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Institute
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Nach einigen fehlgeschiagenen Versuchen, in der Frankfurter Nidda-Aue eine große Parkanlage einzurichten, entwickelten Planer und Politiker in den 80er Jahren ein Konzept, um unter dem Motto „Natur in der Stadt" und mit der Hilfe einer Gartenschau ein bisher vorwlegend agrarisch und gartenbaulich genutztes Areal in eine naturnahe Grünanlage zu verwandeln. Der vorliegende Beitrag rekonstruiert in kritischer Weise den Planungs- und Realisierungsprozess vom Ausgangszustand über die BUGA'89 bis hin zur Anlage des Volksparks Niddatal. Etwa zehn Jahre nach Ende der Parkeinrichtung werden die unterschiedlichen Aspekte der Fläche hinsichtlich ihrer Nutzbarkeit und ihrer Potentiale für die Stadtnatur betrachtet. Dabei zeigt sich, dass die unmittelbar auf den Menschen bezogenen Planungszieie durchweg erreicht wurden, bei den auf die Natur abzielenden Vorstellungen aber Defizite festzustellen sind. Drastisch formuliert besteht der ökologische Wert der Maßnahmen derzeit vorrangig in der Bewahrung des Areals vor Bebauung. Die Lebensraumqualität für Pflanzen und Tiere sowie Naturnahe der neuangelegten Bereiche ist bisher noch relativ gering, nicht zuletzt aufgrund der massiven Eingriffe im Rahmen der Bauarbeiten. Auf längere Sicht werden dem Volkspark Niddatal aber sehr gute Chancen einer für urbane Verhältnisse naturnahen Entwicklung zuerkannt.
The paper deals with the biology, morphology and anatomy of seven species of syrphid larvae viz. Syrphus luniger Meig., S. balteatus De Greer, S. ribesii Linne, Catabomba pyrastri Linne, Sphaerophoriae flavicauda Zett., Sph. scripta Linne, and Platychirus scutatus Meig. The habitat, mode of progression, aphidophagous habits and characteristic coloration are described for each species. It is shown that the larvae of aIl the above species, like larvae of other cyclorrhaphous Diptera, definitely pass through three stages separated by two moults. The mode of dehiscence of the puparium is described briefly. Each of the species, except Catabomba pyrustri, has three generations in the breeding season which lasts from May to October. Platychirus scutatus hibernates only in the larval stage, but the other species may be found in both the larval and pupal stages during the winter. The larvae of all the above species, except syrplzus balteatus, are commonly parasitized by ichneumonid larvae. The morphology of the egg, the three larval stages and the puparium of S. luniger is described in detail. The characters common to the third stage larvae of all the species deaIt with are summarized and short descriptions of the third stagelarvae andpuparia of the individual species are given. The general appearance of the living larvae and details of the buccopharyngeal armature, spiracles and puparia of each of the species is represented in figures. In connexion with the pupae a number of new structures are described arid it is suggested that some of them are concerned with the formation of the characteristic shape of the puparium and with the dehiscence of the puparium. Internal pupal spiracles are present in all the species dealt; with, but external pupal spiracles are present only in Platychirus scutatus. The anatomy of P. scutatus is described and figured, an account being given of all the structures except the musculature of the body wall. Study of the anatomy affords evidence as to the carnivorons mode of Iife of the larvae and also indicates that tho larvae have evolved from aquatic forms. The comparative morphology of the Syrphinae is discussed with respect to the relationship of the Syrphinae to other Aschiza aiid to the cyclorrhaphous Diptera.
A review of biological control efforts against Diptera of medical and veterinary importance includes pertinent literature of major dipterous taxonomic groups where some success has been achieved or where work is currently being conducted on species breeding in aquatic (e.g., mosquitoes, blackflies, tabanids) and terrestrial habitats (muscids, tsetse, etc.). Most effort has been directed against aquatic Diptera because of the human and animal disease agents they transmit. Research has established that the natural enemy component frequently is responsible for significant population reduction and indispensable to integrated control which seeks to maintain populations below annoyance or disease transmission levels. The manipulation of natural enemies through introduction and/or augmentation has in some cases provided satisfactory control, and sustained releases of natural enemies over several years may overcome the relative high cost of massive release rates. Ultimately, to guarantee the existence and maximum expression of resident natural enemies has become almost universally accepted, and challenging, to sound control practices. Indeed, chemical industry recognizing this, has sought to manufacture products such as Bacillus toxins, juvenile hormones, and baits that are minimally disruptive to existing natural controls. Although such easily applied products have been widely adopted, their cost continues to become prohibitive with developing resistance, as was observed earlier with many organophosphate and chlorinated hydrocarbon insecticides. Further advancements in the control ofthese Diptera should continue to embrace a sound appreciation for the natural control component and nurture ways to allow its maximum expression. Keyword Index: Biological Control, Diptera, Medical, Veterinary.
The re-emergence of tuberculosis in its present-day manifestations - single, multiple and extensive drug-resistant forms and as HIV-TB coinfections - has resulted in renewed research on fundamental questions such as the nature of the organism itself, Mycobacterium tuberculosis, the molecular basis of its pathogenesis, definition of the immunological response in animal models and humans, and development of new intervention strategies such as vaccines and drugs. Foremost among these developments has been the precise chemical definition of the complex and distinctive cell wall of M. tuberculosis, elucidation of the relevant pathways and underlying genetics responsible for the synthesis of the hallmark moieties of the tubercle bacillus such as the mycolic acid-arabinogalactan-peptidoglycan complex, the phthiocerol- and trehalose-containing effector lipids, the phosphatidylinositol-containing mannosides, lipomannosides and lipoarabinomannosides, major immunomodulators, and others. In this review, the laboratory personnel who have been the focal point of some to these developments review recent progress towards a comprehensive understanding of the basic physiology and functions of the cell wall of M. tuberculosis.
Se presenta una base de datos taxonómica y distribucional de los moluscos marinos, telTestres y dulceacuícolas de Chile continental e insular. Se ha descrito para Chile un total de 1.288 especies, incluidas en 236 familias. Estas especies representan alrededor del 1,8% de la fauna mundial conocida de moluscos recientes (en total unas 70.000 especies). Los gmpos más diversificados son Gastropoda (882 especies) y Bivalvia (233 especies). Del total, 1.070 son marinas, 132 terrestres y 83 de ambientes dulceacuiolas. Del total de especies, 13 son introducidas (terrestres: Milax gagates, Demceras laeve, D. reticulatum, Limax (Lehmannia) valentianus, L. (Limax)flavus, L. (L.) maximus, Oxychilus (Oxychilus) cellarius, O. (Ortizius) alliarius and Helix (Cryptomphalus) aspersa: marinas: Crassostrea gigas, Pecten mllximus, Haliotis rufescens y H. mimus) y 49 poseen importancia económica. Aun cuando las primeras referencias sobre moluscos chilenos datan de comienzos del siglo XVIII, se los conoce principalmente a través de los resultados de las expediciones oceanográficas de fines del siglo XIX y principios de éste.