Trial participants were mainly male, except in trials including r

Trial participants were mainly male, except in trials including rotator cuff tears, and elbow and Achilles tendinopathies. Three trials were judged as being at Selleck KU55933 low risk of bias; the other 16 were at high or unclear risk of bias relating to selection, detection, attrition or selective reporting, or combinations of these. The methods of preparing platelet-rich plasma (PRP) varied and lacked standardisation and quantification of the PRP applied to the patient. We were able to pool data for our primary outcomes (function, pain, adverse events) for a maximum of 11 trials and 45% of participants. The evidence for all primary outcomes

was judged as being of very low quality. Data assessing function in the short term(up to three months) were pooled from four trials that assessed PRT in three clinical conditions and used four different measures. These showed no significant difference

between PRT and control (SMD 0.26; 95% confidence interval (CI) -0.19 to 0.71; P value 0.26; I-2 = 51%; 162 participants; positive values favour PRT). Medium-term function data (at six months) were pooled from five trials that assessed PRT in five clinical conditions and used five different measures. These also showed no difference between groups (SMD -0.09, 95% CI -0.56 to 0.39; P value 0.72; I-2 = 50%; 151 participants). Long-term function data (at one Autophagy inhibitor mouse year) were pooled from 10 trials that assessed PRT in five clinical conditions and used six different measures. These also showed no difference between groups (SMD 0.25, 95% CI -0.07 to 0.57; P value 0.12; I-2 = 66%; 484 participants). Although the 95% confidence intervals indicate the possibility of a poorer outcome in the PRT group up to a moderate difference in favour of PRT at short-and long-term follow-up, these do not translate into clinically relevant

differences. Data pooled from four trials that assessed PRT in three clinical conditions showed a small Aurora Kinase inhibitor reduction in short-term pain in favour of PRT on a 10-point scale (MD -0.95, 95% CI -1.41 to -0.48; I-2 = 0%; 175 participants). The clinical significance of this result is marginal. Four trials reported adverse events; another seven trials reported an absence of adverse events. There was no difference between treatment groups in the numbers of participants with adverse effects (7/241 versus 5/245; RR 1.31, 95% CI 0.48 to 3.59; I-2 = 0%; 486 participants). In terms of individual conditions, we pooled heterogeneous data for long-term function from six trials of PRT application during rotator cuff tear surgery. This showed no statistically or clinically significant differences between the two groups (324 participants). The available evidence is insufficient to indicate whether the effects of PRT will differ importantly in individual clinical conditions.

The physiological condition of pheasants in each treatment pen wa

The physiological condition of pheasants in each treatment pen was assessed before and after the laying season. In flock pens, the behaviour of spectacled and non-spectacled pheasants was also assessed weekly. Detailed records of egg collections and mortality were also kept. Spectacles had no effect on the behaviour of male pheasants but affected the behaviour of females by reducing pecking and increasing head shaking/scratching. Although spectacles halved feather damage in females, and

at least halved incidences of skin damage in both sexes, they increased bill and nostril damage in females while causing no detectable damage in males. Egg collections and mortality rates did not differ between spectacled and non-spectacled pens.”
“The conversion of lignocellulose into fermentable sugars is considered a promising alternative for increasing ethanol production. Higher fermentation yield has been achieved through the process PF-03491390 of simultaneous saccharification and fermentation (SSF). In this study, a comparison was performed between the yeast species Saccharomyces cerevisiae and Kluyveromyces marxianus for their potential use in SSF process. Three strains of S. cerevisiae NF-��B inhibitor were evaluated: two are widely used in the Brazilian ethanol

industry (CAT-1 and PE-2), and one has been isolated based on its capacity to grow and ferment at 42 A degrees C (LBM-1). In addition, we used thermotolerant strains of K. marxianus. Two strains were obtained from biological collections, ATCC 8554 and CCT 4086, and one strain was isolated based on its fermentative capacity (UFV-3). SSF experiments AMN-107 revealed that S. cerevisiae industrial strains (CAT-1 and PE-2) have the potential to produce

