bluuebunny/crossref_metadata_2025_split huggingface dataset:
De novo assembly of Euphorbia fischeriana root transcriptome identifies prostratin pathway related genes
Authors: Barrero Roberto A , Chapman Brett , Yang Yanfang , Moolhuijzen Paula , Keeble-Gagnère Gabriel , Zhang Nan , Tang Qi , Bellgard Matthew I , Qiu Deyou 
Published: December 2011

AbstractBackgroundEuphorbia fischerianais an important medicinal plant found in Northeast China. The plant roots contain many medicinal compounds including 12-deoxyphorbol-13-acetate, commonly known as prostratin that is a phorbol ester from the tigliane diterpene series. Prostratin is a protein kinase C activator and is effective in the treatment of Human Immunodeficiency Virus (HIV) by acting as a latent HIV activator. Latent HIV is currently the biggest limitation for viral eradication. The aim of this study was to sequence, assemble and annotate theE. fischerianatranscriptome to better understand the potential biochemical pathways leading to the synthesis of prostratin and other related diterpene compounds.ResultsIn this study we conducted a high throughput RNA-seq approach to sequence the root transcriptome ofE. fischeriana. We assembled 18,180 transcripts, of these the majority encoded protein-coding genes and only 17 transcripts corresponded to known RNA genes. Interestingly, we identified 5,956 protein-coding transcripts with high similarity (> = 75%) toRicinus communis, a close relative toE. fischeriana. We also evaluated the conservation ofE. fischerianagenes against EST datasets from the Euphorbeacea family, which includedR. communis,Hevea brasiliensisandEuphorbia esula. We identified a core set of 1,145 gene clusters conserved in all four species and 1,487E. fischerianaparalogous genes. Furthermore, we screenedE. fischerianatranscripts against an in-house reference database for genes implicated in the biosynthesis of upstream precursors to prostratin. This identified 24 and 9 candidate transcripts involved in the terpenoid and diterpenoid biosyntehsis pathways, respectively. The majority of the candidate genes in these pathways presented relatively low expression levels except for 1-hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate synthase (HDS) and isopentenyl diphosphate/dimethylallyl diphosphate synthase (IDS), which are required for multiple downstream pathways including synthesis of casbene, a proposed precursor to prostratin.ConclusionThe resources generated in this study provide new insights into the upstream pathways to the synthesis of prostratin and will likely facilitate functional studies aiming to produce larger quantities of this compound for HIV research and/or treatment of patients.
The insertion/deletion (I/D) polymorphism in the Angiotensin-converting enzyme gene and cancer risk: a meta-analysis
Authors: Zhang Yonggang , He Jie , Deng Yao , Zhang Jie , Li Xiaobo , Xiang Zhangpeng , Huang Honglang , Tian Can , Huang Jin , Fan Hong 
Published: December 2011

Abstract

Background
The insertion/deletion (I/D) polymorphism in the Angiotensin-converting enzyme (ACE) gene has been implicated in susceptibility to cancer, but a large number of studies have reported inconclusive results. The aim of this study is to assess the association between the I/D polymorphism in the ACE gene and cancer risk by meta-analysis.

Methods
A search was performed in Pubmed database, Embase database, Chinese Biomedical (CBM) database, China National Knowledge Infrastructure (CNKI) database and Weipu database, covering all studies until August 31, 2010. Statistical analysis was performed by using Revman4.2 and STATA 10.0.

Results
A total of 25 case-control studies comprising 3914 cancer patients and 11391 controls were identified. No significant association was found between the I/D polymorphism and over all cancer risks (OR = 0.88, 95%CI = 0.73-1.06, P = 0.17 for DD+DI vs. II). In the subgroup analysis by ethnicity, no significant association was found among Asians and Europeans for the comparison of DD+DI vs. II. In the subgroup analysis by cancer types, no significant associations were found among lung cancer, breast cancer, prostate cancer, colorectal cancer, gastric cancer for the comparison of DD+DI vs. II. Results from other comparative genetic models also indicated the lack of associations between this polymorphism and cancer risks.

Conclusions
This meta-analysis suggested that the ACE D/I polymorphism might not contribute to the risk of cancer.
Factors associated with caregiver burden in a child and adolescent psychiatric facility in Lagos, Nigeria: a descriptive cross sectional study
Authors: Dada Mobolaji U , Okewole Niran O , Ogun Oluyemi C , Bello-Mojeed Mashudat A 
Published: December 2011

Abstract

Background
Definitions of burden of care stress the effect of the patient's mental illness on the family. There are generally very few studies in this environment on caregiver burden in child/adolescent mental ill-health. This study aimed to identify patient and caregiver characteristics that are associated with caregiver burden.

Method
Caregivers of patients attending the Child and Adolescent Clinic of the Neuropsychiatric Hospital, Yaba, Lagos [n = 155] were consecutively recruited over a one-month period. The caregivers were administered a sociodemographic questionnaire, the General Health Questionnaire, Zarit Burden Interview, and the Columbia Impairment Scale. Scoring on the Children's Global Assessment Scale was done by clinicians.

Results
Most caregivers observed in this study were females (80.5%), with mothers of the patients accounting for 78% of all the caregivers. A higher percentage of the patients were males (52.8%). Moderate to severe/severe burden was recorded among 25.2% of caregivers. Factors associated with caregiver burden were patient's level of functioning [r = 0.489, p < 0.001], psychiatric morbidity in the caregiver [r = 0.709, p < 0.001], level of impairment as assessed by the caregiver [r = 0.545, p < 0.001], and child's level of education [t = 3.274, p = 0.001]. Each one independently predicted caregiver burden.

Conclusion
The study reveals a high level of burden among the caregivers of children and adolescents with mental health problems.
Sexual Knowledge, attitudes and behaviors among unmarried migrant female workers in China: a comparative analysis
Authors: Tang Jie , Gao Xiaohui , Yu Yizhen , Ahmed Niman Isse , Zhu Huiping , Wang Jiaji , Du Yukai 
Published: December 2011

Abstract

Background
In recent years, many studies have focused on adolescent's sex-related issues in China. However, there have been few studies of unmarried migrant females' sexual knowledge, attitudes and behaviors, which is important for sexual health education and promotion.

Methods
A sample of 5156 unmarried migrant female workers was selected from three manufacturing factories, two located in Shenzhen and one in Guangzhou, China. Demographic data, sexual knowledge, attitudes and behaviors were assessed by self-administered questionnaires. Multivariate logistic regression analysis was conducted to examine the factors associated with premarital sexual intercourse.

Results
The average age of the unmarried female workers included in the sample was 20.2 years, and majority of them showed a low level of sex-related knowledge. Females from the west of China demonstrated a significant lower level of sex-related knowledge than those from the eastern or central provinces (p < 0.05). Approximately 13% of participants held a favorable attitude towards premarital sexual intercourse, and youths from the east/central were more likely to have favorable attitudes compared with those from the west (p < 0.05). About 17.0% of the unmarried female workers reported having engaged in premarital sexual intercourse, and females from the east/central were more likely to have experienced premarital sexual intercourse than those from the west (p < 0.05). Multivariate analysis revealed that age, education, current residential type, dating, sexual knowledge, attitudes, and pattern of communication were significantly associated with premarital sexual intercourse.

Conclusion
The unmarried migrant female workers lack sexual knowledge and a substantial proportion of them are engaged in premarital sexual behaviors. Interventions aimed at improving their sexual knowledge and related skills are needed.
A high-performance quantum dot superluminescent diode with a two-section structure
Authors: Li Xinkun , Jin Peng , An Qi , Wang Zuocai , Lv Xueqin , Wei Heng , Wu Jian , Wu Ju , Wang Zhanguo 
Published: December 2011

AbstractBased on InAs/GaAs quantum dots [QDs], a high-power and broadband superluminescent diode [SLD] is achieved by monolithically integrating a conventional SLD with a semiconductor optical amplifier. The two-section QD-SLD device exhibits a high output power above 500 mW with a broad emission spectrum of 86 nm. By properly controlling the current injection in the two sections of the QD-SLD device, the output power of the SLD can be tuned over a wide range from 200 to 500 mW while preserving a broad emission spectrum based on the balance between the ground state emission and the first excited state emission of QDs. The gain process of the two-section QD-SLD with different pumping levels in the two sections is investigated.
Temporal pattern of expression and colocalization of microglia/macrophage phenotype markers following brain ischemic injury in mice
Authors: Perego Carlo , Fumagalli Stefano , De Simoni Maria-Grazia 
Published: December 2011

