Neurofibromatosis type 1 (NF1), also known as Von Recklinghausen disease, is a rare genetic disorder that is transmitted in an autosomal dominant fashion, with complete penetrance and variable expressivity. It is caused by a mutation in the
gene located on chromosome 17q11.2 which encodes for neurofibromin, a tumor suppressive protein involved in RAS signaling pathways
. The disease is 50%sporadic or inherited, and it occurs with an estimated frequency of approximately 1:2500-1:3500, without any known gender or ethnic predilections. Individuals with NF1 are prone to the development of both malignant and benign nervous system tumors, skeletal dysplasia, and skin abnormalities
.
醫(yī)學(xué)研究生在文獻(xiàn)信息檢索及應(yīng)用方面主要存在以下幾方面的問題:文獻(xiàn)信息意識(shí)淡?。晃墨I(xiàn)信息檢索知識(shí)短缺;文獻(xiàn)信息使用能力薄弱。目前研究生大多使用網(wǎng)絡(luò)搜索引擎來查找專業(yè)資料,并且大部分學(xué)生并不知道有很多專業(yè)數(shù)據(jù)庫可提供所需的專業(yè)文獻(xiàn)資源,而在文獻(xiàn)類型的利用上,對會(huì)議論文、專利文獻(xiàn)、標(biāo)準(zhǔn)文獻(xiàn)和科技報(bào)告的利用率不高[3]。同時(shí),我國高等教育機(jī)構(gòu)的文獻(xiàn)信息知識(shí)教育體系不夠完善,大部分高校的文獻(xiàn)檢索課程是選修課,教學(xué)大綱、教材 、課時(shí) 、考核等各校沒有統(tǒng)一的標(biāo)準(zhǔn),不利于研究生對文獻(xiàn)信息知識(shí)的系統(tǒng)掌握。
①劉志彪:《為高質(zhì)量發(fā)展而競爭:地方政府競爭問題的新解析》,《河海大學(xué)學(xué)報(bào)》(哲學(xué)社會(huì)科學(xué)版)2018年第2期;何艷玲、李妮:《為創(chuàng)新而競爭:一種新的地方政府競爭機(jī)制》,《武漢大學(xué)學(xué)報(bào)》(哲學(xué)社會(huì)科學(xué)版)2017年第1期。
阿爾及利亞蓋爾達(dá)耶是一座矗立在撒哈拉北部已有千年歷史的神秘古城,它曾給柯布西耶、原廣司、山本理顯、隈研吾和西澤立衛(wèi)等建筑師帶來啟示,默默地影響著世界建筑的走向。蓋爾達(dá)耶在不斷的發(fā)展與更新中衍生出獨(dú)特的聚落特征,對抗著沙漠中的光與熱,也以其獨(dú)特的格局庇護(hù)著守衛(wèi)它的生靈。
根據(jù)《意見》要求,各高校對創(chuàng)新創(chuàng)業(yè)教育理論和實(shí)踐都進(jìn)行了有益的探索,如開發(fā)就業(yè)創(chuàng)業(yè)課程體系、制定學(xué)分轉(zhuǎn)換政策、搭建創(chuàng)新創(chuàng)業(yè)實(shí)踐平臺(tái)、建立創(chuàng)客空間等,為大學(xué)生進(jìn)行個(gè)性化指導(dǎo)和持續(xù)性幫扶,并取得了一定的成績。在校創(chuàng)業(yè)學(xué)生可以享受到專業(yè)導(dǎo)師指導(dǎo)、固定場地保障、濃厚創(chuàng)業(yè)氛圍等有利條件。可一旦畢業(yè),這些學(xué)生即將面臨優(yōu)厚待遇“失效”的窘境。這也使學(xué)生的創(chuàng)業(yè)面臨更多困難,高校不能充分發(fā)揮“扶上馬,送一程”的責(zé)任。這時(shí)就需要社區(qū)創(chuàng)客空間發(fā)揮其服務(wù)終身學(xué)習(xí)、致力創(chuàng)新創(chuàng)業(yè)繼續(xù)教育的優(yōu)勢。
However, electrophysiological abnormalities were also reported in the absence of optic gliomas in NF1 patients.Specifically, abnormal VEPs were described in NF1 regardless of the presence of gliomas of the optic pathways or of the brain. These findings were ascribed to a primary abnormality of visual processing in NF1
. Similarly, our group demonstrated subclinical impairment in the conduction of visual stimuli in patients with NF1 and absence of any condition affecting the optical pathways, as assessed on VEPs and frequency-doubling technology (FDT) campimetry
.
