Publications

the effect of chloramphenicol, ethidium bromide and cycloheximide on mortality and mitochondrial protein synthesis of adult blowflies.	the effects of cycloheximide, chloramphenicol and ethidium bromide on the blowfly calliphora erythrocephala were studied. in the first set of experiments, toxic levels were determined by examining activity and mortality of flies after injection of various doses of each drug. in the second set of experiments, the effect of drug treatment on flight muscle mitochondrial protein synthesis was determined in relation to age by following the incorporation of radioactively labelled amino acid, [3h]leuci ...	1980	7364884
body movements and retinal pattern displacements while approaching a stationary object in the walking fly, calliphora erythrocephala.	when a walking fly approaches a stationary object two types of body movements are distinguishable. type i body movements are characterized by low frequencies (0.4-1.3 hz) and large amplitudes (28-65 degrees). superimposed on these movements are type ii body movements which are characterized by high frequencies (7.3-10.6 hz) and small amplitudes (5.9-8.2 degrees) (figs. 3-6; table 1). type ii movements occur no matter whether the fly is fixating a pattern or orientating itself in homogeneous surr ...	1980	7459402
normal and experimentally induced lysosomal activity in the larval fat body of calliphora erythrocephala meigen.	acid phosphatase activity was demonstrated by em-cytochemistry in 4 day old third instar larvae of the fly calliphora erythrocephala meigen, but not in younger stages. during larval development, the activity increased, reaching a maximum at the onset of pupariation. the reaction product was localized in golgi vesicles and sacculi, in vacuoles and in protein granules of varying size and composition, confirming the autophagic character of the protein granules. throughout larval development, the re ...	1979	519734
chromomeres and puffing in experimentally induced polytene chromosomes of calliphora erythrocephala.	in the most advanced types of meroistic ovaries the synthesis of rna for the growing oocyte in each follicle is taken over by nurse cells, i.e., sister cells of the definite egg cell. in calliphora, the highly polyploid nurse cells (nc) develop a polytene karyotype under conditions of strict brother-sister inbreeding and using a controlled selection technique. a comparison of the polytene nc-chromosomes with those from the pupal bristle forming cells reveals an unexpected discrepancy: while both ...	1979	510083
demonstration of acid phosphatase activity induced by 20-hydroxyecdysone in the fat body of calliphora.	in the larval fat body of calliphora erythrocephala, protein accumulation and autophagic activity occur prior to the onset of puparium formation. the involvement of the lysosomal system in the degradation of sequestered protein and cell organelles can be demonstrated by the electron-microscopical cytochemical localization of the lysosomal marker enzyme acid phosphatase in so-called protein granules. these granules contain not only newly synthetized or absorbed protein but also remnants of cell o ...	1979	487409
transport of glial cell acid phosphatase by endoplasmic reticulum into damaged axons.	earlier observations indicated that cutting the photoreceptor (r) cell perikarya in the retina of the flies musca domestica and calliphora erythrocephala resulted in an extremely rapid degeneration of the r-cell axons. the process manifested itself within minutes and secondary lysosomes appeared early on in the degenerating axons. in this study, biochemical assays of the classical lysosomal marker enzyme acid phosphatase (acpase) showed a rapid increase in activity upon cutting the retina, reach ...	1979	457814
[ultrastructure of the mid-intestine muscle of the larva of calliphora erythrocephala meig].	the fine structure of the mid-gut muscle in larval calliphora erythrocephala meig. electron microscopy reveals and mid-gut muscle fibres to be composed of an array of actin and myosin myofilaments. the perforated z-band divides the fibril to sarcomeres. the average length of the sarcomere in 5,34 micrometer for the non contracted muscle and 2,09 micrometer for the fully contracted muscle. the thick filaments of the fully contracted muscle pass through the spaces of the z-structures.	1979	441456
synthesis and turnover of hdrna and mrna in the salivary gland of the blowfly calliphora erythrocephala.		1979	437351
