Molecularphylogenetics IPA en m l kj l r fa l d n t ks pron is the analysis of hereditary molecular .... The result of a molecularphylogenetics phylogenetic analysis is expressed in a phylogenetic tree . Molecularphylogenetics is one aspect of molecular systematics , a broader term that also includes the use of molecular data in taxonomy and biogeography . History of molecularphylogenetics Further History of molecular evolution The theoretical frameworks for molecular systematics were laid in the 1960s ... cite doi 10.1371 journal.pbio.1000602 ref See also Molecular evolution Computational phylogenetics PhyloCode Microbial phylogenetics Phylogenetic nomenclature References MolPhylEvol48 23,48 176,48 ... Systematics and MolecularPhylogenetics http www.ncbi.nlm.nih.gov pmc articles PMC1693355 pdf 15253352.pdf The promise of a DNA taxonomy Mark L. Blaxter phylo Category Phylogenetics Category Molecular ... of molecular phylogenies. Stud. Hist. Phil. Biol. & Biomed. Sci. 39 451 468 ref Applications of molecular ... related organisms have a high degree of agreement in the molecular structure of these substances ... a constant rate of mutation provide a molecular clock for dating divergence. Molecular phylogeny .... Not until recent decades, however, has it been possible to isolate and identify these molecular structures ... alignment techniques to identify similarity. Another application of molecular phylogeny is in DNA barcoding ... at molecular systematics were also termed as chemotaxonomy and made use of proteins, enzyme s, carbohydrate ... chromosome . Typical molecular systematic analyses require the sequencing of around 1000 base pair ... is relatively small. In a molecular systematic analysis, the haplotypes are determined for a defined ... trees. Limitations of molecular systematics Molecular systematics is an essentially Cladistics ... valid taxa must be monophyletic . Molecular phylogenies can be affected by myriad problems, including ..., C. 1996. Molecular systematics . 2nd ed. Sinauer Associates Incorporated. ISBN 0 87893 282 8. Page ... more details
Infobox journal title MolecularPhylogenetics and Evolution cover File MolecularPhylogenetics and Evolution.gif editor D.E. Wildman discipline Phylogeny , evolutionary biology formernames abbreviation Mol. Phylogenet. Evol. publisher Academic Press country United States frequency 12 year history 1992&ndash present openaccess license impact 3.871 impact year 2008 website http www.sciencedirect.com science journal 10557903 link1 link1 name link2 link2 name RSS atom JSTOR OCLC LCCN CODEN ISSN 1055 7903 eISSN MolecularPhylogenetics and Evolution is a peer review ed scientific journal of evolutionary biology and phylogenetics . The journal is edited by D.E. Wildman . Indexing The journal is indexed in EMBiology Journal Citation Reports Scopus Web of Science External links Official website http www.elsevier.com wps find journaldescription.cws home 622921 description description Category Elsevier academic journals Category Evolutionary biology journals Category Phylogenetics Category Molecular biology Category Publications established in 1992 ... more details
Microbial phylogenetics is the study of the evolution ary relatedness among various groups of microorganism s. The molecular approach to microbial Molecularphylogenetics phylogenetic analysis , pioneered by Carl Woese in the 1970s and leading to the three domain model Archaea , Bacteria , Eucaryota , revolutionized our thinking about evolution in the microbial world. Phylogenetic analysis plays a central role in microbiology and the emerging fields of comparative genomics and phylogenomics require ... The purpose of Molecularphylogenetics phylogenetic analysis is to understand the past evolutionary ... taxonomy Computational phylogenetics History of molecular evolution MolecularphylogeneticsPhylogenetics ... OrenA cite book author Oren, A Papke, RT editor year 2010 title Molecular Phylogeny of Microorganisms ... macromolecules nucleic acids, proteins can be used as molecular clocks that contain historical ... in microbiology. Due to the technological innovation of modern molecular biology and the rapid .... There are four steps in general phylogenetic analysis of molecular sequences i selection of a suitable molecule or molecules phylogenetic marker , ii acquisition of molecular sequences, iii multiple ... analysis is to choose a suitable homologous part of the genomes to be compared. Mechanisms of molecular ... in microbial molecular systematics. In this context, MLSA is implemented in a relatively straightforward ... MLSAs in the microbial molecular systematics literature is known to systematists working with plants and animals as the total molecular evidence approach, and has been used to solve difficult ... and fungi, or the phylogeny of major plant lineages. The total molecular evidence approach ... for identifying different groups of microbes in clear molecular terms and for understanding how ... motivation from Charles Darwin s theory of evolution . Until the advent of molecular biology , however ... Microbial phylogenetics Category Phylogenetics ... more details
