Dielectric properties of a liquid crystalline siloxane copolymer

An investigation on the molecular dynamics of a liquid crystalline side chain polymer using the dielectric relaxation method on oriented samples in the frequency range of 0,1 to 10 000 kHz is presented. The compound under investigation is a polysiloxane copolymer with two different mesogenic side chains and a phase sequence glassy-smectic A-nematic-isotropic. Three main relaxation processes are found and assigned to the rotation of the side chains around the main chain, the glass transition process coupled with side chain motions, and a local motion in the glassy state, respectively. Evidence is found for a layered arrangement of the polymer main chain in the smectic phase and for a parallel correlation between the transverse components of the dipole moments.     

Severe calcification in left main stem coronary artery stenosis visible on routine chest radiograph

Coronary calcification is a strong predictor of significant coronary stenosis in symptomatic patients. While discrete calcification within coronary arteries is only detected by sensitive methods such as computed tomography, severe calcification can already be seen on the plain chest radiograph. In this article, we describe a patient with a high grade left main stem coronary artery stenosis who presented with a severe focal calcification on the plain chest radiograph in projection of the offspring of the left coronary artery.     

TCRVβ7.1基因修饰T细胞对乳腺癌细胞杀伤作用的研究

目的：观察TCPVβ7．1基因转染前后正常人外周血淋巴细胞对乳腺癌细胞株杀伤活性的影响。方法：脂质体包裹PdWA3.1vβ7.1后转染健康人PBMC，流式细胞仪检测PdWA3.1Vβ7.1基因表达，改良MIT法检测TCRVβ7．1基因转染前后正常人外周血淋巴细胞对乳腺癌细胞株杀伤活性。结果：TCRVβ7．1基因转染可显著增加正常人PBMC该基因表达，转染前后正常人外周血淋巴细胞对乳腺癌细胞株杀伤活性有显著性差异。结论：用TCR基因修饰可明显提高正常人PBMC对乳腺癌细胞杀伤作用。     

Segmentation of Bacteria Image Based on Level Set Method

In biology ferment engineering, accurate statistics of the quantity of bacteria is one of the most important subjects. In this paper, the quantity of bacteria which was observed traditionally manuauy can be detected automatically. Image acquisition and processing system is designed to accomplish image preprocessing, image segmentation and statistics of the quantity of bacteria. Segmentation of bacteria images is successfully realized by means of a region-based level set method and then the quantity of bacteria is computed precisely, which plays an important role in optimizing the growth conditions of bacteria.     

纳洛酮抢救海洛因中毒618例临床分析

目的：观察纳洛酮抢救海洛因中毒的疗效。方法：对618例海洛因中毒患,用纳洛酮抢救,首次剂量给纳洛酮针剂0．4－0．8mg静注,然后以0．4mg每5min1次,直到患清醒后再给0．8－1．2mg维持静滴。结果：618例中死亡9例,抢救成功率达98％。结论：纳洛酮是抢救海洛因中毒的理想特效药。     

基于互严格凹函数测度的医学图像配准新方法

为了提高医学图像配准的运算速度和增大配准的稳定区域，提出用严格凹函数取代互信息中的香农熵函数的方法，形成了互严格凹函数测度（NMi，i=1，2，…，6）。互信息只是互严格凹函数测度的一个特例。并提出一种新的判断配准好坏的标准——稳定区域和稳定区域宽度。通过试验比较得NM2、NM4、NM5互严格凹函数测度比互信息好，比Ⅰ0.2和R0.2测度更好，即这三个测度的配准时间比互信息少，比Ⅰ0.2和R0.2测度更少；三个测度配准的平均稳定区域宽度比互信息宽，比Ⅰ0.2和R0.2测度更宽。最后用NM2测度进行多模态医学图像的非刚体配准试验，结果表明效果良好。     

Immunological characterization and localization of the Na+/Ca2(+)-exchanger in bovine retina

The sodium/calcium exchanger was purified from bovine retinal rod outer segment membranes and used for the immunization of New Zealand White rabbits. A polyclonal antibody was produced which was found to bind specifically to the 230 kDa Na+/Ca2(+)-exchanger protein as assessed by Western blotting. The antibody did not bind to the high-molecular-weight "rim protein," thereby demonstrating that this protein is distinct from the rod outer segment of Na+/Ca2(+)-exchanger. We used the polyclonal antibody for immunohistochemically localizing the exchange protein in bovine retina. Fluorescent light microscopy revealed intensive immunolabeling of the photoreceptor outer segments, whereas other retinal cell layers exhibited minimal binding. Using the electron microscopic immunogold method, we found specific antibody binding to the extracellular side of rod outer segment plasma membrane. Rod disk membranes, rod inner segments, and cone photoreceptors displayed no significant labeling. We therefore conclude that the Na+/Ca2(+)-exchanger is localized primarily in the rod outer segment plasma membrane, the most appropriate localization considering its proposed role in the process of vertebrate phototransduction.     

Palliative chemo-radiotherapy with ifosfamide and epirubicin as first-line treatment for high-risk metastatic breast cancer Results of a prospective multicenter trial

From June 1986 to December 1988, 107 patients (median age, 49 years; median performance score, 1) with haematogeneous metastases from breast carcinoma were treated with concomitant radiation and chemotherapy. Overall, 97% of the patients had been pretreated with surgery; 65%, with radiation; and 56%, with hormones. In all, 38% had received adjuvant chemotherapy. Patients with prior palliative chemotherapy were excluded from the study. All patients fulfilled at least two high-risk criteria. Chemotherapy was given according to the EI protocol (4-epirubicin and ifosfamide), and all patients simultaneously received radiation to the main tumor sites. Gastro-intestinal toxicity was moderate (11.1%, WHO grade 4), and bone marrow depression was marked in all cases. After three treatment courses, the overall response rate was 67% [21% complete response (CR), 46% partial response (PR)]. In all, 28% had stable disease (NC) and the rate of progressive disease (PD) was 5%. The median duration of tumour response was 8 months, with 12 months for CRs, 9 months for PRs and 6 months for NCs. The median survival was 13.5 months.Presented at the Satellite Symposium Ifosfamide in Gynecological Tumors of the 5th European Conference on Clinical Oncology and Cancer Nursing', London, September 3–7, 1989     

小儿尿道狭窄的治疗

目的：探讨小儿尿道狭窄的治疗方法。方法：10例行尿道成形术,6例行尿道扩张术后留置导尿管,4例行尿道会师术。结果：6例术后排尿正常,均为行尿道成形术者,8例出院后尿道扩张2－3个月后排尿正常,4例需定期行尿道扩张。结论：尿道成形术治疗小儿尿道狭窄疗效确切。     

声门型喉癌T_3病变喉部分切除术后疗效评价

目的　探讨喉部分切除术对声门型喉癌T3 病变的可行性及修复材料的选择。方法　对 1986年 1月～ 1994年 1月 78例行喉部分切除术的声门型喉癌T3 病变患者的术式及修复方法进行了回顾性分析。结果　患者 3年、5年生存率分别为 88 5 %、75 6 % ,局部复发率 15 4%。应用了梨状窝粘膜 甲状软骨板外侧软骨膜、会厌软骨瓣及带状肌双肌双蒂瓣 3种方法修复创面 ,均获得了较好的喉功能恢复。结论　喉部分切除术是根治声门型喉癌T3 病变合理、有效的方式 ,但不能完全替代全喉切除术 ,应根据切除范围选择合理的修复方式。