Dermatophyte Morphology: A Scanning Electron Microscopy Study

The Dermatophytes are a broad group of fungi belonging to the class Fungii imperfecti that are the causative agents of dermophytosis (ringworm infections). The present work offers an overview of the morphology of these fungi found in cultures according to the scanning electron microscope. The fungi were obtained from cultures left to develop over variable periods of time that would be sufficient for growth. The morphological features of some dermatophytes obtained in artificial cultures are detailed: M. canis, M. gypseum, M. audouini, M. cookei, T. mentagrophytes, T. schoulemu, T. verrucosuin, T. ajelloi, T. prohferans, and E. floccosum. In all cases an analysis of the morphology of the reproductive mycelium developed in the culture was made: hyphae, macroconidia, microconidia, and chlamydospores; details that serve to distinguish one fungus from another. In the perfect forms, the morphology of the peridial hyphae and of the ascocarps (cleistotethia) are described

Carrier and Light Trapping in Graded Quantum Well Laser Structures

We investigated the carrier and light trapping in GaInAs/AlGaAs single quantum well laser structures by means of time resolved photoluminescence and Raman spectroscopy. The influence of the shape and depth of the confinement potential and of the cavity geometry was studied by using different AlGaAs/GaAs short-period superlattices as barriers. Our results show that grading the optical cavity improves considerably both carrier and light trapping in the quantum well, and that the trapping efficiency is enhanced by increasing the graded confining potential.Comment: PDF-format, 15 pages (including 4 figures), Applied Physics Letters (June 2000

Crossover from Electronic to Atomic Shell Structure in Alkali Metal Nanowires

After making a cold weld by pressing two clean metal surfaces together, upon gradually separating the two pieces a metallic nanowire is formed, which progressively thins down to a single atom before contact is lost. In previous experiments [1,2] we have observed that the stability of such nanowires is influenced by electronic shell filling effects, in analogy to shell effects in metal clusters [3]. For sodium and potassium at larger diameters there is a crossover to crystalline wires with shell-closings corresponding to the completion of additional atomic layers. This observation completes the analogy between shell effects observed for clusters and nanowires.Comment: 4 page

Self-Contempt, the Working Alliance and Outcome in Treatments for Borderline Personality Disorder: An Exploratory Study.

Objective. We examined the role of expressed self-contempt in therapy for borderline personality disorder (BPD). Based on previous literature on BPD, we assumed an association between the self-contempt and the core symptoms of BPD. We also studied the progression of expressed self-contempt during the treatment and its effect on the alliance and the outcomes of treatment.Method. We rated the expressed self-contempt in 148 tape-recorded sessions with patients with BPD (N = 50), during a brief psychiatric treatment. We rated self-contempt at three time-points, using an observer-rate scale. Self-reported questionnaires were used to assess symptoms and the working alliance.Results. There are some associations between self-contempt and BPD symptoms. Expressed self-contempt did not change during the treatment. One measure of self-contempt was associated with a weaker alliance rated by the patients and with a stronger alliance rated by the therapists. The expression of high self-contempt was not predictive of outcomes when the initial level of problems was controlled for.Conclusions. The results highlight the importance to examine the complex effects of self-contempt in BPD undergoing treatment in a differentiated manner and suggest to clinicians and researchers to be attentive to this specific emotional state, and change therein, in psychotherapy.Keywords: Self-contempt; Borderline Personality Disorder; Brief Treatment; Therapeutic Alliance; EmotionTrial registration: ClinicalTrials.gov identifier: NCT01896024

Crystallization Kinetics of LaF3 Nanocrystals in an Oxyfluoride Glass

Nanocrystallization of LaF3 in a glass of composition 55SiO2– 20Al2O3–15Na2O–10LaF3 (mol%) has been achieved by heat treatment above the glass transition temperature. A maximum crystal size of 14 nm has been attained, with the crystalline fraction and crystal size dependent on the time and temperature of thermal treatment. The effect of lanthanum fluoride crystallization is noticeable from the microstructural and compositional changes in the glass matrix, which have been studied using several techniques, including viscosity, dilatometry, X-ray diffraction, and quantitative Rietveld refinement, transmission electron microscopy, and differential scanning calorimetry. The crystallization mechanism is shown to occur via regions of La- and Si-phase separation in the glass, from which the fluoride crystals develop during heat treatment. The interface between the glass matrix and the crystals in the demixed ranges is enriched in network formers, mainly SiO2, creating a viscous barrier, which inhibits further crystal growth and limits the crystal size to the nanometric range.Peer reviewe

