JOURNAL OF BACTERIOLOGY

VOLUME 141 0 NUMBER 2 * 1981 EDITORIAL BOARD Simon Silver, Editor-in-Chief (1982) Washington University, St. Louis, Mo. Stanley C. Holt, Editor (1982) Elizabeth McFall, Editor (1985) Robert Rownd, Editor (1985) University ofMassachusetts, Amherst New York University, New York, N. Y. Northwestern Medical School Samuel Kaplan, Editor (1983) Donald P. Nierlich, Editor (1982) Chicago, Ill. University of Illinois, Urbana University of Cal!fornia, Paul S. Sypherd, Editor ( 1984) June J. Lascelles, Editor (1984) Allen T. Phillips, Editor (1985) University of California, Irvine University of California, Los Angeles Pennsylvania State University, University Park Mark Achtman (1982) Ann Ganesan (1982) John H. Nordin (1982) James Akagi (1982) J. F. Gardner (1981) Sunil Palchaudhuri (1982) David Apirion (1982) Robert Gennis (1982) Leo Parks (1982) Arthur 1. Aronson (1982) Bijan K. Ghosh (1981) Martin Pato (1981) Gad Avigad (1983) David T. Gibson (1981) Olga Pierucci (1981) Stephen D. Barbour (1982) Harry E. Gilleland, Jr. (1982) Patrick J. Piggot (1981) Manfred E. Bayer (1982) Patricia L. Grilione (1982) William S. Reznikoff (1982) Claire M. Berg (1983) Walter R. Guild (1981) Palmer Rogers (1981) Robert W. Bernlohr (1982) Tadayo Hashimoto (1982) Burton Rosan (1981) Terry J. Beveridge (1982) Gerald L. Hazelbauer (1981) Barry P. Rosen (1983) Dale C. Birdsell (1981) Charles E. Helmstetter (1982) Harry Rosenberg (1982) Edwin Boatman (1983) Ulf Henning (1982) Antoinette Ryter (1982) Winfried Boos (1982) Peter Hirsch (1982) Abigail Salyers (1981) H. D. Braymer (1982) Bruce Holloway (1982) Gene A. Scarborough (1982) Jean Brenchley (1983) Philip Hylemon (1982) June Scott (1981) Patrick J. Brennan (1981) Karin Ihler (1981) Jane K. Setlow (1981) Robert P. Burchard (1982) Joseph Inselburg (1981) Peter Setlow (1981) 1. D. J. Burdett (1982) Robert J. Kadner (1982) J. A. Shapiro (1982) Richard 0. Burns (1983) Eva R. Kashket (1981) Lucille Shapiro (1983) Ercole Canale-Parola (1982) Donald L. Keister (1983) Douglas W. Smith (1983) A. M. Chakrabarty (1983) Edward Kellenberger (1982) Issar Smith (1981) Murray S. Cohn (1982) David E. Kennell (1983) Paul F. Smith (1982) John W. Costerton (1983) Jordan Konisky (1981) Dieter G. Soll (1982) Anthony R. Crofts (1982) K. W. Knox (1982) A. L. Sonenshein (1983) John E. Cronan, Jr. (1983) Thomas G. Lessie (1982) Brian G. Spratt (1982) Lolita Daneo-Moore (1981) Donald R. Luekling (1981) Eric J. Stanbridge (1981) Daniel V. Der Vartanian (1982) Ben J. J. Lugtenberg (1983) Roger Storck (1981) Walter J. Dobrogosz (1982) Carolyn MacGregor (1981) Stanley Streicher (1983) W. D. Donachie (1982) Manley Mandel (1981) 1. W. Sutherland (1982) W. Ford Doolittle (1982) Barry Marrs (1981) John L. Swanson (1981) J. Allan Downie (1982) Ann Matthysse (1982) Robert L. Switzer (1982) Gerhart Drews (1982) Neil H. Mendelson (1981) F. Robert Tabita (1981) Charles Earhart (1981) Sally Ann Meyer (1981) Kenneth N. Tinunis (1981) A. Eisenstark (1982) Robert V. Miller (1981) Alexander Tomasz (1983) David P. Fan (1981) David Mount (1982) James L. Van