Neurotrophic and hepatotrophic stimulation of proliferation of embryonic chick muscle cells in vitro: Assay and partial characterization of mitogenic activity in chick embryonic organ and tissue extracts

Whole embryo extract is routinely employed as a growth-promoting supplement in chick embryonic muscle cell cultures. In assessing the effect of the extract on muscle cell cultures, extracts of various embryonic tissues and organs were substituted for whole embryo extract and the effects on proliferation of dissociated 12-day chick embryonic leg muscle cells were observed. The effects were measured according to [³H]thymidine incorporation into deoxyribonucleic acid (DNA) and were confirmed with total cell counts. Brain and liver extracts were found to be especially effective in stimulating muscle cell proliferation. The extracts were found to be heat and trypsin labile. Further analysis of activity in the extracts by dialysis and Sephadex G-25 fractionation revealed the presence of at least two classes of activity—one of high molecular weight (>5000) and one of low molecular weight (<5000)—which must be present together to yield the full activity of crude extracts from embryonic liver and brain. The results are discussed against the background of our interest in the neurotrophic phenomenon.     

Bacteriophage Mu-1-induced mutation to mutT in Escherichia coli.

Of approximately 10,000 independent phage Mu-1 lysogens, 3 had a mutator phenotype. One (mutation designated mut-49) resembled mutT1 in the frequency and types of mutations induced. mut-49 was mapped between leu and ace and was not separable from the Mu prophage. mut-49 was recessive and did not complement mutT1. mut-49, like mutT1, did not increase the reversion of the frameshift mutation lac Z (ICR48). mut-49 and mutT1 induced the same two classes of trpA78 revertants, indicating that mut-49 induced adenine-thymine leads to cytosine-guanine transversions. The results support previous work indicating that the mutational specificity of mutT is gene and not allele specific.     

When the same is not the same: phenotypic variation reveals different plant ecological strategies within species occurring in distinct Neotropical savanna habitats

Variations in abiotic characteristics such as soil water availability and fertility impose different selective pressures on plant populations. This may produce intraspecific variability in functional traits, even at a fine spatial scale. We investigated whether functional traits related to water-use efficiency, resource-retention strategy, soil nutrient acquisition, and fire tolerance differ in species that occur in two different habitats of Brazilian Cerrado: rocky savannas and savanna woodlands. Rocky savannas occur over sandstone, quartzite outcrops and have shallow nutrient-poor and low-moisture rocky soils, while savanna woodlands occur over well-drained and deep soils with frequent fire regimes. We measured nine functional traits of 40 tree species that occur in both habitats. Rocky savanna individuals exhibited a greater water-use efficiency strategy. The resource-retention strategy in rocky savanna individuals was corroborated by lower adult maximum height. However, despite the lower nutrient availability in rocky savanna soils, we only detected lower leaf phosphorus content in individuals from this habitat. Furthermore, individuals from both habitats had equally thick bark, suggesting that the fire-defense strategy is related to a stable, rather than plastic trait. Overall, our results highlight the central role of contrasting soil water availability patterns in driving phenotypic plasticity within species. We conclude that savanna species are responding to water and nutrient availabilities, via plasticity in traits related to the resource-retention strategy, and preparing for future fires, via uniformly thick bark. Wide plant distribution in contrasting habitats is possible for species that can shift ecological strategies to survive in nutrient- and water-limited habitats such as rocky savannas.     

Signatures of seaway closures and founder dispersal in the phylogeny of a circumglobally distributed seahorse lineage

Background  

The importance of vicariance events on the establishment of phylogeographic patterns in the marine environment is well documented, and generally accepted as an important cause of cladogenesis. Founder dispersal (i.e. long-distance dispersal followed by founder effect speciation) is also frequently invoked as a cause of genetic divergence among lineages, but its role has long been challenged by vicariance biogeographers. Founder dispersal is likely to be common in species that colonize remote habitats by means of rafting (e.g. seahorses), as long-distance dispersal events are likely to be rare and subsequent additional recruitment from the source habitat is unlikely. In the present study, the relative importance of vicariance and founder dispersal as causes of cladogenesis in a circumglobally distributed seahorse lineage was investigated using molecular dating. A phylogeny was reconstructed using sequence data from mitochondrial and nuclear markers, and the well-documented closure of the Central American seaway was used as a primary calibration point to test whether other bifurcations in the phylogeny could also have been the result of vicariance events. The feasibility of three other vicariance events was explored: a) the closure of the Indonesian Seaway, resulting in sister lineages associated with the Indian Ocean and West Pacific, respectively; b) the closure of the Tethyan Seaway, resulting in sister lineages associated with the Indo-Pacific and Atlantic Ocean, respectively, and c) continental break-up during the Mesozoic followed by spreading of the Atlantic Ocean, resulting in pairs of lineages with amphi-Atlantic distribution patterns.     

Solid-phase synthesis of oligosaccharides. V. Preparation of an inorganic support

D-Glucose side-chains were introduced into amylose and cellulose by condensation of tetra-O-acetyl-α-D-glucopyranosyl bromide with 6-trityl-2,3-dicarbanilate derivatives of the polysaccharides in nitromethane-p-dioxane in the presence of silver perchlorate (reaction A), and with the detritylated derivatives in acetonitrile-p-dioxane in the presence of mercuric cyanide and mercuric bromide (reaction B). The procedures were equally effective. The distance between the branch points in amylose was in the range 2–4 D-glucose residues, and 5–8 D-glucose residues in cellulose. Whereas considerable degradation of the backbone chain was found with reaction A, no degradation occurred in reaction B under suitable conditions. α-(1→6)-Links were preferably formed in reaction B, and β-(1→6)-links in reaction A.     

Evidence for template-specific sites in DNA polymerases

Using rabbit hemoglobin messenger RNA as template, $\text{E. coli}$ polymerase I produces poly (dT), poly (dA)·(dT) and antimessenger DNA products. Mild heating of the enzyme causes a differential loss in activity as indicated by three rates of inactivation for the three types of synthesis. Heat inactivation studies have also been carried out with DNA polymerases from oncogenic RNA viruses and mammalian sources using various homopolymer-oligomer pairs as primertemplates. In general, for any given enzyme these synthetic primer-templates reveal different extents of inactivation of the polymerase. These findings may be interpreted to suggest a) that the binding of DNA polymerase to various primer-templates produces conformational changes in the enzyme which are dependent on the type of template bound, or b) that many, if not all, DNA polymerases have different subsites for different templates.     

BiGG: a Biochemical Genetic and Genomic knowledgebase of large scale metabolic reconstructions

Background  

Genome-scale metabolic reconstructions under the Constraint Based Reconstruction and Analysis (COBRA) framework are valuable tools for analyzing the metabolic capabilities of organisms and interpreting experimental data. As the number of such reconstructions and analysis methods increases, there is a greater need for data uniformity and ease of distribution and use.