AbstractBackgroundEmerging evidence indicates that, similarly to what happens for peripheral macrophages, microglia can express different phenotypes depending on microenvironmental signals. In spite of the large literature on inflammation after ischemia, information on M/M phenotype marker expression, their colocalization and temporal evolution in the injured brain is lacking. The present study investigates the presence of microglia/macrophage phenotype markers, their temporal expression, whether they are concomitantly expressed by the same subpopulation, or they are expressed at distinct phases or locations in relation to the ischemic lesion.MethodsVolume of ischemic lesion, neuronal counts and TUNEL staining were assessed in C57Bl/6 mice at 6-12-24-48 h and 7d after permanent occlusion of the middle cerebral artery. At the same time points, the expression, distribution in the lesioned area, association with a definite morphology and coexpression of the microglia/macrophage markers CD11b, CD45, CD68, Ym1, CD206 were assessed by immunostaining and confocal microscopy.ResultsThe results show that: 1) the ischemic lesion induces the expression of selected microglia/macrophage markers that develop over time, each with a specific pattern; 2) each marker has a given localization in the lesioned area with no apparent changes during time, with the exception of CD68 that is confined in the border zone of the lesion at early times but it greatly increases and invades the ischemic core at 7d; 3) while CD68 is expressed in both ramified and globular CD11b cells, Ym1 and CD206 are exclusively expressed by globular CD11b cells.ConclusionsThese data show that the ischemic lesion is accompanied by activation of specific microglia/macrophage phenotype that presents distinctive spatial and temporal features. These different states of microglia/macrophages reflect the complexity of these cells and their ability to differentiate towards a multitude of phenotypes depending on the surrounding micro-environmental signals that can change over time. The data presented in this study provide a basis for understanding this complex response and for developing strategies resulting in promotion of a protective inflammatory phenotype.
Type of diet modulates the metabolic response to sleep deprivation in rats
Authors: Martins Paulo JF , Fernandes Leandro , de Oliveira Allan C , Tufik Sergio , D'Almeida Vânia 
Published: December 2011

Abstract

Background
Evidence suggests that sleep loss is associated with an increased risk of obesity and diabetes; however, animal models have failed to produce weight gain under sleep deprivation (SD). Previous studies have suggested that this discrepancy could be due to more extreme SD conditions in experimental animals, their higher resting metabolic rate than that of humans, and the decreased opportunity for animals to ingest high-calorie foods. Thus, our objective was to determine whether diets with different textures/compositions could modify feeding behavior and affect the metabolic repercussions in SD in rats.

Methods
Three groups of male rats were used: one was designated as control, one was sleep deprived for 96 h by the platform technique (SD-96h) and one was SD-96h followed by a 24-h recovery (rebound). In the first experiment, the animals were fed chow pellets (CPs); in the second, they received high-fat diet and in the third, they were fed a liquid diet (LD).

Results
We observed that SD induces energy deficits that were related to changes in feeding behavior and affected by the type of diet consumed. Regardless of the diet consumed, SD consistently increased animals' glucagon levels and decreased their leptin and triacylglycerol levels and liver glycogen stores. However, such changes were mostly avoided in the rats on the liquid diet. SD induces a wide range of metabolic and hormonal changes that are strongly linked to the severity of weight loss.

Conclusions
The LD, but not the CP or high-fat diets, favored energy intake, consequently lessening the energy deficit induced by SD.
Transcriptome analysis of anti-fatty liver action by Campari tomato using a zebrafish diet-induced obesity model
Authors: Tainaka Toshiyuki , Shimada Yasuhito , Kuroyanagi Junya , Zang Liqing , Oka Takehiko , Nishimura Yuhei , Nishimura Norihiro , Tanaka Toshio 
Published: December 2011

Abstract

Background
High dietary intake of vegetable products is beneficial against obesity and its related diseases such as dyslipidemia, nonalcoholic fatty liver disease, and cancer. We previously developed a diet-induced obesity model of zebrafish (DIO-zebrafish) that develops visceral adiposity, dyslipidemia, and liver steatosis. Zebrafish is a polyphagous animal; thus we hypothesized that DIO-zebrafish could be used for transcriptome analysis of anti-obesity effects of vegetables.

