Shell growth of the golden mussel, Limnoperna fortunei (Dunker, 1857) (Mytilidae), in the Río de la Plata, Argentina

The golden mussel, Limnoperna fortunei, is an invasive freshwater bivalve. Since its introduction to Argentina, it had caused damage to the native fauna as well as economic damage to industries of the region. Here, we describe the growth of L. fortunei in a natural temperate environment in Argentina. Age was estimated according to the modal progression method. The constants in the von Bertalanffy growth model were adjusted by an iterative algorithm. Three annual cohorts had similar growth rates. The estimated t ₀ for each cohort showed a temporary displacement in relation to the spawning period.     

La grotte ornée Mayenne-Sciences (Thorigné-en-Charnie, Mayenne) : grotte-limite aux marges du monde anté-magdalénien

The decorated cave of Mayenne-Sciences (Thorigné-en-Charnie, Mayenne) is one of the eight caves or shelters attributed to the Upper Paleolithic in the North of France, with the caves of Gouy and Orival in Normandy, Boutigny, Le Croc-Marin and Les Trois Pignons in the Essonne Department, the Grotte du Cheval and the Grande Grotte of Arcy-sur-Cure in Burgundy. There are about 50 stylised representations in this cave, the chrono-cultural attribution is rather difficult because the archeological context is poor and the site of the cave excentric, far from the great areas like Perigord. After a short statement of what you may guess about the style of the representations in Mayenne-Sciences we try to draw up a synthesis of the sites of parietal art and furniture near Mayenne-Sciences, and to analyse further how to place Mayenne-Sciences within a figurative tendance flourishing during the ante-magdalenian era in Europe which we propose to call art de la silhouette. We show that the style of Mayenne-Sciences is not 50 particular, but that the originality of the style may be explained by the isolation of the cave at the border of the main prehistorical cultural tendances, as this is the case for other decorated caves, we list up. In conclusion this leads us to define the concept of grotte-limite (border-cave), I mean a decorated cave which represents the vision at distance, with caricatural character or not, of the parietal art of one specific region, as for example you must admit that there are similitude’s between Mayenne-Sciences and the caves of Pech-Merle and Cougnac, in the Lot Department.     

中国车前属两种植物的补记

首次报道了毛瓣车前Plantago lagocephala Bunge在中国的分布,确认了一个鲜为人知的中国特有种——苣叶车前P．perssonii Pilger,并提供了二者的详细描述。     

Actualización en el manejo de la degeneración macular asociada a la edad

Age-related macular degeneration is the leading cause of legal blindness in people over 50 in developed countries. It is a multifactorial disease resulting from the interaction of genetic and environmental factors, and the age is the only worldwide admitted risk factor. The socioeconomic impact of the disease reaches enormous proportions, if we take into account the high cost of the available antiangiogenic therapy, the strict schedule of medical visits that it requires, and the impairment that it gives rise to. The response to treatment and the visual outcomes improve with early management of the retinal lesions, thus the early diagnosis of the disease in its initial phases, based on self-control with an Amsler grid and with regular ophthalmologic assessments, is essential.     

Absolute nannofossil abundance estimates: Quantifying the pros and cons of different techniques

A quick and inexpensive method to determine absolute nannofossil abundance in deep sea sediments – the “drop” technique (modified dilution method) – was compared to two other available methods – the filtration and random settling techniques. All techniques rely on the same basic principle, under which a volume of known concentration (bulk sediment weight/mL) is distributed evenly over a known total area (glass slide or filter) to then count particles within a set of (randomly) selected fields of view. The three preparation techniques were also calibrated by spiking the samples with microbeads to approach the “real values” as closely as possible. Significant offsets in abundance estimates between methods mainly reflect bias due to the uneven distribution and/or loss of particles. We show that the drop technique is most consistent and accurate in estimating “real values” and offers similar or better reproducibility than the other techniques. The drop method also allows detection of the same trends with or without calibration with microbeads. The filtration method holds the risk to drastically underestimate absolute abundances, while the settling technique is demanding in terms of time and may suffer from advection processes. The composition of nannofossil assemblages can be reliably determined by any of the three different techniques.     

Cardiac MIBG imaging at the edge of clinical application in heart failure

Neuronal innervation plays a crucial role in cardiac function. The heart is richly innervated with sympathetic and parasympathetic fibers that work in conjunction with circulating catecholamine mediators, such as norepinephrine (NE), to tightly regulate cardiac output at rest and during periods of increased cardiac demand. An impairment of cardiac autonomic function, most often the result of cardiac disease (ischemic or nonischemic cardiomyopathy), can reflect the severity of the condition, and in many cases is associated with and likely contributing to worsening of the clinical condition, increasing the potential for life-threatening cardiac arrhythmias and death. Because cardiac autonomic function involves numerous molecular processes, use of radiotracers for imaging is an ideal method of assessment.     

Velocidad de marcha y desarrollo de trastornos neurocognitivos en adultos mayores: resultados de una cohorte peruana

Introduction

The prevention and management of neurocognitive disorders (NCD) among older adults can be improved by early identification of risk factors such as walking speed. The objective of the study is to assess the association between gait speed and NCD onset in a population of Peruvian older adults.