宽频噪音对谷氨酸中毒损伤AD模型大鼠不同脑区NMDAR1(ζ1)、NMDAR2A(ε1)亚基表达的影响

目的:观察AD大鼠模型颞叶和额叶在98 dB宽频噪音暴露5 min后不同脑区NMDAR1(ζ1)、NMDAR2A(ε1) 表达的影响.方法: 采用Western Blot及 RT-PCR技术,结合ABR测定方法.结果:①AD模型组大鼠、空白对照组大鼠在98 dB宽频噪音暴露5 min后额叶、颞区、海马及小脑NMDAR1(ζ1)亚基表达无明显差异,但AD模型组表达明显弱于空白对照组;②生理盐水组加噪音后NMDAR1(ζ1)亚基小脑表达最强,颞叶最弱; NMDAR2A(ε1)表达最强为颞叶,海马最弱.③在海马三组大鼠NMDAR1(ζ1) 、NMDAR2A(ε 1)亚基表达有较明显的下调趋势;④空白对照组大鼠NMDAR1(ζ1)、NMDAR2A(ε1)亚基mRNA表达各区无差异.⑤AD模型组大鼠颞叶、海马NMDAR2A(ε1) 表达明显减弱 ,最弱为小脑,额叶次之.结论:噪音刺激抑制AD大鼠模型海马NMDAR1(ζ1)亚基表达,且不在mRNA水平.噪音刺激抑制AD模型大鼠颞叶、海马NMDAR2A(ε1) 亚基表达,且有部位差异,在mRNA水平已调节.     

调控RET依赖性GDNF信号通路对大鼠癫痫模型的影响

目的:探究双侧海马CA1区立体定向注射anti-GDNF抗体对匹鲁卡品诱导的大鼠癫痫模型的影响。方法:选择成年雄性SD大鼠60只,并随机分为3组,即假手术组(sham组,n=20)、癫痫模型组(model组,n=20)和GDNF抑制剂组(anti-GDNF组,n=20)。使用氯化锂-匹鲁卡品腹腔注射诱导癫痫模型,sham组只给予氯化锂,anti-GDNF组在造模前2 h给予大鼠双侧海马CA1区立体定向注射anti-GDNF抗体。在造模后1、3、7 d观察大鼠癫痫的发作频率,7 d后采用脑电图监测(EEG)测定脑电波的变化情况,通过免疫组化方法测定海马CA1区域神经元数量变化(Neu N表达水平),造模后1 d时使用western blot方法测定海马CA1区GDNF、RET和P53蛋白的表达。结果:Model组大鼠棘-慢波数量明显高于Sham组,anti-GDNF组以上指标较model组显著减少(P0.05);Model组海马CA1区神经元大量凋亡,但anti-GDNF组凋亡较model组显著减少(P0.05)。与Sham组比较,在癫痫发作后1 d,model组的GDNF、RET表达水平上调,P53表达水平下降(P0.05),而anti-GDNF组大鼠海马CA1区GDNF、RET表达较model组明显下调,P53表达水平显著上降(P0.05)。结论:双侧海马CA1区立体定向注射anti-GDNF抗体能够减少癫痫发作,并对海马神经元起到保护作用,可能与其抑制GDNF/RET/P53信号通路有关。     

丁苯酞对酒精依赖大鼠海马谷氨酸含量及NR2B表达的影响

目的:研究丁苯酞(NBP)对酒精依赖大鼠海马谷氨酸(Glu)含量和NNMDA受体2B亚基(NR2B)表达的影响。方法:建立酒精成瘾大鼠模型,观察戒断症状,SYBR Green I荧光实时定量PCR技术检测海马区NR2BmRNA表达,高效液相色谱法检测海马组织中谷氨酸含量。结果:模型组大鼠戒断评分比正常组明显上升(P<0.01),NBP中、高剂量组与模型组相比,戒断评分明显下降(P<0.05),差异均有显著性;模型组大鼠海马区谷氨酸含量较正常组显著降低(P<0.01),差异有显著性,而各用药组与模型组相比,海马区谷氨酸含量差异无显著性(P>0.05);实时定量PCR结果表明模型组大鼠海马区NR2BmRNA表达较正常组明显增加(P<0.05),而NBP中、高剂量组与模型组相比,海马区NR2BmRNA表达明显减少,差异有显著性(P<0.05)。结论:NBP能够减轻酒精依赖大鼠的戒断症状,可能与NBP抑制NR2BmRNA表达有关。     

