Limits of artificial selection under unbalanced mating systems

Summary The influence of unbalanced mating systems — factorial mating (FM) and random loss of families after a full diallel crossing (RS) — on the ultimate probability of gene fixation (u()) and the time required to fix or lose a gene (t()) are investigated. The average u() of these systems is smaller than that of random mating, and the range of u() for a given initial parental genotype combination is very large (close to one for most initial genotypic combinations). The average u() of different parental genotypic combinations of a given gene frequency are different. These systems accelerate the t().This article was written and prepared by U.S. Government employees on official time, and it is therefore in the public domain     

A fluorescent derivative of ribosomal protein S18 which permits direct observation of messenger RNA binding.

70 S Escherichia coli ribosomes were reacted with the fluorescent dye N-(iodoacetylaminoethyl)-5-naphthylamine-1-sulfonic acid for 10 min under mild conditions. The resulting ribosomes were fully active. 30 S subunits isolated from these particles were also fully active. They contain approximately 0.7 eq of fluorescent dye. Nearly all of it is attached to protein S18. Competitive reaction with N-ethylmaleimide implies that the fluorescent dye is located at cysteine 10 of the protein. The labeled 30 S particles will recombine with 50 S subunits to form stable 70 S particles. Thus the procedures we have developed allow the large scale preparation of an active fluorescent conjugate of the 70 S ribosome. The fluorescence of the 70 S particles is sensitive to the binding of mRNA, showing both quenching and a shift in emission spectra. Thus it affords a simple way to quantitate mRNA binding directly. In pilot studies without tRNA, the binding constant of the initiation triplet codon adenylyl-(3' leads to 5')-uridylyl-(3' leads to 5')-guanosine to 70 S ribosome was found to be an order of magnitude larger than that of polyuridylic acid.     

氦氖激光对绵羊精清中酶活性效应的研究

本文研究结果表明低剂量的氦氖激光可以提高绵羊精清中GOT和LDH酶的活性,并对其机制作了初步的探讨。     

A novel fluorescent ceramide analogue for studying membrane traffic in animal cells: accumulation at the Golgi apparatus results in altered spectral properties of the sphingolipid precursor

A series of ceramide analogues bearing the fluorophore boron dipyrromethene difluoride (BODIPY) were synthesized and evaluated as vital stains for the Golgi apparatus, and as tools for studying lipid traffic between the Golgi apparatus and the plasma membrane of living cells. Studies of the spectral properties of several of the BODIPY-labeled ceramides in lipid vesicles demonstrated that the fluorescence emission maxima were strongly dependent upon the molar density of the probes in the membrane. This was especially evident using N-[5-(5,7-dimethyl BODIPY)-1-pentanoyl]-D-erythro-sphingosine (C5-DMB-Cer), which exhibited a shift in its emission maximum from green (integral of 515 nm) to red (integral of 620 nm) wavelengths with increasing concentrations. When C5-DMB-Cer was used to label living cells, this property allowed us to differentiate membranes containing high concentrations of the fluorescent lipid and its metabolites (the corresponding analogues of sphingomyelin and glucosylceramide) from other regions of the cell where smaller amounts of the probe were present. Using this approach, prominent red fluorescent labeling of the Golgi apparatus, Golgi apparatus-associated tubulovesicular processes, and putative Golgi apparatus transport vesicles was seen in living human skin fibroblasts, as well as in other cell types. Based on fluorescence ratio imaging microscopy, we estimate that C5-DMB-Cer and its metabolites were present in Golgi apparatus membranes at concentrations up to 5-10 mol %. In addition, the concentration-dependent spectral properties of C5-DMB-Cer were used to monitor the transport of C5-DMB-lipids to the cell surface at 37 degrees C.     

Immunohistochemical localization of 36 and 29 kDa proteins in sparganum.

Antigenic proteins of 36 and 29 kDa were localized in Spirometra mansoni plerocercoid (sparganum) immunohistochemically by avidin biotin complex (ABC) staining. When polyclonal antibodies such as BALB/c mouse serum immunized with crude saline extract of sparganum or confirmed sparganosis sera were reacted as primary antibodies, the positive chromogen (3-amino, 9-ethylcarbazole) reactions were recognized at syncytial tegument, tegumental cells, muscle and parenchymal cells and lining cells of excretory canals. A monoclonal antibody (MAb) which was reacting to 36 and 29 kDa proteins in the extract of the worm was localized at the syncytial tegument and tegumental cells. The present results suggested that the potent antigenic proteins of 36 and 29 kDa in sparganum were produced at the tegumental cells and transported to the syncytial tegument.     

