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See detailEffects of porosity on emergent synthetic spectra of massive stars in the X-ray domain
Hervé, Anthony ULiege; Rauw, Grégor ULiege

in Bulletin de la Societe Royale des Sciences de Liege (2011), 80

Massive stars possess powerful stellar winds. Studies over the last decade, including the analyses of X-ray emission-line profiles, revealed the importance of wind fragmentation and clumping and led to a ... [more ▼]

Massive stars possess powerful stellar winds. Studies over the last decade, including the analyses of X-ray emission-line profiles, revealed the importance of wind fragmentation and clumping and led to a downwards revision of the mass-loss rates. We present the first results of our code that allows to compare two models of wind fragmentation, and their consequences on the emergent X-ray spectra of massive stars. [less ▲]

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See detailEffects of positive end-expiratory pressure titration on gas exchange, respiratory mechanics and hemodynamics in anesthetized horses.
Ambrosio, Aline M.; Ida, Keila ULiege; Souto, Maria Tmr et al

in Veterinary Anaesthesia & Analgesia (2013), 40(6), 564-72

OBJECTIVE: To assess if positive end-expiratory pressure (PEEP) titration improves gas exchange and respiratory mechanics, without hemodynamic impairment in horses during anesthesia. DESIGN: Prospective ... [more ▼]

OBJECTIVE: To assess if positive end-expiratory pressure (PEEP) titration improves gas exchange and respiratory mechanics, without hemodynamic impairment in horses during anesthesia. DESIGN: Prospective, randomized study. ANIMALS: Thirteen isoflurane-anesthetized healthy horses. METHODS: After 60 minutes of anesthesia with spontaneous breathing, mechanical ventilation was initiated with an inspiratory-expiratory ratio of 1:2, PEEP of 5 cmH2O, tidal volume of 10-20 mL kg(-1) and respiratory rate adjusted to maintain normocapnia. Constant PEEP of 5 cmH2O was continued (control group; n = 6) or titrated (PEEP group; n = 7) by increasing and decreasing PEEP from 5 to 20 cmH2O at 15-minute intervals. The horses were instrumented with an arterial catheter to measure blood pressure and allow collection of blood for pH and blood gas analysis and a Swan-Ganz catheter for measurement of cardiac output (CO) using thermodilution. Cardiopulmonary assessment was recorded before PEEP titration and after 15 minutes at each PEEP value. RESULTS: In the PEEP group, static compliance (range) (Cst 278-463 mL cmH2O(-1)) was significantly higher and the shunt fraction (Q.s/Q.t 7-20%) and the alveolar-arterial oxygen difference [P(A-a)O2 95-325 mmHg] were significantly lower than in the control group [Cst of 246-290 mL cmH2O(-1), Q.s/Q.t of 16-19%, P(A-a)O2 of 253-310 mmHg; p < 0.05]. CO (mean +/- SEM) was lower in the PEEP group (23 +/- 2 L minute(-1)) at 20 cmH2O PEEP than in the control group (26 +/- 4 L minute(-1), p < 0.05), with no significant changes in heart rate, blood pressure or central venous pressure. CONCLUSIONS: PEEP titration significantly improved gas exchange and lung compliance, with a small decrease in CO at the highest PEEP level. CLINICAL RELEVANCE: Gas exchange and respiratory mechanics impairment during inhalation anesthesia can be treated using PEEP titration from 5 to 20 cmH2O, without clinically important hemodynamic effects in healthy horses. [less ▲]

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See detailEffects of preference and sensory modality on behavioral reaction in patients with disorders of consciousness
Heine, Lizette ULiege; Tillmann, Barbara; Hauet, Marjolaine et al

in Brain Injury (2017)

Background: Reliable evaluation of patients with unresponsive wakefulness syndrome (UWS) or in a minimally conscious state (MCS) remains a major challenge. It has been suggested that the expression of ... [more ▼]

