Showing papers by "University of Florence published in 1968"
TL;DR: The experiments support the hypothesis that amphetamine stimulates cortical ACh output by acting on catecholamine nerve terminals which make synaptic connection with cholinergic neurons in the rostral part of the brain.
96 citations
01 Jan 1968
TL;DR: In this paper, an indagine climatica is condotta esaminando soprattutto le variazioni temporali e spaziali della temperatura e delle precipitazioni mediante l'utilizzazione dei dati di 43 stazionis termometriche and 222 stazionsi pluviometriche, per periodi piu o meno lunghi, da 1920 al 1965.
Abstract: RIASSUNTO Il clima e certamente il fattore che piu determina i lineamenti del paesaggio vegetale di una data regione. Pur con tutte le limitazioni del caso, l'esame delle correlazioni fra clima e vegetazione puo essere tentato mediante l'utilizzazione dei dati climatici rilevati convenzionalmente dall'uomo in stazioni diverse di una data regione. La Sardegna, al centro del Mediterraneo occidentale, e una unita geografica che ben si presta, per il suo isolamento, per esaminare le correlazioni esistenti fra il clima e la vegetazione di un territorio. Sulla base dei dati climatici e vegetazionali acquisiti sull'isola e stato quindi effettuato un tentativo di inquadramento fitoclimatico della regione sarda. L'indagine climatica e stata condotta esaminando soprattutto le variazioni temporali e spaziali della temperatura e delle precipitazioni mediante l'utilizzazione dei dati di 43 stazioni termometriche e 222 stazioni pluviometriche che hanno funzionato, per periodi piu o meno lunghi, da 1920 al 1965. Una cer...
79 citations
TL;DR: In this paper, the authors proposed new vibrational assignments for maleic and succinic anhydrides and their deuteroderivatives, based on the band dichroism of the crystal spectra in polarized light.
36 citations
01 Jan 1968
35 citations
31 citations
TL;DR: Alginic acid is proposed as a new stationary phase for TLC in this article, and the effects of the distance moved by the solvent front, temperature, hydrogen ion concentration of the eluents and the thickness of the layers on the R F values of some common elements have been extensively investigated.
31 citations
TL;DR: In this article, the authors derived the theoretical current-time curves at constant potential on spherical and plane electrodes with the assumption that the depolarizer and the product of the electrode reaction are adsorbed on the electrode surface according to linear isotherms.
30 citations
TL;DR: A case is reported of meningitis due to Neisseria catarrhalis in a 14‐month‐old infant and the patient recovered after penicillins, erythromycin and chloramphenicol therapy.
Abstract: Summary
A case is reported of meningitis due to Neisseria catarrhalis in a 14-month-old infant. The organism was cultured from the spinal fluid and throat. The patient recovered after penicillins, erythromycin and chloramphenicol therapy.
29 citations
TL;DR: The changes in level of activity during the germination of wheat seedling in the dark have been investigated with enzymes of glycolysis, 2 enzymes of the pentose phosphate shunt, 2 of the tricarboxylic acid cycle, 3 of amino acid metabolism and acid phosphatase.
Abstract: The changes in level of activity during the germination of wheat seedling (Triticum durum) in the dark have been investigated with 4 enzymes of glycolysis, 2 enzymes of the pentose phosphate shunt, 2 of the tricarboxylic acid cycle, 2 of amino acid metabolism and acid phosphatase. For some enzymes, which function in photosynthesis (fructose diphosphate aldolase, glyceraldehyde phosphate dehydrogenase NADP dependent), the level of activity was influenced by the presence of light.
25 citations
TL;DR: The operability among 573 roses of carcinoma of the corpus was 88.3 per cent and the survival rate for more than 5 years among 112 simple vaginal hyterectomies was 73.2 per cent.
23 citations
TL;DR: Six species of conifers were investigated for their lipid content and malate synthase and isocitrate lyase level and the fatty acid composition of the triglyceride fraction and the correlation between lipid content of germinating seed with the presence of the glyoxylate cycle was confirmed.
