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121.
Deok-Gyu Kim Jae-Hwan Park Jae-Lip Kim Bong-Kwang Jung Sarah Jiyoun Jeon Hyemi Lim Mi Youn Lee Eun-Hee Shin Terry A. Klein Heung-Chul Kim Sung-Tae Chong Jin-Won Song Luck-Ju Baek Jong-Yil Chai 《The Korean journal of parasitology》2015,53(1):135-139
A total of 1,708 small mammals (1,617 rodents and 91 soricomorphs), including Apodemus agrarius (n = 1,400), Microtus fortis (167), Crocidura lasiura (91), Mus musculus (32), Myodes (= Eothenomys) regulus (9), Micromys minutus (6), and Tscherskia (= Cricetulus) triton (3), were live-trapped at US/Republic of Korea (ROK) military training sites near the demilitarized zone (DMZ) of Paju, Pocheon, and Yeoncheon, Gyeonggi Province from December 2004 to December 2009. Small mammals were examined for their intestinal nematodes by necropsy. A total of 1,617 rodents (100%) and 91 (100%) soricomorphs were infected with at least 1 nematode species, including Nippostrongylus brasiliensis, Heligmosomoides polygyrus, Syphacia obvelata, Heterakis spumosa, Protospirura muris, Capillaria spp., Trichuris muris, Rictularia affinis, and an unidentified species. N. brasiliensis was the most common species infecting small mammals (1,060; 62.1%) followed by H. polygyrus (617; 36.1%), S. obvelata (370; 21.7%), H. spumosa (314; 18.4%), P. muris (123; 7.2%), and Capillaria spp. (59; 3.5%). Low infection rates (0.1-0.8%) were observed for T. muris, R. affinis, and an unidentified species. The number of recovered worms was highest for N. brasiliensis (21,623 worms; mean 20.4 worms/infected specimen) followed by S. obvelata (9,235; 25.0 worms), H. polygyrus (4,122; 6.7 worms), and H. spumosa (1,160; 3.7 worms). A. agrarius demonstrated the highest prevalence for N. brasiliensis (70.9%), followed by M. minutus (50.0%), T. triton (33.3%), M. fortis (28.1%), M. musculus (15.6%), C. lasiura (13.2%), and M. regulus (0%). This is the first report of nematode infections in small mammals captured near the DMZ in ROK. 相似文献
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125.
Hyo-Soon Jeong Seung Hoon Lee Hye-Young Yun Kwang Jin Baek Nyoun Soo Kwon Kyoung-Chan Park Dong-Seok Kim 《Journal of biomedical science》2011,18(1):55
Background
Sphingosylphosphorylcholine (SPC) acts as a potent lipid mediator and signaling molecule in various cell types. In the present study, we investigated the effects of SPC on melanogenesis and SPC-modulated signaling pathways related to melanin synthesis. 相似文献126.
Acharya A Baek ST Banfi S Eskiocak B Tallquist MD 《Genesis (New York, N.Y. : 2000)》2011,49(11):870-877
Tcf21 is a Class II bHLH family member with essential roles in the formation of the lungs, kidneys, gonads, spleen, and heart. Here, we report the utility of a mouse line with targeted insertion of a tamoxifen-inducible Cre recombinase, MerCreMer at the Tcf21 locus. This mouse line will permit the inducible expression of Cre recombinase in Tcf21-expressing cells. Using ROSA26 reporter mice, we show that Cre recombinase is specifically and robustly activated in multiple Tcf21-expressing tissues during embryonic and postnatal development. The expression profile in the kidney is particularly dynamic with the ability to cause recombination in mesangial cells at one time of induction and podocytes at another time. These features make the Tcf21-driven inducible Cre line (Tcf21(iCre) ) a valuable genetic tool for spatiotemporal gene function analysis and lineage tracing of cells in the heart, kidney, cranial muscle, and gonads. 相似文献
127.
Treatment of chronic bacterial infections, such as tuberculosis (TB), requires a remarkably long course of therapy, despite the availability of drugs that are rapidly bacteriocidal in vitro. This observation has long been attributed to the presence of bacterial populations in the host that are "drug-tolerant" because of their slow replication and low rate of metabolism. However, both the physiologic state of these hypothetical drug-tolerant populations and the bacterial pathways that regulate growth and metabolism in vivo remain obscure. Here we demonstrate that diverse growth-limiting stresses trigger a common signal transduction pathway in Mycobacterium tuberculosis that leads to the induction of triglyceride synthesis. This pathway plays a causal role in reducing growth and antibiotic efficacy by redirecting cellular carbon fluxes away from the tricarboxylic acid cycle. Mutants in which this metabolic switch is disrupted are unable to arrest their growth in response to stress and remain sensitive to antibiotics during infection. Thus, this regulatory pathway contributes to antibiotic tolerance in vivo, and its modulation may represent a novel strategy for accelerating TB treatment. 相似文献
128.
Corynebacterium ammoniagenes N424 was metabolically modified to isolate overproducers of deoxycytidine. Inosine auxotrophy (ino) was initially introduced
to prevent the flow of PRPP (phosphoribosyl pyrophosphate) into the purine biosynthetic pathway by random mutagenesis using
N-methyl-N′-nitro-N-nitrosoguanidine. Following that, mutants possessing hydroxyurea resistance (HUr) were isolated to increase the activity of ribonucleoside diphosphate reductase, which catalyzes the reduction of ribonucleoside
diphosphate to deoxyribonucleoside diphosphate. Then, in order to block the flow of dCTP into the TMP biosynthetic pathway
via dUTP, thymine auxotrophy (thy−) was introduced into the mutant IH30 with ino− and Hlf. The resulting mutant IM7, possessing the characteristics of ino−, HUr, and thy−, was deficient in dCTP deaminase and produced significantly higher amounts of deoxycytidine (81.3 mg/L) compared to its mother
strain IH30 (6.2 mg/L). Deoxycytidine productivity was further enhanced by isolating the mutant IU19, which was resistant
to 5-fluorouracil, an inhibitor of carbamoyl phosphate synthase. This enzyme catalyzed the synthesis of carbamoyl phosphate
from glutamine, HCO3−, and ATP. 5-Fluorouracil also inhibited aspartate trans-carbamoylase, catalyzeing the condensation of carbamoyl phosphate
and aspartate. Finally, 5-fluorocytosine resistance (FCr) was introduced into the mutant strain IU19 to relieve the repression caused by accumulation of pyrimidine nucleosides. The
mutant strain IC14-C6 possessing all the five characteristics described above produced 226.3 mg/L of deoxycytidine, which
was at least 2,000 fold higher compared to the wild type, and accumulated only a negligible amount of other pyrimidines under
shake flask fermentation. 相似文献
129.
Hong SB Kim DH Lee M Baek SY Kwon SW Samson RA 《Journal of microbiology (Seoul, Korea)》2011,49(4):669-674
Eurotium strains were isolated from 77 loaves of meju (dried fermented soybeans), in various regions of Korea from 2008 to 2010. Morphological
characteristics and DNA sequences of β-tubulin were examined. They were identified as Eurotium amstelodami, E. chevalieri, E. herbariorum, E. repens, E. rubrum, and E. tonophilum. Of these species, E. chevalieri and E. tonophilum had not been previously reported in association with meju. E. chevalieri and E. repens were the species isolated most frequently. This paper summarizes the morphological characteristics of six Eurotium species and provides key to identify the species from meju. 相似文献
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