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  • 1
    Electronic Resource
    Electronic Resource
    7Li nuclear magnetic resonance spectra and relaxation in Ni1−xLixO : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6621-6623 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 7Li nuclear magnetic resonance (NMR) spectra and relaxation rates in Ni1−xLixO, for 0.01≤x≤0.46 and for 20≤T≤550 K are presented. For x≤0.2 the antiferromagnetic (AF) phase typical of NiO is still observed. The Neel temperatures TN(x), the temperature dependence of the field at the Li site, and the role of the extra holes in driving the correlated spin dynamics of Ni2+ are derived. In particular, from 7Li relaxation rates W the hopping frequencies of the holes on the AF background and the energy gaps between itinerant and localized states are extracted. In the mixed regime (x≥0.3, LiNiO2 structure-type) in which partial ordering on alternate Li+ and Ni3+ layers occurs, 7Li NMR data display the features typical of disordered paramagnets, consistent with a picture of random distribution of Ni3+ (S=1/2), Ni2+ (S=1) and of spin vacancies Li+ (S=0). In particular, for x=0.46, on cooling, a paramagnetic-like divergence of the width and of the shift of the NMR line is observed while 7Li W's indicate slowing down of the spin fluctuations. The fluctuation frequency decreases in the MHz range below a freezing temperature Tf(approximately-equal-to)40 K. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361903
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  • 2
    Electronic Resource
    Electronic Resource
    Anion exchange protein (band 3) in human erythrocytes characterized by different abnormalities
    Amsterdam : Elsevier
    Clinica Chimica Acta 220 (1993), S. 211-217 
    Details
    ISSN: 0009-8981
    Keywords: Band 3 protein ; G6PD deficiency ; Hereditary spherocytosis (human erythrocytes) ; PK deficiency
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-8981(93)90049-A
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  • 3
    Electronic Resource
    Electronic Resource
    Mean values of hormones involved in male reproduction at different ages
    Amsterdam : Elsevier
    Journal of Steroid Biochemistry 14 (1981), S. xix 
    Details
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-4731(81)90092-3
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  • 4
    Electronic Resource
    Electronic Resource
    Noradrenergic and dopaminergic interrelation in schizophrenia
    Amsterdam : Elsevier
    Psychiatry Research 53 (1994), S. 231-242 
    Details
    ISSN: 0165-1781
    Keywords: Apomorphine ; clonidine ; growth hormone ; positive and negative symptoms ; prolactin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-1781(94)90052-3
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  • 5
    Electronic Resource
    Electronic Resource
    Purification of iron superoxide dismutase from the cyanobacterium Anabaena cylindrica Lemm. and localization of the enzyme in heterocysts by immunogold labeling (1992)
    Springer
    Planta 187 (1992), S. 438-444 
    Details
    ISSN: 1432-2048
    Keywords: Anabaena ; Heterocyst ; Iron-superoxide dismutase (immunogold labeling)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Iron superoxide dismutase (Fe-SOD; EC 1.15.1.1) was isolated from the nitrogen-fixing cyanobacterium Anabaena cylindrica Lemm. Polyacrylamide gel electrophoresis separated the purified protein into three closely running, enzymatically active bands. The molecular weight of the enzyme was estimated by gel filtration to be about 40 kDa. Polyclonal antibodies were produced by immunization of rabbits with the isolated enzyme, and were purified on a column of protein A-Sepharose. The Fe-SOD antibody reacted with the purified Fe-SOD and also specifically recognized the protein in extracts of A. cylindrica. In the extracts, anti-Fe-SOD did not cross-react with Mn-SOD, an enzyme which belongs to an SOD class displaying high homology of primary and three-dimensional structure with respect to Fe-SOD. Iron superoxide dismutase was localized in heterocysts by immunogold labeling and transmission electron microscopy. These results are the first in-situ evidence for the presence of SOD in the cells specialized for nitrogenase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00199961
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  • 6
    Electronic Resource
    Electronic Resource
    Expression and localization of polygalacturonase during the outgrowth of lateral roots in Allium porrum L. (1992)
    Springer
    Planta 188 (1992), S. 164-172 
    Details
    ISSN: 1432-2048
    Keywords: Allium (polygalacturonase) ; Morphogenesis (lateral root) ; Pectin ; Polygalacturonase (immunolocalization) ; Root morphogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The presence of polygalacturonase and its correlation with the formation of lateral roots in leek (Allium porrum L.) seedlings have been investigated. During root growth, a steady increase in polygalacturonase activity was associated with that of the lateral root primordia. Fractionation of root extract by fast protein liquid chromatography resolved at least two polygalacturonase isoforms. One of the isoforms, a 75-kdalton protein, strongly reacted on Western blots probed with a polyclonal antibody raised against tomato polygalacturonase. It also reacted with both polyclonal and monoclonal antisera raised against Fusarium moniliforme polygalacturonase. In situ localization with these three antibodies showed that polygalacturonase was present over the meristems of lateral root primordia. Antibodies against pectins (Knox et al. 1990, Planta 181, 512–521) detected large amounts of pectic material filling the area between the apex of the primordium and the mother root tissues. We suggest that a polygalacturonase plays an important role in leek root morphogenesis, particularly during lateral root outgrowth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216810
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  • 7
    Electronic Resource
    Electronic Resource
    Monoclonal antibodies that react with human band 3 residues 542–555 recognize different conformations of this protein in uninfected andPlasmodium falciparum infected erythrocytes (1995)
    Springer
    Molecular and cellular biochemistry 144 (1995), S. 117-123 
    Details
    ISSN: 1573-4919
