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Associative and Endophytic Nitrogen-fixing Bacteria and Cyanobacterial Association
Associative and Endophytic Nitrogen-fixing Bacteria and Cyanobacterial Association

... 2.1. Use of 16-rDNA as Phylogenetic Marker Due to its wide and successful use as phylogenetic marker, the 16S-rDNA provides an indispensable tool for the classification and identification of bacteria. In contrast to other cellular RNA-species, the ribosomal RNA´s occur in very high copy number per a ...
Molecular pathogenesis of liver adenomas and FNH - HAL
Molecular pathogenesis of liver adenomas and FNH - HAL

... these tumors. Novel markers specific to these subtypes have been developed, implicating a potential for use in clinical practice. In this review, we will focus on the recent progress in understanding of the molecular mechanisms in these two hepatocellular tumors. 1 - Focal Nodular Hyperplasia (FNH) ...
ch 11 genetics 2
ch 11 genetics 2

... The gene combinations that might result from a genetic cross can be determined by drawing a diagram known as a Punnett ...
Topologically Non-linked Circular Duplex DNA
Topologically Non-linked Circular Duplex DNA

... 1981). It was first observed in synthetic copolymers. It is not considered to be the structure of purified DNA in solution for any DNA obtained from natural sources, so that the presumption that DNA from natural sources can exist in the left-handed configuration is unproven. Nevertheless, we need to ...
Breeding in Apomictic Species - public.iastate.edu
Breeding in Apomictic Species - public.iastate.edu

... embryo develops as a bud-like structure through mitotic division of somatic cells of the ovule, integuments or ovary wall. Diplospory is more difficult to identify and requires cytological observations at earlier ovule development than the two previous mechanisms. Lack of meiosis or a linear tetrad ...
Review: Is genetic screening for hemochromatosis worthwhile?
Review: Is genetic screening for hemochromatosis worthwhile?

... commonly in relatives of patients [15–22]. Studies of the transmission of the disease in families suggest that hemochromatosis segregates usually as an autosomal recessive trait [15, 18, 23]. Genetic and phenotypic heterogeneity are well-recognised features in hemochromatosis and it is becoming more ...
proximate-ultimate-ms-feb2014 (Harvard) - Philsci
proximate-ultimate-ms-feb2014 (Harvard) - Philsci

... Gene pools of one generation only become gene pools of the next generation via phenotypes. The PUD implies a historically continuous lineage of gene pools with phenotypic offshoots (as shown in Figure 1) when, in fact, gene pools and phenotypes must be seen as occurring in series. On this view, caus ...
Unit F215
Unit F215

... determined by the length of DNA that actually codes for the polypeptide. In this case, there is a promoter and terminator (which indicate where to start and finish transcription) and the operator (which regulates the activity of three different genes, coding for proteins that are responsible for the ...
Analyzing the Paper
Analyzing the Paper

... methodology] down on paper into a fairly prominent journal. Had this gotten into Science or Nature, I wouldn't have had the space, and there's no way they would have accepted such heresy" JSM ...
Nucleic Acid Structures, Energetics, and Dynamics
Nucleic Acid Structures, Energetics, and Dynamics

... and Crick,1 proposed that DNA was a double helix of antiparallel strands held together by hydrogen bonds between complementary bases: guanine and cytosine or adenine and thymine. Their model followed from the fact that this was the only way that pairs of hydrogen-bonded bases in their correct keto t ...
Molecular approaches for bacterial azoreductases
Molecular approaches for bacterial azoreductases

... Shatzman, 1999). Some expression systems require the use of specialized host strains which provide regulatory elements. Use of protease-deficient host strains (e.g. BL21) can sometimes enhance product accumulation by reducing degradation. The gene on the host cell chromosome usually has an inducible ...
Full-Text PDF
Full-Text PDF

... involved, and mutations in these genes may lead to the various diseases mentioned. Almost all these genes are encoded by the nuclear genome, and only a few, coding for some components of the respiratory chain, tRNAs and rRNAs, are encoded by the mitochondrial genome. In humans, this amounts to a tot ...
What is a biofilm?
What is a biofilm?