Results
Each vegetable exhibited different effects against obesity. We focused on "Campari" tomato, which suppressed increase of body weight, plasma TG, and lipid droplets in livers of DIO-zebrafish. Campari tomato decreased srebf1 mRNA by increase of foxo1 gene expression, which may depend on high contents of β-carotene in this strain.

Conclusions
Campari tomato ameliorates diet-induced obesity, especially dyslipidemia and liver steatosis via downregulation of gene expression related to lipogenesis. DIO-zebrafish can discriminate the anti-obesity effects of different strains of vegetables, and will become a powerful tool to assess outcomes and find novel mechanisms of anti-obesity effects of natural products.
Intimal aortic sarcoma mimicking ruptured thoracoabdominal type IV aneurysm. a rare case report and review of the literature
Authors: Dedeilias Panagiotis , Koletsis Efstratios , Nenekidis Ioannis , Chatziioannou Achilles , Tsipas Pantelis , Dimaka Konstantina , Anagnostakou Vania , Apostolakis Efstratios 
Published: December 2011

Abstract
Primary intimal aortic sarcoma represents a very rare and highly lethal medical entity. Diagnosis is made either by embolic events caused by the tumor or by surrounding tissue symptoms such as pain. Herein we report an extremely rare case of a 51-year-old man previously operated for ascending aortic aneurysm, who presented with clinical and radiological findings suggestive of a ruptured thoracoabdominal type IV aneurysm. The patient underwent radical resection of the aorta and surrounding tissue with placement of a composite 4-branched graft. The diagnosis was made by frozen section and regular histopathologic examination of the specimen and the patient received adjuvant chemotherapy. Nine months after surgery the patient is still alive and has no signs of recurrence. We review the literature and discuss the option of postoperative chemotherapy.
Noise filtering tradeoffs in spatial gradient sensing and cell polarization response
Authors: Chou Ching-Shan , Bardwell Lee , Nie Qing , Yi Tau-Mu 
Published: December 2011

Abstract

Background
Cells sense chemical spatial gradients and respond by polarizing internal components. This process can be disrupted by gradient noise caused by fluctuations in chemical concentration.

Results
We investigated how external gradient noise affects spatial sensing and response focusing on noise-filtering and the resultant tradeoffs. First, using a coarse-grained mathematical model of gradient-sensing and cell polarity, we characterized three negative consequences of noise: Inhibition of the extent of polarization, degradation of directional accuracy, and production of a noisy output polarization. Next, we explored filtering strategies and discovered that a combination of positive feedback, multiple signaling stages, and time-averaging produced good results. There was an important tradeoff, however, because filtering resulted in slower polarization. Simulations demonstrated that a two-stage filter-amplifier resulted in a balanced outcome. Then, we analyzed the effect of noise on a mechanistic model of yeast cell polarization in response to gradients of mating pheromone. This analysis showed that yeast cells likely also combine the above three filtering mechanisms into a filter-amplifier structure to achieve impressive spatial-noise tolerance, but with the consequence of a slow response time. Further investigation of the amplifier architecture revealed two positive feedback loops, a fast inner and a slow outer, both of which contributed to noise-tolerant polarization. This model also made specific predictions about how orientation performance depended upon the ratio between the gradient slope (signal) and the noise variance. To test these predictions, we performed microfluidics experiments measuring the ability of yeast cells to orient to shallow gradients of mating pheromone. The results of these experiments agreed well with the modeling predictions, demonstrating that yeast cells can sense gradients shallower than 0.1% μm-1, approximately a single receptor-ligand molecule difference between front and back, on par with motile eukaryotic cells.