五鹤续断总皂苷对AD大鼠学习记忆及海马Ach代谢的影响

目的:研究五鹤续断总皂苷对AD大鼠学习记忆能力的影响及其作用机制。方法:将40只大鼠随机分为空白对照组、模型组、五鹤续断组和阳性对照组(n=10),观察各组大鼠一般情况,以方形水迷宫评价大鼠的学习记忆能力,采用双抗体夹心法测定大鼠海马区乙酰胆碱酯酶(Ach E)和胆碱乙酰转移酶(Ch AT)的活性变化。结果:治疗过程中,模型组大鼠一般情况无明显变化,五鹤续断组和阳性对照组大鼠一般情况逐步改善,活动能力逐渐增强。与空白对照组比,模型组不同时间的游泳时间均明显延长,错误次数显著增多,海马区Ach E活性明显增强,Ch AT活性显著降低(P0.01);与模型组比,五鹤续断组和阳性对照组大鼠不同时间的游泳时间明显缩短,错误次数显著减少,海马区Ach E活性明显降低,Ch AT活性显著增强(P0.01);与阳性对照组比,五鹤续断组不同时间的游泳时间、错误次数和大鼠海马区Ach E和Ch AT活性无显著性差异。结论:五鹤续断总皂苷能够改善AD大鼠学习记忆能力,其作用机制可能与其调节海马区Ach代谢有关。     

孕期饮用酒精对子代大鼠学习记忆及海马cdk5表达的影响

目的:研究孕期饮用酒精对子代大鼠学习记忆及海马细胞周期依赖性蛋白激酶5(cdk5)表达的影响。方法:建立大鼠孕期饮用酒精模型,子代成年后,Y-型迷宫测试学习记忆成绩;聚合酶链式反应(RT-PCR)分析海马组织cdk5mRNA的表达;免疫荧光法检测子鼠海马区cdk5蛋白表达。结果:学习记忆测试结果显示孕期饮用酒精组子鼠学习记忆成绩比正常对照组和饮酒对照组明显下降;RT-PCR结果表明孕期饮用酒精组子鼠海马组织cdk5mRNA表达较正常对照组和饮酒对照组明显上升;免疫荧光结果显示孕期饮用酒精组子鼠海马区cdk5蛋白表达明显增加。结论:孕期饮用酒精对子代大鼠的神经损伤可能与cdk5蛋白表达的上调有关。     

神经干细胞移植对AD模型大鼠SNAP-25表达的影响

目的：观察神经干细胞对AD大鼠海马周围微环境中SNAP-25 表达及其认知功能的影响。方法：取成年雄性Wistar大鼠30 只,随机分为对照组、AD模型组、细胞移植组,每组10 只。采用凝聚态Abeta1-42 注射到大鼠海马组织内建立阿尔茨海默病(AD)大 鼠动物模型,通过Y 迷宫测试大鼠学习记忆能力和Western blot技术检测大鼠海马组织内SNAP-25 的表达。结果：Y 迷宫测试结 果显示术后4 周时AD模型组和细胞移植组大鼠学习记忆均低于对照组,与AD模型组比较,细胞移植组大鼠学习记忆能力明显 高于AD模型组,差异有统计学意义（P＜ 0.05）;Western blot 检测结果显示术后4 周时AD模型组和细胞移植组大鼠海马组织内 SNAP-25 蛋白表达量均低于对照组,与AD 模型组比较,细胞移植组大鼠海马组织SNAP-25 蛋白表达量高于AD 模型组差异有 统计学意义（P＜0.05）。结论：移植的NSCs 可改善AD 大鼠的学习和记忆能力,其机制可能是通过改变海马区周围的微环境并上 调了海马组织内SNAP-25 表达。     

