Leonardo da Vinci clearly observed and described capillaries. Using the microscope, Marcello Malpighi examined the brain and major organs to demonstrate their finer anatomical features. This led to his discovery in 1661, of capillaries that proved fundamental to our understanding of the vascular system in the brain and cord. He hypothesized that capillaries were the connection between arteries ...

SUMMARI The fluidity of blood in microcirculation is mainly determined by the micromechanical properties of its corpuscular components and its fluid, the plasma. Disorders in their rheological abilities lead to diminished perfusion of the microcir culation and cause a decrease in its nutritive function. Numerous measuring systems have been developed for diagnosing changed flow properties and es...

We present in this paper the implementation of an innovative three dimensional (3D) microfabrication technology coupled with numerical simulation to enhance the mass transport in 3D cell culture. The core of this microfabrication technology is a high-resolution projection micro stereolithography (PmicroSL) using a spatial light modulator as a dynamic mask which enables a parallel fabrication of...

Microangiopathy affects the peritubular capillaries in experimental diabetes. Five to six months after streptozotocin administration to induce experimental diabetes in rats, a progressive increase of lymph flow and of the entry of albumin from the renal peritubular capillaries into the interstitium was seen. Under these conditions, owing to the alteration of peritubular physical forces, the upt...

After several hours of ischemia an incomplete return of blood flow has been reported in brain, kidney, skeletal muscle, and heart. The mechanisms responsible for the no-reflow phenomenon have been unclear, and perivascular edema, platelet or red cell plugs, and interstitial hemorrhage have been implicated. In the present study evidence is provided that leukocyte entrapment in capillaries might ...

This paper presents the design and fabrication of an optical window for an optical modulator toward image sensing applications. An optical window consists of micrometer-order SiO2 capillaries (porous solid) that can modulate transmission light intensity by moving the liquid in and out of porous solid. A high optical transmittance of the optical window can be achieved due to refractive index mat...

The architectural changes which occur in the capillaries are difficult to illustrate without a three-dimensional tool, such as scanning electron microscopy. Therefore, a scanning electron microscopic study was occasionally undertaken to show the capillary changes of lung fibrosis. Fibrosis was induced in twenty rats by an intratracheal injection of bleomycin. After 30 days the rats were sacrifi...

four regions or stages in the life cycle of the odontoblast. The pulpal arteries in the differentiating dental papilla cell region and the pre-odontoblastic region immediately spread into capillaries towards the odontoblastic layer. The capillaries formed a network in the shape of polygonal meshes. The capillary wall appeared to be continuous. In the young odontoblastic region, the capillaries ...

Functional and ultrastructural studies of liposomes injected i.v. into inbred C57BL/6N mice were performed to determine whether free liposomes can traverse capillaries. In the liver and spleen, organs with discontinuous (sinusoidal) capillaries, ultrastructural and cell fractionation studies revealed that small (300- to 800-A diameter), sonicated, unilamellar liposomes were more efficient in pe...