Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine or thermogene travertine . Tufa is sometimes referred to as meteogene travertine .
19-497: Modern and fossil tufa deposits abound with wetland plants; as such, many tufa deposits are characterised by their large macrobiological component, and are highly porous. Tufa forms either in fluvial channels or in lacustrine environments. Ford and Pedley (1996) provide a review of tufa systems worldwide. Deposits can be classified by their depositional environment (or otherwise by vegetation or petrographically ). Pedley (1990) provides an extensive classification system, which includes
38-578: A form of travertine . It is generally thought that such features form from CaCO 3 precipitated when carbonate rich source waters emerge into alkaline soda lakes. They have also been found in marine settings in the Ikka fjord of Greenland where the Ikaite columns can reach up to 18 m (59 ft) in height. Tufa deposits form an important habitat for a diverse flora. Bryophytes (mosses, liverworts etc.) and diatoms are well represented. The porosity of
57-522: A form of calcareous sinter. They lack any significant macrophyte component due to the absence of light, and for this reason they are often morphologically closer to travertine or calcareous sinter. Tufa columns are an unusual form of tufa typically associated with saline lakes . They are distinct from most tufa deposits in that they lack any significant macrophyte component, due to the salinity excluding mesophilic organisms . Some tufa columns may actually form from hot-springs, and may therefore constitute
76-403: A function is defined in lowercase, it can be called in uppercase, but if a variable is defined in lowercase, it cannot be referred to in uppercase. Nim is case-insensitive and ignores underscores, as long as the first characters match. A text search operation could be case-sensitive or case-insensitive, depending on the system, application, or context. The user can in many cases specify whether
95-414: A reduction in p CO 2 , for example increased air-water interactions at waterfalls may be important, as may photosynthesis. Recently it has been demonstrated that microbially induced precipitation may be more important than physico-chemical precipitation. Pedley et al. (2009) showed with flume experiments that precipitation does not occur unless a biofilm is present, despite supersaturation. Calcite
114-475: A search is sensitive to case, e.g. in most text editors, word processors, and Web browsers. A case-insensitive search is more comprehensive, finding "Language" (at the beginning of a sentence), "language", and "LANGUAGE" (in a title in capitals); a case-sensitive search will find the computer language "BASIC" but exclude most of the many unwanted instances of the word. For example, the Google Search engine
133-407: A source code tree for software for Unix-like systems might have both a file named Makefile and a file named makefile in the same directory. In addition, some Mac Installers assume case insensitivity and fail on case-sensitive file systems. The older MS-DOS filesystems FAT12 and FAT16 were case-insensitive and not case-preserving, so that a file whose name is entered as readme.txt or ReadMe.txt
152-583: Is basically case-insensitive, with no option for case-sensitive search. In Oracle SQL, most operations and searches are case-sensitive by default, while in most other DBMSes , SQL searches are case-insensitive by default. Case-insensitive operations are sometimes said to fold case , from the idea of folding the character code table so that upper- and lowercase letters coincide. In filesystems in Unix-like systems, filenames are usually case-sensitive (there can be separate readme.txt and Readme.txt files in
171-464: Is occasionally shaped into a planter. Its porous consistency makes it ideal for alpine gardens . A concrete mixture called hypertufa is used for similar purposes. In the 4th century BC, tufa was used to build Roman walls up to 10m high and 3.5m thick. The soft stone allows for easy sculpting. Tufa masonry was used in cemeteries, such as the one in Cerveteri . macrobiology From Misplaced Pages,
190-613: Is saved as README.TXT. Later, with VFAT in Windows 95 the FAT file systems became case-preserving as an extension of supporting long filenames . Later Windows file systems such as NTFS are internally case-sensitive, and a readme.txt and a Readme.txt can coexist in the same directory. However, for practical purposes filenames behave as case-insensitive as far as users and most software are concerned. This can cause problems for developers or software coming from Unix-like environments, similar to