慢性间断性低氧大鼠认知功能和脑胆碱能神经元的进行性变化

目的：探讨慢性间断性低氧（CIH）大鼠认知功能的进行性变化及其与脑胆碱能神经元变化的关系。方法：成年雄性SD大鼠40只,随机均分为对照组、慢性间断性低氧1,3,5周组。应用Morris水迷宫检测认知功能的变化;利用HE染色在光镜下计数前额叶皮层和海马坏死神经元数;利用免疫组化方法检测前额叶皮层和海马胆碱乙酰转移酶（ChAT）阳性表达。结果：CIH各组大鼠学习记忆能力呈进行性下降趋势;与对照组比较,CIH5w组出现明显学习记忆功能障碍（P〈0.05）。CIH各组前额叶皮层和海马变性坏死神经元数增多,且随低氧时间延长,上述改变呈慢性进行性加重趋势。CIH各组前额叶皮层和海马ChAT阳性表达逐渐下降;与对照组比较,CIH3w组和CIH5w组前额叶皮层和海马ChAT阳性表达明显减少,差异具有显著性（P〈0.05）。结论：慢性间断性低氧大鼠认知功能进行性下降与前额叶皮层和海马神经元病理性损伤、ChAT表达进行性减少有关。     

突触素、神经肽Y(NPY)在糖尿病模型大鼠脑组织细胞中的表达研究

对突触素(synaptophysin)、神经肽Y(NPY)在链尿佐菌素诱导的糖尿病模型大鼠额叶皮质和海马组织细胞中的表达进行研究,并利用UTHSCSA Image Tools 3.0进行图象分析,同时对其与学习记忆的关系进行探讨.选取成年Sprague-Dawley雄性大鼠20只,体重200-300g,随机分为两组.实验组用链尿佐菌素诱导产生糖尿病模型,并以血糖测定和尿糖水平测定进行筛选,另一组为空白对照组.继续饲养4周后,各组大鼠先进行Y型迷宫测试其学习记忆能力,然后取出脑组织,制做连续冰冻切片,对大脑额叶皮质和海马组织进行突触素、神经肽Y酶标免疫组织化学染色,观察这些蛋白在糖尿病大鼠和正常大鼠脑中表达的差异.结果发现糖尿病大鼠在Y型迷宫测试中,错误次数明显增多,糖尿病大鼠额叶皮质和海马神经元数目较正常对照组明显减少,神经细胞内突触素和神经肽Y的表达均较正常对照组明显下降.我们的研究显示突触素和神经肽Y在糖尿病大鼠大脑额叶皮质和海马组织内表达的减少可能与糖尿病组神经细胞突触数目及突触的可塑性下降、学习和记忆能力障碍有关.这可能是造成糖尿病性痴呆的一个因素.     

α7nAChR和nNOS在Aβ诱导的认知障碍大鼠皮质及海马表达的时间和空间变化

本研究旨在观察α7烟碱型乙酰胆碱受体(α7 nicotinic acetylcholine receptor,α7n ACh R)与神经元型一氧化氮合酶(neuronal nitric oxide synthetase,n NOS)在Aβ诱导的认知障碍大鼠皮质和海马时间和空间的分布与变化。取Sprague-Dawley(SD)大鼠60只,随机分成6组,其中3个实验组分别经侧脑室注射凝聚态Aβ1-42(2.5μg/μL,4μL),连续观察7 d(7 d Aβ组)、14 d(14 d Aβ组)和21 d(21 d Aβ组);3个对照组则分别注射和实验组等量生理盐水并观察相同的时间。用Y迷宫刺激器检测大鼠的学习和记忆行为能力,用免疫组织化学和Western blot检测皮质和海马CA1、CA3、DG各区α7n ACh R和n NOS阳性细胞分布和蛋白表达量的变化。结果显示,与各自对照组相比,3个实验组大鼠的学习和记忆行为能力降低,前额叶皮质和海马各区α7n ACh R和n NOS的表达均显著下调,特别在前额叶皮质浅层和海马CA3区变化明显;3个实验组之间比较结果显示,Aβ诱导的认知障碍大鼠学习和记忆功能、前额叶皮质和海马α7n ACh R和n NOS表达均随着Aβ作用时间的延长呈进行性下降。以上结果提示,前额叶皮质和海马α7n ACh R和n NOS表达的共同降低可能是Aβ诱导的大鼠认知功能障碍的基础。     

