Abstract:
:Protein crystallography, which has a growing role in the human genome project, is one of the most powerful techniques in modern biology. However, it can only be applied providing suitable crystals can be obtained. The ability to produce suitable crystals is currently the major bottleneck to structure determination. Microgravity, which is used as a tool for improving crystal growth, is a high-profile enterprise, especially with the upcoming prospects for utilizing the International Space Station, yet the issue of crystallization in microgravity is an extremely controversial one. In spite of numerous experiments conducted in microgravity during 16 years, the reported success rate, measured in terms of various improvements witnessed in the perfection of protein crystals, has been a mere 20%. In this paper we present experimental evidence, supporting previous fluid physics calculations to show that in many cases the potential benefits of the microgravity environment have not been fully exploited. These findings offer an explanation for the low rate of success and open up the possibility for enhancing the efficiency of experimentation in microgravity. Furthermore, these findings extend into a number of other disciplines involving fluid physics.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Chayen NE,Helliwell JRdoi
10.1111/j.1749-6632.2002.tb05933.xsubject
Has Abstractpub_date
2002-10-01 00:00:00pages
591-7eissn
0077-8923issn
1749-6632journal_volume
974pub_type
杂志文章abstract::The Trk family of tyrosine-protein kinases, TrkA, TrkB, and TrkC, are the signaling receptors that mediate the biological properties of the NGF family of neurotrophins. This family of growth factors includes in addition to NGF, BDNF, NT-3, and NT-4. TrkA is the NGF receptor. TrkB serves as a receptor for both BDNF and...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1995.tb26693.x
更新日期:1995-09-07 00:00:00
abstract::Red spruce (Picea rubens Sarg.) and balsam fir (Abies balsamea (L.) Mill.) were present by 13,700 years B.C.E. in the Catskills Mountains of southeastern New York State. These conifers were, and still are, largely confined to the eastern and far western portions of the region. A gap in the distribution exists between ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/nyas.12274
更新日期:2013-09-01 00:00:00
abstract::An inactive form of erythrocyte CA I was found in patients with primary aldosteronism. The levels of CA I in the patients were within the normal range: however, the specific esterase activity of CA I from three patients was in the range of 0.12-0.26 u/mg CA I (normal control: 0.66 +/- 0.1 u/mg CA I). In one subject, w...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1984.tb12353.x
更新日期:1984-01-01 00:00:00
abstract::Higher levels of body fat are associated with increased risk for development of numerous adverse health conditions. Phytochemicals are potential agents to inhibit differentiation of preadipocytes, stimulate lipolysis, and induce apoptosis of existing adipocytes, thereby reducing adipose tissue mass. Resveratrol decrea...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.2010.05845.x
更新日期:2011-01-01 00:00:00
abstract::Human germ-cell tumors (GCTs) are a heterogeneous group of neoplasms. Based on epidemiology, anatomical site of presentation, histology, chromosomal constitution, and pattern of genomic imprinting, GCTs are classified into five entities. Within the testis, three types of GCTs can be diagnosed: type I (teratomas and yo...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1411.000
更新日期:2007-12-01 00:00:00
abstract::The risk of cardiovascular (CV) disease increases in patients with rheumatoid arthritis (RA). This is due to a number of different triggers including traditional and disease-related factors. Among established risk factors for CV disease, smoking may exert a more dangerous effect on arterial wall in RA than in the gene...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1422.038
更新日期:2007-06-01 00:00:00
abstract::Antibodies to double-stranded desoxyribonucleic acid (dsDNA) and to the polymyositis/scleroderma (PM/Scl) complex are regarded as serological markers for systemic lupus erythematosus (SLE) and PM/Scl overlap syndrome, respectively. In a previous study, serum samples were identified that contained antibodies specific f...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1196/annals.1398.037
更新日期:2007-08-01 00:00:00
abstract::The present paper reviews the major modes of action of estrogen on the molecular, cellular, tissue, and neurobehavioral levels of mammalian physiology, with an emphasis on the brain as an estrogen target tissue. We draw a distinction between receptor- and nonreceptor-mediated actions, as well as delineate the range of...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1999.tb07988.x
