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排序方式: 共有78条查询结果,搜索用时 937 毫秒
1.
2.
Dr. R. G. Foster G. C. Panzica D. M. Parry C. Viglietti-Panzica 《Cell and tissue research》1988,253(2):327-335
Summary Immunocytochemistry was used to determine if photoperiod and/or sex have any effect on the pattern of the luteinizing hormone-releasing hormone (LHRH) system in the brain of the Japanese quail. Immunopositive perikarya were found within three major areas of the brain: the rostral paraolfactory lobe, the preoptic, and the septal region. A quantitative analysis of LHRH cell numbers was performed on male and female quail after two photoperiodic treatments: sexually mature birds exposed to 24 weeks of 20 h light: 4 h darkness (20L4D), and birds with a regressed reproductive system (induced by transfer from a photoregime of 20L4D to 25 short days of 8L16D). Two-way analysis of variance showed that short-day males display significantly (p < 0.05) more immunopositive perikarya (607 + 134) than long-day males (291 + 114), short-day females (293 + 103) or long-day females (330 + 92). The density of LHRH-immunoreactive nerve fibres and the intensity of the immunostaining in the median eminence were always greater in long-day sexually mature quail (male and female) than in animals exposed to 25 days of 8L16D. These results demonstrate that the LHRH system of the quail is influenced by photoperiod and mirrors sexual differentiation. 相似文献
3.
Comparative chemical anatomy of the brain: concepts and methods 总被引:1,自引:0,他引:1
A Fasolo G C Panzica C Viglietti-Panzica T Renda L D'Este 《Basic and applied histochemistry》1988,32(1):15-30
The study of neuropeptides represents an appropriate playground for comparative and evolutionary research. Comparative analysis can give insight into the conservative pattern of intercellular transmission molecules, possibly bound both to some evolutionary antiquity and to cellular constraints. In the same time it can teach us how modulation has occurred at molecular, cellular, multicellular levels in order to give the species-specific functional organization. Using some examples from vertebrate central neurons system (CNS) immunocytochemical analyses, the results so far obtained suggest the rise of a new comparative chemical neuroanatomy. The rationale of "what" and "why" we are comparing is, however, needed in order to understand constancy, heterogeneity or else trends toward complexity in the distribution of neuropeptides. 相似文献
4.
N. Aste C. Viglietti-Panzica A. Fasolo C. Andreone H. Vaudry G. Pelletier G. C. Panzica 《Cell and tissue research》1991,265(2):219-230
Summary In the present study, we have demonstrated, by means of the biotin-avidin method, the widespread distribution of neuropeptide Y (NPY)-immunoreactive structures throughout the whole brain of the Japanese quail (Coturnix coturnix japonica). The prosencephalic region contained the highest concentration of both NPY-containing fibres and perikarya. Immunoreactive fibres were observed throughout, particularly within the paraolfactory lobe, the lateral septum, the nucleus taeniae, the preoptic area, the periventricular hypothalamic regions, the tuberal complex, and the ventrolateral thalamus. NPY-immunoreactive cells were represented by: a) small scattered perikarya in the telencephalic portion (i.e. archistriatal, neostriatal and hyperstriatal regions, hippocampus, piriform cortex); b) medium-sized cell bodies located around the nucleus rotundus, ventrolateral, and lateral anterior thalamic nuclei; c) small clustered cells within the periventricular and medial preoptic nuclei. The brainstem showed a less diffuse innervation, although a dense network of immunopositive fibres was observed within the optic tectum, the periaqueductal region, and the Edinger-Westphal, linearis caudalis and raphes nuclei. Two populations of large NPY-containing perikarya were detected: one located in the isthmic region, the other at the boundaries of the pons with the medulla. The wide distribution of NPY-immunoreactive structures within regions that have been demonstrated to play a role in the control of vegetative, endocrine and sensory activities suggests that, in birds, this neuropeptide is involved in the regulation of several aspects of cerebral functions.Abbreviations
AA
archistriatum anterius
-
AC
nucleus accumbens
-
AM
nucleus anterior medialis
-
APP
avian pancreatic polypeptide
-
CNS
centrai nervous system
-
CO
chiasma opticum
-
CP
commissura posterior
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CPi
cortex piriformis
-
DIC
differential interferential contrast
-
DLAl
nucleus dorsolateralis anterior thalami, pars lateralis
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DLAm
