Miracle-dz/UniFAR-FTUs huggingface dataset:
An Investigational Study on the Healing Process of Anterior Spinal Arthrodesis Using a Bioactive Ceramic Spacer and the Change in Load-Sharing of Spinal Instrumentation

Study Design. Ceramic anterior lumbar interbody arthrodesis was performed using an in vivo sheep model. Observations of fusion status and the load-sharing of spinal instrumentation were studied at sequential intervals for 1 year after surgery. Objectives. To elucidate the healing process of spinal arthrodesis performed with a bioactive ceramic spacer and the change in load-sharing of anterior spinal instrumentation. Summary of Background Data. With the improved development of spinal instrumentation, anterior spinal arthrodesis has become a standard spinal reconstruction technique; however, the mechanistic basis underlying the healing process is not well documented. Moreover, it remains unclear how load-distribution through the fusion mass and spinal instrumentation change throughout the healing process. Methods. Using 24 sheep, a two-level anterior lumbar interbody fusion (L2–L3, L4–L5) was performed using a smooth surface and a porous surface-modified bioactive ceramic, with each segment instrumented using a one-rod anterior spinal instrumentation system. Four animals each were killed at 2, 4, 8, 12, 24, and 52 weeks after surgery. Postmortem analysis included quantification of anterior rod strain under multidirectional flexibility testing and radiographic and histologic analyses of the arthrodesed segments. Results. From 0 to 8 weeks after surgery, the bending strain of the rod gradually decreased despite no obvious bone formation. From 8 to 24 weeks after surgery, the rod strain markedly decreased with the development of bridging trabeculated bone formation between vertebral bodies. After 24 weeks after surgery, minimal changes were observed in rod strain; however, the fusion mass volumetrically increased with corresponding facet joint atrophy. The porous surface-modification of ceramic did not influence the histologic healing process, despite the improvement of interface osseous union rate. Conclusions. In anterior spinal arthrodesis, spinal instrumentation is mainly exposed to bending stress, with decreased load-sharing with corresponding development of the spinal fusion. Continuous bone remodeling of the anterior fusion mass results in concurrent decreases in spinal instrumentation and posterior spinal element load-transmission. The principal healing mechanism of ceramic anterior interbody spinal fusion is not an osseous union between the ceramic and vertebral body, but bridging bone formation around the ceramic, which directly connects the vertebral bodies above and below the disc.
Dietary Sources of Nutrients Among US Children, 1989–1991

Objective. To identify major food sources of nutrients and dietary constituents for US children. Methods. Twenty-four-hour dietary recalls were collected from a nationally representative sample of children age 2 to 18 years (n = 4008) from the US Department of Agriculture's 1989–1991 Continuing Survey of Food Intakes by Individuals. For each of 16 dietary constituents, the contribution of each of 113 food groups was obtained by summing the amount provided by the food group for all individuals and dividing by total intake from all food groups for all individuals. Results. Milk, yeast bread, cakes/cookies/quick breads/donuts, beef, and cheese are among the top 10 sources of energy, fat, and protein. Many of the top 10 sources of carbohydrate (yeast bread, soft drinks/sodas, milk, ready-to-eat cereal, cakes/cookies/quick breads/donuts, sugars/syrups/jams, fruit drinks, pasta, white potatoes); protein (poultry, ready-to-eat cereal, pasta); and fat (potato chips/corn chips/popcorn) also contributed >2% each to energy intakes. Ready-to-eat cereal is among the top contributors to folate, vitamin A, vitamin C, iron, and zinc intakes. Fruit drinks, containing little juice, contribute ∼14% of total vitamin C intakes. Conclusions. Fortified foods are influential contributors to many vitamins and minerals. Low nutrient-dense foods are major contributors to energy, fats, and carbohydrate. This compromises intakes of more nutritious foods and may impede compliance with current dietary guidance.
Perceptions of the impact of a large-scale collaborative improvement programme: experience in the UK Safer Patients Initiative.

