X-ray diffaction evidence for nonstoichiometric rubidium-c60 intercalation compounds

Powder x-ray diffraction at 300 K on equilibrated samples of several nominal compositions chi in Rb(chi)C(60) is reported. In addition to the face-centered cubic (fcc) (chi = 3, superconducting), body-centered tetragonal (chi = 4), and body-centered cubic (bcc) (chi = 6) stoichiometric phases, direct evidence for a dilute fcc doped phase, 0 x c 相似文献   

Angiotensin-sodium interaction in blood pressure maintenance of renal hypertensive and normotensive rats

A specific inhibitor of angiotensin II was used in rats to investigate whether angiotensin is involved in the maintenance of blood pressure in one-kidney Goldblatt hypertension, in which plasma renin levels are not usually increased. The inhibitor produced marked falls in blood pressure, often down to normal levels in the hypertensive animals only when they were depleted in sodium and not after sodium repletion. Much lesser but still significant falls in blood pressure were also produced in normotensive sodium-depleted rats but not in repleted rats. We conclude that the importance of angiotensin for maintaining blood pressure is largely determined by its relation to available sodium or fluid volume, since the renin component in maintenance of either the hypertensive or the normotensive state could be exposed only by sodium deprivation. Therefore, volume expansion per se or other pressor factors may be involved in maintaining blood pressure of these sodium-replete normotensive or hypertensive animals.     

Widespread complex flow in the interior of the antarctic ice sheet

It has been suggested that as much as 90% of the discharge from the Antarctic Ice Sheet is drained through a small number of fast-moving ice streams and outlet glaciers fed by relatively stable and inactive catchment areas. Here, evidence obtained from balance velocity estimates suggests that each major drainage basin is fed by complex systems of tributaries that penetrate up to 1000 kilometers from the grounding line into the interior of the ice sheet. This finding has important consequences for the modeled or estimated dynamic response time of past and present ice sheets to climate forcing.     

Use of contrast radiography in the investigation of tenosynovitis and bursitis in horses

Contrast radiography, using a 25 per cent solution of sodium diatrizoate, has been used for the investigation of tenosynovitis and bursitis in horses. The procedure was undertaken on a series of 32 clinical cases and on specimens obtained at autopsy. Lesions affecting the extensor tendon sheaths at the carpus, the digital sheath, the tarsal sheath and the bursae at the elbow, hock and fetlock were examined by this means. The results showed the procedure offered the clinician useful information about the nature of the interior of these structures, particularly as regards the presence of adhesions and anastomoses between adjacent sheaths and joint capsules. Together with other clinical and laboratory findings, contrast radiography can assist in assessing the prognosis and in formulating appropriate treatment.     

Rhabdias kongmongthaensis sp. n. (Nematoda: Rhabdiasidae) from Polypedates leucomystax (Amphibia: Anura: Rhacophoridae) in Thailand

Rhabdias kongmongthaensis sp. n. is described based on specimens found in the lungs of the tree frog Polypedates leucomystax (Gravenhorst) (Amphibia: Rhacophoridae) from Kanchanaburi Province, western Thailand. The new species is similar to two North-American species, Rhabdias ranae and R. americanus, by presence of two lateral pseudolabia, each with two inner submedian protuberances. R. kongmongthaensis differs from both species by relative length and shape of the tail, and by its distribution and host specificity. Presence of lateral pseudolabia distinguishes the new species from the geographically closest Rhabdias species as well as from those parasitizing other rhacophorid frogs.     

Surgical remodelling of the femoral trochlea: an experimental study.

Surgical deepening of the groove in the femoral trochlea is a technique commonly employed in the correction of patellar dislocation in dogs. In order to discover how this deep articular defect repairs the operation was studied experimentally in young goats. Observations were made on the appearance of the trochlea and the histologic changes that had taken place after approximately six, 12, and 40 weeks. The abraded groove became filled with fibrocartilage with a relatively smooth surface and it articulated freely with the patella. The majority of the replacement tissues arose by differentiation of the granulation tissue which initially filled the groove, but there appeared to have been some contribution made by the hyaline cartilage at the margins of the groove.     

Attempts to transferRubus andFragaria viruses into herbaceous hosts

Attempts were made to transfer several types of viruses affectingRubus andFragaria species to herbaceous hosts of low tannin content. Despite use of phosphate buffers, nicotine sulphate solutions, and various lyophilization techniques, all inoculations were unsuccessful.Samenvatting Er werden pogingen ondernomen, verschillende typen van mozaïekvirussen van framboos en van aardbei met sap op kruidachtige, weinig of geen looistoffen bevattende planten over te brengen. Er werd gebruik gemaakt van fosfaatbuffers, van oplossingen van nicotinesulfaat en van droogvries-methoden vooraf de looistoffen uit het materiaal te verwijderen. De resultaten van de inoculatieproeven waren echter alle negatief.

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Research carried on at the Instiuut voor Plantenziektenkundig Onderzoek, Wageningen, Nederland. Supported in part by a fellowship from the John Simon Guggenheim Memorial Foundation, New York.

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Technical Paper No. 944 of the Oregon Agricultural Experiment Station. Contribution of the Department of Botany and Plant Pathology of this Station, and of the Instituut voor Plantenziektenkundig Onderzoek (I.P.G.), Wageningen.