44 research outputs found
DIE ENTWICKLUNGSPHYSIOLOGIE KREUZWEISE VERDOPPELTER EMBRYONEN. Festvortrag*, gehalten bei der 70. Geburtstagsfeier von Otto Mangold am 6. November 1961 im Heiligenberg-Institut
Laboratory and field experiments towards the development of an attract and kill strategy for the control of the codling moth, Cydia pomonella
A viscous formulation based on castor oil containing the pyrethroid insecticide cyfluthrin and E8, E10-dodecadienol, the main component of the codling moth sex pheromone, (Cydia pomonella L.: Tortricidae, Olethreutinae) was developed. The insecticidal performance of the formulation was evaluated in the laboratory using a tarsal-contact bioassay. The pheromone dosage required to attract male moths to the formulation was determined in behavioural tests performed in a wind tunnel. The efficacy of formulations applied to seedlings of the host plant was further investigated in glasshouse experiments conducted with male moths in small wire-gauze cages. The laboratory tests resulted in a formulation for preliminary field trials containing 4% cyfluthrin and 0.1% pheromone. During the 1995 growing season, experiments were conducted in apple orchards at three locations in Germany. The formulation was first applied to the bark of apple trees (Malus domestica) in mid May and then again in late July. A good level of control, comparable with a spray treatment using the insect growth regulator Alsystin was achieved. The potential of the attract and kill strategy, combining selective attraction of a pest species with the efficacy associated with a pyrethroid insecticide treatment, as a means of controlling the codling moth in commercial apple growing, is discussed
Asymmetric Segregation and Polarized Redistribution of Pole Plasm During Early Cleavages in the Tubifex Embryo: Role of Actin Networks and Mitotic Apparatus. (Tubifex/cleavage/pole plasm/redistribution/cytoskeleton)
Behaviour of centrosomes in early Tubifex embryos: asymmetric segregation and mitotic cycle-dependent duplication
�ber die submikroskopische Organisation und die biochemische Kennzeichnung embryonaler Entwicklungsstadien vonTubifex
Modeled black carbon radiative forcing and atmospheric lifetime in AeroCom Phase II constrained by aircraft observations
Atmospheric black carbon (BC) absorbs solar radiation, and exacerbates global warming
through exerting positive radiative forcing (RF). However, the contribution of BC to
ongoing changes in global climate is under debate. Anthropogenic BC emissions, and
5 the resulting distribution of BC concentration, are highly uncertain. In particular, long
range transport and processes affecting BC atmospheric lifetime are poorly understood.
Here we discuss whether recent assessments may have overestimated present
day BC radiative forcing in remote regions. We compare vertical profiles of BC concentration
from four recent aircraft measurement campaigns to simulations by 13 aerosol
10 models participating in the AeroCom Phase II intercomparision. An atmospheric lifetime
of BC of less than 5 days is shown to be essential for reproducing observations
in remote ocean regions, in line with other recent studies. Adjusting model results to
measurements in remote regions, and at high altitudes, leads to a 25% reduction in
AeroCom Phase II median direct BC forcing, from fossil fuel and biofuel burning, over
15 the industrial era. The sensitivity of modeled forcing to BC vertical profile and lifetime
highlights an urgent need for further flight campaigns, close to sources and in remote
regions, to provide improved quantification of BC effects for use in climate policy