Photochemical reaction of particle-bound 1-nitropyrene under simulated atmospheric condition

Photoreaction of particle-bound 1-nitropyrehe (1-NP) under simulated atmospheric condition has been studied. When 1-NP coated on the surface of silica gel was suspended in a stream of nitrogen, oxygen or air, respectively, and exposed to intensive light of xenon lamp, photochemical reaction took place. The result of kinetic study showed it to be of the second order. The photoreaction products were identified by off-line HPLC/MS as 1,6-pyrenequinone, 1,8-pyrenequinone, trinitro-hydroxypyrene, dinitrohydroxypyrene, 6,6'- dipyrenenone, etc. The mutagenicity of photochemical reaction products is higher in oxygen and air, and lower in nitrogen than that of the precursor 1-NP, as detected by the Ames Bioassay.     

Prenatal diagnosis of alpha-1-antitrypsin deficiency by PCR of linked polymorphisms: A study of 17 cases

We describe our experiences of prenatal diagnosis of alpha-1-antitrypsin deficiency using closely linked polymorphisms detected by Southern blotting and the polymerase chain reaction. Prenatal diagnosis was carried out for 17 pregnancies from 15 couples.     

Purification of AS-CMP effluent by combined photosynthetic bacteria and coagulation treatment

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｐｕｌｐａｎｄｐａｐｅｒｉｎｄｕｓｔｒｙｉｓａｍａｊｏｒｃｏｎｔｒｉｂｕｔｏｒｔｏｗａｔｅｒｐｏｌｌｕｔｉｏｎｉｎＣｈｉｎａ.Ｉｎ1995,ｔｈｅｗａｓｔｅｗａｔｅｒｄｉｓｃｈａｒｇｅｄｂｙｐｕｌｐａｎｄｐａｐｅｒｉｎｄｕｓｔ...     

A three-dimensional model for the transportation of Fe and Mn in Arha Reservoir

ＩｎｔｒｏｄｕｃｔｉｏｎＡｒｈａＲｅｓｅｒｖｏｉｒｉｓｌｏｃａｔｅｄｉｎｔｈｅｐｌａｔｅａｕｒｅｇｉｏｎｏｆＳｏｕｔｈｗｅｓｔＣｈｉｎａ.Ｔｈｉｓｒｅｓｅｒｖｏｉｒ,ｗｉｔｈａｖｏｌｕｍｅｏｆ445ｍｉｌｌｉｏｎｍ3,ｗａｓｂｕｉｌｔｉｎ1960ａｎｄｉｓｔｈ?..     

Variation in the levels of pregnancy- specific β-1-glycoprotein in maternal serum from chromosomally abnormal pregnancies

Human pregnancy-specific β-1-glycoprotein (SP1) was assayed retrospectively in stored maternal serum (MS) samples from 82 chromosomally abnormal pregnancies and 377 matched controls. The median MSSP1 concentration in 48 Down's syndrome pregnancies was significantly elevated at 1.17 multiples of the control median (MOM), and significantly reduced (0.5 MOM) in a group of eight cases of unbalanced translocations. There was no significant difference in median SP1 concentrations in cases of trisomy 18, trisomy 13, balanced translocations, or sex chromosome abnormalities. A comparison with human chorionic gonadotrophin results in the same series of samples indicates that SP1 is a less sensitive predictor of Down's syndrome pregnancies.     

Fumarylacetoacetase activity in cultured and non-cultured chorionic villus cells,and assay in two high-risk pregnancies

We describe further development of the fumarylacetoacetase (FAA) assay for the prenatal diagnosis of tyrosinaemia type 1 using chorionic villus sampling (CVS). We have established a reference range for FAA activity in cultured villus cells and have confirmed previously reported data on the FAA activity in uncultured chorionic villus cells. This should allow confirmation of results using CVS, without the need for further invasive procedures. We report the FAA enzyme stability at −70°C, +4°C, and at room temperature, and we have shown no obvious difference in enzyme activity with gestational age. We have analysed cultured and non-cultured CVS activity of FAA in two pregnancies at risk of tyrosinaemia type 1. In both, the fetus was designated unaffected, and these results were confirmed postnatally.     

带有残差修正的GIM(1)模型在工业固体废弃物排放量预测中的应用

基于灰色系统理论，研究和提出了带有残差修正的ＧＩＭ（１）模型，并给出了估计这种模型参数的简捷方法．实例表明，运用该方法得到的模型具有优良的预测精度，从而扩大了灰色预测方法在环境系统中的应用范围．     

Prenatal diagnosis of alpha-1-antitrypsin deficiency by fetal blood sampling

Fetal blood sampling for the diagnosis of alpha-1-antitrypsin deficiency using protein isoelectric focusing was carried out in the period 1980–1985. The results of 25 cases from 18 mothers are reported. All had a previous history of a PiZ child affected by liver disease. The method was found to be technically satisfactory and the fetal results were subsequently confirmed in all 18 cases where follow-up was possible. The fetus was found to be PiZ in nine cases and all these pregnancies were terminated. Of the remaining pregnancies three cases aborted or were delivered prematurely and 13 proceeded to term without complications.     

空气环境飘尘测定中的若干问题

空气环境超微飘尘颗粒，不能用一般光学方法测定，必须用X射线小角散射测定，在这种测定中，都认为测量角度越低就越准确，本文指出太低角区的散射光是由于颗粒间的干涉造成的，若不设法消除，会使测定结果偏大，甚至是错误的，同时由于不同粒度的颗粒会散射到不同的角区，所以又想用这个方法去测粒度的分布，这种做法会产生错误的结果，所以测定时应特别注意。     

Bioaugmentation: a new strategy for removal of recalcitrant compounds in wastewater—a case study of quinoline

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓｘｅｎｏｂｉｏｔｉｃｓｈａｖｅｃａｕｇｈｔｗｏｒｌｄｓａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｔｈｅｙａｒｅｐｏｏｒｌｙｂｉｏｄｅｇｒａｄａｂｌｅａｎｄｔｈｒｅａｔｅｎｐｕｂｌｉｃｈｅａｌｔｈｉｆｈａｎｄｌｅ...