Single Cord Blood Combined with HLA-Mismatched Third Party Donor Cells: Comparable Results to Matched Unrelated Donor Transplantation in High-Risk Patients with Hematologic Disorders

AbstractMatched unrelated donor (MUD) transplantation is the first alternative in the absence of a matched sibling donor. For patients without a suitable adult donor, we have adopted the dual stem cell transplantation protocol consisting of cord blood (CB) in combination with CD34+ cells from a third party HLA-mismatched donor. We analyzed the outcomes of patients undergoing both procedures in a single center. Starting in 2004, a total of 20 patients with high-risk disease underwent 22 dual transplants and 25 patients underwent myeloablative MUD transplantation. The 30-day cumulative incidence of neutrophil engraftment was similar in both groups (91% and 95%), with a median time to engraftment of 14 and 16 days, respectively. Grade II-IV acute graft-versus-host disease was more frequent in the MUD group (40% versus 5%). Except for a tendency toward a higher incidence of viral hemorrhagic cystitis in the dual transplantation group, posttransplantation infectious events were comparable in the 2 groups. The 3-year cumulative incidence rates of relapse (41% versus 44%) and nonrelapse mortality (30% versus 25%) were similar in the MUD and dual transplantation cohorts. Estimated 3-year overall survival and disease-free survival were 47% and 41%, respectively, with no survival advantage for either group. In our experience, dual transplantation offers survival rates comparable to those from myeloablative MUD transplantation with similar nonrelapse mortality rates

A mutation in the melon Vacuolar Protein Sorting 41prevents systemic infection of Cucumber mosaic virus

