Abstract:
:X-Ray diffraction is the only method currently available for the determination of the detailed three-dimensional structure of macromolecules. In this article, the principles behind the use of X-ray crystallography in the study of protein structure are presented. The results obtained in its application to several enzymes are discussed, as well as the limitations of the method.
journal_name
Biol Resjournal_title
Biological researchauthors
Cid Hsubject
Has Abstractpub_date
1996-01-01 00:00:00pages
101-26issue
1eissn
0716-9760issn
0717-6287journal_volume
29pub_type
杂志文章,评审abstract:BACKGROUND:Impaired wound healing is a complication of diabetes and a serious problem in clinical practice. We previously found that whey protein (WP) was able to regulate wound healing normally in streptozotocin (STZ)-diabetic models. This subsequent study was designed to assess the effect of WP on heat shock protein-...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-015-0044-5
更新日期:2015-10-01 00:00:00
abstract::Hearing loss is the most common inherited sensorial deficiency in humans; about 1 in 1000 children suffer from severe or profound hearing loss at birth. Mutations in the GJB2 gene are the most common cause of prelingual, non-syndromic autosomal recessive deafness in many populations; the c.35delG mutation is the most ...
journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/S0716-97602013000300003
更新日期:2013-01-01 00:00:00
abstract::Guanine nucleotide binding proteins (GTP-binding proteins) function as transducers of signals in different cellular processes. We have identified several GTP-binding proteins in Trypanosoma cruzi by Western blot analyses. Six polypeptide bands, p20, p25, p28, p31, p37 and p38, were specifically detected in epimastigot...
journal_title:Biological research
pub_type: 杂志文章
doi:
更新日期:1993-01-01 00:00:00
abstract::Allium cepa L. meristems were used as a plant model to study the p53-independent control of S and G2 phases by checkpoint pathways, in eukaryotic cells. Checkpoint blocks were induced at early and mid S by hydroxyurea. After their spontaneous override, cells became accumulated in G2-prophase, giving rise later on to a...
journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602003000300009
更新日期:2003-01-01 00:00:00
abstract::Object recognition memory allows discrimination between novel and familiar objects. This kind of memory consists of two components: recollection, which depends on the hippocampus, and familiarity, which depends on the perirhinal cortex (Pcx). The importance of brain-derived neurotrophic factor (BDNF) for recognition m...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602010000200013
更新日期:2010-01-01 00:00:00
abstract::Shigella flexneri causes bacillary dysentery in humans. Essential to the establishment of the disease is the invasion of the colonic epithelial cells. Here we investigated the role of the lipopolysaccharide (LPS) O antigen in the ability of S. flexneri to adhere to and invade polarized Caco-2 cells. The S. flexneri 2a...
journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/S0716-97602012000100003
更新日期:2012-01-01 00:00:00
abstract:BACKGROUND:miR-214 was demonstrated to be upregulated in models of renal disease and promoted fibrosis in renal injury independent of TGF-β signaling in vivo. However, the detailed role of miR-214 in acute kidney injury (AKI) and its underlying mechanism are still largely unknown. METHODS:In this study, an I/R-induced...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-018-0179-2
更新日期:2018-09-04 00:00:00
abstract:BACKGROUND:Left ventricular diastolic dysfunction is one of the main characteristics of heart failure patients with a preserved left ventricular ejection fraction. As bilirubin is regarded as an important endogenous antioxidant molecule, serum total bilirubin levels were compared between heart failure patients with a p...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/0717-6287-47-7
更新日期:2014-03-26 00:00:00
abstract::The development of plant transformation in the mid-1980s and of many new tools for cell biology, molecular genetics, and biochemistry has resulted in enormous progress in plant biology in the past decade. With the completion of the genome sequence of Arabidopsis thaliana just around the corner, we can expect even fast...
