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1. Immunocytochemical distribution of angiotensin-I converting enzyme in the central nervous system of insects and speculations about its possible function

Creator:
De Loof, Arnold, Isaac, , Elwyn, Salzet, Michel, Huybrechts, Roger, Veelaert, Dirk, Schoofs, Liliane, Macours, Nathalie, and Vandingenen, Anick
Format:
print, text, and regular print
Type:
article, bibliography, model:article, and TEXT
Subject:
zoologie, entomologie, hmyz, Locusta migratoria, corpus cardiacum, pars intercerebralis, neuropeptidy, angiotensin-I převodní enzym, funkce, rozšíření, imunocytochemické stanovení, 595.2/.7, and 591.1
Language:
English
Description:
Insect peptidyl-dipeptidase A [angiotensin I - converting enzyme (ACE)] is a soluble single-domain peptidyl-dipeptidase that has many properties in common with the C-domain of mammalian somatic ACE and with the single-domain mammalian ACE. In agreement with a variety of insects, immunocytochemical studies reveal the presence of an ACE-like protein in Locusta migratoria. ACE-like immunoreactivity is present in neurosecretory cells of the pars intercerebralis. These cells have axons projecting into the nervus corporis cardiaci I and into the storage part of the corpus cardiacum, a neuroendocrine organ directly releasing into the aorta. The localisation of ACE in neurosecretory cells is consistent with its proposed role as a processing enzyme that is involved in the generation of active peptide hormones., Dirk Veelaert, Liliane Scoofs, Nathalie Macours, Anick Vandingenen, Arnold De Loof, Elwyn Isaac, Michel Salzet, Roger Huybrechts, and Lit
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Species at the edge of their range: The significance of the thermal environment for the distribution of congeneric Craspedolepta species (Sternorrhyncha: Psylloidea) living on Chamerion angustifolium (Onagraceae)

Creator:
Bird, Jeremy M. and Hodkinson, Ian D.
Format:
print, text, and regular print
Type:
article, bibliography, conference publication, model:article, and TEXT
Subject:
Third European Workshop of Invertebrate Ecophysiology (1998 : Birmingham, Česko), zoologie, fyziologie živočichů, ekofyziologie, hmyz, Psylloidea, Craspedolepta nebulosa, Craspedolepta subpunctata, výskyt, rozšíření, životní cyklus, fenologie, ekologické faktory, teplota, sezónní vlivy, 591.5, 061.3, and 595.2/.7
Language:
English
Description:
There is much current discussion about the factors that control the distribution and abundance of animal species, particularly at the edges of their range. The significance of temperature for survival and development is compared in two closely related psyllid species (Craspedolepta nebulosa and C. subpunctata) living on the same host plant (Chamerion angustifolium) (Onagraceae) but displaying different distributions along latitudinal and altitudinal gradients. The following measurements were made at critical periods during the life cycle (a) winter supercooling points (SCPs), (b) tolerance of short (1 min) and long term (1-25) days exposure to sub-zero temperatures above the SCP, (c) tolerance of short term exposure to high spring/summer temperatures and (d) comparative field development rates among species and sites during the early critical part of the growing season. Successful completion of the life cycle is related to heat availability during the growing season. This appears to limit the distribution of the Craspedolepta species, rather than their survival response to thermal extremes. No significant differences were found between the two species in the supercooling point or in their long and short term survival responses at low or high temperatures., Jeremy M. Bird, Ian D. Hodkinson, and Lit
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public