Dual Mode Hydrazine Propulsion System

Dual mode hydrazine propulsion system for attitude control and maneuvering of interplanetary spacecraf

Rearing of \u3ci\u3eScolytus Multistraiatus\u3c/i\u3e (Marsham) (Scolytidae: Coleoptera) for Toxicological Experiments

(excerpt) In a study of the oral and contact toxicity of methoxychlor residues to the smaller European elm bark beetle, S, multistriatus, it is essential to have beetle material available which is of uniform physiological condition and age (Riedl, 197 3). Several rearing containers for bark beetles have been described in the literature (Clark and Osgood, 1964; Fox, 1958; Germain and Wygant, 1967; Schmitz, 1972). A common problem in such containers appears to be fungus growth on the logs due to insufficient ventilation and high humidity. Although these environmental conditions might not cause high mortality, they can render emerging beetles unsuitable for bioassays. In order to guarantee fresh beetle material of uniform age newly emerged beetles must be extracted immediately. This paper describes emergence drums with a ventilation system that prevents fungus growth. Also described is an efficient extraction device which prevented the insect from moving back into the rearing container once it reached the collecting apparatus

Aspects of the Feeding Behavior of \u3ci\u3eScolytus Multistriatus\u3c/i\u3e (Marsham) (Scoltytidae: Coleoptera) and Implications for Control

(excerpt) Successful protection of elm trees can only be accomplished by means of thorough understanding of the feeding behavior of the smaller European elm bark beetle, Scolytus multistriatus (Marsham). Wolfenbarger and Buchanan (1939) and Whitten (1958) noted that most feeding occurred in the outer portion of the upper crown region, but offered no quantitative data. Therefore, this study was initiated to investigate the regional distribution of feeding injuries along a vertical and horizontal gradient in native American elm, Ulmus americana L

Analytical and experimental investigations concerning the dual mode hydrazine system, task 4 Summary report, 1 Aug. 1967 - 1 Feb. 1968

Dual mode hydrazine system for attitude control and maneuvering propulsion of interplanetary space prob

Laboratory Rearing of Phalangium Opilio (Arachnida: Opiliones)

While a good deal of work has been reported on the natural history and ecology of the opiliones in Europe and England (Bristowe, 1949; Sankey, 1949; Todd, 1949; Phillipson, 1959; Savory, 1964; Juberthie, 1965), this important group has received little attention in North America. Bishop (1949) published a concise synopsis of reactions and general habits of the opiliones of New York and, in a Ph. D. dissertation, Edgar (1960) described the biology of the order in Michigan. Current studies at Michigan State University on the effects of insecticides on non-target organisms have revealed an acute lack of biological information on the group, and before the effects of insecticides could be determined, life histories of the opiliones had to be clarified. Consequently, in 1966 a study of the ecology and rearing requirements of selected Michigan species was initiated. The present paper describes a new incubation technique for opilione eggs that shows promise of facilitating laboratory rearing of this group

The Life History of Folsomia Candida (Willem) (Collembola: Isotomidae) Relative to Temperature

The parthenogenetic mode of reproduction in Collembola, although frequently questioned in the past (Schaller, 1953; Mayer, 1957; Falkenhan, 1932), has only recently been recorded and confirmed for several species; Onychiutus parthenogeneticus Choudhuri (Choudhuri, 1958), Folsomia candida (Willem) (Goto, 1960; Marshall and Kevan, 1962; Green, 1964; Husson and Paldvody, 1967), Folsomia cavicola Cassagnau and Delamare (Goto, 1960), Tullbergia krausbaueri (Bomer) (Hale, 1966; Petersen, 1971), and Isotoma notabilis Schaffer (Petersen, 1971). Sex-ratios in populations of the above cited species are often unknown. Existing data indicate that the composition of a population may vary with the geographical distribution of the species. Populations of Folsomia candida (Willem), known to be bisexual in England (Goto, 1960), have been found so far to consist entirely of females in Canada (Sharma and Kevan, 1963a) and in Michigan (Snider, 1973). Similar to I. notabilis and T. krausbaueri (Petersen, 1971), investigations throughout the year and over larger geographic areas are necessary before northern USA and Canada F. candida may be labeled as obligatory parthenogenetic. Snider (1973) recorded in detail the life cycle of F. candida at 21°C. The present study provides information on the influence of temperature on the bionomics of the species

Hydrazine electrolysis for spacecraft propulsion. Analysis and test of a dual-mode gas and liquid system Final report

Dual-mode hydrazine electrolysis for spacecraft propulsion syste

Culture Techniques for Rearing Soil Anthropods

Excerpt: Interest in soil biology has been prompted by recent investigations into the action of insecticides on plants and animals. Observations in the field must be supplemented by laboratory investigations conducted under controlled conditions. Consequently, it becomes necessary to rear and handle soil animals under artificial situations for bio-assay and life cycle studies. When large numbers of individuals are required, special problems in maintenance and manipulation arise. Relatively inexpensive and simple methods for such projects are essential and this paper describes some of those techniques which we have found expedient

ECONOMIC MODELING OF FARM PRODUCTION AND CONSERVATION DECISIONS IN RESPONSE TO ALTERNATIVE RESOURCE AND ENVIRONMENTAL POLICIES

Environmental Economics and Policy, Farm Management,

Perceptions of Tennessee School-Based Agricultural Education Teachers\u27 Attitudes Toward Globalizing the Agricultural Curriculum

The agriculture industry is part of an interconnected world that is continually navigating complex trade regulations and cultural barriers. Graduates of School-Based Agricultural Education programs need to be prepared to positively communicate with people from all over the world and to have an understanding of international agricultural practices. The purpose of this study was to explore the perceptions of Tennessee School-Based Agricultural Educators towards globalizing the secondary agricultural curriculum. Twenty-six School-Based Agricultural Educators were interviewed for this study. The interviewees represented the entire state of Tennessee, including both urban and rural programs. The use of thematic analysis allowed the following five themes to emerge: (a) heightened awareness of living in a globalized world, (b) vision for a globalized School-Based Agricultural Education program, (c) benefits of exposure to a globalized School-Based Agricultural Education program, (d) preparedness to teach from a globalized perspective, and (e) professional development needs. Participants recognized the importance of teaching through a globalized agricultural curriculum and the benefits students received from experiencing a globalized agricultural curriculum. However, not every participant felt prepared to teach using a globalized curriculum and suggestions for professional development were made