the more recent field of molecularphylogenetics uses nucleotide sequences encoding genes or amino acid sequences encoding protein s as the basis for classification. Many forms of molecularphylogenetics ... Molecularphylogenetics methods rely on a defined substitution model that encodes a hypothesis about ...Computational phylogenetics is the application of computational algorithm s, methods and programs to Phylogenetics ... Sci 113 3353 3354. ref Traditional phylogenetics relies on morphology biology morphological data obtained ... taxa. In molecular studies, a primary problem is in producing a multiple sequence alignment MSA ... phylogenetics can be either rooted or unrooted depending on the input data and the algorithm ... data on divergence rates, such as the assumption of the molecular clock hypothesis. ref name ... homology Morphological analysis The basic problem in morphological phylogenetics is the assembly of a matrix ... derived tree that was consistent with that produced from molecular data. ref name Strait ... in morphological phylogenetics problems and solutions. Syst Biol 50 5 689 99. ref Because morphological ... Molecular analysis The problem of character coding is very different in molecular analyses, as the characters ... i.e., a molecular clock across lineages. Its relative, UPGMA Unweighted Pair Group Method with Arithmetic ... hard problems first applied to phylogenetics in the early 1980s. ref name hendy Hendy MD, Penny D. 1982 ... regions. As its name implies, it requires as input both a branching rule in the case of phylogenetics ... to phylogenetics. A simple way of defining the bound is a maximum number of assumed evolutionary ... VA, Zharkikh AA, Kolchanov N, Rodin S, Solovyov S, Antonov AS. 1995 . Molecular Evolution Biomathematics ... distribution is a point of contention among users of Bayesian inference phylogenetics methods. ref ... algorithms, although the choice of move set varies selections used in Bayesian phylogenetics include ... a Markov chain Monte Carlo method. Mol Biol Evol 46 409 18. ref The use of Bayesian methods in phylogenetics ... more details
File Heterobranchia tree.png thumb Graph of neighbor joining phylogenetic tree shows a clear split support visualised by long parallel edges for Acochlidiacea in red color . The graph is based on datasets by J rger et al. 2010 ref name J rger 2010 J rger K. M., St ger I., Kano Y., Fukuda H., Knebelsberger T. & Schr dl M. 2010 . On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia . BMC Evolutionary Biology 10 323. doi 10.1186 1471 2148 10 323 . ref and generated by SplitsTree . A split in phylogenetics is a bipartition of a set of taxon taxa , and the smallest unit of information in unrooted phylogenetic tree s each edge of an unrooted phylogenetic tree represents one split, and the tree can be efficiently reconstructed from its set of splits. Moreover, when given several trees, the splits occurring in more than half of these trees give rise to a consensus tree, and the splits occurring in a smaller fraction of the trees generally give rise to a consensus Phylogenetic network Split Network . See also SplitsTree , a program for inferring phylogenetic split networks. References reflist Category Phylogenetics Category Trees data structures ... more details
Orphan date April 2010 Lead too long date February 2010 Phylogenetics of mimicry Mimicry is well understood and heavily studied within specific mimicry groups, individually referred to as mimicry complexes . However the evolutionary and phylogenetic relationships between mimic model or co mimicry pairs are less apparent. The difficulty many researchers face in trying to build phylogenies for mimicry complexes is trying to discriminate between analogous traits, shared characteristics developed through convergent evolution, and homologous traits, shared characteristics that are due to a shared common ancestor. In some instances it is clear whether some traits are analogous or homologous, as in mimicry complexes involving completely unrelated organisms or those of different Order biology orders . In other cases involving similar or same species mimics with different phenotypes , the explanation for trait evolution becomes less clear. To build phylogenies for these groups of mimics, scientists would first need to understand which species is the mimic and which is the model, then afterwards determine how evolution will have proceeded to increase the instances of the shared characteristics. ref Ruxton, G. D., T. N. Sherrat, and M. P. Steed. 