- Volume 128, Issue 9, 1982
Volume 128, Issue 9, 1982
- Biochemistry
-
-
-
Polyuronide Biosynthesis by Cell-free Extracts of Mucor rouxii
More LessCell-free extracts from Mucor rouxii contain enzymes that catalyse the synthesis of uridine diphosphate glucuronic acid (UDPGlcA) from UDPglucose and the incorporation of glucuronic acid from UDPGlcA into polymer(s). Two different polyuronide fractions isolated from the cell walls of this fungus were used as primers. Mucoran, a heteropolymer, was much more efficient than mucoric acid, which is largely a homopolymer of d-glucuronic acid. The primer ability of native cell walls was comparable to that of mucoric acid. Most of the glucuronosyltransferase activity in the cell-free extract was found in a 20000 g particulate fraction. Optimum pH for polyuronide synthesis was 7·0. Mn2+ or Mg2+ stimulated incorporation of GlcA. The products synthesized from mucoric acid and mucoran primers were different and yielded different disaccharides upon hydrolysis.
-
-
-
-
Purification and Partial Characterization of a Developmentally Regulated 1,3-β-Glucanase from Penicillium italicum
More Less1,3-β-Glucanase I is one of the three 1,3-β-glucanase enzymes which are developmentally regulated in Penicillium italicum. On incubation of the fungus in derepressing medium (limited in glucose), 1,3-β-glucanases II and III are produced first, followed by 1,3-β-glucanase I. We have purified the latter enzyme 290-fold from cell-free extracts of derepressed mycelium. The purification involved Sephadex G-100 chromatography, adsorption to DEAE-Sephadex, concanavalin A-Sepharose and preparative isoelectric focusing. The purified enzyme appeared homogeneous on SDS-PAGE. The apparent molecular weights estimated by Sephadex G-100 filtration and SDS-PAGE were 65000 and 68000 respectively. The enzyme appears to be an acidic glycoprotein (pI 4·7) with an endo-splitting mode of action, clearly different from 1,3-β-glucanases II and III. The K m on a standard, slightly branched 1,3-β-glucan (laminarin) was 0·04 mg ml-1, at least ten times lower than the average Km for β-glucanases. It showed almost no activity on heavily branched substrates (yeast wall glucan). An evaluation of the physicochemical properties and other characteristics suggests a metabolic role for this endo-1,3-β-glucanase.
-
-
-
Initial Reactions in the Oxidation of Anthracene by Cunninghamella elegans
More LessCunninghamella elegans oxidized anthracene predominantly to trans-1,2-dihydroxy-1,2-dihydroanthracene and 1-anthryl sulphate. In addition, several unidentified metabolites were produced. The major compounds formed were isolated by TLC and HPLC, and identified by their UV-visible absorption and mass spectra. Experiments with [9-14C]anthracene indicated that the total amount of anthracene metabolized increased from 2·0% at 2 h to 26·9% at 48 h. The ratio of organic-soluble to water-soluble metabolites at 2 h was 85:15 while at 48 h it was 43:57. The results demonstrate that C. elegans has the ability to oxidize anthracene in a manner similar to that observed in mammals.
-
-
-
Biochemical Comparison of Pili from Variants of Neisseria gonorrhoeae P9
More LessFour different types of pili produced by variants of Neisseria gonorrhoeae P9 were isolated and characterized. The pili differed in subunit molecular weight with SDS-PAGE and in subunit isoelectric point on agarose gels. Isoelectric points of the major molecular species in Tritonagarose gels of octylglucoside solubilized pili were: δ, pI 6·5; α;, pI 6·0; β, pI 5·3 and γ, pI 5·5. Amino acid analyses of pili showed close homology between different types but a reduction in the content of aspartate and serine was notable in the low molecular weight δ pili; also β and γ pili contained more alanine residues. Structural homology was also demonstrated in peptide maps of tryptic/chymotryptic digests of pili with several major peptides apparently common to all four pilus types.
-
-
-
Purification and Biosynthesis of a Spore Coat Protein in Bacillus megaterium QM B1551
More LessA spore coat protein of Bacillus megaterium QM B1551 was purified from an SDS-DTT extract of lysozyme-digested spores using Sephadex, DEAE-cellulose chromatography and polyacrylamide disc gel electrophoresis. The molecular weight of the protein was approximately 12000. It constituted about 13% of spore dry weight and was rich in lysine, aspartic acid, glycine and alanine residues. The sum of these four amino acids constituted 53.9% of the total amino acids. Small amounts of phosphorus and sugar were detected, but no amino sugar. The protein was synthesized in the cytosol of sporulating mother cells at t 3, and accumulated on the forespores.