Abstract: The high level of lipids in seeds of some species of conifers suggested that the glyoxylate cycle might have a role in conifer seed metabolism.Six species (Pinus pinea, Pinus pinaster, Pinus canariensis, Pinus strobus, Abies alba, and Cupressus sempervirens) were investigated for their lipid content and malate synthase and isocitrate lyase level. The fatty acid composition of the triglyceride fraction was also investigated. The correlation between lipid content of germinating seed with the presence of the cycle was confirmed. The enzymes of the glyoxylate cycle were not detected in Cupressus sempervirens where the lipid content is very low.
TL;DR: In this article, the preparation and properties of nine complexes formed by the quadridentate ligand tris(2-methylthioethyl)amine, TSN, and the halides or thiocyanate of cobalt (II), nickel(II), copper(II, and zinc(II) have been studied.
TL;DR: In this paper, the R F values of 41 elements, some in two oxidation states, have been determined by TLC on alginic acid and the effect of the nature and concentration of the acids employed as eluents was extensively investigated.
TL;DR: In this article, the mixing angles of the baryon wave function were derived under axial charges and the results obtained from their saturation were in good agreement with the known electromagnetic properties of nucleons.
TL;DR: The concept of VNS, which had been foreseen many years ago in attempts at interpretation of capillary fragility and pain in ischemic muscular, was proposed in more precise terms to account for the pathogenesis of migraine headache episodes-a condition in which pain, nervous disorders, and vascular abnormalities are extant.
Abstract: Whenever blood extravasates into the brain or subarachnoid spaces, regardless of the cause, the event is followed by typical clinical manifestations, such as depression of psychic activity, confusion, stupor, and coma. The two most common instances of this kind, occurring spontaneously, are cerebral hemorrhage and subarachnoid hemorrhage. In the latter case, the picture of psychic depression noted above is associated with a characteristic, stabbing headache, which occurs early in the course of subarachnoid bleeding and is followed by evidence of meningeal irritation, eventually representing a full-blown picture of aseptic meningitis. Nature offers numerous examples of diversified phenomena stemming from a single causative factor, both because the factor itself may have more actions than one, and because the structures on which it acts are themselves diversified and therefore react differently. An important example of such a factor is bradykinin, a polypeptide that dilates the blood vessels and increases their permeability, thus causing congestion. edema, and inflarnmation.l.2 The same substance also acts directly on sensitive receptors, thereby causing ~ a i n , ~ . ~ and on nerve synapses and other cerebral structures, where it interferes with normal function and causes nervous disorders.5-8 This bipolar activity of bradykinin, and the similar action of other substances involved in problems of pathophysiology, such as 5-hydroxytryptamine, histamine, and substance P, justifies the grouping of all these substances under the name of vaso-neuroactive substances (VNS) -an appellation admittedly arbitrary on biological grounds but eminently serviceable at the clinical level.g In normal conditions, VNS are either devoid of apparent actions or perform physiological functions. On the other hand, they are capable of exerting intense and prolonged actions on nervous and vascular receptors and may therefore be regarded as pathogenic agents, when their concentration at any given point is abnormally high. The most common cause of such increased concentrations is increased liberation of VNS, often associated with reduced inactivation of the principles thus liberated. The concept of VNS, which had been foreseen many years ago in attempts at interpretation of capillary fragility and pain in ischemic muscular ~ o r k l O ' ~ was proposed in more precise terms to account for the pathogenesis of migraine headache episodes-a condition in which pain, nervous disorders, and vascular abnormalities are extant.I4J5 Recently it was postulated that an abnormally high concentration of bradykinin in the cerebrospinal fluid might be responsible, at least in the initial stage, for certain symptoms of subarachnoid hemorrhage.l8J7 As we shall see further on, the same concept is as applicable to hemorrhages occurring within the brain itself as in the common clinical event, cerebral stroke. In more generic terms it may be suggested that intracranial hemorrhage (either
TL;DR: In this paper, the analysis of neutral ϱπ system from π + d interactions at 5.1 GeV/c is presented, and evidence for a new isoscalar resonance (ϱπ) is reported.
