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原子吸收分光光度法分析污泥样品中金属元素四种消化方法的比较

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环境科学研究 1984年第3期 17-22页

作者： Thomas H.chr.stensen Lissi R.Pedersen jens chr.tjell 杜振海

引言将污泥施用于农田时,测定污泥中重金属元素的含量是有重要意义的。文献报导中金属元素的测定大多采用原子吸收分光光度法。但在分析测定前污泥样品的消化有好几种方法。这些方法主要是干灰化、王水、硝酸和随后使用的两种或多种酸,... 详细信息

引言将污泥施用于农田时,测定污泥中重金属元素的含量是有重要意义的。文献报导中金属元素的测定大多采用原子吸收分光光度法。但在分析测定前污泥样品的消化有好几种方法。这些方法主要是干灰化、王水、硝酸和随后使用的两种或多种酸,或者是氧化剂的消解法。由于消化时浓度、温度、压力和时间不同。

关键词：污泥样消化方法干灰化法消解法重金属浓度有机物分解浓度水平消化法文献报导厌氧

Models of Cancer Growth Revisited

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Applied Mathematics 2018年第4期9卷 418-447页

作者： jens chr.stian Larsen Vanlø se Alle 50 2. mf. tv 2720 Vanl&oslash se Copenhagen Denmark

In the present paper we study models of cancer growth, initiated in jens chr. Larsen: Models of cancer growth [1]. We consider a cancer model in variables C cancer cells, growth factors GFi?,i= 1,,p, (oncogene, tumor suppressor gene or carcinogen) and growth inhibitor GFi?,i= 1,,p, (cells of the immune system or chemo or immune therapy). For q =1 this says, that cancer grows if (1) below holds and is eliminated if the reverse inequality holds. We shall prove formulas analogous to (1) below for arbitrary p, q∈N, p ≥ q . In the present paper, we propose to apply personalized treatment using the simple model presented in the introduction.

关键词： Cancer Mass Action Kinetic System Immunity

Dietary supplementation of Bacillus subtilis influenced intestinal health of weaned pigs experimentally infected with a pathogenic E. coli

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Journal of Animal Science and Biotechnology 2019年第4期10卷 969-980页

作者： Kwangwook Kim Yijie He Xia Xiong Amy Ehrlich Xunde Li Helen Raybould Edward R.Atwill Elizabeth A.Maga jens JΦrgensen Yanhong Liu Department of Animal Science University of CaliforniaDavisCA 95616USA School of Veterinary Medicine University of CaliforniaDavisCA 95616USA chr.Hansen A/S HoersholmDenmark

Background: There is growing evidence to support the beneficial effects of supplementing direct-fed microbials(DFM) on performance, health status, and immune responses of weaned pigs. Therefore, the objective of this study was to investigate dietary supplementation of Bacillus subtilis(DSM 25841) on growth performance, diarrhea, gut permeability and immunity of weaned pigs experimentally infected with a pathogenic F-18 Escherichia coli(E. coli).Results: The F18 E. coli infection reduced(P < 0.05) growth performance and intestinal villi height, whereas increased(P < 0.05) diarrhea and transcellular and paracellular permeability in the jejunum compared with non-challenged control. Supplementation of Bacillus subtilis linearly enhanced average daily gain of E. coli infected pigs from d 0 to 5 post-inoculation(PI)(P < 0.05) and d 0 to 11 PI(P = 0.058). Supplementation of high dose of Bacillus subtilis reduced(P < 0.05) both transcellular and paracellular permeability on d 5 and d11 PI compared with the E. coli infected pigs fed with control diet. E. coli infection up-regulated(P < 0.05)the m RNA expression of SLC5 A10(soluble carrier family 5 member 10) and MUC2(mucin 2) on d 5 PI, but down-regulated(P < 0.05) expression of SLC5 A10, MUC2, and CLDN1 on d 11 PI in jejunal mucosa when pigs were fed with the control diet. Supplementation of Bacillus subtilis linearly up-regulated(P < 0.05) the m RNA expression of CFTR and ZO1 on d 5 PI and SLC5 A10 and MUC2 on d 11 PI in jejunal mucosa of E. coli infected pigs. In addition, E. coli infection increased(P < 0.05) the m RNA expression of several immune genes(IL1 A, IL1 B, and IL7 on d 5 PI, and IL1 B, IL6, IL7, and TNF on d 11 PI) in the ileal mucosa of weaned pigs. Inclusion of Bacillus subtilis to control diet linearly down-regulated gene expression of IL1 A on d 5 PI(P = 0.07) and IL6 on d 11 PI(P < 0.05) in ileal mucosa of E. coli infected ***: Supplementation of Bacillus subtilis(DSM 25841) enhanced growth r