2004. Avoiding attack the evolutionary ecology of crypsis, warning signals, & mimicry. Oxford Biology. ref In M llerian mimicry , defended species have evolved similar appearances as a means to share the cost of predator learning M ller, 1862 . The classic example of M llerian mimicry is the Heliconius butterfly. There are 54 species of this unpalatable butterfly with over 700 names applied to its various phenotypes Brower, 1996 . It functions as a perfect M llerian mimic because all species of the Heliconius are inedible and form symbiotic relationships. Extensive research on Heliconius butterflies has even shown not just phenotypic similarities ..., and K. Summers. 2001. Molecular phylogenetic evidence for a mimetic radiation in Peruvian poison ... more details
In phylogenetics , a basal clade is the earliest clade to branch in a larger clade it appears at the base of a cladogram . A basal group forms an Outgroup cladistics outgroup to the rest of the clade, such as in the following example phylogeny Basal group clade Non basal group Non basal group Non basal group Non basal group The word basal is preferred to the term primitive , which may carry false connotations of inferiority or a lack of complexity. The term basal can only be correctly applied to clades of organisms, not to individual traits possessed by the organisms although it can be misused in this manner in technical literature. While the term basal applies to clades, characters or traits are usually considered derived if they are absent in a basal group, but present in other groups. This assumption only holds true if the basal group is a good analogy for the last common ancestor of the group. As an example, the flowering plant family Amborellaceae is considered the most basal Lineage evolution lineage of extant angiosperm s. clade phylogeny Amborellales Clade Monocot s Magnoliid s Eudicot s In animal family Hominidae , the gorillas are an outgroup to chimpanzees, bonobos and humans. These four species form a clade, the subfamily Homininae , of which gorillas are the basal member. clade phylogeny Clade Human s clade Bonobo s Common Chimpanzee Chimpanzee s Gorilla s However, in the family Hominidae, the orangutans form an outgroup to the subfamily Homininae, the clade to which gorillas, chimpanzees, bonobos and humans all belong. clade Orangutan s clade phylogeny Clade Human s clade Bonobo s Common Chimpanzee Chimpanzee s Gorilla s References cite journal title A critical reappraisal of the fossil record of the bilaterian phyla first1 Graham E. last1 Budd first2 S ren last2 Jensen journal Biological Reviews publisher Cambridge University Press volume 75 issue 2 year ... Page publisher Tree of Life web project Category Phylogenetics ca Basal filog nia es Basal eo Baza ... more details
Refimprove date December 2009 Primitive in the sense most relevant to phylogenetics means resembling the first living things and in particular resembling them in the simple nature of their anatomy and behaviour . For example, one might regard a flatworm , which has no legs, wings, or image forming eyes, as more primitive than a beetle, that in its more advanced Morphology biology morphology has all these things. Problems in formulating definitive meanings for the term Depending on context and the discipline under discussion, the term primitive has several meanings, and they are not clearly distinct. Even in the field of Phylogenetics phylogeny it is a difficult concept to deal with unambiguously. Aspects related to ancestry and adaptation In the field of evolution , primitive , when used as a descriptive term, is at its least disputable when applied to ancient species that had not yet undergone selective adaptation that later would cause their descendants to develop functional capabilities of interest in context. For example, prokaryote s such as bacterium bacteria are often described as primitive because they are older in the evolutionary time scale, and are less complex than later organism s such as eukaryote s. On a macroscopic scale , there is no substantial doubt that for example, the most recent common ancestors of the Thysanura silverfish etc. and the Mayfly Ephemeroptera Mayfly mayflies were wingless, and that those wingless ancestors had no winged ancestors in turn. ref cite book last Beklemishev first Vladimir title Principles of Comparative Anatomy of Invertebrates ... phylogenetics basal , and Derived trait derived states, to the likes of primitive and advanced ... consideration. Professionals in fields such as phylogenetics prefer to use terms specific to the discipline .... The terms that cladism cladists prefer are Basal phylogenetics basal its antonym is derived . Reflist DEFAULTSORT Primitive Phylogenetics Category Evolutionary biology no Utviklingsgrad ... more details
