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Acta biochimica et biophysica Hungarica最新文献

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Correlation dimension changes of the EEG during the wakefulness-sleep cycle. 醒-睡周期脑电图相关维数变化。
Acta biochimica et biophysica Hungarica Pub Date : 1993-02-01 DOI: 10.1016/0167-8760(93)90209-8
M. Molnár, J. E. Skinner
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引用次数: 13
Theorems speaking for the asymmetry of all animal brains. 证明所有动物大脑不对称的定理。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
E Lábos
{"title":"Theorems speaking for the asymmetry of all animal brains.","authors":"E Lábos","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In random graph theory it has been proved that with the increasing size of a graph, the proportion of the non-symmetric graphs increases and this class becomes the dominant one while the number of symmetric cases turns to be 'negligible'. Thus the asymmetry (AS) is the generic property. Since nervous systems are representable by graphs or better with special digraphs, the networks, it follows that the brains are asymmetric in a strong sense according to which all cells are distinguishable from each other alone by their internal connections. Such a consequence holds perfectly only if a random evolution or generation of neural networks is supposed. Thus apparent symmetries have to come from heavily controlled (i.e. non random) ontogenetic processes. At the present time the possible total cellular heterogeneity of the various nervous systems has still unclear functional implications. In small nervous systems the odd number of neurons alone is neither a sufficient nor a necessary condition of the asymmetry in the outlined sense.</p>","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"105-9"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13005957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hunger- and satiety-related changes of amygdaloid catecholamines: a microdialytic study in freely moving rats. 饥饿和饱腹感相关的杏仁核儿茶酚胺变化:自由运动大鼠的微透析研究。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
A Hajnal, I Abrahám, I Vida, Z Karádi, L Lénárd
{"title":"Hunger- and satiety-related changes of amygdaloid catecholamines: a microdialytic study in freely moving rats.","authors":"A Hajnal,&nbsp;I Abrahám,&nbsp;I Vida,&nbsp;Z Karádi,&nbsp;L Lénárd","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"67-9"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13007200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Regeneration of dorsal column pathways in peripheral bypass autografts implanted in the spinal cord of adult rats. 成年大鼠脊髓外周自体旁路移植术中背柱通路的再生。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
E Knyihár-Csillik, A Török, S Mohtasham, B Csillik
{"title":"Regeneration of dorsal column pathways in peripheral bypass autografts implanted in the spinal cord of adult rats.","authors":"E Knyihár-Csillik,&nbsp;A Török,&nbsp;S Mohtasham,&nbsp;B Csillik","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Sciatic nerves were implanted into the cervical spinal cord as bypass autografts. Nerve fibers growing into the bypass were shown to be authentic dorsal column axons. Ingrowth of axons is dependent of intact basal laminae in the autograft.</p>","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"97-103"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13007201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Calretinin ontogenesis in the developing DRG of chicken. Calretinin在鸡DRG发育中的个体发生作用。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
E Király, M R Celio
{"title":"Calretinin ontogenesis in the developing DRG of chicken.","authors":"E Király,&nbsp;M R Celio","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"95-6"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13007197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of electrophoretically applied neurochemicals on activity of extrapyramidal and limbic neurons in the rat. 电泳应用的神经化学物质对大鼠锥体外系和边缘神经元活性的影响。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
A Czurkó, B Faludi, I Vida, C Niedetzky, A Hajnal, Z Karádi, L Lénárd
{"title":"Effect of electrophoretically applied neurochemicals on activity of extrapyramidal and limbic neurons in the rat.","authors":"A Czurkó,&nbsp;B Faludi,&nbsp;I Vida,&nbsp;C Niedetzky,&nbsp;A Hajnal,&nbsp;Z Karádi,&nbsp;L Lénárd","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"57-60"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12853600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vimentin immunopositivity in the brain of the adult frog. 成年蛙脑内波形蛋白免疫阳性。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
M Kálmán