更新日期:1999-01-01 00:00:00
abstract::Perception, preference, and selection are all objectively measurable performances that discriminate between different levels of entities such as the sugar, thickener, or protein in a food. A rating or an intake may not be controlled by the word that the experimenter or the subject uses to describe it: "protein"-orient...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1989.tb20985.x
更新日期:1989-01-01 00:00:00
abstract::The wide use of ABPM has resulted in greater appreciation of the circadian time structure of BP variability and its clinical relevance. It is now recognized that the day-night change in BP results from an interplay of circadian rhythms in neurohumoral mechanisms coupled with temporal patterns in physical activity and ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1996.tb26724.x
更新日期:1996-08-15 00:00:00
abstract::Certain livestock diseases in sub-Saharan Africa, such as foot-and-mouth disease are difficult to control because of the large numbers of infected wildlife hosts. These wildlife disease reservoirs form a continuous hazard of transmittal of the diseases to domestic livestock, which limits the access of livestock produc...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.2002.tb04377.x
更新日期:2002-10-01 00:00:00
abstract::This study explores the mechanisms dominating the regulation of the biochemical energy consumption and the mechanical output of the actin-myosin motor units, the crossbridges (Xbs), in the cardiac sarcomere. Our analytical model, which couples Xbs cycling dynamics with the kinetics of the free Ca(2+) binding to tropon...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1302.006
更新日期:2004-05-01 00:00:00
abstract::Legally, women, Native Americans, and African-Americans were defined by the American Constitution as inferior. The pragmatists gradually showed that all selves are equal. These ideas helped the minorities to attain nearly full legal status. But economic status is going in the other direction, toward inequality. It thr...
journal_title:Annals of the New York Academy of Sciences
pub_type: 历史文章,杂志文章
doi:10.1111/j.1749-6632.2011.06191.x
更新日期:2011-10-01 00:00:00
abstract::The objective of this study was to visualize androgen receptors (ARs) in the testis, epididymis, and prostate of the stallion by means of immunohistochemistry. Nuclear immunostaining was found in all somatic cells in the testis--Leydig, Sertoli, and peritubular myoid cells; in both types of epithelial cells of the epi...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1196/annals.1327.030
更新日期:2005-04-01 00:00:00
abstract::Vestibular stimulation by head accelerations always involves multisensory activation of the vestibular, somatosensory, and visual systems. Over the past few years, galvanic vestibular stimulation (GVS) has become increasingly popular for testing vestibular function for clinical and research purposes. Although GVS prov...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:
更新日期:2003-10-01 00:00:00
abstract::Cardiac tissue engineering promises to revolutionize the treatment of patients with end-stage heart failure and provide new solutions to the serious problem of heart donor shortage. By its broad definition, tissue engineering involves the construction of tissue equivalents from donor cells seeded within three-dimensio...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1302.026
更新日期:2004-05-01 00:00:00
abstract::These experiments sought to: (1) determine if alpha 2/I1 agonists that are topically active on the eye have similar effects on intraocular pressure when applied to the CNS and (2) ascertain whether these agents lower IOP, in part, via central alpha 2 receptors and/or imidazoline (I1) receptors. New Zealand White rabbi...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1995.tb32436.x
更新日期:1995-07-12 00:00:00
abstract::We have presented a perspective of progress in three areas of simulations of complex molecules: the development of force fields for molecular simulation; the application of computer graphics, molecular mechanics and molecular dynamics in simulations of DNA and DNA-drug complexes and the application of computer graphic...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1986.tb20954.x
更新日期:1986-01-01 00:00:00
abstract::The endocannabinoid system, through the cannabinoid receptor CB1, is involved in the modulation of adaptive responses to environmental conditions. However, little is known about the role of the cannabinergic system, particularly CB1 receptor expression, in relation to the effects induced by xenoestrogens concerning th...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.2009.04455.x
