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Mathieu H. [Lessons from Pierre Royer]. Arch Pediatr 1995; 2:819-22. [PMID: 7581775 DOI: 10.1016/0929-693x(95)90431-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Lefebvre P, Christol P, Mathieu H, Glutsch S. Confined excitons in semiconductors: Correlation between binding energy and spectral absorption shape. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:5756-5759. [PMID: 9981762 DOI: 10.1103/physrevb.52.5756] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mathieu C, Mathieu H. Aluminum in serum determined by HPLC. Clin Chem 1995; 41:625. [PMID: 7720260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Bellabchara A, Lefebvre P, Christol P, Mathieu H. Improved modeling of excitons in type-II semiconductor heterostructures by use of a three-dimensional variational function. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:11840-11844. [PMID: 9975322 DOI: 10.1103/physrevb.50.11840] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lefebvre P, Christol P, Mathieu H. Unified formulation of excitonic absorption spectra of semiconductor quantum wells, superlattices, and quantum wires. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:17308-17315. [PMID: 10008340 DOI: 10.1103/physrevb.48.17308] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Christol P, Lefebvre P, Mathieu H. Low dimensionality semiconductors: modelling of excitons
via a fractional-dimensional space. ACTA ACUST UNITED AC 1993. [DOI: 10.1051/jp3:1993237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Balmain N, Hauchecorne M, Pike JW, Cuisinier-Gleizes P, Mathieu H. Distribution and subcellular immunolocalization of 1,25-dihydroxyvitamin D3 receptors in rat epiphyseal cartilage. Cell Mol Biol (Noisy-le-grand) 1993; 39:339-50. [PMID: 8392883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The distribution and subcellular localization of the 1,25-dihydroxyvitamin D3 receptor (VDR) in the epiphyseal cartilage of normal weaning rats were examined immunocytochemically at the light and electron microscope level using a monoclonal anti-VDR antibody (9A7 gamma). VDR immunoreactivity was detected in the nuclei of chondrocytes in all zones of the epiphyseal plate cartilage from the resting to calcifying chondrocytes, and at much lower concentrations, in the cytoplasms. Perichondrial mesenchymal cells contained no VDR immunoreactivity. VDR immunoreactivity developed in the nuclei of cells in the lateral margin area as they acquired the chondroblast phenotype. VDR immunoreactivity was also found over the nucleoli of chondrocytes in all cells zones of the epiphyseal plate and appeared in the nucleoli of the cells in the lateral margin area before immunostaining of the nuclei, as the mesenchymal cells differentiated into chondroblasts. Electron microscopy showed that the immunoreactivity for 1,25(OH)2D3 receptor, indicated by gold particles, was associated with scattered clumps of compact chromatin and small clumps of dispersed chromatin. But the nuclei immunostaining patterns before and after mitosis were different in proliferative chondrocytes. The heterochromatin along the nuclear envelope was immunonegative in interphase chondrocytes, but there was VDR immunostaining over the rim of the perinuclear chromatin just after mitosis. In the nucleoli, the dense fibrillar component was immunostained, but the fibrillar centers and the perinuclear chromatin were not. This distribution of VDR immunoreactivity suggests that the hormone is directly involved in differentiation, proliferation and maturation of cartilage cells, and also with extracellular calcification in epiphyseal cartilage. The presence of immunoreactive VDR receptors in nucleoli of chondrocytes, particularly the fibrillar component, suggests that 1,25(OH)2D3 may be involved in regulation of ribosomal genes.