download Thomas Keane MOLPHY Molecularphylogenetics protein or nucleotide Maximum likelihood ...This list of phylogenetics software is a compilation of computational phylogenetics software used to produce phylogenetic tree s. Such tools are commonly used in comparative genomics , cladistics , and bioinformatics . Methods for estimating phylogenies include neighbor joining , maximum parsimony also simply referred to as parsimony , UPGMA , Bayesian inference in phylogeny Bayesian phylogenetic inference , maximum likelihood and Distance matrices in phylogeny distance matrix methods . class wikitable Name Description Methods Link Author BAli Phy Simultaneous Bayesian inference of alignment and phylogeny Bayesian inference, alignment as well as tree search. http www.biomath.ucla.edu msuchard bali phy homepage M.A. Suchard, B. D. Redelings BATWING Bayesian Analysis of Trees With Internal Node Generation Bayesian inference, demographic history, population splits http www.mas.ncl.ac.uk nijw download I. J. Wilson, Weale, D.Balding BayesPhylogenies Bayesian inference of trees using Markov Chain Monte Carlo methods Bayesian inference, multiple models, mixture model auto partitioning http www.evolution.rdg.ac.uk BayesPhy.html download M. Pagel, A. Meade BayesTraits Analyses trait evolution among groups of species for which a phylogeny or sample of phylogenies is available Trait analysis ... Analysis Sampling Trees Bayesian inference, relaxed molecular clock, demographic history http beast.bio.ed.ac.uk ... L.S. Vinh, A. von Haeseler LisBeth Three item analysis for phylogenetics and biogeography Three ..., N. Cao & R. Zarag eta Bagils MEGA, Molecular Evolutionary Genetics Analysis MEGA Molecular Evolutionary ... uk.html Institut Pasteur phylogeny webservers http www.expasy.org tools phylo ExPASy List of phylogenetics ... koloko softlinks list of evolutionary genetics software DEFAULTSORT List Of Phylogenetics Software Category Bioinformatics Category Computational phylogenetics Category Lists of software Phylogenetics ... more details
to vary. These attributes can be physical morphological , molecular, genetic, physiological, or behavioral ... phylogenetic analysis, and that more characters are more valuable than more taxa in phylogenetics ... cost and increased automation of molecular sequencing, sample sizes overall are on the rise ... tree, as is the case for comparative phylogenetics , these methods cannot solve the problem. However ... more commonly employed in phylogenetics as elsewhere both methods involve an arbitrary but large ... for phylogenetics, but it is a reasonable estimator of accuracy. Citation needed date August ... in phylogenetics, too, some particular phylogenetic problems for example, long branch attraction ... likely tree. Maximum likelihood, as implemented in phylogenetics, uses a stochastic model that gives ... were not available for non molecular data. New methods, proposed by Paul Lewis, make essentially the same ... Bayesian inference in phylogeny Bayesian phylogenetics uses the likelihood function, and is normally ... J. W. year 2004 title Performance of maximum parsimony and likelihood phylogenetics when evolution is heterogeneous ... Category Phylogenetics Category Computational phylogenetics ca M xima parsim nia de Maximale Sparsamkeit ... more details
