EFFECT OF SOLAR DRYING ON THE COMPOSITION OF ESSENTIAL OIL OF SACHA CULANTRO (ERYNGIUM FOETIDUM L.) GROWN IN THE PERUVIAN AMAZON

Two solar drying methods (direct cabinet solar dryer and indirect cabinet solar dryer) were tested under tropical conditions for drying aerial parts of sacha culantro ( Eryngium foetidum L.) in Pucallpa City (Peruvian Amazon). The drying behavior was monitored during all experimental runs. Dried samples and fresh leaves were hydrodistilled and isolated oils were analyzed using gas chromatography with flame ionization detector and gas chromatography-mass spectrometry. ( E )-2-dodecenal was determined as the main constituent of the sacha culantro essential oil, averaging 61.8–62.2%, followed by n -dodecanal (10.9–15.5%), ( E )-2-tetradecenal (6.7–7.6%) and 1-tetradecene (3.6–5.7%). When comparing both solar drying methods, the indirect method was found as more suitable for drying E. foetidum since the dried product resembled the fresh herb more closely in its chemicalcomposition and had better appearance. However, a better drying efficiency of 10.3% was achieved when drying in the direct solar dryer compared with 5.8% for the indirect solar dryer.

PRACTICAL APPLICATIONS

Harvested leaves of sacha culantro are widely used as a condiment in a range of Peruvian, Latin American and Caribbean foods, including vegetable and meat dishes, canned food and sauces. There is lack of any postharvest processing of this herb although it may extend possibilities for use of the herb and facilitate the product export from local production areas and might be a good economic source for poor local farmers. This study shows solar drying as a reasonable preservation technique of sacha culantro leaves which may have a practical application in case of postharvest processing of the herb in the target region of Pucallpa City in Peruvian Amazon.     

Knockdown of apoptosis-inducing factor disrupts function of respiratory complex

Recent findings suggest that apoptotic protein apoptosis-inducing factor (AIF) may also play an important non-apoptotic function inside mitochondria. AIF was proposed to be an important component of respiratory chain complex I that is the major producer of superoxide radical. The possible role of AIF is still controversial. Superoxide production could be used as a valuable measure of complex I function, because the majority of superoxide is produced there. Therefore, we employed superoxide-specific mitochondrial fluorescence dye for detection of superoxide production. We studied an impact of AIF knockdown on function of mitochondrial complex I by analyzing superoxide production in selected cell lines. Our results show that tumoral telomerase-positive (TP) AIF knockdown cell lines display significant increase in superoxide production in comparison to control cells, while a non-tumoral cell line and tumoral telomerase-negative cell lines with alternative lengthening of telomeres (ALT) show a decrease in superoxide production. According to these results, we can conclude that AIF knockdown disrupts function of complex I and therefore increases the superoxide production in mitochondria. The distinct effect of AIF depletion in various cell lines could result from recently discovered activity of telomerase in mitochondria of TP cancer cells, but this hypothesis needs further investigation     

HOMEOWNERSHIP AND NEIGHBORHOOD SATISFACTION AMONG LOW‐ AND MODERATE‐INCOME HOUSEHOLDS

ABSTRACT: Most research on homeownership is conducted on nationally representative samples of homeowners and fails to isolate the unique experience of low‐ and moderate‐income (LMI) homeowners. Given the interest of policymakers in promoting homeownership among LMI households over the past 20 years, along with the apparent role played by risky borrowers—many of whom are low‐income—in the current housing market crisis, it is important to evaluate both economic and social outcomes for this subgroup of homeowners. Using a matched set of LMI owners and renters in the 2007 Community Advantage Program (CAP) panel, we assess the effect of homeownership on neighborhood satisfaction. By including various individual and neighborhood characteristics as covariates, we employ multilevel modeling and propensity score matching to address the nested structure of the data and endogeneity issues. Findings indicate that homeownership is an important predictor of neighborhood satisfaction among LMI households, even when controlling for a host of socioeconomic, demographic, and neighborhood characteristics. This may suggest that homeownership can serve as a viable way to improve neighborhood satisfaction among LMI households. This is important as neighborhood satisfaction is highly associated with overall quality of life.     