Unlike the optical pathways, electrophysiological evaluation of the neuroretina as an earlier indicator of the damage to the axons forming the optic nerve in NF1 has scarcely been characterized. Experimental studies on murine models of NF1 and OPGs showed progressive loss by apoptosis of retinal ganglion cells (RGCs) occurring in early phases of OPG development
. In accordance, inner retinal dysfunction was reported in a subgroup of patients with NF1 and OPGs on electroretinogram (ERG) examination
.
However, neuroretinal function in NF1 in the absence of OPGs is a relatively unknown topic.
Each subject underwent detailed clinical examination including: Snellen measurement of the BCVA, biomicroscopic examination of the anterior segment, Goldmann applanation tonometry, mydriatic indirect fundus biomicroscopy, crosssectional spectral domain-optical coherence tomography(SD-OCT) and SD-OCT in near-infrared reflectance (NIR)modality, mfERG exam. Additionally, all NF-1 patients underwent 1.5-Tesla magnetic resonance imaging (MRI) scan of the brain to assess the presence of OPGs.
The mfERG is a technique that allows local ERG responses to be recorded simultaneously from many regions of the retina
. Specifically, through the simultaneous stimulation of multiple retinal areas and recording of each response independently, mfERG provides a topographic measure of retinal electrophysiological activity in the central 25 degrees retina.
Therefore, the aim of this study was to examine retinal function by using the mfERG test in NF1 patients without OPGs and any other disorder of the visual pathways.
This observational, cross-sectional study was conducted at the University of Rome ‘Sapienza’, Umberto I Hospital, Italy, from June 2019 to February 2020. The study was prospectively reviewed by the Ethics Committee of the Sapienza University of Rome. The research followed the tenets of the Declaration of Helsinki, and informed consent was obtained from all subjects of the study.
傳統(tǒng)游戲很有趣,但是面對快速發(fā)展的社會(huì),幼兒更加愿意接受新事物。幼兒教師本來在年齡上與幼兒就有很大的距離,為了近距離和幼兒的心靈接觸,就要在保持一顆童心的基礎(chǔ)上與時(shí)俱進(jìn),這樣才會(huì)更容易被幼兒所接受和信任。教學(xué)中我們要根據(jù)教學(xué)大綱開發(fā)具有時(shí)代特征的游戲。
如何正確運(yùn)用單因素方差分析——藥物研究中的統(tǒng)計(jì)學(xué)(二)……………………… 《藥學(xué)與臨床研究》編輯部(2·159)
SD-OCT scans were obtained with the Spectralis OCT(Spectralis Family Acquisition Module, V 5.1.6.0; Heidelberg Engineering, Heidelberg, Germany), following a standardized protocol.
Inclusion criteria were: best corrected visual acuity (BCVA)not less than 20/20 in each eye, refractive defects less than±4 D (spherical equivalent), absence of OPGs and any other disorder of the visual pathways, absence of ocular, systemic and/or neuroretinal pathologies that could affect retinal function, absence of NF1-related manifestations at fundus oculi examination.
Exclusion criteria included: poor collaboration which prevented the correct execution of diagnostic exams, excessive signal-to-noise ratio, artifacts and non-uniform waveforms at mfERG.
Healthy subjects were recruited from outpatients of the eye clinic of the University of Rome ‘Sapienza’.
In the present study, we assessed neuroretinal function by using the multifocal electroretinography (mfERG).
2018年3月初,順豐收購新邦71%股份,成立新公司“順心”。新邦原有資產(chǎn)和業(yè)務(wù)將轉(zhuǎn)移到新公司,而順豐則通過此次收購的方式,快速布局零擔(dān)市場。
We included 35 consecutive patients (35 eyes; 21 females and 14 males) between 18 and 55 years of age (mean age:31±10.1y) with a diagnosis of NF1 based on the National Institutes of Health (NIH) criteria
and 30 healthy subjects(HC group; 30 eyes; 17 females, 13 males) between 18 and 60 years of age (mean age 33.30±6.0y) for control group.
