Results 251 to 260 of about 1,254,509 (299)

Delayed mutation in Chinese hamster cells

Somatic Cell and Molecular Genetics, 1987
The possibility was examined that mutational events can be delayed for more than one or two cell divisions following treatment of Chinese hamster cells with the DNA alkylating agent ethyl methane sulfonate. If mutations in mammalian cells are delayed, the proportion of mutant cells in colonies grown from single mutagen-treated cells will reflect the ...
T, Stamato, R, Weinstein, B, Peters, J, Hu, B, Doherty, A, Giaccia   +5 more
openaire   +2 more sources

Robert Cell-Based Optical Delay Elements for White Cell True-Time Delay Devices

Journal of Lightwave Technology, 2013
A low-loss and compact optical delay element is devised to be integrated into existing White cell-based true-time delay systems. The delay element is based on a multiple-bounce cell that consists of simple optical components, which was initially described by Claude Robert for spectroscopy.
Yu Shi, Betty Lise Anderson
openaire   +1 more source

Timing Is Everything – Delaying Therapy for Delayed Cell Death

Developmental Neuroscience, 2002
Damage after a hypoxic-ischemic (HI) insult is both region and cell population specific [Johnston, 1998]. This observation is critically evident in, and important to, the pathogenesis of the insult in the immature central nervous system. In the term human neonate, damage to the deep grey nuclei is seen using magnetic resonance imaging (MRI) modalities ...
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G 2 Cells: Progression Delay and Survival

Radiation Research, 1984
The progression of Chinese hamster ovary (CHO) G2 cells into mitosis and their survival was measured after X-ray doses up to 4.0 Gy. S-phase cells were prevented from reaching mitosis by labeling with 125IUdR for 10 min prior to irradiation of the exponentially growing monolayer of cells. Mitotic cells, located past the radiation-induced division delay
M H, Schneiderman, G S, Schneiderman
openaire   +2 more sources

Gain-based Cell Delay Modeling

2006 International Symposium on VLSI Design, Automation and Test, 2006
Conventional cell delay modeling approaches calculate the propagation delay and output transition time of a CMOS logic cell, which is subjected to a noisy input waveform, by approximating this noisy waveform with a saturated ramp signal and then utilizing cell library delay look-up tables to report the output timing information.
Shahin Nazarian, Massoud Pedram
openaire   +1 more source

B-cell suppression of delayed hypersensitivity reactions

Nature, 1974
DURING certain normal immunisation schedules, suppressor cells are generated and act in suppressing the expression of delayed hypersensitivity reactions1,2. The suppression is immunologically specific and is dependent on living cells. We have suggested that the suppressor cells were B cells because they are depleted when 300 mg kg−1 cyclophosphamide ...
S I, Katz, D, Parker, J L, Turk
openaire   +2 more sources

Current division based delay cell

Proceedings of the Fifth IEEE International Caracas Conference on Devices, Circuits and Systems, 2004., 2005
This article shows a differential delay cell based on linear current division through two differential pairs. The current division is used for delay control purposes. The cell implements a VCO and some changes are added in order to improve frequency range.
G. Gutierrez, J. Finol
openaire   +1 more source

Delayed internucleosomal DNA fragmentation in programmed cell death

The FASEB Journal, 1993
DNA fragmentation was evaluated in three instances of programmed cell death, interdigital cell death in embryonic mouse limbs, and metamorphic death of both the labial glands and intersegmental muscle in the tobacco hornworm Manduca sexto.
ZAKERI ZF, QUAGLINO, Daniela, LATHAM T, LOCKSHIN RA   +3 more
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Design of tunable digital delay cells

2017 IEEE Custom Integrated Circuits Conference (CICC), 2017
This work discusses design considerations for implementing widely tunable delay cells with good matching properties, low jitter, and robust communication to adjacent circuits. Previously unreported effects that result in signal-dependent delay are discussed and eliminated.
Yu Chen, Rajit Manohar, Yannis Tsividis
openaire   +1 more source