[EN] In the melon exotic accession PI 161375, the gene cmv1, confers recessive resistance to Cucumber mosaic virus (CMV) strains of subgroup II. cmv1 prevents the systemic infection by restricting the virus to the bundle sheath cells and impeding viral loading to the phloem. Here we report the fine mapping and cloning of cmv1. Screening of an F2 population reduced the cmv1 region to a 132 Kb interval that includes a Vacuolar Protein Sorting 41 gene. CmVPS41 is conserved among plants, animals and yeast and is required for post-Golgi vesicle trafficking towards the vacuole. We have validated CmVPS41 as the gene responsible for the resistance, both by generating CMV susceptible transgenic melon plants, expressing the susceptible allele in the resistant cultivar and by characterizing CmVPS41 TILLING mutants with reduced susceptibility to CMV. Finally, a core collection of 52 melon accessions allowed us to identify a single amino acid substitution (L348R) as the only polymorphism associated with the resistant phenotype. CmVPS41 is the first natural recessive resistance gene found to be involved in viral transport and its cellular function suggests that CMV might use CmVPS41 for its own transport towards the phloem.The TILLING platform is supported by the Program Saclay Plant Sciences (SPS, ANR-10-LABX-40) and the European Research Council (ERC-SEXYPARTH). This work was supported by grants AGL2009-12698-C02-01 and AGL2012-40130-C02-01 from the Spanish Ministry of Science and Innovation, the Spanish Ministry of Econom and Competitiveness, through the "Severo Ochoa Programme for Centres of Excellence in R&D" 2016-2019 (SEV-2015-0533)" and the CERCA Programme/Generalitat de Catalunya.Giner, A.; Pascual, L.; Bourgeois, M.; Gyetvai, G.; Rios, P.; Picó Sirvent, MB.; Troadec, C.... (2017). A mutation in the melon Vacuolar Protein Sorting 41prevents systemic infection of Cucumber mosaic virus. Scientific Reports. 7:1-12. https://doi.org/10.1038/s41598-017-10783-31127Anderson, P. K. et al. Emerging infectious diseases of plants: pathogen pollution, climate change and agrotechnology drivers. Trends in Ecology & Evolution 19, 535–544, doi: 10.1016/j.tree.2004.07.021 (2004).Nicaise, V. Crop immunity against viruses: outcomes and future challenges. Frontiers in Plant Science 5, 660, doi: 10.3389/fpls.2014.00660 (2014).Kang, B.-C., Yeam, I. & Jahn, M. Genetics of plant virus resistance. Annual Review of Phytopathology 43, 581–621, doi: 10.1146/annurev.phyto.43.011205.141140 (2005).Fraser, R. S. S. The genetics of plant-virus interactions: implications for plant breeding. Euphytica 63, 175–185, doi: 10.1007/bf00023922 (1992).Truniger, V. & Aranda, M. Recessive resistance to plant viruses. Advances in virus research 119–159 (2009).Sanfaçon, H. Plant translationfactors and virus resistance. Viruses 7, 3392–3419, doi: 10.3390/v7072778 (2015).Yang, P. et al. PROTEIN DISULFIDE ISOMERASE LIKE 5-1 is a susceptibility factor to plant viruses. Proceedings of the National Academy of Sciences of the United States of America 111, 2104–2109, doi: 10.1073/pnas.1320362111 (2014).Ouibrahim, L. et al. Cloning of the Arabidopsis rwm1 gene for resistance to Watermelon mosaic virus points to a new function for natural virus resistance genes. The Plant Journal 79, 705–716, doi: 10.1111/tpj.12586 (2014).Rubio, M., Nicolaï, M., Caranta, C. & Palloix, A. Allele mining in the pepper gene pool provided new complementation effects between pvr2-eIF4E and pvr6-eIF(iso)4E alleles for resistance to pepper veinal mottle virus. Journal of General Virology 90, 2808–2814, doi: 10.1099/vir.0.013151-0 (2009).Ibiza, V. P., Cañizares, J. & Nuez, F. EcoTILLING in Capsicum species: searching for new virus resistances. BMC Genomics 11, 631–631, doi: 10.1186/1471-2164-11-631 (2010).Chandrasekaran, J. et al. Development of broad virus resistance in non-transgenic cucumber using CRISPR/Cas9 technology. Molecular Plant Pathology. doi: 10.1111/mpp.12375 (2016).Rodríguez-Hernández, A. et al. Melon RNA interference (RNAi) lines silenced for Cm-eIF4E show broad virus resistance. Molecular plant pathology 13, 755–763, doi: 10.1111/j.1364-3703.2012.00785.x (2012).Edwardson, J. R. & Christie, R. G. In CRC Handbook of Viruses Infecting Legumes (eds J.R. Edwardson & R.G. Christie) 293–319 (CRC Press, 1991).Roossinck, M. J. Cucumber mosaic virus, a model for RNA virus evolution. Molecular Plant Pathology 2, 59–63 (2001).Caranta, C. et al. QTLs involved in the restriction of Cucumber mosaic virus (CMV) long-distance movement in pepper. Theor Appl Genet 104, 586–591 (2002).Valkonen, J. P. & Watanabe, K. N. Autonomous cell death, temperature sensitivity and the genetic control associated with resistance to Cucumber mosaic virus (CMV) in diploid potatoes (Solanum spp). Theor Appl Genet 99, 996–1005 (1999).Ohnishi, S. et al. Multigenic system controlling viral systemic infection determined by the interactions between Cucumber mosaic virus genes and quantitative trait loci of soybean cultivars. Phytopathology 101, 575–582, doi: 10.1094/phyto-06-10-0154 (2011).Kobori, T., Satoshi, T. & Osaki, T. Movement