By Lars Hörmander
Spectral research of singularities / L. Hörmander --
Fourier critical operators with complicated part features / J. Sjöstrand --
Hypoelliptic operators with double features / A. Menikoff --
Differential boundary price difficulties of significant variety / R.B. Melrose --
Propagation of singularities for a category of operators with double features / N. Hanges --
Subelliptic operators / L. Hörmander --
Lacunas and transmissions / L. Boutet de Monvel --
Some classical theorems in spectral concept revisited / V. Guillemin --
A Szegö theorem and entire symbolic calculus for pseudo-differential operators / H. Widom.
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Extra resources for Seminar on singularities of solutions of linear partial differential equations
The region of the subgena above the mandible is called the pleurostoma, and that part behind the mandible is the hypostoma. In hypognathous insects with a thick neck, the posterior ventral part of the head capsule is membranous. The postmentum of the labium is contiguous with this membrane, articulating with the subgena on either side. The hypostomal sulci bend upwards posteriorly and are continuous with the postoccipital suture (Fig. 4a). In insects with a narrow neck, permitting greater mobility of the head, and in prognathous insects, the cuticle of the head below the occipital foramen is sclerotized.
These caterpillars have specialized chemoreceptors that detect PA and stimulate feeding. Intriguingly, the PA receptors on the mouthparts of parasitized caterpillars respond more vigorously to those of unparasitized larvae, providing a mechanism for self-medication. Among nectar-feeding insects, sugars are phagostimulants. Before starting to feed, the insects exhibit a sequence of behaviors comparable with that of the leaf-chewing insects. If the tarsi contact sugar above a certain threshold concentration, the proboscis is extended.
Advances in Insect Physiology 32, 49–205. Zacharuk, R. Y. (1985). Antennae and sensilla. In Comprehensive Insect Physiology, Biochemistry and Pharmacology, vol. 6, ed. G. A. Kerkut and L. I. Gilbert, pp. 1–69. Oxford: Pergamon Press. 13 Comp. -E. and Schneider, D. (1960). Sensillen und Bau der Antennengeissel von Telea polyphemus. Zoologische Jahrbu¨cher (Anatomie) 78, 559–584. Imms, A. D. (1940). On the antennal structure in insects and other arthropods. Quarterly Journal of Microscopical Science 81, 273–320.