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Calatayud J, Allègre J, Mathieu H, Magnéa N, Mariette H. Piezoreflectance in CdTe/(Cd,Zn)Te strained-layer superlattices: Periodicity effect, valence-band offset, and exciton binding energies. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:9684-9692. [PMID: 10005039 DOI: 10.1103/physrevb.47.9684] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gil B, Lefebvre P, Bonnel P, Mathieu H, Deparis C, Massies J, Neu G, Chen Y. Uniaxial-stress investigation of asymmetrical GaAs-(Ga,Al)As double quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:1954-1960. [PMID: 10006231 DOI: 10.1103/physrevb.47.1954] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Berdal A, Hotton D, Pike JW, Mathieu H, Dupret JM. Cell- and stage-specific expression of vitamin D receptor and calbindin genes in rat incisor: regulation by 1,25-dihydroxyvitamin D3. Dev Biol 1993; 155:172-9. [PMID: 8380146 DOI: 10.1006/dbio.1993.1016] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
To investigate the extent of 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] action and its relationships to calbindin gene expression in mineralized tissues, we have analyzed rat incisors with different probes, including a vitamin D receptor (VDR) antibody and specific cDNAs to rat calbindin-D9K and calbindin-D28K. Developmental and hormonal controls of calbindin gene expression were investigated by Northern blot analysis of ameloblast and odontoblast mRNA. Distribution and hormone-induced changes of VDR were also studied by light microscopic immunocytochemistry. A differential tissue- and stage-specific expression of the calbindin genes was observed in microdissected portions of the continuously erupting incisor. The two calbindins were expressed in ameloblasts, whereas only calbindin-D28K was expressed in odontoblasts. Moreover, in ameloblasts, expression of calbindin-D28K preceded that of calbindin-D9K. Immunoreactivity for VDR was present in all progenitor cells and progressively decreased during the differentiation process, whereas, in differentiated tissues, a hormonal upregulation was restricted to hard tissue-forming cells, i.e., ameloblasts and odontoblasts. Furthermore, calbindin gene expression appeared to be regulated by 1,25(OH)2D3. Taken together, these data indicate that ameloblasts and odontoblasts are target cells for 1,25(OH)2D3 and provide the first insights into the hormonal control of tooth genes during development.
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Arnaud G, Allègre J, Lefebvre P, Mathieu H, Howard LK, Dunstan DJ. Photoreflectance and piezophotoreflectance studies of strained-layer InxGa1-xAs-GaAs quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:15290-15301. [PMID: 10003646 DOI: 10.1103/physrevb.46.15290] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lefebvre P, Christol P, Mathieu H. Excitons in semiconductor superlattices: Heuristic description of the transfer between Wannier-like and Frenkel-like regimes. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:13603-13606. [PMID: 10003411 DOI: 10.1103/physrevb.46.13603] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mathieu H, Lefebvre P, Christol P. Simple analytical method for calculating exciton binding energies in semiconductor quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:4092-4101. [PMID: 10004139 DOI: 10.1103/physrevb.46.4092] [Citation(s) in RCA: 136] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lambert-Zechovsky N, Bingen E, Denamur E, Brahimi N, Brun P, Mathieu H, Elion J. Molecular Analysis Provides Evidence for the Endogenous Origin of Bacteremia and Meningitis Due to Enterobacter cloacae in an Infant. Clin Infect Dis 1992; 15:30-2. [PMID: 1352150 DOI: 10.1093/clinids/15.1.30] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We analyzed the restriction fragment length polymorphism (RFLP) of total DNA and of ribosomal DNA regions (ribotyping) to document the occurrence of endogenous, systemic bacteremia and meningitis due to Enterobacter cloacae in a newborn. Five strains of E. cloacae were isolated from this newborn. Three of these strains were recovered from stool at counts of 10(8), 10(9), and 10(9) organisms/g of feces, respectively; one strain was isolated from blood; and one strain was isolated from cerebrospinal fluid. In addition, five epidemiologically unrelated strains of E. cloacae were studied for comparison. Our study clearly shows the genetic relatedness of the strains isolated sequentially from cultures of stool, blood, and cerebrospinal fluid. RFLP analysis of total DNA and ribotyping seem particularly well suited to the study of the epidemiology of nosocomial E. cloacae strains.
