尼龙1010／6及尼龙1010／66动态力学分析

通过动态力学参数温度谱,研究了尼龙１０１０／６、尼龙１０１０／６６两个共聚物系列的动态力学参数与组成的关系。研究表明尼龙１０１０／６、尼龙１０１０／６６在测试温度范围内出现三个明显的松驰转变：α、β、γ,其中各共聚物的β、γ松驰温度相差不大,而α松驰温度随组成改变有明显改变。一般均聚物的α松驰温度较高,共聚物的α松驰温度均低于均聚物,二个系列以尼龙１０１０／６（２９．８／７０．２）、尼龙１０１０／     

Giant inguinal scrotal vesical hernia

Presentation of one case of scrotal hernia in a man of 64 years old patient. Diagnosed by cistography and ultrasound and treated by herniorraphy and posterior transuretral litolaplaxy of a vesical litiasis and RTU of prostate. Postoperative urography showed normal vesical morphology.     

Variations in the survival probabilities of the PVC-protected red mangrove propagules: testing the encased replanting technique

The EcoEléctrica Mangrove Planting Project, a five-year voluntary effort, has the purpose of testing a recently developed mangrove planting technique at the EcoEléctrica site in Pe?uelas, Puerto Rico. The goal of the project is to provide empirical validation to promote or improve the technique to be used in recovering mangrove ecosystems in Puerto Rico and United States. The research presented herein analyzed the information collected on the first two years of the project. The proportions of remaining casings and seeds per study zone were compared using the chi-square distribution. Zone 1 had the least pipes lost while Zone 4 had the most (p < 0.05). Forty-three percent of the seeds in Zone 1 remained in the casing, while 26% remained in Zone 2 (p = 0.03). Median growth rates of seeds per study zone showed that Zone 1 had the highest median growth rates. Survival analysis described the survival experience of the seeds, and differences in survival probabilities were compared with the log-rank test. Zone 1 seeds had a better survival experience compared to Zones 2, 3 and 4 (p < 0.0001). Survival probabilities for being free of spots were over 60% during the whole study period. No significant differences were observed in the survival experience with the use-or-no use of casing extensions (p = 0.40), and the use-or-no use of nursed seeds (p = 0.26). Differences in survival probabilities might be attributed to variations in wave energy, depth or substrate conditions. This hypothesis will be evaluated in the second phase of the study.     

Health status and functional limitations in the elderly population of the University Region of Health of Puerto Rico: methodologic aspects and prevalence estimates

In order to plan the health services for the elderly population, it is necessary to quantify their health status and their functional capacity. In Puerto Rico, few epidemiological studies have been conducted regarding functional capacity and chronic diseases in the elderly population. One of the difficulties to undertake these studies is the high cost and risks to move this population for clinical exams, in addition to the methodology limitation of self-report in the elderly population. This study shows the use of logistic regression to estimate the prevalence of chronic diseases and functional capacity, when the observed data are not consisted with the planed sampling scheme. Four hundred and eighty-seven elderly persons (65 yr. and over) were interviewed in the municipalities of Canóvanas, Carolina, Loíza and Trujillo Alto in Puerto Rico, using a cross-sectional design. More than half of the elderly had visual problems (IC 95%: 54.8%, 63.8%), arthritis (IC 95%: 52.7%, 61.5%) and hypertension (IC 95%: 47.3%, 56.3%). In the case of hypertension, significant differences (p < 0.05) by sex were observed, where women reported a higher prevalence than men. One of the higher prevalences in the functional capacity status was with urine accidents. More than one-third of the population is estimated to have this problem (IC 95%: 34.7%, 43.4%). One-fourth of the population had limitations with going out for shopping (IC 95%: 23.9%, 31.9%) and using public and private transportation (IC 95%: 19.5%, 26.9%). We conclude that the applied methodology was consistent with the estimation presented in the literature and statistics from the Puerto Rico Health Department. However, it is necessary to continue assessing the design and analytical methodology, in order to undertake consistent and periodic evaluations of the elderly population.     

