ABSTRACT
This article documents the addition of 238 microsatellite marker loci and 72 pairs of Single Nucleotide Polymorphism (SNP) sequencing primers to the Molecular Ecology Resources Database. Loci were developed for the following species: Adelges tsugae, Artemisia tridentata, Astroides calycularis, Azorella selago, Botryllus schlosseri, Botrylloides violaceus, Cardiocrinum cordatum var. glehnii, Campylopterus curvipennis, Colocasia esculenta, Cynomys ludovicianus, Cynomys leucurus, Cynomys gunnisoni, Epinephelus coioides, Eunicella singularis, Gammarus pulex, Homoeosoma nebulella, Hyla squirella, Lateolabrax japonicus, Mastomys erythroleucus, Pararge aegeria, Pardosa sierra, Phoenicopterus ruber ruber and Silene latifolia. These loci were cross-tested on the following species: Adelges abietis, Adelges cooleyi, Adelges piceae, Pineus pini, Pineus strobi, Tubastrea micrantha, three other Tubastrea species, Botrylloides fuscus, Botrylloides simodensis, Campylopterus hemileucurus, Campylopterus rufus, Campylopterus largipennis, Campylopterus villaviscensio, Phaethornis longuemareus, Florisuga mellivora, Lampornis amethystinus, Amazilia cyanocephala, Archilochus colubris, Epinephelus lanceolatus, Epinephelus fuscoguttatus, Symbiodinium temperate-A clade, Gammarus fossarum, Gammarus roeselii, Dikerogammarus villosus and Limnomysis benedeni. This article also documents the addition of 72 sequencing primer pairs and 52 allele specific primers for Neophocaena phocaenoides.
ABSTRACT
Twenty-one microsatellite markers were studied in three meiogynogenetic families of Cynoglossus semilaevis gunther for centromere mapping using half-tetrad analysis. Among the 13 mapped loci, 10 were estimated to be located in the telomeric region, one in the centromeric region, and two in the intermediate region of the chromosome. This study provides a basis for constructing a linkage map of C. semilaevis.
Subject(s)
Centromere/genetics , Chromosome Mapping , Flatfishes/genetics , Microsatellite Repeats/genetics , Spermatozoa , Animals , Diploidy , Female , Fisheries/methods , Genotype , MaleABSTRACT
Although sperm from several fish species have been successfully cryopreserved, few studies have been done in small and/or endangered species. The aim of the present work was to develop a method of freezing and refreezing Varicorhinus macrolepis semen in 1.8 mL cryovials. The effect of extenders and cryoprotectants on the motility of post-thaw sperm was examined. The motility of frozen-thawed sperm in extender D-15 was higher than that in MPRS and fish Ringer solution (P<0.05). Dimethyl sulfoxide (DMSO) and glycerol provided greater protection to sperm than methanol during freezing and thawing; the most effective concentration of DMSO and glycerol was 10%. The fertilization rate of frozen-thawed sperm was not significantly different from that of fresh sperm. Furthermore, mean (+/-S.D.) hatching rate did not differ significantly between frozen-thawed (82.7+/-12.4%) and fresh sperm (90.7+/-4.5%). Although frozen-thawed sperm that was immediately refrozen had 0% post-thaw motility, frozen semen that was refrozen after dilution with D-15 (containing DMSO at a ratio of 1:2) had post-thaw motility of 38.3+/-2.9%. Motility was lower for refrozen than for frozen sperm (P<0.05). Furthermore, fertilization and hatching rates of refrozen sperm were 42.9+/-6.7 and 34.1+/-10.5%, respectively, which were lower than that of fresh sperm (P<0.05).
Subject(s)
Cryopreservation , Cyprinidae/physiology , Eggs , Fertilization/physiology , Spermatozoa/physiology , Animals , Cryoprotective Agents/pharmacology , Female , Fertilization/drug effects , Freezing , Male , Semen Preservation/adverse effects , Sperm Motility/drug effects , Spermatozoa/cytologyABSTRACT
The cystathionine beta-Synthase (CBS) gene of Pichia pastoris has been cloned by homology to the CBS gene of Saccharomyces cerevisiae. First, based on the homology alignment of CBS genes from different sources, a pair of degenerate PCR primers were designed to amplify a conservative fragment of Pichia pastoris CBS gene. After the sequence was revealed, 5' RACE and 3' RACE were performed separately. The whole sequence of Pichia pasotris CBS gene was assembled. This gene encodes a polypeptide of 501 residues. Comparison of deduced amino acid sequence of this new gene with that of S. cerevisiae CBS showed 54% identity. Disruption of CBS gene resulted in a Cys(-) auxotrophy in Pichia pastoris. Thesequence was submitted to GenBank/EMBL/DDBJ under Accession No.AF367364.
ABSTRACT
A new natural compound squamosamide isolated from Annona squamosa, was synthesized. This compound was characterized by 1H, 13CNMR and MS.