-
- Development And Structure
-
-
-
Yeast Flocculation: Influence of Nutritional Factors on Cell Wall Composition
More LessThe walls of two strains of Saccharomyces uvarum (flocculent and non-flocculent) were isolated from exponential and stationary phase cells after growth in media of different Ca2+ and K+ composition. Flocculation of the walls was identical to that of intact cells. The transition from the non-flocculent to the flocculent state involved alterations of the polysaccharide, protein and mineral (Ca2+ and K+) composition of the walls. The walls of flocculent cells had a higher mannose/glucose molar ratio, a lower percentage of protein, a lower percentage of Ca2+ and a higher percentage of K+.
-
-
- Ecology
-
-
-
Methods for the Direct Isolation and Enumeration of Actinophages in Soil
More LessExisting direct isolation methods may seriously underestimate the actual numbers of actinophages in soil, since major ‘losses’ may be incurred during agitation, filter sterilization and, to a lesser extent, centrifugation. Two methods were devised for the isolation and enumeration of soil actinophages and were compared experimentally with two previously described methods. Numbers of up to 2 × 104 p.f.u. (g soil)−1 were detected in compost soil.
-
-
- Genetics And Molecular Biology
-
-
-
Genes for l-Sorbose Utilization in Escherichia coli
More LessAmongst forty wild strains of Escherichia coli, nine used l-sorbose as a source of carbon and energy and two mutated to use it. Laboratory strains K12, B and C were l-sorbose-negative. Genes for l-sorbose utilization (sor +) were transferred to K12 from six wild strains; genes conferring the mutable phenotype were also transferred. All were cotransducible with metA at 90 min on the linkage map. The most probable gene order was met ace sor pgi mal. Complementation tests identified two genes for l-sorbose utilization. Genetical evidence showed that the catabolite repressor protein of K12 exerted positive control over sor + genes introduced into K12. The genes for phosphofructokinase (pfkA), the phosphocarrier protein (ptsH) and phosphotransferase enzyme I (ptsI) were required for utilization of l-sorbose.
The frequency of transduction of sor + was low when selection was made for sor +, because l-sorbose partially inhibited the growth of both l-sorbose-negative strains and K12 (sor +) strains. Uridine, thymidine and sorbitol each annulled the inhibition of growth and increased the frequency of transduction of sor +.
-
-
-
-
Regulation of Hut Enzymes and Extracellular Protease Activities in Vibrio alginolyticus hut Mutants
More LessThe production of alkaline protease, collagenase and histidine utilization (Hut) enzymes by Vibrio alginolyticus wild-type, hutH1 and hutU1 strains was investigated. Alkaline protease synthesis was stimulated by histidine and urocanic acid in the wild-type and hutU1 strains. In the hutHl mutant alkaline protease production was stimulated by urocanic acid and not by histidine. The Hut enzymes in the wild-type strain were coordinately induced by histidine. Urocanase and forimino-hydrolase were induced by histidine in the hutH1 mutant which lacked histidase and was not able to convert histidine to urocanic acid. Collagenase production in peptone medium was inhibited in the hut mutants. It is concluded that in V. alginolyticus urocanic acid regulates alkaline protease synthesis but that the Hut enzymes are induced by histidine. The involvement of the Hut genetic system in the regulation of alkaline protease and collagenase synthesis is discussed.
-
-
-
Plasmids in the Genus Bifidobacterium
More LessA total of 1461 bacterial isolates, representing 24 different species of the genus Bifidobacterium, were examined for the presence of plasmid DNA. Approximately 20% of the isolates contained detectable plasmids, but only four species were represented: B. longum, the predominant bifid species in the human intestine; B. globosum, the most common in animals; and B. asteroides and B. indicum, species found exclusively in the intestines of western and asiatic honey bees, respectively. Multiple plasmids were common among isolates of B. longum and B. asteroides, while all plasmid-bearing isolates of B. globosum and 60% of B. indicum isolates contained only one plasmid each. Certain multiple plasmid profiles were predominant among the B. longum and B. asteroides isolates.
