Calcium phosphate ceramics, such as tricalcium phosphate (TCP) and hydroxyapatite (HA) are commonly used as bone substitutes. These materials have different physical and chemical properties and, therefore, display different interactions with the host tissue. Factors such as porosity,osteoconductivity,and biocompatibility seem to become increasingly important in the development of new artificial bone replacement materials. This article focuses on the relationship between the physical and chemical properties of calcium phosphate ceramics and the host tissue.

BACKGROUND: Drug-controlled release preparation by drugs or other active substances combined with carriers, has been an important development trend in field of pharmacy. However different characteristics of controlled release drug carrier materials leas to different drug release behaviors, so recent researches focus on a new type of drug carrier material to obtain the satisfactory drug release. OBJECTIVE: To introduce some drug carrier materials, and analyze those materials' characteristics and their application on drug controlled-release. RETRIEVAL STRATEGY: A computer-based search was undertaken on China Journal Full-text Database from January 1998 to June 2007, with the Keywords of "polymeric hydrogel, polylactic acid, chitosan, silk fibroin, drug controlled-release, drug carrier" and language was limited to Chinese. Inclusion criteria: ①preparations and characteristics of various drug carrier materials;②drug controlled release of various drug carrier materials. Exclusion criteria: outdated literatures. LITERATURE EVALUATION: Eighty-six related articles were screened out, and 28 of them met the criteria, including 10 were reviews and others were clinical or basic experiments. DATA SYNTHESIS: ① At present, the materials applied for drug carrier include polymeric hydrogel, polylactic acid/poly(lactic-co-glycolic acid), chitosan and their derivates, silk fibroin and so on.②Intellectual polymeric hydrogel can respond swelling and contraction for the stimulation of temperature, acidity, pressure and light, etc. And the specific environment sensitiveness enlarges its application in drug delivery system.③Polylactic acid and poly(lactic-co-glycolic acid), as a kind of biodegradable polymer materials, represent biocompatibility, biodegradability and non-toxic degradation products. As for controlled release drug carrier material, it can influence drug release by modulating degradation of polylactic acid, so as to increase drug efficacy.④Chitosan is satisfactory in adsorbability, film forming ability and permeability. Water-soluble chitosan with low relative molecular mass is prone to degrade and difficult to accumulate, so chitosan nanoparticles or chitosan microspheres as carriers for drug delivery system have been the hot topic of recent researches.⑤Native polymer material silk fibroin is non-toxic and non-stimulative, shows good physical, chemical and biological characteristics, as well as satisfactory histocompatibility. The pH value responsibility and zymohydrolysis are also observed when loading and releasing drugs. Chemical modification and addition of other compounds will increase the characteristics and the drug-controlled release of silk fibroin. CONCLUSION: Various drug carrier materials show good biocompatibility, biodegradability, physicochemical and biological stability, extremely low toxicity, and high drug loading property. But the material's performance should be synthesized and modified in practical application to satisfy various preparations of drug-controlled release by specific performance and structure.

Polypeptide and protein microspheres can elevate drug availability, but drug devitalization and drug fast release can result in side effects during microsphere preparation. Fast release in the body is a burning question facting investigators who studying microsphere controlled release system. Relative molecular mass, concentration, structure and drug content of the polyme can greatly affect drug fast release. Fast release can be controlled by structural modification, using additives, controlling particl diameter of microspheres and decreasing drug content.

Objective: To study the impact of basic medical insurance on household consumption. Methods: According to the panel data of the east, central and west regions from 2002 to 2011, time and entity fixed effect model (Two-way FE) is established to test the relationship between the basic medical insurance and household consumption. Results: The basic medical insurance has significant positive effects on consumption, the consumption increased 10%, 16% and 19% in regions of East, Middle and West, respectively. Conclusion: The construction and improvement of the social medical insurance system improve the growth of the consumption, and the government should enhance the security, and consider the regional differences at the same time.

