Simplest method for creating micropatterned nanostructures on PDMS with UV light.

The fabrication of micropatterned structures on PDMS is a critical step in soft lithography, microfluidics, and many other PDMS-based applications. To substitute traditional mold-casting methods, we develop a simple method to create micropatterned nanostructures on PDMS in one step. After exposing a flat PDMS surface to a UV pen lamp through a photomask (such as a TEM grid), micropatterned nanostructures can be formed readily on the PDMS surface. We also demonstrate that fabricated PDMS can be used for the microcontact printing of protein immunoglobulin (IgG) on solid surfaces. This method is probably the simplest method of creating micropatterned nanostructures on PDMS reported so far because it does not need casting, surface coating, or chemical reagents. Only a UV pen lamp and a photomask are required, and this method can be performed under ambient conditions without vacuum. We expect that this method will greatly benefit researchers who use PDMS regularly in various applications such as soft lithography and microfluidics.

Brief report: emerging services for children with autism spectrum disorders in Hong Kong (1960-2004).

Early identification of autistic features in any child is important because there is potential for improvement by means of interventional, educational, or rehabilitative programs. Appropriate diagnosis of autism requires a dual-level approach--routine developmental surveillance and screening, and diagnosis and evaluation of autism. The historical emergence of a model of services for children with autism in Hong Kong arose because of increasing awareness, increasing prevalence, and pressure from parents and support groups. The university-based Autism Research Program at the University of Hong Kong serves as an example of an integrated center for research, teaching, and training in autism. The period from 1960 to 2004 is reviewed.

Epidemiological study of autism spectrum disorder in China.

The object of this study was to investigate the epidemiologic pattern of autism spectrum disorder in Chinese children. An autism spectrum disorder registry has been established in Hong Kong since 1986 by collecting data in a single center (the only university-affiliated child assessment center in Hong Kong). Since 1997, inpatient data from all public hospitals under the Hospital Authority have been stored in a central computerized program and retrieved from the Clinical Data Analysis and Reporting System. Clinical data have also been retrieved through the Clinical Data Analysis and Reporting System to ensure the completion of the registry, and these suspected cases have undergone the same diagnostic evaluation for autism spectrum disorder, as some of the new autism cases might be hospitalized in the public hospital. The incidence and prevalence of autism spectrum disorder have been calculated for the period of 1986 to 2005 using the population statistics available in the government for children less than 15 years old in Hong Kong. This study has included 4 247 206 person-years from 1986 to 2005 for children less than 15 years old and 1 174 322 person-years for those less than 5 years old in Hong Kong. Altogether, 645 children 0 to 4 years old with diagnoses of autism spectrum disorder were identified from 1986 to 2005. The estimated incidence of autism spectrum disorder was 5.49 per 10 000. The prevalence was 16.1 per 10 000 for children less than 15 years old for the same period. The male to female ratio was 6.58:1. This is the first reported epidemiologic study of autism spectrum disorder in Chinese children. The incidence rate is similar to those reported in Australia and North America and is lower than Europeans.

Cerebral palsy: correlation of risk factors and functional performance using the Functional Independence Measure for Children (WeeFIM).

We studied the risk factors affecting the functional status of cerebral palsy. A cross-sectional study of 73 children with cerebral palsy was conducted with the Functional Independence Measure for Children (WeeFIM), which assesses functional skills in the domains of self-care, mobility, and cognition. The mean total Functional Independence Measure for Children quotient was 67.5%. The mean subquotients for self-care, mobility, and cognition were 68.3%, 62.7%, and 69.4%, respectively. The risk factors related to the degree of functional dependency were (1) mental retardation (P = .030), (2) epilepsy (P = .005), (3) type of cerebral palsy (P < .001), and (4) severity of cerebral palsy using the Gross Motor Function Classification System (P < .001) (using univariate analysis). However, when using multivariate analysis, only epilepsy (P = .02) and severity status according to the Gross Motor Function Classification System (P < .001) were significantly related. When the etiology was analyzed, only prematurity was significantly associated with better Functional Independence Measure for Children scores using both univariate (P = .022) and multivariate (P = .007) analyses. The functional status of children with cerebral palsy depends on the severity and the presence of epilepsy. Despite impairment, we found that most children with cerebral palsy could achieve functional independence.