-
-
-
Abnormalities in Cell Division Induced by Diepoxybutane in rad1-1 and rad3 Mutants of Saccharomyces cerevisiae
More LessSaccharomyces cerevisiae mutants rad1-1 and rad3 differ from the wild-type and from other UV-sensitive rad mutants in their behaviour after transfer from medium containing 1,2:3,4-diepoxybutane (DEB) to DEB-free medium. In both mutants several post-treatment cell cycles proceed in the absence of cell wall separation, resulting in the formation of multicellular chains or aggregates. In this study, electron and light microscopy revealed that at least one post-treatment budding cycle is accompanied by nuclear division while subsequent cell cycles can proceed in the absence of regular nuclear cycles. At low percentage survival levels, the first post-treatment budding cycle was not delayed and was accompanied by significant incorporation of radioactivity into DNA and protein. In contrast, subsequent cell cycles were found to be accompanied by only protein synthesis and not DNA synthesis. The wild-type strain, unlike the mutants, responded to DEB treatment by a dose-dependent lag in the onset of macromolecular synthesis and cell proliferation, and after prolonged incubation in mutagen-free medium the culture consisted of single budded and unbudded cells.
-
-
-
Relation of Plasmid DNA to Indoleacetic Acid Production in Different Strains of Pseudomonas syringae pv. savastanoi
More LessPseudomonas syringae pv. savastanoi is a bacterial pathogen of olive, oleander and privet, on which it induces tumorous overgrowths called knots or galls. Production of indoleacetic acid (IAA), a necessary factor for gall induction, is coded in oleander strain EW2009 by a 52 kb plasmid called pIAA1. To determine if this trait were commonly plasmid-borne in other strains of this pathogen, Iaa- mutants were isolated from twelve different strains by selection for α-methyltryptophan resistance. Each mutant was compared in its plasmid pattern with the parent wild-type. In oleander strains PB205 and PB213 loss of IAA production was associated with loss of, or large deletions in, a 73 kb plasmid called pIAA2. In the remaining strains from olive and privet loss of IAA production was not accompanied by the loss of any plasmid. To prove that pIAA2 coded for the genes for IAA production, a radioactive probe containing the first gene of the IAA pathway (iaaM) was hybridized to the plasmid DNA of the twelve strains. Only pIAA2 showed homology. We concluded that of all strains studied only PB205 and PB213 harboured a plasmid coding for IAA production, while in the remaining strains the IAA genes were located on the chromosome.
-
-
-
Changes in the Pattern of Protein Synthesis During the First Three Hours of Sporculation in Bacillus subtilis
More LessCultures were labelled with l-[35S]methionine for 5 min periods immediately after resuspension in sporulation medium (t 0) or at hourly intervals thereafter (t 1, t 2 or t 3). Cells were harvested and lysed very rapidly at low temperature in the presence of inhibitors of protease, cell extracts were subjected to high-resolution two-dimensional gel electrophoresis, and radioactive proteins were revealed by fluorography. Comparisons of fluorograms from wild-type cells labelled at various times after resuspension showed that 35 proteins were synthesized at t 1 that were not seen at t 0, ten at t 2 that were not seen at t 1, and seven at t 3 that were not seen at t 2. Conversely, nine proteins ceased to be synthesized in the first hour of resuspension, eight in the second hour and five in the third hour. Experiments with the same protocol were done with cells of a strain carrying spo-43, a mutation that blocks sporulation at a very early stage. The results show that the mutation prevents about two-thirds of the total number of changes that occur in the wild-type in the first hour, about one-third of those that occur in the second hour, but only two out of 12 of those that occur in the third hour.
