The LiteratureSearch command searches the scientific literature, returning results within Maple.  

The parameter searchterms is a string or list of strings where each string contains a term to be included in the literature search.  For example, searching for "electron transport" returns articles that contain the exact phrase "electron transport" in any of the searchable fields, i.e. title, author, and abstract.  By contrast, searching for ["electron","transport"] discovers articles that have "electron" and "transport" separately but not necessarily together in one of the fields.  

LiteratureSearch returns text containing the total number of articles found, the page number, and the article data for each of the page's entries.  The article data includes: title, author, abstract, journal, first publication date, and URL.  The number of entries per page is controlled by the keyword pagesize whose default value is 10.  Upon re-executing LiteratureSearch without changing its input parameters, the command will return the next page.  To return to the first page, the user can set the optional boolean keyword resetpage to true.  The output can also be duplicated in a file by using the keyword filename to set the path and filename.  

The command can search two databases: EuropePMC (default) and arXiv.  The searched database can be changed by setting the keyword database to "EuropePMC" or "arXiv" respectively.  The EuropePMC database contains more than 40 million science articles and preprints including the complete PubMed and PubMed Central collections.  The arXiv database includes physics preprints from quantum physics to chemical physics and biophysics.

The keyword source is a string or list of strings that allows the user to specify the search field for each term in searchterms.  The allowed sources are: "ti","au","abs","jr","id", and "all".  The "ti", "au", "abs", and "jr" represent title, author, abstract, and journal fields.  The "id" is the doi (for EuropePMC) or arXiv id (for arXiv).  The "all" (default) indicates that all available fields will be searched.  The source list must match the length of the list in searchterms.  

 The keyword sortby is a string indicating whether the articles should be sorted by relevance, date, or number of citations.  For EuropePMC the options are: "relevance" (default), "date", and "cited".  For arXiv the options are "date" (default), "relevance", "lastUpdatedDate", and "submittedDate" where "date" is equivalent to "lastUpdatedDate".  

The keyword sortorder is a string indicating whether the entries are sorted in descending or ascending order with respect to the criterion set by the keyword sortby.  The keyword options are: "descending" (default) or "ascending".

database = string -- a string that selects the database "EuropePMC" (default) or "arXiv".

filename = string -- a string that optionally sets the filename to which the search's output to the screen is duplicated; if relevant, the path should be included as part of the filename.  The default is no output to a file.

pagesize = posint -- a positive integer that sets the number of entries returned per page.  Default is 10.

prettyprint = truefalse -- when true (default for Worksheet/Document), the output is prettyprinted with the print command; when false (default for Command Line), the output is line printed in a terminal font.

resetpage = true/false -- setting to true resets the output to the first page.  Default is false.

sortby = string -- a string indicating whether the articles should be sorted by relevance, date, or number of citations.  For EuropePMC the options are: "relevance" (default), "date", and "cited".  For arXiv the options are "date" (default), "relevance", "lastUpdatedDate", and "submittedDate" where "date" is equivalent to "lastUpdatedDate".  

sortorder = string -- a string indicating whether the entries are sorted in descending or ascending order with respect to the criterion set by the keyword sortby.  The keyword options are: "descending" (default) or "ascending".

source = string or list of strings --a string or list of strings that allows the user to specify the search field for each term in searchterms.  The allowed sources are: "ti","au","abs","jr","id", and "all".  The "ti", "au", "abs", and "jr" represent title, author, abstract, and journal fields.  The "id" is the doi (for EuropePMC) or arXiv id (for arXiv).  The "all" (default) indicates that all available fields will be searched.  The source list must match the length of the list in searchterms.

$\mathrm{with}\left(\mathrm{QuantumChemistry}\right)\:$

$\mathrm{LiteratureSearch}\left(\left[''RNA''\,''methylation''\right]\, \mathrm{pagesize}\=2\right)\;$

$''Total\; Number\; of\; Articles\; Available\; =\; 171858''$

$''Page\; =\; 1''$

$''Title:\; RNA\; N6-methyladenosine\; methylation\; and\; skin\; diseases.''$

$''Author:\; Yu\; Y,\; Lu\; S,\; Jin\; H,\; Zhu\; H,\; Wei\; X,\; Zhou\; T,\; Zhao\; M.''$

$''Abstract:\; Skin\; diseases\; are\; global\; health\; issues\; caused\; by\; multiple\; pathogenic\; factors,\; in\; which\; epigenetics\; plays\; an\; invaluable\; role.\; Post-transcriptional\; RNA\; modifications\; are\; important\; epigenetic\; mechanism\; that\; regulate\; gene\; expression\; at\; the\; genome-wide\; level.\; N6-methyladenosine\; (m6A)\; is\; the\; most\; prevalent\; modification\; that\; occurs\; in\; the\; messenger\; RNAs\; (mRNA)\; of\; most\; eukaryotes,\; which\; is\; installed\; by\; methyltransferases\; called\; "writers",\; removed\; by\; demethylases\; called\; "erasers",\; and\; recognised\; by\; RNA-binding\; proteins\; called\; "readers".\; To\; date,\; m6A\; is\; emerging\; to\; play\; essential\; part\; in\; both\; physiological\; processes\; and\; pathological\; progression,\; including\; skin\; diseases.\; However,\; a\; systematic\; summary\; of\; m6A\; in\; skin\; disease\; has\; not\; yet\; been\; reported.\; This\; review\; starts\; by\; illustrating\; each\; m6A-related\; modifier\; specifically\; and\; their\; roles\; in\; RNA\; processing,\; and\; then\; focus\; on\; the\; existing\; research\; advances\; of\; m6A\; in\; immune\; homeostasis\; and\; skin\; diseases.''$

