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Search Results: 1 - 10 of 32984 matches for " HU Na’aya "
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A clinicopathological study of Dermatofibrosarcoma Protuberans in Maiduguri, Northeastern Nigeria
HA Nggada, BM Gali, HU Naaya
Nigerian Journal of Surgical Research , 2006,
Abstract: Background Dermatofibrosarcoma protuberans (dfsp) is a rare tumour originating from the dermis, it is slow growing, nodular, polypoid neoplasm that invade the subcutaneous tissue and does not usually metastasis.Clinical presentation is not uniform and may mimic common tropical benign skin lesions.We intend to study the behaviour of this tumour in our environment . Materails and method. A Clinicopathologic study of 36 cases of histologically diagnosed Dermatofibrosarcoma protuberans in University Maiduguri Teaching Hospital was carried out.DFSP constitutes 3.05% of all cases of all cancers and 10.2 % of all skin cancers. The peak age incidence was the 4th and 6th decades with a median age 37.6 years. The males to female ratio was 2:1. The commonest site was the trunk 17(48.8%), followed by the lower limbs 8 (22.9%); upper limbs 6(17.1%); head and neck 3(8.6%) and buttock 1(2.9%) were not frequently affected.. Conclsusion: DFSP is a common lesion in our environment that warrants proper clinical assessment, and histological characterisation.
Parasitic twins - A case report from the University of Maiduguri Teaching Hospital
HU Naaya, AM Lawan, AI Gadams
Nigerian Journal of Paediatrics , 2005,
Abstract:
Pyomyositis in north - eastern Nigeria: a 10-year review
AG Madziga, UH Naaya, BM Gali
Nigerian Journal of Surgical Research , 2004,
Abstract: Background: Pyomyositis is a suppurative disease of skeletal Muscle and a well-known disease with frequent occurrence in the tropics and subtropics, which continues to cause significant morbidity. Despite several studies of the disease in various regions of the tropics, there has been none from the northeast region of Nigeria, consisting of a largely rural population where the climate is hot and dry with little annual rainfall. Methods: A retrospective study of all patients seen and treated for pyomyositis in the University of Maiduguri Teaching Hospital from April 1990 to April 2000 was undertaken. Results: Fifty four patients with pyomyositis were seen and managed comprising 36 Males and 18 Females (M: F ratio 2:1). Two peak age incidences of 6-10 years and 31-40 years were noted. Most were from a labouring population and presented with a fully evolved disease affecting the large and powerful muscles of the thigh and calf in 59.7% of cases, the glutei in 12.9% and the trunk in 9.7%. The smaller muscles of the arm and forearm and head and neck were rarely affected. 8 patients had multiple lesions. Staphylococcus aureus was cultured in 91.8% of cases sensitive to cloxacillin, augmentin, chloramphenicol and erythromycin in that order. Conclusion: Prompt diagnosis, appropriate supportive therapy, effective antibiotic therapy and early drainage of abscesses have resulted in minimal mortality despite late presentation although hospital stay was prolonged.
A PTS Optimization Scheme with Superimposed Training for PAPR Reduction in OFDM System  [PDF]
Renze Luo, Rui Li, Xiaoqiong Wu, Shuainan Hu, Na Niu
Communications and Network (CN) , 2014, DOI: 10.4236/cn.2014.62012
Abstract:

Partial Transmit Sequences (PTS) is an efficient scheme for Peak-to-Average Power Ratio (PAPR) reduction in Orthogonal Frequency Division Multiplexing (OFDM) system. It does not bring any signal distortion. However, its remarkable drawback is the high computational complexity. In order to reduce the computational complexity, currently many PTS methods have been proposed but with the cost of the loss of PAPR performance of the system. In this paper, we introduce an improved PTS optimization method with superimposed training. Simulation results show that, compared with conventional PTS, improved PTS scheme can achieve better PAPR performance while be implemented with lower computation complexity of the system.