for the scientific journal Molecular Ecology Unreferenced date July 2008 Molecular ecology is a field of evolutionary biology that is concerned with applying molecular population genetics , molecularphylogenetics, and more recently genomics to traditional ecology ecological questions e.g., species diagnosis, conservation and assessment of biodiversity, species area relationships, and many questions in behavioral ecology . It is virtually synonymous with the field of Ecological Genetics as pioneered by Theodosius Dobzhansky , E. B. Ford , and others. Citation needed date July 2010 These fields are united in their attempt to study genetic based questions out in the field as opposed to the laboratory. Molecular ecology is related to the field of Conservation genetics . Methods frequently include using Microsatellite genetics microsatellites to determine gene flow and Hybrid biology hybridization between populations. The development of molecular ecology is also closely related to the use of microarray DNA microarrays , which allows for the simultaneous analysis of the expression of thousands of different genes. real time polymerase chain reaction may also be used to analyze gene expression as a result of changes in environmental conditions or different response by differently adapted individuals. Bacterial diversity Molecular ecological techniques have recently been used to study in situ questions of bacterial diversity. This stems from the fact that many microorganisms are not easily obtainable as cultured Strain biology strains in the laboratory, which would allow for identification ... samples using general of group specific Primer molecular biology primers leads to a mix ... for a faster result. See also ecological genetics External links http molecularecology.co.uk Molecular Ecology UK http www.molecol.org WILEY Molecular Ecology Journal DEFAULTSORT Molecular Ecology Category Subfields of ecology Category Molecular biology de Molekulare kologie ja pl Ekologia ... more details
biological classification of organisms. This is called molecular systematics or molecularphylogenetics ... , Journal of Molecular Evolution , and MolecularPhylogenetics and Evolution . Research in molecular ... Molecular clock Col 3 Comparative phylogenetics Neutral theory of molecular evolution Nucleotide ...Evolutionary biology Molecular evolution is in part a process of evolution at the scale of DNA , RNA , and protein s. Molecular evolution emerged as a scientific field in the 1960s as researchers from molecular biology , evolutionary biology and population genetics sought to understand recent discoveries ... as a molecular clock to study species divergence, and the origin of noncoding DNA . Recent advances ... of adaptive molecular evolution versus neutral processes of mutation and drift, and the identification of molecular changes responsible for various human characteristics especially those pertaining to infection , disease , and cognition . Principles of molecular evolution Mutations main Mutation Mutations ... theory of molecular evolution Neutral mutations do not affect the organism s chances of survival in its .... Recurrent mutation can increase the frequency of a mutant allele. Molecular study of phylogeny main Molecular systematics PhylogeneticsMolecular systematics is a product of the traditional field of systematics and molecular genetics . It is the process of using data on the molecular constitution ... . Molecular systematics has been made possible by the availability of techniques for DNA sequencing ... of a defined area of a particular chromosome . Typical molecular systematic analyses require the sequencing of around 1000 base pair s. The driving forces of evolution main Neutral theory of molecular ... to the various forces of evolution, three perspectives provide evolutionary explanations for molecular ... of molecular evolution publisher Sinauer isbn 0 87893 266 6 ref While recognizing the importance ..., J. H year 1991 title The Causes of Molecular Evolution publisher Oxford University Press , New ... more details
Molecular evolution Category Molecular genetics Category Phylogenetics ar bg ...Evolutionary biology The molecular clock based on the molecular clock hypothesis MCH is a technique in molecular evolution that uses fossil constraints and rates of molecular change to deduce the time ... radiation . The molecular data used for such calculations is usually nucleotide DNA sequence ... molecular clock was first attributed to Emile Zuckerkandl and Linus Pauling who, in 1962, noticed that the number ... chapter Molecular disease, evolution, and genetic heterogeneity editor Kasha, M. and Pullman ... of the molecular clock hypothesis in the early 1960s. ref cite journal author Kumar S title Molecular ... April pmid 10079281 ref ref Huang, S. 2008 The genetic equidistance result of molecular evolution ... with neutral theory The observation of a clock like rate of molecular change was originally purely ... last Kimura first Motoo year 1968 title Evolutionary rate at the molecular level journal Nature ... of molecular evolution , which predicted a molecular clock. Let there be N individuals, and to keep ... will become fixed. If most changes seen during molecular evolution are neutral, then Fixation ... of neutral mutation s in an individual. Calibration The molecular clock alone can only say that one time period is twice as long as another it cannot assign concrete dates. To achieve this, the molecular ... 