RATIONALE AND AIMS In several countries, collaborative improvement programmes involving multiple health care organizations have been developed to address the issue of patient safety and reliability of care at an organization-wide level. In the UK, the Health Foundation's Safer Patients Initiative (SPI) was developed to achieve breakthrough improvement in the quality and safety of care in 24 acute hospital Trusts between 2004 and 2008. Research evidence for the effectiveness of programmes of this type and the mechanisms by which positive outcomes are achieved remains limited. We report a multi-method preliminary study based upon phase 1 of SPI to understand participant's perceptions of the local impact of the programme and to form the basis of future research in this area. METHODS Data were collected on the perceived local impact of SPI on a range of clinical, organizational and social dimensions relating to care quality and safety. Data were collected retrospectively from local SPI programme improvement teams using semi-structured interviews and surveys. Qualitative and quantitative analyses were performed, and the results synthesized under common themes and frameworks. RESULTS Specific dimensions of care systems commonly considered to be affected by SPI, included culture, strategic priority, organizational capability and clinical care delivery. Survey data revealed the perceived importance for success of a range of programme components: quality improvement methodology, learning sessions and programme faculty support, along with predefined clinical practice changes. Safety climate and capability dimensions rated as most sensitive to the effects of the SPI programme related to multi-professional engagement and communication, the degree of routine monitoring of care processes and the capacity to evaluate the impact of changes to clinical work systems. CONCLUSIONS Study findings support the view that programmes such as SPI have considerable impact upon the cultural, inter-professional, strategic and organizational aspects of care delivery, in addition to clinical working practices. The specific implications for understanding the effects of complex organization-level interventions and future research design are discussed.
Regulation by glucocorticoids of cell differentiation and insulin‐like growth factor binding protein production in cultured fetal rat nasal chondrocytes

Glucocorticoids (GCs) modulate insulin‐like growth factor action in cartilage through mechanisms that are complex and insufficiently defined, especially in the context of cranio‐facial growth. Because the family of IGF‐binding proteins (IGFBP‐1 to ‐6) is important in the regulation of IGF availability and bioactivity, we examined the effect of GCs on chondrocyte differentiation in correlation with IGFBP production in cultured fetal rat chondrocytes isolated from nasal septum cartilage of fetal rat. Dexamethasone (DEX) effects were tested before and at the onset of extracellular matrix maturation. DEX induced a dose‐dependent increase in the size of cartilage nodule formed, 45Ca incorporation into extracellular matrix, alkaline phosphatase activity, and sulfatation of glycosaminoglycans, maximal effects being obtained with a 10‐mM DEX concentration. The IGFBPs produced by cultured chondrocytes were characterized in culture medium which had been conditioned for 24 h under serum‐free conditions by these cells. Western ligand blotting with a mixture of [125I]IGF‐I and ‐II revealed bands of 20, 24, 29, a 31–32 kDa doublet and a 39–41 kDa triplet which were differently regulated by DEX. Immunoblotting showed that following DEX exposure, IGFBP‐3 and ‐6 were up‐regulated whereas IGFBP‐2, ‐5, and the 24 kDa band were down‐regulated. The effect of DEX on both differentiation and IGFBP production showed a same dependence, and developed when extracellular matrix maturation had been just induced. The results obtained in this chondrocyte culture system show that production of IGFBPs is modulated by DEX at physiological concentrations thus regulating IGF availability and action, a control which could promote the primordial role of the rat nasal septum in craniofacial growth. J. Cell. Biochem. 88: 911–922, 2003. © 2003 Wiley‐Liss, Inc.
Screening for Differential Gene Expression During the Development of Form-Deprivation Myopia in the Chicken

