Clusters of cyclones encircling Jupiter's poles.

The familiar axisymmetric zones and belts that characterize Jupiter's weather system at lower latitudes give way to pervasive cyclonic activity at higher latitudes. Two-dimensional turbulence in combination with the Coriolis ß-effect (that is, the large meridionally varying Coriolis force on the giant planets of the Solar System) produces alternating zonal flows. The zonal flows weaken with rising latitude so that a transition between equatorial jets and polar turbulence on Jupiter can occur. Simulations with shallow-water models of giant planets support this transition by producing both alternating flows near the equator and circumpolar cyclones near the poles. Jovian polar regions are not visible from Earth owing to Jupiter's low axial tilt, and were poorly characterized by previous missions because the trajectories of these missions did not venture far from Jupiter's equatorial plane. Here we report that visible and infrared images obtained from above each pole by the Juno spacecraft during its first five orbits reveal persistent polygonal patterns of large cyclones. In the north, eight circumpolar cyclones are observed about a single polar cyclone; in the south, one polar cyclone is encircled by five circumpolar cyclones. Cyclonic circulation is established via time-lapse imagery obtained over intervals ranging from 20 minutes to 4 hours. Although migration of cyclones towards the pole might be expected as a consequence of the Coriolis ß-effect, by which cyclonic vortices naturally drift towards the rotational pole, the configuration of the cyclones is without precedent on other planets (including Saturn's polar hexagonal features). The manner in which the cyclones persist without merging and the process by which they evolve to their current configuration are unknown.

The hypothalamic paraventricular nucleus as a central hub for the estrogenic modulation of neuroendocrine function and behavior.

Estradiol and hypothalamic paraventricular nucleus (PVN) help coordinate reproduction with body physiology, growth and metabolism. PVN integrates hormonal and neural signals originating in the periphery, generating an output mediated both by its long-distance neuronal projections, and by a variety of neurohormones produced by its magnocellular and parvocellular neurosecretory cells. Here we review the cyto-and chemo-architecture, the connectivity and function of PVN and the sex-specific regulation exerted by estradiol on PVN neurons and on the expression of neurotransmitters, neuromodulators, neuropeptides and neurohormones in PVN. Classical and non-classical estrogen receptors (ERs) are expressed in neuronal afferents to PVN and in specific PVN interneurons, projecting neurons, neurosecretory neurons and glial cells that are involved in the input-output integration and coordination of neurohormonal signals. Indeed, PVN ERs are known to modulate body homeostatic processes such as autonomic functions, stress response, reproduction, and metabolic control. Finally, the functional implications of the estrogenic modulation of the PVN for body homeostasis are discussed.

South-polar features on Venus similar to those near the north pole.

Venus has no seasons, slow rotation and a very massive atmosphere, which is mainly carbon dioxide with clouds primarily of sulphuric acid droplets. Infrared observations by previous missions to Venus revealed a bright 'dipole' feature surrounded by a cold 'collar' at its north pole. The polar dipole is a 'double-eye' feature at the centre of a vast vortex that rotates around the pole, and is possibly associated with rapid downwelling. The polar cold collar is a wide, shallow river of cold air that circulates around the polar vortex. One outstanding question has been whether the global circulation was symmetric, such that a dipole feature existed at the south pole. Here we report observations of Venus' south-polar region, where we have seen clouds with morphology much like those around the north pole, but rotating somewhat faster than the northern dipole. The vortex may extend down to the lower cloud layers that lie at about 50 km height and perhaps deeper. The spectroscopic properties of the clouds around the south pole are compatible with a sulphuric acid composition.

Diagnosis and treatment of hypertensive emergencies and urgencies among Italian emergency and intensive care departments. Results from an Italian survey: Progetto GEAR (Gestione dell'Emergenza e urgenza in ARea critica).