Conclusions
Spatial noise impedes the extent, accuracy, and smoothness of cell polarization. A combined filtering strategy implemented by a filter-amplifier architecture with slow dynamics was effective. Modeling and experimental data suggest that yeast cells employ these elaborate mechanisms to filter gradient noise resulting in a slow but relatively accurate polarization response.
First trimester myomectomy as an alternative to termination of pregnancy in a woman with a symptomatic uterine leiomyoma: a case report
Authors: Leach Kara , Khatain Larissa , Tocce Kristina 
Published: December 2011

Abstract

Introduction
Performing a myomectomy during pregnancy is extremely rare due to the risk of pregnancy loss, hemorrhage and hysterectomy. Favorable outcomes have been demonstrated with select second trimester gravid myomectomies. Literature documenting first trimester surgical management of myomas during pregnancy is scant. Patients with symptomatic myomas failing conservative management in the first trimester may be counseled to abort the pregnancy and then undergo myomectomy. Reports focusing on myomectomy in the first trimester are needed to permit more thorough options counseling for patients failing conservative management in the first trimester.

Case presentation
A 30-year-old Caucasian primagravid (G1P0) was referred for termination of her pregnancy at 10 weeks due to a 14 cm myoma causing severe pain, constipation and urine retention. Her referring physician planned an interval myomectomy following the abortion. Instead, our patient underwent myomectomy at 11 weeks. Two leiomyomas were successfully removed; she delivered a healthy infant at term.

Conclusion
Patients in the first trimester should not be counseled that termination followed by myomectomy is the best option for symptomatic myomas, failing conservative treatment. Management should be individualized after taking into account the patient's symptoms, gestational age and the location of the myomas in relation to the placenta. Any field providing women's health services will be impacted by the ability to offer more thorough options counseling for women with refractory myomas in the first trimester.
High level expression of Acidothermus cellulolyticusβ-1, 4-endoglucanase in transgenic rice enhances the hydrolysis of its straw by cultured cow gastric fluid
Authors: Chou Hong Li , Dai Ziyu , Hsieh Chia Wen , Ku Maurice SB 
Published: December 2011

Abstract

Background
Large-scale production of effective cellulose hydrolytic enzymes is the key to the bioconversion of agricultural residues to ethanol. The goal of this study was to develop a rice plant as a bioreactor for the large-scale production of cellulose hydrolytic enzymes via genetic transformation, and to simultaneously improve rice straw as an efficient biomass feedstock for conversion of cellulose to glucose.

Results
In this study, the cellulose hydrolytic enzyme β-1, 4-endoglucanase (E1) gene, from the thermophilic bacterium Acidothermus cellulolyticus, was overexpressed in rice through Agrobacterium-mediated transformation. The expression of the bacterial E1 gene in rice was driven by the constitutive Mac promoter, a hybrid promoter of Ti plasmid mannopine synthetase promoter and cauliflower mosaic virus 35S promoter enhancer, with the signal peptide of tobacco pathogenesis-related protein for targeting the E1 protein to the apoplastic compartment for storage. A total of 52 transgenic rice plants from six independent lines expressing the bacterial E1 enzyme were obtained that expressed the gene at high levels without severely impairing plant growth and development. However, some transgenic plants exhibited a shorter stature and flowered earlier than the wild type plants. The E1 specific activities in the leaves of the highest expressing transgenic rice lines were about 20-fold higher than those of various transgenic plants obtained in previous studies and the protein amounts accounted for up to 6.1% of the total leaf soluble protein. A zymogram and temperature-dependent activity analyses demonstrated the thermostability of the E1 enzyme and its substrate specificity against cellulose, and a simple heat treatment can be used to purify the protein. In addition, hydrolysis of transgenic rice straw with cultured cow gastric fluid for one hour at 39°C and another hour at 81°C yielded 43% more reducing sugars than wild type rice straw.

Conclusion
Taken together, these data suggest that transgenic rice can effectively serve as a bioreactor for the large-scale production of active, thermostable cellulose hydrolytic enzymes. As a feedstock, direct expression of large amount of cellulases in transgenic rice may also facilitate saccharification of cellulose in rice straw and significantly reduce the costs for hydrolytic enzymes.