Purpose. To use the technique of differential gene display to analyze changes in gene expression that occur during the development of and recovery from form-deprivation myopia. Methods. The differential display-reverse transcriptase-polymerase chain reaction technique was used to detect cDNAs that are differentially expressed after 24 h (including 12 h in the light) after fitting with a diffuser to induce form-deprivation myopia. Messenger RNA levels were determined by quantitative Northern blotting in retinas after 11 days of form deprivation or in retinas where the diffusers had been removed the previous day. Results. Twenty-six differentially expressed genes were processed in our initial screen. Two of these, &agr;B-crystallin and retinoic acid receptor-&agr;, were studied further. Levels of &agr;B-crystallin mRNA were increased on day 11 in retinas from form-deprived eyes relative to eyes of control chickens and were reduced to below those levels within 6 to 12 h after removal of the diffusers. Levels of retinoic acid receptor-&agr; mRNA showed similar changes, except that after removal of the diffusers, the levels further increased. Conclusions. The technique of differential gene display can be used to detect changes in gene expression during the regulation of eye growth. The response of &agr;B-crystallin is particularly interesting because expression increases when eye growth is high and decreases when eye growth slows.
Asparagine-linked Oligosaccharides Are Localized to a Luminal Hydrophilic Loop in Human Glucose-6-Phosphatase*

Deficiency of glucose-6-phosphatase (G6Pase), an endoplasmic reticulum transmembrane glycoprotein, causes glycogen storage disease type 1a. We have recently shown that human G6Pase contains an odd number of transmembrane segments, supporting a nine-transmembrane helical model for this enzyme. Sequence analysis predicts the presence of three potential asparagine (N)-linked glycosylation sites, N96TS, N203AS, and N276SS, conserved among mammalian G6Pases. According to this model, Asn96, located in a 37-residue luminal loop, is a potential acceptor for oligosaccharides, whereas Asn203 and Asn276, located in a 12-residue cytoplasmic loop and helix 7, respectively, would not be utilized for this purpose. We therefore characterized mutant G6Pases lacking one, two, or all three potential N-linked glycosylation sites. Western blot and in vitro translation studies showed that G6Pase is glycosylated only at Asn96, further validating the nine-transmembrane topology model. Substituting Asn96 with an Ala (N96A) moderately reduced enzymatic activity and had no effect on G6Pase synthesis or degradation, suggesting that oligosaccharide chains do not play a major role in protecting the enzyme from proteolytic degradation. In contrast, mutation of Asn276 to an Ala (N276A) destabilized the enzyme and markedly reduced enzymatic activity. We present additional evidence suggesting that the integrity of transmembrane helices is essential for G6Pase stability and catalytic activity.
Academic Difficulty and Vision Symptoms in Children with Concussion.

PURPOSE Academic difficulty is reported in children with prolonged post-concussive symptoms. Despite growing evidence that vestibular-ocular and vision-specific dysfunction are common in children after concussion, vision is rarely mentioned in return-to-learn protocols. The purpose of this project was to evaluate a cohort of children with prolonged post-concussive symptoms to determine if vision symptoms are associated with those reporting academic difficulty. METHODS Data were obtained from the Children's of Alabama Concussion Clinic REDCap dataset from the period January 2007 to October 2013. From this dataset of 1033 concussion events, a cohort of 276 children aged 5 to 18 years with three or more concussion-related symptoms present for 10 days or more was identified. A cross-sectional cohort study was undertaken to evaluate the association of concussion symptoms, SCAT2 scores, and demographic and concussion severity markers to reported educational difficulty among children with prolonged post-concussive symptoms. Univariate and multivariate logistic regression techniques were used to model the association of reported educational difficulty to self-reported vision abnormalities. RESULTS Mean age was 13.8 years. Median time since the concussive event was 21 days, with 33% (95/276) reporting their concussion more than 30 days before data collection. Academic difficulty was reported by 29% (79/270) and vision abnormalities in 46% (128/274). After model reduction, vision symptoms (OR 2.17, 95% CI 1.02, 4.62), hearing disturbance (OR 2.39, 95% CI 1.06, 5.36), and concentration difficulty (OR 21.62, 95% CI 9.50, 44.47) remained associated with academic difficulty. For those with symptoms 30 days or more after concussion, only vision (OR 3.15, 95% CI 1.06, 9.38) and concentration difficulty (OR 15.33, 95% CI 4.99, 47.05) remained statistically significant. CONCLUSIONS Vision problems were commonly reported in children with concussions and were independently associated with those reporting academic difficulty. Comprehensive vision assessment should be considered in children reporting academic difficulty and in the development of return-to-learn protocols.
Production of Adenosine from Extracellular ATP at the Striatal Cholinergic Synapse

