PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “WASPS”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,171 records · Page 65Linked to original sources
PubMed1993

Accessory nuclei in the oocytes of the cockoo wasp, Chrysis ignita (Hymenoptera: Aculeata).

In the oocytes of Chrysis ignita, accessory nuclei (AN) arise before yolk formation, during advanced previtellogenesis. Two categories of AN, small (SAN) and large (LAN) can be distinguished at this stage of development. Both AN categories contain two dense, morphologically distinct inclusions (termed A and B) immersed in a translucent matrix. AN are exclusively located in the cortical (peripheral) ooplasm. Moreover, LAN are asymmetrically distributed also along the antero-posterior axis of the oocyte, and occur preferentially in the anterior pole periplasm. In contrast, the distribution of SAN is uniform throughout the periplasm.

Animals↗
PubMed1976

Preliminary studies on the mucus secretion of the wood wasp, Sirex noctilio F. I. Physicochemical and biochemical properties.

The major component of S. noctilio mucus appears to be a protein-polysaccharide complex with probable molecular weight in the range 60000-100000. In aqueous solution the macromolecule undergoes slow spontaneous disaggregation to yield dialysable subunits of molecular weight 2000-6000 which retain all the physiological activity of the whole mucus. More rapid disaggregation is brought about by treatment of solutions with moderate concentrations of NaCl, KC1 OR CaCl2, or by heating. The native mucus contains amylase, esterase, phenoloxidase and proteolytic enzyme activities, and it is suggested that these enzymes may be responsible, at least in part, for the "natural" disaggregation process.

Amylases↗
PubMed1977

Stimuli eliciting sexual pursuit in the digger wasp Bembex rostrata (L.) males (Hymenoptera, Sphegidae). I. The choice of an adequate method for the ethometry survey.

Ethometry (i.e., quantitative, numerical analysis) of approach of the insect to objects moved in the air with a fishing rod and their pursuit proved a successful field method for objective evaluation of the valence of an object's features for Bembex rostrata males tested during their "sun dance". The maximum distance from which the insect reacts with a leap toward the object being a parameter of its approach, is directly proportional to the conspicuity of the object. The time of "behavioural interest" of the insect in the object, a measure of pursuit, reflects the persistence of the insect's attraction to the object, which is directly related to its valence. It is suggested that the sun dance is mainly a comfort behaviour, when the male is at the same time highly sensitive to sexual stimuli. Approach to a flying object is not a simple reflex-like tactic behaviour but a motivated one. Probably it is partly an exploratory, and to some extent a sexual behaviour, whereas pursuit is to a considerable extent dependent on a sexual mood. Hence, both can be regarded as the steps of a sexual appetitive behaviour. Experiments revealed a considerable variability of reactions among individual B. rostrata males. Differences between years of experimenting exert significant influence on results, too.

Animals↗