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  • 1
    Electronic Resource
    Electronic Resource
    Metal oxidation state effect in photoionization of gas-phase metal halides (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 3555-3565 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The full-valence photoelectron (PE) spectrum of SnCl4 excited by synchrotron radiation in the ultraviolet (UV) region is reported here for the first time, and compared with the analogous spectrum of SnCl2 previously published. Electron correlation effects in the different valence spectral regions are experimentally and theoretically analyzed for both tin chlorides. The theoretical results are obtained at ab initio 2h-1p CI level. Total-ion-yield (TIY) spectra excited by synchrotron radiation are obtained for both molecules in the Sn 4d−1 thresholds region for the first time. Sn 4d excited states in the two chlorides are hence identified through the resonant features displayed by the TIY spectra. The assignment is in good qualitative agreement with the excitation energies and oscillator strengths calculated at ab initio CI level. Clear differences exhibited by both PE and TIY spectra reported in this work originate from the different metal oxidation state in the two apparently similar chlorides, or equivalently, from the different involvement of the valence atomic orbitals of tin to form the chemical bonds of the molecule. Inner-valence ionizations in the investigated molecules are shown to be a sensitive probe of the halogen chemical environment, being related to the Sn–Cl bond polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468579
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  • 2
    Electronic Resource
    Electronic Resource
    Open sutureless tension-free repair for primary inguinal hernia (1999)
    Springer
    Hernia 3 (1999), S. 121-124 
    Details
    ISSN: 1248-9204
    Keywords: Hernioplasty ; Outpatient surgery ; Prosthetic materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Since the first hernioplasty performed by Edoardo Bassini in 1884, all surgical reconstruction techniques have suffered from a common defect: tension on the suture line. This represents the main etiologic factor for recurrent hernia. With the introduction of modern prosthetic materials (meshes and plugs) it is possible to perform all hernia repairs without altering the normal anatomy, as well as avoiding undesired suture line tensions. Between January 1992 and December 1998 1405 open sutureless tension-free repairs were performed for primary inguinal hernia in 1317 patients. The number of patients treated with local anesthesia was 1235 (93.8%), with 63 (4.8%) treated under general anesthesia, and 19 (1.4%) with epidural anesthesia. In this series only 4 (0.3%) cases of intra-operative complication occurred (vagal crisis without consequences for the patients). Nine (0.6%) cases of early postoperative complications were noted, of which 8 involved vagal crisis and 1 hemorrhage. Forty six (3.4%) late postoperative complications occurred: 32 seromas accompanied by 3 massive inguino-scrotal edemas, 4 hematomas, and 10 wound infections without the necessity to remove the mesh in all cases. Six recurrences (0.4%) were noted after primary surgical repair. Mean follow-up time was 4 years (range 1–7 years). The proposed technique is simple, safe, and characterized by a rapid performing procedure giving an excellent outcome. The data presented confirms the experience of others reported in the world literature, with a low complication rate and lower cost for the community.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195309
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of Spartina alterniflora Loisel on trace metals accumulation in inter-tidal sediments (1997)
    Springer
    Mangroves and salt marshes 1 (1997), S. 201-209 
    Details
    ISSN: 1572-977X
    Keywords: salt marsh ; trace metals ; sediments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present the distribution of Cd and Zn in sediment cores taken under Spartina alterniflora Loisel. marsh and compare with adjacent mud flats without plant cover. Vertical distribution of Cd and Zn in the mud flat and S. alterniflora cores were different. From 0 to 5 cm of depth Zn and Cd concentrations did not change with depth in the two cores but were higher in the mud flat. From 5 to 15 cm, corresponding to maximum root biomass under S. alterniflora, Zn and Cd concentrations remained constant in the mud flat cores, but increased by a factor of nearly 4 under S. alterniflora. Below this depth concentrations dropped in both cores. Manganese distribution in S. alterniflora cores suggests that oxides are precipitated at the depth of maximum root biomass. More oxic environment under S. alterniflora (average Eh = +5 mV) with low sulfide concentration (0.58 mg l-1) relative to the mud flat cores (average Eh = –204 mV; sulfide 47.1 mg l-1), may favor Fe and Mn oxi-hydroxides precipitation, causing an accumulation of Cd and Zn at the root zone. In the mud flat cores, Zn and Cd highest concentrations were at the sediment water interface, where oxic waters favor their precipitation with Fe and Mn oxi-hydroxides. The results discourages the indiscriminate use of salt marsh sediments in environmental monitoring of trace metals, since the possibility of post-deposition mobilization of trace metals due to root metabolism, will make correlation with trace metal loading rates impossible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009990604727
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  • 4
    Electronic Resource
    Electronic Resource
    Contribution of immunophenotypic and genotypic analyses to the diagnosis of acute leukemia (1995)