200t title Paleontological evidence to date the Tree of Life journal Molecular Biology & Evolution ... phylogenetics and ancient DNA studies, two areas of evolutionary biology where it is possible to sample ... the molecular clock. Non constant rate of molecular clock Sometimes only a single divergence ... Local molecular clocks in three nuclear genes divergence times for rodents and other mammals, and incompatibility among fossil calibrations journal Journal of Molecular Evolution volume 57 pages S201 ..., E., and Ricklefs, R.E. year 2001 title Molecular systematics and biogeography of Antillean thrashers ... more details
Molecular biology IPAc en icon m l k j l r is the branch of biology that deals with the molecular ... genetics and biochemistry . Molecular biology chiefly concerns itself with understanding ... are regulated. Writing in Nature journal Nature in 1961, William Astbury described molecular ... biology for the corresponding molecular plan. It is concerned particularly with the forms of biological ... month title Molecular Biology or Ultrastructural Biology? journal Nature volume 190 issue 4781 pages ... between biochemistry, genetics and molecular biology.svg thumb 250px Schematic relationship between biochemistry, genetics, and molecular biology Researchers in molecular biology use specific techniques native to molecular biology but increasingly combine these with techniques and ideas from genetics .... Molecular biology is the study of molecular underpinnings of the processes of DNA replication .... The central dogma of molecular biology where genetic material is transcribed into RNA and then translated into protein, despite being an oversimplified picture of molecular biology, still provides ... in light of emerging novel roles for RNA . Much of the work in molecular biology is quantitative, and recently much work has been done at the interface of molecular biology and computer science in bioinformatics ..., molecular genetics , has been among the most prominent sub field of molecular biology. Increasingly ... of molecular biology are used to infer historical attributes of population s or species , as in fields in evolution ary biology such as population genetics and phylogenetics . There is also a long tradition of studying biomolecule s from the ground up in biophysics . Techniques of molecular biology Since the late 1950s and early 1960s, molecular biologists have learned to characterize, isolate, and manipulate the molecular components of cells and organisms. These components include DNA , the repository ... cloning One of the most basic techniques of molecular biology to study protein function is expression ... more details
Infobox Journal title Molecular Cell cover editor discipline Cell biology , molecular biological abbreviation Mol. Cell publisher Cell Press country frequency history 1997 present openaccess license impact impact year website http www.cell.com molecular cell link1 link1 name link2 link2 name RSS http www.cell.com molecular cell rss atom JSTOR OCLC 38065664 LCCN CODEN ISSN 1097 2765 eISSN boxwidth Molecular Cell publishes research articles and review material that focus on analyzes at the molecular level, with an emphasis on new mechanistic insights. Launched in 1997, Molecular Cell publishes 24 issues a year. The impact factor of Molecular Cell in 2009 is 14.608. Category Publications established in 1997 Category Molecular and cellular biology journals biology journal stub fr Molecular Cell ... more details
Context date October 2009 A molecular probe is a group of atoms or molecules attached to other molecules or cellular structures and used in studying the properties of these molecules and structures. Radioactive DNA or RNA sequences are used in molecular genetics to detect the presence of a complementary sequence by molecular Nucleic acid hybridization hybridization . ref cite web url http cancerweb.ncl.ac.uk cgi bin omd?molecular probes title Cancerweb Molecular Probe Definition ref Common Probes Digoxigenin See also Empty section date July 2010 References Reflist 3 External links MeshName Molecular Probes MeshName Molecular Probe Techniques Molecular probes Category Molecular biology Category Biochemistry biochem stub pl Sonda molekularna ... more details
