SuperDense Quantum Teleportation

Recent advances in experimental technique make SuperDense Teleportation (SDT) possible only now, ten years after my first proposal at an ISI Torino summer conference on Quantum Computing. The effect uses remote state preparation to send more state-specifying parameters per bit than ordinary quantum teleportation (QT) can transmit. The SDT uses a maximally entangled state to teleport the relative phases of an n-dimensional state with equal amplitudes on every standard basis vector. For n greater than or equal to 3, the SDT sends more of these state-specifying parameters than QT. In the limit of large n the ratio is 2 to 1, hence the nomenclature by analogy with Super Dense Coding. Alice’s measurements and Bob’s transformations are far simpler than their corresponding operations in QT. The roles of Charles who chooses the state and Diana who deploys it are different than in QT. My discussion includes a brief review of the progress and possibilities of realization for several different experimental approaches around the world. This paper is the write-up of my remarks at the Festschrift conference for Anton Zeilinger, for many years a close collaborator in the Hampshire College NSF grant continuing our work with Mike Horne and Danny Greenberger started under Cliff Shull at MIT in the late 20th century.     

Design and structural applications of stress-crack width relations in fibre reinforced concrete

The stress-crack width relationship has been shown to be the key to an understanding of fracture propagation in and mechanical behaviour in tension of fibre reinforced concrete materials and structures. A model is derived for the stress-crack width relationship for randomly oriented short fibre composites which takes hybrid fibre systems and possible fibre rupture into account. It is shown how this stress-crack width relationship can be included in a structural model for the prediction of crack widths in reinforced concrete structures. With this combination of models a rational design tool for the design of composite materials and structures has been established. It is shown how different fibre systems can be tested for structural applicability and how combined material and structural optimization can take place.     

Poetry I: Teaching verse with CAI

The teaching of literature through CAI raises problems of both a linguistic and instructional nature; student involvement and creativity in studying literature, and especially poetry, is difficult to build into a computer-based lesson. We have confronted these difficulties in the lessonPoetry I, which introduces undergraduates to basic concepts of poetic verse in a design using screen display, speech synthesis, and verse processing to maximize interactivity and student involvement.The lesson contains instructional modules which include the student's composition of a limerick. Computational processing of the limerick's text enables the program to offer guidance as the student composes and revises the verse and gains first-hand experience with metrical language. The significant problems inherent in processing verse are addressed by adapting Digital Equipment Corporation's DECTalk speech synthesizer as an engine converting natural language verse text into accessible strings of phonemic symbols. Although the verse processor cannot scan verse, it can interpret DECTalk's symbols reliably enough to successfully stimulate students' thinking about their verse compositions.Preliminary responses to the program have been favorable and demonstrate its effectiveness in involving students more deeply in learning about poetic verse. This suggests that the techniques of verse processing prototyped inPoetry I might be usefully extended to other types of verse and levels of study.W. Webster Newbold is an Assistant Professor of English at Ball State University, Muncie, Indiana, USA, who has recently served as English Department Computer Coordinator. His research interests include computer-assisted instruction and computer-based composition.Herbert F. W Stahlke is a Professor of English, specializing in linguistics, and currently serves as Associate Director for Academic Computing, Ball State University Computing Services. His research interests include computer-assisted instruction, natural language processing, and lexical databases.     

A functional programming approach to the specification and verification of concurrent systems

Networks of communicating processes can be viewed as networks of stream transformers and programmed in a lazy functional language. Thus the correctness of concurrent systems can be reduced to the correctness of functional programs. In this paper such correctness is proved formally in the-calculus extended with recursion equations for functional programs. The-calculus is chosen since it allows the definition of properties by least fixed points (induction) as well as by greatest fixed points (coinduction), and since greatest fixed points are useful for formalising properties, such as fairness, of infinitely proceeding programs. Moreover, non-deterministic processes are represented as incompletely specified deterministic processes, that is, as properties of stream transformers. This method is illustrated by proving the correctness of the alternating bit protocol.     

Isolation and enzymatic fragmentation of the coeliac-active gliadin peptide CT-1

Summary Investigations on the structure/toxicity relationships of gliadin peptides were continued with the coeliac-active gliadin peptide CT-1, which is derived from the N-terminal portion (residues 3–24 of the amino acid sequence) of-gliadins [this journal (1986) 182:115–117]. CT-1 was produced by chymotryptic digestion and reversed-phase (RP) HPLC from the peptide fraction G3 [this journal (1992) 194:1–6] and digested with the proteases endoproteinase Glu-C, pancreatin, papain and thermolysin. The fragment peptids were separated by preparative RP-HPLC and characterized by amino acid analysis. On the basis of the specifity of the enzymes for CT-1 and the toxic effect of enzymatic hydrolysates of gliadin described in the literature, the significance of partial sequences, in particular of the sequence -Pro-Ser-Gln-Gln-Gln-Pro- for the coeliac-toxicity effect, is discussed.

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Isolierung und enzymatische Fragmentierung des coeliakieaktiven Gliadinpeptids CT-1

Zusammenfassung Die Untersuchungen über die Zusammenhänge zwischen der Struktur von Gliadinpeptiden und ihrer Toxizität wurden mit dem coeliakieaktiven Gliadinpeptid CT-1 fortgesetzt, das aus dem N-terminalen Bereich (Positionen 3–24 der Aminosäuresequenz) von-Gliadinen stammt [diese Zeitschrift (1986) 182:115–117]. CT-1 wurde aus der Peptidfraktion G3 [diese Zeitschrift (1992) 194:1–6] durch chymotryptische Partialhydrolyse und Umkehrphasen-HPLC gewonnen und mit den Proteasen Endoproteinase Glu-C, Pankreatin, Papain und Thermolysin umgesetzt. Die entstandenen Fragmentpeptide wurden durch präparative Umkehrphasen-HPLC getrennt und durch Aminosäurenanalyse charakterisiert. Anhand der Spezifität der Enzyme gegenüber CT-1 und der aus der Literatur bekannten toxischen Wirkung von enzymatischen Gliadinhydrolysaten wird die Bedeutung einzelner Sequenzabschnitte, insbesondere der Sequenz-Pro-Ser-Gln-Gln-Gln-Pro-, für die coeliakiespezifische Wirkung diskutiert.