Hypertensive emergencies (HE) and urgencies (HU) are frequent causes of patients referral to Emergency Department (ED) and the approach may be different according to local clinical practice. Our aim was to explore awareness, management, treatment and counselling after discharge of HE and HU in Italy, by mean of an on-line survey. The young investigator research group of the Italian Society of Hypertension developed a 23-item questionnaire spread by e-mail invitation to the members of Italian Scientific societies in the field of Hypertension. 665 questionnaires were collected from EDs, Emergency and Urgency Medicine, Cardiology or Coronary Units, Internal Medicines, Intensive care, Stroke units. Symptoms considered suspicious of acute organ damage were: chest pain (89.0%), visual disturbances (89.8%), dyspnoea (82.7%), headache (82.1%), dizziness (52.0%), conjunctival haemorrhages (41.5%), tinnitus (38.2%) and epistaxis (34.4%). Exams more frequent prescribed were: electrocardiogram (97.2%), serum creatinine (91.4%), markers of cardiomyocyte necrosis (66.2%), echocardiography (65.1%). The use of intravenous or oral medications to treat HEs was 94.7% and 3.5%, while for HUs 24.4% and 70.8% respectively. Of note, a surprisingly high percentage of physicians (22 % overall, 24.5% in North Italy) used to prescribe sublingual nifedipine. After discharge, home blood pressure monitoring and general practitioner re-evaluation were more frequently suggested, while ambulatory blood pressure monitoring and hypertension specialist examination were less prescribed. The differences observed across the different macro-areas, regarded prescription of diagnostic test and drug administration. This survey depicts a complex situation of shades and lights in the real-life management of HE and HU in Italy.

Association Between the Serum Uric Acid Levels and Lacunar Infarcts in the Elderly.

Increasing evidence suggests that uric acid (UA) is a relevant risk factor for arteriolosclerosis and recent studies have demonstrated the positive relationship between UA concentrations and the severity of leukoaraiosis. However, the association between lacunar infarcts (LI) and UA levels has seldom been reported in the literature. The aim of our study was to assess whether serum UA levels may be related to the presence of LI. We recruited 242 patients (113 males and 129 females, aged 82.83 ± 6.49 years) from our Geriatric Department for whom CAT scans (CT) were available. Clinical and laboratory data was collected. Patients CT images were examined to identify the presence, the size, the number, and the location of LI. LI without neurological symptoms were considered silent LI. Serum UA levels were found to be positively associated with the presence (p = 0.0001), the number (p = 0.001), the size (p = 0.001), and the location of LI in the basal ganglia (p = 0.0038), the deep white matter (DWM) (p < 0.0001), and the pons (p = 0.0156). A significant association was also found between UA and silent LI (p = 0.0002). The prevalence of LI increased starting from UA levels of 5.7 mg/dl. Stepwise multiple regression analysis confirmed that UA was independently related with the presence, the number, the size, LI in the basal ganglia, the DWM, the pons, and with silent LI. Our study suggests a positive association between UA levels and LI, which is independent of traditional cardiovascular risk factors. This data suggests that UA plays an influential role on the physiopathology of LI and could represent a potential target to prevent cerebral microinfarcts.

Juno observations of spot structures and a split tail in Io-induced aurorae on Jupiter.

Jupiter's aurorae are produced in its upper atmosphere when incoming high-energy electrons precipitate along the planet's magnetic field lines. A northern and a southern main auroral oval are visible, surrounded by small emission features associated with the Galilean moons. We present infrared observations, obtained with the Juno spacecraft, showing that in the case of Io, this emission exhibits a swirling pattern that is similar in appearance to a von Kármán vortex street. Well downstream of the main auroral spots, the extended tail is split in two. Both of Ganymede's footprints also appear as a pair of emission features, which may provide a remote measure of Ganymede's magnetosphere. These features suggest that the magnetohydrodynamic interaction between Jupiter and its moon is more complex than previously anticipated.

Jupiter's interior and deep atmosphere: The initial pole-to-pole passes with the Juno spacecraft.