how far does exposure to radiation mimic ageing in insects?--i. life table data from the blowfly, calliphora erythrocephala.		1979	520433
ontogenic fate of cerebral neurosecretory cells in calliphora erythrocephala (meig.) (cyclorhapha: diptera).		1978	640538
the differential regulation of the synthesis of ribosomal rna, 5 s rna, and 4 s rna in the polytenic salivary gland cells of the blowfly, calliphora erythrocephala.		1978	680366
[degeneration of the brush border in the midgut of calliphora erythrocephala meig].	the brush border of the intestinal epithelium is described in an actively feeding larvae of calliphora erythrocephala meig. it will persist intact after the appearance of the first signs of degeneration of the larval intestinal cells. it will then be invaginated inside the cell forming a "microvillar dense body."	1978	734198
chloramphenicol and ethidium bromide effects on flight-muscle mitochondria of the blowfly calliphora erythrocephala.		1978	744361
the effect of chromosomal polytenization on the rates of rna synthesis and decay in the salivary glands of the blowfly, calliphora erythrocephala.		1978	620873
fixation-sensitive areas in the eyes of the walking fly, calliphora erythrocephala.	in calliphora erythrocephala the visual fixation behaviour in one-eyed flies and partial blinded flies has been investigated. one-eyed flies show approximately the same stripe and edge fixation response as intact flies. elimination of the frontal eye parts including the binocular field of vision does not effect the visual stripe fixation. on the other hand, if only the frontal areas of both eyes including the binocular field of vision are left open, no preferential direction can be observed (fig ...	1978	728495
production of specific-protein secretion granules by fat body cells of the blowfly, calliphora erythrocephala. substitution of an ovarian key factor by beta-ecdysone.	during the first four days of the imaginal stage the fat cells of ovariectomized females of calliphora develop a protein synthetic apparatus, and produce dense bodies (lysosomes) as do the fat cells of normal females, but apparently they cannot synthesize the protein secretion granules that characterize the productive phase of the fat cells of normal females and that we believe to represent vitellogenin. injection of ovariectomized females with beta-ecdysone restored the ability of the fat cells ...	1978	719713
[morphogenesis of the imaginal abdominal epidermis in calliphora erythrocephala (insecta,diptera)].	the morphogenesis of the abdominal epidermis in calliphora erythrocephala begins by a cellular proliferation which proceeds slowly in larvae and rapidly in pupae. this allows histoblasts to glide and invade the whole abdominal surface. as soon as the new epidermal sheet has become continuous, differentiation begins. generalized epidermal cells show an intense activity which leads to the deposition of imaginal cuticle from the 6th day after pupation onwards. after cuticle deposition they darken a ...	1978	632740
the presence of a hypoglucemic and hypotrehalocemic hormone in the neurosecretory system of the blowfly calliphora erythrocephala.		1978	569615
[comparative study of hemocyte capsule formation in locusta migratoria, melolontha melolontha and calliphora erythrocephala].		1977	900777
the abdominal epidermis of the blowfly calliphora erythrocephala. ii. imaginal histoblasts during larval life.	abdominal histoblasts in calliphora (diptera) are situated within the larval epidermis, and secrete larval cuticle throughout the 3 larval instars. an optical and electron-microscopic study of histoblasts and epidermal sensilla suggests that the latter have been previously confused with histoblast anlagen in the first instar. a steady rate of division until the mid-third instar leads to anlagen growth, which is not seen in larval drosophila. after a relatively quiescent period, division begins a ...	1977	599177
the effect of prostaglandin e1 on cyclic amp production in the salivary glands of calliphora erythrocephala.		1977	198235
a family of quasi-white random signals and its optimal use in biological system identification. part ii: application to the photoreceptor of calliphora erythrocephala.		1977	889958
ultrastructure of the myocardial cell and its membrane systems in the adult fly calliphora erythrocephala (insecta: diptera).	calliphora erythrocephala has cross-striated cardiac muscle cells with a, i and z-bands. the diameters of the myosin and actin filaments are 200-250 a and 85 a respectively and the length of the myosin filaments (a-band) is approximately 1.5 micron. usually 8-10 actin filaments surround each myosin filament. the myocardial cells show a well-developed membrane system and interior couplings. a perforated sheet of sr envelopes the myofibrils at the a-band, dilates into flattened cisternae at both a ...	1977	872197