原发性脑室出血的CT征象与治疗（附28例报告）

目的探讨原发性脑室出血的临床表现、脑CT征象及其与治疗的关系;方法回顾性分析28例经CT证实原发性脑室出血病人的临床表现及CT征象;结果多有头痛、呕吐等脑膜刺激征表现,无脑局灶受损体征,脑CT均示原发脑室出血;结论原发性脑室出血的诊断依靠脑CT,Ⅰ型脑室出血宜行侧脑室外引流术,预后较差,Ⅱ、Ⅵ型可行腰穿脑脊液置换术．预后较好。     

Growth of vascularized composite mandibular allografts in young rabbits

Forty-one hemimandible allografts were transplanted in young rabbits immunosuppressed with cyclosporine. The majority of the grafts demonstrated normal wound healing, and growth of hair, bone, and teeth. The mandibular body and the premolars showed significant growth in length. The allografted mandibles functioned sufficiently that the rabbits took oral nourishment soon after surgery. Long-term survival was limited by a toxic "wasting syndrome" specific for rabbits under treatment with cyclosporine.     

DRINKXNGf WATER AND LIVER CELL CANCER AN EPIDEMIOTJOGIC APPROACH TO THE ETIOLOGY OF THIS DISEASE, IN CHINA

The geographical distribution of liver cell tancer in China is very uneven. The areas of high frequenCY arc rcstrieted to the coastal zones in :fiangsu Province and southwards of this area and the Guangxi Autonomous Region. The data are mainly collected from LI counties (Qidong, Haimen, Nantong and Rudang) of Jiangsu Province. For many years the bortler 1incs of the high rate areas have remained un- changed. The method of study employed is primarily comparing the environmental factors of adiacent areas with significantly different rates of liver cell cancer, comparing the liver cancer death rates of same area inhabitants using different kinds of drinking water and ob- serving changes in Iiver cancer incidence in vil- 1agers befom and after changing the fype of drinking water. Inhabitauts who drink stagnant and highly polluted ditch water usually incur a higher pre- valence rate while those who drink weii water seldom contract liver cancer. In a sample study, more than 80,000 inhabitants, who were survey- ed twice in 1973 and in 1078 showed a reductiou of approximately 2{JTo in liver cancer incidence in the 5 year interval between surveys, while the propartion of ditch watcr drinkers was re- duced from 79T" in the first survey t0 5;IW,o in the seeand, a reduction of approximately 3270. If all the inhabitants ceased drinking ditch ivater the menace of liver cancer could be wipcd out in Qidong county. It seems that neither hepatitis nor aflatoxin can be considercd as an important causative Factor of liver cell cancer iu China.     

The HSV 1 genome in quiescently infected NGF differentiated PC12 cells can not be stimulated by HSV superinfection

This study reports that quiescent herpes simplex virus (HSV) type 1 genomes, persisting in long-term infected nerve growth factor (NGF) differentiated PC12 cells, were not stimulated by superinfection with a HSV-1. We have previously shown that HSV-1 can establish long term, quiescent infections in NGF differentiated PC12 cells. To determine if virion associated factors or virus induced gene products could trans-activate the quiescent viral genomes, long term infected PC12 cell cultures were superinfected at a high moi (moi of 20) with a recombinant HSV 17alpha47/lacZ that contains the lacZ gene within the alpha 47 locus. Progeny virus and gene expression from the resident 'quiescent' viral genomes were not detected following superinfection with recombinant 17alpha47/lacZ. The failure to stimulate the quiescent genome appears to be related to the inability of the super infecting virus to induce any gene expression from its own genome following entry into the long term NGF treated PC12 cells. Interestingly, both primary and superinfecting viruses could be stimulated from the quiescently infected cultures following cocultivation with inducer cells. These data suggest that (i) HSV genomes in quiescently infected PC12 cells are unable to be stimulated by incoming virion associated factors and (ii) NGF differentiated PC12 cells maintained in tissue culture for longer than 3 weeks became completely refractory to viral gene expression. The possibilities that these results are reflective of populations of neural cells, in vivo in mouse central nervous system, which are completely refractory to virus gene expression, yet accommodating to the maintenance of viral genomes and thus favor 'latency', are discussed.