cellulosic ethanol once ethanol had presented yields similar to yields from thermotolerant strains. The industrial strains are more tolerant to ethanol and had already been adapted to industrial conditions. Moreover, the study shows that although the K. marxianus strains have fermentative capacities similar to strains of S. cerevisiae, they have low tolerance to ethanol. This characteristic is an important target for enhancing the performance of this yeast in ethanol production.”
“Extracorporeal circulation (ECC) and hypothermia are routinely used in cardiac surgery to maintain stable circulatory parameters and to increase the ischaemic tolerance of the patient. However, ECC and hypothermia cause platelet activation and dysfunction possibly followed by a devastating coagulopathy. Stimulation of the adenosinediphosphate (ADP) receptor P2Y12 plays a pivotal role in platelet activation. This experimental study tested P2Y12 receptor blockade as an approach to protect platelets during ECC.\n\nHuman blood was treated with the short-acting P2Y12 blocker cangrelor (1 M, t(1/2)5 min) or the P2Y12 inhibitor 2-MeSAMP (100 M) and circulated in an ex vivo ECC model at normothermia (37C) and hypothermia (28C).

The kinetic studies of adsorption

for lead and cadmium io

The kinetic studies of adsorption

for lead and cadmium ions were found to obey a pseudo-second-order model and the adsorption of both ions was found to fit the Langmuir isotherm. The grafted fishbone was effectively used as a sorbent for the removal of Pb2+ and Cd2+ ions from aqueous solution. (C) 2013 Elsevier B.V. All rights reserved.”
“The grape has been classified as a non-climacteric fruit with a relatively low physiological activity. However, some studies report that transient increase Selleckchem FK228 of endogenous ethylene production occurs just before verasion. Major problems after harvest include stem browning, berry shattering, wilting of berry, and gray mold caused by Botrytis cinerea. The grape is stored at -1 to 0 degrees C with 90 to 95% RH. Constant low temperature and high RH are important to control water loss and decay. see more Preharvest applications

of chitosan, abscisic acid, ethephon, or ethanol improve grape quality (skin color, decay, and weight loss) and shelf-life. Chitosan, UV irradiation, eugenol or thymol, sulfur dioxide, and chlorine dioxide gas are treated on grape after harvest in order to extend shelf-life and preserve quality. Controlled atmosphere or modified atmosphere packaging can be used as supplemental treatments to extend postharvest-life. 2-5% O(2) + 1-3% CO(2) is currently recommended for table grapes. SO(2) is used for decay control. 10-15% CO(2) in air can be used to control gray mold. Optimum range of temperature, relative humidity, and atmospheric composition depends on the cultivar.”
“In the present study, to enhance the tensile and fracture toughnesses of epoxy/clay composites without compromising the strength, a modifying copolymer in-situ synthesized for clay modification during epoxy curing was incorporated to form an interpenetrating network (IPN) structure within epoxy network, leading to a double IPN structure. The IPN structure click here formed between

the clay and the modifying copolymer via ionic interaction was reversible and flexible, and expected to dissipate energy more efficiently than those involving covalent bonding or other physical interactions in polymer intercalated composites. The advantage of this double IPN structure lies in itself, which is that the two IPNs are topological interlocking within each other to make the matrix strong and tough. And our results showed that a balanced improvement in both strength and toughness of the epoxy/clay nanocomposite could be obtained by this design. (C) 2014 Elsevier Ltd. All rights reserved.”
“Microbial communities have the potential to control the biogeochemical fate of some radionuclides in contaminated land scenarios or in the vicinity of a geological repository for radioactive waste. However, there have been few studies of ionizing radiation effects on microbial communities in sediment systems.


“A strain of Pseudomonas aeruginosa isolated from a site c


“A strain of Pseudomonas aeruginosa isolated from a site contaminated with refined oil products exhibited demulsification capabilities against Tween 80-Span 80 stabilized oil-in-water (O/W), Tween 80-stabilized PP2 clinical trial water-in-oil (W/O) model emulsions (kerosene-water), and an industrial emulsion (Daido Dairoll PA-5A). GC-MS analysis confirmed the presence of fatty acids and carbohydrates in the extracellular biodemulsifier. The demulsifying activity of cells and culture supernatants was favored by growth in media containing 1% diesel oil. There was a correlation between culture age, de-emulsification and

cellular hydrophobicity, and highest activities were observed for cells and supernatants from 96-h cultures. Activity increased with addition of up to 60

