7,983 research outputs found
Life History and Laboratory Rearing of \u3ci\u3eCorythucha Juglandis\u3c/i\u3e (Hemiptera: Tingidae) With Descriptions of Immature Stages
The life history of Corythucha juglandis was investigated in Jackson and Alexander counties. Illinois. August 1981-December 1985 and the immature stages were described. The bug was also raised from egg to adult under controlled laboratory conditions. This apparently bivoltine species overwintered as adults that became active in late April-early May. began feeding on the undersides of black walnut leaflets, and reproduced shortly thereafter. The seasonal occurrence of the adults and subsequent immature stages is discussed. Adults were last observed in mid-October. C. juglandis was reared on black walnut leaflets under a 16L:8D photoperiod at ca. 23.9°C. The pre-ovipositional, ovipositionaL and post-ovipositional periods averaged 14.0, 50.3, and 11.9 days, respectively: average fecundity was 118.6. The incubation period, and 1st, 2nd, 3rd, 4th, and 5th stadia averaged 16.4,4.3,3.8,4.2,4.6, and 6.7 days, respectively
A List of the Odonata of the La Rue-pine Hills Ecological Area
A survey of the adult odonate fauna of the La Rue-Pine Hills Ecological Area, Union County, Illinois, was conducted during 1983-1985. Thirty six. species were collected including the damselfly Telebasis byersi Westfall; this damselfly is known to occur in Illinois only at Pine Hills
Odonata at a Small Woodland Pond in Southern Illinois
A survey of the adult odonate fauna of a small woodland pond in Pope County, Illinois, was conducted during 1983--·1984. Twenty-four species were collected including Aeshna mutata and Anax longipes. In addition, Libellula vibrans was collected in 1982, and Aeshna sp. (probably u. umbrosa) observed the same year but not collected
Effects of Various Split Developmental Photophases and Constant Light During Each 24 Hour Period on Adult Morphology in \u3ci\u3eThyanta Calceata\u3c/i\u3e (Hemiptera: Pentatomidae)
Rearing immatures of Thyanta calceata in a range of split photophases during each 24 h period and in constant light showed that the adult dimorphic response in color and pu- bescence could be produced; individuals reared in photoperiods in which each scotophase was at least 2 h in length generally developed into the fall/spring morph
The First Report of the Occurrence of \u3ci\u3eMecidea Major\u3c/i\u3e (Hemiptera: Pentatomidae) in Illinois
(excerpt)
Species of the phytophagous genus Mecidea occur in the subtropical and adjacent tem- perate parts of the world and appear to be associated with xerophytic and semixerophytic areas (Sailer, Proc. U.S. Natl. Mus. 102:471-505, 1952)
Research in particles and fields
The astrophysical aspects of cosmic rays and gamma rays and of the electromagnetic field environment of the Earth and other planets are investigated. These investigations are carried out by means of energetic particle and photon detector systems flown on spacecraft and balloons
The advantages of demographic change after the wave: Fewer and older, but healthier, greener, and more productive?
Population aging is an inevitable global demographic process. Most of the literature on the consequences of demographic change focuses on the economic and societal challenges that we will face as people live longer and have fewer children. In this paper, we (a) briefly describe key trends and projections of the magnitude and speed of population aging; (b) discuss the economic, social, and environmental consequences of population aging; and (c) investigate some of the opportunities that aging societies create. We use Germany as a case study. However, the general insights that we obtain can be generalized to other developed countries. We argue that there may be positive unintended side effects of population aging that can be leveraged to address pressing environmental problems and issues of gender inequality and intergenerational ties
Relation of the Radial Gradient of Cosmic-Ray Protons to the Size of the Solar-Modulation Region
The radial intensity-gradient of cosmic-ray protons has been
calculated for a range of values of the distance to the boundary
of a spherically symmetric solar-modulation region. We find
that the radial dependence of the gradients may be described
in terms of two characteristic domains of the modulation region:
(a) an "inner region" where the gradients are relatively small
and constant, and (b), an "outer region"' where the gradients
are large and show a strong radial dependence. The magnitude
of the gradient in the inner region is small for reasonable
values for the physical parameters of the modulation mechanism
A two-dimensional Fermi liquid with attractive interactions
We realize and study an attractively interacting two-dimensional Fermi
liquid. Using momentum resolved photoemission spectroscopy, we measure the
self-energy, determine the contact parameter of the short-range interaction
potential, and find their dependence on the interaction strength. We
successfully compare the measurements to a theoretical analysis, properly
taking into account the finite temperature, harmonic trap, and the averaging
over several two-dimensional gases with different peak densities
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