The mfERG exam was performed after administration of 1%tropicamide topical solution in both eyes, followed by an adaptation to daylight for about 30min. The mfERG recording was performed by using an ERG-Jet corneal contact lens active electrode under topical anesthetic solution of 0.5% benoxinate topical solution in the subject eye. The reference electrode was attached next to the corresponding outer canthus. The neutral electrode was applied with conduction gel on the patient’s earlobe. The examination was performed individually for each eye for a duration of approximately 5-7min, with application of a bandage on the fellow eye. Each patient was placed on the chin-guard of the visual stimulator at 33 cm from the display and was corrected with a temple lens for near vision, where required, due to the pharmacologically induced accommodative block. The stimulus was represented by a pseudorandomized sequence of alternating light and dark hexagonal flashes, with any given flash having a 50% possibility to change in each single frame
. Electrodes were connected with a junctional box from which the amplified signals were delivered to a digital recording system for graphic transformation into a path of negative and positive waves. The mfERG signals were analyzed on the computerized Optoelectronic Stimulator Vision Monitor MonPack 120 Metrovision (Perenchies,France) with reference to the International Society for Clinical
Electrophysiology of Vision (ISCEV) guidelines
. The first order Kernel mfERG component was used to evaluate amplitude and implicit times of N1, P1, and N2 wave peaks.The areas were analyzed in quadrants from 2 to 25 degrees of eccentricity relative to fixation and the analysis generated a histogram for each of the extended zones. The analysis was carried out on 6 zones: the 2 central degrees, the 4 quadrants from 2 to 25 degrees of eccentricity, and the overall average of the 4 quadrants, for an array of 61 hexagons scaled with eccentricity by means of the 61 program. The analysis of mfERG data was performed in two steps: analysis of the trace arrays, evaluating the shape of the wave; and group averages,evaluating the differences of the absolute values of amplitude and implicit time of P1 wave between NF1 and HC groups.
The right eye was selected for data analysis in each study subject, and assessors were masked to whether or not the patients and controls had NF1.
The normal distribution of data was assessed using the D’Agostino-Pearson test. Statistical significance was determined by Fisher’s exact test for qualitative variables.Comparisons between groups were performed by Student
-test and Mann-Whitney
test, respectively for normally and not normally distributed data. Comparisons between more than 2 groups were performed by repeated measures ANOVA test and Friedman test, respectively for normally and not normally distributed data. A value of
≤0.05 was considered statistically significant. Statistical analysis was performed using Graph Pad vers. 8.0.2 and IBM
SPSS
Statistics version 24.0 (IBM Corp., Armonk, NY, USA) on the Windows 10 Home edition platform. v22 (IBM SPSS Statistics, IBM
, IL, USA).
中國城鄉(xiāng)二元結(jié)構(gòu)體系的基本特征將公民分為兩類,對城鎮(zhèn)居民和農(nóng)民實(shí)行不同的政策。然而長期實(shí)行這種體制的后果就是農(nóng)村和城市的發(fā)展不均衡,城鄉(xiāng)差距越來越大,對農(nóng)民的生產(chǎn)積極性和生產(chǎn)力造成了嚴(yán)重束縛。打破城鄉(xiāng)二元結(jié)構(gòu)體系,可以從戶籍制度改革和土地集體所有制入手。政府應(yīng)采取相關(guān)政策,解除戶籍制度的限制,實(shí)現(xiàn)農(nóng)民與城鎮(zhèn)居民戶口的平等;并改革土地所有制,對土地制度進(jìn)行一定的調(diào)整,制定相關(guān)詳細(xì)的法規(guī)并加以規(guī)范,充分保障農(nóng)民的土地財(cái)產(chǎn)權(quán)。只有實(shí)行戶籍制度和土地制度改革,才能打破城鄉(xiāng)二元結(jié)構(gòu)體系,保障農(nóng)民的土地產(chǎn)權(quán)。
Five eyes in NF1 group and 5 eyes in the HC group were excluded due to excessive signal-to-noise ratio on mfERG.Therefore, the final samples consisted of 30 patients (18 females, 12 males), mean age 30.8±10.47y, for a total of 30 eyes examined; whereas HC group consisted of 25 subjects(14 females, 11 males), mean age 33.76±6.1y, for a total of 25 eyes examined. There were no significant differences between groups in terms of age and gender (Table 1).
The BCVA was 20/20 in all patients, as per inclusion criteria.Lisch nodules were detected in 25 eyes (83.3%) of NF1 patients and none of the HC group. Intraocular pressure was within normal limits in the totality of patients. No pathologic alterations were identifiable at mydriatic indirect fundus biomicroscopy exam in both the NF1 and HC group.
