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https://www.readbyqxmd.com/read/28338679/entomopathogenic-bacteria-use-multiple-mechanisms-for-bioactive-peptide-library-design
#1
Xiaofeng Cai, Sarah Nowak, Frank Wesche, Iris Bischoff, Marcel Kaiser, Robert Fürst, Helge B Bode
The production of natural product compound libraries has been observed in nature for different organisms such as bacteria, fungi and plants; however, little is known about the mechanisms generating such chemically diverse libraries. Here we report mechanisms leading to the biosynthesis of the chemically diverse rhabdopeptide/xenortide peptides (RXPs). They are exclusively present in entomopathogenic bacteria of the genera Photorhabdus and Xenorhabdus that live in symbiosis with nematodes delivering them to insect prey, which is killed and utilized for nutrition by both nematodes and bacteria...
April 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28338487/the-evolution-of-disease-chronic-lung-disease-of-infancy-and-pulmonary-hypertension
#2
Michael C Tracy, David N Cornfield
PURPOSE OF REVIEW: Bronchopulmonary dysplasia (BPD) or chronic lung disease of infancy BPD was originally described 50 years ago, in 1967 by Northway et al. This article possesses two fundamental objectives to provide: a brief historical perspective on BPD; and an update relative to current notions of epidemiology, pathophysiology, evaluation, and clinical management of BPD complicated by vascular disease. The review highlights areas of consensus and ongoing uncertainty. RECENT FINDINGS: The clinical cause and presentation of infants with BPD has evolved over the past several decades...
March 23, 2017: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/28336178/symbiont-acquisition-and-replacement-as-a-source-of-ecological-innovation
#3
REVIEW
Sailendharan Sudakaran, Christian Kost, Martin Kaltenpoth
Nutritional symbionts play a major role in the ecology and evolution of insects. The recent accumulation of knowledge on the identity, function, genomics, and phylogenetic relationships of insect-bacteria symbioses provides the opportunity to assess the effects of symbiont acquisitions and replacements on the shift into novel ecological niches and subsequent lineage diversification. The megadiverse insect order Hemiptera presents a particularly large diversity of symbiotic associations that has frequently undergone shifts in symbiont localization and identity, which have contributed to the exploitation of nutritionally imbalanced diets such as plant saps or vertebrate blood...
March 20, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28334357/sweetener-intake-by-rats-selectively-bred-for-differential-saccharin-intake-sucralose-stevia-and-acesulfame-potassium
#4
Nancy K Dess, Kiana Dobson, Brandon T Roberts, Clinton D Chapman
Behavioral responses to sweeteners have been used to study the evolution, mechanisms, and functions of taste. Occidental low and high saccharin consuming rats (respectively, LoS and HiS) have been selectively outbred on the basis of saccharin intake and are a valuable tool for studying variation among individuals in sweetener intake and its correlates. Relative to HiS rats, LoS rats consume smaller amounts of all nutritive and nonnutritive sweeteners tested to date, except aspartame. The lines also differ in intake of the commercial product Splenda; the roles of sucralose and saccharides in the difference are unclear...
March 15, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28330581/functional-decline-in-older-patients-with-cancer-receiving-chemotherapy-a-multicenter-prospective-study
#5
Cindy Kenis, Lore Decoster, Julie Bastin, Hannelore Bode, Katrien Van Puyvelde, Jacques De Grève, Godelieve Conings, Katleen Fagard, Johan Flamaing, Koen Milisen, Jean-Pierre Lobelle, Hans Wildiers
OBJECTIVES: This study aims to evaluate the evolution of functional status (FS) 2 to 3months after initiation of chemotherapy, to identify factors associated with functional decline during chemotherapy treatment and to investigate the prognostic value of functional decline for overall survival (OS). PATIENTS AND METHODS: Patients ≥70years with a malignant tumor were included when chemotherapy was initiated. All patients underwent a geriatric assessment (GA) including FS measured by Activities of Daily Living (ADL) and Instrumental Activities of Daily Living (IADL)...