Objective To investigate the effect of pretreatment with penehychidine hydrochloride(PHCD) on NF-κB activity in the lung tissue following acute lung injury(ALI)induced by hemorrhagic shock in rats.Methods Twenty-four Wistar rats of both sexes weighing 200-250 g were randomly divided into 3 groups (n=8 each):group Ⅰ sham operation (group S);group Ⅱ ALI and group Ⅲ PHCD.The animals were anesthetized with intraperitoneal chloral hydrate 350 mg/kg.Hemorrhagic shock was produced in group Ⅱ and Ⅲ.Right carotid artery was cannulated for BP monitoring.Left femoral artery was cannulated for blood letting.MAP was reduced to 35-45 mm Hg within 10 min and maintained for 1 h in group ALI and PHCD(group Ⅱ andⅢ).The animals were then resuscitated with blood and normal saline.PHCD 2 mg/kg was given iv immediately before blood-letting in group PHCD.Blood samples were obtained from artery at 6 h after hemorrhagic shock wag induced for blood gas analysis and from right auricle for determination of plasma TNF-α concentration by ELISA.The lungs were then harvested for microscopic examination and determination of the expression of NF-κB p65 by immuno-histochemistry and W/D lung weight ratio.Results The plasma TNF-α concentration and expression of NF-κB p65 in the lung tissue were significantly increased in group ALI and PHCD as compared with group S and were significantly lower in group PHCD than in group ALI.There was less damage to the lung tissue in group PHCD than in group ALI.Conclusion PHCD pretreatment can attenuate ALl induced by hemorrhagic shock by inhibiting NF-κB activity.

BACKGROUND: Local application of sustained-release antimicrobials serve as an adjuvant therapy of periodontitis, and the dosage form, medicine and carrier material have greatly developed. OBJECTIVE: To summarize the currant situation and progression of periodontal local sustained-release antimicrobials at home and abroad.METHODS: A computer-based online search of CNKI and Pubmed (1999-01/2009-10) was performed for the related articles about sustained-ralease antimicrobials, with the key words "periodontitis, treatment, medication, and sustained-ralease". The articles in the same field published recently or in authoritative journals were selected. A total of 143 articles were collected, and 40 related sustained-ralease antimicrobials were included.RESULTS AND CONCLUSION: Application of sustained-release antimicrobials is a well adjuvant therapy for some special clinical periodontitis. It is widely used due to its low dosage, long lasting-time and well target effect. The clinical application of sustained-ralease antimicrobials is promising along with the development of compound medicine and periodontal tissue regeneration.

OBJECTIVE: To discuss advances in intrahepatic and intrabiliary stent application and evaluate their biocompatibility.METHODS: A computer-based online search of CNKI between 1989 and 2009 was performed to search related articles with the keywords of "bile duct, hepatic duct, stent, treatment". A total of 51 articles were searched and 20 were included according to inclusion and exclusion criteria. The articles were summarized from aspects of treatment advances in intrahepatic and intrabiliary stent application and prevention of obstruction following intrahepatic and intrabiliary stenting; the clinical application of intrahepatic and intrabiliary stent, biocompatibility and prevention of stent obstruction were discussed.RESULTS: Intrabiliary stent mainly includes metal stent and plastic stent. The metal stent is superior over plastic stent in preventing bacteria and keeping stent patency, but its cost is large. The plastic stent is easy for bacteria attachment and stent obstruction, but it is simple to change the stent and the cost is low. Intrabiliary stent implantation is the best method to treat malignant obstruction of bile duct with few complications. Intrahepatic stent in combination with various radiotherapies can prolong effective patent time of the stent and effectively prevent stent obstruction. CONCLUSION: Intrabiliary stent implantation is the most effective clinical method to treat malignant obstruction of bile duct.However, the biocompatibility of various intrabiliary stents should be improved. Intrahepatic stent in combination with radiotherapies can prevent stent obstruction.

Breast Feeding ; Enteral Nutrition ; Epigenesis, Genetic ; Humans ; Infant ; Infant Formula ; Infant Nutritional Physiological Phenomena ; Infant, Low Birth Weight ; growth & development ; Infant, Newborn ; Infant, Premature ; growth & development ; Infant, Premature, Diseases ; prevention & control ; Nutrition Assessment ; Nutritional Status

Guidelines as Topic ; Humans ; Infant, Low Birth Weight ; Infant, Newborn ; Infant, Premature ; Nutritional Physiological Phenomena

This paper introduces the wavelet transform with multiresolution for liver cancer CT image enhancement. As the wavelet transform with compact support, orthogonality and approximately symmetry, SymletsA (sym4) wavelet family is applied to the two-layer multiscale decompose of the CT image. The decomposed wavelet coefficients are processed with the threshold values of 550, 350 and 250, with the low -frequency region intensified and the high-frequency one weakened. Then the image is reconstructed and thus the image is enhanced. Wavelet transform proves efficient in CT image enhancement.