An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
... Compared with the use of monocultures in the field, cultivation of medicinal herbs in forests is an effective strategy to alleviate disease. Chemical interactions between herbs and trees play an important role in disease suppression in forests. We evaluated the ability of leachates from needles of Pinus armandii to induce resistance in Panax notoginseng leaves, identified the components via gas ch ...
... Solar desalination is an environment-friendly and sustainable technology to address the shortage of freshwater resources. However, it still faces huge challenges to develop a salt-rejection solar desalination system with continuous high efficiency. Herein, an electrospun nanofiber mat was fabricated for continuously high-efficiency solar desalination with carbon nanotube as a photothermal material ...
... Twelve new A,D-seco-limonoids, clauemargines A–L (1–12), and three known analogues were isolated from the stems of Clausena emarginata. The absolute configurations of 1 and 5 were confirmed by X-ray crystallography and ECD spectroscopy, respectively. Compounds 1, 2, 8–10, and 13 showed moderate inhibitory effects on LPS-induced NO production (IC₅₀ values < 10 μM). ...
Armadillidium vulgare; Nematoda; X-ray diffraction; cycloaddition reactions; esterification; glycerol; mass spectrometry; models; nuclear magnetic resonance spectroscopy; solid state culture
Abstract:
... The solid-state cultivation of Acaulium sp. H-JQSF isolated from Armadillidium vulgare produces acautalides A–C (1–3) as skeletally unprecedented Diels–Alder adducts of a 14-membered macrodiolide to an octadeca-9,11,13-trienoic acid. The acautalide structures, along with the intramolecular transesterifications of 1-acylglycerols, were elucidated by mass spectrometry, nuclear magnetic resonance, ch ...
3-hydroxybutyric acid; Penicillium; agarose; ammonium sulfate; carbon; chromatography; culture media; enzyme activity; filtration; mass spectrometry; metal ions; molecular weight; mutagenesis; mutants; pH; polyacrylamide gel electrophoresis; temperature
Abstract:
... Penicillium sp. DS9713a-01 was obtained by ultraviolet (u.v.) light mutagenesis from the Penicillium sp. DS9713a which can degrade poly (3-hydroxybutyrate) (PHB). The enzymatic activity of DS9713a-01 was 97% higher than that of the wild-type strain. The DS9713a-01 mutant could completely degrade PHB films in 5 days; however, the wild-type strain achieved only 61% at the same time. The extracellula ...
RNA-directed DNA polymerase; Scurrula; Tecoma stans; anti-inflammatory activity; freeze drying; gene expression; herbal medicines; inflammation; interleukin-10; interleukin-6; lipopolysaccharides; macrophages; prostaglandin synthase; protein synthesis; rheumatoid arthritis; shrubs; stroke; traditional medicine; tumor necrosis factor-alpha; China; Malaysia
Abstract:
... Scurrula ferruginea (Jack) Danser (locally known as ‘Dedalu’ or ‘dian nan ji sheng’ in Malaysia and China) is a hemi-parasitic shrub that is widely used as herbal medicine to treat inflammation, rheumatism, and stroke. However, the scientific basis of its anti-inflammatory function and mechanism remain to be proven.Aim of the study: To evaluate the anti-inflammatory activity as well as the prelimi ...
... Cultivation of medicinal crops, which synthesize hundreds of substances for curative functions, was focused on the synthesis of secondary metabolites rather than biomass accumulation. Nutrition is an important restrict factor for plant growth and secondary metabolites, but little attention has been given to the plasticity of nutrient uptake and secondary metabolites synthesis response to soil nitr ...
... As a highly toxic and widely used chemical, phosgene has become a serious threat to humankind and public security because of its potential use by terrorists and unexpected release during industrial accidents. For this reason, it is an urgent need to develop facile, fast, and selective detection methods of phosgene. In this Article, we have constructed a highly selective fluorescent sensor o-Pab fo ...
XiaHong, et al. ; He Meng; Wang Xiaolan; Wang Zhenggang; Chen Lingyun; Lu Yao; Zhang Xinjiang; Li Mei; Liu Zhongming; Zhang Yu; Zhang Lina; Show all 11 Authors
... Biodegradable plastics are urgently needed in the biomedical field to avoid the secondary surgery for implants after completing the repair of nonload bearing bone defects. Herein, novel chitin based plastics were successfully fabricated by changing the shape and aggregation state structure of chitin hydrogels through drying under a negative pressure, which led to a plastic deformation. The chitin ...
antineoplastic agents; drug design; human cell lines; inhibitory concentration 50; iron oxides; irradiation; light; magnetic fields; nanoparticles; nanospheres; neoplasms; pH; photosensitivity; porphyrins
Abstract:
... The synthesis and characterization of carboxyl-functionalized superparamagnetic iron oxide nanoparticles (SPION)-attached cationic porphyrins with different positive charges (porphyrin@SPION) are described as pH-sensitive, multifunctional photosensitization. These nanospheres exhibit excellent targeted cell accumulation under external magnetic field and outstanding cell photocytotoxicity in weak a ...