March 15, 2017: Journal of Geriatric Oncology
https://www.readbyqxmd.com/read/28319048/amino-acid-insensitive-mtorc1-regulation-enables-nutritional-stress-resilience-in-hematopoietic-stem-cells
#6
Demetrios Kalaitzidis, Dongjun Lee, Alejo Efeyan, Youmna Kfoury, Naema Nayyar, David B Sykes, Francois E Mercier, Ani Papazian, Ninib Baryawno, Gabriel D Victora, Donna Neuberg, David M Sabatini, David T Scadden
The mTOR pathway is a critical determinant of cell persistence and growth wherein mTOR complex 1 (mTORC1) mediates a balance between growth factor stimuli and nutrient availability. Amino acids or glucose facilitates mTORC1 activation by inducing RagA GTPase recruitment of mTORC1 to the lysosomal outer surface, enabling activation of mTOR by the Ras homolog Rheb. Thereby, RagA alters mTORC1-driven growth in times of nutrient abundance or scarcity. Here, we have evaluated differential nutrient-sensing dependence through RagA and mTORC1 in hematopoietic progenitors, which dynamically drive mature cell production, and hematopoietic stem cells (HSC), which provide a quiescent cellular reserve...
March 20, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28306140/dietary-and-nutritional-change-in-india-implications-for-strategies-policies-and-interventions
#7
Bhavani Shankar, Sutapa Agrawal, Amy R Beaudreault, Laxmaiah Avula, Reynaldo Martorell, Saskia Osendarp, Dorairaj Prabhakaran, Mireille Seneclauze Mclean
Despite the global transition to overnutrition, stunting affected approximately 159 million children worldwide in 2014, while an estimated 50 million children were wasted. India is an important front in the fight against malnutrition and is grappling with the coexistence of undernutrition, overnutrition, and micronutrient deficiencies. This report summarizes discussions on trends in malnutrition in India, its evolution in the context of economic growth, intrahousehold aspects, infant and young child feeding practices, women's status, maternal nutrition, and nutrition policymaking...
March 17, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28298351/community-analysis-of-microbial-sharing-and-specialization-in-a-costa-rican-ant-plant-hemipteran-symbiosis
#8
Elizabeth G Pringle, Corrie S Moreau
Ants have long been renowned for their intimate mutualisms with trophobionts and plants and more recently appreciated for their widespread and diverse interactions with microbes. An open question in symbiosis research is the extent to which environmental influence, including the exchange of microbes between interacting macroorganisms, affects the composition and function of symbiotic microbial communities. Here we approached this question by investigating symbiosis within symbiosis. Ant-plant-hemipteran symbioses are hallmarks of tropical ecosystems that produce persistent close contact among the macroorganism partners, which then have substantial opportunity to exchange symbiotic microbes...
March 15, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28285245/a-disconnection-between-nutritional-status-in-terms-of-body-mass-index-and-phase-angle-and-psychopathology-in-anorexia-nervosa
#9
Fortunato Federico, Demartini Benedetta, Maffoni Claudia, Apicella Emanuela, Leonardi Valentina, Mendolicchio Leonardo
The aim of our study was to investigate the relationship between nutritional status (body mass index and phase angle) and psychological symptoms at admission and discharge in a residential population of anorexic patients. We also aimed to determine the evolution of the above psychological symptoms and nutrition rehabilitation from admission to discharge. Thirty-six consecutive patients were included. The evaluation was performed using the following measures at admission and discharge: body mass index, phase angle, Eating Disorders Inventory-3, Multiphasic Personality Inventory-2 and Body Uneasiness...
February 20, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28273259/-general-profile-of-the-nutrition-surplus-in-mexico-from-1990-2013-an-approach-using-the-energy-supplied-by-macronutrients-and-food-groups
#10
José Cutberto Hernández Ramírez, Judith Elena Ortega Canto
This text analyzes the evolution of the excessive food energy supply in Mexico from 1990 to 2013. For each year, the energy and macronutrient requirements of the Mexican population were estimated and contrasted with the per capita energy supply. Discrepancies between requirement and supply were analyzed as a time series. The energy surplus ranged from 700 to 800 kcal per capita per day throughout the studied period and sugar/sweeteners contributed the highest above-requirement energy supply. Lipids excess increased steadily and intensely, mainly due to lipid increases from poultry and pork...