nucleus dorsolateralis anterior thalami, pars medialis
-
E
ectostriatum
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EW
nucleus of Edinger-Westphal
-
FLM
fasciculus longitudinalis medialis
-
GCt
substantia grisea centralis
-
GLv
nucleus geniculatus lateralis, pars ventralis
-
HA
hyperstriatum accessorium
-
Hp
hippocampus
-
HPLC
high performance liquid chromatography
-
HV
hyperstriatum ventrale
-
IF
nucleus infundibularis
-
IO
nucleus isthmo-opticus
-
IP
nucleus interpeduncularis
-
IR
immunoreactive
-
LA
nucleus lateralis anterior thalami
-
LC
nucleus linearis caudalis
-
LFS
lamina frontalis superior
-
LH
lamina hyperstriatica
-
LHRH
luteinizing hormone-releasing hormone
-
LoC
locus coeruleus
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LPO
lobus paraolfactorius
-
ME
eminentia mediana
-
N
neostriatum
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NC
neostriatum caudale
-
NPY
neuropeptide Y
-
NIII
nervus oculomotorius
-
NV
nervus trigeminus
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NVI
nervus facialis
-
NVIIIc
nervus octavus, pars cochlearis
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nIV
nucleus nervi oculomotorii
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nIX
nucleus nervi glossopharyngei
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nBOR
nucleus opticus basalis (ectomamilaris)
-
nCPa
nucleus commissurae pallii
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nST
nucleus striae terminalis
-
OM
tractus occipitomesencephalicus
-
OS
nucleus olivaris superior
-
PA
palaeostriatum augmentatum
-
PBS
phosphate-buffered saline
-
POA
nucleus praeopticus anterior
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POM
nucleus praeopticus medialis
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POP
nucleus praeopticus periventricularis
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PP
pancreatic polypeptide
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PYY
polypeptide YY
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PVN
nucleus paraventricularis magnocellularis
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PVO
organum paraventriculare
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R
nucleus raphes
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ROT
nucleus rotundus
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RP
nucleus reticularis pontis caudalis
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Rpc
nucleus reticularis parvocellularis
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RPgc
nucleus reticularis pontis caudalis, pars gigantocellularis
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RPO
nucleus reticularis pontis oralis
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SCd
nucleus subcoeruleus dorsalis
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SCv
nucleus subcoeruleus ventralis
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SCNm
nucleus suprachiasmaticus, pars medialis
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SCNl
nucleus suprachiasmaticus, pars lateralis
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SL
nucleus septalis lateralis
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SM
nucleus septalis medialis
-
Ta
nucleus tangentialis
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TeO
tectum opticum
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Tn
nucleus taeniae
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TPc
nucleus tegmenti pedunculo-pontinus, pars compacta
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TSM
tractus septo-mesencephalicus
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TV
nueleus tegmenti ventralis
-
VeL
nucleus vestibularis lateralis
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VLT
nucleus ventrolateralis thalami
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VMN
nucleus ventromedialis hypothalami
A preliminary report of this study was presented at the 15th Conference of European Comparative Endocrinologists, Leuven, Belgium, September 1990 相似文献
5.
Summary The early appearance of catecholaminergic neurons, as revealed by fluorescence histochemistry, has been determined in the central nervous system of quail, pheasant, and pigeon embryos. The first neuronal assemblies displaying specific fluorescence are the locus coeruleus and the nucleus subcoeruleus ventralis. Taking into account the differences in the length of the prehatching period of these three avian species, the first catecholamine-containing neurons appear earlier in the precocial quail and pheasant than in the altricial pigeon.Investigation supported by grants from the Italian National Research Council (CNR) No 83.02058.04 (R.G.) and No 83.00492.04 (G.C.P.). 相似文献
6.