-
- Pathogenicity And Medical Microbiology
-
-
-
Two Mannose-resistant Haemagglutinins on Enterotoxigenic Escherichia coli of Serotype O6:K15:H16 or H Isolated from ‘Travellers’ and Infantile Diarrhoea
More LessEnterotoxigenic Escherichia coli of serotype O6:K15:H16 or H have been shown to cause MRHA of bovine erythrocytes (MRHAbov), a characteristic associated with possession of so-called CFA (CFA/II) which facilitates adhesion to the intestinal mucosa. Using putative anti-CFA/II antisera, raised to whole cell vaccines of MRHA+ bov prototype strains of different biotypes with subsequent absorption with their MRHA- bov variants, three immunologically distinct CS antigens were identified on enterotoxigenic strains of this serotype. CS1 antigen was found only on MRHA+ bov isolates of biotype A (rhamnose-negative). Specific anti-CS1 antigen serum agglutinated rhamnose-negative strains, gave a single immunoprecipitate in double immunodiffusion against cell surface extracts of these bacteria, and only inhibited the MRHAbov activity of biotype A strains. The presence of CS1 serologically correlated with the presence of a 16·3 kDal polypeptide band upon SDS-PAGE of extracts. CS2 antigen was identified on MRHA+ bov strains of biotypes B, C and F (rhamnose-positive). Specific anti-CS2 antigen serum agglutinated only the latter strains, gave a single immunoprecipitate against cell surface extracts of only rhamnose fermenting strains, and only inhibited MRHAbov activity of strains of these biotypes. The presence of CS2 antigen serologically was associated with the presence of a 15.3 kDal polypeptide band in SDS-PAGE patterns of extracts. The CS3 antigen was identified by immunodiffusion tests with extracts of most O6:K15:H16 or H strains possessing CS1 or CS2 antigen, i.e. independently of biotype, and was associated with the presence of a 14·8 kDal polypeptide band by SDS-PAGE. Anti-CS3 antigen antibodies did not agglutinate nor did they possess haemagglutination inhibition activity. CS3 antigen was also found on an enterotoxigenic isolate series of serotype O8:K40:H9, which was MRHA- bov, and lacked the CS1 and CS2 antigens. A number of CS2-only O-serogroup 6 strains were identified. Expression of MRHAbov activity and the production of CS1, CS2 and CS3 antigens were phenotypically suppressed by growth at 18°C. Loss of ST and also, in most instances, of LT production accompanied loss of MRHAbov activity and loss of production of the CS1, CS2 and CS3 antigens. Thus, the findings demonstrate the presence of two serologically distinct, biotype-associated haemagglutinins with different molecular weight properties on MRHA+ bov enterotoxigenic E. coli of serotype O6:K15:H16 or H of human origin and of a third non-haemagglutinating surface-associated antigen common to most strains which may also facilitate adhesion.
-
-
-
-
Adhesive Properties Associated with the Vir Plasmid: A Transmissible Pathogenic Characteristic Associated with Strains of Invasive Escherichia coli
More LessEscherichia coli strain S5 (O15 : K+:H21) isolated from a septicaemic lamb and previously shown to possess a virulence plasmid, Vir, attached in vitro to calf epithelial tissue from the ileum, oesophagus and trachea in the presence of 0·5% (w/v) d-mannose. The Vir+ recombinant strains 711 v and H209av, which had received the Vir plasmid(s) from strain S5, also attached to these epithelia but the parent strains 711 and H209a without the Vir plasmid were non-adhesive. The attachment of the Vir+ strain 711 v to intestinal brush borders was inhibited by antiserum to live Vir+ strain H209av but not by antiserum to strain H209a lacking Vir. No adherence occurred with Vir+ organisms grown at 18 °C or after heating at 65 °C. Adhesion was unaffected by 0·5 % (w/v) formaldehyde. Glucosamine, mannosamine, their N-acetyl derivatives and wheat germ lectin each inhibited attachment of Vir+ strain 711v to brush border epithelia.
-
-
-
Common Antigens of Streptococcal and Non-streptococcal Oral Bacteria: Isolation and Biochemical Characterization of the Extracellular Protein Antigen
More LessAn extracellular soluble common protein (ECP) has been purified from extracellular soluble fractions of exponential phase cultures of Streptococcus sanguis OMZ9, of a representative strain of each of Bratthall's seven serological groups of Streptococcus mutans, and of one strain each of Lactobacillus salivarius and Actinomyces viscosus. The ECP antigens from the different strains were prepared from SDS-dissociated immunoprecipitates by affinity chromatography on an anti-rabbit immunoglobulin column. The identity of such purified ECP antigens was demonstrated by their behaviour in immunodiffusion analysis, in SDS–PAGE, in which an identical molecular weight (60000) was found, and by virtue of their similar amino acid and sugar compositions. This common antigen (ECP) consisted of 90% protein and 10% sugar.
