聚合质量比对Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19／PAn复合体系微波吸收性能的影响

用原位聚合法制备了Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19铁氧体／聚苯胺（PAn）复合材料。采用X射线衍射（XRD）、扫描电子显微镜（SEM）对样品的结构、微观表面形貌和粒子大小进行了表征,用微波矢量网络分析仪测量样品在2～12．4GHZ频率范围内复介电常数和复磁导率,根据测量数据计算微波反射率R与频率f的关系。研究结果表明：PAn包覆于掺杂锶铁氧体表面,PAn／Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19复合材料具有良好的吸波性能,随着掺杂锶铁氧体含量的增加,微波吸收匹配厚度和吸收带宽发生变化：当Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19聚合质量比为40％时,最佳匹配厚度为2．6mm,吸收峰值接近-40dB,峰值频率高于12．4GHz,大于10dB吸收带宽预计达到55GHz。     

Das Elektrovenogramm (Evg) der isolierten Flughautvene (Chiroptera)

Summary The electrovenogram of the isolated vein of the wing membrane (Chiroptera) exhibits two main irregularities in its diphasic action current—a fast initial wave before the beginning of the systole and a very protracted after-wave. Following this the rise and fall of potential run parallel with the contraction and dilatation of the vessels.     

In vitro cytostatic effect of adenine-arabinoside (Ara-A) and cytosine-arabinoside (Ara-C)

Summary Adenine-arabinoside, a new antiviral drug with questionable bone marrow toxicity, inhibits colony formation by myeloid precursor cells in vitro. Compared to cytosine-arabinoside this cytotoxicity is roughly one third.Supported by grants of the Swiss Cancer League (FOR 101.AK.77.2) and the Swiss Science Foundation (3.3320.74).Acknowledgments. We wish to thank Prof. A. Lévy for support in providing normal bone marrow samples and Miss Beatrice Rubin for skilled technical assistance.     

Characterization of tumor differentiation factor (TDF) and its receptor (TDF-R)

Tumor differentiation factor (TDF) is an under-investigated protein produced by the pituitary with no definitive function. TDF is secreted into the bloodstream and targets the breast and prostate, suggesting that it has an endocrine function. Initially, TDF was indirectly discovered based on the differentiation effect of alkaline pituitary extracts of the mammosomatotropic tumor MtTWlO on MTW9/PI rat mammary tumor cells. Years later, the cDNA clone responsible for this differentiation activity was isolated from a human pituitary cDNA library using expression cloning. The cDNA encoded a 108-amino-acid polypeptide that had differentiation activity on MCF7 breast cancer cells and on DU145 prostate cancer cells in vitro and in vivo. Recently, our group focused on identification of the TDF receptor (TDF-R). As potential TDF-R candidates, we identified the members of the Heat Shock 70-kDa family of proteins (HSP70) in both MCF7 and BT-549 human breast cancer cells (HBCC) and PC3, DU145, and LNCaP human prostate cancer cells (HPCC), but not in HeLa cells, NG108 neuroblastoma, or HDF-a and BLK CL.4 cells fibroblasts or fibroblast-like cells. Here we review the current advances on TDF, with particular focus on the structural investigation of its receptor and on its functional effects on breast and prostate cells.     

Effects of Si and Ce on the microstructure and hydrogen storage property of Ti_(26.5)Cr_(20)V_(45)Fe_(8.5)Ce_(0.5) alloy

In this paper,the effects of Si and Ce on the microstructure and hydrogen storage property of Ti26.5 Cr20V45Fe8.5Ce0.5 alloy were studied,respectively.First of all,effects of Si on the microstructure and hydrogen storage properties of Ti26.5Cr20(V45Fe8.5)1-xSixCe0.5(x=0,0.5,1.0,1.5 and 2.0 at%)alloys were studied by X-ray diffraction,scanning electron microscopy and P-C isotherm measurements.As the Si addition increases,the hydrogen absorption capacities of alloys decrease but the equilibrium pressure incre...     

Hashish VI1: Conversion of (-)-Δ 1(6)-Tetrahydrocannabinol to (-)-Δ 1(7)-Tetrahydrocannabinol. Stability of (-)-Δ 1 and (-)-Δ 1(6)-Tetrahydrocannabinols

Zusammenfassung Die Synthese von (—)-¹⁽⁷⁾-Tetrahydrocannabinol (THC) auf (—)-¹⁽⁶⁾ wird beschrieben. Das Hauptprodukt der oxidativen Zerstörung von (—)-¹-THC ist Cannabinol. Beschleunigte Versuche der Luftoxidation von (—)-¹-THC und (—)-¹⁽⁶⁾-THC haben gezeigt, dass das letztere beständiger ist. Dieser Unterschied kann mit der Reaktivität des C₃-benzylisch-allylischen Wasserstoffes in (—)-¹-THC erklärt werden.     

Infection of frog tadpoles (Amphibia) by insect parasitic nematodes (Rhabditida)

Summary Infective stage juveniles ofNeoaplectana carpocapsae (Steinernematidae) andHeterohabditis heliothidis (Heterorhabditidae) were able to penetrate through the alimentary tract of young tadpoles ofHyla regilla (Hylidae) andXenopus laevis (Pipidae) and enter the body cavity. Some infectives ofN. carpocapsae were able to release their symbiotic bacterium,Xenorhabdus nematophilus inside the host and in two cases, the nematodes developed into adult females before they perished. Tadpole mortality was associated with foreign bacteria entering the penetration holes made by the invading nematodes. The infective stage juveniles of both nematodes frequently encountered a host defense reaction upon reaching the tadpole's infective stage juveniles of both nematodes frequently encountered a host defense reaction upon reaching the tadpole's coelom.     

