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排序方式: 共有72条查询结果,搜索用时 109 毫秒
1.
2.
Dagmar Waberski Anke Döhring Florencia Ardón Nadine Ritter Holm Zerbe Hans-Joachim Schuberth Marion Hewicker-Trautwein Karl Fritz Weitze Ronald HF Hunter 《Acta veterinaria Scandinavica》2006,48(1):13-8
Whole boar semen or seminal plasma has been demonstrated to advance the time of ovulation in gilts. As a means of clarifying
this influence, the contribution of uterine lymphatics and their white cell populations has been examined. After duct visualisation
with Evan's blue, lymph was sampled from a mesometrial vessel in eight pre-ovulatory gilts whose uterine lumen was infused
simultaneously with whole semen in one ligated horn and saline in the contralateral ligated horn. Lymph was collected from
cannulated vessels for periods of up to four hours under general anaesthesia. Thereafter, mesometrial lymph nodes, utero-tubal
junction and uterine wall tissues were sampled. The proportion of nucleated cells in the sampled lymph increased towards the
end of the collection period, but erythrocytes were found in all instances preventing a meaningful differentiation and identification
of leukocytes. Prominent uterine lymph nodes were present in the mesometrium on both sides of the reproductive tract in 7
of 10 gilts. Differences in cellular contents were demonstrated between the side of the tract infused with semen and that
infused with saline control. Two of 4 gilts had lower values for CD4 (Cluster Differentiation) and 3 of 6 gilts higher values
for MHC II (Major Histocompatibility Complex) markers on the side challenged with semen. In contrast, values remained constant
for CD8 but ranged widely for CD18. Immunohistochemical analysis of uterine tissue samples for MHC II+ cells revealed significant
differences (P < 0.05) between the control and semen-treated ligated portions of the horns, as well as between the tissue
sample of uterine wall and that from the utero-tubal junction, but there were no significant differences for CD4+ cells. It
therefore remains plausible that semen-induced cytokines in the uterine lymph undergo counter-current transfer to the ipsilateral
ovary and accelerate the final maturation of pre-ovulatory Graafian follicles. 相似文献
3.
Engineering bacterial thiosulfate and tetrathionate sensors for detecting gut inflammation 下载免费PDF全文
Kristina N‐M Daeffler Jeffrey D Galley Ravi U Sheth Laura C Ortiz‐Velez Christopher O Bibb Noah F Shroyer Robert A Britton Jeffrey J Tabor 《Molecular systems biology》2017,13(4)
There is a groundswell of interest in using genetically engineered sensor bacteria to study gut microbiota pathways, and diagnose or treat associated diseases. Here, we computationally identify the first biological thiosulfate sensor and an improved tetrathionate sensor, both two‐component systems from marine Shewanella species, and validate them in laboratory Escherichia coli. Then, we port these sensors into a gut‐adapted probiotic E. coli strain, and develop a method based upon oral gavage and flow cytometry of colon and fecal samples to demonstrate that colon inflammation (colitis) activates the thiosulfate sensor in mice harboring native gut microbiota. Our thiosulfate sensor may have applications in bacterial diagnostics or therapeutics. Finally, our approach can be replicated for a wide range of bacterial sensors and should thus enable a new class of minimally invasive studies of gut microbiota pathways. 相似文献
4.
H. Xiong C. Li E. Garami Y. Wang M. Ramjeesingh K. Galley C.E. Bear 《The Journal of membrane biology》1999,167(3):215-221
ClC-2 belongs to a large family of chloride channels and its expression in certain cell types is associated with the appearance
of swelling-activated chloride (Cl−) currents. In the present report, we examined the hypothesis that ClC-2 plays a role in regulatory volume decrease by expressing
ClC-2 in Sf9 cells using the baculovirus system. First, we showed that ClC-2 protein expression is associated with appearance
of a Cl− conductance which is activated by hypo-osmotic shock and can be distinguished from swelling-activated chloride currents endogenous
to Sf9 cells on the basis of its pharmacology and specific inhibition by an anti-ClC-2 antibody. Second, we show that the
rate of regulatory volume decrease is significantly enhanced in Sf9 cells expressing ClC-2 protein. Hence, our data support
the hypothesis that ClC-2 is capable of mediating regulatory volume decrease.
Received: 12 August/Revised: 23 October 1998 相似文献
5.
6.