Background: Reliable evaluation of patients with unresponsive wakefulness syndrome (UWS) or in a minimally conscious state (MCS) remains a major challenge. It has been suggested that the expression of residual cerebral function could be improved by allowing patients to listen to their favourite music. However, the potential effect of music on behavioural responsiveness, as well as the effect of preferred stimuli in other sensory modalities (e.g. olfaction), remain poorly understood. Objective: The aim of our study was to investigate the effect of sensory modality (auditory versus olfactory) and preference (preferred versus neutral) of the test stimuli on patients’ subsequent performance on the Coma Recovery Scale-Revised (CRS-R). Research design: Within-subject design because of inter-individual differences between patients. Methods and procedures: We studied four items from the CRS-R (visual pursuit using a mirror, auditory localization of the own name and two movements to command) in 13 patients (7 MCS; 6 UWS). Main outcomes and results: Auditory stimuli triggered higher responsiveness compared to olfactory stimuli, and preferred stimuli were followed by higher scores than did neutral stimuli. Conclusions: Findings suggest that preferred auditory stimuli at the bedside contribute to the expression of residual function and could improve the diagnostic assessment. [less ▲]

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See detailEffects of procaine and d-tubocurarine on the activity of membrane bound acetylcholinesterase
Foidart, Jean-Michel ULiege; Gridelet, J.

in Biochemical Pharmacology (1974), 23

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See detailEffects of process water recycling during flotation of copper and cobalt oxidised ores from Luiswishi deposit in the Democratic Republic of Congo
Shengo, Michel; Gaydardzhiev, Stoyan ULiege; Kalenga, Pierre

in Desalination and Water Treatment (2015), 55(7), 117

Laboratory flotation tests with copper–cobalt oxidized ore from the Luiswishi deposit in the Katanga province were done using process water being recycled to different degrees. Grade and recovery of ... [more ▼]

Laboratory flotation tests with copper–cobalt oxidized ore from the Luiswishi deposit in the Katanga province were done using process water being recycled to different degrees. Grade and recovery of copper and cobalt were followed by 10, 20 and 80% process to fresh water addition with the results from these conditions being compared to those without water recycling. When process water was recycled at 10%, 83.7% copper and 84.1% cobalt were recovered at the rougher stage bringing the cleaner stage to a concentrate with recovery of 53 and 60% for copper and cobalt, respectively. However, recycling process water, up to 20 and 80%, has reduced the recovery of copper in the final concentrate to 23 and 6%, respectively, and of cobalt to 46 and 27%, respectively. Monitoring of dissolved oxygen content, pulp pH and Es potential during flotation, coupled with thermodynamic estimation of the predominant chemical compounds in the system, has enabled to evaluate the effects on flotation from the undesirable compounds’ formation during process water recycling. DRIFT spectroscopy was used to identify the nature of the chemical compounds formed on malachite and heterogenite surface during their sulphidisation in the presence of thiosulphate ions. Thiosulphate ions depending on their concentration could promote or hinder malachite and heterogenite flotation by inducing changes in pulp physicochemical parameters or by altering mineral surface properties. [less ▲]

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See detailEffects of Processing on the Compositions and Physicochemical Properties of Fibre Concentrate from Cooked Fruit Pomaces
Rabetafika, Holy-Nadia ULiege; Bchir, Brahim ULiege; Aguedo, Mario ULiege et al

in Food and Bioprocess Technology (2013)

This study examined the influence of applied tech- nologies namely desugaring, grinding, and bleaching on the compositions (cellulose, hemicelluloses, lignins, and pectins), physicochemical properties ... [more ▼]

This study examined the influence of applied tech- nologies namely desugaring, grinding, and bleaching on the compositions (cellulose, hemicelluloses, lignins, and pectins), physicochemical properties (water-holding capacity (WHC), swelling capacity (SWC), oil-holding capacity (OHC)) and the colour of dietary fibre (DF) during the production of fibre concentrates from unusual cooked apple and pear pomaces. Thermogravimetric analysis (TGA) and optical microscopy were also performed to monitor process-induced modifica- tion. All the processing conditions affected the compositions and physicochemical properties of DF. The bleaching treat- ment induced the greatest changes on DF producing yellow cellulose-rich fibre concentrates with improved WHC from 3.2 to 10.0 g/g and improved SWC from 4.0 to 8.8 ml/g. Otherwise, reduction of the particle size influenced hydration properties and colours of DF. WHC and SWC tended to increase with the particle size whereas smaller granulometric size increased the lightness of fibres. Desugaring increased the DF content in both pomaces by 1.2-fold with slight modifica- tion of apple insoluble dietary fibre ratio. Fibre concentrates had improved WHC and SWC up to 1.4-fold. All processes had no significant effect (p < 0.05) on OHC of DF except with ultrafine apple fibre concentrates. Results showed that pro- cessing had overall positive effects on DF contents and hy- dration properties of pomaces from cooked fruits. Bleached fibre concentrates from apple pomace had the highest WHC (10.0 g/g) whereas that of pear had the highest fibre content (89.9 %). Fibres from cooked fruit pomaces may therefore be used as textural ingredients or functional foods. [less ▲]

