Foraging behaviour of sympatric Antarctic and subantarctic fur seals: does their contrasting duration of lactation make a difference?

The duration of periods spent ashore versus foraging at sea, diving behaviour, and diet of lactating female Antarctic (Arctocephalus gazella, AFS) and subantarctic (A. tropicalis, SFS) fur seals were compared at Iles Crozet, where both species coexist. The large disparity in lactation duration (SFS: 10 months, AFS: 4 months), even under local sympatry, has led to the expectation that AFS should exhibit higher foraging effort or efficiency per unit time than SFS to allow them to wean their pups in a shorter period of time. Previous evidence, however, has not supported these expectations. In this study, the distribution of foraging trip durations revealed two types of trips: overnight (OFT, <1 day) and long (LFT, >1 day), in common with other results from Macquarie Island. However, diving behaviour differed significantly between foraging trip types, with greater diving effort in OFTs than in LFTs, and diving behaviour differed between fur seal species. OFTs were more frequent in SFS (48%) than in AFS (28%). SFS performed longer LFTs and maternal attendances than AFS, but spent a smaller proportion of their foraging cycle at sea (66.2 vs. 77.5%, respectively). SFS dove deeper and for longer periods than AFS, in both OFTs and LFTs, although indices of diving effort were similar between species. Diel variation in diving behaviour was lower among SFS, which foraged at greater depths during most of the night time available than AFS. The diving behaviour of AFS suggests they followed the nychthemeral migration of their prey more closely. Concomitant with the differences in diving behaviour, AFS and SFS fed on the same prey species, but in different proportions of three myctophid fish (Gymnoscopelus fraseri, G. piabilis, and G. nicholsi) that represented most of their diet. The estimated size of the most important fish consumed did not vary significantly between fur seal species, suggesting that the difference in dive depth was mostly a result of changes in the relative abundance of these myctophids. The energy content of these fish at Iles Crozet may thus influence the amount and quality of milk delivered to pups of each fur seal species. These results contrast with those found at other sites where both species coexist, and revealed a scale of variation in foraging behaviour which did not affect their effort while at sea, but that may be a major determinant of foraging efficiency and, consequently, maternal investment.

Functional extruded snack products based on chickpea (Cicer arietinum L.) and fenugreek (Trigonella foenum-graecum) flours

Background – Chickpea and fenugreek are both legumes that confer several nutritional and functional virtues, especially to diabetes and associated metabolic syndrome conditions. They are high in protein and fibre, low in fat and prove to be low glycaemic. They also provide a gluten-free alternative to those suffering from celiac disease. Though these seeds are locally available, hardly any products appear on the supermarket shelves.
Objectives – The aim was to utilise the health and nutritional benefits of chickpea and fenugreek and develop acceptable snack products by extrusion technology.
Design – Preliminary trials were conducted with different proportions of rice and chickpea at a range of extruder conditions to optimise the raw material and processing conditions. Studies were then conducted at optimum processing conditions using a 7:3 chickpea and rice combination replacing with 2% fenugreek or 5, 10, 15 and 20% FenuLifeÒ (deodorized fenugreek powder). Products were evaluated for their physical (expansion, crunchiness and colour) and sensory ( texture, colour, flavour and overall acceptability) characteristics in order to identify their suitability as snack products.
Outcomes – Addition of chickpea up to 70% with rice showed increased expansion and stable product characteristics. Addition of fenugreek and FenuLifeÒ, indicated slight reduction in product expansion (radial) and crunchiness. However, the product made with 20% FenuLifeÒ had significant changes in expansion, crunchiness and colour values. The median scores of sensory evaluation indicated that all products were within the acceptable range. Inclusion of fenugreek showed lower ratings for flavour due to the strong bitter taste of fenugreek. There were no significant differences between products containing FenuLifeÒ (5-15%) in their colour, flavour, texture and overall quality.
Conclusion – This study demonstrates an opportunity for using chickpea and fenugreek in functional product development. Fenugreek in the form of deodorize powder (fenulifeÒ) could be incorporated up to 15% in a mixture of chickpea and rice to develop snack products of acceptable physical and sensory properties.