On 27 August 2016, the Juno spacecraft acquired science observations of Jupiter, passing less than 5000 kilometers above the equatorial cloud tops. Images of Jupiter's poles show a chaotic scene, unlike Saturn's poles. Microwave sounding reveals weather features at pressures deeper than 100 bars, dominated by an ammonia-rich, narrow low-latitude plume resembling a deeper, wider version of Earth's Hadley cell. Near-infrared mapping reveals the relative humidity within prominent downwelling regions. Juno's measured gravity field differs substantially from the last available estimate and is one order of magnitude more precise. This has implications for the distribution of heavy elements in the interior, including the existence and mass of Jupiter's core. The observed magnetic field exhibits smaller spatial variations than expected, indicative of a rich harmonic content.

Alterations in rat carbohydrate metabolism induced by canatoxin as a probable consequence of primary hypoxia.

1. Canatoxin, a protein displaying lipoxygenase-activating properties isolated from Canavalia ensiformis seeds, induces hypoxia and hyperglycemia in male rats. 2. Liver glycogen, blood glucose and lactate levels were measured in male and female rats after canatoxin (50 mU, iv) injection. Increased levels of serum glutamic oxaloacetic transaminase activity were used as an indicator of hepatic injury. 3. There was no sex-related difference observable during canatoxin-induced hypoxia but male and female rats did show different patterns of metabolic change and hepatic injury after toxin administration. Increased blood glucose and lactate levels, liver glycogenolysis and hepatic injury were observed in male rats while female rats showed only hypoglycemia and glycogenolysis. 4. Pretreatment of male rats with either glucose, diazepam or hexamethonium abolished both the hypoxia and hepatic injury and the metabolic alterations produced by toxin injection. 5. The results suggest that the metabolic alterations and hepatic injury detected after canatoxin injection may be a consequence of primary hypoxia.

[Encephalopathy in an adult with Shigella]. / Encefalopatía en un adulto con shigellosis.

A case of sporadic shigellosis is reported. A 30 year old woman, presented neurologic dysfunction, mild watery diarrhea and fever which had started one week before her admission. Abdominal tenderness, confusion, delirium, impairment of orientation and of recent memory were found. Abnormal motor activity with rigidity, tremors, myoclonus around the mouth also existed. There were neither focal signs nor signs of meningeal irritation. Computed tomography and nuclear magnetic resonance of the brain were normal. Laboratory analyses did not explain the anomalies. Several deep ulcers were disclosed by colonoscopy and a S. flexneri was isolated from the material extracted by endoscopy. Nonspecific colitis was informed by pathology. The patient was treated with 400 mg ciprofloxacin for 14 days, with improvement of the clinical picture. The most prominent aspect in this case was the clinical presentation with predominant neurologic symptoms creating the impression of a primary nervous system disease. Admission diagnosis was viral encephalitis. We believe that all of the anomalies present in our patient, the diarrhea and encephalopathy, were produced by the same etiologic agent, S. flexneri and by its toxins.

[Carpal tunnel syndrome as initial manifestation of polymyalgia rheumatica]. / Síndrome del túnel carpiano como manifestación inicial de polimalgia reumática.

A case of polymyalgia rheumatica with atypical manifestations, including carpal tunnel syndrome, distal myalgias and a low eritro sedimentation is reported. The association of polymyalgia rheumatica and carpal tunnel syndrome is controversial. Although it has been reported previously in a recent and large review of carpal tunnel syndrome in Rochester, USA, there was not any more cases of polymyalgia rheumatica associated with carpal tunnel syndrome than in the general population. In our patient, the symptoms of polymyalgia rheumatica and of carpal tunnel syndrome were present at the beginning, and both responded satisfactorally to the treatment with methylprednisone. This form of presentation and its response to treatment suggest that the symptoms of carpal tunnel syndrome are caused by the inflammation of the carpal synovial, which is an unfrequent manifestation of polymyalgia rheumatica. We report this case for the purpose of altering to an unusual form of presentation of polymyalgia rheumatica in order to avoid unnecessary surgery for the carpal tunnel syndrome.