At cross-sectional SD-OCT and NIR-OCT evaluation, 28 eyes out of 30 (93.3%) in the NF1 group showed the presence of choroidal nodules variously distributed to the posterior pole,whereas no choroidal abnormalities were recognizable in the HC group (Figure 1). At MRI evaluation, no patient had optic nerve gliomas or other lesions involving the optic pathways.The analysis of the trace arrays showed no differences in the uniformity of the waveforms between NF1 patients and HC subjects. NF1 patients had significantly lower values of the P1-wave amplitudes in all of the 4 quadrants when compared to HC (Table 1, Figures 2 and 3), whereas, there were no differences of the P1-wave amplitude in the 2 central degrees between the groups. In addition, a statistically significant difference was observed among the P1 wave amplitudes as recorded in the 4 quadrants within the NF1 group. Specifically,lower amplitudes were recorded in the nasal quadrants(Table 2, Figure 4). Similar results were obtained for the HCs as summarized in Table 2. Table 2 shows the comparison analyses among the P1-wave amplitudes as evaluated in the 4 quadrants in NF1 patients and HC subjects. No statistically significant differences were observed in the absolute values of implicit time between NF1 patients and HCs (Table 1).Moreover, no differences were observed in the implicit times as recorded in the 4 quadrants within the NF1 group and among HCs.
The purpose of our study was to examine neuroretinal function in NF1 patients without OPGs compared to a group of HCs by the use of mfERG. The mfERG is a validated methodology for clinical evaluation of several conditions,including retinitis pigmentosa, hydroxychloroquine toxicity,glaucoma, ocular vascular occlusive disorders
. Revealing subclinical abnormalities of retinal function, mfERG can identify patients at risk of retinal damage progression allowing for early therapeutic interventions
. Currently, there are no available studies in the literature investigating the value of mfERG in NF1 patients. Limited studies demonstrated retinal electrofunctional anomalies in NF1 regardless of the presence of OPGs, although the clinical meaning of these findings is still unknown
. Lubiński
performed electro-oculogram(EOG) and full-field flash ERG evaluations in patients diagnosed with NF1 and variable ocular manifestations including optic nerve gliomas (<5%), and compared results to normal HC. These authors reported a significative increase in the Arden indexes of the EOG test in NF1 patients, whereas there were no recorded abnormalities in the flash ERG examination. The reported EOG changes were attributed to calcium level variations caused by melanin abnormalities related to reduced expression of neurofibromin
.
To our knowledge, this is the first study evaluating neuroretinal function in NF1 patients in the absence of OPGs.
Moreover, the NF1 group presented a high percentage of chorioretinal alterations consisting of choroidal nodules when compared to HCs.
The exact origin of the P1 wave is still debated. There is evidence that the same cellular elements that contribute to the full field ERG b-wave formation could be the source of the P1 wave. The major contribution may derive from the depolarization of bipolar cells activated by a light source,therefore, it is believed that the b-wave is generated by cells in the inner retina
.
There are studies showing that NF1 RGCs exhibit shortened neurite length and reduced growth cone areas, with decreased survival in response to different types of injury compared to wild-type counterparts. These defective neuronal phenotypes have been suggested to reflect an abnormal neurofibrominmediated cyclic adenosine monophosphate (cAMP) generation
.CAMP is a derivative of adenosine triphosphate (ATP) and serves as second messenger for intracellular signal transduction.Recently, it has been found that changes in cAMP levels have regulatory influences on the phototransduction cascade.This action exerts expanding the adaptation contingent of photoreceptors to illumination conditions, decreasing its sensitivity in bright light and increasing its sensitivity during the dark part of the day
.
Neurofibromin is a positive regulator of cAMP levels in various cell types including neurons, and its deficit leads to a reduction in cAMP basal levels
. Therefore, we hypothesize that the lower levels of mfERG P1 wave amplitude in NF1 patients found in our study may be attributable to an altered intracellular signal transduction due to abnormal neurofibromin-mediated cAMP generation.
The eye and ocular adnexa are frequently involved in NF1.Some ocular manifestations of NF1 including optic pathway gliomas (OPGs), iris Lisch nodules, orbital and eyelid neurofibromas, eyelid café-au-lait spots, are diagnostic of the disease, whereas additional, recently described ocular features and are not currently diagnostic for NF1 and include choroidal nodules, retinal microvascular abnormalities, and hyperpigmented spots of the fundus oculi
.The presence of electrophysiological changes in NF1 was previously investigated on visual evoked potentials (VEPs) in patients with related OPGs. Notably, abnormal visual evoked responses allowed for early detection of optic gliomas in NF1 and earlier intervention prior to significant visual loss
.