更新日期:2009-04-01 00:00:00
abstract::Parkinson's disease is a neurodegenerative process characterized by progressive degeneration of the substantia nigra and concurrent loss of neuromelanin in these structures. The present hypothesis suggests that progression of Parkinson's disease may be reduced by enhancing the regional levels of neuroprotective factor...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1196/annals.1418.013
更新日期:2008-11-01 00:00:00
abstract::Since NTS neurons receive synaptic input from many sensory modalities, it is crucial to understand the neuronal mechanisms involved in synaptic processing. We have proposed that GABA-containing neurons in the NTS are the primary target for somatic afferent fibers activated by skeletal muscle contraction. In our model,...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:
更新日期:2001-06-01 00:00:00
abstract::The proximate hurdle for cell trafficking to any anatomic site is the initial attachment of circulating cells to target tissue endothelium with sufficient strength to overcome prevailing forces of blood flow. E-selectin, an endothelial molecule that is inducibly expressed at all sites of inflammation, is a potent effe...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.2011.06421.x
更新日期:2012-04-01 00:00:00
abstract::A short review of current concepts concerning the origin and kinetics of monocytes and macrophages is given, and the humoral regulation of monocyte production by FIM, a factor synthesized and secreted by macrophages, is discussed. Genetic control of the responsiveness of monocyte precursors to FIM and that of the phag...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1986.tb18476.x
更新日期:1986-01-01 00:00:00
abstract::A high index of suspicion is essential in arriving at the correct diagnosis of Lambert-Eaton myasthenic syndrome (LEMS). LEMS should be considered in the differential in any patient who has proximal weakness, reduced or absent muscle stretch reflexes, and dry mouth. Weakness predominates in hip and shoulder muscles, b...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1254.065
更新日期:2003-09-01 00:00:00
abstract::Flow cytometers are instruments that can determine multiparameter data simultaneously and have a great potential in providing unique information about cells. To transfer this potential to the clinical laboratory, the development and the proper use of standards and calibrators are required to ensure comparability and r...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1993.tb38760.x
更新日期:1993-03-20 00:00:00
abstract::A four- to fivefold overexpression of the gene for the Alzheimer beta/A4 amyloid precursor protein (APP) in individuals with Down's Syndrome (DS) appears to be responsible for the fifty year earlier onset of Alzheimer's disease (AD) pathology in DS compared to the normal population. It is therefore likely that a dereg...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1993.tb23035.x
更新日期:1993-09-24 00:00:00
abstract::Sphingosine 1-phosphate (S1P) is an ubiquitously present extracellular lipid mediator that is released by several cell types, particularly by activated platelets. The effects of S1P are mediated by a specific family of G protein-coupled sphingosine 1-phosphate receptors (S1P1-S1P5). We demonstrate that S1P acts on hem...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1349.011
更新日期:2005-06-01 00:00:00
abstract::The melanocortin (MC)-4 receptor participates in regulating body weight homeostasis. We demonstrated early that acute blockage of the MC-4 receptor increases food intake and relieves anorexic conditions in rats. Our recent studies show that 4-week chronic blockage of the MC-4 receptor leads to robust increases in food...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.2003.tb03164.x
更新日期:2003-06-01 00:00:00
abstract::We have been interested in the consequences of foreign DNA insertion into established mammalian genomes and have initially studied this problem in adenovirus type 12 (Ad12)-transformed cells or in Ad12-induced hamster tumors. Since integrates are frequently methylated de novo, it appears that they might be modified by...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.2001.tb03896.x
更新日期:2001-09-01 00:00:00
abstract::Ovarian failure is heterogeneous, both in cause and in phenotype. Women whose menses cease prior to age 40 years and have menopausal FSH levels are traditionally considered by clinicians to have the diagnosis of "premature ovarian failure" (POF). In fact, however, the ovarian function in this disorder is in reality a ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1429.019
更新日期:2008-01-01 00:00:00