El tipo mutante « pink-wing » de Drosophila melanogaster. Un problema de localización

Peer reviewe

Goring, Calvin

HQ. Battery Div. Artillery, Fort Huachuca, Arizonahttps://dh.howard.edu/prom_members/1031/thumbnail.jp

Tenancy as it Affects the Negro Farmer in Brazos County, Texas

The writer is deeply concerned about the existing condition of the Negro farmer of Brazos County, Texas. This interest, on the part of the reporter, caused him to make this study. In this study the writer found, along with many other factors which might be responsible, that tenancy\u27s playing its part in the big resession Negro farmer. It is well not to put the blame on tenancy, but the way it has been done. Tenancy being one of the stepping stones to ownership of land, must have due re- cognition. Tenancy is the use of land for which one pays rent to the owner. In this report the writer wishes to point up the actual value of tenancy. Every person is entitled to a portion of the God given heritage in proportion as he demands it. Of course, this means he must have a desire for the land and the ability to pay the price for it. It is hoped that through this report the Negro farmer can see his condition, find some suggested means which will help him come back to the joys of farm life that he once knew. This study reveals some conditions existing among rural people that are very interesting. One of the most interesting things is, that those who are living in the rurals and driving some ten or more miles to work every day, seem to be perfectly satisfied. Most of these jobbers do not even have a garden. It is also found that this type of living soon separates the parents and the children because there is no employment for them as they grow up. Naturally, the children will be inclined to follow city life because of what he calls better living. This decision, in the greater number of cases, is the result of having spent twelve years in the city schools. Sample communities were selected which the writer thought would give a fair picture of the county situation. These communities are located; one ten miles north of the county seat, one eight miles east, one thirteen miles south east, one fourteen miles south, one nine miles west, and one seven miles north west. The office of the County Agricultural Extension Agent, Office of The Home Demonstration Agent, and other interested persons were consulted in the study

A diffuse radar scattering model from Martian surface rocks

Remote sensing of Mars has been done with a variety of instrumentation at various wavelengths. Many of these data sets can be reconciled with a surface model of bonded fines (or duricrust) which varies widely across the surface and a surface rock distribution which varies less so. A surface rock distribution map from -60 to +60 deg latitude has been generated by Christensen. Our objective is to model the diffuse component of radar reflection based on this surface distribution of rocks. The diffuse, rather than specular, scattering is modeled because the diffuse component arises due to scattering from rocks with sizes on the order of the wavelength of the radar beam. Scattering for radio waves of 12.5 cm is then indicative of the meter scale and smaller structure of the surface. The specular term is indicative of large scale surface undulations and should not be causally related to other surface physical properties. A simplified model of diffuse scattering is described along with two rock distribution models. The results of applying the models to a planet of uniform fractional rock coverage with values ranging from 5 to 20% are discussed