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Lefebvre P, Bonnel P, Gil B, Mathieu H. Resonant tunneling via stress-induced valence-band mixings in GaAs-(Ga,Al)As asymmetrical double quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:5635-5647. [PMID: 9998404 DOI: 10.1103/physrevb.44.5635] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Berdal A, Nanci A, Smith CE, Ahluwalia JP, Thomasset M, Cuisinier-Gleizes P, Mathieu H. Differential expression of calbindin-D 28 kDa in rat incisor ameloblasts throughout enamel development. Anat Rec (Hoboken) 1991; 230:149-63. [PMID: 1867392 DOI: 10.1002/ar.1092300202] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Calbindin-D 28 kDa (CaBP 28 kDa), a vitamin D-dependent calcium-binding protein, has been associated with calcium handling by cells. We have investigated the expression of this protein in the rat incisor enamel organ, an epithelium interposed between a mineralizing matrix and connective tissue rich in blood vessels, by radioimmunoassay (RIA), Western blotting, and quantitative protein A-gold immunocytochemistry with antibodies to rat kidney CaBP 28 kDa. RIA of cytosolic extracts showed that enamel organs contained relatively high concentrations of CaBP 28 kDa (compared to kidney; see review by Christakos S., C. Gabrielides, and W.B. Rhoten 1989 Endocr. Rev., 10:3-25). Immunoblotting of proteins extracted from enamel organ strips revealed an intensely-stained band near 28 kDa throughout amelogenesis following ameloblast differentiation. Immunocytochemically, CaBP 28 kDa was localized exclusively within ameloblasts. The density of labelling increased from the presecretory stage to the secretory stage and fluctuated across the maturation stage in relation to ameloblast modulation. Ruffle-ended ameloblasts consistently showed the most intense immunoreaction. Gold particles were present throughout the cytoplasm and nuclei of ameloblasts but regions rich in rough endoplasmic reticulum or cell webs showed a higher immunolabelling. Some gold particles were also associated with the external face of the rough endoplasmic reticulum. Multivesicular bodies in maturation stage ameloblasts were occasionally immunoreactive. These data suggest that the intracellular concentration of CaBP 28 kDa is regulated throughout amelogenesis reflecting a stage-specific control of calcium homeostasis in ameloblasts.
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Balmain N, Hotton D, Cuisinier-Gleizes P, Mathieu H. Immunoreactive calbindin-D9K in bone matrix vesicle. HISTOCHEMISTRY 1991; 95:459-69. [PMID: 1869447 DOI: 10.1007/bf00315741] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This electron microscope study describes the subcellular occurrence and distribution of immunoreactive calbindin-D9K in the trabecular metaphyseal and compact cortical bone of normal rats, rachitic vitamin-D-deficient rats, and rachitic rats given 1,25-(OH)2D3. Undecalcified bones were embedded in Lowicryl K4M and calbindin-D9K antigenicity was detected by the protein A-gold method. Immunoreactive calbindin-D9K was localized in the cytoplasm and cell processes of osteoblasts and osteocytes. Immunoreactive calbindin-D9K was also found within matrix vesicles and calcifying matrix vesicles, where it lay over the needle-shaped crystallites, at the apparent site of initial crystal formation, but not along the whole crystallites. In fully mineralized bone it occurred at the same site, over the crystallites. Calibindin-D9K was vitamin-D-dependent in the osteoblasts and matrix vesicles, where its presence was correlated with the reappearance of crystallites in 1,25-(OH)2D3-treated vitamin-D-deficient rats. This suggests that immunoreactive calbindin-D9K is involved in mineral deposition in bone matrix vesicles. Abnormal intracellular calcification associated with calbindin-D9K antigenicity in the osteoblasts of 1,25-(OH)2D3-treated vitamin-D-deficient rats indicates that immunoreactive calbindin-D9K may also play a part in abnormal intracellular mineral deposition.
