摘要:

AbstractA survey of published descriptions of bucephalid trematodes provides bits of information on definitive and intermediate hosts, life histories, developmental stages and systematic relations. Adults live in the digestive tracts of marine and freshwater fishes; miracidial larvae emerge from the eggs and enter bivalve mollusks, where they give rise to branched sporocysts in which fork‐tailed larvae are produced. These larvae, described by von Baer (1827), invade small fishes, where they encyst; when ingested by definitive hosts, they become sexually mature, completing the cycle. Although outlines of the life history are clear, correlation between larval and adult stages is known for only two marine and four freshwater species. Lack of information on successive stages of particular species has led to confusion in systematic and taxonomic determinations. The relative significance of different morphological and developmental features, especially of the excretory system, is controversial. A new genus,Rudolphinus, is erected to containProsorhynchus crucibulum(Rudolphi, 1819) Odhner, 1905, since the species is not congeneric withProsorhynchus squamatusOdhner, 1905, type of the genu

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01563.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractBuckling and initial postbuckling of an oval cylindrical shell under pure bending and under combined uniform axial compression and bending is investigated. The first‐ and second‐order stability equations are developed from the Donnell‐type equations that are shown to be appropriate. The solution of these two sets of equations determines, respectively, the buckling characteristics and a “sensitivity parameter.” The buckling loads are found to be in good agreement with the engineering approximation based on the assumption that buckling occurs when the local axial stress equals that corresponding to the classical buckling stress of a locally equivalent circular cylindrical shell under uniform axial compression. Results also show that an oval cylinder can be stronger or weaker than the equivalent circular cylinder, depending on the orientation of the couples. However, in any case the oval shell is always found to be sensitive to imperfections; the greater the load‐carrying capacity, the greater the sensitivity.Furthermore, in contrast to the behavior of the circular and weak oval cylinders, buckling of the strong oval cylinder need not initiate at the position of maximum compres

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01564.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractThis paper examines some of the disruptive effects of French colonialism on the traditional Moroccan society, specifically in terms of the male‐female relationship. By challenging the accepted cultural image of the male and undermining his protective functions towards the female, the French contributed to the normative dissonance of the society and exacerbated the existing sexual tensions. Moroccans complain about the inflated bride prices, marital instability, and prostitution, all of which are seen as indeces of the prevalent sexual role ambivalences and contradiction

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01565.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractThe carcinogenic activities of aromatic hydrocarbons correlate with electronic parameters ofKandLregions calculated by graph‐theoretical techniques based upon the simplest variation of valence‐bond theory (resonance theory limited to Kekule structures). The correlation coefficient between calculated and experimental carcinogenicity (Iball index) for ten well‐studied compounds is 0.94. Iball index values for 42 other compounds are calculated with results in satisfactory agreement with experiment. TheK, L‐region hypothesis is supported by the described

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01566.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractRecent work in linguistics has assumed that “surface” differences in syntax do not necessarily reflect differences in “deep” structure, i.e., there are differences in form without differences in meaning. But in many, perhaps in all, instances where the assumption has been adopted in practice, an unsuspected difference in meaning can be found. It is a safer working hypothesis that linguistic economy requires all differences in form to be correlated with differences in

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01567.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01568.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01569.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0028-7113    

DOI:10.1111/j.2164-0947.1974.tb01570.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY