A wall/plasma membrane unit was prepared from Hydrodictyon africanum by microdissection. A replica of the inner surface of the membrane was made and by freeze-fracture of the whole cell, 2 corresponding internal fracture faces were obtained. The large coenocytes of the alga were plasmolysed and the wall separated by cutting it away. Its inner surface was directly viewed in the electron microsco...

A careful examination of a dynamic mode I crack problem leads to the conclusion that the commonly used boundary conditions do not always hold in the case of an applied crack face loading, so that a modification is required to satisfy the equations. In particular, a transient compressive stress wave travels along the crack faces, moving outward from the loading region on the crack face. This doe...

The effect of the local anesthetic dibucaine on the membrane ultrastructure of sterol-manipulated Tetrahymena pyriformis (NT-1 strain) was studied by freeze-fracture electron microscopy. Dibucaine-treated, ergosterol-replaced Tetrahymena cells had marked alterations in their plasma membranes. IMP-free small depressions (exoplasmic fracture face) and protrusions (protoplasmic fracture face) were...

Traumatic injuries of the face often involve root fractures especially in anterior teeth. The prognosis and the treatment of the root fracture depend on the extent of the fracture line, general health and patient compliance. This case report outlines a new conservative trial treatment modality to stabilize the maxillary central incisors with horizontal root fracture on the cervical to middle th...

Un patient de 22 ans se présente aux urgences pour une impotence fonctionnelle douloureuse et immédiate du pied gauche suite à un accident de la voie publique. L'examen clinique montre une vive douleur du tiers inférieur de la jambe, avec une cheville oedématiée sans ouverture cutanée. Les diagnostics à évoquer sont une fracture bimalléolaire ou une fracture du quart distale de jambe. Le bilan ...

The management of post-traumatic cerebrospinal fluid (CSF) leak in the context of facial bone fracture remains a surgical challenge. The complexity increases in those cases of concurrent traumatic brain injury and craniofacial fractures. The optimal timing for facial bone fracture repair is still controversial in traumatic CSF leak patients [1]. An unrestrained, non-helmeted 14-year-old female ...

The deflection and fracture of metal sandwich plates subjected to intense uniform impulsive pressure loads are studied for plates made of four steels representing a wide range of strength, strain hardening and ductility. Sandwich plates with both square honeycomb cores and folded plate cores are considered. The primary fracture modes of the sandwich plates are necking and subsequent tearing of ...

We report flow-through experiments on a natural fracture in novaculite under moderate effective stresses (∼1.4 MPa) and temperatures (20–120 °C) to examine the effect on flow and transport characteristics. The efflux of fluid and dissolved minerals were measured throughout the 3150-h experiment. After the experiment the fracture was imaged by X-ray CT, impregnated with Wood's metal, and a cast ...

DESCRIPTION A 20-year-old man with a previous gunshot to the left mandible presented with left facial swelling and trismus after being assaulted in the face with a closed fist. Mouth opening from maxillary to mandibular central incisors was limited to 3 cm. Dedicated maxillomandibular computed tomographic (CT) scan demonstrated an isolated left zygomatic arch fracture impinging the coronoid of ...

A comparative study of polypeptide composition and freeze-fracture morphology of chloroplast membranes isolated from different, but photosynthetically active, regions of a romaine lettuce shoot is presented. Chloroplasts prepared from outer dark-green leaves possess a fully developed light-harvesting chlorophyll-protein complex, have low chlorophyll a:b ratios and display fracture faces similar...