Wesselsbron virus - a virus not previously described, associated with abortion in domestic animals

1. There has been isolated from a lamb a pantropic virus with neurotropic properties and a well-marked affinity for embryonic tissue. 2. In the field the vectors are mosquitoes which have yet to be identified accurately. 3. In sheep infection with the virus causes a febrile reaction after a short incubation period of about one to four days, the mortality rate not being high. Pregnant ewes may abort during the febrile reaction in which case virus could not be isolated from the foetuses. Subsequently the virus invades the foetus causing death usually with abortion. The mortality amongst foetuses carried to full term and new-born lambs is very high (practically 100%). New born lambs suckling reacting ewes did not become infected by contact with the reacting ewe. 4. In addition to sheep, cattle, horses, pigs, mice, rabbits, guinea-pigs and man are susceptible. 5. Infant and adult mice are equally susceptible to intracerebral inoculation, the mortality being 100%. Infant mice are fully susceptible to intraperitoneal infection but in adult mice the reaction is at most inapparent.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

Aureomycin in the treatment of heartwater

1. The value of aureomycin in the treatment of heartwater has been established. It is considerably more effective than the sulphonamides. 2. The minimal therapeutic dose for sheep appears to be 2•5 mg. per lb. administered intravenously either as a single dose or in divided doses at intervals of 24 hours. 3. Doses smaller than the curative dose have a marked effect upon the course of the disease. 4. In cattle even advanced cases have responded promptly to administration of 2 to 2•5 mg. per lb. It was possible that doses as small as 1 mg. per lb. were effective. 5. Administered in the incubation stage of the disease in amounts approximately double the curative dose it had a marked effect upon the subsequent course of the disease. 6. Prophylactic or curative administration in doses up to 20 mg. per lb. did not interfere with immunity production. 7. Aureomycin alone or in combination with a sulphonamide is suggested at present as the drug of choice for treatment, or together with live virus for immunization. This work was facilitated by the supply in very generous quantities of aureomycin hydrochloride with sodium glycinate by the Director, Lederle Laboratories, Pearl River, N.Y., U.S.A., to whom we wish to take this opportunity of expressing our indebtedness.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

The serological relationship of South African bovine enterovirus strains (Ecbo SA-I and-II) and the growth characteristics in cell culture of the prototype strain (Ecbo SA-I)

A locally isolated bovine enterovirus designated echovirus SA-I was found to belong to the Weybridge serotype 134. The growth characteristics of the virus in a number of cell types were studied. Its replicative cycle and its effect on the metabolism of the host cell, studied by means of isotope-labelling techniques, closely resemble those of other enteroviruses. It was shown that the inhibitors of cellular RNA and protein synthesis are produced normally even if replication of the infecting virus is blocked by guanidine.The journals have been scanned in colour with a HP 5590 scanner; 600 dpi. Adobe Acrobat v.11 was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

Classical trajectories in quantum transport at the band center of bipartite lattices with or without vacancies

Here we report on several anomalies in quantum transport at the band center of a bipartite lattice with vacancies that are surely due to its chiral symmetry, namely: no weak localization effect shows up, and, when leads have a single channel the transmission is either one or zero. We propose that these are a consequence of both the chiral symmetry and the large number of states at the band center. The probability amplitude associated to the eigenstate that gives unit transmission ressembles a classical trajectory both with or without vacancies. The large number of states allows to build up trajectories that elude the blocking vacancies explaining the absence of weak localization.Comment: 5 pages, 5 figure

Weak-Localization in Chaotic Versus Non-Chaotic Cavities: A Striking Difference in the Line Shape

We report experimental evidence that chaotic and non-chaotic scattering through ballistic cavities display distinct signatures in quantum transport. In the case of non-chaotic cavities, we observe a linear decrease in the average resistance with magnetic field which contrasts markedly with a Lorentzian behavior for a chaotic cavity. This difference in line-shape of the weak-localization peak is related to the differing distribution of areas enclosed by electron trajectories. In addition, periodic oscillations are observed which are probably associated with the Aharonov-Bohm effect through a periodic orbit within the cavities.Comment: 4 pages revtex + 4 figures on request; amc.hub.94.

Surgical Aspects of Dissecting Aortic Aneurysms

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66511/2/10.1177_000331975400500313.pd

Edge magnetoplasmons in periodically modulated structures

We present a microscopic treatment of edge magnetoplasmons (EMP's) within the random-phase approximation for strong magnetic fields, low temperatures, and filling factor $\nu =1(2)$, when a weak short-period superlattice potential is imposed along the Hall bar. The modulation potential modifies both the spatial structure and the dispersion relation of the fundamental EMP and leads to the appearance of a novel gapless mode of the fundamental EMP. For sufficiently weak modulation strengths the phase velocity of this novel mode is almost the same as the group velocity of the edge states but it should be quite smaller for stronger modulation. We discuss in detail the spatial structure of the charge density of the renormalized and the novel fundamental EMP's.Comment: 8 pages, 4 figure

AVALIAÇÃO HISTOPATOLÓGICA, HORMONAL E BACTERIOLÓGICA DA PIOMETRA NA CADELA

O presente estudo teve como objetivo analisar os níveis hormonais, as alterações histopatológicas e os agentes etiológicos encontrados na piometra aberta e fechada em cadelas. Foram colhidas 30 amostras de fêmeas ovariohisterectomizadas em clínicas veterinárias da cidade de Curitiba, no Estado do Paraná, no período de outubro de 2002 a maio de 2003. Procedeu-se a exames bacteriológicos, análises histopatológicas dos cornos uterinos e dosagem hormonal da progesterona e do estradiol pela quimioluminescência. A bactéria isolada em maior porcentagem (36%) foi a Escherichia coli, e a alteração histológica de hiperplasia cística endometrial encontrada variou do grau I ao grau III. A proporção entre a progesterona e estradiol teve uma variação significativa nos dois tipos de piometra, porém não foi possível relacionar o agente etiológico, o tipo de lesão e a dosagem hormonal com o tipo de piometra, aberta ou fechada. Histopathological, hormonal, bacterial evaluation in the bitch pyometra Abstract The aim of the present study was to carry out an evaluation of the hormone levels, the histological changes and the etiological agents found in the open and closed pyometra. The uterine horns were collected from 30 bitches subjected to ovariectomy in different veterinary clinics from Curitiba, State of Parana, during the period of October 2002 to May, 2003. Bacteriological cultures, histological analysis and assays of progesterone and estradiol by the chemoluminescent method were performed. Escherichia coli showed to be the most frequent (36%) of the isolated bateria. It has been found the histological analysis that cystic endometrial hyperplasia varied from type I to type III. The progesterone/ estradiol ratio showed a significant variation in regard to the two types of piometra. However, it was not possible to corrrelate the etiological agent, the lesion and the hormonal levels with the open or closed pyometra

Quantum central limit theorem for continuous-time quantum walks on odd graphs in quantum probability theory

The method of the quantum probability theory only requires simple structural data of graph and allows us to avoid a heavy combinational argument often necessary to obtain full description of spectrum of the adjacency matrix. In the present paper, by using the idea of calculation of the probability amplitudes for continuous-time quantum walk in terms of the quantum probability theory, we investigate quantum central limit theorem for continuous-time quantum walks on odd graphs.Comment: 19 page, 1 figure