Andean Maca (Lepidium meyenii) is a herbaceous biennial or annual plant native of the high central Andes of Peru that grows exclusively at altitudes ranging from 4,000 to 4,500 m above sea level. Three different types of maca can be found depending on the colour of its dry root (red, yellow or black), each of which has been attributed several medicinal properties (Gonzales, Villaorduña, Gasco, Rubio, & Gonzales, 2014). The composition of maca comprises nearly 55%-60% carbohydrates, 10%-12% proteins, 8%-9% fibres and 2%-3% lipids, as well as significant amounts of essential amino acids, fatty acids, iron, calcium and zinc (Piacente, Carbone, Plaza, Zampelli, & Pizza, 2002). The benefits of maca have been demonstrated in several conditions such as prostatic benign hyperplasia, osteoporosis in adults' rats and reduce glycaemia in diabetes mellitus (Gonzales-Arimborgo et al., 2016); however, from as far back as the XVI century and still today, the most renowned property of maca in Andean tradition is its beneficial effect on libido and fertility in both sexes (Balick & Lee, 2002). The effects of maca on fertility were initially demonstrated in animals (Gonzales,

We report on the development of inkjet-printed thin-film resistors using both organic and inorganic ink formulations. The passive devices were manufactured on flexible polymer substrates in ambient condition without the need for a cleanroom environment or inert atmosphere and at a maximum temperature of 150 °C. By using the same manufacturing process, the rapid electrical sintering (RES) method is demonstrated as effective for the fabrication of inkjet-printed, programmable Write-Once-Read-Many (WORM) memories. Several hundred fully inkjet-printed resistors with different parameters were fabricated and subsequently morphologically and electrically characterized with the aim of obtaining statistically significant data. From a manufacturing process viewpoint, the procedures based on inkjet printing herein described are highly attractive: they do not require high temperatures, low pressures, special atmospheric conditions, and any masks, therefore providing a versatile low-cost approach to fabricate passive electrical components and simple circuits useful for the electronic industry. Printing can be carried out at a sufficiently low temperature to avoid damage to the fabric substrate and these devices can be used in a range of applications requiring flexible and conformal devices from embedded passive filters in PCBs to wearable electronics.

Compounds 2 (M = Mg) obtained in the mono addition of vinylmagnesium bromide to squarates are attractive structural models to determine the influence of complexation between magnesium(II) and the alkoxide group on the regioselectivity of the 1,2- versus 1,4-addition of organomagnesium by complex induced proximity effects (CIPE). The 1,4-addition is observed almost exclusively in the case of vinylmagnesium in THF solution with formation of hydroxyketones type 5, which are always side or minor products in the known reaction of alkenyllithium derivatives. A comparative study on the reactivity of alkenyllithium and magnesiun derivatives is reported. The high regioselectivitity observed in the 1,4-addition of vinylmagnesium bromide is fully understood by computational studies of compounds 2 (M = Mg) at the DFT level with the density functional B3LYP.

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