October 2016: Salud Colectiva
https://www.readbyqxmd.com/read/28273226/parapneumonic-pleural-effusion-reality-and-strategies-in-an-amazon-university-hospital
#11
Claudia Giselle Santos Arêas, Geraldo Roger Normando Júnior, Orlando Sandoval Farias Júnior, Irna Carla DO Rosário Souza Carneiro
OBJECTIVE: to define the profile and analyze the postoperative evolution of children with parapneumonic pleural effusion (PPE), and to evaluate strategies used in the presence of diagnostic and therapeutic limitations, emphasizing the open thoracic drainage (OTD) . METHODS: we conducted a cross-sectional, prospective, analytical study in which we followed children admitted in an Amazon university hospital with surgically addressed PPE, from October 2010 to October 2011...
December 2016: Revista do Colégio Brasileiro de Cirurgiões
https://www.readbyqxmd.com/read/28255977/remission-of-type-2-diabetes-mellitus-after-bariatric-surgery-comparison-between-procedures
#12
María L Fernández-Soto, Ana Martín-Leyva, Amalia González-Jiménez, Jesús García-Rubio, Antonio Cózar-Ibáñez, Francisco J Zamora-Camacho, María S Leyva-Martínez, Jose A Jiménez-Ríos, Fernándo Escobar-Jiménez
INTRODUCTION: We aimed to assess the mid-term type 2 diabetes mellitus recovery patterns in morbidly obese patients by comparing some relevant physiological parameters of patients of bariatric surgery between two types of surgical procedures: mixed (roux-en-Y gastric bypass and biliopancreatic diversion) and restrictive (sleeve gastrectomy). MATERIAL AND METHODS: This is a prospective and observational study of co-morbid, type 2 diabetes mellitus evolution in 49 morbidly obese patients: 37 underwent mixed surgery procedures and 12 a restrictive surgery procedure...
2017: Endokrynologia Polska
https://www.readbyqxmd.com/read/28237561/evolution-of-endoscopic-treatment-of-sleeve-gastrectomy-leaks-from-partially-covered-to-long-fully-covered-stents
#13
Fabio Garofalo, Maxime Noreau-Nguyen, Ronald Denis, Henri Atlas, Pierre Garneau, Radu Pescarus
BACKGROUND: Laparoscopic sleeve gastrectomy (SG) has become a widely accepted option in the treatment of morbid obesity. Gastric leaks after SG occur in .9%-2.2% of the patients, mostly at the gastroesophageal junction. The current treatment algorithm includes drainage, antibiotics, nutritional support, and endoluminal control. OBJECTIVES: Our hypothesis is that long, fully covered stents represent a safe, effective solution for SG leaks. SETTING: University hospital...
December 26, 2016: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/28231417/genetic-and-genomic-evidence-of-niche-partitioning-and-adaptive-radiation-in-mountain-pine-beetle-fungal-symbionts
#14
Dario I Ojeda Alayon, Clement K M Tsui, Nicolas Feau, Arnaud Capron, Braham Dhillon, Yiyuan Zhang, Sepideh Massoumi Alamouti, Celia K Boone, Allan L Carroll, Janice E K Cooke, Amanda D Roe, Felix A H Sperling, Richard C Hamelin
Bark beetles form multipartite symbiotic associations with blue stain fungi (Ophiostomatales, Ascomycota). These symbionts play an important role during the beetle's life cycle by providing nutritional supplementation, overcoming tree defenses and modifying host tissues to favor brood development. The maintenance of stable multipartite symbioses with seemingly less competitive symbionts in similar habitats is of fundamental interest to ecology and evolution. We tested the hypothesis that the coexistence of three fungal species associated with the mountain pine beetle is the result of niche partitioning and adaptive radiation using SNP genotyping coupled with genotype-environment association analysis and phenotypic characterization of growth rate under different temperatures...