pattern and polarity of sclerites in adult abdominal segments of calliphora erythrocephala (diptera): anlage rotation experiments.	the anlagen of imaginal histoblasts in the abdominal segments of calliphora (higher diptera) present an interesting problem, which bears on recent concepts employed in the consideration of spatial patterning in insects. they differ from imaginal discs with respect to larval organization and activity, and in the absence of the progressive pattern of genetic determination during the larval period, characteristic of imaginal discs. how is the adult pattern in the abdominal segments determined? the ...	1977	870595
an ultrastructural study of the in vitro phagocytosis of escherichia coli by the hemocytes of calliphora erythrocephala.		1976	775121
intracellular responses from cells of the medulla of the fly, calliphora erythrocephala.		1976	953083
excretion of alkaloids by malpighian tubules of insects.	nicotine is transported at high rates by malpighian tubules of larvae of manduca sexta, pieris brassicae and rhodnius prolixus and the transport persists in the absence of alkaloid from the diet. in the fluid-secreting portion of rhodnius tubules this transport is not coupled to ion transport, nor is it dependent on the physiological state of the animal. the transport, which can occur against a steep electrochemical gradient, shows saturation kinetics with a maximal rate of 700 pmol. min-1 per t ...	1976	932618
[acid phosphatase activity in the hemolymph of the fly calliphora erythrocephala during metamorphosis].	acid phosphatase is present in the haemolymph of the fly calliphora erythrocephala. the activity of this enzyme has been studied during development; it shows a marked increase during hours following pupation. this increase of activity may be related to the histolytic processes which are acting during metamorphosis.	1976	139998
changes in acid mucopolysaccharides during the development of the blowfly, calliphora erythrocephala.		1976	133191
juvenile hormone and dna synthesis in imaginal disks of calliphora erythrocephala: results of a new incubation technique.		1976	1249433
[host range of drosophila melanogaster c virus among diptera and lepidoptera (author's transl)].	the host range of the c picornavirus of drosophila melanogaster was studied, using numerous strains of drosophila together with four other genera of diptera and two species of lepidoptera. c virus was injected into the different hosts and serially passaged in them. the extracts from each passage were biologically assayed on virus free d. melanogaster. four different situations were found. 1) a high level of multiplication leading, in 45 strains of drosophilidae, to the early death of the hosts. ...	1976	823856
effects of weismann ring gland on rna synthesis in imaginal wing disks of calliphora erythrocephala.		1976	965778
water transport across peritrophic membranes of calliphora erythrocephala--vii.		1976	7407
the comparative biochemistry of invertebrate mucopolysaccharides-v. insecta (calliphora erythrocephala).		1976	129315
the fine structure of peritrophic membranes of the blowfly, calliphora erythrocephala, grown in vitro under different conditions.		1976	1249440
independent replication of the ribosomal rna genes in the polytrophic-meroistic ovaries of calliphora erythrocephala, drosophila hydei, and sarcophaga barbata.	by filter saturation hybridizations the ribosomal (r)dna contents of the ovaries calliphora erythrocephala, drosophila hydei, and sarcophaga barbata have been measured in comparison to the rdna percentages of their diploid brains. the measurements of the ovarian rdna have been carried out on ovaries where the nurse cells in the distal egg chamber of the ovarioles had reached their highest ploidy level. the diploid rdna content of each of the respective species was chosen as a 100% standard and t ...	1975	1201686
role of the "thrombocytoids" in capsule formation in the dipteran calliphora erythrocephala.	of the three hemocyte types present in the blood of calliphora, only one participates in capsule formation around implanted cellophane. this hemocyte, the thrombocytoid, shows in the blood a tendency to dissociate into numerous small cytoplasmic fragments, comparable to the mammalian megakaryocyte. this tendency is dramatically increased during the process of encapsulation. most of the intact thrombocytoids and the numerous fragments participating in capsule formation do not show any particular ...	1975	1182767
