Histochemical and cytochemical observations on the acetylcholinesterase (AChE) localization in the superior cervical ganglion (SCG) after preganglionic sympathectomy of the neonatal rat.

Results of histochemical and cytochemical reactions show that after the section of preganglionic nerve trunk performed in newborn animals, the appearance and the individual increase in AChE activity in non-innervated nerve cells follow the pattern of normally innervated ganglion cell.     

Histochemical and cytochemical observations on the acetylcholinesterase (AChE) localization in the superior cervical ganglion (SCG) after preganglionic sympathectomy of the neonatal rat

Summary Results of histochemical and cytochemical reactions show that after the section of preganglionic nerve trunk performed in newborn animals, the appearance and the individual increase in AChE activity in non-innervated nerve cells follow the pattern of normally innervated ganglion cell.     

Localisation of acetylcholinesterase in rat myotubes in the presence of beta-endorphin and beta-endorphin-(1-27)

In rat embryo skeletal myotubes, acetylcholinesterase is present, as multiple forms, and can be detected in deposits at the cell surface. Myotubes cultured in the presence of beta-endorphin, exhibit an increased predominance of the globular (precursor) forms of the enzyme, which are largely restricted to intracellular sites associated with nuclei. In the presence of beta-endorphin-(1-27), the relative proportions of the different forms of acetylcholinesterase is similar to that seen in the controls, but the enzyme is intracellular and has a characteristic focal localisation in the myotube.     

Scanning electron microscope observations of the canaliculi in the rat pineal gland.

The scanning electron microscope has shown rich ramifications of the parenchymal canaliculi forming a three-dimensional network of anastomosing intercellular spaces in the rat pineal gland. Every pineal cell seems to be in contact with this channel system. An abundance of cellular processes can be found within the canaliculi which may play an important role in the histophysiology of the pineal body.     

Catecholamine-containing nerve fibres in the hind-gut of the crayfishAstacus astacus L. (Crustacea,decapoda)

Zusammenfassung Katecholamin enthaltende Nervenfasern im Enddarm vonAstacus astacus (L.) werden mit Hilfe vonFalcks undHillarps spezifischer Fluoreszenzmethode gezeigt. Die Fasern, die eine grüne Fluoreszenz abgeben, wurden in Nervenplexen der zirkulären und der längsgehenden Muskelschichten des Darmes beobachtet. Es wird angenommen, dass diese Fluoreszenz durch Noradrenalin zustande kommt.

---

---

The research reported in this document has been sponsored by the Swedish Natural Science Research Council under grant No. 99-35.     

Increase in muscle fibres in the lateralis muscle (white portion) of Mugilidae (Pisces,Teleostei)

Summary A cycle of postlarval growth is described in the white portion of the lateralis muscle of Mugilidae. The cycle was identified histochemically by the myosin-ATPase reaction.This work was supported by a CNR grant (Oceanografia e fondi marini project).     

Action of somatostatin and 3 analogs on external pancreatic secretion in the rat]

The effect os somatostatin (SS) and of its analogs D Trp 8-SS and Asn 5-SS was studied upon the external pancreatic secretion of the Rat after stimulation by 2 deoxy-D-glucose. The secretion of sodium and bicarbonate was similarly inhibited by all four peptides. The analog D Trp 8-SS was more effective in inhibiting pancreatic protein excretion.     

Electron microscopic observations on the granular vesicles in the ciliary ganglion of the rat

Zusammenfassung Im Ganglion ciliare normaler ausgewachsener Ratten werden elektronenmikroskopisch granulierte oder «dense core» Vesikula von etwa 900 bis 1200 Å Durchmesser festgestellt (in Nervenfasern, im Zytoplasma von Nervenzellen und in Präsynapsen). Reserpin (Serpasil^®, Ciba) verursachte keine nennenswerte Änderung in Zahl oder Lokalisation der Vesikula, hingegen eine Abnahme ihrer Kerndichte.

---

Abbreviations used in the figures A Axon - DCV Dense core vesicle=Granular vesicle - M Mitochondrion - NC Neuronal cytoplasm - NE Nerve ending - NG Neurosecretory granule - PST Presynaptic terminal - S Synapse     

Extravasation of blood cells in and around the pituitary ofAnabas scandens (Cuvier)

Zusammenfassung Es wurden Gruppen von Blutzellen innerhalb und in der Umgebung der Hypophyse vonAnabas scandens und besonders in der Mesoadenohypophyse gefunden. Dies fällt auf, da die Mesoadenohypophyse im allgemeinen nicht reich mit Gefässen versorgt ist. Die Gefässversorgung dieser Stelle zeigt, dass das Sekret direkt von der Mesoadenohypophyse ins Blut übergeht, während die Anhäufung von Blutzellen in der Hypophyse pathologische sein dürfte.     

Adrenergic nerves and mast cells after skin freezing. A hypothesis based on fluorescence microscope observations in the rat

Summary After freezing and thawing of rat skin, degranulation and disappearance of mast cell fluorescence became apparent in the skin up to 1 h after thawing. Gradual disappearance of catecholamines from the adrenergic nerves of the injured area occurred during the 1st 24 h. Both mast cells and adrenergic nerves may play a role in tissue destruction after freezing injury.Supported by grants from the Research Foundation of Oy. Orion, the Paolo Foundation and the Finish Medical Foundation.     

Fate of cartilage cells in limb regeneration in the axolotl (Ambystoma mexicanum)

Résumé Nous avons suivi de près, pendant la régénération, le comportement du cartilage triploïde greffé dans les membres diploïdes en nous servant du nombre nucléolaire comme marque cellulaire. La greffe de cartilage a fourni des cellules de cartilage au régénérat, mais elle n'a pas contribué à la découverte de cellules d'autres espèces.     

The presence of monoamines in the nervous system ofPeripatopsis (Onychophora)

Summary Preliminary observations of formaldehyde-induced fluorescence support the suggestion that monoamines such as noradrenaline, dopamine and 5-hydroxytryptamine are transmitter agents in the central nervous system of Onychophora.Acknowledgments. We wish to thank Dr M. Fillenz for valuable advice and for generously enabling this work to be carried out, and we are indebted to Dr V. van der Lande for material.     

Linear regression forecasting in the presence of ar(1) disturbances

This paper is concerned with time-series forecasting based on the linear regression model in the presence of AR(1) disturbances. The standard approach is to estimate the AR(1) parameter, ρ, and then construct forecasts assuming the estimated value is the true value. We introduce a new approach which can be viewed as a weighted average of predictions assuming different values of ρ. The weights are proportional to the marginal likelihood of ρ. A Monte Carlo experiment was conducted to compare the new method with five more conventional predictors. Its results suggest that the new approach has a distinct edge over existing procedures.