    Keywords: human band 3 protein ; Plasmodium falciparum ; cytoadherence ; monoclonal antibody ; epitope conformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A monoclonal antibody generated against synthetic peptides patterned on amino acids 542–555 of human band 3, designated 1F4, specifically immunostainedPlasmodium falciparum-infected erythrocytes and inhibited the cytoadherence ofP. falciparum-infected erythrocytes to C32 amelanotic melanoma cells. 1F4 did not recognize intact band 3 protein on immunoblots, however it was reactive towards proteolytic fragments of band 3. The binding region of another murine monoclonal antibody previously reported to recognize the membrane spanning domain of human band 3, designated B6, was found to also recognize residues 542–555, however its properties differed from 1F4. Mab B6 recognized both infected and uninfected red cells, and reacted only with intact band 3 on immunoblots. Mab B6 was without effect on cytoadherence. These results demonstrate that monoclonal antibodies reactive against a common peptide sequence may bind to different conformations of the peptide sequence and suggest that the adherent competency ofP. falciparum-infected erythrocytes may result from a change in the surface topography of human band 3 protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944390
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  • 8
    Electronic Resource
    Electronic Resource
    An immunological and genetic study of patients with gestational diabetes mellitus (1996)
    Springer
    Acta diabetologica 33 (1996), S. 139-144 
    Details
    ISSN: 1432-5233
    Keywords: Key words  Gestational diabetes mellitus ; Autoimmunity ; Lymphocyte subsets ; Histocompatibility antigens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract   The aim of the study was to evaluate the frequency of islet cell (ICA) and insulin (IAA) antibodies and of HLA antigen typing in a group of subjects diagnosed with gestational diabetes mellitus (GDM) in a screening-diagnostic program during pregnancy. ICA, complement-fixing (CF) ICA and other autoantibodies, absolute number and percentage of lymphocyte subpopulations, and HLA antigens were evaluated in 68 women with GDM and compared with those of matched controls. ICA were found in 2 (2.9%) and IAA in 1 (1.5%). Both ICA-positive women had CF-ICA; one of them was receiving insulin therapy, while the other was on a special diet. No correlations were found between ICA and IAA, nor between IAA and insulin treatment. As far as lymphocyte subsets were concerned, we found a significant increase in the absolute number of total and activated (CD3+HLA-DR+) T lymphocytes and a significant increase in the absolute number and percentage of suppressor/cytotoxic T lymphocytes (CD8) and NK lymphocytes (CD57) in GDM patients compared with normal pregnant controls. Concerning frequency for HLA A, B, C, DR antigens in the GDM population, only Cw7 was found to be significantly increased and A10 significantly decreased in comparison with controls. Our study suggests that GDM is a heterogeneous disorder in which few patients present with the immunologic and genetic markers of type 1 diabetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00569424
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  • 9
    Electronic Resource
    Electronic Resource
    An immunological and genetic study of patients with gestational diabetes mellitus (1996)
    Springer
    Acta diabetologica 33 (1996), S. 139-144 
    Details
    ISSN: 1432-5233
    Keywords: Gestational diabetes mellitus ; Autoimmunity ; Lymphocyte subsets ; Histocompatibility antigens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of the study was to evaluate the frequency of islet cell (ICA) and insulin (IAA) antibodies and of HLA antigen typing in a group of subjects diagnosed with gestational diabetes mellitus (GDM) in a screening-diagnostic program during pregnancy. ICA, complement-fixing (CF) ICA and other autoantibodies, absolute number and percentage of lymphocyte subpopulations, and HLA antigens were evaluated in 68 women with GDN and compared with those of matched controls. ICA were found in 2 (2.9%) and IAA in 1 (1.5%). Both ICA-positive women had CF-ICA; one of them was receiving insulin therapy, while the other was on a special diet. No correlations were found between ICA and IAA, nor between IAA and insulin treatment. As far as lymphocyte subsets were concerned, we found a significant increase in the absolute number of total and activated (CD3+HLA-DR+) T lymphocytes and a significant increase in the absolute number and percentage of suppressor/cytotoxic T lymphocytes (CD8) and NK lymphocytes (CD57) in GDM patients compared with normal pregnant controls. Concerning frequency for HLA A, B, C, DR antigens in the GDM population, only Cw7 was found to be significantly increased and A10 significantly decreased in comparison with controls. Our study suggests that GDM is a heterogeneous disorder in which few patients present with the immunologic and genetic markers of type 1 diabetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00569424
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrastructural features of megasporogenesis inTorreya nucifera (Taxaceae) (1996)
    Springer
    Plant systematics and evolution 202 (1996), S. 13-25 
    Details
    ISSN: 1615-6110
    Keywords: Taxaceae ; Torreya nucifera ; Megasporogenesis ; megasporocyte ; megaspore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In megasporogenesis ofTorreya nucifera (Taxaceae) more than one product of meiosis can start to germinate, a process previously observed inTaxus. Ultrastructural analysis ofT. nucifera revealed that this behaviour is cytologically determined by the presence of a transfer cell type wall-membrane apparatus and by the presence of uncommonly complex plasmalemmasomes in the megasporocyte. These features may determine a uniform supply of nutrients to the entire megasporocyte cytoplasm, so that after meiosis the germination potential is not restricted to the chalazal megaspore. Even if more than one product of meiosis can originate the female gametophyte in bothTaxus andTorreya, this process involves different ultrastructural aspects in the two species. In conclusion, the extension of the germination potential is a common characteristic to both species but it is most probably the result of some evolutionary convergence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985815
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