... • The periplasmic glucans slow the diffusion of antibiotics into the cytoplasm, giving the bacteria time to adapt to the antibiotic ...
Gene mutations and papillary thyroid cancer
Gene mutations and papillary thyroid cancer

... The rate of diagnosis of papillary thyroid cancer has increased markedly in the past 20 years. Many cancers have mutations in cancer-associated genes that are thought to have caused the cancer. Analysis of mutations in cancer-associated genes are helpful in making a diagnosis of cancer on a thyroid ...
Document
Document

... • Where is the SNP mapped? Exon, promoter, UTR, etc  picture of gene with mapped to the gene structure. • How was it discovered? Method • What assurances do you have that it is real? Validated how? • What population – African, European, etc? • What is the allele frequency of each SNP? Common (>10%) ...
Cluster Analysis for Gene Expression Data
Cluster Analysis for Gene Expression Data

... functional categories, the addition of more and diverse conditions can only enhance those observation [Eisen1998]. Eisen et. al. applied a hierarchical clustering algorithm to two sets of data: gene expression of primary human fibroblasts stimulated with serum following serum starvation and gene exp ...
Evolution
Evolution

... Which of the following describes characters of organisms that have seemingly lost most or all of their function in a species through evolution? ...
Recent approaches into the genetic basis of inbreeding depression
Recent approaches into the genetic basis of inbreeding depression

... lines support this prediction. More direct biometric approaches provide strong support for the importance of partly recessive deleterious alleles. Investigators using molecular markers to study quantitative trait loci (QTL) often find support for overdominance, though pseudo-overdominance (deleterio ...
Birth Defects
Birth Defects

... In some cases, a single gene change can cause birth defects. Every human being has about 20,000 to 25,000 genes that determine traits like eye and hair color (3). Genes also direct the growth and development of every part of our physical and biochemical systems. Genes are packaged into each of the 4 ...
What are major histocompatibility complex genes and why are they
What are major histocompatibility complex genes and why are they

... HLA and Pregnancy Loss Couples with high degree of HLA sharing may experience poor pregnancy outcome ...
Nucleotide sequence and taxonomic value of the
Nucleotide sequence and taxonomic value of the

... Although C . pneumoniae is a common human respiratory pathogen (Grayston et al., 19896; Marrie et al., 1987), very little is known about the immunochemistry of this organism. One problem is that C. pneumoniae is difficult to isolate in tissue culture. Immunochemical and genetic studies should lead t ...
Time-shift and inverse clustering of expression data finds new
Time-shift and inverse clustering of expression data finds new

... experiment); we found that genes strongly related by local clustering were considerably more likely than random to have a known interaction or a similar cellular role. This suggests that local clustering may be useful in functional annotation of uncharacterized genes. We examined many of the new rel ...
News from the west: Ancient DNA from a French megalithic burial
News from the west: Ancient DNA from a French megalithic burial

... of significant post-Neolithic migrations, they proposed a Paleolithic ancestry for modern Europeans. Nonetheless, two recent publications (Bramanti et al., 2009; Malmström et al., 2009) reported sequences from late European hunter-gatherers that demonstrated genetic differentiation between ancient h ...
Centromere Locations and Associated Chromosome
Centromere Locations and Associated Chromosome

... CEN5 is more complex. The formation of chromosome V of A. thaliana involved a reciprocal translocation (see above and Figure 1), and an understanding of this event is critical for interpreting the origin of CEN5. Previous comparative molecular cytogenetic analyses of A. thaliana and A. lyrata could ...
Trawling DNA Databases for Partial Matches: What is the FBI Afraid
Trawling DNA Databases for Partial Matches: What is the FBI Afraid

... DNA evidence is often presented as the "gold standard"for forensic science. But this was not always the case. For years, eminent scientists complained that the estimates of the tiny frequencies of DNA types were unfounded. It took scores of research papers, dozens of judicial opinions, and two commi ...
< 1 ... 109 110 111 112 113 114 115 116 117 ... 1937 >

Microevolution

Microevolution is the change in allele frequencies that occur over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow, and genetic drift. This change happens over a relatively short (in evolutionary terms) amount of time compared to the changes termed 'macroevolution' which is where greater differences in the population occur.Population genetics is the branch of biology that provides the mathematical structure for the study of the process of microevolution. Ecological genetics concerns itself with observing microevolution in the wild. Typically, observable instances of evolution are examples of microevolution; for example, bacterial strains that have antibiotic resistance.Microevolution over time leads to speciation or the appearance of novel structure, sometimes classified as macroevolution. Macro and microevolution describe fundamentally identical processes on different scales.
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