[Thrombotic thrombocytopenic purpura and systemic lupus erythematous. Three cases presenting simultaneously]. / Púrpura trombocitopenica trombótica y lupus eritematoso sistémico. Tres casos con presentación simultánea.

Thrombotic thrombocytopenic purpura (TTP) is a clinical syndrome characterized by microangiopathic hemolytic anemia, thrombocytopenia, fever, neurological symptoms, and renal involvement. The relationship of TTP to systemic lupus erythematosus (SLE) has been recognized in the medical literature since 1939. The differential diagnosis is difficult because both diseases have similar clinical features. The mainstay for recognizing TTP in the context of active SLE is the presence of helmet red cells, marked reticulocytosis, and negative direct Coomb's test. We report three female patients with simultaneous presentation of TTP and SLE. We suggest combined treatment with immunosuppressive therapy and plasma exchange using fresh frozen plasma.

Chronic unpredictable stress and long-term ovariectomy affect arginine-vasopressin expression in the paraventricular nucleus of adult female mice.

Arginine-Vasopressin (AVP) may regulate the hypothalamic-pituitary-adrenal axis (HPA) and its effects on depressive responses. In a recent study, we demonstrated that Chronic Unpredictable Stress (CUS) depressive effects are enhanced by long-term ovariectomy (a model of post-menopause). In the present study, we investigated the effects of long-term ovariectomy and CUS on AVP expression in different subdivision of the paraventricular nucleus (PVN) of female mice. Both long-term ovariectomy and CUS affect AVP immunoreactivity in some of the PVN subnuclei of adult female mice. In particular, significant changes on AVP immunoreactivity were observed in magnocellular subdivisions, the paraventricular lateral magnocellular (PaLM) and the paraventricular medial magnocellular (PaMM), the 2 subnuclei projecting to the neurohypophysis for the hormonal regulation of body homeostasis. AVP immunoreactivity was decreased in the PaLM by both the long-term deprivation of ovarian hormones and the CUS. In contrast, AVP immunoreactivity was increased in the PaMM by CUS, whereas it was decreased by ovariectomy. Therefore, present results suggest morphological and functional differences among the PVN's subnuclei and complex interactions among CUS, gonadal hormones and AVP immunoreactivity.

Photo-ionization of aluminum in a hot cavity for the selective production of exotic species project.

SPES (Selective Production of Exotic Species) is an Isotope Separation On-Line (ISOL) based accelerator facility that will be built in the Legnaro-Istituto Nazionale di Fisica Nucleare (INFN) Laboratory (Italy), intended to provide intense neutron-rich radioactive ion beams obtained by proton-induced fission of a uranium carbide (UCx) target. Besides this main target material, silicon carbide (SiC) will be the first to be used to deliver p-rich beams. This target will also validate the functionality of the SPES facility with aluminum beam as result of impinging SiC target with proton beam. In the past, off line studies on laser photoionization of aluminum have been performed in Pavia Spectroscopy Laboratory and in Laboratori Nazionali di Legnaro; a XeCl excimer laser was installed in order to test the laser ionization in the SPES hot cavity. With the new Wien filter installed a better characterization of the ionization process in terms of efficiency was performed and results are discussed.

Role of oestrogen receptors on the modulation of NADPH-diaphorase-positive cell number in supraoptic and paraventricular nuclei of ovariectomised female rats.

Modulation of the nitric oxide producing system (demonstrated via the NADPH-diaphorase histochemical reaction) by oestradiol has been established in several structures of the rat brain. The present study aimed to explore the possible regulation of NADPH-diaphorase activity by oestradiol in neurones of the supraoptic (SON) and paraventricular (PVN) nuclei and the role of oestrogen receptors (ERα and ERß) in this regulation. Adult ovariectomised rats were divided into six groups and injected either with vehicle or a single dose of oestradiol, a selective ERα agonist-PPT [4,4',4″-(4-propyl-[1H]-pyrazole-1,3,5-triyl)trisphenol], a selective ERß agonist-DPN [2,3-bis(4-hydroxyphenyl)-propionitrile], a selective ERα antagonist-MPP [1,3-bis(4-hydroxyphenyl)-4-methyl-5-[4-(2-piperidinylethoxy)phenol]-1H-pyrazole dihydrochloride] or a selective ERß antagonist-PHTPP (4-[2-phenyl-5,7-bis(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-3-yl]phenol). The number of NADPH-diaphorase positive elements in the SON and the PVN was modulated by both ERs but, depending on the nucleus, ERα and ERß ligands induced different effects. These results suggest that the regulation of nitrergic system by ERs may play a role in the control of oestrogen-dependent physiological mechanisms regulated by the SON and the PVN.