the atpase system in the compound eye of the blowfly, calliphora erythrocephala (meig).		1975	240606
metabolism of beta-[3-h]ecdysone during the larval-pupal stage of the blowfly calliphora erythrocephala.		1975	1126545
linear and non-linear performance of transducer and pupil in calliphora retinula cells.	1. intracellular recordings have been made from the blowfly (calliphora erythrocephala) retinula cell; apart from the transducer mechanism, these cells also feature a pupil mechanism. 2. at several mean intensity levels, within the apparently linear range of response, frequency characteristics of amplitude and phase and responses to 'delta'-flashes and 'delta'-flash pairs have been obtained. 3. fourier methods have shown these responses to be mutually compatible, confirming linearity in these ci ...	1975	1142250
in vitro synthesis of peritrophic membranes of the blowfly, calliphora erythrocephala.		1975	1159308
ecdysone oxidase, an enzyme from the blowfly calliphora erythrocephala (meigen).	in the blowfly, the formation of 3-dehydroecdysone from the insect molting hormone ecdysone is catalyzed by an enzyme which carries hydrogen from ecdysone and ecdysterone to oxygen. the enzyme is therefore called "ecdysone oxidase". two methods are described for the detection of ecdysone oxidase activity, one using a radiolabelled substrate which is separated from the product by thin-layer chromatography after the reaction, and the other using dichloroindophenol, which is discoloured by the redo ...	1975	297
mode of formulation of cholesta-5,7-dien-3beta-ol from cholest-5-en-3beta-ol by larvae of calliphora erythrocephala.	1. the conversion of cholest-5-en-3beta-ol (cholesterol) into cholesta-5,7-dien-3beta-ol by axenic calliphora erythrocephala larvae was demonstrated. 2. the transformation is probably direct (delta(5)-->delta(5,7)) and does not involve a delta(0) intermediate (delta(5)-->delta(0)-->delta(7)--> delta(5,7)). 3. delta(7)-bond formation involves the stereospecific elimination of the 7beta hydrogen atom. 4. the relative amounts of free and esterified sterols were determined in larvae grown on cholest ...	1975	1220687
[the in vivo synthesis of ribonucleic acid in the imaginal wing discs during calliphora erythrocephala development].		1975	808282
the hydroxylation of tyrosine by an enzyme from third-instar larvae of the blowfly calliphora erythrocephala.	1. two pro-(phenol oxidase) were distinguished when the blood of late-third-instar larvae of calliphora erythrocephala was electrophoresed in polyacrylamide gels with tris-glycine buffer, ph 8.3. one pro-(phenol oxidase), after activation by an enzyme readily catalyses the oxidation of both l-tyrosine and l-3,4-dihydroxyphenylalanine (l-dopa). the second enzyme catalyses the oxidation of l-dopa but not of l-tyrosoine. 2. one of the pro-(phenol oxidases) was purified over 2000-fold from homogenat ...	1975	810140
the isolation of an o-diphenal oxidase from third-instar larvae of the blowfly calliphora erythrocephala.	1. the isolation of an o-diphenol oxidase from an acetone-dried powder of late-third-instar larvae of calliphora erythrocephala was investigated. an insoluble and micro-crystalline fraction containing the enzyme activity was obtained after fractionating extracts of the acetone-dried powder with (nh4)2so4 and acetone. 2. this fraction can be solubilized in 0.1% sodium dodecyl sulphate without loss of activity. 3. polyacrylamide-gel electrophoresis in the presence of sodium dodecyl sulphate shows ...	1975	812490
[ultrastructural aspects of the integumentary histoblast areas of the abdomen of calliphora erythrocephala during the first larval stage].		1974	4219150
embryogenesis of calliphora erythrocephala meigen. iv. cell death in the central nervous system during late embryogenesis.		1974	4434463
[morphogenesis of gonads in calliphora erythrocephala. descriptive study].		1974	4451973
fine structure of the fat body of the female of calliphora erythrocephala during the first egg-maturation cycle.		1974	4434465
[lemon--another eye colour mutant in the blowfly calliphora erythrocephala].		1974	4837324
secretion of hyperglycaemic hormone from the corpus cardiacum of flying blowflies, calliphora erythrocephala.		1974	4854213