-
- Physiology And Growth
-
-
-
Enterotoxin Production, DNA Repair and Alkaline Phosphatase of Vibrio cholerae Before and After Animal Passage
More LessThree strains of Vibrio cholerae differing in biotype, serotype and/or toxinogenicity were studied. The capability for dark repair of DNA and stability of alkaline phosphatase decreased concomitantly with toxinogenicity on laboratory passage of highly enterotoxinogenic strain 569B. These properties could be restored by passaging strain 569B once through a guinea-pig.
-
-
-
-
Conjugation in Chemostat Cultures of Schizosaccharomyces pombe
More LessIn chemostat cultures, Schizosaccharomyces pombe (NCYC 132 and derivative strains) formed conjugants in glucose-limited but not in ammonia-limited synthetic medium. Conjugation occurred at a low growth rate (doubling time, t d approx. 11 h), low aeration rate (0.1 fermenter vol. air min−1) and 32C, but not at an increased growth rate (t d approx. 4·5 h) or at lower temperatures (20–25 °C). Conjugation of S. pombe 968h90 in chemostat culture was greater under glucose-limitation than ammonia-limitation. Batch cultures of S. pombe 968h90 in synthetic medium produced conjugants when the glucose supply was limited, but when glucose was in excess the amount of nitrogen influenced the degree of conjugation. Conjugation of strain 968h90 was inhibited in batch cultures in synthetic medium under conditions such that a large quantity of glucose was metabolized, and in cultures grown in synthetic medium containing added ethanol (0·5%). Inhibition of conjugation also occurred in batch cultures of S. pombe NCYC 132 and 968h90 in malt extract broth containing added ethanol.
-
-
-
Transient Repression of Erythromycin Formation in Streptomyces erythraeus
More LessThe effect of d-glucose on growth and erythromycin production by Streptomyces erythraeus was investigated. d-Glucose stimulated growth and caused a strong but temporary suppression of antibiotic formation. Maximum specific suppression of erythromycin formation occurred at a carbohydrate concentration of 20 mg ml−1. A non-metabolizable analogue of glucose, 2-deoxy-d-glucose, also suppressed antibiotic formation. Since glucose caused a decrease in erythromycin formation only when added before the stage of antibiotic production, we conclude that this sugar exerted a transient repressive effect on erythromycin biosynthesis.
-
-
-
Effect of Carbon Source and pH on the Production and Secretion of Acid Phosphatase (EC 3.1.3.2) and Alkaline Phosphatase (EC 3.1.3.1) in Neurospora crassa
More LessGrowth conditions (carbon source and pH of the medium) affected the level and distribution of derepressed acid and alkaline phosphatases in Neurospora crassa. Regardless of the pH, the production of both acid and alkaline phosphatases was stimulated by sucrose. Irrespective of the carbon source used, at pH values higher than 7·4 the secretion of alkaline phosphatase was stimulated, while the production and secretion of acid phosphatase was restricted. The converse was true at pH values lower than 5·7. The secretion of one of these enzymes did not exclude the simultaneous secretion of the other at pH values of around 7·0. These results suggest that the pH of the medium may play an important role in the survival of the organism in phosphorus-limited environments.