... Diallyl disulfide (DADS) has been shown to cause G2/M phase cell cycle arrest in several human cancers. Here we demonstrate a mechanism by which DADS induces G2/M phase arrest in BGC823 human gastric cancer cells via Chk1. From cell cycle gene array results, we next confirmed that cyclin B1 expression was decreased by DADS, while the expression of p21, GADD45α and p53 were increased. Despite the l ...
... A reliable and inexpensive pretreatment procedure in the determination of β2-agonists in pork was developped. The procedure used a nanocomposite of multiwalled carbon nanotubes (CNTs) functionalized with graphene (rGO) as the reversed dispersive sorbent. It was analyzed after purification by high-performance liquid chromatography, the extraction time and the properties of the nanocomposite were op ...
... Silica nanorods were synthesized through a simple one-pot emulsion-droplet-based growth method, in which tetraethylorthosilicate (TEOS) was used as the silica source, ammonia as the catalyst, and polyvinylpyrrolidone (PVP) as the structure-directing agent and stabilizer. By controlling hydrolysis and condensation in the reaction process, we regulated the aspect ratios and the infrared (IR) absorpt ...
ascorbic acid; biomass; deficit irrigation; field capacity; fruit quality; fruiting; fruits; irrigation management; leaves; potassium; titratable acidity; tomatoes
Abstract:
... A pot experiment was conducted to investigate the effect of potassium (K) fertilization on tomato quality, plant K uptake, water and K use efficiency (WUE and KUE) under deficit irrigation regime. During fruit development stage of the first cluster of fruit, irrigation regimes were comprised of three levels, i.e. 80–90% field capacity (θf) (W1), 70–80% θf (W2) and 60–70% θf (W3); and K fertilizati ...
XiaHong, et al. ; Jingfeng Song; Zhiyong Xiao; Bo Chen; Spencer Prockish; Xuegang Chen; Anil Rajapitamahuni; Le Zhang; Jinsong Huang; Show all 9 Authors
films (materials); gold; indium tin oxide; microscopy; screening
Abstract:
... We report a more than 10-fold enhancement of the piezoelectric coefficient d₃₃ of polycrystalline CH₃NH₃PbI₃ (MAPbI₃) films when interfacing them with ferroelectric PbZr₀.₂Ti₀.₈O₃ (PZT). Piezoresponse force microscopy (PFM) studies reveal d33MAPbI3 values of 0.3–0.4 pm/V for MAPbI₃ deposited on Au, indium tin oxide, and SrTiO₃ surfaces, with small phase angle fluctuating at length scales smaller t ...
... A facile approach to synthesize 3D SnO₂/nitrogen-doped graphene aerogels (SNGA) was developed. By using ethylenediamine (EDA) as nitrogen source, combined with hydrothermal-induced reduction and self-assembly, the reduction of graphene oxide (GO) to graphene, the uniform in situ deposition of SnO₂ nano-particles on graphene, the nitrogen-doping of graphene, and the self-assembly of graphene to 3D ...
... Maidong (Ophiopogon japonicus) is a perennial evergreen plant of the Asparagaceae, occurring mainly in China, Japan, Vietnam, and India. It grows in the damp places on the hillside below 2,000 m above sea level, under the forest or beside the stream. It has been widely cultivated in Sichuan Province of China for medicinal uses, and it is included in the Chinese pharmacopoeia. During April 2019, ma ...
... Yunmuxiang (Aucklandia lappa) is a tall, perennial herbaceous plant in the Compositae family, occurring mainly in Asia and Europe. Yunmuxiang originated in India and was introduced into China in approximately 1940. Since then, it has been widely cultivated in the southwest region of China for medicinal uses; it is included in the Chinese pharmacopoeia. Yunmuxiang is used primarily as a sedative, i ...
absorption; antigens; blood serum; detection limit; early diagnosis; fluorescence; nanorods
Abstract:
... The level of carcinoembryonic antigen (CEA) in serum has the significant reference value for early diagnosis and treatment of various cancers. However, the CEA detection still suffers from the issue of limited sensitivity and reliability. Herein, a fluorescence (FL)-infrared absorption (IRA) dual-mode nanoprobe was fabricated based on carbon dots (CDs)@SiO₂ nanorod for CEA detection. The FL and IR ...
... Chitin exists abundantly in crab and shrimp shells as the template of the minerals, which inspired us to mineralize it for fabricating bone grafting materials. In the present work, chitin nanofibrous microspheres were used as the matrix for in situ synthesis of hydroxyapatite (HA) crystals including microflakes, submicron-needles, and submicron-spheres, which were penetrated by long chitin nanofib ...