     

Coeliac activity of the gliadin peptides CT-1 and CT-2

Summary The coeliac active peptide B 3142, which has been isolated from a peptic-tryptic digest of gliadin [1] and which consists of 53 amino-acid sequences [2], was partially hydrolyzed with -chymotrypsin. The two fragment peptides CT-1 (positions 1–22 of B 3142) and CT-2 (positions 23–53) were separated by high-performance liquid chromatography on octadecyl silica gel and purified by gel filtration on Biogel P2. The examination in the organ-culture test including 18 coeliac patients on normal diet and 7 control persons have shown that the toxicity is preserved after the chymotryptic treatment and that the peptides B 3142, CT-1 and CT-2 do not significantly differ from one another according to their coeliac-specific effect.

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Coeliakieaktivitat der Gliadinpeptide CT-1 und CT-2

Zusammenfassung Das coeliakieaktive Peptid B 3142, das aus einem peptisch-tryptischen Partialhydrolysat von Gliadin gewonnen wurde [1] und aus einer Sequenz von 53 Aminosäureresten besteht [2], wurde mit -Chymotrypsin partiell hydrolysiert. Die beiden Fragment-peptide CT-1 (Positionen 1–22 von B 3142) und CT-2 (Positionen 23–53) wurden durch Hochdruckflüssig-keitschromatographie an Octadecyl-Kieselgel aufgetrennt und an Biogel P2 gereinigt. Die Prüfung im Organkultur-Test unter Einbeziehung von 18 Coeliakie-patienten unter Normalkost und von 7 Kontrollpersonen zeigte, daß die Toxizität nach chymotryptischer Spaltung erhalten bleibt, und daß sich die Peptide B 3142, CT-1 und CT-2 in ihrer coeliakiespezifischen Wirkung nicht wesentlich unterscheiden.

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Supported by a grant from Deutsche Forschungsgemeinschaft. We gratefully acknowledge the excellent assistance given by Mrs. U. Schützler and Ms. B. Mosler     

Selective sterol transfer in the honey bee: Its significance and relationship to other hymenoptera

The honey bee,Apis mellifera, is one of only a few species of phytophagous insects known to be unable to convert C-24 alkyl phytosterols to cholesterol. Regardless of the dietary sterols available to worker bees, the major tissue sterol of brood reared by the workers is always 24-methylenecholesterol, followed by sitosterol and isofucosterol. Normally, little or no cholesterol is present in honey bee sterols. The maintenance of high levels of certain sterols is accomplished through a selective transfer of sterols from the endogenous sterol pools of the workers to the developing larvae through the brood food material secreted from the hypopharyngeal and mandibular glands and/or the honey stomach of the workers. The selective uptake and transfer of radiolabeled C₂₇, C₂₈ and C₂₉ sterols have been studied to correlate these aspects of sterol utilization with the discovery of an unusual molting hormone (ecdysteroid) in honey bee pupae as the major ecdysteroid of this stage of development. The phylogenetic implications of this selective transfer phenomenon in the honey bee and comparison with sterol metabolism in certain other hymenopteran species emphasize the diversity of steroid biochemistry in insects.     

A rapid method for the preparation of ganglioside Glac2 (GD3)

A method is described for the preparation of ganglioside G_lac2 [(II³(NeuAc)₂-LacCer, GD3] from cream of bovine milk using liquid-phase extraction with methanol or ethanol followed by anion exchange chromatography. The method is rapid and inexpensive; 1 kg cream, centrifuged from 14–15 L of bovine milk, yields approximately 70 mg of pure ganglioside G_lac2. The sialic acid constituent of ganglioside G_lac2 isolated from bovine milk cream consists solely of theN-acetylneuraminic acid derivative. The major components of its ceramide consist of octadecasphing-4-enine and the 22∶0 (behenic acid) and 23∶0 fatty acids. Short hand notations for gangliosides are according to Wiegandt (Ref. 1). G_lac2, (II³(NeuAc)₂-LacCer) is NeuAcα,8NeuAcα,-3Galβ,4Glcβ,1Cer; G_tet1, (II³NeuAc-Gg₄Cer) is Gal\,3GalNAcβ,-4(NeuAcα,3)Galβ,4Glcβ,1Cer.     

Improvement of Crystallinity of KZr2P3O12 by Sol-Gel Synthesis

The X-ray diffraction pattern for potassium-zirconium phosphate is significantly improved when the material is prepared by the sol-gel route rather than the powder method. Peaks at high, low, and intermediate angles are presented and compared for the two methods. It is assumed that the more nearly homogeneous mixing of the elements in the sol-gel process is responsible for the significant improvement in crystallinity.     

Open annotations on multimedia Web resources

Many Web portals allow users to associate additional information with existing multimedia resources such as images, audio, and video. However, these portals are usually closed systems and user-generated annotations are almost always kept locked up and remain inaccessible to the Web of Data. We believe that an important step to take is the integration of multimedia annotations and the Linked Data principles. We present the current state of the Open Annotation Model, explain our design rationale, and describe how the model can represent user annotations on multimedia Web resources. Applying this model in Web portals and devices, which support user annotations, should allow clients to easily publish and consume, thus exchange annotations on multimedia Web resources via common Web standards.