Influence of time on social preferences: Implications for life-span development.

Socioemotional selectivity theory holds that the reliable decline in social contact in later life is due, in part, to older people's preferences for emotionally meaningful social partners and that such preferences are due not to age, per se, but to perceived limitations on time. Confirming the theory, in both the United States and Hong Kong, older people showed a preference for familiar social partners, whereas younger people did not show this preference. However, when asked to imagine an expansive future, older people's bias for familiar social partners disappeared. Conversely, in the face of a hypothesized constraint on time, both younger and older people preferred familiar social partners. Moreover, social preferences in Hong Kong differed before and after the 1997 handover of Hong Kong to the People's Republic of China, which was construed as a sociopolitical time constraint. One year prior to the handover, only older people displayed preferences for familiar partners. Two months before the handover, both age groups showed such preferences. One year after the handover, once again, only older Hong Kong people preferred familiar social partners. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effect of drinking milk containing conjugated linoleic acid on fecal microbiological profile,enzymatic activity,and fecal characteristics in humans

Background  

The primary objective was to determine whether consumption of conjugated linoleic acids (CLAs) affected the fecal microbiota composition, fecal enzyme activity or fecal composition.     

Digestion,milk production,milk composition,and blood composition of dairy cows fed whole flaxseed

A total of 90 lactating Holstein cows averaging 628 kg (SE = 8) of body weight (BW) were allotted at calving to 30 groups of three cows blocked for similar calving dates to determine the effects of feeding whole untreated flaxseed on milk production and composition, fatty acid composition of blood and milk, and digestibility, and to determine whether flaxseed could substitute for other sources of fat such as Megalac and micronized soybeans. Cows were fed a total mixed diet based on grass and corn silage and fat supplements for ad libitum intake. The experiment was carried out from calving up to wk 16 of lactation. Cows within each block were assigned to one of the three isonitrogenous, isoenergetic, and isolipidic supplements based on either whole flaxseed (FLA), Megalac (MEG), or micronized soybeans (SOY). Intake of dry matter and change in BW were similar among diets. Cows fed FLA had greater milk yield than those fed MEG (35.7 vs. 33.5 kg/d) and there was no difference between cows fed FLA and those fed SOY (34.4 kg/d). Fat percentage was higher in the milk of cows fed MEG (4.14%) than in the milk of those fed FLA (3.81%) or SOY (3.70%), but milk protein percentage was higher for cows fed FLA (2.98%) than for those fed MEG (2.86%) and SOY (2.87%). Digestibilities of acid detergent fiber, neutral detergent fiber, and ether extract were lower for cows fed FLA than for those fed SOY and MEG. Retention of N was similar among diets. Feeding FLA resulted in the lowest omega-6-to-omega-3-fatty-acids ratio, which would improve the nutritive value of milk from a human health point of view. The data suggest that micronized soybeans and Megalac can be completely substituted by whole untreated flaxseed as the fat source in the diet of early lactating cows without any adverse effect on production and that flaxseed increased milk protein percentage and its omega-6-to-omega-3-fatty-acids ratio.     

Classification of particle effective shape ratios in cirrus clouds based on the lidar depolarization ratio

A shape classification technique for cirrus clouds that could be applied to future spaceborne lidars is presented. A ray-tracing code has been developed to simulate backscattered and depolarized lidar signals from cirrus clouds made of hexagonal-based crystals with various compositions and optical depth, taking into account multiple scattering. This code was used first to study the sensitivity of the linear depolarization rate to cloud optical and microphysical properties, then to classify particle shapes in cirrus clouds based on depolarization ratio measurements. As an example this technique has been applied to lidar measurements from 15 mid-latitude cirrus cloud cases taken in Palaiseau, France. Results show a majority of near-unity shape ratios as well as a strong correlation between shape ratios and temperature: The lowest temperatures lead to high shape ratios. The application of this technique to space-borne measurements would allow a large-scale classification of shape ratios in cirrus clouds, leading to better knowledge of the vertical variability of shapes, their dependence on temperature, and the formation processes of clouds.     

Genetic Dominant Variants in STUB1, Segregating in Families with SCA48, Display In Vitro Functional Impairments Indistinctive from Recessive Variants Associated with SCAR16

Variants in STUB1 cause both autosomal recessive (SCAR16) and dominant (SCA48) spinocerebellar ataxia. Reports from 18 STUB1 variants causing SCA48 show that the clinical picture includes later-onset ataxia with a cerebellar cognitive affective syndrome and varying clinical overlap with SCAR16. However, little is known about the molecular properties of dominant STUB1 variants. Here, we describe three SCA48 families with novel, dominantly inherited STUB1 variants (p.Arg51_Ile53delinsProAla, p.Lys143_Trp147del, and p.Gly249Val). All the patients developed symptoms from 30 years of age or later, all had cerebellar atrophy, and 4 had cognitive/psychiatric phenotypes. Investigation of the structural and functional consequences of the recombinant C-terminus of HSC70-interacting protein (CHIP) variants was performed in vitro using ubiquitin ligase activity assay, circular dichroism assay and native polyacrylamide gel electrophoresis. These studies revealed that dominantly and recessively inherited STUB1 variants showed similar biochemical defects, including impaired ubiquitin ligase activity and altered oligomerization properties of the CHIP. Our findings expand the molecular understanding of SCA48 but also mean that assumptions concerning unaffected carriers of recessive STUB1 variants in SCAR16 families must be re-evaluated. More investigations are needed to verify the disease status of SCAR16 heterozygotes and elucidate the molecular relationship between SCA48 and SCAR16 diseases.     