关键词： Bacillus subtilis Growth rate Gut barrier function Intestinal inflammation Pathogenic Escherichia coli Weaned pigs

Feeding Bacillus-based probiotics to gestating and lactating sows is an efficient method for improving immunity,gut functional status and biofilm formation by probiotic bacteria in piglets at weaning

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Animal Nutrition 2023年第2期13卷 361-372页

作者： PawełKonieczka Karolina Ferenc jens NJørgensen Lea HBHansen Romuald Zabielski Jarosław Olszewski Zdzisław Gajewski Magdalena Mazur-Kusnirek Dominika Szkopek Natalia Szyrynska Krzysztof Lipinski Department of Poultry Science University of Warmia and Mazury in OlsztynOlsztynPoland Department of Animal Nutrition The Kielanowski Institute of Animal Physiology and Nutrition Polish Academy of SciencesJabłonnaPoland Center for Translational Medicine Warsaw University of Life SciencesWarszawaPoland chr.Hansen A/S Animal Health and NutritionHoersholmDenmark Department of Animal Nutrition and Feed Science University of Warmia and Mazury in OlsztynOlsztynPoland Department of Histology and Embryology Faculty of Veterinary MedicineUniversity of Warmia and Mazury in OlsztynOlsztynPoland

The effects of dietary probiotic supplementation with viable Bacillus subtilis and Bacillus amyloliquefaciens spores on sow performance,immunity,gut functional status and biofilm formation by probiotic bacteria in piglets at weaning were ***-six sows reared in a continuous farrowing system for one full cycle were fed gestation diets during the first 90 d of pregnancy and lactation diets until the end of *** sows were fed a basal diet without probiotics(control;n=48)or a diet supplemented with viable spores(1.1×10^(9)CFU/kg of feed)(probiotic;n=48).At 7 d of age,sucking piglets(n=12/group)were provided prestarter creep feed until weaning at 28 d of *** piglets in the probiotic group were supplemented with the same probiotic and dosage as their *** and colostrum collected from sows and ileal tissues collected from piglets on the day of weaning were used for *** increased the weight of piglets(P=0.077),improved the weaning weight(P=0.039)and increased both the total creep feed consumption(P=0.027)and litter gain(P=0.011).Probiotics also improved the faecal score in the second(P=0.013)week of *** immunoglobulin G(IgG)concentrations in sow blood at farrowing and the IgM concentrations in piglet blood at weaning were higher in the probiotic group than in the control group(P=0.046).The piglets from the probiotic-treated sows showed a higher IgM concentration in the ileal mucosa(P=0.050)and a lower IgG concentration in the ileal mucosa(P=0.021)compared with the piglets from control *** probiotic-treated piglets had a thicker ileal mucosa(P=0.012)due to the presence of longer villi and larger Peyer's patches(P<0.001).*** and *** were detected in the probiotic-treated piglets but not the control piglets;these bacteria were present in the digesta and villus structures and formed structures resembling ***,Bacillus-based probiotic supplementation improves the health indices of sows

关键词： Probiotic Gut function Immune status Biofilm Piglet Sow