209-569: Is the dominant mineral precipitate, followed by the polymorph aragonite . Tufa is common in many parts of the world including: Some sources suggest that "tufa" was used as the primary building material for most of the châteaux of the Loire Valley , France. This results from a mis-translation of the terms " tuffeau jaune" and "tuffeau blanc", which are porous varieties of the Late Cretaceous marine limestone known as chalk . Tufa
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#1732766280849228-524: The article wizard to submit a draft for review, or request a new article . Search for " Macrobiology " in existing articles. Look for pages within Misplaced Pages that link to this title . Other reasons this message may be displayed: If a page was recently created here, it may not be visible yet because of a delay in updating the database; wait a few minutes or try the purge function . Titles on Misplaced Pages are case sensitive except for
247-406: The deposits creates a wet habitat ideal for these plants. Modern tufa is formed from alkaline waters, supersaturated with calcite. On emergence, waters degas CO 2 due to the lower atmospheric p CO 2 (see partial pressure ), resulting in an increase in pH. Since carbonate solubility decreases with increased pH, precipitation is induced. Supersaturation may be enhanced by factors leading to
266-598: The first character; please check alternative capitalizations and consider adding a redirect here to the correct title. If the page has been deleted, check the deletion log , and see Why was the page I created deleted? Retrieved from " https://en.wikipedia.org/wiki/Macrobiology " Case sensitivity In computers, case sensitivity defines whether uppercase and lowercase letters are treated as distinct ( case-sensitive ) or equivalent ( case-insensitive ). For instance, when users interested in learning about dogs search an e-book , "dog" and "Dog" are of
285-424: The following classes of fluvial tufa: Lacustrine tufas are generally formed at the periphery of lakes and built-up phytoherms (freshwater reefs), and on stromatolites . Oncoids are also common in these environments. Although sometimes regarded as a distinct carbonate deposit, calcareous sinter formed from ambient temperature water can be considered a sub-type of tufa. Calcareous speleothems may be regarded as
304-901: The 💕 Look for Macrobiology on one of Misplaced Pages's sister projects : [REDACTED] Wiktionary (dictionary) [REDACTED] Wikibooks (textbooks) [REDACTED] Wikiquote (quotations) [REDACTED] Wikisource (library) [REDACTED] Wikiversity (learning resources) [REDACTED] Commons (media) [REDACTED] Wikivoyage (travel guide) [REDACTED] Wikinews (news source) [REDACTED] Wikidata (linked database) [REDACTED] Wikispecies (species directory) Misplaced Pages does not have an article with this exact name. Please search for Macrobiology in Misplaced Pages to check for alternative titles or spellings. You need to log in or create an account and be autoconfirmed to create new articles. Alternatively, you can use
323-506: The same directory). MacOS is somewhat unusual in that, by default, it uses HFS+ and APFS in a case-insensitive (so that there cannot be a readme.txt and a Readme.txt in the same directory) but case-preserving mode (so that a file created as readme.txt is shown as readme.txt and a file created as Readme.txt is shown as Readme.txt) by default. This causes some issues for developers and power users , because most file systems in other Unix-like environments are case-sensitive, and, for example,
342-770: The same significance to them. Thus, they request a case-insensitive search. But when they search an online encyclopedia for information about the United Nations , for example, or something with no ambiguity regarding capitalization and ambiguity between two or more terms cut down by capitalization, they may prefer a case-sensitive search. Case sensitivity may differ depending on the situation: Some programming languages are case-sensitive for their identifiers ( C , C++ , Java , C# , Verilog , Ruby , Python and Swift ). Others are case-insensitive (i.e., not case-sensitive), such as ABAP , Ada , most BASICs (an exception being BBC BASIC ), Common Lisp , Fortran , SQL (for
361-511: The syntax, and for some vendor implementations, e.g. Microsoft SQL Server , the data itself) Pascal , Rexx and ooRexx . There are also languages, such as Haskell , Prolog , and Go , in which the capitalisation of an identifier encodes information about its semantics . Some other programming languages have varying case sensitivity; in PHP , for example, variable names are case-sensitive but function names are not case-sensitive. This means that if
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