Etten (1982) Walton L. Fangman (1981) R. G. E. Murray (1983) James A. Wechsler (1981) John D. Foulds (1982) Walter G. Niehaus, Jr. (1981) Henry C. Wu (1981) Hiroshi Nikaido (1981) Howard Zalkin (1982) Gisella Pollock, Acting Managing Editor Linda M. Illig, Production Editor 1913 I St., NW, Washington, DC 20006 EX OFFICIO Albert Balows, President (1980-1981) Frederick C. Neidhardt, President-Elect (1980-1981) J. Mehsen Joseph, Secretary Brinton M. Miller, Treasurer

The Journal of Bacteriology, (ISSN 0021-9193), a publication Second class postage paid at Washington, DC 20006, and at of the American Society for Microbiology, 1913 1 St.. NW. additional mailing offices. Washington, DC 20006. is devoted to the advancement and Made in the United States of America. dissemination of fundamental knowledge concerning bacteria Copyright i 1981, American Society for Microbiology. and other microorganisms. Instructions to Authors are published All Rights Reserved. in the January issue each year; reprints are available from the Editors and the Publications Office. The Journal is published monthly. and the twelve numbers are divided into four volumes The code at the top of the first page of an article in this journal per year. The nonmember subscription price is $140 per year. indicates the copyright owner's consent that copies of the article Single copies are S14. The member subscription price is $30 per may be made for personal use, or for personal use of specific year. Correspondence relating to subscriptions, reprints, defective clients. This consent is given on the condition, however, that the copies. availability of back issues, lost or late proofs. disposition copier pay the stated per-copy fee through the Copyright Clear- of submitted manuscripts, and general editorial matters should ance Center, Inc.. P.O. Box 765. Schenectady. New York 12301. be directed to the ASM Publications Office. 1913 1 St., NW. for copying beyond that permitted by Sections 107 and 108 of Washington. DC 20006 (area 202 833-9680). the U.S. Copyright Law. This consent does not extend to other 1 kinds of copying, such as copying for general distribution, for a *: A Mf -$ iX5itA,J' E .tf*1I CI:I; 1t. advertising or promotional purposes, for creating new collective works, or for resale. Author Index

Achtman, Mark, 840 Harada, Tokuya, 796 Mutoh, Norihiro, 1085 Adachi, Osao, 814 Harkness, Robin E., 845 Albritton, William L., 1099 Harris, Charles L., 1031 Nagasawa, Tadako, 1085 Ameyama, Minoru, 814 Heckels, John E., 736 Nakayama, Tatsuo, 953 Andrews, Robert E., Jr., 1052 Hill, John E., 696 Neuhard, Jan, 687 Arai, Takao, 803 Horodniceanu, Thea, 1102 Nohara, Chieko, 808 Horwitz, Arnold H., 873 Nordin, Philip, 1052 Barbour, Stephen D., 914 Hotani, Hirokazu, 1082 Norlander, Lena, 788 Baron, L. S., 1010 Hulett, F. Marion, 926, 934 Normark, Staffan, 788 Bazzicalupo, M., 1079 Humphreys, G. 0., 780 Nunn, William D., 1110 Bendler, John W., 1099 Berg, Claire M., 984 Inoue, Masakazu, 729 O'Day, Kathy, 904 Beutin, Lothar, 840 Irikura, Maki, 953 Ordal, George W., 958 Bieth, Gilda, 1102 Ishiguro, Edward