mg cells or 300 mu L supernatant to emulsions. The activity was relatively stable at 20-40 degrees C and to freezing, but was reduced by 69% by washing the cells with chloroform-methanol-water. This demulsifier has potential for application in biotreatment of emulsified oily wastewaters to promote recovery and/or degradation of oil. (C) 2012 Elsevier Ltd. All rights reserved.”
“Glasses of the composition 19Li(2)O-20PbO-20B(2)O(3)-30SiO(2)-(10-x) WH-4-023 Bi2O3-1Fe(2)O(3): xIn(2)O(3) with six values of x (0 to 5.0) were synthesized. Dielectric properties viz., dielectric constant, epsilon’(omega), loss, tan delta, ac conductivity, sigma(ac), electric modulus, M(omega) over HSP990 order wide ranges of frequency and temperature and also dielectric break down strength have been studied as a function of In2O3 concentration. The temperature

dispersion of real part of dielectric constant, epsilon’ (omega) has been analyzed using space charge polarization model. The dielectric loss (and also the electric moduli) variation with frequency and temperature exhibited relaxation effects and these effects were attributed to the divalent iron ion complexes. The ac conductivity exhibited maximal effect, whereas the activation energy for the conductivity demonstrated minimal magnitude at about 1.0 mol% of In2O3. The conductivity mechanism is understood due to the polaronic transfer between Fe2+ and Fe3+ ions. The low temperature ac conductivity mechanism is explained following the quantum mechanical tunneling model. Spectroscopic studies viz., optical absorption and ESR spectra have revealed that the. redox ratio (Fe2+/Fe3+) is maximal when the concentration of In2O3 is similar to 1.0 mol%. The higher values of dielectric parameters observed at 1.0 mol% of In2O3 are attributed to the presence of iron ions largely in divalent state and act as modifiers. The analysis of these results together with spectroscopic studies has indicated that when In2O3 is present in the glass matrix in higher concentrations (more than 1.0 mol%) iron ions predominantly exist in trivalent state, occupy substitutional positions and make the glass more rigid.

Zingiberaceae), was found to be a

Zingiberaceae), was found to be a Bucladesine in vivo potential anti-inflammatory agent. The present study aimed to investigate the effects and explore the protective mechanism of curcumin on lipopolysaccharide (LPS)-induced kidney inflammation in mice using gene chip and pathological technology. Nine SPF Kunming mice (aged 6-8 weeks, weighing 20-25 g) were divided into three groups. Saline and LPS were injected intraperitoneally in a normal control group and a model group, respectively. Mice in the treatment group were first injected with curcumin (5 mg/kg) for 3 days before being

injected with LPS (5 mg/kg). Kidney tissues were harvested at 6 h after treatment. Parts of kidney were fixed with 10 % formaldehyde for HE, Periodic acid-Schiff staining, and immunohistochemistry. Affymetrix gene chips (mouse 430 chip) were used to detect the renal gene expression profile, and the results were analyzed using bioinformatics methods. The renal gene expression

profile showed that there are 148 Affy IDs (up-down group) whose levels of gene expression were increased after LPS stimulation and decreased by curcumin treatment and that there are 133 Affy IDs (down-up group) exhibiting the opposite trend. In the differentially expressed genes of the up-down group, 21 Gene Ontology (GO) genes were selected by screening function (P a parts per thousand currency signaEuro parts per thousand 0.01). In the biological processes, most

of the genes were found to be related to the genes of regulation ACY-738 supplier of macrophage activation and macrophage activation-associated genes. In the cellular GDC-0973 supplier localization, there were four functional GO genes (P a parts per thousand currency signaEuro parts per thousand 0.01); in the molecular structure, there were seven functional GO genes (P a parts per thousand currency signaEuro parts per thousand 0.01). In the down-up group, there were functional GO genes (P a parts per thousand currency signaEuro parts per thousand 0.01) and one functional GO gene (P a parts per thousand currency signaEuro parts per thousand 0.01) in the biological process and the cellular localization, respectively. Macrophage infiltration could be observed as early as 6 h after LPS stimulation. Pretreatment with 5 mg/kg of curcumin significantly decreased the macrophage infiltration. At 6 h after LPS injection, significant decreased expression of M6PRBP-1 and NEDD-4 was observed in renal tissue. On the other hand, pretreatment with curcumin significantly increased renal M6PRBP-1 and NEDD-4 expression. In this study, we also found the signaling pathway and the possible target gene of the protective effects of curcumin on endotoxin-induced renal inflammation. The kidney gene expression profile in the inflammatory state was clarified by using gene chip technology. Furthermore, we confirmed that curcumin treatment can change the gene expression profile.

