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排序方式: 共有330条查询结果,搜索用时 15 毫秒
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T Pihlajaniemi J McKeon S Gay R Gay W J de Wet J C Myers D J Prockop 《The Biochemical journal》1989,257(2):439-445
Fibroblasts from two lethal variants of osteogenesis imperfecta were shown to synthesize increased amounts of type IV procollagen. Previous studies established that one of these variants had a non-functional allele for the pro alpha 2 chain of type I procollagen, whereas the other pro alpha 2(I) allele contained a mutation leading to synthesis of shortened pro alpha 2(I) chains. In the two variants, the relative level of mRNA for pro alpha 1(IV) was 31 and 42% of the level of mRNA for pro alpha 1(I) chains. A value of less than 2% was found for a third lethal and four non-lethal variants of osteogenesis imperfecta. Immunofluorescent staining of fibroblasts from the two variants synthesizing increased amounts of type IV procollagen indicated that a homogeneous population of cells synthesized both type IV and type I procollagen. The results suggest that mutations in the type I procollagen genes that result in osteogenesis imperfecta can be associated with increased expression of the genes for type IV procollagen. 相似文献
3.
F Bchir A Chabbou W Basly L Guilloux A Kamel M S Jeguirim N Jawa S Dakhlia G Ville F Jenayah 《Archives de l'Institut Pasteur de Tunis》1989,66(1-2):25-31
Phadiatop is a new in vitro screening test for respiratory allergy. This test, based on the RAST procedure, detects in serum, the presence of specific IgE to a mixture of common inhalent allergens. Among 70 patients (26 children and 44 adults) consulting for respiratory syndrome, Phadiatop was positive in 31 cases. There were a good correlation between this new test and skin tests (59% for adults and 92% for children), total IgE (70% for adults and 65% for children) and RAST (93% for adults and 96% for children). Phadiatop, with a specificity of 100%, a sensitivity of 82% (76% for adults and 92% for children) and an efficiency of 90% (86% for adults and 96% for children), is a more accurate test than total IgE and could be an excellent in vitro screening test for respiratory allergy. 相似文献
4.
K Tasanen T Parkkonen L T Chow K I Kivirikko T Pihlajaniemi 《The Journal of biological chemistry》1988,263(31):16218-16224
A single polypeptide acts as the beta subunit of prolyl 4-hydroxylase and the enzyme protein disulfide isomerase and may also function as a cellular thyroid hormone binding protein. We report here that the human gene for this polypeptide is about 18 kilobase pairs and consists of 11 exons. The two thioredoxin-like regions are coded by exons 1-2 and 8-9, respectively. The codons for the two presumed active sites of protein disulfide isomerase, each a Cys-Gly-His-Cys sequence, are located 12 base pairs from the beginning of exons 2 and 9. The last 3 amino acids coded by exons 1 and 8 and the first 9 amino acids coded by exons 2 and 9, including a broken codon for Tyr, are identical in the respective exon-intron junctions. These regions are also highly homologous to the active sites of bacterial thioredoxins. The data suggest that evolution of this gene has involved exon shuffling and duplication of a two-exon unit, in which the internal exon-intron junctions have been entirely conserved. The region between exons 1-2 and 8-9 appears to contain other duplications. The 5' flanking sequences contain a TATA box, six CCAAT boxes, and other elements which may be involved in regulation of the cellular amounts of this polypeptide. 相似文献
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Mei Li Zhong Wei Jianing Wang Alexandre Jousset Ville‐Petri Friman Yangchun Xu Qirong Shen Thomas Pommier 《Ecology letters》2019,22(1):149-158
While several studies have established a positive correlation between community diversity and invasion resistance, it is less clear how species interactions within resident communities shape this process. Here, we experimentally tested how antagonistic and facilitative pairwise interactions within resident model microbial communities predict invasion by the plant–pathogenic bacterium Ralstonia solanacearum. We found that facilitative resident community interactions promoted and antagonistic interactions suppressed invasions both in the lab and in the tomato plant rhizosphere. Crucially, pairwise interactions reliably explained observed invasion outcomes also in multispecies communities, and mechanistically, this was linked to direct inhibition of the invader by antagonistic communities (antibiosis), and to a lesser degree by resource competition between members of the resident community and the invader. Together, our findings suggest that the type and strength of pairwise interactions can reliably predict the outcome of invasions in more complex multispecies communities. 相似文献
7.
Clinical,genetic and neuropathological findings in a series of 138 fetuses with a corpus callosum malformation 下载免费PDF全文
Caroline Alby Valérie Malan Lucile Boutaud Maria Angela Marangoni Bettina Bessières Maryse Bonniere Amale Ichkou Nadia Elkhartoufi Nadia Bahi‐Buisson Pascale Sonigo Anne‐Elodie Millischer Sophie Thomas Yves Ville Michel Vekemans Férechté Encha‐Razavi Tania Attié‐Bitach 《Birth defects research. Part A, Clinical and molecular teratology》2016,106(1):36-46
8.
Blasi A Mercure E Lloyd-Fox S Thomson A Brammer M Sauter D Deeley Q Barker GJ Renvall V Deoni S Gasston D Williams SC Johnson MH Simmons A Murphy DG 《Current biology : CB》2011,21(14):1220-1224
Human voices play a fundamental role in social communication, and areas of the adult "social brain" show specialization for processing voices and their emotional content (superior temporal sulcus, inferior prefrontal cortex, premotor cortical regions, amygdala, and insula). However, it is unclear when this specialization develops. Functional magnetic resonance (fMRI) studies suggest that the infant temporal cortex does not differentiate speech from music or backward speech, but a prior study with functional near-infrared spectroscopy revealed preferential activation for human voices in 7-month-olds, in a more posterior location of the temporal cortex than in adults. However, the brain networks involved in processing nonspeech human vocalizations in early development are still unknown. To address this issue, in the present fMRI study, 3- to 7-month-olds were presented with adult nonspeech vocalizations (emotionally neutral, emotionally positive, and emotionally negative) and nonvocal environmental sounds. Infants displayed significant differential activation in the anterior portion of the temporal cortex, similarly to adults. Moreover, sad vocalizations modulated the activity of brain regions involved in processing affective stimuli such as the orbitofrontal cortex and insula. These results suggest remarkably early functional specialization for processing human voice and negative emotions. 相似文献
9.
V Fayol D J Hartmann I Sabbagh G Ville 《Comptes rendus des séances de la Société de biologie et de ses filiales》1986,180(3):337-346
We describe a sensitive liquid phase radioimmunoassay for serum IgD. Extreme values obtained from 85 control patients sera are 0.2 and 121 mg/l with an arithmetic mean of 25 mg/l. In atopic patients (with high serum IgE levels), arithmetic mean is 47 mg/l. 相似文献
10.
Susanne Siebentritt Enrico Avancini Marcus Br Jakob Bombsch Emilie Bourgeois Stephan Buecheler Romain Carron Celia Castro Sebastien Duguay Roberto Flix Evelyn Handick Dimitrios Hariskos Ville Havu Philip Jackson Hannu‐Pekka Komsa Thomas Kunze Maria Malitckaya Roberto Menozzi Milos Nesladek Nicoleta Nicoara Martti Puska Mohit Raghuwanshi Philippe Pareige Sascha Sadewasser Giovanna Sozzi Ayodhya Nath Tiwari Shigenori Ueda Arantxa Vilalta‐Clemente Thomas Paul Weiss Florian Werner Regan G. Wilks Wolfram Witte Max Hilaire Wolter 《Liver Transplantation》2020,10(8)