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See detailEffects of prodelphinidins isolated from Ribes nigrum leaves on chondrocyte metabolism and COX activity
Angenot, Luc ULiege; Garbacki, Nancy ULiege; Damas, Jacques et al

Poster (2002, October 29)

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See detailEffects of prodelphinidins isolated from Ribes nigrum on chondrocyte metabolism and COX activity
Garbacki, Nancy ULiege; Angenot, Luc ULiege; Bassleer, C. et al

in Naunyn-Schmiedeberg's Archives of Pharmacology (2002), 365(6), 434-441

Articular diseases. such as osteoarthritis, is the clinical expression of the loss of cartilage function. COX inhibitors are widely used in the treatment of such pathologies for their beneficial effects ... [more ▼]

Articular diseases. such as osteoarthritis, is the clinical expression of the loss of cartilage function. COX inhibitors are widely used in the treatment of such pathologies for their beneficial effects on inflammation but often produce a negative activity on cartilage synthesis. In this study, we determined the effect of different prodelphinidins, the major compounds isolated from Ribes nigrum leaves, on the proteoglycans (PGs), type II collagen (coll. II) and prostaglandin E-2 (PGE(2)) production by differentiated human chondrocytes cultivated in long term (12 days) and in clusters as well as their inhibition potential on COX-1 and COX-2 in vitro. Gallocatechin trimer (GC-GC-GC) showed the higher stimulation of PGs and coll. II production (1 mug ml(-1)) and the synthesis of PGE(2) was significantly reduced by gallocatechin dimer (GC-GC), gallocatechin-epigallocatechin (GC-EGC) and GC-GC-GC at 10 and 100 mug ml(-1). The inhibition of PGE(2) synthesis was confirmed by the in vitro test on purified COX enzymes, showing the selectivity of prodelphinidins on COX-2. However, the prodelphinidins had no effects on COX activity in the whole blood assay. Our studies suggest that the prodelphinidins fractions from R. nigrum may be useful as an additive agent in the prevention of osteoarthritis. [less ▲]

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See detailEffects of Proglumide and Enprostil on Omeprazole-Induced Fundic Endocrine Cell Hyperplasia in Rats
Delwaide, Jean ULiege; Latour, Pascale ULiege; Gast, Pierrette ULiege et al

in Gastroentérologie Clinique et Biologique (1993), 17(11), 792-6

Long-term treatment with omeprazole induces hyperplasia of enterochromaffin-like cells, closely related to hypergastrinemia. We studied whether proglumide, an antagonist of gastrin/CCK receptor, and ... [more ▼]

Long-term treatment with omeprazole induces hyperplasia of enterochromaffin-like cells, closely related to hypergastrinemia. We studied whether proglumide, an antagonist of gastrin/CCK receptor, and enprostil, a synthetic prostaglandin E2 derivative, might inhibit this hyperplasia. Six groups of 8 rats were treated for 10 weeks: a) untreated controls; b) omeprazole 10 mumol/kg; c) proglumide 500 mg/kg; d) enprostil 30 micrograms/kg; e) association of omeprazole and proglumide; f) association of omeprazole and enprostil. Serum gastrin levels were measured at different times during treatment. After sacrifice, fundic argyrophil cells were assessed by Grimelius' staining. Serum gastrin levels and argyrophil cell density were not modified in proglumide- and enprostil-treated groups, as compared with controls. Omeprazole increased significantly these two parameters. When given with omeprazole, proglumide decreased significantly serum gastrin levels and argyrophil cell density, as compared to omeprazole alone, while enprostil did not modify significantly these two parameters. These results indicate that proglumide, but not enprostil, can counteract the omeprazole-induced argyrophil cell hyperplasia in rats. [less ▲]

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See detailEffects of prolactin deficiency on myelopoiesis and splenic T lymphocyte proliferation in thermally injured mice.
Dugan, Amy L.; Thellin, Olivier ULiege; Buckley, Donna J. et al

in Endocrinology (2002), 143(10), 4147-4151

The importance of prolactin (PRL) in mammopoiesis and milk production is undisputed. However, previous studies investigating the role of PRL in immune function have yielded inconsistencies. These ... [more ▼]

The importance of prolactin (PRL) in mammopoiesis and milk production is undisputed. However, previous studies investigating the role of PRL in immune function have yielded inconsistencies. These inconsistencies have led to our hypothesis that the immunomodulatory effects of PRL are only manifest under conditions in which the organism is subjected to stress. Thermal injury is a well-known stressor. The goal of this study was to determine whether the lack of PRL enhanced the negative effects of thermal injury-induced immune alterations utilizing a mouse model in which the PRL gene had been disrupted. Mice received either sham or burn treatment, and were sacrificed 4 days later. The immune parameters studied were the capacity of bone marrow cells to form granulocyte-macrophage colony forming units (GM-CFU) in the presence of granulocyte-macrophage colony stimulating factor, and the ability of the splenic T lymphocytes to proliferate in response to phytohemagglutin (PHA). As shown by others, our results reveal that burn increased the number of GM-CFU compared to sham controls; however, this elevation was only significant in the PRL-/- mice. Thermal injury increased PHA-stimulated proliferation of splenic T lymphocytes, however this increase was only significant in the PRL+/- group. We conclude that under conditions of a controlled stress event (thermal injury) [a] the increase in the GM-CFU is exaggerated in the absence of PRL, and [b] the enhancement of PHA-induced proliferation of splenic lymphocytes required PRL. This study supports the hypothesis that the immunomodulatory effects of PRL are manifest when the organism is subjected to stress. [less ▲]

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See detailEffects of propofol on endothelial cells subjected to a peroxynitrite donor (SIN-1).
Mathy, Marianne ULiege; Mouithys-Mickalad, Ange ULiege; Kohnen, S. et al

in Anaesthesia (2000), 55(11), 1066-71

We investigated the effect of propofol on endothelial cells subjected to the peroxynitrite (ONOO-) donor 3-morpholino sydnonimine (SIN-1). Cells were incubated overnight with 0.5, 1.0 or 2.0 mM SIN-1 ... [more ▼]

We investigated the effect of propofol on endothelial cells subjected to the peroxynitrite (ONOO-) donor 3-morpholino sydnonimine (SIN-1). Cells were incubated overnight with 0.5, 1.0 or 2.0 mM SIN-1, with or without 10-3 M propofol (Diprivan). Cytotoxicity, assessed by measuring the release of pre-incorporated 51Cr, increased when the concentration of SIN-1 increased, and was significantly decreased by 10-3 M propofol (90%, 78% and 28% of protection against 0.5, 1.0 and 2.0 mM SIN-1, respectively). Cell protection against 1 mM SIN-1 was tested with 0.03-1.0 mM propofol and this was compared to tyrosine, a target molecule for peroxynitrite. Propofol protected cells in a dose-dependent manner (r = 0.98; p < 0.001) and was as effective as tyrosine. Finally, using high-performance liquid chromatography, we demonstrated that propofol reacted with ONOO- more rapidly than did tyrosine, inhibiting nitrotyrosine formation. In the absence of propofol, 3.5 mM ONOO- with 1 mM tyrosine yielded 39.6% nitrotyrosine, but nitrotyrosine was not produced when 5 mM propofol was added. We conclude that propofol protects endothelial cells against the toxicity of ONOO-. The anti-oxidant properties of propofol can be partially attributed to its scavenging effect on peroxynitrite, a property that might be relevant in pathological situations involving a significant contribution of peroxynitrite to tissue damage. [less ▲]

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See detailEffects of protein source and cooking procedure on intestinal microbiota and on fermentation end-products in rats
POELAERT, Christine ULiege; Despret, Xavier; Portetelle, Daniel ULiege et al