This hypothesis provides a possible biological explanation of the electrofunctional results obtained.
In our study, we identified electro functional disorders in NF1 patients consisting of P1 wave alterations. Specifically, NF1 patients showed a statistically significant reduction in the mfERG P1 wave amplitude in the 4 quadrants when compared to HC, with no recorded differences of the P1 wave amplitude in the 2 central degrees between the groups. These alterations were subclinical as the recruited patients all presented with normal or corrected to normal visual acuity and no underlying disease that could affect retinal function. Moreover, the absence of ERG alterations in the 2 central retinal degrees,corresponding to the fovea centralis, reflected the absence of visual impairment in our patients.
Variable in number and morphology, mostly located at the posterior pole, choroidal nodules are a frequent manifestation of ocular involvement in NF1 patients
. These lesions represent amounts of proliferating Schwann cells, melanocytes and ganglion cells around axons of the ciliary nerves innervating the choroid
. They appear as hyperreflectivewhitish lesions at SD-OCT in NIR modality, with variable features from well-defined to dull, confluent margins,according to previous evidence
. A few authors described a thinning of the overlying retinal tissue in correspondence of choroidal nodules in NF1, expression of sub-atrophy of retinal layers
. More recently, low flow areas overlying choroidal nodules were demonstrated at the level of choriocapillaris on OCT-angiography in a single-case report, showing topographical matching with areas of reduced chorioretinal thickness
. However, we are currently unable to establish any correlation between the impairment of retinal function and the presence of choroidal nodules. Further investigation aimed at evaluating choroidal nodules-related low flow to the retina and corresponding retinal functional alterations detected by the use of mfERG is encouraged.
3.2 無菌操作 操作中必須樹立牢固的無菌觀念,嚴(yán)格執(zhí)行無菌操作技術(shù)。頭部毛發(fā)較多,毛囊內(nèi)容易滋生細(xì)菌,因此穿刺前必須仔細(xì)備皮,認(rèn)真清潔皮膚,嚴(yán)格消毒,保證足夠面積的無菌區(qū),至少為10 cm×10 cm。剃頭發(fā)時(shí)動(dòng)作輕柔,避免剃破皮膚,引起感染。
Additional findings from our study consisted in significative differences in the mfERG P1 wave amplitudes in the 4 quadrants within the NF1 group, with lower amplitudes detected in the nasal quadrants.
In HCs, we observed similar differences regarding amplitude values with lower values registered in the supero-nasal quadrant if compared to temporal quadrants (SN
ST; SN
IT; Table 2).
These results are in agreement with previous evidence
,showing that lower values of amplitudes in the nasal quadrants appear to be physiological in multifocal evaluation.
This may explain why, although significantly reduced amplitudes are detectable in each quadrant of the mfERG evaluation in NF1 patients compared to HCs, the amplitudes in the nasal quadrants appear to be the most affected in both groups.
The clinical significance of the recorded electro-functional abnormalities in NF1 patients remains unclear. Prospective studies are needed to evaluate long-term responses in patients with NF1 and potential correlation with progressive visual impairment. In summary, mfERG evaluation in patients affected by NF1 showed a decreased amplitude of the P1 wave between 2 and 25 central retinal degrees attributable to retinal function impairment. This abnormality is subclinical as all patients did not have a reduced visual acuity nor had any underlying disease that could have affected the outcome of the research. These observations suggest a possible use of mfERG as subclinical retinal damage indicator with a potential utility in clinical practice for the follow-up of NF1 patients.
項(xiàng)目名稱:海南市三亞老干部休養(yǎng)所建筑設(shè)計(jì):美國丹尼爾連設(shè)計(jì)事務(wù)所建筑施工:上海韓進(jìn)建筑有限公司項(xiàng)目所在地:海南
Study conception and design:Moramarco A, Nebbioso M. Acquisition of data: Moramarco A,Lucchino L, Nebbioso M. Analysis and interpretation of data:Moramarco A, Nebbioso M, Lucchino L, Roberti V. Drafting of manuscript: Lucchino L, Mallone F, Marcelli M, Nebbioso M,Alisi L. Critical revision: Moramarco A, Giustini S, Nebbioso M,Lambiase A.
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International Journal of Ophthalmology2022年5期