Unreferenced date December 2009 In genetics, a molecular marker identified as genetic marker is a fragment of DNA that is associated with a certain location within the genome . Molecular markers are used in molecular biology and biotechnology to identify a particular sequence of DNA in a pool of unknown DNA. See also Biomarker DEFAULTSORT Molecular Marker Category Chemical compounds Category Authentication methods Science stub ca Marcador molecular fr Marqueur mol culaire it Marcatore molecolare sr ... more details
of X chromosome In humans human X chromosome showing genetic map For short range molecularphylogenetics and molecular clocking, the Y chromosome is highly effective and creates a second perspective ... mtDNA Causes of errors The molecularphylogenetics is based on quantification substitutions and then comparing ... way to assess this variance is to apply molecularphylogenetics on species claimed to be branch points ... doi 10.1093 molbev msl209 url ref Critical Progress Critical in the history of molecular anthropology That molecularphylogenetics could compete with comparative anthropology for determining the proximity ... the same period Loci that have been used in molecularphylogenetics Cytochrome C Serum Albumin Hemoglobin ...Expand section date July 2010 Molecular anthropology is a field of anthropology in which molecular analysis is used to determine evolutionary links between ancient and modern human populations, as well ... populations or within populations . Certain similarities in genetic makeup let molecular anthropologists ... on Humanity . New York McGraw Hill, 2005. ref Molecular anthropology has been extremely useful ... to a better understanding of how humans evolved. Haploid loci in molecular anthropology File Animal ... side at the top, respectively . Mitochondrial DNA became an area of research in phylogenetics in the late ... to promote the idea of a molecular clock . By 1969 molecular clocking was applied to anthropoid evolution ... cite journal author Wilson AC, Sarich VM title A molecular time scale for human evolution ... confronted this conclusion with arguing for improper calibration of molecular clocks. ref name pmid5002096 ... sequence. ref name pmid8533083 cite journal author Ayala FJ title The myth of Eve molecular biology ... of molecular evolution branching from chimp to human to putative LCA, that there was an inequity ... group DNAanthro DNAanthro Molecular Anthropology Tech groups Yahoo a free discussion group DEFAULTSORT Molecular Anthropology Category Genetic genealogy Category Human evolution eo Molekula antropologio ... more details
refimprove date June 2011 The molecular structure of a substance is described by the combination of Atomic nucleus nuclei and electron s that comprise its constitute molecules. This includes the molecular geometry essentially the arrangement, in space, of the equilibrium positions of the constituent atoms in reality, these are in a state of constant vibration, at temperatures above absolute zero , the electronic properties of the bonds, and further molecular properties. The determination of molecular structure uses a multitude of experimental methods, that include X ray diffraction , electron diffraction , many kinds of optical spectroscopy , nuclear magnetic resonance , electron spin resonance , and mass spectrometry . The prediction and explanation of molecular structure uses quantum theory of valency and methods of molecular modeling. The term molecular structure extends to multi molecular complexes. ref Molecular structure entry in AccessScience, the McGraw Hill online Dictionary of Science, http www.accessscience.com popup.aspx?id 63878&name def ref References reflist Category Molecules ... more details
Unreferenced date August 2011 For the medical journal Molecular Oncology journal Molecular oncology is an interdisciplinary medical speciality at the interface of medicinal chemistry and oncology that refers to the investigation of the chemistry of cancer and tumor s at the molecule molecular scale. Chemistry stub Oncology stub Category Medicinal chemistry Category Oncology fa ... more details
Unreferenced date December 2009 A molecular lesion is damage to the structure of a biomolecule biological molecule such as DNA , enzyme s, or protein s that results in reduction or absence of normal function or, in rare cases, the gain of a new function. Lesions in DNA consist of breaks and other changes in the chemical structure of the helix see types of DNA lesions while lesions in proteins consist of both broken bonds and improper protein folding folding of the amino acid chain. DEFAULTSORT Molecular Lesion Category Molecular biology Biochem stub ca Lesi molecular ... more details
