We investigate dark-field imaging in the terahertz (THz) fre-quency regime with the intention to enhance image contrast through the analysis of scattering and diffraction signatures. A gold-on-TPX test structure and an archived biomedical tissue sample are examined in conventional and dark-field transmission geometry. In particular, the capability of the technique for tumor detection is addressed.

quency motions, the so called "essential" degrees of freedom [1, 2], which typically appear in timescales of nanoseconds to microseconds and play important roles in signalling, activation and enzyme function. Despite the rapid growth of computer power these timescales are not accessible with current molecular dynamic simulations systems. The CONCOORD system attempts to alleviate this sampling p...

LSI78Y mouse lymphoblastic leukemia cells normally require asparagine (ASN) for growth, but phenotypically stable ASN-independent cells are detectable at low fre quency by direct cloning, in ASN-free soft-agar medium, of cells from cultures that have been grown nonselectively in medium containing ASN. The rate of mutation in vitro to ASN independence was determined by the Luria-Delbruck fluctua...

LSI78Y mouse lymphoblastic leukemia cells normally require asparagine (ASN) for growth, but phenotypically stable ASN-independent cells are detectable at low fre quency by direct cloning, in ASN-free soft-agar medium, of cells from cultures that have been grown nonselectively in medium containing ASN. The rate of mutation in vitro to ASN independence was determined by the Luria-Delbruck fluctua...

s 290 behavioral research reports in the field of special education. Discusses cognitive thinking, sensory disorders, cer­ ebral dysfunctions, orthopedic and special health problems, speech and language im­ pairments, emotional disturbance, delin­ quency, and administration of special ed­ ucation. 4. Luria, A. R. (editor). The Mentally Retarded Child. New York: Macmil­ lan, 1963. Pp. 208. A ser...

Theories as to the etiology of amblyopia (also called amblyopia ex anopsia, strabis­ mus amblyopia, and amblyopia without ophthalmoscopic signs) may roughly be divided into two groups depending upon whether the primary defect is postulated in the cere­ bral cortex or in the retina. Wald and Burian who are among the most lucid ad­ vocates of the former position described measurements on five cas...

Cultured hepatocytes from adult Fischer 344 rats were transformed by virion or cloned simian virus 40 (SV40) DNA using the calcium phosphate method. Transformation by SV40 occurred in either serumsupplemented medium or chemically defined medium (COM). The fre quency was greatest in serum-supplemented medium but transformants did not remain differentiated. In contrast, SV40 transformants develop...

Cultured hepatocytes from adult Fischer 344 rats were transformed by virion or cloned simian virus 40 (SV40) DNA using the calcium phosphate method. Transformation by SV40 occurred in either serumsupplemented medium or chemically defined medium (COM). The fre quency was greatest in serum-supplemented medium but transformants did not remain differentiated. In contrast, SV40 transformants develop...