Clonal analysis of epidermal patterning during maize leaf development.

In plants, specialized epidermal cells are arranged in semiordered patterns. In grasses such as maize, stomata and other specialized cell types differentiate in linear patterns within the leaf epidermis. A variety of mechanisms have been proposed to direct patterns of epidermal cell differentiation.

Heterochronic effects of glossy15 mutations on epidermal cell identity in maize.

Vegetative development in maize is divided into a juvenile phase and an adult phase that differ in the expression of a large number of morphological, anatomical, and biochemical traits. Recessive mutations of Glossy15 cause a premature switch in the expression of some of these phase-specific traits. Mutant plants cease producing juvenile traits (e.

[Early return to work after arterial surgery and strict control of disabled patients].

Coronary surgery represents an increasing economic burden to society. This is aggravated a great deal by the fact that these patients do not return to work and are often placed in permanent postoperative disability. Comparative analysis of return-to-work rates after coronary by-pass, according to the social benefits system, clearly demonstrates the magnitude of the possible savings.

[The viewpoint of the dermatologist toward white atrophy].

Milian's white atrophy (1929), linked by English authors with livedoid vasculitis and segmentary hyaline vasculitis, is "the microvascular expression of diseases of variable aetiologies". It can be isolated, without vasculitis (idiopathic or secondary to an inflammatory livedo); the variety with vasculitis, most often observed, stems from loco-regional causes (above all from post-phlebitic venous hypertension) but also from general causes (collagenoses, infections, carcinamatoses). The need for an attempt at a better approach to white atrophy is clear.

[Post-concussion syndrome after cranio-cervical injuries. Apropos of a case].

The post-concussion of the brain syndrome is an often observed clinical entity. In this especially subjective syndrome, one new pathogenic approach seems very interesting for the clinical and therapeutic conclusions. This is one medical case reported for the proof of this hypothesis.