Estrogenic regulation of NADPH-diaphorase in the supraoptic and paraventricular nuclei under acute osmotic stress.

Estrogen receptors (ERs) α and ß are involved in the regulation of the nitrergic system in the supraoptic (SON) and paraventricular (PVN) nuclei under basal conditions. In this study we have assessed whether ERs are also involved in the modulation of the nitrergic system in the SON and PVN under acute systemic hypertonic conditions. Adult ovariectomized rats received a single injection of either estradiol, a selective ERα agonist, a selective ERß agonist, a selective ERα antagonist, a selective ERß antagonist or vehicle. Twenty-four hours later, animals received one i.p. injection of 1.5M NaCl to induce osmotic stress and were sacrificed after two additional hours. The number of NADPH-diaphorase-positive cells in the SON and PVN was determined. Their number in the SON was not affected by NaCl administration, whereas in the four PVN subdivisions it was decreased after NaCl administration. Estradiol and the ERα agonist prevented the action of NaCl in the four subdivisions of the PVN. In contrast, the inhibition of ERα enhanced the effect of NaCl, inducing a further decrease in the number of NADPH-diaphorase-positive cells. Moreover, the ERß agonist enhanced and the ERß antagonist blocked the effect of NaCl on the number of NADPH-diaphorase-positive neurons in the SON and in the medial magnocellular subdivision of the PVN. These findings indicate that estradiol regulates the nitrergic system in the SON and PVN under acute osmotic stress conditions, but the effects specifically depend on the anatomical subregions and different ERs.

Studies for aluminum photoionization in hot cavity for the selective production of exotic species project.

Selective production of exotic species (SPES) is an ISOL-based accelerator facility that will be built in the Legnaro INFN Laboratory (Italy), intended to provide an intense neutron-rich radioactive ion beams obtained by proton induced fission of an uranium carbide target. Beside this main target, a silicon carbide (SiC) target will the first to be used to deliver some p-rich beams. This target will validate also the functionality of the SPES facility with aluminum beam as result of hitting SiC target with protons. In the past off-line studies on laser photoionization of aluminum have performed in Pavia Spectroscopy Laboratory and in Laboratori Nazionali di Legnaro where, recently, a XeCl excimer laser was installed in order to test the laser ionization in the SPES hot cavity. Results are promising to justify further studies with this technique, aiming a better characterization of the SPES ion extraction capability under laser photoionization.

The surface composition and temperature of asteroid 21 Lutetia as observed by Rosetta/VIRTIS.

The Visible, InfraRed, and Thermal Imaging Spectrometer (VIRTIS) on Rosetta obtained hyperspectral images, spectral reflectance maps, and temperature maps of the asteroid 21 Lutetia. No absorption features, of either silicates or hydrated minerals, have been detected across the observed area in the spectral range from 0.4 to 3.5 micrometers. The surface temperature reaches a maximum value of 245 kelvin and correlates well with topographic features. The thermal inertia is in the range from 20 to 30 joules meter(-2) kelvin(-1) second(-0.5), comparable to a lunarlike powdery regolith. Spectral signatures of surface alteration, resulting from space weathering, seem to be missing. Lutetia is likely a remnant of the primordial planetesimal population, unaltered by differentiation processes and composed of chondritic materials of enstatitic or carbonaceous origin, dominated by iron-poor minerals that have not suffered aqueous alteration.