-
Volumes and issues
-
Volume 170 (2024)
-
Volume 169 (2023)
-
Volume 168 (2022)
-
Volume 167 (2021)
-
Volume 166 (2020)
-
Volume 165 (2019)
-
Volume 164 (2018)
-
Volume 163 (2017)
-
Volume 162 (2016)
-
Volume 161 (2015)
-
Volume 160 (2014)
-
Volume 159 (2013)
-
Volume 158 (2012)
-
Volume 157 (2011)
-
Volume 156 (2010)
-
Volume 155 (2009)
-
Volume 154 (2008)
-
Volume 153 (2007)
-
Volume 152 (2006)
-
Volume 151 (2005)
-
Volume 150 (2004)
-
Volume 149 (2003)
-
Volume 148 (2002)
-
Volume 147 (2001)
-
Volume 146 (2000)
-
Volume 145 (1999)
-
Volume 144 (1998)
-
Volume 143 (1997)
-
Volume 142 (1996)
-
Volume 141 (1995)
-
Volume 140 (1994)
-
Volume 139 (1993)
-
Volume 138 (1992)
-
Volume 137 (1991)
-
Volume 136 (1990)
-
Volume 135 (1989)
-
Volume 134 (1988)
-
Volume 133 (1987)
-
Volume 132 (1986)
-
Volume 131 (1985)
-
Volume 130 (1984)
-
Volume 129 (1983)
-
Volume 128 (1982)
-
Volume 127 (1981)
-
Volume 126 (1981)
-
Volume 125 (1981)
-
Volume 124 (1981)
-
Volume 123 (1981)
-
Volume 122 (1981)
-
Volume 121 (1980)
-
Volume 120 (1980)
-
Volume 119 (1980)
-
Volume 118 (1980)
-
Volume 117 (1980)
-
Volume 116 (1980)
-
Volume 115 (1979)
-
Volume 114 (1979)
-
Volume 113 (1979)
-
Volume 112 (1979)
-
Volume 111 (1979)
-
Volume 110 (1979)
-
Volume 109 (1978)
-
Volume 108 (1978)
-
Volume 107 (1978)
-
Volume 106 (1978)
-
Volume 105 (1978)
-
Volume 104 (1978)
-
Volume 103 (1977)
-
Volume 102 (1977)
-
Volume 101 (1977)
-
Volume 100 (1977)
-
Volume 99 (1977)
-
Volume 98 (1977)
-
Volume 97 (1976)
-
Volume 96 (1976)
-
Volume 95 (1976)
-
Volume 94 (1976)
-
Volume 93 (1976)
-
Volume 92 (1976)
-
Volume 91 (1975)
-
Volume 90 (1975)
-
Volume 89 (1975)
-
Volume 88 (1975)
-
Volume 87 (1975)
-
Volume 86 (1975)
-
Volume 85 (1974)
-
Volume 84 (1974)
-
Volume 83 (1974)
-
Volume 82 (1974)
-
Volume 81 (1974)
-
Volume 80 (1974)
-
Volume 79 (1973)
-
Volume 78 (1973)
-
Volume 77 (1973)
-
Volume 76 (1973)
-
Volume 75 (1973)
-
Volume 74 (1973)
-
Volume 73 (1972)
-
Volume 72 (1972)
-
Volume 71 (1972)
-
Volume 70 (1972)
-
Volume 69 (1971)
-
Volume 68 (1971)
-
Volume 67 (1971)
-
Volume 66 (1971)
-
Volume 65 (1971)
-
Volume 64 (1970)
-
Volume 63 (1970)
-
Volume 62 (1970)
-
Volume 61 (1970)
-
Volume 60 (1970)
-
Volume 59 (1969)
-
Volume 58 (1969)
-
Volume 57 (1969)
-
Volume 56 (1969)
-
Volume 55 (1969)
-
Volume 54 (1968)
-
Volume 53 (1968)
-
Volume 52 (1968)
-
Volume 51 (1968)
-
Volume 50 (1968)
-
Volume 49 (1967)
-
Volume 48 (1967)
-
Volume 47 (1967)
-
Volume 46 (1967)
-
Volume 45 (1966)
-
Volume 44 (1966)
-
Volume 43 (1966)
-
Volume 42 (1966)
-
Volume 41 (1965)
-
Volume 40 (1965)
-
Volume 39 (1965)
-
Volume 38 (1965)
-
Volume 37 (1964)
-
Volume 36 (1964)
-
Volume 35 (1964)
-
Volume 34 (1964)
-
Volume 33 (1963)
-
Volume 32 (1963)
-
Volume 31 (1963)
-
Volume 30 (1963)
-
Volume 29 (1962)
-
Volume 28 (1962)
-
Volume 27 (1962)
-
Volume 26 (1961)
-
Volume 25 (1961)
-
Volume 24 (1961)
-
Volume 23 (1960)
-
Volume 22 (1960)
-
Volume 21 (1959)
-
Volume 20 (1959)
-
Volume 19 (1958)
-
Volume 18 (1958)
-
Volume 17 (1957)
-
Volume 16 (1957)
-
Volume 15 (1956)
-
Volume 14 (1956)
-
Volume 13 (1955)
-
Volume 12 (1955)
-
Volume 11 (1954)
-
Volume 10 (1954)
-
Volume 9 (1953)
-
Volume 8 (1953)
-
Volume 7 (1952)
-
Volume 6 (1952)
-
Volume 5 (1951)
-
Volume 4 (1950)
-
Volume 3 (1949)
-
Volume 2 (1948)
-
Volume 1 (1947)