竹节参对AD大鼠海马区Drd-2及GFAP、TNF-α表达的影响

探讨竹节参对AD大鼠海马区Drd-2及TNF-α、GFAP表达的影响。60只SPF级SD雄性大鼠,适应性喂养一周后,随机分为6组。除假手术组海马注射生理盐水外,其余5组均注射Aβ1-42以复制AD模型。然后对假手术组及模型组大鼠予以生理盐水灌胃,西药组大鼠予以脑复康悬浮液灌胃,竹节参高、中、低剂量组大鼠分别予以相应浓度竹节参水煎液灌胃,持续4周。完成水迷宫实验后,处死大鼠,取大鼠海马,切片、Western Blotting法检测各组大鼠海马Drd-2、GFAP和TNF-α表达量的变化。Western blotting法观察各组大鼠海马GFAP、TNF-α的表达水平,模型组较假手术组明显升高,各治疗组明显低于模型组,且竹节参高剂量组低于西药组。Drd-2的表达水平,模型组较假手术组明显降低,各治疗组明显高于模型组,且竹节参高剂量组要高于西药组。竹节参能通过提高AD大鼠海马形胶质细胞Drd-2活性,抑制炎症反应。     

Tuning of electronic properties of one-dimensional cyano-bridged Cu-Ni, Cu-Pd, and Cu-Pt bimetallic assemblies by stereochemistry of ligands

Preparations, XPS and electronic spectroscopy, and magnetism of seven new one-dimensional cyano-bridged coordination polymers, chiral [Cu(RR-chxn)₂][Pd(CN)₄] · 2H₂O (1), [Cu(trans-chxn)₂][M(CN)₄] · 2H₂O (2, 4, and 6 for M = Pd, Ni, and Pt), and [Cu(cis-chxn)₂][M(CN)₄] · 2H₂O (3, 5, and 7 for M = Pd, Ni, and Pt) (RR-chxn = cyclohexane-(1R,2R)-diamine, trans-chxn = racemic trans-cyclohexane-(1,2)-diamine, and cis-chxn = racemic cis-cyclohexane-(1,2)-diamine) have been reported in view of tuning of their electronic properties by stereochemistry of chxn ligands and metal-substitution. Comparison of Cu 2p_1/2 and 2p_3/2 peaks of XPS and broad d-d bands around 18 000 cm⁻¹ of electronic spectra are described systematically for 1-7. Variable-temperature magnetic measurement shows that complexes 1-7 indicate weak antiferromagnetic interactions via cyano-bridges. Because of semi-coordination coupled with pseudo Jahn-Teller elongation and electrostatic interaction for 1, the axial Cu-N coordination bond distances of 2.330(7) and 3.092(8) Å are considerably longer than those of equatorial ones in the range from 2.016(6) to 2.030(6) Å. The former bond distances of 1 are intermediate values among the related Ni (2.324(6) and 3.120(8) Å) and Pt (2.34(1) and 3.09(1) Å) complexes.     

多马胺能药物对鲇鱼促性腺激素（GtH）分泌活动的影响

以珠江流域鲇鱼（silurus asotus)为实验材料,研究了多巴胺（DA）能药物（DA及其D－2型受体拮抗物 ,DOM）对鲇鱼促性腺激素（GtH)释放的影响,结果表明,在性腺发育的各个时期,单独注射DOM（5ug/g)均不能显著提高鲇鱼血液基础GtH水平,当DOM与LHRH－A联合注射时能显著增强LHRH－A刺激GtH释放的作用;DA只能抑制GnRH诱导的GtH释放,对基础GtH释放无抑制作用,这种生殖内分泌调节方式与鲇形目的革胡子鲇（Clarias gariepinus)和大鳍Hu（Mystus macropterus)相似,而与鲤形目的鲁科（Cyrpindiae)鱼类不同。     

Influence of Fluoride on Rat Kidney Antioxidant System: Effects of Methionine and Vitamin E

The aim of the study has been to determine and compare the influence upon the kidney antioxidative system, exercised by administration of vitamin E, and vitamin E in combination with methionine, under conditions of oxidative stress induced by sodium fluoride. The experiment was carried out on Wistar FL rats (adult males) that, for 35 days, were administered water, NaF, NaF with vitamin E, or vitamin E with methionine (doses: 10 mg NaF/kg of body mass/24 h, 3 mg vitamin E per 10 μl per rat for 24 h, 2 mg methionine per rat for 24 h). The influence of administered sodium fluoride and antioxidants upon the antioxidative system in kidney was examined by analyzing the concentration of malondialdehyde (MDA) and the activity of the most important antioxidative enzymes (SOD, total and both its isoenzymes, GPX, GST, GR, and CAT). The studies carried out confirmed the disadvantageous effect of the administered dose of NaF upon the antixodiative system in rats (increase in the concentration MDA, decrease activity of all antioxidative enzymes). The administration of vitamin E increased the activity of studied enzymes with the exception of glutathione reductase GR; it also reduced the procesess of lipid peroxidation. It has been found that combined doses of vitamin E and methionine were most effective in inhibiting lipid peroxidation processes. The results confirmed the antioxidative properties of methionine.     