The action of Di-(p-chlorophenyl) trichloromethylcarbinol (DTMC) and Di-(p-chlorophenyl) trifluoromethylcarbinol on houseflies

Résumé L'action des carbinols di-(p-chlorophenyl) trifluorométhyl et di-(p-chlorophenyl) trichlorométhyl (DTMC) a été déterminée sur une souche très résistante de mouches par la méthode de contact. Le premier composé semble agir probablement grâce à de faibles propriétés fumigantes, alors que le second est toxique par contact. L'action toxique de ce dernier est sensiblement augmentée par l'addition du DDT, DDE ou autre composé organique de la série du DDT.

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Chemical development of DTMC.

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Biological evaluation.     

Amperometric studies on chromium (III) and iron (III) hydroxocyanotungstates (IV)

Zusammenfassung Die Zusammensetzung von in wässeriger Lösung gebildeten Ionenpaaren des Anions [W(CN)₄(OH)₄]^4- mit Cr³⁺ bzw. Fe³⁺ wird amperometrisch ermittelt.

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Acknowledgment. The authors are grateful to Dr.S. M. F. Rahman for providing necessary facilities and C.S.I.R. (India) for awarding a Junior Fellowship to one of them (K. U.).     

Sterols of the lobster (Homarus americanus) and the shrimp (Pandalus borealis)

Summary In this study we have analyzed the sterol compositions of two continental shelf species of crustacea, the lobster (Homarus americanus) and the shrimp (Pandalus borealis). Cholesterol was found to be the most abundant sterol in these two species with smaller amounts of desmosterol, 24-methylcholesterol, 24-ethylcholesterol, 24-methylenecholesterol and 22-dehydrocholesterol. Woods Hole Oceanographic Institution Contribution Number 3494. This work was supported by the Office of Sea Grant of the National Oceanic and Atmospheric Administration, U.S. Department of Commerce. Special thanks are extended to Ms.R. Beebe-Center, who was responsible for a large part of the isolation work described here.     

Serological relationships of frogs (Ranidae) and toads (Bufonidae)

Zusammenfassung Das Ergebnis der immunoelektrophoretischen Untersuchungen zeigt einen gewaltigen Unterschied in den serologischen Mustern der Frösche (Ranidae) und Kröten (Bufonidae). Die amerikanischen Vertreter der Ranidae und der Bufonidae haben sehr wenig gemeinsame Serumantigene. Der Mangel an gemeinsamen antigenischen Bestandteilen in ihren Serumproteinen weist sowohl auf eine frühe Evolutionstrennung des Frosches und der Kröte wie auch auf ein merkliches genetisches Auseinandergehen der zwei Stämme während der langen Zeitspanne isolierter Existenz hin.

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The work was supported by grant No. GM-11782 from the U.S. Public Health Service.     

Protective effect of N-(2-propynyl)-2-(5-benzyloxy-indolyl) methylamine (PF9601N) on mitochondrial permeability transition

PF9601N, N-(2-propynyl)-2-(5-benzyloxy-indolyl) methylamine, an monoamine oxidase (MAO) B inhibitor, has shown neuroprotective properties against dopaminergic toxins. To elucidate the mechanisms involved in this protection, the effect of PF9601N on mitochondria was assessed. PF9601N prevents mitochondrial swelling, drop in the electrical potential and oxidation of sulfhydryl groups, glutathione and pyridine nucleotides induced by Ca²⁺. These observations demonstrate the protective effect of PF9601N on the induction of mitochondrial permeability transition. This protection is due to the interaction of the secondary protonated amino group in the molecule with pore-forming structures and to its antioxidant property, rather than to inhibition of MAO B activity. PF9601N also prevents the release of cytochrome c from mitochondria, suggesting its potential inhibitory effect on mitochondria-mediated apoptosis. The low IC⁵⁰ value for this inhibition, in comparison with deprenyl, make it a more efficient compound than propargylamines and other amines in protecting the bioenergetic functions of mitochondria. Received 9 March 2006; received after revision 10 April 2006; accepted 21 April 2006     

Endocrine organs of different larval instars of Spodoptera (Prodenia) litura Fabricius (Lepidoptera: Noctuidae)

Summary A₁ and A₂ cells of the median neurosecretory group are filled with PF stained neurosecretory material between the first 24 to 48 h of the earlier moult in each instar followed by immediate release before the next moult at 72 h, while loaded posterior and lateral neurosecretory cells also appear from the 3rd and 5th instars onwards. Corpora cardiaca, corpora allata and prothoracic glands increase in size in each instar.     

Analyse des Paarungsrufes vonPelodytes punctatus (Daudin 1803) (Amphibia,Pelobatidae)

Summary The mating call of Pelodytes punctatus was analyzed by oscillograms and sonagrams. Above water surface, 2 types of call differing in several parameters are uttered in alternation. There is also a release call. The mating call, not uttered in series and consisting simply of uniform, short, noise-like sound pulses, seems rather undifferentiated compared with the Pelobatinae, a view supported by the more primitive habits ofPelodytes.