journal_title:Biological research
pub_type: 杂志文章,评审
doi:
更新日期:1999-01-01 00:00:00
abstract::7-ketocholesterol (7-KC) differs from cholesterol by a functional ketone group at C7. It is an oxygenated cholesterol derivative (oxysterol), commonly present in oxidized low-density lipoprotein (LDL). Oxysterols are generated and participate in several physiologic and pathophysiologic processes. For instance, the cyt...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602010000400008
更新日期:2010-01-01 00:00:00
abstract::Many motor skills, once acquired, are stored over a long time period, probably sustained by permanent neuronal changes. Thus, in this paper we have investigated with quantitative stereology the generation and persistence of neuronal density changes in primary motor cortex (MI) following motor skill learning (skilled r...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602008000400005
更新日期:2008-01-01 00:00:00
abstract:BACKGROUND:The Hawthorn (Crateagus sp.) mostly occurs around the temperate region of the world with a high number of species, producing a fruit with numerous beneficial effects for human health. The aim of the study was to determine organic acid and sugar contents in the fruit of a number of hawthorn species grown in E...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/0717-6287-47-21
更新日期:2014-05-30 00:00:00
abstract::The aim of this study was to compare the effects of Mediterranean-type diet (MD), high-fat diet (HFD), and red wine supplementation on plasma concentration of emergent haemostatic cardiovascular risk factors (HCVRF) and on variables of primary haemostasis (bleeding time, plasma von Willebrand factor and platelet aggre...
journal_title:Biological research
pub_type: 临床试验,杂志文章
doi:10.4067/s0716-97602004000200007
更新日期:2004-01-01 00:00:00
abstract::The regeneration of natural tetraploid T. pratense, originated from Erzurum-Turkey, is reported in this study. This plant has low seed setting and hard seed problems due to polyploidy. Hypocotyl, cotyledon, apical meristems, epicotyl and young primary leaves were inoculated on MS and PC-L2 media containing different c...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602008000100004
更新日期:2008-01-01 00:00:00
abstract:BACKGROUND:Recently, a continuous growth of interest has been observed in antimicrobial peptides (AMPs) in the light of an alarming increase in resistance of bacteria and fungi against antibiotics. AMPs are used as biomarkers in diagnosis and monitoring of oral cavity pathologies. Therefore, the determination of specif...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-015-0050-7
更新日期:2015-10-31 00:00:00
abstract::Cyanobacteria display a large diversity of cellular forms ranging from unicellular to complex multicellular filaments or aggregates. Species in the group present a wide range of metabolic characteristics including the fixation of atmospheric nitrogen, resistance to extreme environments, production of hydrogen, seconda...
journal_title:Biological research
pub_type: 杂志文章,评审
doi:10.4067/S0716-97602013000400009
更新日期:2013-01-01 00:00:00
abstract::The hypothesis that the vacation-study-expectancy scholar regime produces most of the monthly rhythm of the age at menarche (AaM) was tested. Studies on monthly menarche incidence (MI) refuted climatic factors as a main factor in this rhythm, and indicated that the main factor of this rhythm is the succession of expec...
journal_title:Biological research
pub_type: 杂志文章,评审
doi:10.4067/S0716-97602013000100003
更新日期:2013-01-01 00:00:00
abstract:BACKGROUND:IcarisideII (ICAII) could promote the differentiation of adipose tissue-derived stem cells (ADSCs) to Schwann cells (SCs), leading to improvement of erectile function (EF) and providing a realistic therapeutic option for the treatment of erectile dysfunction (ED). However, the underlying molecular mechanisms...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-019-0262-3
更新日期:2019-10-03 00:00:00
abstract:BACKGROUND:Asthma is a complex disease influenced by multiple genetic and environmental factors. While Madeira has the highest prevalence of asthma in Portugal (14.6%), the effect of both genetic and environmental factors in this population has never been assessed. We categorized 98 asthma patients according to the Glo...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/0717-6287-47-40
更新日期:2014-09-04 00:00:00
abstract::In mammals, neurogenesis continues during adulthood in restricted places of the nervous system, namely the subventricular zone, the dentate gyms and the olfactory epithelium. A dual role of the second messenger nitric oxide has been reported in such places, either promoting or inhibiting proliferation of neuronal prec...