    Springer
    Annals of hematology 71 (1995), S. 13-27 
    Details
    ISSN: 1432-0584
    Keywords: Acute leukemia ; Diagnosis ; Immunophenotypic ; Cytogenetics ; Molecular genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Diagnostic accuracy in acute leukemia (AL) can be improved if traditional morphology and cytochemistry are supplemented with immunophenotypic and genotypic analyses. This multiparameter approach is of crucial importance for the management of patients, as it enables the identification of leukemic syndromes with distinct biological features and response to treatment. Immunophenotyping using monoclonal antibodies has been universally accepted as a useful adjunct to morphological criteria. This technique is particularly valuable in diagnosing and subclassifying acute lymphoblastic leukemia and is also essential in certain types of acute myeloid leukemia (AML), such as AML with minimal differentiation or acute megakaryoblastic leukemia. Cytogenetic findings can be quite helpful in establishing the correct diagnosis and can add information of prognostic significance. A number of specific chromosomal abnormalities have been recognized that are very closely, and sometimes uniquely, associated with morphologically and clinically distinct subsets of leukemia. An even more basic understanding of normal and malignant hematopoietic cells has begun to evolve as molecular biology begins to unravel gene misprogramming by Southern and Northern blot analysis, the polymerase chain reaction, and fluorescence in situ hybridization. With the extensive use of these techniques it has become apparent that a proportion of leukemias exhibit the biologically relevant molecular defect in the absence of a karyotypic equivalent. On the other hand, apparently uniform chromosomal abnormalities such as the t(1;19) (q23;p13), t(9;22) (q33;q11), t(8;14) (q24;q32), or t(15;17) (q21;q21) may differ at the molecular level. Data collected from these modern technologies have introduced a greater complexity, which needs to be taken into consideration to improve both the diagnostic precision and the reproducibility of current classifications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01696228
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  • 5
    Electronic Resource
    Electronic Resource
    Minimally differentiated acute myeloid leukemia (AML-MO): a distinct clinico-biologic entity with poor prognosis (1996)
    Springer
    Annals of hematology 72 (1996), S. 208-215 
    Details
    ISSN: 1432-0584
    Keywords: Key words AML-M0 ; Anti-MPO ; Complex karyotypes ; MDR phenotype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  FAB proposals for the diagnosis of AML-M0 represent the formal recognition of a distinct entity which has been described over the past few years by several authors and called minimally differentiated acute myeloid leukemia. By definition, AML-M0 includes acute leukemias which do not fit morphological and cytochemical criteria for the diagnosis of AML, and for which myeloid lineage assignment can be made by immunological assay showing positivity for MPO, CD13, and CD33 and negativity for lymphoid markers. Involvement of an early myeloid progenitor in the leukemic process is a possible theory hypothesized to explain the existence of such a form. Validity of this assumption has been based on the observation that AML-M0 frequently bears "stem cell" markers such as CD34, HLA-DR, Tdt, CD7, and promiscuous IgH/TCR gene rearrangements, which are thought to occur in uncommitted cells. Finally, AML-M0 very frequently carries cytogenetic abnormalities common to MDS or secondary AML, such as -5/5q- or -7/7q- deletions and or complex karyotype. In our experience, AML-M0 is also very often associated with the MDR phenotype, which in turn has been found strictly linked to "stem cell" features, especially in MDS. These biological aspects, altogether, translate into a very unfavorable prognosis, confirming even from a clinical point of view that AML-M0 is a distinct entity. In conclusion, "stem cell" markers, MDR phenotype, complex chromosome lesions, frequent occurrence in elderly patients, and intrinsic chemoresistance characterize AML-M0 and indicate the need for tailored treatments, possibly involving the use of MDR modulators and/or differentiating agents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002770050162
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  • 6
    Electronic Resource
    Electronic Resource
    The gas-phase photoemission beamline at Elettra (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 565-568 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: This paper reports the present stage of commissioning of the gas-phase photoemission beamline at Elettra, Trieste. The beamline is designed for atomic and molecular science experiments with high-resolution and high-flux synchrotron radiation. It consists of an undulator source, variable-angle spherical-grating monochromator and two experimental stations. The design value of the energy range is 20 to 800 eV with a specified resolving power of over 10000. The procedure adopted for calibration of this type of monochromator is discussed. At present a resolving power up to 20000 and a range up to 900 eV have been measured. Absorption spectra taken at the argon LII,III-edge and at the nitrogen, oxygen and neon K-edges are as sharp as, or sharper than, any reported in the literature. The instrumental broadening is well below the natural line-width making it difficult to quantify the resolution; this problem is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090904959800065X
