Quantitative measurements in in situ straining experiments in transmission electron microscopy.

Several examples of recent studies by in situ straining experiments in a transmission electron microscope performed in the Toulouse group (France) are presented. In particular, quantitative measurements of the features of the dislocation motion are described. These examples deal with individual or collective propagation of dislocations, which are submitted to various types of obstacle.

Effect of genetic type, lactation and management on helminth infection of ewes in an intensive grazing system on irrigated pasture.

A survey of helminth infection was conducted in a flock of 290 ewes distributed into Romanov (R), Merinos d'Arles (M) and Romanov x Merinos (R x M) genetic types, grazing irrigated pasture in the south of France. Faecal egg and larval counts were done seven times per year from 1981 to 1984 on homogeneous groups of ewes and then individually once to four times every autumn from 1985 to 1988. Helminth fauna was diverse and more abundant during autumn.

Serological and allergic reactions of ewes after simultaneous vaccinations with two living attenuated strains of Brucella and Salmonella.

Four groups of 50 4-6-month old ewe-lambs were vaccinated with 1 or 2 living attenuated vaccines administered simultaneously. One hundred ewe-lambs received B melitensis strain REV 1 vaccine subcutaneously and 100 others received Rev 1 vaccine conjunctivally. In each group, 50 ewe-lambs simultaneously received the S abortusovis strain Rv6 vaccine via a contralateral subcutaneous route.

[Persistence of serologic and allergic reactions in ewes after vaccination with the H.38 or Rev.1 vaccines in a brucellosis (Brucella melitensis) enzootic area].

In a flock of 2,000 ewes located in an endemic area of Brucella melitensis infection, subjected to systematic vaccination of lambs either with killed and adjuvanted B. melitensis H.38 vaccine from 1973 to 1978, or with living B.