A case of internal coronal resorption in a maxillary first permanent molar of a young adult is described. Conservative treatment was done, which included endodontic therapy followed by coronal restoration with bonded composites. The importance of early diagnosis and treatment of the resorptive defect is stressed.
The high-density lipoproteins (HDLs) found in the male and female hemolymph of Penaeus semisulcatus de Haan were isolated by NaBr (1.22 g/ml) followed by sucrose gradient (5-25%) ultracentrifugation. The male HDL contained one protein, lipoprotein 1 (LP1), composed of one 110-kDa peptide subunit. The female HDL contained two proteins: 1) the LP1 that was immunoidentical to the male LP1 and was similarly composed of one 110-kDa peptide subunit and 2) vitellogenin (Vg), reacting positively with the rabbit antiserum generated against vitellin (Vt) that was isolated from vitellogenic ovaries. Both Vg and Vt consisted mainly of three polypeptide subunits (200, 120, and 80 kDa) as revealed by denatured PAGE and Western blot. The LP1 from males or females did not react with the Vt rabbit antiserum. Similarly, Vg and Vt did not react with the rabbit antiserum prepared against LP1. Phospholipids (PL) constituted 71-76% of the total lipids in the hemolymph and HDLs of both male and female hemolymph. Cholesterol (Ch) amounted to 17-20%, and small amounts (5%) of diacylglycerols (DAG) were also carried by these HDLs. Both the PL and DAG contained highly unsaturated fatty acids (20:5 omega 3 and 22:6 omega 3) that are transported from the food or hepatopancreas to the tissues, including the vitellogenic ovaries in females. In the present study we show for the first time the separate lipid composition of female LP1 and Vg and compare them with the lipids attached to the Vt. Vg had a lower lipid content than LP1 (540 and 1089 mg/g protein, respectively). Differences were also found in the relative abundance of PL, Ch, and DAG classes in the LP1 in comparison with Vg. Furthermore, small amounts (approximately 3.8%) of triacylglycerols (TAG) were found only in the hemolymph of vitellogenic females, and they were associated with the Vg. Although Vg and Vt were composed of similar polypeptides, their lipid composition was different Vt, in contrast to Vg, carried considerable amounts of TAG (approximately 22%) and only trace amounts of DAG. The significance of the TAG in the hemolymph of vitellogenic females is not known, and the functional relationship between Vg and Vt requires future extensive studies. Lipids were not detected in hemocyanin that was purified from clotted hemolymph.
Various methods have been used to synthesize Ba(THD)2 and its molecular structure has been studied using nuclear magnetic resonance. Compared with Raman and infrared spectroscopy it was found that NMR is very useful to determine quantitatively the decomposition through aging of Ba(THD)2. The transport kinetics of Ba(THD)2 has been studied under experimental conditions of a OMCVD reactor. It has been found that the freshly prepared Ba(THD)2 by the reaction of Ba metal with THD ligand in anhydrous conditions with subsequent crystallization from methanol transported quantitatively without decomposition. A simple model shows that the transport kinetics corresponds to a diffusion controlled process.
Otefin is a peripheral protein of the inner nuclear membrane in Drosophila melanogaster. Here we show that during nuclear assembly in vitro, it is required for the attachment of membrane vesicles to chromatin. With the exception of sperm cells, otefin colocalizes with lamin Dm0 derivatives in situ and presumably in vivo and is present in all somatic cells examined during the different stages of Drosophila development. In the egg chamber, otefin accumulates in the cytoplasm, in the nuclear periphery, and within the nucleoplasm of the oocyte, in a pattern similar to that of lamin Dm0 derivatives. There is a relatively large nonnuclear pool of otefin present from stages 6 to 7 of egg chamber maturation through 6 to 8 h of embryonic development at 25 degrees C. In this pool, otefin is peripherally associated with a fraction containing the membrane vesicles. This association is biochemically different from the association of otefin with the nuclear envelope. Otefin is a phosphoprotein in vivo and is a substrate for in vitro phosphorylation by cdc2 kinase and cyclic AMP-dependent protein kinase. A major site for cdc2 kinase phosphorylation in vitro was mapped to serine 36 of otefin. Together, our data suggest an essential role for otefin in the assembly of the Drosophila nuclear envelope.
This paper conceptualizes the role of Israel's high technology sector as that of a node in a global production network. A node can be characterized by the intensity of the incoming and outgoing flow of information, investments and so on, that pass through it. Foreign investment is one indicator of the centrality of a node. Using case study and aggregate firm level evidence of US foreign investment in Israeli high technology, the paper tests the hypothesis that foreign involvement in the node economy is based on a rather different set of forces than those suggested by the foreign investment literature. The results seem to indicate the importance of node-type factors such as the centrality of small firms in R&D activity and labour force stability, rather than the standard determinants such as incentives, labour costs and infrastructure. The implications and policy issues relating to the development of a node economy are discussed.
The interactions between gelatin and sodium dodecyl sulfate (SDS) were studied, and the conditions which favor formation of insol. complex of gelatin-SDS were applied to form microcapsules of oil droplets. It was found that the insol. complex is formed only while the protein has a net pos. charge, at pH 4.0 and only at a narrow range of surfactant concns., below the crit. micellar concn. The compn. of the coating layer around the oil droplets was evaluated as a function of SDS/gelatin ratio. The maximal adsorbed amt. of gelatin and SDS on the oil droplets corresponds to the SDS concn. in which the zeta potential was minimal and in which insol. gelatin-SDS particles were obtained in absence of the oil phase. [on SciFinder(R)]
This article describes the key elements of a computerized spreadsheet model that can be used by public officials and agency staff to assess in advance the likely economic and fiscal effects of economic development projects. While the model in its current state is based on Chicago, local data can be used to adapt it to other places. The project is innovative in its use of current economic theory, data, and tools to create a model useable on a routine basis by non-specialist public agency staff. The aim is to narrow the gap between academic economic analysis and public sector practice. A key element of the model is that it was developed in close cooperation with staff of the Chicago Department of Planning and Development and combines rigorous economic analysis with the political priorities and choices of public agency staff. Also, the model includes key data about the local economy and standard industry data, but can be overridden by an analyst if project-specific information is available.
Two narrative feature sets of Modern Literary Welsh are studied, on the basis of a mixed corpus (works by Kate Roberts, J.G. Williams, Islwyn Ffowc Elis, Y Faner): First, the infinitive (Alias verb-noun) co-ordinated to a finite verb form, as constituent of a compound “micro-episodal” narrative tense; the infinitive as an “entry-making” form, in a special system of diary syntax, which is here scanned in some detail; the reminiscent “condensing” infinitive; the infinitive presented in narrative by dyma, for narrative changes and episode-opening in dramatic highlight. The highlighting delimitative converters mi- and fe- are discussed in the context of manipulative “dramatic” narrative staging. Second, the aorist (alias [future-] present) as a main narrative-evolution carrier tense-form in complex autobiographical narrative systems.
A time-dependent quantum mechanical method for propagating the wave function on several electronic states is discussed for the polyatomic case and illustrated by the quenching collision of a Na (3p P-2) atom by H-2. The specification of method is governed by the need to have a clear physical interpretation of the results, by the recognition that the motion on a given electronic state can often (but not always) be well approximated by classical mechanics, and by the need for a computational procedure that is simple enough to handle polyatomic systems. These desiderata are realized by the spawning technique which is discussed in detail. One more feature of the method is that it allows for a smooth interface with the methodologies of quantum chemistry so that the electronic structure problem can be solved simultaneously with the time propagation of the nuclear dynamics. The method is derived from a variational principle and so can yield quantum mechanically numerically converged results. The parameters that govern the numerical accuracy of the method are explicitly discussed with special reference to their physical significance. The quenching of a Na (3p P-2) atom by H-2 due to a conical intersection of two potential energy surfaces is used as a computational example since it illustrates many of the features of the method. This collision is found to be sticky and exhibits many sequential nonadiabatic couplings, each of which is localized in time, where the quenching probability per traversal of the conical intersection region is small. However, the accumulated transfer of population to the ground state can be significant since the duration of the overall transfer is spread over many vibrational periods of H-2.
Assembling quinolinium-based chromophores on silicon surfaces provides a new route to electronic control over such semiconducting surfaces. The two-step process by which the molecules are grafted on to the surface involves first coupling the organic functionality to silicon, followed by chromophore anchoring. These synthetic steps are monitored by XPS, UV-Vis and FTIR spectroscopies. Using contact potential difference measurements we found that the electron affinity of the modified silicon is a function of the molecule's dipole moment. The same technique shows a pronounced effect of the sub-nanometer siloxane-based, coupling-agent, layer by itself on the band bending and band-bending modification as function of chromophore adsorption.