TL;DR: SOMMARIO as discussed by the authors, the second cranio di Mesoplodon pacificus Longman (1926) and stato raccolto nel 1955 sulla spiaggia di Danane in Somalia a 1° 52′ N and 45° 02′ E.
Abstract: SOMMARIO Un secondo cranio di Mesoplodon pacificus Longman (1926) e stato raccolto nel 1955 sulla spiaggia di Danane in Somalia a 1° 52′ N e 45° 02′ E. In seguito alla descrizione della nuova specie nel 1926 sorsero dubbi sulla sua validita, a causa anche del cattivo stato in cui versava l'esemplare. La scoperta di questo secondo cranio in ottimo stato di conservazione e venuta a confermare che Mesoplodon pacificus e specie valida. Nel presente lavoro alcune strutture caratteristiche, sfuggite alla descrizione originale del tipo, sono messe in evidenza e si e stabilito di considerare due di queste come caratteri distintivi della specie: si tratta dell'osso lacrimale avente una caratteristica forma a cappuccio, e di un lungo solco longitudinale lungo il margine esterno della lamina espansa dell'osso mascellare, sopra la cavita orbitale.
TL;DR: In this paper, the tautomerism of isoxazolin-5-ones was investigated by experimental determination of the dipole moments of several Isoxazoline-5.
TL;DR: The detection of histamine by bioassay was combined with observation of the mast cells by fluorescence microscopy, using a suitable staining technique for detecting histamine, which revealed the almost complete disappearance of fluorescent cytoplasmic granules, with no appreciable morphological changes.
TL;DR: In this article, the vibrational spectrum of (2,2') paracyclophane has been measured between 4000 and 50 cm −1, and the assignment of the ir active fundamentals was essentially based on the crystal spectra in polarized light of two different kinds of polycrystalline samples.
TL;DR: Acute hypoxia was produced in adult rats by cyanide inhalation and the effect on the active transport of amino acids was studied in brain slices and the results confirmed the importance of knowing the carrier and removal status of these amino acids in the transport process.
Abstract: —
(1) Acute hypoxia was produced in adult rats by cyanide inhalation and the effect on the active transport of amino acids was studied in brain slices.
(2) Initial and steady-state accumulation of amino acids and rates of amino acid exit were identical in brain slices from control and treated animals when a glucose-containing incubation medium was used.
(3) When the incubation was carried out in a glucose-free incubation medium, the inhibition of initial and steady-state accumulation and the stimulation of amino acid exit observed in control slices were significantly reduced or abolished in slices from treated animals.
(4) Tissue swelling, size of ‘inulin space’ and glucose consumption did not differ in the two groups of animals.
(5) Also the respiration rate was identical in slices from control and treated animals incubated in the presence of glucose. In the absence of added substrate, brain slices from treated animals consumed 15-20 per cent more oxygen than control slices.
(6) A possible correlation between the effects observed on amino acid transport and on respiration is suggested. The reasons why cyanide given in vivo or added in vitro have different effects on amino acid transport in brain slices are discussed.
TL;DR: In this article, the voltammetric behavior of Mn 3+, Mn 4+ and mixtures of these ionic species in 15 N H 2 SO 4 on a smooth platinum micro-electrode with periodical renewal of the diffusion layer was analyzed.
TL;DR: The mature larvae of Belonogaster are not able to push the peritrophic sac out completely by themselves, so the sac is extracted through an opening in the bottom of the cell, and taken away from the nest, by an adult wasp.
Abstract: SUMMARY The mature larvae of Belonogaster are not able to push the peritrophic sac out completely by themselves. The sac is extracted through an opening in the bottom of the cell, and taken away from the nest, by an adult wasp.
TL;DR: In this article, the authors show that the inner-sphere complex formation is responsible for the signal intensity decrease, while the outer-spheres complex contributes to the line broadening, leading to the same value of the equilibrium constants.
TL;DR: The arteria profunda femoralis, which is on an average 38,3 mms.
Abstract: According to observations carried out on 50 subjects (24 men and 26 women), the arteria profunda femoralis, which is on an average 38,3 mms. distant from the ligamentum inguinalis, considered as a fixed point of reference, gives rise in 73% of cases to the arteria circumflexa femoris medialis, with uniform distribution between the two sexes, and in 83% of cases to the arteria circumflexa femoris lateralis, with prevalence in the female sex, while in the remainder of the cases the two aa. circumflexae derive directly from the arteria femoralis. In relation to the different modes of origin of the aa. circumflexae femoris, the cases examined were subdivided into four groups: in the first group (5%) the two aa. circumflexae originate from the arteria femoralis; in the second group (22%) only the arteria circumflexa medialis arises from the arteria femoralis; in the third group (12%) it is the arteria circumflexa lateralis which originates from the arteria frofunda femoralis. While in the second group there is a prevalence of the female sex and in the 3rd group of the male, in the 4th group the two sexes are uniformly distributed. In as many as 29 cases a symmetrical arrangement of the arteries, on the two sides, was observed with prevalence in the female sex. Nach den an 50 Individuen (24 Mannern und 26 Frauen) durchgefuhrten Untersuchungen gehen von der Arteria profunda femoris, die vom Ligamentum inguinalis, das hier als fester Bezugspunkt angenommen wird, einen Abstand von durchschnittlich 38,3 mm hat, in 73% der Falle die Arteria circumflexa femoris medialis aus, bei gleicher Verteilung auf beide Geschlechter, und in 83% der Falle die Arteria circumflexa femoris lateralis, mit groserer Haufigkeit beim weiblichen Geschlecht; in den ubrigen Fallen dagegen haben die beiden Aa. circumflexae direkt bei der Arteria femoralis ihren Ursprung. Auf Grund des verschiedenen Ursprungs der beiden Aa. circumflexae femoris sind die untersuchten Falle in vier Gruppen eingeteilt worden: bei der ersten Gruppe (5%) gehen die beiden Aa. circumflexae von der Arteria femoralis aus, bei der zweiten Gruppe (22%) geht nur die Arteria circumflexa femoris medialis von der Arteria femoralis aus, bei der dritten Gruppe (12%) geht die Arteria circumflexa femoris lateralis von der Arteria femoralis aus und bei der vierten Gruppe (61%) haben beide Aa. circumflexae ihren Ursprung bei der Arteria profunda femoris. Wahrend bei der zweiten Gruppe das weibliche und bei der dritten Gruppe das mannliche Geschlecht bevorzugt ist, ist bei der vierten Gruppe die Haufigkeit bei beiden Geschlechtern gleich. In 29 von 50 Fallen konnte eine symmetrische Anordnung der betreffenden Arterien auf beiden Seiten festgestellt werden, wobei das weibliche Geschlecht bevorzugt war.
TL;DR: Two new taxa are described: Solpugassa dentatidens lanzai subsp.
Abstract: SUMMARY 69 specimens of Solifuga belonging to the families Ceromidae and Solpugidae from Ethiopia and Somalia have been studied. These include the Types of Zeriassa dubia Di Caporiacco 1944, Zeriassa rus polii (Pavesi) 1879, Solpugyla maestrii Di Caporiacco 1939 and the Cotypes of Zeriassa incerta Di Caporiacco 1941. Zeriassa incerta Di Caporiacco 1941 is found to be a synonym of Zeriassa ruspolii (Pavesi) 1879. Zeriassa longicornis Lawrence 1953 is probably a synonym of Zeriassa dubia Di Caporiacco 1944. The records of Zeriassa wabonica Roewer 1934, of Zeriassa inflexa Roewer 1934 from this area are found to be based on misidentified specimens. Two new taxa are described: Solpugassa dentatidens lanzai subsp. nov. and Zeriassa pardii sp. nov. Solpuga serraticornis Purcell 1899 is recorded for the first time in Ethiopia; for a number of other species new localities are recorded, in some instances thus providing considerable extensions to the known range of the species concerned.
TL;DR: In this article, a classification scheme for hadrons is proposed, which fits well with the experimental π-N resonances, under the hypothesis of SU (3) ⊗ SU(3) chiral algebra approximate saturation.