Abstract: The components of the ectonucleotidase pathway at the immunoaffinity‐purified striatal cholinergic synapse have been studied. The ecto‐ATPase (EC 3.6.1.15) had a Km of 131 γM, whereas the ecto‐ADPase (EC 3.6.1.6) had a Km of 58 γM, was Ca2+‐dependent, and was inhibited by the ATP analogue 5′‐adenylylimidodiphosphate (AMPPNP). The ecto‐5′‐nucleotidase (EC 3.1.3.5) had a Km of 21 γM, was inhibited by AMPPNP and α,β‐methylene ADP, and by a specific antiserum. The Vmax values of the ATPase, ADPase, and 5′‐nucleotidase enzymes present at this synapse were in a ratio of 30:14:1. Very little ecto‐adenylate kinase activity was detected on these purified synapses. The intraterminal 5′‐nucleotidase enzyme, which amounted to 40% of the total 5′‐nucleotidase activity, was inhibited by AMPPNP, α,β‐methylene ADP, and the antiserum, and also had the same kinetic properties as the ectoenzyme. The time course of ATP degradation to adenosine outside the nerve terminals showed a delay, followed by a period of sustained adenosine production. The delay in adenosine production was proportional to the initial ATP concentration, was a consequence of feedforward inhibition of the ADPase and 5′‐nucleotidase, and was inversely proportional to the ecto‐5′‐nucleotidase activity. The function and characteristics of this pathway and the central role of 5′‐nucleotidase in the regulation of extraterminal adenosine concentrations are discussed.
Structural plasticity of hippocampal mossy fiber synapses as revealed by high‐pressure freezing

Despite recent progress in fluorescence microscopy techniques, electron microscopy (EM) is still superior in the simultaneous analysis of all tissue components at high resolution. However, it is unclear to what extent conventional fixation for EM using aldehydes results in tissue alteration. Here we made an attempt to minimize tissue alteration by using rapid high‐pressure freezing (HPF) of hippocampal slice cultures. We used this approach to monitor fine‐structural changes at hippocampal mossy fiber synapses associated with chemically induced long‐term potentiation (LTP). Synaptic plasticity in LTP has been known to involve structural changes at synapses including reorganization of the actin cytoskeleton and de novo formation of spines. While LTP‐induced formation and growth of postsynaptic spines have been reported, little is known about associated structural changes in presynaptic boutons. Mossy fiber synapses are assumed to exhibit presynaptic LTP expression and are easily identified by EM. In slice cultures from wildtype mice, we found that chemical LTP increased the length of the presynaptic membrane of mossy fiber boutons, associated with a de novo formation of small spines and an increase in the number of active zones. Of note, these changes were not observed in slice cultures from Munc13‐1 knockout mutants exhibiting defective vesicle priming. These findings show that activation of hippocampal mossy fibers induces pre‐ and postsynaptic structural changes at mossy fiber synapses that can be monitored by EM. J. Comp. Neurol. 520:2340–2351, 2012. © 2012 Wiley Periodicals Inc.
Acoustic Analysis of Speech Timing in Huntington′s Disease

Duration measurements at the acoustic speech signal of sentence utterances including syllable lengths, vowel durations, and voice-onset-time (VOT) were performed in 13 subjects with Huntington's disease (HD) and in 12 control speakers. First, all 13 HD subjects presented with increased variability of utterance duration and/or VOT. Second, a subgroup had reduced speech tempo concomitant with overproportional lengthening of short vowels. Presumably, these deviations result from slowed movement execution (bradykinesia) and delayed between-movement transitions. Third, durational parameters of phonetic timing, e.g. stress contrast, were largely unimpaired. In a further patient (HD14) severely reduced articulatory accuracy did not allow acoustic measurements. He presented with truncated, barely intelligible, diphthongized sentence utterances. A slight tendency for these deviations could be noted in two of the HD subjects who underwent acoustic analysis. Since all three subjects had a rather long disease duration, this constellation might represent an advanced stage of HD dysarthria into which the other syndromes ultimately will develop.
The transitional zone and CNS regeneration