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Mathieu H, Allègre J, Gil B. Piezomodulation spectroscopy: A powerful investigation tool of heterostructures. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:2218-2227. [PMID: 9997494 DOI: 10.1103/physrevb.43.2218] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Berdal A, Hotton D, Kamyab S, Cuisinier-Gleizes P, Mathieu H. Subcellular co-localization and co-variations of two vitamin D-dependent proteins in rat ameloblasts. Arch Oral Biol 1991; 36:715-25. [PMID: 1747073 DOI: 10.1016/0003-9969(91)90038-v] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The immunocytochemical patterns of calbindin-D9k (CaBP 9k) and calbindin-D28k (CaBP 28k) were compared by light and electron microscopy throughout amelogenesis. Labelling on serial sections and co-localization of CaBPs confirmed that the two proteins were restricted to a single cell type, the ameloblasts. Their quantity increased during presecretion, was stable during secretion and alternately high and low during the cyclic modulation of ameloblasts which occurs during maturation. Ruffle-ended ameloblasts contained the highest apparent concentration. Investigations with several fixatives indicated that the CaBPs were present in the cytosol and the nucleus, although there were slight differences with various fixatives by light microscopy. Their concentrations in these compartments varied in parallel throughout amelogenesis. However, mitochondria contained only immunoreactive CaBP 9k. While the distribution of CaBP 9k in zones containing Golgi apparatus and rough endoplasmic reticulum was similar, CaBP 28k concentration has, in another paper, been shown to be higher near the rough endoplasmic reticulum.
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Bonnel P, Lefebvre P, Gil B, Mathieu H, Deparis C, Massies J, Neu G, Chen Y. Reflectance study of interwell couplings in GaAs-Ga1-xAlxAs double quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:3435-3443. [PMID: 9995857 DOI: 10.1103/physrevb.42.3435] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Allegre J, Calatayud J, Gil B, Mathieu H, Tuffigo H, Lentz G, Magnea N, Mariette H. Identification of valence subbands in CdTe-Cd1-xZnxTe strained-layer quantum wells by differential spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:8195-8202. [PMID: 9993142 DOI: 10.1103/physrevb.41.8195] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bingen E, Lambert-Zechovsky N, Mariani-Kurkdjian P, Doit C, Aujard Y, Fournerie F, Mathieu H. Bacterial counts in cerebrospinal fluid of children with meningitis. Eur J Clin Microbiol Infect Dis 1990; 9:278-81. [PMID: 2112465 DOI: 10.1007/bf01968060] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Eighty-five cerebrospinal fluid (CSF) specimens from the same number of pediatric patients with meningitis were examined to determine the bacterial count and the relationship of this count to the microscopy results, the ages of the patients and the bacterial species isolated. Bacterial counts ranged from 2 x 10 to 4 x 10(9) CFU/ml CSF. Twenty-five percent of the 85 CSF specimens positive for Haemophilus influenzae type b, Neisseria meningitidis, Streptococcus pneumoniae, Escherichia coli K1 and group B streptococci had counts of 10(7) CFU/ml or higher. Children between 1 and 6 months of age had significantly higher counts (p less than 0.05) than the other age groups. The three patients who had positive CSF cultures 24 h after the start of therapy all had initial bacterial counts of 10(7) CFU/ml or higher. The detection limit for Gram stain/microscopy was 10(5) CFU/ml. No correlation was found between bacterial count and the number of polymorphonuclear leukocytes.
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Mathieu H, Chatt A, Allegre J, Faurie JP. Subband structure of strained-layer CdTe/ZnTe superlattices: A reexamination. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:6082-6085. [PMID: 9994498 DOI: 10.1103/physrevb.41.6082] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gil B, Mathieu H, Massies J, Neu G, Fukunaga T, Nakashima H. Line-shape analysis of the reflectivity spectra of GaAs/(Ga,Al)As single quantum wells grown on (001)- and (311)-oriented substrates. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:2885-2889. [PMID: 9994055 DOI: 10.1103/physrevb.41.2885] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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