Poster (2016, June)

Animal and plant proteins are major proteins sources in the human diet. After their enzymatic degradation in the upper gastro-intestinal tract, the undigested fraction of these proteins is available for ... [more ▼]

Animal and plant proteins are major proteins sources in the human diet. After their enzymatic degradation in the upper gastro-intestinal tract, the undigested fraction of these proteins is available for fermentation by the microbiota of the large intestine leading to the production of short-chain fatty acids (SCFA), branched-chain fatty acids (BCFA), ammonia, biogenic amines, sulphur metabolites, phenols and indoles. As some of these compounds have genotoxic and cytotoxic effects, protein fermentation is considered as detrimental to the host’s epithelial health. BCFA are usually used as a marker of intestinal protein fermentation. We studied in vivo the impact of proteins from animal and plant origin, raw or after a cooking procedure, on the composition of gut microbiota and on fermentation end-products. Weanling rats were used as models of the human gut microbiota. Eight experimental diets were formulated with beef meat (Longissimus dorsi), chicken meat (Pectoralis major), white pea beans (Phaseolus vulgaris), soybeans (Glycine max), used raw and cooked, as sole source of protein in the diet. One casein diet was used as control. All diets, formulated to contain 15% of raw protein, were given to seven rats for four weeks. After euthanasia, caecal contents were collected. Pyrosequencing analyses (Roche 454 GS Junior Genome Sequencer) were performed to study the microbial composition. SCFA and BCFA were measured using HPLC (Waters 2690). Microbial composition in the caecum is associated to the type of dietary protein and to the cooking procedure applied. The proportion of BCFA in the caecal content is mainly affected by the type of protein. So BCFA represent respectively 04-06% and 35-44% of total SCFA with diets based on plant and on animal proteins. In conclusion, both the type of protein and the cooking procedure could impact the gut microbiota in terms of composition and of fermentative capacity. [less ▲]

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See detailEffects of protein, essential amino acids, B-Hydroxy B-Methylbutyrate, creatine, Dehydroepiandrosterone and fatty acid supplementation on muscle mass, muscle strength and physical performance in older people aged 60 years and over. A systematic review of the litterature.
Beaudart, Charlotte ULiege; Rabenda, Véronique ULiege; Simmons, Michael et al

in Journal of Nutrition, Health & Aging (2017), (Online First),

Abstract: Objectives: The objective of this study was to perform a systematic review to investigate the effects protein, essential amino acids (EAA), β-hydroxy β-methylbutyrate (HMB), creatine ... [more ▼]

Abstract: Objectives: The objective of this study was to perform a systematic review to investigate the effects protein, essential amino acids (EAA), β-hydroxy β-methylbutyrate (HMB), creatine, dehydroepiandrosterone (DHEA) and fatty acid supplementation on muscle mass, muscle strength and physical performance of elderly subjects. Methods: Using the electronic databases MEDLINE and EMBASE we identified RCTs published until February 2016 which assessed the effects of these nutrient supplementation on muscle strength, muscle mass or physical performance. Study selection and data extraction were performed by two independent reviewers. Results: Search strategy allowed us to identify 23 RCTs. Among them, four used proteins as nutritional supplement, seven EAAs, six creatine, four DHEA and finally, two HMB. From our systematic review, it seems that the effects of these supplementations on muscle health are rather limited. Only consistent effects of EAA supplementation on physical performance (3 out of the 4 RCTs using EAA supplementation found significant effect of this supplementation on physical performance) and HMB supplementation on muscle mass (all the 2 identified RCTs using HMB supplementation found significant effect of this supplementation on muscle mass) have been found across studies. No consistent effects were found for the other types of dietary supplementation. Because of the important limitations in study design, inconsistency and lack of directness, the overall quality of the evidence was judged to be low or very low using the GRADE system. Conclusion: This systematic review showed a limited effect of nutritional supplementation on muscle mass, muscle power and physical function. Inconsistent positive effects were observed for some specific supplementations but the results only concerned one aspect of the muscle. Well designed and appropriately powered RCTs are needed to provide evidence for appropriate clinical recommendations. [less ▲]