Formation of Singlet Oxygen by Photo–excitation of Substituted Aromatic Azo Compounds in Oxygenated Solution

Irradiation into the visible adsorption band of four trans–4–dialkylamino–4′-nitroazobenzenes not subject to azo–hydra–zone tautomerism leads to conversion of triplet oxygen to singlet oxygen. Evidence for formation of singlet oxygen is provided by characterization of cis–dibenzoylstilbene as the predominant oxidation product of tetraphenylcyclopenta–dienone and by inhibition of the oxidation by DABCO and other singlet oxygen quenchers. Addition of the same concentration of 2, 6–di–t–butyl–phenolhas essentially no effect. The rates of disappearance of the singlet oxygen scavengers bilirubin and 1, 3–diphenylisobenzofuran are also reduced in the presence of DABCO. Quantum yields of singlet oxygen formation between 0. 03–2 × W^-3 were obtained for the compounds examined in di–n–butylterephthalate. The singlet oxygen yield parallels the triplet yield obtained from the same azo compounds by laser flash photolysis.     

Nanoindentation study of the mechanical and damage behaviour of suspension plasma sprayed TiO2 coatings

TiO₂ coatings can be used as self-cleaning surfaces owing to their photocatalytic and hydrophilic properties. Suspension plasma spray (SPS) has proven to be a feasible and cheap technique for producing self-cleaning surfaces with acceptable photo-activity. This paper presents a nanoindentation study of the mechanical properties (hardness, Young's modulus and scratch resistance) of photoactive layers of suspension plasma sprayed TiO₂ coatings applied on to glass substrates. Microstructure observation showed that the rutile grains were surrounded by fine anatase crystals. Under the same spraying conditions, the resulting anatase/rutile concentrations varied depending on the cooling rate (the substrate being either cooled with water or in air). The results showed that higher concentrations of anatase, which is softer than rutile, reduced the scratch damage and increased the friction coefficient.     

Increasing the indoor humidity levels in buildings with ventilation systems: Simulation aided design in case of passive houses

In modern societies, people spend about 90 percent of their time inside buildings. The challenge of building physics is to ensure that buildings are planned, constructed and built to provide a comfortable and healthy working and living environment. As construction style has changed during recent years, the planning phase has to be much more precise and the need of simulation programs that respond to every little change arises. An increasing problem in Austria is the indoor humidity. In the field of renovated buildings with airtight new building envelopes, mould growth due to high indoor relative humidity (RH) is a persistent problem. On the other hand, in recently realized Austrian passive houses with an air treatment system, the low humidity level of the indoor air is a problem with which scientists have been struggling for some time. It has been observed in numerous measurements and it is also easily computationally detectable that in winter period the indoor relative humidity level often drops below 30% RH. Low and high relative humidity levels have negative effects on the comfort feeling and health of the occupants of the dwelling and should therefore be avoided. However, it is expensive to increase or decrease the humidity in houses mechanically. Therefore, the existing room moisture should be used sensibly in buildings with a ventilation system. In buildings with a high indoor humidity it is necessary to adjust the ventilation depended on moisture production. This paper focuses on low indoor humidity and presents some different methods by which the indoor relative humidity can be regulated. The effects of adapting parameters such as ventilation rate and buffering material in the dwelling were clearly reflected in the measured temperature and relative humidity. “BuildOpt_VIE” software developed at the Vienna University of Technology was used for the dynamic building simulation in this study.     

Predicting dynamic and thermal histories of agglomerated particles injected within a d.c. plasma jet

In this work, are presented the results of a model coupling both dynamic and thermal histories of a single zirconia particle injected into a d.c. plasma jet. The temperatures, chemical compositions and velocities mapping of the jet are forecast from the Jets&Poudres model derived from Genmix algorithm of Spalding and Patankar. This model is mainly improved by the use of close transport properties of gases given by T&TWinner data base. The model developed here calculates the dynamic and fly of a single particle fed in the jet and the coupling with the heat transfer and phase changes within this particle along its trajectory. These computations solved the Stefan problem in the particle and determine explicitly the position of the front solid/liquid. The ablation by evaporation and the coupled cooling is described according to the approach “Back pressure” of Knight. The model is used to the calculation of thermal and dynamic behaviors of agglomerated nanosized particles and the result compared with experimental one.