{"title":"Vimentin immunopositivity in the brain of the adult frog.","authors":"M Kálmán","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"89-93"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13007192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The mathematical analysis of spontaneous and induced potentials in neural cultures. 神经培养物中自发电位和诱导电位的数学分析。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
V Jánossy, K Krinizs, B Lukács, A Rácz, A Gyévai, E Madarász
{"title":"The mathematical analysis of spontaneous and induced potentials in neural cultures.","authors":"V Jánossy,&nbsp;K Krinizs,&nbsp;B Lukács,&nbsp;A Rácz,&nbsp;A Gyévai,&nbsp;E Madarász","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We compare the power spectra of activities of neural cultures from the cortex and spinal cord of embryonic rat. The measurements were made in a microelectrode culture chamber by non-invasive methods. The data suggest that the fundamental frequencies of cortical and spinal cultures significantly differ, while the general patterns of the spectra are rather similar.</p>","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"83-8"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13007194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single-channel analysis of Pb2+ modified steady-state Na-conductance in snail neurons. Pb2+修饰蜗牛神经元稳态na电导的单通道分析。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
O N Osipenko, T Kiss
{"title":"Single-channel analysis of Pb2+ modified steady-state Na-conductance in snail neurons.","authors":"O N Osipenko,&nbsp;T Kiss","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Patch-clamp technique was used in order to study properties of the steady-state Na-channel in snail neurons. Experiments revealed that Pb-ions, applied extracellularly, close these channels, which are preferably in open state at the resting membrane potential. Elementary currents have a linear current-voltage (I-V) relationship with single channel conductance of 14 pS between -100 and -40 mV both in control saline and in the presence of 50 microM Pb in the pipette. Pb-ions decreased the mean open and increased the mean closed time. It was found that both open and closed times showed little voltage-dependence, however the probabilities of the open and closed times proved to be voltage-dependent. Open and closed time histograms were fitted by one exponential, therefore first order kinetics were assumed for the blocking effect of Pb2+ at the single channel level.</p>","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"39-49"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12834507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Drugs acting at calcium channels can influence the hypnotic-anesthetic effect of dexmedetomidine. 作用于钙通道的药物可影响右美托咪定的催眠麻醉效果。
Acta biochimica et biophysica Hungarica Pub Date : 1991-01-01
G Horváth, M Kovács, M Szikszay, G Benedek
{"title":"Drugs acting at calcium channels can influence the hypnotic-anesthetic effect of dexmedetomidine.","authors":"G Horváth,&nbsp;M Kovács,&nbsp;M Szikszay,&nbsp;G Benedek","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The effects of chronic administration of the calcium channel antagonist verapamil on the anesthetic effects of a novel specific alpha 2-receptor agonist (dexmedetomidine) were studied in rats. It is presumed that this agonist acts on both pre- and postsynaptic alpha 2-adrenoceptors. To determine whether the central postsynaptic receptors are involved in the anesthetic interactions between these drugs, rats were treated with DSP-4 to deplete endogenous norepinephrine. Loss of the righting reflex was used to determine the presence of anesthesia and the duration of hypnosis. Chronic treatment with verapamil (1 or 5 mg/kg) significantly increased the duration of the hypnotic-anesthetic effect of dexmedetomidine. Neither acute treatment with verapamil nor the calcium channel agonist BAY K 8644 (0.5 or 1 mg/kg) influenced the dexmedetomidine-induced hypnosis after DSP-4 treatment. The results seem to support the idea that the hypnotic action of dexmedetomidine can be affected via modulation of the transmembraneous calcium movement in the central nervous system. Further, the data on catecholamine-depleted rats with DSP-4 suggest that the interactions between verapamil and dexmedetomidine may be mediated through presynaptic or homoreceptors on noradrenergic neurons.</p>","PeriodicalId":77479,"journal":{"name":"Acta biochimica et biophysica Hungarica","volume":"26 1-4","pages":"75-81"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12853603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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