Reorientation of Microfibrils and Microtubules at the Outer Epidermal Wall of Maize Coleoptiles During Auxin-Mediated Growth

Auxin-mediated elongation growth of isolated subapical coleoptile segments of maize (Zea mays L.) is controlled by the extensibility of the outer cell wall of the outer epidermis (Kutschera et al., 1987). Here we investigate the hypothesis that auxin controls the extensibility of this wall by changing the orientation of newly deposited microfibrils through a corresponding change in the orientation of cortical microtubules. On the basis of electron micrographs it is shown that cessation of growth after removal of the endogenous source of auxin is correlated with a relative increase of longitudinally orientated microfibrils and microtubules at the inner wall surface. Conversely, reinduction of growth by exogenous auxin is correlated with a relative increase of transversely orientated microfibrils and microtubules at the inner wall surface. These changes can be detected 30–60 min after the removal and addition of auxin, respectively. The functional significance of directional changes of newly desposited wall microfibrils for the control of elongation growth is discussed.     

Combination of dihydromyricetin and ondansetron strengthens antiproliferative efficiency of adriamycin in K562/ADR through downregulation of SORCIN: A new strategy of inhibiting P-glycoprotein

Though the advancement of chemotherapy drugs alleviates the progress of cancer, long-term therapy with anticancer agents gradually leads to acquired multidrug resistance (MDR), which limits the survival outcomes in patients. It was shown that dihydromyricetin (DMY) could partly reverse MDR by suppressing P-glycoprotein (P-gp) and soluble resistance-related calcium-binding protein (SORCIN) independently. To reverse MDR more effectively, a new strategy was raised, that is, circumventing MDR by the coadministration of DMY and ondansetron (OND), a common antiemetic drug, during cancer chemotherapy. Meanwhile, the interior relation between P-gp and SORCIN was also revealed. The combination of DMY and OND strongly enhanced antiproliferative efficiency of adriamycin (ADR) because of the increasing accumulation of ADR in K562/ADR-resistant cell line. DMY could downregulate the expression of SORCIN and P-gp via the ERK/Akt pathways, whereas OND could not. In addition, it was proved that SORCIN suppressed ERK and Akt to inhibit P-gp by the silence of SORCIN, however, not vice versa. Finally, the combination of DMY, OND, and ADR led to G2/M cell cycle arrest and apoptosis via resuming P53 function and restraining relevant proteins expression. These fundamental findings provided a promising approach for further treatment of MDR.     

Structure and function of S-adenosylhomocysteine hydrolase

In mammals, S-adenosylhomocysteine hydrolase (AdoHcyase) is the only known enzyme to catalyze the breakdown of S-adenosylhomocysteine (AdoHcy) to homocysteine and adenosine. AdoHcy is the product of all adenosylmethionine (AdoMet)-dependent biological transmethylations. These reactions have a wide range of products, and are common in all facets of biometabolism. As a product inhibitor, elevated levels of AdoHcy suppress AdoMet-dependent transmethylations. Thus, AdoHcyase is a regulator of biological transmethylation in general. The three-dimensional structure of AdoHcyase complexed with reduced nicotinamide adenine dinucleotide phosphate (NADH) and the inhibitor (1′R, 2′S, 3′R)-9-(2′,3′-dihyroxycyclopenten-1-yl)adenine (DHCeA) was solved by a combination of the crystallographic direct methods program, SnB, to determine the selenium atom substructure and by treating the multiwavelength anomalous diffraction data as a special case of multiple isomorphous replacement. The enzyme architecture resembles that observed for NAD-dependent dehydrogenases, with the catalytic domain and the cofactor binding domain each containing a modified Rossmann fold. The two domains form a deep active site cleft containing the cofactor and bound inhibitor molecule. A comparison of the inhibitor complex of the human enzyme and the structure of the rat enzyme, solved without inhibitor, suggests that a 17° rigid body movement of the catalytic domain occurs upon inhibitor/substrate binding.     