Molecular Playground is a project initiated by researchers at University of Massachusetts Amherst whose goal is to expose the molecular aspect of nature to the public by the use of a system which displays interactive molecule simulations in public areas. File Molecular playground.jpg thumb alt Projected display displaying simulation. Molecular Playground displaying how Ritonavir binds to HIV 1 protease External links http molecularplayground.org Official project website US edu stub Category University of Massachusetts Amherst ... more details
Unreferenced date January 2009 A Molecular spacer or simply a spacer in chemistry is any flexible part of a molecule providing a connection between two other parts of a molecule. References reflist Category Molecular geometry chemistry stub ... more details
Image Molecular shuttle illustration commons.png thumbnail 200px An example of a molecular shuttle where the macrocyle green moves between two stations yellow . A molecular shuttle in supramolecular chemistry is a special type of molecular machine capable of Shuttle weaving shuttling molecules or ions from one location to another. This field is of relevance to nanotechnology in its quest for nanoscale electronic components and also to biology where many biochemical functions are based on molecular shuttles. Academic interest also exists for synthetic molecular shuttles, the first prototype reported in 1991 based on a rotaxane ref A molecular shuttle Pier Lucio Anelli, Neil Spencer, and J. Fraser Stoddart J. Am. Chem. Soc. 1991 113 13 pp 5131 5133 DOI 10.1021 ja00013a096 ref . This device is based on a molecular thread composed of a ethyleneglycol chain interrupted by two arene compound arene groups acting as so called stations . The terminal units or stoppers on this wire are bulky triisopropylsilyl groups. The bead is a tetracationic cyclophane based on two bipyridine groups and two phenylene para phenylene groups. The bead is locked to one of the stations by pi pi interaction s but since the activation energy for migration from one station to the other station is only 13 Calorie kcal mole unit mol 54 kilojoule kJ mol the bead shuttles between them. The stoppers prevent the bead from slipping from the thread. Chemical synthesis of this device is based on molecular self assembly from a preformed thread and two bead fragments 32 chemical yield . align center class wikitable Image MolecularShuttleReaction.png 300px molecular shuttle 1991 components Image MolecularShuttleAssembled.png 300px Molecular shuttle molecular shuttle components Molecular shuttle In certain molecular switch es the two stations are non degenerate. References Reflist Category Supramolecular chemistry Category Molecular machines it Navetta molecolare ... more details
Unreferenced date September 2009 Molecular physics is the study of the physical properties of molecule s, the chemical bond s between atom s as well as the molecular dynamics . Its most important experimental techniques are the various types of spectroscopy . The field is closely related to atomic physics and overlaps greatly with theoretical chemistry , physical chemistry and chemical physics . Additionally to the electronic excitation states which are known from atoms, molecules are able to rotate and to vibrate. These rotations and vibrations are quantized, there are discrete energy level s. The smallest energy differences exist between different rotational states, therefore pure rotational Spectrum spectra are in the far infrared region about 30 150 m wavelength of the electromagnetic spectrum . Vibrational spectra are in the near infrared about 1 5 m and spectra resulting from electronic transitions are mostly in the visible and ultraviolet regions. From measuring rotational and vibrational spectra properties of molecules like the distance between the nuclei can be calculated. One important aspect of molecular physics is that the essential atomic orbital theory in the field of atomic physics expands to the molecular orbital theory. See also portal Physics Born Oppenheimer Approximation Molecular energy state Molecular modelling Molecular modeling Rigid rotor Spectroscopy DEFAULTSORT Molecular Physics Category Molecular physics Category Atomic, molecular, and optical physics atomic physics stub ar be bg ca F sica molecular cs Molekulov fyzika de Molek lphysik es F sica molecular fa gl F sica molecular id Fisika molekular it Fisica molecolare he kk lt Molekulin fizika ms Fizik molekul nl Molecuulfysica ja no Molekylfysikk uz Molekular fizika pl Fizyka molekularna pt F sica molecular ru sr sv Molekylfysik tr Molek ler ... more details
Encyclopedia
top
