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Manuscript Preparation

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Language and spelling All articles are in English. Spelling corresponds to the Merriam-Webster’s Collegiate Dictionary. Foreign words and phrases that occur in the body of the dictionary should not be italicized.

Format Manuscripts should be double spaced with wide margins. All pages must be numbered, bear the senior author’s name, and be formatted to standard US letter size (21.5 × 27.9 cm; 8.5 × 11 inches).

Title page Page one should be reserved for the title of the paper, the name(s) and address(es) of the author(s), the telephone number, fax number and e-mail address of the corresponding author, a running head of up to 50 characters and spaces, and any necessary footnotes.

Summary Page two should be reserved for a concise summary and an alphabetical list of keywords or phrases, excluding those in the title, to be used in compiling the volume index.

Materials and methods The description of experimental procedures should be sufficient to allow repetition of the work. Details should be omitted where reference can be made to published procedures. However, except in the case of standard procedures, methods should be outlined even when reference is made to a published description. Procedures published in sources that will not be readily available to most readers of Archaea should be described in full.

References Articles cited in the text will be referred to by the name(s) of the author(s) with the year of publication in parenthesis. If both are in parenthesis, no punctuation separates the name(s) of the authors(s) and the year of publication. Consecutive citations in the text are placed in chronological order and separated by commas. If there are more than two authors, only the senior author’s name is given, and this is followed by the phrase et al., which should be in roman, not italic, type.

Beginning on a separate sheet, references should be listed alphabetically at the end of the article thus:

Varndell, I.M. and J.M. Polak. 1987. EM immunolabeling. In Electron Microscopy in Molecular Biology: A Practical Approach. Eds. J. Sommerville and U. Scheer. IRL Press, Washington, pp 179–200.

Vreeland, R.H. and L.I. Hochstein. 1992. The biology of halophilic bacteria. CRC Press, Boca Raton, 336 p.

Woese, C.R., O. Kandler and M.L. Wheelis. 1990. Toward a natural system of organisms: Proposal for the domains Archaea, Bacteria, and Eucarya. Proc. Natl. Acad. Sci. 87:4576–4579.

Biological Abstracts should be used as a guide to the abbreviation of journal titles. Personal communications, unpublished data, or papers in preparation or submitted for publication should not be listed as references, but incorporated in the text.

Tables Tables should be numbered with Arabic numerals and have an explanatory title. Each table, with title, should be on a separate sheet. Tables will be printed in portrait orientation only.

Figures All illustrative material must be of publication quality. Figures cannot be redrawn by the Publisher except at the author’s expense.

When reproduced at final size, lettering on figures should be 1.5 to 2.5 mm in height (capitals and numerals). A sans-serif font (e.g., Arial, Helvetica, Zurich) is preferred, and lettering must be of the same style for all figures in a paper. Figures should be designed to fit one (8.23 cm), one and a half (11.5–12.5 cm), or two (17.16 cm) column widths, with a maximum height of 23.4 cm. For the best reproduction, figures should be submitted at the size they are to appear in the journal. Multipart figures should be assembled on a single A4 or 21.5 × 27.9 cm (8.5 × 11 inches) page.

Use only solid or open symbols, and avoid the use of light lines or fine-screen shading. Distinguish areas within a diagram with solid white or black fill, hatching, or cross-hatching.

Units and abbreviations Systéme Internationale (SI) units of measure and their abbreviations should normally be used, although certain non-SI units are also acceptable including liter (l), minute (min), day, week and year, the last three of which should be spelled out in full.

Whole numbers less than 10 are spelled out unless followed by a unit of measure. Otherwise, numbers are represented by numerals provided that they do not occur as the first word in a sentence.