Germ Line-Specific DNA Sequences are Present on All Five Micronuclear Chromosomes in \u3cem\u3eTetrahymena thermophila\u3c/em\u3e

The development of the macronucleus from the zygotic micronucleus in the ciliated protozoan Tetrahymena spp. involves the elimination of specific DNA sequences (M. C. Yao and M. Gorovsky, Chromosoma 48:1-18 1974). The present study demonstrates that micronucleus-specific DNA is present on all five of the micronuclear chromosomes. Fragments of micronuclear DNA from Tetrahymena thermophila were cloned in the plasmid vector pBR322. A procedure was developed to examine the organization of the cloned sequences in micro- and macronuclear DNA without nick translating each individual probe. Twenty-three percent of randomly selected DNA sequences examined by this method were micronucleus (germ line) specific. They were all members of families of repeated sequences. Hybridization of six micronucleus-specific DNA sequences to micronuclear DNA from nullisomic strains of T. thermophila, which are lacking one or more pairs of chromosomes in the micronucleus, suggested that these sequences are present on several chromosomes. One micronucleus-specific sequence was shown by in situ hybridization to be present on all five of the micronuclear chromosomes

Gold, Liquidity and Secured Loans in a Multi-Stage Economy. Part II. Many Durables, Land and Gold

In a previous paper (Shubik and Yao, 1988) we examined a multistage exchange economy with m perishable goods and one infinitely durable gold used as money. we considered an economy without credit and one with one hundred percent secured loans. In this paper we consider an economy with m(1) goods which have finite lives and m(2) goods which are of infinite durability. Historically the two durables which have been prominent in economic activity have been gold and land, although one might wish to include platinum and some other items

Standoff alpha radiation detection via excited state absorption of air

This is the published version. © Copyright 2013 AIP Publishing LLCA standoff alpha radiation detection technique based on the physical mechanism of excited state absorption of air molecules was explored and is presented in this paper. Instead of directly detecting the radiation via measuring the intensity of radiation induced air fluorescence, the radiation is detected via the excited state absorption of alpha radiation excited/ionized air molecules. Both theoretical analyses and experimental verifications were conducted. The experimental results confirmed that the radiation could be detected via excited state absorption of radiation excited/ionized air molecules at a 10 m standoff distance, which was consistent with the theoretical analyses

Detection of a single cobalt microparticle with a microfabricated atomic magnetometer

We present magnetic detection of a single, 2 {\mu}m diameter cobalt microparticle using an atomic magnetometer based on a microfabricated vapor cell. These results represent an improvement by a factor of 105 in terms of the detected magnetic moment over previous work using atomic magnetometers to detect magnetic microparticles. The improved sensitivity is due largely to the use of small vapor cells. In an optimized setup, we predict detection limits of 0.17 {\mu}m^3.Comment: 3 pages, 3 figure

Your house just doubled in value? Don't uncork the champagne just yet!

Wenli Li and Rui Yao present their recent research, which tries to quantify the effects of house-price changes on both consumption and the well-being of American households. Their study looks at the economy as a whole, as well as different demographic groups.Housing - Prices ; Consumption (Economics)

On the Laplace transform of perpetuities with thin tails

We consider the random variables $R$ which are solutions of the distributional equation R\overset{\cL}{=}MR+Q, where $(Q,M)$ is independent of $R$ and \ABS{M}\leq 1. Goldie and Gr\"ubel showed that the tails of $R$ are no heavier than exponential. In this note we provide the exact lower and upper bounds of the domain of the Laplace transform of $R$