[Dynamic mesh of carpal scaphoid].

Despite the use of cannulated compression screws, it is still difficult to screw non-displaced fractures of the scaphoid percutaneously. That is due in particular to the difficulty in assessing the correct position for the guide pin from the 2D fluoroscopic images. This work is designed to enable 3D visualisation of the scaphoid during surgical operations by using the technique of dynamic meshing and having the image appearing on a computer screen rather than as a mental image.

Modelling the mitotic apparatus. From the discovery of the bipolar spindle to modern concepts.

This bibliographical review of the modelling of the mitotic apparatus covers a period of one hundred and twenty years, from the discovery of the bipolar mitotic spindle up to the present day. Without attempting to be fully comprehensive, it will describe the evolution of the main ideas that have left their mark on a century of experimental and theoretical research. Fol and Bütschli's first writings date back to 1873, at a time when Schleiden and Schwann's cell theory was rapidly gaining ground throughout Germany.

Expression of Engineered Nuclear Male Sterility in Brassica napus (Genetics, Morphology, Cytology, and Sensitivity to Temperature).

A dominant genetic male sterility trait obtained through transformation in rapeseed (Brassica napus) was studied in the progenies of 11 transformed plants. The gene conferring the male sterility consists of a ribonuclease gene under the control of a tapetum-specific promoter. Two ribonuclease genes, RNase T1 and barnase, were used.

Expression of ogu cytoplasmic male sterility in cybrids of Brassica napus.

A light and electron microscopic investigation revealed that ogu cytoplasmic male sterility (CMS) in cybrids of Brassica napus is primarily a deficiency of the tapetum and clearly time and site specific. Three patterns of ogu CMS were found, and specific conclusions drawn. First, the partially male fertile cybrid 23 was highly variable.

Sleep disturbances in man during different compression profiles up to 62 bars in helium-oxygen mixture.

Studies of sleep organization of 8 subjects were performed during 4 dives between 500 and 610 msw (51 and 62 bar) in a helium-oxygen mixture. The results of the 156 sleep records showed that sleep was disrupted from 30 bar: awake periods and stages I and II increased, stages III and IV and REM periods decreased. These disturbances, which were more intense with fast compression and recovered during decompression, can be considered as further symptoms of the high pressure nervous syndrome (HPNS).

Accumulation of smooth cisternae in the tapetal cells of Ulex europaeus L. (Papilionoideae).

In addition to the events occurring in the tapetal cells of most angiosperm species (cell wall lysis, endoplasmic reticulum development and sporopollenin deposition on the outer face of the cells) the tapetum of Ulex europaeus L. exhibits two characteristics. No orbicules, generally associated with the locular face of the secretory tapetum of angiosperms, are found, but some intracellular macro-orbicules are formed and then released in the anther loculus.

Synthesis of the intranuclear crystals in Scolopendrium vulgare (L.) SM : An autoradiographic study.

Proteinaceous intranuclear crystals are found in the fern Scolopendrium vulgare. During mitosis these crystals are eliminated from the nucleus into the cytoplasm, where they are dissolved. New crystals appear in the nucleus.