Evaluation of Magnetic Resonance Imaging Findings and Short-Term Outcome in Brain Metastatic Tumors after CyberKnife Treatment  [PDF]
Jiashou Hu, Hongzi Tian, Na Guo, Di Wang, Jinfeng Sun
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2016, DOI: 10.4236/ijmpcero.2016.51010
Abstract: Objective: To evaluate the treatments’ outcomes in brain metastatic tumors after CyberKnife treatment according to magnetic resonance imaging (MRI) findings and improvement of symptoms. Methods: A retrospective analysis of CyberKnife treatment; 63 cases of patients with brain metastases; the use of CyberKnife treatment; short-term outcome evaluation after treatment and the MRI findings and measured before treatment and underwent diffusion-weighted imaging MRI scan of apparent diffusion coefficient (ADC) values. Results: 3 months after CyberKnife treatment and effectiveness were 82.5% and 96.8% respectively; 6 months and one year survival rates were 82.5% and 55.6% respectively; the median survival time was 16 months. MRI of 52 patients (67 lesions) ADC values after treatment increased to some extent than before treatment. There are 38 lesions volume to shrink or disappear, no enhancement or slight enhancement in the lesion, no edema zone; 27 lesions does not change in volume, no edema (18 lesions significantly weakened the degree of enhancement; 6 lesions showed no obvious change enhancement; 3 lesions showed ring enhancement, internal cystic); 2 lesions volume were larger, heterogeneous enhancement, peripheral edema. Conclusion: CyberKnife is an effective method for treating brain metastatic tumor. MRI can accurately evaluate tumor lesions after treatment.
Management of adult incisional hernias at the University of Maiduguri teaching hospital.
B M Gali, A C Madziga, H U Na'aya, T Yawe
Nigerian Journal of Clinical Practice , 2007,
Abstract: Background: Incisional hernias (IH) represent a breakdown or loss of continuity of a fascial closure. They are thus unique as the only external wall hernias that are iatrogenic in aetiology. Incisional hernias are not uncommon complications of laparotomy closure with reported incidence of 2 to 11%. Objectives: To review our experience,with incisional hernaia identify possible risk factors and proffer preventable strategies. Patients and methods: All case records of adult patients managed with IH at the University of Maiduguri Teaching Hospital between January 1995 and December 2004 were retrieved from the Medical Records Department. Relevant data on age, sex, type and institution of index surgery (General Hospital or Private Hospital), premorbid factors, type of repair, post-operative complications were extracted. Case records with inadequate information were excluded. Results: Between January 1995 and December 2004 a total of 440 patients with external abdominal hernias were treated at UMTH. Out of these: 38 (11.6%) were Incisional hernias and form the basis of this study. Their ages ranged between 18 and 80 years, with peak age range of 40-49 years. There were 6 males and 32 females giving a male to female ratio of 1:5.3. The commonest index surgeries were caesarean section in 12 patients (31.6%) and appendicectomy 10 patients ( 26.3%). Of the index surgeries 26 (68.4) and 10 (26.3) were performed in general and private hospitals respectively. Only 2(5.3%) were done at UMTH. Wound sepsis, in 18patients ( 47.4%), postoperative cough, 8 ( 21.1%) and obesity 6 ( 15.8%) were the commonest risk factors. Poor surgical technique was found in 36 patients (94.7%) Most of the patients presented late; 8(21.1%) with recurrence and 6(15.8%) were giant in size. All but one were successfully repaired. Only one (2.3%) had recurrence. There was no mortality. Conclusions: Incisional hernias are not uncommon constituting 11.6% of all adult external abdominal wall hernias repaired at UMTH. Most of the causes are preventable with 94.7% of the index surgery done at peripheral hospitals where poor surgical technique was common to all. There is urgent need to re-train our general duty doctors on proper surgical techniques of abdominal wound closure.
Noninvasive Blood Glucose Monitoring System Based on Distributed Multi-Sensors Information Fusion of Multi-Wavelength NIR  [PDF]
Bo Zeng, Wei Wang, Na Wang, Funing Li, Fulong Zhai, Lintao Hu
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B114
Abstract:

In this research, a near infrared multi-wavelength noninvasive blood glucose monitoring system with distributed laser multi-sensors is applied to monitor human blood glucose concentration. In order to improve the monitoring accuracy, a multi-sensors information fusion model based on Back Propagation Artificial Neural Network is proposed. The Root- Mean-Square Error of Prediction for noninvasive blood glucose measurement is 0.088mmol/L, and the correlation coefficient is 0.94. The noninvasive blood glucose monitoring system based on distributed multi-sensors information fusion of multi-wavelength NIR is proved to be of great efficient. And the new proposed idea of measurement based on distri- buted multi-sensors, shows better prediction accuracy.

