Cultures of pig macrophages

Freshly collected blood from pigs was defibrinated with glass beads. The white cells were collected on a Ficoll-Hypaque mixture and grown in RPMI 1640 medium containing 20 per cent fetal calf serum. Monocytes adhered to the plastic or glass flasks and the erythrocytes and lymphocytes remained in suspension. The adherent cells assumed the appearance of macrophages and the mean cell size at eight days was 40 mum. Phagocytosis was demonstrated and, in the first few days, incorporation of tritiated thymidine occurred. Cells remained viable in culture for more than eight weeks. Histo-chemical studies and the appearance of the cells under the electron microscope are described.

CO(2) Laser Absorption Coefficients for Determining Ambient Levels of O(3), NH(3), and C(2)H(4)

A carbon dioxide laser source was used to determine absorption coefficients for dilute absorber-air mixtures at wavelengths corresponding to several vibration-rotation lines in each branch of the 00 degrees 1-02 degrees 0 band at 9.4 microm and the 00 degrees 1-10 degrees 0 band at 10.4 microm. For all samples the total pressure was 1 atm and the temperature was 300 K; the concentrations ranged from 10 ppm (parts per million by volume) to 357 ppm for NH(3) and C(2)H(4), and from 10 ppm to 80 ppm for O(3). The absorption coefficients are tabulated, and the use of selected laser lines in monitoring ambient concentrations is discussed.

Routine birth induction in rabbits using oxytocin

Using exogenous oxytocin to induce parturition newborn rabbits were obtained in an unfed condition at specific times to fulfil the requirements of a metabolic study, without the need for caesarian section. The technique was found to be very simple and reliable and extremely safe for both mother and offspring.

Siderotic Nodules (Gandy-Gamna Bodies) in Primary Renal Carcinoma

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