Conclusion: In conclusion, this study has shown that polidocanol

Conclusion: In conclusion, this study has shown that polidocanol injection around the dorsal flap in the rat is a safe and easy method for nonsurgical delay. The results have shown a flap survival benefit that is superior to controls and equivalent to surgical delay. The clinical application of polidocanol, already in clinical practice for occlusal of telangiectasias, for surgical delay appears feasible. (C) 2014 British MLN2238 price Association of Plastic, Reconstructive

and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.”
“BACKGROUND AND OBJECTIVES: Though core muscles strengthening using upper limbs in various positions and lower limbs in lying have been studied previously in patients with chronic low back pain (CLBP), no study has specifically looked in to the effects of a training program that requires prior motor planning in standing (functional ALK cancer position). The objective of this study was to evaluate the effectiveness of star excursion balance test (SEBT) grid training in improving the outcomes in patients with CLBP. MATERIALS AND METHOD: Sixty patients with mechanical CLBP who fulfilled our criteria were randomized in to two groups; experimental group

received physical diagnostic specific interventions, core muscles strengthening and muscles training using the SEBT grid. The participants in control group received stationary cycling instead of SEBT grid training and the other interventions were uniform. The duration of study was 4 weeks. The dependent variables were analyzed using repeated measures 2 x 3 ANOVA. RESULTS: At the end of study, both the groups showed a significant reduction in disability and improvement in strength and endurance (p smaller than 0.05). Post-hoc analysis showed that SEBT grid training was better than conventional exercises. Follow-up at 16 weeks revealed a statistically insignificant loss in strength and endurance in control group patients. This reduction was not associated ATM signaling pathway with an increase in disability score. The experimental group patients continued showing improvement. CONCLUSION: The results of our study show that core muscles strengthening

using a SEBT grid are more effective than conventional programs. We hypothesize SEBT training to have a significant role in skill learning. We recommend SEBT grid training to be incorporated in the treatment planning of persons with CLBP.”
“Despite the mesocorticolimbic dopaminergic pathway being one of the main substrates underlying stimulating and reinforcing effects induced by psychostimulant drugs, there is little information regarding its role in their effects at the immune level. We have previously demonstrated that acute exposure to amphetamine (5 mg/kg, i.p.) induced an inhibitory effect on the splenic T-cell proliferative response, along with an increase in the methionine(met)-enkephalin content at limbic and immune levels, 4 days after drug administration.


“Fryns syndrome (FS) is a multiple congenital anomaly synd


“Fryns syndrome (FS) is a multiple congenital anomaly syndrome, inherited as an autosomal recessive defect with variable expression. The authors report a newborn with FS, whose mother had two previous affected pregnancies with the infants having

variable phenotypic expression. FS is characterized by craniofacial dysmorphism, diaphragmatic hernia and distal limb hypoplasia. This is the first published report from India describing a case of FS with familial recurrence, which would serve further to illustrate the clinical variability of this disorder.”
“As a newly developed singular value decomposition of the reduced see more quaternion matrix (SVDRQ), the two reduced quaternion AZD2014 solubility dmso unitary matrices can effectively capture

the intrinsic geometric structures and smooth contours of color texture image. The projection vector by the two unitary matrices is used as dominant features for color texture classification. In this paper, we proposed new algorithm to implement the computation of the SVDRQ, and then proposed new color texture classification scheme based on SVDRQ, the Euclidean distance is applied as classifier in the proposed scheme. It is demonstrated by the experiments that our proposed scheme significantly improves the color texture classification accuracy in comparison with

several conventional texture classification approaches.”
“A role for specific human leukocyte antigen (HLA) variants in the etiology of childhood acute lymphoblastic leukemia (ALL) has been extensively studied over the last 30 years, but no unambiguous association Copanlisib price has been identified. To comprehensively study the relationship between genetic variation within the 4.5 Mbmajor histocompatibility complex genomic region and precursor B-cell (BCP) ALL risk, we analyzed 1075 observed and 8176 imputed single nucleotide polymorphisms and their related haplotypes in 824 BCP-ALL cases and 4737 controls. Using these genotypes we also imputed bothcommonand rare alleles at class I (HLA-A, HLA-B, and HLA-C) and class II (HLA-DRB1, HLA-DQA1, and HLA-DQB1) HLA loci. Overall, we found no statistically significant association between variants and BCP-ALLrisk. We conclude that major histocompatibility complex-defined variation in immune-mediated response is unlikely to be a major risk factor for BCP-ALL. (Blood.