Extruded products with Fenugreek (Trigonella foenum-graecium) chickpea and rice: Physical properties, sensory acceptability and glycaemic index

The present study investigated the effects of fenugreek flour (Trigonella foenum-graecum) and debittered fenugreek polysaccharide (FenuLife^®) inclusion on the physical and sensory quality characteristics, and glycaemic index (GI) of chickpea–rice based extruded products. Based on preliminary evaluation with different proportions of chick pea and rice, a blend of 70:30 chickpea and rice was chosen as the control for further studies. The control blend, replaced with fenugreek flour at 2%, 5% and 10%, or fenugreek polysaccharide at 5%, 10%, 15% and 20%, was extruded at the optimum processing conditions as specified in the detailed study. The extruded products were evaluated for their physical (moisture retention, expansion, hardness, water solubility index (WSI) and water absorption index (WAI)), sensory (flavor, texture, color and overall acceptability) characteristics and in vitro GI to evaluate their suitability as extruded snack products.

Due to the distinct bitter taste, inclusion of fenugreek flour was not acceptable at levels more than 2% in extruded chickpea based products. Addition of fenugreek polysaccharide resulted in slight reduction in radial expansion (P < 0.05), while longitudinal expansion increased. WAI increased while WSI decreased compared to the control (P < 0.05). The mean scores of sensory evaluation indicated that all products containing fenugreek polysaccharide up to 15% were within the acceptable range. There were no significant differences (P > 0.05) between products containing 5–15% fenugreek polysaccharide in their color, flavor, texture and overall quality.

Fenugreek, in the form of debittered polysaccharide (FenuLife^®) could be incorporated up to a level of 15% in a chickpea–rice blend to develop snack products of acceptable physical and sensory properties with low GI Index.

Waist circumference, waist-hip ratio and BMI and their correlation with cardiovascular risk factors in Australian adults

Objectives. To compare body mass index (BMI), waist circumference and waist–hip ratio (WHR) as indices of obesity and assess the respective associations with type 2 diabetes, hypertension and dyslipidaemia.

Design and setting. A national sample of 11 247 Australians aged ≥25 years was examined in 2000 in a cross-sectional survey.

Main outcome measures. The examination included a fasting blood sample, standard 2-h 75-g oral glucose tolerance test, blood pressure measurements and questionnaires to assess treatment for dyslipidaemia and hypertension. BMI, waist circumference and WHR were measured to assess overweight and obesity.

Results. The prevalence of obesity amongst Australian adults defined by BMI, waist circumference and WHR was 20.8, 30.5 and 15.8% respectively. The unadjusted odds ratio for the fourth vs. first quartile of each obesity measurement showed that WHR had the strongest relationship with type 2 diabetes, dyslipidaemia (women only) and hypertension. Following adjustment for age, however, there was little difference between the three measures of obesity, with the possible exceptions of hypertension in women, where BMI had a stronger association, and dyslipidaemia in women and type 2 diabetes in men, where WHR was marginally superior.

Conclusions. Waist circumference, BMI and WHR identified different proportions of the population, as measured by both prevalence of obesity and cardiovascular disease (CVD) risk factors. Whilst WHR had the strongest correlations with CVD risk factors before adjustment for age, the three obesity measures performed similarly after adjustment for age. Given the difficulty of using age-adjusted associations in the clinical setting, these results suggest that given appropriate cut-off points, WHR is the most useful measure of obesity to use to identify individuals with CVD risk factors.

Landfill leachate treatment using thermophilic membrane bioreactor

This study was undertaken to investigate the performance of aerobic thermophilic membrane bioreactor (MBR) treating raw landfill leachate from two landfill sites in Thailand (Pathumthani site and Ram Indra site). The leachates from these sites were mixed in different proportions to produce a BOD/COD ratio of 0.39, 0.57, and 0.65, which was investigated in 3 experimental runs. The COD, ammonia, and TKN composition of the mixed leachate was 12,000, 1700 and 1900 mg/L, respectively. BOD was supplemented with glucose and soy protein. The system was operated at 45 degrees C and at a hydraulic retention time (HRT) of 24 hrs. The membrane used was a ceramic membrane with an ‘‘outside-in’’ flow mode and consisted of 22 open fibres with an inner diameter of approximately 2 mm. The COD removal rate increased from an average value of 62–79% while ammonia removal efficiency decreased from 75 to 60% with gradual increase in BOD. Furthermore, a high BOD removal efficiency (97–99%) was also observed. This clearly indicates that thermophilic system is highly suitable for COD and BOD removal especially at elevated organic loading. However, the system does not favor high nitrogen content wastewaters as the ammonia removal efficiency dropped with increasing BOD/COD ratio. Similar trends were found in TKN analysis as well. However, this system could serve as a pretreatment in removing ammonia. The concentrations of soluble and bound extra-cellular polymeric substances (EPS) found in thermophilic MBR were higher when compared to the corresponding concentrations in a mesophilic MBR, which led to a higher rate of fouling in the thermophilic membrane.