Most nerves are attached to the neuraxis by rootlets. The CNS–PNS transitional zone (TZ) is that length of rootlet containing both central and peripheral nervous tissue. The 2 tissues are separated by a very irregular but clearly defined interface, consisting of the surface of the astrocytic tissue comprising the central component of the TZ. Central to this, myelin sheaths are formed by oligodendrocytes and the supporting tissue is astrocytic. Peripheral to it, sheaths are formed by Schwann cells which are enveloped in endoneurium. The features of transitional nodes are a composite of those of central and peripheral type. The interface is penetrated only by axons. It is absent at first. It is formed by growth of processes into the axon bundle from glial cell bodies around its perimeter. These form a barrier across the bundle which fully segregates prospectively myelinated axons. Rat spinal dorsal root TZs have been used extensively to study CNS axon regeneration. The CNS part of the TZ responds to primary afferent axon degeneration and to regenerating axons in ways which constitute a satisfactory model of the gliotic tissue response which occurs in CNS lesions. It undergoes gliosis and the gliotic TZ tissue expands distally along the root. In mature animals axons can regenerate satisfactorily through the endoneurial tubes of the root but cease growth on reaching the gliotic tissue. The general objective of experimental studies is to achieve axon regeneration from the PNS through this outgrowth and into the dorsal spinal cord. Since immature tissue has a greater capacity for regeneration than that of the adult, one approach includes the transplantation of embryonic or fetal dorsal root ganglia into the locus of an extirpated adult ganglion. Axons grow centrally from the transplanted ganglion cells and some enter the cord. Other approaches include alteration of the TZ environment to facilitate axon regeneration, for example, by the application of tropic, trophic, or other molecular factors, and also by transplantation of cultured olfactory ensheathing cells (OECs) into the TZ region. OECs, by association with growing axons, facilitate their extensive regeneration into the cord. Unusually, ventral motoneuron axons may undergo some degree of unaided CNS regeneration. When interrupted in the spinal cord white matter, some grow out to the ventral rootlet TZ and thence distally in the PNS. The DRTZ is especially useful for quantitative studies on regeneration. Since the tissue is anisometric, individual parameters such as axon numbers, axon size and glial ensheathment can be readily measured and compared in the CNS and PNS environments, thereby yielding indices of regeneration across the interface for different sets of experimental conditions.
Functional studies of nonpeptide angiotensin II receptor subtype-specific ligands: DuP 753 (AII-1) and PD123177 (AII-2).

DuP 753 and PD123177 are two nonpeptide angiotensin II (AII)-specific ligands, which show high affinities for two respective and distinct subtypes of AII binding sites, i.e., AII-1 and AII-2 sites, respectively, in the rat adrenal gland, brain and uterus. The objective of this study is to identify the functions of these subtype binding sites in the adrenal, sympathetic ganglia, brain and vascular smooth muscle. In conscious rats, DuP 753 at 1, 3 and 10 mg/kg i.v. but not PD123177 at 30 and 100 mg/kg i.v. inhibited the AII-induced aldosterone increase. In the isolated perfused rat adrenal gland, DuP 753 at 10(-6) and 10(-4) M but not PD123177 at 10(-3) M blocked the AII-induced epinephrine secretion. In control and chemically sympathectomized pithed rats, the pressor and tachycardiac responses to AII were blocked by DuP 753 at 10 mg/kg i.v. but not by PD123177 at 100 mg/kg i.v. In conscious rats, DuP 753 at 10 mg/kg s.c. but not PD123177 at 100 mg/kg s.c. inhibited the AII-induced water drinking. In the rabbit aorta, DuP 753 at 10(-6) M but not PD123177 at 10(-4) M inhibited the contractile effect of AII. In conscious renal artery-ligated hypertensive rats, DuP 753 but not PD123177 at 0.1 to 10 mg/kg i.v. lowered blood pressure. In summary, a function of the PD123177-sensitive AII binding site (AII-2) has not yet been identified. However, the DuP 753-sensitive site (AII-1) appears to mediate the AII-induced responses such as adrenal aldosterone and catecholamine secretion, release of catecholamine from sympathetic ganglia, drinking and vasoconstriction.