Chemical reaction dynamics is making increasing contact with `real' chemistry: examination of more elaborate reaction mechanisms typical of organic chemistry, the study of chemical reactions where the medium plays an active role (as is often the case in solution and on surfaces) and the ability to mimic systems of biochemical complexity are all of current interest. Much of our early conceptual understanding was acquired by the study of isolated, simple chemical exchange reactions in which one bond is broken and another bond is formed, in concert. A central feature in these reactions is the high selectivity which can be achieved by the choice of initial conditions and the considerable specificity of the resulting products. These themes do carry over to the world of more complex systems. Applications discussed include four center reactions, activated chemical reactions in solution, in clusters and on surfaces and photochemical processes. Surprisal analysis, long used to characterize the selectivity and specificity in simple reactions, is equally applicable here and the dynamical origin for the approach is discussed. The primary conclusion is that at the dawn of the new millennium, chemical reaction dynamics is ready to make inroads into the world of reactions of realistic complexity.
Two structural-thermodynamic characteristics of cylindrical, wormlike micelles in dilute solution are studied using a molecular-level model: (a) the bending elasticity of the micelles and (b) their tendency to form intermicellar junctions (branches). The internal (free) energy of the micelles, before and after a bending deformation and junction formation, are calculated using mean field theories for the free energies of the molecules constituting these structures. The molecular free energies, which depend on the local packing geometries, include the contributions of head group repulsion forces, the hydrocarbon-water interfacial energy, and the chain conformational free energy. We find that when only the head group and surface contributions to the packing energy art:taken into account, the one-dimensional bending constant of the micelles is negligibly small, When the chain contribution is included, and when reasonable molecular packing parameters are used, we find that the persistence length, which is proportional to the bending rigidity, is typically a few tens of nanometers. The free energy change associated with the formation of a trijoint intermicellar junction upon the `'fusion'' of one micellar end cap with the cylindrical body of another micelle is found to be small but positive; about 10 k(B)T at room temperature. This conclusion does not refute ?he possibility that intermicellar junctions are metastable transients or that their formation may be favored entropically, due either to conformational degeneracy or excluded volume interactions between micelles. Our conclusions apply to aqueous solutions containing one, single-tail, surfactant species.
The late Ida Kaplan was the sister of Yosef (Josef) Kaplan, one of the leaders of the Hashomer Hatzair active in the Warsaw revolt. She described her wanderings during the war with her small son. From the city of Lodz through devastated Warsaw they made their way to Bialystok, then under Soviet rule, where she met her brother Josef for the last time. Josef returned to Nazi-occupied Warsaw in order to coordinate the activities of the movement. Soon after the conquest of Bialystok by the Nazis in 1941, she lost her husband who was taken to work along with thousands of men, all of whom were shot. She continued her wanderings, supporting herself with various jobs. Sometimes she was hidden by Christians. Finally she joined the family camp of the Bielski brothers in the forests of Naliboki in western Belorussia. Most of Kaplan's story describes the camp and episodes of camp life, up to the liberation of the area by the Red Army in 1944.
The conical intersection in the collision of a Na(3p(2)P) atom with H-2, occurs at large H-H distances, Time dependent quantal computations exhibit many sequential non-adiabatic couplings, each of which is localized in time, where the quenching probability per traversal is small. During the collision, the population of the ground state increases almost in a random walk fashion until the partners recede after many H-2, vibrational periods. Changing the masses suggests that other systems can also exhibit such a snarled quenching process which cannot be described as a single non-adiabatic event per collision.
J.Yellin. 1997. “Neutron Activation Analysis.” In The Oxford Encyclopedia of Archaeology of the Near East, edited by Eric M. Meyer, Pp. 130. Oxford: Oxford University Press.
In the present work we describe the design, syntheses, and use of a new barium metalloorganic precursor for barium titanate thin film deposition. Barium-containing thin films deposited by different deposition methods are widely used for various applications in optics and electronics. An important goal for applications is concerned with the production of stable, fluorine free barium-metalloorganic precursor materials, to obtain better performance photonic devices. We describe an alternative barium-metalloorganic precursor based on a calixarene ligand, its application to dip coating and thin film growth of the BaO−TiO2 family of compounds, and studies of these films by second harmonic generation. The BaTiO3 films showed promising nonlinear optical response for guided wave-applications.
A classically motivated quantal method, designed to allow for molecular dynamics occurring on more than one potential-energy surface, is extended in two directions. The extensions are shown to be accurate while retaining the classical flavour which is useful for both interpretation and computation. The first extension allows for the evaluation of the required inter-state coupling matrix elements for potential-energy surfaces even when these are given numerically rather than fitted to some analytical form. Moreover, the procedure is a local one, requiring only the values of the two potentials and their gradients. It is thus particularly suitable for applications where the electronic and nuclear problems are solved simultaneously. The second extension strengthens the connections to classical mechanics while avoiding ambiguities in the choice of the classical trajectories which will represent the dynamics. The accuracy and limitations of the proposed procedures are tested for several model problems.