the abdominal epidermis of calliphora erythrocephala (diptera). i. polyteny and growth in the larval cells.		1974	4417501
the relation between larval and adult abnormalities in the abdominal segmentation of calliphora erythrocephala (diptera).		1974	4463217
protein metabolism by the salivary glands and other organs of the larva of the blowfly, calliphora erythrocephala.		1974	4815640
the contribution of the fatbody to rna and ribosomal changes during development of the blowfly calliphora erythrocephala (meig).		1974	4826294
hormonal control of resilin deposition in the blowfly, calliphora erythrocephala.		1974	4839330
the ultrastructure of the developing leg disk of calliphora erythrocephala.		1974	4847934
the stereochemistry of hydrogen elimination from c-7 during biosynthesis of ecdysones in insects and plants.	1. [7alpha-(3)h(1)]- and [7beta-(3)h(1)]-cholesterol were synthesized by a modified method. 2. the stereochemistry of delta(7)-bond formation during ecdysone and ecdysterone biosynthesis in the insect, calliphora erythrocephala and the plants, taxus baccata and polypodium vulgare was investigated by using [4-(14)c,7alpha-(3)h(1)]cholesterol and [4-(14)c,7beta-(3)h(1)]cholesterol. 3. in each case, the 7beta hydrogen was stereospecifically eliminated. 4. the possible significance of the results is ...	1973	4772621
extracellular ribosomes during metamorphosis in the blowfly calliphora erythrocephala.		1973	4748818
the haemocytes of calliphora erythrocephala (meig.) (diptera).		1973	4355160
embryogenesis of calliphora erythrocephala. 3. ultrastructure of the midgut epithelial cells during late embryonic development.		1973	4358758
investigations on the transport function and structure of peritrophic membranes. 3. periodic incorporation of glucose, methionine and cysteine into the peritrophic membranes of the blowfly calliphora erythrocephala mg. in vivo and in vitro.		1973	4123259
purification and properties of a phenol oxidase from the blowfly calliphora erythrocephala.		1973	4123357
biochemical and structural variations in the flight muscle mitochondria of ageing blowflies, calliphora erythrocephala.		1972	4336113
ultrastructural changes in developing midgut epithelium of calliphora erythrocephala meigen.		1972	4339566
the ultrastructure and function of pericardial cells and other nephrocytes in an insect: calliphora erythrocephala.		1972	4348054
in vivo effects of -amanitin on rna synthesis in calliphora erythrocephala.		1972	5049470
ultrastructural changes during transition of larval to adult intersegmental muscle at metamorphosis in the blowfly calliphora erythrocephala. i. dedifferentiation and myoblast fusion.		1972	5021251
ultrastructural changes during transition of larval to adult intersegmental muscle at metamorphosis in the blowfly calliphora erythrocephala. ii. the formation of adult muscle.		1972	5021252
microspectrophotometry of arthropod visual screening pigments.	absorption spectra of visual screening pigments obtained in vitro with a microspectrophotometer using frozen sections are given for the insects musca domestica, phormia regina, libellula luctuosa, apis mellifera (worker honeybee only), drosophila melanogaster (wild type only) and the arachnids lycosa baltimoriana and lycosa miami. the spectral range covered is 260-700 nm for lycosa and drosophila and 310-700 nm for the remainder of the arthropods. a complete description of the instrumentation is ...	1972	4623852
[a new type of blood cell (the thrombocytoid) in calliphora erythrocephala].		1972	4628303
[3-dehydroecdyson, a metabolic product of ecdysons in the blowfly calliphora erythrocephala meigen].		1972	4649850
[histochemical investigations of the eye of the blowfly calliphora erythrocephala meig. ii. nucleosidephosphatases, thiaminepyrophosphatase, nonspecific esterase, and cholinesterase].		1972	4262566
brush-border formation in the midgut of an insect, calliphora erythrocephala meigen. the formation of microvilli in the midgut during embryonic development.		1972	4334735
lysosomes in the midgut of calliphora erythrocephala meigen.		1972	5042777
tyrosine metabolism in the blowfly larva, calliphora erythrocephala.		1971	5116548
the isolation and properties of the protein calliphorin.	1. a procedure for the isolation of the protein calliphorin from larvae and pupae of the blowfly calliphora erythrocephala is described. 2. the calliphorin preparation shows a single component in the ultracentrifuge at ph6.3 and gives a single band when stained for protein after agar-gel or starch-gel electrophoresis at ph6.3 or 8.6. immunoelectrophoresis yields only one arc, associated with the stained spot, to a rabbit antiserum known to react with 13 other soluble components of calliphora pup ...	1971	5158506