Viral DNA concentration increased quickly and reached a plateau a

Viral DNA concentration increased quickly and reached a plateau at 60-72 h post-inoculation.

Rates of budded virus (BV) production of each GV were estimated on the basis of viral DNA concentrations by a modified Gompertz model. The slopes of the estimated BV growth curves of both XecnGV and PsunGV in M. separata larvae were equivalent to that of Mamestra brassicae nucleopolyhedrovirus (NPV) in its original host, reported in our previous study. This suggested that BV production is not a major factor in the slower killing speed of GVs in comparison to NPVs. The GV-infected larvae survived for an additional 10 days or more after reaching a maximum level of BV concentration, and kept growing without pupation, These findings also suggested that the GVs have a unique mechanism see more to regulate the growth of host larvae.”
“Purpose: To investigate the association between genotype (methyl-CpG-binding protein 2 (MECP2 gene mutation)) and epileptic seizure phenotype in Rett syndrome.\n\nMethods:

Selleckchem PARP inhibitor We used the British Isles Rett syndrome survey to identify 137 subjects with one of the nine most frequent MECP2 gene mutations and invited their parents or carers to participate in a postal questionnaire and telephone interview. The questionnaire recorded information about epileptic seizure types, non-epileptic vacant spells and treatments. Two investigators conducted telephone interviews and three epileptologists classified their epileptic seizures.\n\nResults: 89 subjects (65%) responded. The epilepsy prevalence was 67%, and 74% had non-epileptic vacant spells. The epilepsy prevalence

within specific genotypes ranged from 47% (mutation C-terminal deletion, downstream of the Transcription Repression Domain) to 100% (mutation p.R270X, c.808C>T). The prevalence of non-epileptic vacant spells within genotypes ranged from 50% (mutation p.R306C, c.916C>T) to 100% (mutation p.R106W, c.316C>T). The epileptologists differed considerably in their classification of events, particularly LY2835219 cell line of non-epileptic vacant spells.\n\nConclusions: The large majority of people with Rett syndrome have epilepsy. Most have multiple epileptic seizure types, although generalised tonic-clonic seizures are the most common. There were no significant clinical differences between genotypes. The clinical differentiation of non-epileptic vacant spells is difficult. Discordance in epileptic seizure classification between clinicians suggests that caution is needed, since the clinical history alone cannot adequately classify the epileptic seizure type in Rett syndrome. (C) 2011 British Epilepsy Association. Published by Elsevier Ltd. All rights reserved.”
“Hepatitis E virus (HEV) is a spherical, non-enveloped, single stranded RNA virus. It has five genotypes. Enterically transmitted hepatitis E virus is a major cause of outbreaks & sporadic cases of viral hepatitis in developing countries like India.

Based on size, the nodules had been grouped into less than 10mm (

Based on size, the nodules had been grouped into less than 10mm (group A) and greater than 10 mm (group B). We evaluated conventional parameters and elasticity pattern. Color-scaled elastograms were graded as to stiffness of nodules using an elasticity pattern from

I (soft) to IV (stiff). Results: Degenerating cystic thyroid nodules were similar to PTCs in conventional ultrasonographic findings, but the former frequently showed oval to round in shape (group A, 69.2% vs 18.8%, P=0.017; group B, 66.7% Navitoclax vs 7.14%, P=0.017) and punctuate hyperechoic foci (group A, 61.5% vs 0, P<0.001; group B, 50% vs 0, P<0.001). On real time ultrasound elastography, 7 of 13 degenerating cystic thyroid nodules in group A were pattern I, 5 were pattern II, 1 was pattern III. One degenerating cystic thyroid nodule in group B was pattern II, 5 were pattern III. The area under the curve for elastography was 0.98 in group A (sensitivity 92.3%, specificity 100%, P = 0.002), and 0.88 in group B (sensitivity 16.7%, specificity 100%, P = 0.014). Conclusions: As a dependable imaging technique, elastography helps increase the performance in differential diagnosis