of Cucumber mosaic virus is restricted at the interface between mesophyll and phloem pathway in Cucumis figarei. Journal of General Plant Pathology 66, 159–166, doi: 10.1007/pl00012939 (2000).Argyris, J. M., Pujol, M., Martín-Hernández, A. M. & Garcia-Mas, J. Combined use of genetic and genomics resources to understand virus resistance and fruit quality traits in melon. Physiologia Plantarum 155, 4–11, doi: 10.1111/ppl.12323 (2015).Diaz, J. A. et al. Potential sources of resistance for melon to nonpersistently aphid-borne viruses. Plant Disease 87, 960–964 (2003).Karchi, Z., Cohen, S. & Govers, A. Inheritance of resistance to Cucumber Mosaic virus in melons. Phytopathology 65, 479–481 (1975).Risser, G., Pitrat, M. & Rode, J. C. Etude de la résistance du melon (Cucumis melo L.) au virus de la mosaïque du concombre. Ann Amél Plant 27, 509–522 (1977).Dogimont, C. et al. Identification of QTLs contributing to resistance to different strains of Cucumber mosaic cucumovirus in melon. Acta Hortic 510, 391–398 (2000).Essafi, A. et al. Dissection of the oligogenic resistance to Cucumber mosaic virus in the melon accession PI 161375. Theoretical and Applied Genetics 118, 275–284 (2009).Guiu-Aragonés, C., Díaz-Pendón, J. A. & Martín-Hernández, A. M. Four sequence positions of the movement protein of Cucumber mosaic virus determine the virulence against cmv1-mediated resistance in melon. Molecular Plant Pathology 16, 675–684, doi: 10.1111/mpp.12225 (2015).Guiu-Aragonés, C. et al. The complex resistance to Cucumber mosaic cucumovirus (CMV) in the melon accession PI 161375 is governed by one gene and at least two quantitative trait loci. Molecular Breeding 34, 351–362, doi: 10.1007/s11032-014-0038-y (2014).Guiu-Aragonés, C. et al. cmv1 is a gate for Cucumber mosaic virus transport from bundle sheath cells to phloem in melon. Mol. Plant Pathology 17, 973–984 (2016).Sanseverino, W. et al. Transposon Insertions, Structural Variations, and SNPs Contribute to the Evolution of the Melon Genome. Molecular Biology and Evolution 32, 2760–2774, doi: 10.1093/molbev/msv152 (2015).Pols, M. S., ten Brink, C., Gosavi, P., Oorschot, V. & Klumperman, J. The HOPS Proteins hVps41 and hVps39 Are Required for Homotypic and Heterotypic Late Endosome Fusion. Traffic 14, 219–232, doi: 10.1111/tra.12027 (2013).Asensio, C. S. et al. Self-assembly of VPS41 promotes sorting required for biogenesis of the regulated secretory pathway. Developmental cell 27, 425–437, doi: 10.1016/j.devcel.2013.10.007 (2013).Kolesnikova, L. et al. Vacuolar protein sorting pathway contributes to the release of Marburg virus. Journal of Virology8 3, 2327–2337, doi: 10.1128/JVI.02184-08 (2009).Nuñez-Palenius, H. G. et al. Melon Fruits: Genetic Diversity, Physiology, and Biotechnology Features. Critical Reviews in Biotechnology 28, 13–55, doi: 10.1080/07388550801891111 (2008).Castelblanque, L. et al. Improving the genetic transformation efficiency of Cucumis melo subsp. melo “Piel de Sapo” via Agrobacterium. Procedings of the IXth UECARPIA Meeting on Genetics and Breeding of Cucurbitaceae, 21-24th May, Avignon,, 627–631 (2008).Dahmani-Mardas, F. et al. Engineering melon plants with improved fruit shelf life using the TILLING approach. PLoS ONE 5, doi: 10.1371/journal.pone.0015776 (2010).Esteras, C. et al. SNP genotyping in melons: genetic variation, population structure, and linkage disequilibrium. Theoretical and Applied Genetics 126, 1285–1303, doi: 10.1007/s00122-013-2053-5 (2013).Leida, C. et al. Variability of candidate genes, genetic structure and association with sugar accumulation and climacteric behavior in a broad germplasm collection of melon (Cucumis melo L.). BMC Genetics 16, 28, doi: 10.1186/s12863-015-0183-2 (2015).Balderhaar, H. Jk & Ungermann, C. CORVET and HOPS tethering complexes – coordinators of endosome and lysosome fusion. Journal of Cell Science 126, 1307–1316, doi: 10.1242/jcs.107805 (2013).Darsow, T., Katzmann, D. J., Cowles, C. R. & Emr, S. D. Vps41p Function in the Alkaline Phosphatase Pathway Requires Homo-oligomerization and Interaction with AP-3 through Two Distinct Domains. Molecular Biology of the Cell 12, 37–51 (2001).Ostrowicz, C. W. et al. Defined subunit arrangement and Rab interactions are required for functionality of the HOPS tethering complex. Traffic 11, 1334–1346, doi: 10.1111/j.1600-0854.2010.01097.x (2010).Solinger, J. A. & Spang, A. Tethering complexes in the endocytic pathway: CORVET and HOPS. FEBS Journal 280, 2743–2757, doi: 10.1111/febs.12151 (2013).Rehling, P., Dawson, T., Katzmann, D. J. & Emr, S. D. Formation of AP-3 transport intermediates requires Vps41 function. Nature Cell Biology 1, 346–353 (1999).Niihama, M., Takemoto, N., Hashiguchi, Y., Tasaka, M. & Morita, M. T. ZIP genes encode proteininvolved inmembrane trafficking of the TGN–PVC/Vacuoles. Plant and Cell Physiology 50, 2057–2068, doi: 10.1093/pcp/pcp137 (2009).Wang, A. & Krishnaswamy, S. Eukaryotic translation initiation factor 4E-mediated recessive resistance to plant viruses and its utility in crop improvement. Molecular Plant Pathology 13, 795–803, doi: 10.1111/j.1364-3703.2012.00791.x (2012).Ruffel, S. et al. A natural recessive resistance gene against potato virus Y in pepper corresponds to the eukaryotic initiation factor 4E (eIF4E). The Plant Journal 32, 1067–1075, doi: 10.1046/j.1365-313X.2002.01499.x (2002).Morosky, S., Lennemann, N. J. & Coyne, C. B. BPIFB6 regulatessecretory pathway trafficking and Enterovirus replication. Journal of Virology 90, 5098–5107, doi: 10.1128/jvi.00170-16 (2016).Serra-Soriano, M., Pallás, V. & Navarro, J. A. A model for transport of a viral membrane protein through the early secretory pathway: minimal sequence and endoplasmic reticulum lateral mobility requirements. The Plant Journal 77, 863–879, doi: 10.1111/tpj.12435 (2014).Vale-Costa, S. & Amorim, M. J. Recycling Endosomes and Viral Infection. Viruses 8, 64, doi: 10.3390/v8030064 (2016).Carette, J. E. et al. Ebola virus entry requires the cholesterol transporter Niemann-Pick C1. Nature 477, 340–343, doi: 10.1038/nature10348 (2011).Barajas, D., Martín, I. Fd. C., Pogany, J., Risco, C. & Nagy, P. D. Noncanonical role for the host Vps4 AAA + ATPase ESCRT protein in the formation of Tomato bushy stunt virus replicase. PLoS Pathog 10, e1004087, doi: 10.1371/journal.ppat.1004087 (2014).Richardson, L. G. L. et al. A unique N-Tterminal sequence in the Carnation Italian ringspot virus p36 replicase-associated protein interacts with the host cell ESCRT-I component Vps23. Journal of Virology 88, 6329–6344, doi: 10.1128/JVI.03840-13 (2014).Jiang, J., Patarroyo, C., Garcia Cabanillas, D., Zheng, H. & Laliberté, J.-F. The vesicle-forming 6K2 protein of Turnip mosaic virus interacts with the COPII coatomer Sec. 24a for viral systemic infection. Journal of Virology 89, 6695–6710, doi: 10.1128/jvi.00503-15 (2015).Genovés, A., Navarro, J. A. & Pallás, V. Theintra- and intercellular movement of Melon necrotic spot virus (MNSV) depends on an active secretory pathway. Molecular Plant-Microbe Interactions 23, 263–272, doi: 10.1094/MPMI-23-3-0263 (2010).Amano, M. et al. High-resolution mapping of zym, a recessive gene for Zucchini yellow mosaic virus resistance in cucumber. Theoretical and Applied Genetics 126, 2983–2993, doi: 10.1007/s00122-013-2187-5 (2013).Lewis, J. D. & Lazarowitz, S. G. Arabidopsis synaptotagmin SYTA regulates endocytosis and virus movement protein cell-to-cell transport. Proceedings of the National Academy of Sciences of the United States of America 107, 2491–2496, doi: 10.1073/pnas.0909080107 (2010).Rizzo, T. & Palukaitis, P. Construction of full-length cDNA clones of Cucumber mosaic virus RNAs 1, 2 and 3: Generation of infectious RNA transcripts. Molecular and General Genetics 122, 249–256 (1990).Zhang, L., Handa, K. & Palukaitis, P. Mapping local and systemic symptom determinants of Cucumber mosaic cucumovirus in tobacco. The Journal of General Virology 75, 3185–3191 (1994).Fukino, N., Sakata, Y., Kunihisa, M. & S., M. Characterisation of novel simple sequence repeat (SSR) markers for melon (Cucumis melo L.) and their use for genotype identification. Journal of Horticultural Science & Biotechnology 82, 330–334 (2007).Garcia-Mas, J. et al. The genome of melon (Cucumis melo L.). Proceedings of the National Academy of Sciences 109, 11872–11877, doi: 10.1073/pnas.1205415109 (2012).Untergasser, A. et al. Primer3—new capabilities and interfaces. Nucleic Acids Research 40, e115–e115, doi: 10.1093/nar/gks596 (2012).Gonzalo, M. J. et al. Simple-sequence repeat markers used in merging linkage maps of melon (Cucumis melo L.). Theor Appl Genet 110, 802–811 (2005).Doyle, J. J. & Doyle, J. L. Isolation of plant DNA from fresh tissue. Focus1 2, 13–15 (1990).Argyris, J. M. et al. Use of targeted SNP selection for an improved anchoring of the melon (Cucumis melo L.) scaffold genome assembly. BMC Genomics 16, 4, doi: 10.1186/s12864-014-1196-3 (2015).Proost, S. et al. PLAZA 3.0: an access point for plant comparative genomics. Nucleic Acids Research 43, D974–D981, doi: 10.1093/nar/gku986 (2015).Choi, Y., Sims, G. E., Murphy, S., Miller, J. R. & Chan, A. P. Predicting the Functional Effect of Amino Acid Substitutions and Indels. PLoS ONE 7, e46688, doi: 10.1371/journal.pone.0046688 (2012).Li, B. et al. Automated inference of molecular mechanisms of disease from amino acid substitutions. Bioinformatics 25, 2744–2750, doi: 10.1093/bioinformatics/btp528 (2009).Earley, K. W. et al. Gateway-compatible vectors for plant functional genomics and proteomics. The Plant Journal 45, 616–629, doi: 10.1111/j.1365-313X.2005.02617.x (2006).Gonzalez-Ibeas, D. et al. MELOGEN: an EST database for melon functional genomics. BMC Genomics 8, 306 (2007).Pfaffl, M. W. A new mathematical model for relative quantification in real-time RT–PCR. Nucleic Acids Research 29, 2002–2007 (2001).Dalmais, M. et al. UTILLdb, a Pisum sativum in silico forward and reverse genetics tool. Genome Biology 9, R43–R43, doi: 10.1186/gb-2008-9-2-r43 (2008).Saladié, M. et al. Comparative transcriptional profiling analysis of developing melon (Cucumis melo L.) fruit from climacteric and non-climacteric varieties. BMC Genomics 16, 440, doi: 10.1186/s12864-015-1649-3 (2015)

