Calcium alginate gels are widely used in the biotechnology, food, and pharmaceutical industries for cell immobilization, food additives, and controlling the release of therapeutic agents. Different gelation conditions can lead to different gel structures which affects the diffusion of solutes in gels, thus mathematical models were developed to describe diffusion...
Chalkbrood is a mycosis of larvae of the alfalfa leafcutting bee,
Megachile rotundata (Fabricius). It is a serious threat to alfalfa seed
growers in western North America who use populations of this bee for
pollination. Basic studies were conducted to determine the etiology of
this disease and the course of...
The behaviors of the alfalfa leaf cutter bee - seed
production system under imposition of several management
regimes were studied through the use of a simulation
model that contains mechanisms for the following
processes: 1) immature bee development and diapause; 2)
immature bee mortality; 3) female bee emergence; 4)
nesting...
Immunotaxonomic studies have largely been based
on serology in which either one of two parameters has
been used for establishing relationships: (1) the number
of precipitin arcs formed on Ouehterlony plates, or
(2) the total amount of precipitin resulting from
reactions with a standard antiserum.
Recognizing the restrictions of both...
The rhythms of emergence, oxygen consumption, and activity
were studied in Megachile rotundata with the object of comparing the
results to the major properties of the biological clock such as temperature
independence, susceptibility to light synchronization, and
entrainment. A further objective was to compare the three rhythms
to determine if...
Nomia melanderi Cockerell is one of the most efficient pollinators of alfalfa in Eastern Oregon. Emergence begins in June, usually reaches its peak in early July, and may continue into early August. Male emergence precedes female emergence by four or five days. For the first few weeks of this time,...
The purpose of the study was to determine an emergence
rhythm, its period, and the developmental stages susceptible to
emergence synchronization in the leafcutter bee Megachile rotundata
(Fabricius). An attempt was made to determine if an oxygen consumption
rhythm was present in the pupal and adult stages of the
alkali...
Organogenesis was observed in different age embryos and first
instar larvae of Nomia melanderi Cockerell (Halictidae), Megachile
rotundata (Fabricius) (Megachilidae), and Bombus griseocollis
(DeGeer) (Apidae) (Hymenoptera : Apoidea). It was found that, with
the exception of the ventral nerve cord, comparable organ development
had occurred by the beginning of the...
The objectives of this study were: a) to obtain and evaluate
equipment for bio-acoustical analysis for this work and for future
work in the analysis of insect sounds, b) to study the acoustical and
sexual behavior of Acheta domesticus L., and c) to determine methods
for analyzing the changes effected...