Evolution of different oligomeric glycyl-tRNA synthetases

There are two oligomeric types of glycyl-tRNA synthetases (GlyRSs) in genome, the alpha2beta2 tetramer and alpha2 dimer. Here, we showed that the anticodon-binding domains (ABDs) of dimeric and tetrameric GlyRSs are non-homologous, although their catalytic central domains (CCDs) are homologous. The dimeric GlyRS_ABD is fused to the C-terminal of CCD in alpha-subunit, but the tetrameric GlyRS_ABD is to the C-terminal in beta-subunit during evolution. Generally, one species only contains one oligomeric type of GlyRS, but the both oligomeric GlyRSs with the multiple homologous domains can be observed in Magnetospirillum magnetotacticum genome, nevertheless, these homologous domains are probably from different genomes.     

In vitro studies of the rabbit immune system. IV. Differential mitogen responses of isolated T and B cells.

The mitogenic responses of separated rabbit lymphocyte populations functionally analogous to mouse T and B cells have been tested in vitro. Purified T cells were prepared by passage over nylon wool (NW) and purified B cells prepared by treatment with antithymocyte serum and complement (ATS + C). ATS + C kills 70% of peripheral blood lymphocytes (PBL's) and 50% of the spleen cells while passage over NW yields 40% of the applied PBL's and 5–23% of the applied spleen cells. NW-purified T cells from the spleen or PBL's respond fully to concanavalin A (Con A) but have a reduced response to phytohemaglutinin (PHA) and little or no response to goat anti-rabbit immunoglobulin (anti-Ig). PBL's that survive ATS + C (B cells) are stimulated by anti-Ig but not by Con A or PHA. B cells purified from spleen do not respond to Con A or PHA but will respond to anti-Ig under appropriate conditions. A full spleen B-cell response to anti-Ig required removal of Ig produced by the cultures that blocked anti-Ig stimulation. It is concluded that, for rabbit lymphocytes, Con A and PHA are primarily T-cell mitogens and that anti-Ig is primarily a B-cell mitogen. However, the mitogen response of unfractionated PBL or spleen cell populations indicates an overlap in reactivity. This could be due to cells sharing T and B properties, alteration of cell populations by the fractionation procedures used, or recruitment of one population in the presence of a mitogenic response of the other population.     

Plasmodium berghei: lack of antimalarial activity of an analogue of folate precursor, 2,4-diamino-6-hydroxymethylpteridine in a mouse model

It was earlier hypothesized that the malarial parasite may convert precursors of folate analogues to synthesize de novo inhibitors toxic to itself, but not to the mammalian cell. It was suggested that one such analogue, 2,4-diamino-6-hydroxymethylpteridine (DAP) may be converted to aminopterin (AMP), a known dihydrofolate reductase inhibitor. In the present study, we evaluated the ability of DAP to inhibit proliferation of Plasmodium berghei NK65 in mice, with(out) folinic acid rescue. Cumulative dosages of DAP ranging from 0.1 to 20 mg/kg bw. administered either orally or intraperitoneally showed no suppression of parasite growth, or gave mild activities that were not statistically significant (P > 0.05). Our findings do not seem to support the hypothesis of selective de novo metabolism of DAP to AMP by the malarial parasite.     

围隔藻类水华演替过程中二甲基硫化物的含量动态

于2005年6月至7月,研究了海洋围隔不同藻类水华演替过程中二甲基硫化物的含量动态,并考察了相关环境参数对二甲基硫化物含量的影响。2个围隔实验组均出现未知藻水华-硅藻水华-甲藻水华的演替过程,这3次不同藻类水华分别对应了二甲基硫化物含量的3次高峰,表明藻类水华对二甲基硫化物含量有重要贡献。不同藻类水华的贡献有较大差异,甲藻水华的贡献最大,硅藻次之,未知藻类水华的贡献最小。实验结果还表明PO4^3-、NO2^-和NH4^＋主要通过影响藻类生长状态,进而影响DMSP和DMSO的含量;NO2^-和NH4^＋亦可能通过调节DMSP和DMSO在藻细胞内的生理功能,影响DMSP和DMSO的含量;PO4^3-、NO2^-和NH4^＋与DMS含量无显著相关。