Spatial frequency tuned channels: implications for structure and function from psychophysical and computational studies of stereopsis

Various psychophysical experiments investigating the role of spatial frequency tuned channels in stereopsis are reviewed and a computational model of stereopsis deriving from these studies is described. The distinctive features of the model are: (1) it identifies edge locations in each monocular field by searching for zero crossings in non-orientated centre-surround convolution profiles; (2) it selects among all possible binocular point-for-point combinations of edge locations only those which satisfy a (quasi-) collinear figural grouping rule; (3) it presents a concept of the orientated and spatial frequency tuned channel as a nonlinear grouping operator. The success of the model is demonstrated both on a stereo pair of a natural scene and on a random-dot stereogram.     

Characterization of polymorphic microsatellite markers for the Carnaby's cockatoo (Calyptorhynchus latirostris) and related black cockatoo species

Microsatellite loci were isolated from Carnaby's black cockatoo (Calyptorhynchus latirostris: Aves), a highly valued, endangered, and endemic species of bird from Western Australia. This study describes three dinucleotide and one tetranucleotide microsatellite loci for which the primers produced clear and polymorphic amplification patterns with between two and nine alleles and moderate levels of variability. Two additional dinucleotide markers which were monomorphic in the Carnaby's cockatoo were able to amplify and were polymorphic in two other species of black cockatoo, greatly increasing the utility of these markers.     

Partial-digest DNA sequencing.

A technique called partial-digest sequencing that permits DNA of 4-6 kb in length to be sequenced without subcloning is described. The method exploits the specific cuts introduced by partial digestion with restriction endonucleases that have 4-base recognition sites to produce ordered ladders of PCR-amplified fragments. The staggered ends contain PCR primers and can thus be individually sequenced using conventional methods to yield overlapping sequences covering the entire region. This method should have significant impact on both large and small DNA sequencing projects and find many applications in general manipulations in which ordered sets of deletions need to be produced.     

Purification and characterization of a lysophospholipase from human amnionic membranes

We have identified the presence of a lysophospholipase in human placental tissues and have purified this enzyme from the amnion. The specific activity was highest in the amnion and decreased across adjacent tissues. The purification involved the use of DEAE-Sephadex, phenyl-Sepharose, hydroxylapatite, and sulfylpropyl Sephadex chromatography. The activity of the purified enzyme toward palmitoyl lysophosphatidylcholine is 2.5 mumol min-1 mg-1 and the pH optimum is 7.0. The enzyme is not inhibited by EDTA and does not appear to have a metal ion requirement. The enzyme may be of membrane origin; the purified enzyme requires the presence of detergent during storage. The effects of substrate composition and physical state on enzymatic activity were explored. The enzyme was not active toward mono-, di-, or triglycerides, nor toward diacyl phospholipid. The enzyme was active toward myristoyl and palmitoyl lysophosphatidylcholine at concentrations where these substrates spontaneously form micelles or where Triton X-100 was used to induce co-micellization of the substrate at low concentrations with detergent. A role for this enzyme in processing the lysophospholipid product of phospholipase A action must be considered in evaluating arachidonic acid production in human fetal membranes and placental tissue, particularly during the initiation of labor.     

Parental spleen cells accelerate the development of intestinal brush border structure and function in neonatal mice

The influence of parental spleen cells on the postnatal development of brush border microvillus membrane structure and the ability to transport lysine and alanine has been studied in the mouse jejunum during the second week of postnatal life. Control tissue taken from 7-11 day old mice has an unchanging crypt-villus structure and a low enterocyte migration rate of about 1 micron hr-1. Microvillus elongation in crypt enterocytes takes 6 days to complete under these conditions. Lysine and alanine transport begin 2 days after structural differentiation has ceased. Parental spleen cells injected into 1-2-day-old F1 mice cause crypt cell hyperplasia, villus shortening and a 3-6-fold increase in enterocyte migration rate after a period of 8 days. These effects are associated with large reductions in the time needed to complete microvillus membrane development and first express absorptive function. Lysine and alanine transport begin approximately 6 hr after structural differentiation has ceased under these conditions. Adaptive changes in the development of enterocyte structure and function, induced by injection of parental spleen cells, bear some resemblance to other changes found to occur normally at weaning and in adult animals subjected to controlled changes in diet and environmental temperature. The possibility that common principles govern enterocyte adaptation and that some of these still apply in an intestine undergoing an immune reaction is discussed.     

Circadian rhythm of serum and tissue lipids in fed and fasted rats

The oscillations of the free fatty acid concentration in the serum and white (epididymal) adipose tissue, of triglycerides in the serum and liver, of total serum, liver and adrenal cholesterol and of serum phospholipids were studied at 3-hour intervals for a period of 24 hours in fed male Wistar rats and in animals fasted for 24 hours (both adapted to an illumination regimen of 12 hours' light and 12 hours' darkness. The rhythm--studied by means of the cosinor analysis--was present in most of the given parameters; it was not recorded in the liver triglycerides and serum phospholipids of fasted rats and in the adrenal cholesterol of fed animals. Apart from the circadian rhythm, many parameters distinctly displayed an ultradian rhythm, mainly an approximately 12-hour period. In general, one day's starvation did not significantly affect the course of the circadian oscillations of the given indicators of rat lipid metabolism.     

Mutation of residues 423 (Met/Ile), 444 (Thr/Met), and 506 (Asn/Ser) confer cholesteryl esterase activity on rat lung carboxylesterase. Ser-506 is required for activation by cAMP-dependent protein kinase.

Site-directed mutagenesis is used to identify amino acid residues that dictate reported differences in substrate specificity between rat hepatic neutral cytosolic cholesteryl ester hydrolase (hncCEH) and rat lung carboxylesterase (LCE), proteins differing by only 4 residues in their primary sequences. Beginning with LCE, the substitution Met(423) --> Ile(423) alone or in combination with other mutations increased activity with p-nitrophenylcaprylate (PNPC) relative to more hydrophilic p-nitrophenylacetate (PNPA), typical of hncCEH. The substitution Thr(444) --> Met(444) was necessary but not sufficient for expression of cholesteryl esterase activity in COS-7 cells. The substitution Asn(506) --> Ser(506), creating a potential phosphorylation site, uniformly increased activity with both PNPA and PNPC, was necessary but not sufficient for expression of cholesteryl esterase activity and conferred susceptibility to activation by cAMP-dependent protein kinase, a property of hncCEH. The 3 mutations in combination were necessary and sufficient for expression of cholesteryl esterase activity by the mutated LCE. The substitution Gln(186) --> Arg(186) selectively reduced esterase activity with PNPA and PNPC but was not required for cholesteryl esterase activity. Homology modeling from x-ray structures of acetylcholinesterases is used to propose three-dimensional models for hncCEH and LCE that provide insight into the effects of these mutations on substrate specificity.     

Neutral glycosphingolipids of murine lymphoma EL-4

Neutral glycosphingolipids of murine T-lymphoma EL-4 were studied. The major glycolipid components were identified as GlcCer, LacCer, GgOse3Cer and GgOse4Cer. It has been shown for the first time that not only gangliosides but also neutral glycolipids are shed from the cell surface into the outer medium.