occurence of a metabolite related to pupation of the blowfly calliphora erythrocephala meig.		1971	5317427
ultrastructure of the midgut epithelial cells in the fly calliphora erythrocephala.		1971	4329464
[histochemical studies on the eye of the blowfly calliphora erythrocephala meig. i. atp-ase, acid phosphatase, alkaline phosphatase and glucose-6-phosphatase].		1971	4332957
ultrastructural changes in sarcosomes after exposure of adult calliphora erythrocephala to lethal and sub-lethal high temperatures.		1971	4939030
esterase activity of the posterior midgut of the female blowfly, calliphora erythrocephala.		1971	5094247
phenol oxidase activity in the larva of the blowfly calliphora erythrocephala.		1971	5001731
changes in the functional efficiency of flight muscle sarcosomes during heat death of adult calliphora erythrocephala.		1971	4255709
fine structure of the corpus allatum of the female blow-fly calliphora erythrocephala.		1970	5471201
[insect organ culture. influence of ringed gland and cerebral complex on the differentiation of prepupal ovary of calliphora erythrocephala].		1970	5489260
cibarial stretch receptors in the tsetse fly (glossina austeni) and the blowfly (calliphora erythrocephala).		1970	5417534
[tyrosine metabolism in insects. xviii. activity of phenylalanine-4-hydroxylase and the n-acetyldopamine glucoside-forming system in vivo during the development of calliphora erythrocephala meigen].		1970	5451275
pupation inhibiting factor in the larva of the blowfly calliphora erythrocephala.		1970	16058735
the fine structure of haltere sensilla in the blowfly calliphora erythrocephala (meig.), with scanning electron microscopic observations on the haltere surface.	the dipteran haltere incorporates large numbers of regularly disposed mechanoreceptors providing the sensory input enabling the vibrating haltere to function as a gyroscopic organ of equilibrium. campaniform sensilla of the basal and scapal regions have been investigated by light and transmission electron microscopy, and these observations are augmented by scanning electron studies of the cuticle overlying the groups of sensilla. each sensillum possesses a specialized fan-shaped terminal contain ...	1969	18631479
puparium formation in flies: contraction to puparium induced by ecdysone.	larvae of the fly calliphora erythrocephala (meigen) were deprived surgically of their ring glands at an age prior to the appearance of ecdysone in the blood, and then injected with ecdysone. they contracted into the typical barrel-shaped puparium, before the onset of tanning. this proved that ecdysone controls the puparium contraction as well as tanning.	1969	17810533
control of the medial neurosecretory cells by the corpus allatum in calliphora erythrocephala.		1969	5765446
[survival and testicular differentiation of calliphora erythrocephala (insecta-diptera) in organotypic culture].		1969	5394049
[development of adenosine triphosphate levels during post-embryonic development of calliphora erythrocephala].		1969	4983251
experimentally induced release of a neurohormone influencing hemolymph trehalose level in calliphora erythrocephala (diptera).		1969	5769934
[investigations with polarized light on the eye of calliphora erythrocephala (meig)].		1969	5787553
the metabolism of the insecticide carbaryl (1-naphthyl n-methylcarbamate) by fat body of the blowfly larva calliphora erythrocephala.	1. carbaryl is metabolized more rapidly by fat body of the blowfly larva than by gut, muscle, cuticle or haemolymph. 2. metabolism of carbaryl by the fat body is affected by the age of the larva, the ph of the incubation medium, and the concentration of magnesium chloride in the incubation medium. 3. chloramphenicol, 2,4-dinitrophenol and 5-dimethylamino-6-nitro-1,3-benzodioxole (a carbaryl synergist) inhibit carbaryl metabolism by the fat body. 4. subcellular fractionation of the fat body indic ...	1969	5801293
on the mechanism of hormone action. 13. stimulating effects of ecdysone, juvenile hormone and ions on rna synthesis in fat body cell nuclei from calliphora erythrocephala isolated by a filtration technique.		1969	5824453
the neurosecretory system of the adult calliphora erythrocephala. iv. a histological study of the corpus cardiacum and its connections with the nervous system.		1969	4190435