February 23, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28231180/evolution-of-the-maillard-reaction-in-glutamine-or-arginine-dextrinomaltose-model-systems
#15
Silvia Pastoriza, José Ángel Rufián-Henares, Belén García-Villanova, Eduardo Guerra-Hernández
Enteral formulas are foods designed for medical uses to feed patients who are unable to eat normally. They are prepared by mixing proteins, amino acids, carbohydrates and fats and submitted to sterilization. During thermal treatment, the Maillard reaction takes place through the reaction of animo acids with reducing sugars. Thus, although glutamine and arginine are usually added to improve the nutritional value of enteral formulas, their final concentration may vary. Thus, in the present paper the early, intermediate, and advanced states of the Maillard reaction were studied in model systems by measuring loss of free amino acids through the decrease of fluorescence intensity with o-phtaldialdehyde (OPA), 5-Hydroximethylfurfural (HMF), furfural, glucosylisomaltol, fluorescence, and absorbance at 420 nm...
December 7, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28230293/influence-of-complex-childhood-diseases-on-variation-in-growth-and-skeletal-development
#16
REVIEW
Babette S Zemel
The study of human growth and skeletal development by human biologists is framed by the larger theoretical concerns regarding the underpinnings of population variation and human evolution. This unique perspective is directly relevant to the assessment of child health and well-being at the individual and group level, as well as the construction of growth charts. Environmental, behavioral (nutrition and physical activity), and disease-related factors can prevent attainment of full genetic potential for growth...
February 23, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28220606/lamarck-rises-from-his-grave-parental-environment-induced-epigenetic-inheritance-in-model-organisms-and-humans
#17
Yan Wang, Huijie Liu, Zhongsheng Sun
Organisms can change their physiological/behavioural traits to adapt and survive in changed environments. However, whether these acquired traits can be inherited across generations through non-genetic alterations has been a topic of debate for over a century. Emerging evidence indicates that both ancestral and parental experiences, including nutrition, environmental toxins, nurturing behaviour, and social stress, can have powerful effects on the physiological, metabolic and cellular functions in an organism...
February 20, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/28216663/the-importance-of-pollen-chemistry-in-evolutionary-host-shifts-of-bees
#18
Maryse Vanderplanck, Nicolas J Vereecken, Laurent Grumiau, Fabiana Esposito, Georges Lognay, Ruddy Wattiez, Denis Michez
Although bee-plant associations are generally maintained through speciation processes, host shifts have occurred during evolution. Understanding shifts between both phylogenetically and morphologically unrelated plants (i.e., host-saltation) is especially important since they could have been key processes in the origin and radiation of bees. Probably far from being a random process, such host-saltation might be driven by hidden constraints associated with plant traits. We selected two clades of oligolectic bees (i...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28173637/specificity-of-fungal-associations-of-pyroleae-and-monotropa-hypopitys-during-germination-and-seedling-development
#19
V A Johansson, M Bahram, L Tedersoo, U Kõljalg, O Eriksson
Mycoheterotrophic plants obtain organic carbon from associated mycorrhizal fungi, fully or partially. Angiosperms with this form of nutrition possess exceptionally small 'dust seeds' which after germination develop 'seedlings' that remain subterranean for several years, fully dependent on fungi for supply of carbon. Mycoheterotrophs which as adults have photosynthesis thus develop from full to partial mycoheterotrophy, or autotrophy, during ontogeny. Mycoheterotrophic plants may represent a gradient of variation in a parasitism-mutualism continuum, both among and within species...
February 7, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28168721/yolk-sac-development-in-lizards-lacertilia-scincidae-new-perspectives-on-the-egg-of-amniotes
#20
James R Stewart, Michael B Thompson
Embryos of oviparous reptiles develop on the surface of a large mass of yolk, which they metabolize to become relatively large hatchlings. Access to the yolk is provided by tissues growing outward from the embryo to cover the surface of the yolk. A key feature of yolk sac development is a dedicated blood vascular system to communicate with the embryo. The best known model for yolk sac development and function of oviparous amniotes is based on numerous studies of birds, primarily domestic chickens. In this model, the vascular yolk sac forms the perimeter of the large yolk mass and is lined by a specialized epithelium, which takes up, processes and transports yolk nutrients to the yolk sac blood vessels...
February 6, 2017: Journal of Morphology
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