytotoxicity. Independently of the extent of the deletion, the additional inactivation of E4 from the viral backbone therefore drastically disabled the virus in vitro, with no apparent effect on transgene expression. A lacZ-transgenic model was used to compare the different recombinant adenoviruses in the livers of C57BL/6 mice. The immune response to the virally encoded beta-galactosidase was minimal in this model, as infusion of the E1-defective adenovirus resulted in a time course of transgene expression that mimicked that in immunodeficient (nu/nu) mice, with very little inflammation and necrosis in the liver. Administration of a doubly defective adenovirus to the transgenic animals led to long-term extrachromosomal persistence of viral DNA in the liver, with no detectable methylation of CpG dinucleotides. However, transient transgene expression was observed independently of the extent of the E4 deletion, suggesting that the choice of the promoter may be critical to maintain transgene expression from these attenuated adenovirus vectors. 相似文献
10.
M. Guillaume Wientjes 《Journal of chromatography. B, Analytical technologies in the biomedical and life sciences》1991,563(2)
A high-performance liquid chromatographic analysis for the anti-AIDS drug 2',3'-dideoxyinosine (ddI) in rat plasma and urine, with a limit of detection of 0.2 μg/ml and requiring a sample size of 100 μl is described. Diluted plasma or urine samples were extracted using a C18 solid-phase extraction column. Retention of ddI on more polar solid-phase extraction columns was insufficient for sample clean-up. This method is useful for pharmacokinetic studies of ddI in small rodents. 相似文献