Studies on glycosaminoglycans of regenerating rabbit ear cartilage

Cartilage regeneration in the adult rabbit ear was examined with respect to glycosaminoglycan (GAG) synthesis at various stages of the regeneration process. Increased hyaluronic acid and chondroitin sulfate synthesis was first seen 31 days after wounding, when a metachromatic cartilage matrix could be distinguished from blastemal cells. Analysis of cartilage and the overlying skin separately showed that 90% of the labeled chondroitin sulfate was found in the cartilage being regenerated. DEAE-cellulose chromatography of GAG preparations from 35-day regenerating cartilages showed hyaluronic acid and chondroitin sulfate peaks eluting in the same position as those isolated from normal cartilages. The identity of the hyaluronic acid and chondroitin sulfate peaks was confirmed by their susceptibility to Streptomyces hyaluronidase and chondroitinase ABC, respectively. Although the degree of sulfation in normal and regenerated cartilages was similar, the ratio of chondroitin 6-sulfate to chondroitin 4-sulfate was increased in regenerated cartilages. GAG preparations from unlabeled cartilages were digested with chondroitinase ABC and the disaccharide digestive products were identified and quantitiated. Normal cartilage had a $\text{Δ}\text{Di-6S}\text{Δ}\text{Di-4S}$ ratio of 0.27; the same ratio for the regenerated cartilage was 1.58.     

Electron paramagnetic and electron nuclear double resonance of the hydrogen peroxide compound of cytochrome c peroxidase

We have collected electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) spectra from the hydrogen peroxide compound of yeast cytochrome c peroxidase, termed ES, employing EPR microwave frequencies of 9.6 and 11.6 GHz. We have measured and analyzed the temperature dependence of the spin-lattice relaxation rate (1/T1) of the paramagnetic center of ES over the temperature range 1.9 to 4 K. In addition, an upper bound to exchange coupling between the ferryl heme and EPR-visible centers of ES has been calculated and expressions for the dipolar interaction between a ferryl heme and a free radical have been derived. These results all confirm that the EPR signal of ES is not associated with an aromatic amino acid radical, and in particular not with a tryptophanyl radical. This conclusion has led us to consider an explanation of the EPR signal in terms of a nucleophilically stabilized methionyl radical.     

Ectoprotein kinase activity of the isolated rat adipocyte.

Intact adipocytes exhibit ectoprotein kinase activity as reflected by their ability to catalyze the transfer of the terminal phosphate of (γ-³²P) ATP to histone added to a cell suspension. This activity is substrate, time and cell number dependent. Lineweaver-Burk plots gave Km and Vmax values for ATP of 5 × 10^?5 M and 7.14 pmoles/min/1.5 × 10⁵ cells. Cyclic AMP but not cyclic GMP in μM concentrations stimulates ectoprotein kinase activity. The controlled tryptic digestion of intact cells results in reduction of ectoprotein kinase activity. This activity is not due to leakage of intracellular protein kinases during the preparative procedure nor to penetration of histone into the cells. Additional phosphoproteins not accessible to endogenous protein kinase activity are also localized on the external surface of the intact fat cell.     

The amino acid sequence of chick skin collagen α1-CB7: The presence of a previously unrecognized triplet

Because alignment of the amino acid sequences of chick skin collagen α2-CB3 (1) with the relevant portion of chick skin collagen α1-CB7 (2) suggested that a Gly-X-Y triplet may have been missed in the latter, the peptide TM-2, produced by tryptic digestion of maleylated α1-CB7, was reinvestigated. Cleavage by trypsin at the unblocked lysine at position 18, and isolation of the resulting COOH-terminal peptide, showed this to be a 15-residue peptide containing a previously unrecognized Gly-Pro-Hyp triplet. Sequencing of the peptide showed this to occupy positions 4 through 6, or 56 through 58 of α1-CB7. The latter thus has 271 instead of 268 residues, and the α1[I] chain 1055 instead of 1052.