of degenerating cystic thyroid nodule and malignancy.”
“Background: Smell sense is impaired in classic Parkinson’s disease (PD). An initial study found no change in taste threshold in non-demented PD subjects and pathological studies 3-MA mw suggest that the first relay for taste, the nucleus of the solitary tract, is spared. We wished to determine if taste is abnormal in PD and whether it is associated with smell dysfunction.\n\nMethods: Taste threshold was estimated using the Rion electrogustometer and olfaction by the University of Pennsylvania Smell Identification Test (UPSIT) in 75 non-demented PD patients and 74 controls.\n\nResults: There was a significant impairment of taste threshold and severe disorder of smell identification in the PD group.

Age, duration of symptoms, disability, and smoking had no important effect on threshold measurement and there was no correlation between taste and smell dysfunction. PF-00299804 cell line Sensitivity analysis suggested that a provisional diagnosis of PD would be confirmed if smell or taste were abnormal; conversely, the diagnosis would merit review if both modalities were normal.\n\nConclusions: Impaired taste appreciation was found in about 27% of patients with clinically defined PD. There were no important effects from age, disease severity or smell sense. Given the sparing of the first and second order taste neurones in PD, disorder of taste in PD most likely signifies involvement of the frontal operculum or orbitofrontal cortex, in keeping with advanced disease, although confounding by drug effects and changes in salivary constitution could not be excluded completely.

mirabilis respectively with different zones of inhibition

mirabilis respectively with different zones of inhibition AZD8186 nmr ranging from 18 to 35 mm gel, 15 to 18 mm for leaf pulp methanol, 20 to 32 mm green rind methanol, also 12 to 14 mm and 14 to 23 mm for leaf pulp aqueous and green rind aqueous respectively. The minimum inhibitory concentration (MIC) of the extracts against organisms ranged from 6.25 to 25 mg/ml while the minimum bactericidal concentration (MBC) was within the range of 12.5 to 50 mg/ml. The study revealed that the green rind methanol extract and gel have greater medicinal potential against B. subtilis.”
“Pseudoaneurysm of mitral-aortic

intervalvular fibrosa (PA-MAIVF) is a rare complication of native aortic valve endocarditis. BYL719 purchase This region is a relatively avascular area and prone to infection during endocarditis

and subsequent aneurysm formation. The rupture into the pericardial cavity and left atrium or aorta, systemic embolism, myocardial infarction secondary to left coronary compression, and sudden death are the reported complications. Herein, we present a 9-year-old boy who was diagnosed with bicuspid aortic valve endocarditis complicated by PA-MAIVF, cerebral embolism, and hemorrhage. PA-MAIVF was visualized by both two- and three-dimensional transthoracic echocardiography and ruptured into pericardial space causing a fatal outcome.\n\nMini-Abstract Pseudoaneurysm of mitral-aortic intervalvular fibrosa (PA-MAIVF) is a rare complication of native aortic valve endocarditis. Herein, we present a 9-year-old boy who was diagnosed with bicuspid aortic valve endocarditis complicated by PA-MAIVF. The lesion was visualized by both two- and three-dimensional transthoracic echocardiography. Cerebral embolism and hemorrhage developed at the early stage which led to delay in surgery. PA-MAIVF ruptured into pericardial space and caused a fatal outcome.”
“P>Enriched genomic libraries

in GA and GT tandem repeat motifs were generated from rubber tree (Hevea brasiliensis). Design of appropriate primer pairs in the flanking regions enables to produce amplified fragments for 310 of these sequences. The test of these genomic microsatellites on a learn more set of 10 rubber tree genotypes allows the characterization of 296 new polymorphic markers. Expected heterozygosity ranged from 0.10 to 0.93 and allele numbers from 2 to 11. Microsatellite loci with GA motifs were more abundant, longer and more polymorphic than GT motifs. Such a high variability suggests the utility of these markers for the establishment of integrated linkage maps, as well as the characterization of linkage disequilibrium in rubber tree populations.”
“Given the accumulating evidence that performance in medical school and beyond is related to personality, it is important for research to consider how personality assessment can be included as part of the process of selecting medical students.