Spatial ecology of an apex predator over an urban to forest gradient

This research focused on predicting habitat suitability for the Powerful Owl over an urbanization gradient. Zones along the gradient provided different proportions of habitat for this species and tied in with availability of key resources. Urban environments provided limited habitat for the Powerful Owl and may potentially be acting as ecological traps.

Functionalization of bamboo pulp fabrics with noble metal nanoparticles

Noble metal (gold and silver) nanoparticles (NPs) were synthesized in-situ on bamboo pulp fabrics. The gold NPs were reduced by bamboo pulp fabrics and bonded to fibers under heating, and an alkaline condition was needed to synthesize silver NPs in the presence of bamboo pulp fabrics. The synthesized gold and silver NPs endowed bamboo pulp fabrics with different colors because of their localized surface plasmon resonance (LSPR) property. The colors of the fabrics treated with metal NPs were extended through complex synthesis of gold and silver NPs in different proportions. The bamboo pulp fabrics treated with noble metal NPs showed good fastness to light and rubbing. In addition, the gold and silver NPs imparted bamboo pulp fabrics excellent UV protection property and remarkable antibacterial activity.

Diesel engine performance and emission study using soybean biodiesel blends with fossil diesel

Biodiesel is an ecofriendly and renewable source of energy which can be used as a sustainable alternative fuel fordiesel engine. The study investigated engine performance and emission using soybean biodiesel blends with fossildiesel. The physio-chemical fuel properties of the biodiesel were determined using ASTM and EN standards. Thebiodiesel was blended in different proportions like 5% biodiesel and 95% diesel (by volume) denoted as B5, similarlyB10, B20 and B50. The biodiesel blends were tested in a multicylinder, diesel engine coupled with electromagneticdynamometer, under ISO 8178-4 test procedure. The study found that the biodiesel blends produces less brakepower, brake torque and relatively higher brake specific fuel consumption compared with diesel fuel. However, thesefules significantly reduces exhaust gases namely, CO, CO2 and HC but emits a bit more NOx compared with diesel.The reduction in emissions were different for each biodiesel blends. The study concluded that both B5 and B10blends are the optimum blends that produce more consistant and expected results compared with other blends.

Alterations in the proportions of skeletal muscle proteins following a unilateral lesion to the substantia nigra pars compacta of rats

It is well established that mammalian skeletal muscles exhibit a considerable degree of plasticity and one of the main determining factors of this plasticity is the activity pattern and duration of motoneurone discharge. Lesions to the right substantia nigra pars compacta (SNpc) of six adult rats were made to determine whether altered output from the SNpc ultimately leads to a change in the expression of proteins in contralateral skeletal muscles. After 4 months, altered motor performance was identified by the administration of amphetamine. After 7 months, 30–70% of dopaminergic cells in the SNpc had been destroyed. The protein content of muscles was then quantified from densitometric scans of gels, and expressed as a % of the amount of actin (the protein used as a reference in this study). The lesion affected the expression of different protein isoforms in the fast- and slow-twitch muscles. In slow-twitch soleus muscles, the lesion decreased the proportion of α-tropomyosin and increased the proportion of β-tropomyosin. In the fast-twitch extensor digitorum longus muscles, the lesion increased the proportion of the fast isoform of troponin-T_1f, and decreased the proportions of the two isoforms of myosin light chain. This study establishes a connection between the chronic effects of a lesion to the SNpc, with a loss of dopaminergic neurones, impaired motor performance, and altered expression of proteins in skeletal muscle. The implication of these results is that the altered motor function observed in Parkinson’s disease may be associated with alterations to the expression of skeletal muscle proteins.