G Galley H Stalder A Goergler MC Hoener RD Norcross 《Bioorganic & medicinal chemistry letters》2012,22(16):5244-5248
A series of imidazole compounds has been identified which affords potent and selective partial and full agonists of the TAAR1 receptor. Starting from 2-benzyl-imidazoline screening hits, a series of structurally related 2-benzyl- and 4-benzyl-imidazoles was investigated first, but it proved highly challenging to obtain compounds having sufficient selectivity against the adrenergic alpha 2 receptor. This issue could be successfully addressed by modification of the linker region and SAR exploration led to the discovery of highly selective isopropyl-substituted 4-aminomethyl-imidazole compounds. The work culminated in the identification of the selective TAAR1 partial agonist RO5073012 (4-chlorophenyl)-(1H-imidazol-4-ylmethyl)-isopropyl-amine, 24), which has a good pharmacokinetic profile after oral administration in rodents. RO5073012 has been found to be active in a behavioural rat model which is considered indicative for schizophrenia. 相似文献
7.
Yeast killer plasmid mutations affecting toxin secretion and activity and toxin immunity function. 总被引:21,自引:5,他引:16 下载免费PDF全文
M double-stranded RNA (MdsRNA) plasmid mutants were obtained by mutagenesis and screening of a diploid killer culture partially heat cured of the plasmid, so that a high proportion of the cells could be expected to have only on M plasmid. Mutants with neutral (nonkiller [K-], immune [R+]) or suicide (killer [K+], sensitive [R-] phenotypes were examined. All mutants became K- R- sensitives on heat curing of the MdsRNA plasmid, and showed cytoplasmic inheritance by random spore analysis. In some cases, M plasmid mutations were indicated by altered mobility of the MdsRNA by agarose gel electrophoresis or by altered size of in vitro translation products from denatured dsRNA. Neutral mutants were of two types: nonsecretors of the toxin protein or secretors of an inactive toxin. Of three neutral nonsecretors examined, one (NLP-1), probably a nonsense mutation, made a smaller protoxin precursor in vitro and in vivo, and two made full-size protoxin molecules. The in vivo protoxin of 43,000 molecular weight was unstable in the wild type and kinetically showed a precursor-product relationship to the processed, secreted 11,000-molecular-weight toxin. In one nonsecretor (N1), the protoxin appeared more stable in a pulse-chase experiment, and could be altered in a recognition site required for protein processing. 相似文献
8.
A method of monitoring slow rotational motions of proteins from the decay of the intrinsic phosphorescence is described. The phosphorescence is excited with a 10-μsec pulse of vertically polarized light from an air gap lamp, and the anisotropy was computed as a function of time from the simultaneously detected vertically and horizontally polarized components of the emission. The approach is illustrated with time-dependent measurements of the anisotropy of the tryptophan phosphorescence of Staphylococcus aureus nuclease, bovine carbonic anhydrase, and liver alcohol dehydrogenase in glycerol-phosphate buffer between ?90 and ?70°C. The temperature- and molecular-weight dependence of the exponential decays in the anisotropy indicate that overall rotation of the proteins is at the origin of the depolarization. The potential of the approach as a probe of the slow rotational motions of proteins in membranes and other macromolecular complexes is stressed. 相似文献
9.
Hoffmann T Bös M Stadler H Schnider P Hunkeler W Godel T Galley G Ballard TM Higgins GA Poli SM Sleight AJ 《Bioorganic & medicinal chemistry letters》2006,16(5):1362-1365
The discovery of a novel, achiral pyridine class of potent and orally active neurokinin-1 (NK(1)) receptor antagonists is described. The evaluation of this class is briefly outlined, leading to the identification of netupitant 21 and befetupitant 29, two new proprietary chemical entities with high affinity and excellent CNS penetration. 相似文献
10.
Dr AR Holmes RD Cannon HF Jenkinson 《Journal of industrial microbiology & biotechnology》1995,15(3):208-213
The yeastCandida albicans coaggregates with a variety of streptococcal species, an interaction that may promote oral colonization by yeast cells.C. albicans andCandida tropicalis are the yeasts most frequently isolated from the human oral cavity and our data demonstrate that both these species bind toStreptococcus gordonii NCTC 7869 while two otherCandida species (Candida krusei andCandida kefyr) do not. Adherence ofC. albicans was greatest when the yeast had been grown at 30° C to mid-exponential growth phase. For 21 strains ofC. albicans there was a positive correlation between the ability to adhere toS. gordonii and adherence to experimental salivary pellicle. Whole saliva either stimulated or slightly inhibited adherence ofC. albicans toS. gordonii depending on the streptococcal growth conditions. The results suggest that the major salivary adhesins and coaggregation adhesins ofC. albicans are co-expressed. 相似文献