Dr. G. C. Panzica G. Malacarne A. De Bernochi C. Viglietti-Panzica 《Cell and tissue research》1985,240(1):169-174
Summary Testosterone and corticosterone, administered in doses of 0.5 mg/day for two weeks to three-day-old male chickens, induced alterations in the distributional pattern and in the number of synapses in the rostral neuropil of the hypothalamic paraventricular nucleus. This avian nucleus is a target area for both above-mentioned hormones and also one of the most important centers involved in the regulation of behavioral patterns related to reproduction. Testosterone increased the number of synapses in the rostral paraventricular nucleus, while corticosterone altered their distributional pattern causing an increase in type-B terminals; according to morphological criteria the latter are regarded to represent aminergic endings. Similar results were induced by simultaneous administration of both testosterone and corticosterone. Precocious sexual behavior was also provoked by double treatment.Preliminary results have been presented on the occasion of the 5th ENA meeting (Liège, Belgique, Sept. 1981) and the 1st Italian Meeting of Cell Biology (Rimini, Italy, April 1982)This study was supported by CNR bilateral grants (82.00215.04 & 83.00492.04), MPI 40% and European Training Program in Brain and Behaviour Researchs (twinning grant) 相似文献
7.
Summary In the rostral hypothalamus of the domestic fowl, the magnocellular neurosecretory nuclei show a peculiar differentiation. Golgi studies of the supraoptic and paraventricular nuclei of the fowl reveal at least two major cell types: 1) large multipolar neurons, and 2) small interneurons. Golgi impregnations provide a detailed cytoarchitectural picture of the large-sized cells; the latter may well correspond to the neurosecretory cells demonstrated in the same regions by selective staining, and immunocytochemical and electron microscopical techniques.Electron microscopically, neuronal perikarya are observed to contain variable amounts of neurosecretory granules (100–200 nm in diameter; mean diameter of 160 nm) scattered throughout the cytoplasm. The diameters of these granules do not differ statistically in the two principal nuclear areas examined. The perikarya of these neurons display only a few axosomatic synapses containing electron-lucent and dense-cored vesicles (70–90 nm in diameter). Numerous nerve terminals of this type also end on the dendritic ramifications in the surrounding neuropil. 相似文献
8.
GC Wood 《New Zealand journal of zoology.》2013,40(3):186-195
Abstract The Westland petrel (Procellaria westlandica) is an endemic New Zealand species and one of the very few burrowing seabird species still breeding on mainland New Zealand. It nests only on a series of coastal ridgelines near to Punakaiki on the West Coast of the South Island. Between 2002 and 2005, surveys were undertaken at 28 of the 29 known colonies. The area occupied by the colonies was 73 ha; most colonies had fewer than 50 burrows, but six colonies had 201–500 burrows and four colonies had more than 1000 burrows. We find that the current breeding range of Westland petrel and the location of individual colonies are similar to those reported in both the 1950s and 1970s. Based on total burrow counts at 28 colonies and burrow occupancy rates determined by annual monitoring, the annual breeding population is estimated to be between 2954 and 5137 breeding pairs. 相似文献
9.
Abstract Purine analogues and derivatives exhibit a broad range of pharmacological activities and are used in the chemotherapy of cancer, parasitic and viral infections, and for the suppression of immune responses. Undoubtedly, this wide range of biological activities reflect an equally wide number of biochemical sites of action, one of which is the purine de novo pathway. New agents which can either serve as inhibitors of enzymes involved in this pathway or as substrates are continually sought. The unique series of nucleosides described herein should meet these desired needs. The synthesis of 1involved glycosylation of a suitably 4,5-disubstituted imidazole and subsequent cyclization of the imidazole nucleoside so formed to the imidazo[4,5-d]pyridazine nucleoside. Such methodology was successfully employed1,2 in the preparation of certain 4,7-disubstituted imidazo[4,5-d]pyridazine nucleosides. Chlorination of 1furnished 4-chloro-1-(2,3,5-tri-O-acetyl-β-D-ribo-furanosyl)imidazo[4,5-dlpyridazine (2) in 80% yield. This versatile intermediate can now serve as a precursor to a variety of 4-substituted imidazo[4,5-d]pyridazine nucleosides. 相似文献
10.