$''Journal:\; Autoimmunity\; 56,\; 2167983\; (2023)''$

$''First\; Publication\; Date:\; 2023-12-01''$

$''URL:\; https://doi.org/10.1080/08916934.2023.2167983''$

$''Title:\; The\; chromatin\; signatures\; of\; enhancers\; and\; their\; dynamic\; regulation.''$

$''Author:\; Barral\; A,\; DÃ\copyright jardin\; J.''$

$''Abstract:\; Enhancers\; arecis-regulatory\; elements\; that\; can\; stimulate\; gene\; expression\; from\; distance,\; and\; drive\; precise\; spatiotemporal\; gene\; expression\; profiles\; during\; development.\; Functional\; enhancers\; display\; specific\; features\; including\; an\; open\; chromatin\; conformation,\; Histone\; H3\; lysine\; 27\; acetylation,\; Histone\; H3\; lysine\; 4\; mono-methylation\; enrichment,\; and\; enhancer\; RNAs\; production.\; These\; features\; are\; modified\; upon\; developmental\; cues\; which\; impacts\; their\; activity.\; In\; this\; review,\; we\; describe\; the\; current\; state\; of\; knowledge\; about\; enhancer\; functions\; and\; the\; diverse\; chromatin\; signatures\; found\; on\; enhancers.\; We\; also\; discuss\; the\; dynamic\; changes\; of\; enhancer\; chromatin\; signatures,\; and\; their\; impact\; on\; lineage\; specific\; gene\; expression\; profiles,\; during\; development\; or\; cellular\; differentiation.''$

$''Journal:\; Nucleus\; 14,\; 2160551\; (2023)''$

$''First\; Publication\; Date:\; 2023-12-01''$

$''URL:\; https://doi.org/10.1080/19491034.2022.2160551''$

$\mathrm{LiteratureSearch}\left(\left[''quantum\; tunneling''\,''molecules''\right]\, \mathrm{pagesize}\=2\, \mathrm{database}\=''arXiv''\right)\;$

$''Total\; Number\; of\; Articles\; Available\; =\; 117''$

$''Page\; =\; 2''$

$''Title:\; Radical\; Addition\; and\; H\; Abstraction\; Reactions\; in\; C2H2,\; C2H4\; and\; C2H6:\; A\; Gateway\; for\; Ethyl\; and\; Vinyl\; Bearing\; Molecules\; in\; the\; Interstellar\; Medium''$

$''Author:\; German\; Molpeceres\; and\; Victor\; M.\; Rivilla''$

$Summary: Recent interstellar detections include a significant number of moleculescontaining vinyl (C2H3) and ethyl (C2H5) groups in their structure. For severalof these molecules, there is not a clear experimental or theoretical evidencethat support their formation from simpler precursors. We carried out asystematic search of viable reactions starting from closed shell hydrocarbonscontaining two carbon atoms (ethane, C2H6; ethylene, C2H4; and acetylene, C2H2)with the goal of determining viable chemical routes for the formation of vinyland ethyl molecules on top of interstellar dust grains. Our results show thatboth H and OH radicals are key in converting acetylene and ethylene into morecomplex radicals that are susceptible to continue reacting and forminginterstellar complex organic molecules. The relevant reactions, for example OHadditions, present rate constants above 10$^{1}$ s$^{-1}$ that are likelycompetitive with OH diffusion on grains. Similarly, H atom addition toacetylene and ethylene is a very fast process with rate constants above10$^{4}$ s$^{-1}$ in all cases, and greatly enhanced by quantum tunneling.Hydrogen abstraction reactions are less relevant, but may play a role inspecific cases involving the OH radical. Reactions with other radicals NH2, CH3are likely to have a much lesser impact in the chemistry of ethyl and vinylbearing molecules.$

$''ID:\; http://arxiv.org/abs/2206.00350v1''$

$''Published\; arXiv:\; 2022-06-01T09:34:15Z''$

$''Updated\; arXiv:\; 2022-06-01T09:34:15Z''$

$''Title:\; Quantum\; tunnelling\; driven\; H\$\_2\$\; formation\; on\; graphene''$

$''Author:\; Erxun\; Han,\; Wei\; Fang,\; Michail\; Stamatakis,\; Jeremy\; O.\; Richardson,\; and\; Ji\; Chen''$

$Summary: It is commonly believed that it is unfavourable for adsorbed H atoms oncarbonaceous surfaces to form H$_2$ without the help of incident H atoms. Usingring-polymer instanton theory to describe multidimensional tunnelling effects,combined with ab initio electronic structure calculations, we find that thesequantum-mechanical simulations reveal a qualitatively different picture.Recombination of adsorbed H atoms, which was believed to be irrelevant at lowtemperature due to high barriers, is enabled by deep tunnelling, with reactionrates enhanced by tens of orders of magnitude. Furthermore, we identify a newpath for H recombination that proceeds via multidimensional tunnelling, butwould have been predicted to be unfeasible by a simple one-dimensionaldescription of the reaction. The results suggest that hydrogen moleculeformation at low temperatures are rather fast processes that should not beignored in experimental settings and natural environments with graphene,graphite and other planar carbon segments.$

$''ID:\; http://arxiv.org/abs/2204.00808v1''$

$''Published\; arXiv:\; 2022-04-02T08:30:39Z''$

$''Updated\; arXiv:\; 2022-04-02T08:30:39Z''$