نتایج جستجو برای: culture contact
تعداد نتایج: 434277 فیلتر نتایج به سال:
When a spherical muscle cell (myoball) was manipulated into contact with either the soma or the neurite of an isolated neuron in 2-day-old Xenopus nerve-muscle cultures, depolarizations similar to miniature endplate potentials (MEPPs) were frequently detected in the muscle cell. These depolarizations occurred within minutes after myoball-soma contact and within seconds after myoball-neurite con...
The high mortality of melanoma is caused by rapid spread of cancer cells, which occurs unusually early in tumour evolution. Unlike most solid tumours, thickness rather than cytological markers or differentiation is the best guide to metastatic potential. Multiple stimuli that drive melanoma cell migration have been described, but it is not clear which are responsible for invasion, nor if chemot...
Contact inhibition of growth (density-dependent regula tion) is a form ofm vitro growth control, the loss of which is correlated with in vivo tumorigenicity. A diffusible factor prepared from culture medium of a contact-inhibited line of hamster melanocytes has previously been found to restore the capacity for contact inhibition of growth to malignant melanocytes of man, mouse, and hamster, whi...
Hospitals in the United States are under increasing pressure to perform active surveillance cultures for detection of methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE) among newly admitted patients. Results of such cultures can then be used to direct contact precautions to prevent transmission of MRSA and VRE in the health care setting. However, using...
théoriquement, lenseignement constitue, dans la relation didactique, un pôle symétrique à celui de lapprentissage. du point de vue du curriculum, lenseignement est généralement caractérisé comme le moyen par lequel le curriculum est mis en oeuvre. les progrès dans les connaissances psychologiques sur les phénomènes dappropriation ont montré quun savoir est véritablement approprié, cest-à-d...
We have studied the morphology of embryonic chick retinal and sympathetic growth cones as they meet retinal and sympathetic neurites grown in culture. Growth cones preserve their normal morphology and ability to locomote when retinal growth cones contact retinal neurites or when sympathetic growth cones contact sympathetic neurites. Growth cones collapse and their motility ceases when retinal g...
Eph receptor and ephrin signalling has a major role in cell segregation and border formation, and may act through regulation of cell adhesion, repulsion or tension. To elucidate roles of cell repulsion and adhesion, we combined experiments in cell culture assays with quantitations of cell behaviour which are used in computer simulations. Cells expressing EphB2, or kinase-inactive EphB2 (kiEphB2...
The concept of contact inhibition of locomotion (CIL) describes the ability of a cell to change the direction of its movement after contact with another cell. It has been shown to be responsible for physiological and developmental processes such as wound healing, macrophage dispersion and neural crest cell migration; whereas its loss facilitates cancer cell invasion and metastatic dissemination...
A 65-year-old Japanese man was admitted with a 4-month history of fatigue and exertional dyspnea. Transthoracic echocardiography revealed a vegetation on the aortic valve and severe aortic regurgitation. Accordingly, infective endocarditis and heart failure were diagnosed. Although a blood culture was negative on day 7 after admission, a prolonged blood culture with subculture was performed acc...
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