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrasonographic evaluation of the cervical lymph nodes in preoperative staging of esophageal neoplasms (1998)
    Springer
    Abdominal imaging 23 (1998), S. 275-277 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Ultrasound—Esophageal cancer—Cervical lymph node metastasis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: The detection of cervical lymph node metastases plays an important role in staging of patients affected by esophageal cancer to perform the best therapeutic approach. Methods: We report our experience concerning the ultrasound evaluation of the cervical area in 174 patients with esophageal cancer. Ultrasonographic evaluation of the neck can be done with a 7.5- or 10 MHz transducer in all cases, with selective scanning of the lymph node chains of the internal jugular veins and supraclavicular regions. The short-to-long axis ratio (S/L) was a useful way to detect lymph node metastasis. Histopathologic diagnoses were obtained by sonographically guided fine-needle aspiration biopsy. Results: At ultrasound examination, we found 18 (10.3%) patients with metastatic cervical nodes. Of these, 17 (94.4%) had metastatic cervical lymph nodes confirmed by cytology from fine-needle biopsy. Lymph node exceeding 5 mm in long axis and with an S/L over 0.5 showed a higher incidence of metastasis than those with an S/L under 0.5. Our experience shows a high incidence of lymph node metastases in patients with esophageal cancer localized to the thoracic supracarinal tract and in patients with cervical and lower esophageal cancer. Conclusion: In the ultrasound evaluation of nodes, the most useful parameters are size of nodes, heterogeneity of internal echoes, morphology of the margins, and the deformation caused by compressive instrumental manipulation. These criteria, indicated by the Japanese Society for Esophageal Diseases, yield a high sensitivity and diagnostic specificity when the ultrasonographic studies are performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900338
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  • 8
    Electronic Resource
    Electronic Resource
    Immunohistochemical analysis of C-protein isoforms in cardiac and skeletal muscle of the axolotl, Ambystoma mexicanum (1995)
    Springer
    Cell & tissue research 282 (1995), S. 399-406 
    Details
    ISSN: 1432-0878
    Keywords: Key words: C-protein ; Isoforms ; Cardiac muscle ; Skeletal muscle ; Western blots ; Immunofluorescent microscopy ; Axolotl ; Ambystoma mexicanum (Urodela)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Of the several proteins located within sarco-meric A-bands, C-protein, a myosin binding protein (MyBP) is thought to regulate and stabilize thick filaments during assembly. This paper reports the characterization of C-protein isoforms in juvenile and adult axolotls, Ambystoma mexicanum, by means of immunofluorescent microscopy and Western blot analyses. C-protein and myosin are found specifically within the A-bands, whereas tropomyosin and α-actin are detected in the I-bands of axolotl myofibrils. The MF1 antibody prepared against the fast skeletal muscle isoform of chicken C-protein specifically recognizes a cardiac isoform (Axcard1) in juvenile and adult axolotls but does not label axolotl skeletal muscle. The ALD66 antibody, which reacts with the C-protein slow isoform in chicken, local- izes only in skeletal muscle of the axolotl. This slow axolotl isoform (Axslow) displays a heterogeneous distribution in fibers of dorsalis trunci skeletal muscle. The C315 antibody against the chicken C-protein cardiac isoform identifies a second axolotl cardiac isoform (Axcard2), which is present also in axolotl skeletal muscle. No C-protein was detected in smooth muscle of the juvenile and adult axolotl with these antibodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050491
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  • 9
    Electronic Resource
    Electronic Resource
    Immunohistochemical analysis of C-protein isoforms in cardiac and skeletal muscle of the axolotl, Ambystoma mexicanum (1995)
    Springer
    Cell & tissue research 282 (1995), S. 399-406 
    Details
    ISSN: 1432-0878
    Keywords: C-protein ; Isoforms ; Cardiac muscle ; Skeletal muscle ; Western blots ; Immunofluorescent microscopy ; Axolotl, Ambystoma mexicanum (Urodela)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Of the several proteins located within sarcomeric A-bands, C-protein, a myosin binding protein (MyBP) is thought to regulate and stabilize thick filaments during assembly. This paper reports the characterization of C-protein isoforms in juvenile and adult axolotls, Ambystoma mexicanum, by means of immunofluorescent microscopy and Western blot analyses. C-protein and myosin are found specifically within the A-bands, whereas tropomyosin and α-actin are detected in the I-bands of axolotl myofibrils. The MF1 antibody prepared against the fast skeletal muscle isoform of chicken C-protein specifically recognizes a cardiac isoform (Axcard1) in juvenile and adult axolotls but does not label axolotl skeletal muscle. The ALD66 antibody, which reacts with the C-protein slow isoform in chicken, localizes only in skeletal muscle of the axolotl. This slow axolotl isoform (Axslow) displays a heterogeneous distribution in fibers of dorsalis trunci skeletal muscle. The C315 antibody against the chicken C-protein cardiac isoform identifies a second axolotl cardiac isoform (Axcard2), which is present also in axolotl skeletal muscle. No C-protein was detected in smooth muscle of the juvenile and adult axolotl with these antibodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318872
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