E., 845 Bougueleret, Lydie, 1102 Ishihara, Akira, 1082 Boye, Erik, 1091 Park, James V., 704 Bradley, Doug, 704 Parker, Charlotte D., 1018 Brill, Winston J., 743, 1116 Jaffor Ullah, Abul H., 958 Peck, H. D., Jr., 966 Brown, Moira G. M., 780 Janczura, E., 775 Pemberton, J. M., 681 Bulla, Lee A., Jr., 1052 Jensen, Roy A., 752 Pepino, R., 1079 Burris, Robert H., 824 Johnson, E. M., 1010 Perkins, H. R., 780 Byng, Graham S., 752 Peters, Wendy, 904 Kaguni, Jon M., 974 Pienkos, Philip T., 743 Kaguni, Laurie Simon, 974 Pilacinski, W. P., 1025 Callister, Heather, 1042 Kahn, Marc E., 1075 Polsinelli, M., 1079 Chen, Chai-Pao, 926 Projan, Steven J., 861 Cocito, C., 775 Kane, James F., 768 Collins, Hugh H., 1010 Katze, Jon R., 768 Kelley, Jenny T., 1018 Raugei, G., 1079 KeUn, Rod A., 1095 Ray, Dan S., 974 Davidson, Loren I., 1052 Komeda, Yoshibumi, 1036 Reusch, R. N., 889 Davies, John K., 788 Kopecko, Dennis J., 1010 Dean, Donald H., 980 Kramer, Karl J., 1052 Deshpande, Kathryn L., 768 Kupersztoch-Portnoy, Yankel Sadoff, H. L., 889 Don, R. H., 681 M., 722 Saier, Milton H., Jr., 1106 Dougan, Gordon, 920 Kurogi, Yumiko, 953 Saunders, J. R., 780 Doyle, Ronald J., 878 Schaus, Nancy, 904 Duncan, Bruce K., 687 Schmidt, E. L., 1025, 1063 Dunn-Coleman, Nigel S., 884 Laszo1, Daniel J., 990 Shaw, Karen J., 984 Leonard, John E., 1106 Shinagawa, Emiko, 814 Leyh-Bouille, M., 775 Shipley, Patricia L., 920 Falkow, Stanley, 920 Liu, Chi-Li, 966 Shizuya, Hiroaki, 1113 Federici, G., 1079 Lohr, John R., 980 Snellings, Norma J., 1010 Foster, John W., 1002 Lysko, Paul G., 946 Soil, Larry, 704 Fouts, Ken E., 914 Spencer, Donald B., 926, 934 Freese, Ernst, 760 Macrina, Francis L., 867 Steen, Harald B., 1091 Fujita, Yasutaro, 760 Stelow, Jane K., 1099 Fukunaga, Yukiko, 808 Magee, Paul T., 896 Maloy, Stanley R., 1110 Stieglitz, Heather, 722 Manning, Paul A., 840 Streips, Uldis N., 878 Gallon, E., 1079 Martin, Phyllis A. W., 980 Suzuki, Takahito, 1036 Garrett, Charles, 687 Martin, Ronald R., 713 Sweet, William J., 824 Garrett, Reginald H., 884 Martine-Cadena, Maria Gherna, Robert L., 752 Guadalupe, 722 Takehara, Tadamichi, 729 Ghuysen, J. M., 775 Matsushita, Kazunobu, 814 Tanaka, Michiyasu, 808 Gromkova, Rosa, 1075 Michel, Georges, 675 Taylor, Barry L., 990 Guinand, Micheline, 675 Mirelman, David, 845 Taylor, Kent D., 1113 Guzman-Verduzco, Luz Maria, Mizushima, Shoji, 1085 te Riele, Hein P. J., 832 722 Morioka, Toshio, 729 Thorlton, Cydney L., 713 Morse, Stephen A., 946 Timko, Jozef, 873 Hagblom, Per, 788 Murooka, Yoshikatsu, 796 Tsien, H. C., 1063 Tyrell, Dana J., 1052 Warner, Huber R., 687 Yamagishi, Saburo, 808 Wechsler, James A., 861 Yamaguchi, Shigeru, 1082 Welch, Rodney A., 867 Yamamoto, Tatsuo, 850 Unger, Leon, 713 Yamamoto, Tomoko, 808 Weston, A., 780 Yokogawa, Kanae, 729 Vacheron, Marie-Jeanne, 675 Whelan, William L., 896 Yokota, Takeshi, 850 van Sluis, Paul, 832 Whitaker, Robert J., 752 Venema, Gerard, 832 White, Terry B., 878 Wilcox, Gary, 873 Zak, Victor L., 1095 Wake, R. G., 1042 Willetts, Neil, 840 Zelinka, Jan, 873 Wannamaker, Lewis W., 696 Wright, Andrew, 904 Zhu, Jiabi, 1116