Return to work after Post-COVID: describing affected employees' perceptions of personal resources, organizational offerings and care pathways.

Background: Most individuals recover from the acute phase of infection with the SARS-CoV-2 virus, however, some encounter prolonged effects, referred to as the Post-COVID syndrome. Evidence exists that such persistent symptoms can significantly impact patients' ability to return to work. This paper gives a comprehensive overview of different care pathways and resources, both personal and external, that aim to support Post-COVID patients during their work-life reintegration process.

Osteopetro-rickets: a new congenital bone disorder.

Two lethal mutations have been described in the rat: "osteopetrosis" (op) and "toothless" (tl). The op mutant can be cured by normal bone marrow infusion, while the tl mutant cannot. We report here additional data with regard to the tl mutant.

[Systematic study of the variations in mineral composition of different bones from various animals according to their localization].

X-ray diffraction techniques allow us to show that, in calcified tissues, phosphates resulting from a given formation process have the same ratio Ca/P for the bones at different subjects, providing these subjects are of the same kind and the same age. This ratio Ca/P depends on the bone formation process.

[Mineralization at the level of the calcified cartilage zone. Value and significance of the spicule of calcification].

The calcified cartilaginous spicule, generated in the zone of the calcified cartilage, is included in the primary metaphysis. It is generally admitted that the spicule had a homogeneous structure. Studies of structure and ultrastructure of the calcified spicule made the existence of two definitely different zones obvious: one at the periphery of the spicule, the other in the center.

[Kinetic, radiographic, and histologic demonstration of the curing of congenital osteopetrosis in rats].

In the "op" rat congenital osteopetrosis is a lethal condition. The management of this disease can be achieved by a single injection of a marrow cell suspension from a normal donor or by temporary parabiosis with a normal Rat, the latter procedure being less efficient than the former according to kinetic, roentgenographical and histological examinations.

[Formation of the skeleton. IX. Growth of a long bone: dynamics of diaphysial growth].

The diaphysis of a growing long bone is composed of three distinct parts: the bone periosteal collar and the two metaphyses. Each of these parts affects a separate radiographic, microradiographic and histologic appearance. By these means, it is possible to follow the growth and the increase of these parts and thus the relations which exist between them: all together they constitute the "dynamics of diaphyseal growth".

[Formation of the skeleton. VIII. Growth of a long bone: periostealization of the metaphysial bone].

The growth of the diaphysis of a long bone is manifested in three distinct constituent parts: the bone periosteal collar and, at both ends, the two metaphyses. These grow on the epiphyseal plate side and at the other end, they are integrated into the periosteal bone collar. This integration involves changes in the periosteal bone as well as in the fibro-cellular-layer which surrounds it.

[Formation of the skeleton - growth of a long bone. Growth of the 3d metatarsal bone in the rat].

The authors have studied the longitudinal growth of the third metatarsal bone of the rat. This bone has only one epiphyseal plate at its distal extremity and none at its proximal one. Nevertheless it was demonstrated that the proximal extremity was responsible for 16% of the total longitudinal bone growth.