Stiff monatomic gold wires with a spinning zigzag geometry

Using first principles density functional calculations, gold monatomic wires are found to exhibit a zigzag shape which remains under tension, becoming linear just before breaking. At room temperature they are found to spin, what explains the extremely long apparent interatomic distances shown by electron microscopy.The zigzag structure is stable if the tension is relieved, the wire holding its chainlike shape even as a free-standing cluster. This unexpected metallic-wire stiffness stems from the transverse quantization in the wire, as shown in a simple free electron model.Comment: 4 pages, latex, 5 figures, submitted to PR

NLO BFKL Equation, Running Coupling and Renormalization Scales

I examine the solution of the BFKL equation with NLO corrections relevant for deep inelastic scattering. Particular emphasis is placed on the part played by the running of the coupling. It is shown that the solution factorizes into a part describing the evolution in Q^2, and a constant part describing the input distribution. The latter is infrared dominated, being described by a coupling which grows as x decreases, and thus being contaminated by infrared renormalons. Hence, for this part we agree with previous assertions that predictive power breaks down for small enough x at any Q^2. However, the former is ultraviolet dominated, being described by a coupling which falls like 1/(\ln(Q^2/\Lambda^2) + A(\bar\alpha_s(Q^2)\ln(1/x))^1/2)with decreasing x, and thus is perturbatively calculable at all x. Therefore, although the BFKL equation is unable to predict the input for a structure function for small x, it is able to predict its evolution in Q^2, as we would expect from the factorization theory. The evolution at small x has no true powerlike behaviour due to the fall of the coupling, but does have significant differences from that predicted from a standard NLO in alpha_s treatment. Application of the resummed splitting functions with the appropriate coupling constant to an analysis of data, i.e. a global fit, is very successful.Comment: Tex file, including a modification of Harvmac, 46 pages, 8 figures as .ps files. Correction of typos, updating of references, very minor corrections to text and fig.