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See detailEffects of pulsatile delivery of insulin and glucagon in humans.
Paolisso, G.; Scheen, André ULiege; Albert, Adelin ULiege et al

in American Journal of Physiology (1989), 257(5 Pt 1), 686-96

The purpose of the present study was to investigate the respective effects of continuous intravenous delivery of both insulin and glucagon compared with those of pulsatile insulin (and continuous glucagon ... [more ▼]

The purpose of the present study was to investigate the respective effects of continuous intravenous delivery of both insulin and glucagon compared with those of pulsatile insulin (and continuous glucagon), pulsatile glucagon (and continuous insulin) and both hormones administered in a pulsatile manner (but out of phase) on various parameters of glucose turnover. The study was performed on six healthy male volunteers submitted to a 325-min glucose-controlled glucose intravenous infusion using the Biostator. The endogenous secretion of pancreatic hormones was inhibited by somatostatin (2 micrograms/min). Four combinations of continuous and pulsatile infusions of insulin and glucagon were performed on different days and in random order. The amounts of hormone infused were identical in all instances and were 0.2 mU.kg-1.min-1 (continuous insulin), 67 ng/min (continuous glucagon), 1.3 mU.kg-1.min-1 and 435 ng/min with a switching on-off length of 2-11 min (for intermittent insulin and glucagon delivery, respectively). In the case of pulsatile administration of both hormones, the pulses of insulin and glucagon were given out of phase with a 6-min interval. Blood glucose levels and glucose infusion rate were monitored continuously by the Biostator, and classic methodology using a D-[3-3H]glucose infusion allowed to study glucose turnover. When compared with pulsatile insulin and continuous glucagon, pulsatile glucagon and continuous insulin were characterized by a significantly higher endogenous (hepatic) glucose production. When both insulin and glucagon were delivered in a pulsatile manner, the effect of pulsatile glucagon was predominant, maintaining a high endogenous glucose production. Under no circumstance was an effect on glucose utilization or clearance detected. This study demonstrates that pulsatile delivery of insulin or glucagon in humans has greater effects in modulating endogenous glucose production than continuous infusion. Furthermore, when both insulin and glucagon are delivered intermittently and out of phase, the stimulatory effect of glucagon on endogenous glucose production prevails over the inhibitory effect of insulin. [less ▲]

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See detailThe effects of purified Z- and E-guggulsterones from guggul-gum extract on human preadipocytes proliferation and differentiation through the study of gene expression of adipose markers.
Hanon, Emilien ULiege; Keophiphath, Mayoura; Jacquemond-Collet, Ingrid et al

Poster (2009)

The rising prevalence of obesity within both industrialized and emerging societies is a major public health problem. Indeed obesity is a usual risk factor in the development of metabolic and ... [more ▼]

The rising prevalence of obesity within both industrialized and emerging societies is a major public health problem. Indeed obesity is a usual risk factor in the development of metabolic and cardiovascular diseases which nowadays rank among the highest causes of premature death. Therefore, modulating fat mass expansion represents a worldwide challenge. In this context, adipocyte differentiation, which corresponds to the cellular transition of a fibroblastic cell (the preadipocyte) to a highly specialized cell accumulating triglycerides (the adipocyte), is a decisive process in the expansion of adipose tissue during life span and consequently, in the development of obesity. Adipogenesis markers such as PPARg2, C/EBPa, lipoprotein lipase (LPL), perilipin (PLIN) and the adipokines (leptin and adinopectin) are known to be expressed throughout the different stages of adipocyte differentiation. Guggulsterones are the principal bioactive steroidal components found in the oleoresin (guggul gum) collected from the indian guggul tree, Commiphora mukul (Hook, ex Stocks) Engl. The objective of this study was to investigate the effects of the two purified diastereoisomeric forms of guggulsterones (Z- and E-) on the human preadipocytes proliferation and differentiation. [less ▲]

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See detailEffects of raloxifene on bone mineral density and biochemical markers of bone turnover in postmenopausal women with osteoporosis : 4-year results from the MORE trial
Delmas, PD; Ensrud, KE; Harper, K et al

in Journal of Bone and Mineral Research (2000), 15(S1), 556

Detailed reference viewed: 15 (1 ULiège)