Topological properties of the FQH quasiparticles from the entanglement entropy
Na Jiang,Zi-Xiang Hu
Physics , 2015,
Abstract: The topological entanglement entropy is a robust measurement of the quantum many-body state with topological order. In fractional quantum Hall (FQH) state, it has a connection to the quantum dimension of the state itself and its quasihole excitations from the conformal field theory (CFT) description. We systematically study the entanglement entropy in the Laughlin, Moore-Read, and Read-Rezayi FQH states. The Abelian nature of the quasihole manifests in the invariant of the entanglement entropy and spectrum while it is created in the subsystem. Whereas the non-Abelian quasihole excitation induces an extra correction of the topological entanglement entropy and the changing of the structure of the entanglement spectrum. The quantum dimension of the quasihole can be obtained from the entropy difference before and after inserting the quasihole. On the other hand, the entanglement entropy behaviors similarly to the density profile and has less oscillations far away from the center of quasihole. It gives us a better definition of the quasihole boundary and the measurement of the size of the quasihole.
Abelian regular coverings of the quaternion hypermap
Na-Er Wang,Kan Hu
Mathematics , 2015,
Abstract: A hypermap is an embedding of a connected hypergraph into an orientable closed surface. A covering between hypermaps is a homomorphism between the embedded hypergraphs which extends to an orientation-preserving covering of the supporting surfaces. A covering of a hypermap onto itself is an automorphism, and a hypermap is regular if its automorphism group acts transitively on the brins. Depending on the algebraic theory of regular hypermaps and hypermap operations, the abelian regular coverings over the quaternion hypermap are investigated. We define normalized multicyclic coverings between regular hypermaps, generalizing almost totally branched coverings studied in [K. Hu, R. Nedela, N.-E Wang, Branched cyclic regular coverings over platonic maps, European J. Combin. 36 (2014) 531--549]. It is shown that the covering transformation group of a normalized multicyclic covering is a nilpotent group with bounded class. As an application the abelian normalized bicyclic coverings over the quaternion hypemap are classified. In particular, those coverings which possess various level of external symmetry or fulfil certain smoothness conditions are explicitly determined.
STAT3 or USF2 Contributes to HIF Target Gene Specificity
Matthew R. Pawlus, Liyi Wang, Aya Murakami, Guanhai Dai, Cheng-Jun Hu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0072358
Abstract: The HIF1- and HIF2-mediated transcriptional responses play critical roles in solid tumor progression. Despite significant similarities, including their binding to promoters of both HIF1 and HIF2 target genes, HIF1 and HIF2 proteins activate unique subsets of target genes under hypoxia. The mechanism for HIF target gene specificity has remained unclear. Using siRNA or inhibitor, we previously reported that STAT3 or USF2 is specifically required for activation of endogenous HIF1 or HIF2 target genes. In this study, using reporter gene assays and chromatin immuno-precipitation, we find that STAT3 or USF2 exhibits specific binding to the promoters of HIF1 or HIF2 target genes respectively even when over-expressed. Functionally, HIF1α interacts with STAT3 to activate HIF1 target gene promoters in a HIF1α HLH/PAS and N-TAD dependent manner while HIF2α interacts with USF2 to activate HIF2 target gene promoters in a HIF2α N-TAD dependent manner. Physically, HIF1α HLH and PAS domains are required for its interaction with STAT3 while both N- and C-TADs of HIF2α are involved in physical interaction with USF2. Importantly, addition of functional USF2 binding sites into a HIF1 target gene promoter increases the basal activity of the promoter as well as its response to HIF2+USF2 activation while replacing HIF binding site with HBS from a HIF2 target gene does not change the specificity of the reporter gene. Importantly, RNA Pol II on HIF1 or HIF2 target genes is primarily associated with HIF1α or HIF2α in a STAT3 or USF2 dependent manner. Thus, we demonstrate here for the first time that HIF target gene specificity is achieved by HIF transcription partners that are required for HIF target gene activation, exhibit specific binding to the promoters of HIF1 or HIF2 target genes and selectively interact with HIF1α or HIF2α protein.
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