journal_title:Biological research
pub_type: 杂志文章,评审
doi:10.4067/s0716-97602006000500002
更新日期:2006-01-01 00:00:00
abstract::Extracts prepared from seeds of Manilkara zapota, Anona squamosa, and Tamarindus indica were screened for their antibacterial activity by disc diffusion and broth dilution methods. Acetone and methanol extracts of T. indica seeds were found active against both gram-positive and gram-negative organisms. MIC values of p...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602010000200003
更新日期:2010-01-01 00:00:00
abstract::The radiobiocomplexes labeled with technetium-99m (Tc-99m) have been widely used in nuclear medicine in single photon emission computed tomography and in basic research. The aim of this study was to assess the influence of a Nectandra membranacea extract on the bioavailability of the sodium pertechnetate (Na(99m)TcO(4...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602007000200004
更新日期:2007-01-01 00:00:00
abstract:BACKGROUND:Conjunctival filtering bleb scar formation is the main reason for the failure of glaucoma filtration surgery. Cytoglobin (Cygb) has been reported to play an important role in extracellular matrix (ECM) remodeling, fibrosis and tissue damage repairing. This study aimed to investigate the role of Cygb in anti-...
journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-019-0229-4
更新日期:2019-04-16 00:00:00
abstract::The objective of this study was to test the hypothesis that root of maguey (Agave salmiana Otto ex Salm-Dyck) seedlings reacts during the first 24 h to low substrate water potential (PsiW), by anatomical modifications. Three-4 cm root length seedlings were planted in vermiculite for 24 h at PsiW between -0.03 and -2.3...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602009000200013
更新日期:2009-01-01 00:00:00
abstract::A peptide from hindguts of the Triatoma infestans, the hematophagous Chagas' insect vector, activates adenylyl cyclase activity in Trypanosoma cruzi epimastigote membranes and stimulates the in vitro differentiation of epimastigotes (proliferative and non-infectious forms) to metacyclic trypomastigotes (non-proliferat...
journal_title:Biological research
pub_type: 杂志文章
doi:
更新日期:1993-01-01 00:00:00
abstract::Oxidative stress occurs early in the progression of Alzheimer disease, significantly before the development of the pathologic hallmarks, neurofibrillary tangles and senile plaques. In the first stage of development of the disease, amyloid-beta deposition and hyperphosphorylated tau function as compensatory responses a...
journal_title:Biological research
pub_type: 杂志文章,评审
doi:10.4067/s0716-97602006000100002
更新日期:2006-01-01 00:00:00
abstract::In the last few decades, several works on event related potentials (ERPs hereafter) during sleep have been reported. In spite of numerous studies, clear methodological rules for this kind of study are often missing, making it difficult to valorize the scope of these results. We propose here a description of methodolog...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602008000300004
更新日期:2008-01-01 00:00:00
abstract::Although evidence is accumulating that prenatal testosterone (T) compromises reproductive function in the female, the effects of excess T in utero on the postnatal development of male reproductive function has not been studied. The aim of this study was to assess the influence of prenatal T excess on age-related chang...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602007000400007
更新日期:2007-01-01 00:00:00
abstract::The neuropeptide oxytocin (OXT) is a key factor in the initiation and regulation of sociosexual behavior. The present study analyzes the effects of cohabitation and social challenge on plasma OXT concentration rates in guinea pig pairs in relation to male sociosexual behavior. The cohabitation phase lasted 3 days. On ...
journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602006000200007
更新日期:2006-01-01 00:00:00
abstract::Brain cells have a highly active oxidative metabolism, yet they contain only low to moderate superoxide dismutase and catalase activities. Thus, their antioxidant defenses rely mainly on cellular reduced glutathione levels. In this work, in cortical neurons we characterized viability and changes in reduced and oxidize...
journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602006000100012
更新日期:2006-01-01 00:00:00