ELASTO-PLASTIC INTERFACE MODEL FOR 3D-FRICTIONAL ORTHOTROPIC CONTACT PROBLEMS

The present study deals with the solution of the fully three-dimensional contact/friction problem taking into account microstructural characteristics of the surfaces. An incremental non-associated hardening friction law model analogous to the classical theory of plasticity is used. Two different non-linear friction functions in the orthogonal directions are used to account for the orthotropic properties of the contacting bodies. A frontal solver processing unsymmetric matrices is adopted. Two numerical examples have been selected to show applicability of the method proposed. © 1997 by John Wiley & Sons, Ltd.     

GENTRIFICATION,SOCIOECONOMIC CHANGE,AND THE GEOGRAPHY OF DISPLACEMENT

ABSTRACT: This paper examines the effect of continuing gentrification on household displacement in London. The author analyzes the geography and selectivity of migration. She found that long-range displacement from gentrifying areas affects progressively higher status households. Migrations over short distances are characteristic of low status households. This bifurcation is exploreed in relation to the integration of structure-based and agency-based approaches to the explanation of gentrification.     

Cyanogenesis in Canned Stone Fruits

The amount of cyanogenic glycosides in seeds and pulp of stone fruits, and the HCN content in heat processed unstoned fruit have shown that the decisive factors affecting HCN concentration in canned unstoned fruits are the glycoside content of raw fruits and the conditions of heat processing. Enzymatic hydrolysis of glycosides during canning is the main source of HCN in fruit products. HCN contents found in canned fruits (0-4 mg-kg^?1) were not acutely toxic, but are not negligible.     

Spatial Segregation in Seven Cities: A Longitudinal Study of Home Ownership, 1971-91

Globalisation has been associated with the development of 'command node' cities in the global economy (Friedman, 1986; Sassen, 1991). Some scholars have argued that the social and spatial structure of such cities has been polarised, because of changing demand for labour and land. A number of debates have developed around this hypothesis, challenging the general applicability of these socio-economic trends to all global cities (e.g. Bruegel, 1996; Hamnett, 1996), while the spatial changes in the housing markets of global cities have been shown to be varied (Marcuse & van Kempen, 2000). They are heavily dependent on local context, but always associated with increased segregation of rich and poor, whether through displacement of the poor from the urban core (Smith, 1989) or through their displacement within it (Lyons, 1996). The present paper suggests that much can be learnt about urban change in an era of globalisation, from analysis of the differences between global and other cities. The hypothesis is that spatial restructuring of housing markets in London, a global city, is likely to have important similarities with those of other cities in England, which occupy lower positions in a global urban hierarchy. A comparison of the extent of socio-spatial clustering of home ownership in London, with six English cities at various levels of the urban hierarchy is presented, which partly supports the hypothesis, comparing change over a 20-year period, based on cross-sectional and longitudinal analyses of ONS Longitudinal Study data for the years 1971, 1981 and 1991. Findings were that, despite its more socially polarised labour market, London's home ownership market was less spatially segregated than that of other cities in the sample. Implications for global city theory, and for the interpretation of the dynamics of other urban markets, are discussed.     

Information content analysis in automated microscopy imaging using an adaptive autofocus algorithm for multimodal functions

We present a new algorithm to analyse information content in images acquired using automated fluorescence microscopy. The algorithm belongs to the group of autofocusing methods, but differs from its predecessors in that it can handle thick specimens and operate also in confocal mode. It measures the information content in images using a ‘content function’, which is essentially the same concept as a focus function. Unlike previously presented algorithms, this algorithm tries to find all significant axial positions in cases where the content function applied to real data is not unimodal, which is often the case. This requirement precludes using algorithms that rely on unimodality. Moreover, choosing a content function requires careful consideration, because some functions suppress local maxima. First, we test 19 content functions and evaluate their ability to show local maxima clearly. The results show that only six content functions succeed. To save time, the acquisition procedure needs to vary the step size adaptively, because a wide range of possible axial positions has to be passed so as not to miss a local maximum. The algorithm therefore has to assess the steepness of the content function online so that it can decide to use a bigger or smaller step size to acquire the next image. Therefore, the algorithm needs to know about typical behaviour of content functions. We show that for normalized variance, one of the most promising content functions, this knowledge can be obtained after normalizing with respect to the theoretical maximum of this function, and using hierarchical clustering. The resulting algorithm is more reliable and efficient than a simple procedure with constant steps.